MAX15062 [ETC]
60V、300mA、超小尺寸、高效、 同步降压型DC-DC转换器;
| 型号： | MAX15062 |
| 厂家： | 
ETC |
| 描述： | 60V、300mA、超小尺寸、高效、 同步降压型DC-DC转换器 转换器 DC-DC转换器 |
| 文件： | 总46页 (文件大小：8946K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-6685; Rev 1; 10/13
备 有 评 估 板
MAX15062
60V、300mA、超小尺寸、高效、
-
同步降压型DC DC转换器
优势和特性
●ꢀ 无需外部元件，降低总体成本
概述
-
MAX15062高效、高压、同步降压型DC DC转换器内置
MOSFET，工作在4.5V至60V输入电压范围。转换器提供
高达300mA的输出电流，输出电压为3.3Vꢀ(MAX15062A) ꢀ
5Vꢀ(MAX15062B)和可调输出电压(MAX15062C)。器件工ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
•ꢀ 无需肖特基同步整流即可保持高效、低成本工作
•ꢀ 内置补偿
•ꢀ 3.3V和5V固定输出电压，内置反馈分压器
•ꢀ 内部软启动
-
°
°
作在 40 C至+125 C温度范围，采用紧凑的8引脚(2mmꢀ
xꢀ2mm)ꢀTDFN封装。提供仿真模式。
•ꢀ 全陶瓷电容设计，提供紧凑布局
器件采用峰值电流模式架构，带有MODE引脚，可用于在
脉宽调制(PWM)或脉冲频率调制(PFM)模式下控制器件工
作。PWM工作模式在任何负载条件下都保持固定频率工
作，在对开关频率变化敏感的应用中非常有用。PFM工作
模式消除了负向电感电流以及轻载条件下额外的跳脉冲，
以提高效率。低导通电阻片上MOSFET确保满载时保持高
效，同时也简化了PCB布局。
●ꢀ 缩减DC-DC稳压器库存清单ꢀ
•ꢀ 4.5V至60V宽输入电压范围ꢀ
•ꢀ 3.3V和5V固定输出电压
ꢀ
•ꢀ 可调0.9V至0.89ꢀ×ꢀVIN输出电压选项ꢀ
•ꢀ 提供高达300mA电流
ꢀ
•ꢀ 可配置PFM和强制PWM工作模式
●ꢀ 降低功耗ꢀ
•ꢀ 效率高达92%ꢀ
为降低输入浪涌电流，器件提供内部固定软启动。器件也
具有EN/UVLO引脚，允许用户在输入电压达到相应要求时
开启器件。RESET开漏引脚可以用作输出电压监测。
•ꢀ PFM功能，轻载时保持高效ꢀ
•ꢀ 关断电流仅为2.2μAꢀ(典型值)
●ꢀ 在恶劣工业环境下工作可靠ꢀ
•ꢀ 打嗝式限流和自动重试启动
应用
●ꢀ 过程控制
●ꢀ 工业传感器
ꢀ
ꢀ
•ꢀ 内置输出电压监测，带有RESET开漏引脚
•ꢀ 可编程EN/UVLO门限ꢀ
●ꢀ 4–20mA电流环ꢀ
●ꢀ HVAC与楼宇控制
●ꢀ 替代高压LDO
●ꢀ 通用负载点电源
•ꢀ 启动时单调进入预偏置输出ꢀ
•ꢀ 过热保护ꢀ
•ꢀ -40°C至+125°C汽车级/工业级温度范围
典型工作电路
L1
33µH
V
V
OUT
IN
3.3V,
4.5V TO
60V
V
LX
IN
C
IN
300mA
C
OUT
1µF
10µF
EN/UVLO
GND
定购信息和在数据资料的最后给出。
MAX15062A
相关型号以及配合该器件使用的推荐产品，请参见：china.maximintegrated.
com/MAX15062.related。
V
RESET
CC
C
VCC
1µF
V
MODE
OUT
本文是英文数据资料的译文，文中可能存在翻译上的不准确或错误。如需进一步确认，请在您的设计中参考英文资料。
有关价格、供货及订购信息，请联络Maxim亚洲销售中心：10800ꢀ852ꢀ1249ꢀ(北中国区)，10800ꢀ152ꢀ1249ꢀ(南中国区)，
或访问Maxim的中文网站：china.maximintegrated.com。
OperatingꢀTemperatureꢀRange
......................... -40°Cꢀtoꢀ+125°C
JunctionꢀTemperature......................................................+150°C
MODEꢀtoꢀGND.............................................-0.3VꢀtoꢀV ꢀ+ꢀ0.3V
LXꢀtotalꢀRMSꢀCurrentꢀ.....................................................±800mA
OutputꢀShort-CircuitꢀDurationꢀ....................................Continuous
V
ꢀtoꢀGND
..............................................................-0.3Vꢀtoꢀ70V
EN/UVLOꢀtoꢀGND....................................................-0.3Vꢀtoꢀ70V
LXꢀtoꢀGNDꢀ....................................................-0.3VꢀtoꢀV ꢀ+ꢀ0.3V
ContinuousꢀPowerꢀDissipationꢀ(T ꢀ=ꢀ+70°C)ꢀ
8-PinꢀTDFNꢀ(derateꢀ6.2mW/NCꢀaboveꢀ+70°C)ꢀ...........496mW
MAX15062
60V、300mA、超小尺寸、高效、
-
同步降压型DC DC转换器
Absolute Maximum Ratings
IN
A
IN
V
,ꢀFB/V
,ꢀRESETꢀtoꢀGND................................-0.3Vꢀtoꢀ6V
CC
OUT
StorageꢀTemperatureꢀRangeꢀ............................ -65°Cꢀtoꢀ+150°C
SolderingꢀTemperatureꢀ(reflow)ꢀ.......................................+260°C
LeadꢀTemperatureꢀ(soldering,ꢀ10s)ꢀ.................................+300°C
CC
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these
or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect
device reliability.
(Note 1)
Package Thermal Characteristics
TDFNꢀ
Junction-to-AmbientꢀThermalꢀResistanceꢀ(θ )ꢀ......+162°C/Wꢀ
JA
Junction-to-CaseꢀThermalꢀResistanceꢀ(θ )ꢀ.............+20°C/W
JC
Note 1:ꢀ PackageꢀthermalꢀresistancesꢀwereꢀobtainedꢀusingꢀtheꢀmethodꢀdescribedꢀinꢀJEDECꢀspecificationꢀJESD51-7,ꢀusingꢀaꢀfour-layerꢀ
board.ꢀForꢀdetailedꢀinformationꢀonꢀpackageꢀthermalꢀconsiderations,ꢀreferꢀtoꢀwww.maximintegrated.com/thermal-tutorial.
Electrical Characteristics
(V ꢀ=ꢀ24V,ꢀV
ꢀ=ꢀ0V,ꢀC ꢀ=ꢀC
ꢀ=ꢀ1µF,ꢀV
ꢀ=ꢀ1.5V,ꢀLXꢀ=ꢀMODEꢀ=ꢀRESETꢀ=ꢀunconnected;ꢀT ꢀ=ꢀT ꢀ=ꢀ-40°Cꢀtoꢀ+125°C,ꢀunlessꢀ
EN/UVLO A J
IN
GND
IN
VCC
otherwiseꢀnoted.ꢀTypicalꢀvaluesꢀareꢀatꢀT ꢀ=ꢀ+25°C.ꢀAllꢀvoltagesꢀareꢀreferencedꢀtoꢀGND,ꢀunlessꢀotherwiseꢀnoted.)ꢀ(Noteꢀ2)
A
PARAMETER
INPUT SUPPLY (VIN)
InputꢀVoltageꢀRange
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
V
4.5
60
4
V
IN
InputꢀShutdownꢀCurrent
I
V
ꢀ=ꢀ0V,ꢀshutdownꢀmode
2.2
95
µA
IN-SH
EN/UVLO
MODEꢀ=ꢀunconnected,ꢀ
FB/V ꢀ=ꢀ1.03ꢀxꢀFB/V
I
160
4
µA
Q-PFM
InputꢀSupplyꢀCurrent
OUT
OUT-REG
I
Normalꢀswitchingꢀmode,ꢀV ꢀ=ꢀ24V
2.5
mA
Q-PWM
IN
ENABLE/UVLO (EN/UVLO)
V
V
V
ꢀrising
1.19
1.06
1.215
1.09
0.75
1.24
1.15
ENR
EN/UVLO
EN/UVLOꢀThreshold
V
ꢀfalling
V
ENF
EN/UVLO
V
V
ꢀfalling,ꢀtrueꢀshutdown
EN-TRUESD EN/UVLO
EN/UVLOꢀInputꢀLeakageꢀCurrent
I
V
ꢀ=ꢀ60V,ꢀT =ꢀ+25°C
-100
+100
nA
EN/UVLO
EN/UVLO
Aꢀ
LDO (V
)
CC
V
V
V
ꢀOutputꢀVoltageꢀRange
ꢀCurrentꢀLimit
V
6Vꢀ<ꢀV ꢀ<ꢀ60V,ꢀ0mAꢀ<ꢀI ꢀ<ꢀ10mA
VCC
4.75
13
5
5.25
50
V
mA
V
CC
CC
CC
CC
IN
I
V
V
V
V
ꢀ=ꢀ4.3V,ꢀV =ꢀ12V
30
VCC-MAX
CC
INꢀ
ꢀDropout
V
=ꢀ4.5V,ꢀI =ꢀ5mA
VCCꢀ
0.15
4.18
3.8
0.3
CC-DO
INꢀ
CC
CC
V
ꢀrising
ꢀfalling
4.05
3.7
4.3
CC-UVR
V
ꢀUVLO
V
CC
V
3.95
CC-UVF
Maxim Integrated
ꢀ ꢀ 2
MAX15062
60V、300mA、超小尺寸、高效、
-
同步降压型DC DC转换器
Electrical Characteristics (continued)
(V ꢀ=ꢀ24V,ꢀV
ꢀ=ꢀ0V,ꢀC ꢀ=ꢀC
ꢀ=ꢀ1µF,ꢀV
ꢀ=ꢀ1.5V,ꢀLXꢀ=ꢀMODEꢀ=ꢀRESETꢀ=ꢀunconnected;ꢀT ꢀ=ꢀT ꢀ=ꢀ-40°Cꢀtoꢀ+125°C,ꢀunlessꢀ
IN
GND
IN
VCC
EN/UVLO A J
otherwiseꢀnoted.ꢀTypicalꢀvaluesꢀareꢀatꢀT ꢀ=ꢀ+25°C.ꢀAllꢀvoltagesꢀareꢀreferencedꢀtoꢀGND,ꢀunlessꢀotherwiseꢀnoted.)ꢀ(Noteꢀ2)
A
PARAMETER
POWER MOSFETs
SYMBOL
CONDITIONS
MIN
TYP
1.35
0.45
MAX
UNITS
T ꢀ=ꢀ+25°C
1.75
2.7
A
I
ꢀ=ꢀ0.3Aꢀ
LX
High-SideꢀpMOSꢀOn-Resistance
R
Ω
DS-ONH
(sourcing)
T ꢀ=ꢀT ꢀ=ꢀ+125°Cꢀ
A
J
T ꢀ=ꢀ+25°C
0.55
0.9
A
I
ꢀ=ꢀ0.3Aꢀ
LX
Low-SideꢀnMOSꢀOn-Resistance
LXꢀLeakageꢀCurrent
R
Ω
DS-ONL
(sinking)
T ꢀ=ꢀT ꢀ=ꢀ+125°C
A
J
V
V
=ꢀ0V,ꢀV =ꢀ60V,ꢀT ꢀ=ꢀ+25°C,
INꢀ A
EN/UVLOꢀ
I
-1
+1
µA
LX-LKG
ꢀ=ꢀ(V
ꢀ+ꢀ1V)ꢀtoꢀ(V ꢀ-ꢀ1V)
LX
GND
IN
SOFT-START (SS)
Soft-StartꢀTime
t
4.1
ms
SS
FEEDBACK (FB)
MODEꢀ=ꢀGND,ꢀMAX15062C
MODEꢀ=ꢀunconnected,ꢀMAX15062C
MAX15062C
0.887
0.887
-100
0.9
0.915
-25
0.913
0.936
FBꢀRegulationꢀVoltage
V
V
FB-REG
FBꢀLeakageꢀCurrent
I
nA
FB
OUTPUT VOLTAGE (V
)
OUT
MODEꢀ=ꢀGND,ꢀMAX15062A
3.25
3.25
4.93
4.93
3.3
3.35
5
3.35
3.42
5.07
5.18
MODEꢀ=ꢀunconnected,ꢀMAX15062A
MODEꢀ=ꢀGND,ꢀMAX15062B
V
ꢀRegulationꢀVoltage
V
V
OUT
OUT-REG
MODEꢀ=ꢀunconnected,ꢀMAX15062B
5.08
CURRENT LIMIT
PeakꢀCurrent-LimitꢀThreshold
I
0.49
0.58
0.25
0.56
0.66
0.62
0.73
0.35
A
A
PEAK-LIMIT
I
RUNAWAY-
LIMIT
RunawayꢀCurrent-LimitꢀThreshold
MODEꢀ=ꢀGND
0.3
A
mA
A
NegativeꢀCurrent-LimitꢀThreshold
I
SINK-LIMIT
0.01
0.13
PFMꢀCurrentꢀLevel
TIMING
I
PFM
SwitchingꢀFrequency
f
465
500
1
535
kHz
SW
EventsꢀtoꢀHiccupꢀAfterꢀCrossingꢀ
RunawayꢀCurrentꢀLimit
Cycles
FB/V
toꢀCauseꢀHiccup
ꢀUndervoltageꢀTripꢀLevelꢀ
OUT
62.5
64.5
66.5
%
HiccupꢀTimeout
131
90
ms
ns
%
MinimumꢀOn-Time
MaximumꢀDutyꢀCycle
t
130
94
ON-MIN
D
FB/V
ꢀ=ꢀ0.98ꢀxꢀFB/V
OUT-REG
89
91.5
MAX
OUT
Maxim Integrated
ꢀ ꢀ 3
MAX15062
60V、300mA、超小尺寸、高效、
-
同步降压型DC DC转换器
Electrical Characteristics (continued)
(V ꢀ=ꢀ24V,ꢀV
ꢀ=ꢀ0V,ꢀC ꢀ=ꢀC
ꢀ=ꢀ1µF,ꢀV
ꢀ=ꢀ1.5V,ꢀLXꢀ=ꢀMODEꢀ=ꢀRESETꢀ=ꢀunconnected;ꢀT ꢀ=ꢀT ꢀ=ꢀ-40°Cꢀtoꢀ+125°C,ꢀunlessꢀ
IN
GND
IN
VCC
EN/UVLO A J
otherwiseꢀnoted.ꢀTypicalꢀvaluesꢀareꢀatꢀT ꢀ=ꢀ+25°C.ꢀAllꢀvoltagesꢀareꢀreferencedꢀtoꢀGND,ꢀunlessꢀotherwiseꢀnoted.)ꢀ(Noteꢀ2)
A
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
RESET
V
ꢀThresholdꢀforꢀRESETꢀRising V
V
V
ꢀrising
ꢀfalling
94
95.5
92
2
97
%
%
OUT
OUT-OKR
OUT-OKF
OUT
V
ꢀThresholdꢀforꢀRESETꢀ
OUT
V
90.5
93.5
OUT
Falling
RESETꢀDelayꢀAfterꢀV
Reachesꢀ95%ꢀRegulation
ꢀ
OUT
ms
RESETꢀOutputꢀLevelꢀLow
RESETꢀOutputꢀLeakageꢀCurrent
MODE
I
ꢀ=ꢀ5mA
0.2
0.1
V
RESET
V
ꢀ=ꢀ1.01ꢀxꢀV
,T =ꢀ+25°C
µA
OUT
OUT-REG Aꢀ
MODEꢀInternalꢀPullupꢀResistor
THERMAL SHUTDOWN
Thermal-ShutdownꢀThreshold
Thermal-ShutdownꢀHysteresis
500
kΩ
Temperatureꢀrising
166
10
°C
°C
Note 2:ꢀ Allꢀtheꢀlimitsꢀareꢀ100%ꢀtestedꢀatꢀT ꢀ=ꢀ+25°C.ꢀLimitsꢀoverꢀtemperatureꢀareꢀguaranteedꢀbyꢀdesign.
A
Maxim Integrated
ꢀ ꢀ 4
MAX15062
60V、300mA、超小尺寸、高效、
-
同步降压型DC DC转换器
典型工作特性
(V ꢀ=ꢀ24V,ꢀV
ꢀ=ꢀ0V,ꢀC ꢀ=ꢀC
ꢀ=ꢀ1µF,ꢀV
ꢀ=ꢀ1.5V,ꢀT ꢀ=ꢀ+25°C,ꢀunlessꢀotherwiseꢀnoted.)
IN
GND
IN
VCC
EN/UVLO
A
EFFICIENCY vs. LOAD CURRENT
EFFICIENCY vs. LOAD CURRENT
EFFICIENCY vs. LOAD CURRENT
toc02a
100
90
80
70
60
50
40
30
20
100
90
80
70
60
50
40
30
100
90
80
70
60
50
40
V
= 12V
VIN = 6V
IN
V
= 12V
IN
VIN = 12V
V
IN
= 24V
V
= 24V
IN
VIN = 24V
VIN = 36V
V
= 36V
IN
V
IN
= 36V
VIN = 48V
FIGURE 7 APPLICATION
CIRCUIT, PFM MODE
FIGURE 5 APPLICATION
CIRCUIT, PFM MODE
= 3.3V
FIGURE 6 APPLICATION
CIRCUIT, PFM MODE
V
= 48V
IN
V
= 48V
IN
V
= 2.5V
OUT
V
V
= 5V
OUT
OUT
30
1
1
10
LOAD CURRENT (mA)
100
10
100
1
10
100
LOAD CURRENT (mA)
LOAD CURRENT (mA)
EFFICIENCY vs. LOAD CURRENT
EFFICIENCY vs. LOAD CURRENT
EFFICIENCY vs. LOAD CURRENT
toc02b
100
90
80
70
60
50
40
30
20
10
100
90
80
70
60
50
40
30
20
10
0
100
90
80
70
60
50
40
VIN = 24V
V = 12V
IN
VIN = 18V
V
= 12V
IN
V
= 24V
IN
V
= 24V
IN
V
= 36V
V
= 36V
IN
IN
VIN = 36V
VIN = 48V
V
IN
= 48V
V
= 48V
IN
VIN = 60V
FIGURE 8 APPLICATION
CIRCUIT, PFM MODE
FIGURE 5 APPLICATION
CIRCUIT, PWM MODE
FIGURE 6 APPLICATION
CIRCUIT, PWM MODE
V
= 12V
OUT
V
= 3.3V
V
OUT
= 5V
OUT
0
0
50
100
150
200
250
300
0
50
100
150
200
250
300
1
10
LOAD CURRENT (mA)
100
LOAD CURRENT (mA)
LOAD CURRENT (mA)
OUTPUT VOLTAGE
vs. LOAD CURRENT
EFFICIENCY vs. LOAD CURRENT
EFFICIENCY VS. LOAD CURRENT
toc04a
toc04b
100
90
80
70
60
50
40
30
20
10
0
3.37
3.36
3.35
3.34
3.33
3.32
3.31
3.30
3.29
100
90
80
70
60
50
40
30
20
10
VIN = 6V
FIGURE 5 APPLICATION
CIRCUIT, PFM MODE
VIN = 18V
VIN = 24V
V
= 12V, 24V
IN
VIN = 12V
VIN = 24V
VIN = 36V
V
= 36V
IN
V
VIN = 36V
VIN = 48V
VIN = 48V
VIN = 60V
= 48V
IN
FIGURE 7 APPLICATION
CIRCUIT, PWM MODE
FIGURE 8 APPLICATION
CIRCUIT, PWM MODE
V
= 2.5V
OUT
V
= 12V
OUT
0
0
0
50
100
150
200
250
300
0
50
100
150
200
250
300
50
100
150
200
250
300
LOAD CURRENT (mA)
LOAD CURRENT (mA)
LOAD CURRENT (mA)
Maxim Integrated
ꢀ ꢀ 5
MAX15062
60V、300mA、超小尺寸、高效、
-
同步降压型DC DC转换器
典型工作特性(续)
(V ꢀ=ꢀ24V,ꢀV
ꢀ=ꢀ0V,ꢀC ꢀ=ꢀC
ꢀ=ꢀ1µF,ꢀV
ꢀ=ꢀ1.5V,ꢀT ꢀ=ꢀ+25°C,ꢀunlessꢀotherwiseꢀnoted.)
IN
GND
IN
VCC
EN/UVLO
A
OUTPUT VOLTAGE
vs. LOAD CURRENT
OUTPUT VOLTAGE
vs. LOAD CURRENT
OUTPUT VOLTAGE
vs. LOAD CURRENT
toc06b
toc06a
5.10
5.08
5.06
5.04
5.02
5.00
4.98
2.54
2.53
2.52
2.51
2.50
2.49
2.48
12.35
12.30
12.25
12.20
12.15
12.10
12.05
12.00
FIGURE 6 APPLICATION
CIRCUIT, PFM MODE
FIGURE 8 APPLICATION
CIRCUIT, PFM MODE
FIGURE 7 APPLICATION
CIRCUIT, PFM MODE
VIN = 18V
VIN = 24V
VIN = 36V
VIN = 12V
V
= 24V
IN
VIN = 6V,24V
VIN = 36V
V
= 12V, 36V, 48V
IN
VIN = 48V
VIN = 48V,60V
2.47
0
0
50
100
150
200
250
300
50
100
150
200
250
300
0
50
100
150
200
250
300
LOAD CURRENT (mA)
LOAD CURRENT (mA)
LOAD CURRENT (mA)
OUTPUT VOLTAGE
vs. LOAD CURRENT
OUTPUT VOLTAGE
vs. LOAD CURRENT
FEEDBACK VOLTAGE
vs. LOAD CURRENT
toc06c
0.920
0.915
0.910
0.905
0.900
0.895
3.303
3.302
3.301
3.300
3.299
3.298
3.297
5.003
5.002
5.001
5.000
4.999
4.998
4.997
PFM MODE
FIGURE 5 APPLICATION
CIRCUIT, PWM MODE
FIGURE 6 APPLICATION
CIRCUIT, PWM MODE
V
= 48V
IN
VIN = 12V
V
= 36V
IN
V
= 48V
IN
VIN = 6V, 24V
V
= 36V
IN
VIN = 36V
VIN = 48V
V
IN
= 24V
100
V
IN
= 12V
V
IN
= 12V
V
= 24V
200
IN
0
50
150
200
250
300
0
50
100
150
250
300
0
50
100
150
200
250
300
LOAD CURRENT (mA)
LOAD CURRENT (mA)
LOAD CURRENT (mA)
OUTPUT VOLTAGE
vs. TEMPERATURE
OUTPUT VOLTAGE vs. TEMPERATURE
5.04
5.02
5.00
4.98
4.96
4.94
3.32
3.31
3.30
3.29
3.28
3.27
FIGURE 6 APPLICATION
CIRCUIT, LOAD = 300mA
FIGURE 5 APPLICATION
CIRCUIT, LOAD = 300mA
-40 -20
0
20 40 60 80 100 120
TEMPERATURE (°C)
-40 -20
0
20 40 60 80 100 120
TEMPERATURE (°C)
Maxim Integrated
ꢀ ꢀ 6
MAX15062
60V、300mA、超小尺寸、高效、
-
同步降压型DC DC转换器
典型工作特性(续)
(V ꢀ=ꢀ24V,ꢀV
ꢀ=ꢀ0V,ꢀC ꢀ=ꢀC
ꢀ=ꢀ1µF,ꢀV
ꢀ=ꢀ1.5V,ꢀT ꢀ=ꢀ+25°C,ꢀunlessꢀotherwiseꢀnoted.)
IN
GND
IN
VCC
EN/UVLO A
FEEDBACK VOLTAGE
VS. TEMPERATURE
NO-LOAD SUPPLY CURRENT
vs. INPUT VOLTAGE
toc10a
100
98
96
94
92
90
0.908
0.904
0.900
0.896
0.892
0.888
0.884
0.880
PFM MODE
45
5
5
5
15
25
35
55
55
55
-40 -20
0
20 40 60 80 100 120
INPUT VOLTAGE (V)
TEMPERATURE (°C)
NO-LOAD SUPPLY CURRENT
vs. TEMPERATURE
SHUTDOWN CURRENT
vs. INPUT VOLTAGE
140
130
120
110
100
90
6
5
4
3
2
1
0
80
70
PFM MODE
60
-40 -20
0
20 40 60 80 100 120
TEMPERATURE (°C)
15
25
35
45
INPUT VOLTAGE (V)
SHUTDOWN CURRENT
vs. TEMPERATURE
SWITCH CURRENT LIMIT
vs. INPUT VOLTAGE
600
550
500
450
400
350
300
250
200
2.40
2.25
2.10
1.95
1.80
1.65
1.50
SWITCH PEAK CURRENT LIMIT
SWITCH NEGATIVE CURRENT LIMIT
15
25
35
45
-40 -20
0
20 40 60 80 100 120
TEMPERATURE (°C)
INPUT VOLTAGE (V)
Maxim Integrated
ꢀ ꢀ 7
MAX15062
60V、300mA、超小尺寸、高效、
-
同步降压型DC DC转换器
典型工作特性(续)
(V ꢀ=ꢀ24V,ꢀV
ꢀ=ꢀ0V,ꢀC ꢀ=ꢀC
ꢀ=ꢀ1µF,ꢀV
ꢀ=ꢀ1.5V,ꢀT ꢀ=ꢀ+25°C,ꢀunlessꢀotherwiseꢀnoted.)
IN
GND
IN
VCC
EN/UVLO A
EN/UVLO THRESHOLD
vs. TEMPERATURE
SWITCH CURRENT LIMIT
vs. TEMPERATURE
600
550
500
450
400
350
300
250
200
1.24
1.22
1.20
1.18
1.16
1.14
1.12
1.10
1.08
RISING
SWITCH PEAK CURRENT LIMIT
SWITCH NEGATIVE CURRENT LIMIT
FALLING
-40 -20
0
20 40 60 80 100 120
TEMPERATURE (°C)
-40 -20
0
20 40 60 80 100 120
TEMPERATURE (°C)
SWITCHING FREQUENCY
vs. TEMPERATURE
RESET THRESHOLD
vs. TEMPERATURE
98
97
96
95
94
93
92
91
90
560
540
520
500
480
460
RISING
FALLING
440
0
10
20
30
40
50
60
-40 -20
0
20 40 60 80 100 120
TEMPERATURE (°C)
TEMPERATURE (°C)
LOAD TRANSIENT RESPONSE,
LOAD TRANSIENT RESPONSE,
PFM MODE (LOAD CURRENT STEPPED
PFM MODE (LOAD CURRENT STEPPED
FROM 5mA TO 150mA)
FROM 5mA TO 150mA)
MAX15062 toc20
MAX15062 toc21
V
OUT
(AC)
100mV/div
V
OUT
(AC)
100mV/div
FIGURE 5
FIGURE 6
APPLICATION CIRCUIT
APPLICATION CIRCUIT
V
OUT
= 3.3V
V
OUT
= 5V
I
I
OUT
OUT
100mA/div
100mA/div
100µs/div
100µs/div
Maxim Integrated
ꢀ ꢀ 8
MAX15062
60V、300mA、超小尺寸、高效、
-
同步降压型DC DC转换器
典型工作特性(续)
(V ꢀ=ꢀ24V,ꢀV
ꢀ=ꢀ0V,ꢀC ꢀ=ꢀC
ꢀ=ꢀ1µF,ꢀV
ꢀ=ꢀ1.5V,ꢀT ꢀ=ꢀ+25°C,ꢀunlessꢀotherwiseꢀnoted.)
IN
GND
IN
VCC
EN/UVLO A
LOAD TRANSIENT RESPONSE
PFM MODE (LOAD CURRENT STEPPED
FROM 5mA TO 150mA)
LOAD TRANSIENT RESPONSE,
PFM MODE (LOAD CURRENT STEPPED
FROM 5mA TO 150mA)
toc21b
toc21a
VOUT (AC)
VOUT (AC)
100mV/div
200mV/div
FIGURE 8
APPLICATION CIRCUIT
FIGURE 7
APPLICATION CIRCUIT
V
OUT = 2.5V
V
= 12V
OUT
IOUT
IOUT
100mA/div
100mA/div
100µs/div
100µs/div
LOAD TRANSIENT RESPONSE,
LOAD TRANSIENT RESPONSE,
PFM OR PWM MODE (LOAD CURRENT
PFM OR PWM MODE (LOAD CURRENT
STEPPED FROM 150mA TO 300mA)
STEPPED FROM 150mA TO 300mA)
MAX15062 toc22
MAX15062 toc23
V
OUT
(AC)
V
OUT
(AC)
100mV/div
100mV/div
I
OUT
I
OUT
100mA/div
100mA/div
FIGURE 5
FIGURE 6
APPLICATION CIRCUIT
APPLICATION CIRCUIT
V
OUT
= 3.3V
V
OUT
= 5V
40µs/div
LOAD TRANSIENT RESPONSE
PFM OR PWM MODE (LOAD CURRENT
STEPPED FROM 150mA TO 300mA)
40µs/div
LOAD TRANSIENT RESPONSE
PFM OR PWM MODE (LOAD CURRENT
STEPPED FROM 150mA TO 300mA)
toc23a
toc23b
VOUT (AC)
50mV/div
VOUT (AC)
200mV/div
IOUT
100mA/div
IOUT
FIGURE 7
APPLICATION CIRCUIT
FIGURE 8
APPLICATION CIRCUIT
100mA/div
V
= 2.5V
V
= 12V
OUT
OUT
40µs/div
40µs/div
Maxim Integrated
ꢀ ꢀ 9
MAX15062
60V、300mA、超小尺寸、高效、
-
同步降压型DC DC转换器
典型工作特性(续)
(V ꢀ=ꢀ24V,ꢀV
ꢀ=ꢀ0V,ꢀC ꢀ=ꢀC
ꢀ=ꢀ1µF,ꢀV
ꢀ=ꢀ1.5V,ꢀT ꢀ=ꢀ+25°C,ꢀunlessꢀotherwiseꢀnoted.)
IN
GND
IN
VCC
EN/UVLO A
LOAD TRANSIENT RESPONSE,
PWM MODE (LOAD CURRENT
LOAD TRANSIENT RESPONSE,
PWM MODE PWM mode (LOAD CURRENT
STEPPED FROM NO LOAD TO 150mA)
STEPPED FROM NO LOAD TO 150mA)
MAX15062 toc24
MAX15062 toc25
V
OUT
(AC)
V
OUT
(AC)
100mV/div
100mV/div
FIGURE 5
FIGURE 6
APPLICATION CIRCUIT
APPLICATION CIRCUIT
V
OUT
= 3.3V
V
OUT
= 5V
I
I
OUT
OUT
100mA/div
100mA/div
40µs/div
LOAD TRANSIENT RESPONSE
40µs/div
LOAD TRANSIENT RESPONSE
PWM MODE (LOAD CURRENT STEPPED
PWM MODE (LOAD CURRENT STEPPED
FROM NO LOAD TO 150mA)
FROM NO LOAD TO 150mA)
toc25b
toc25a
VOUT (AC)
VOUT (AC)
50mV/div
200mV/div
FIGURE 8
APPLICATION CIRCUIT
FIGURE 7
APPLICATION CIRCUIT
V
= 12V
OUT
V
= 2.5V
OUT
IOUT
100mA/div
IOUT
100mA/div
40µs/div
40µs/div
FULL-LOAD SWITCHING WAVEFORMS
SWITCHING WAVEFORMS
(PFM MODE)
(PWM OR PFM MODE)
MAX15062 toc27
MAX15062 toc26
V
= 5V,
OUT
LOAD = 300mA
FIGURE 6 APPLICATION CIRCUIT
= 5V, LOAD = 20mA
V
OUT
V
(AC)
OUT
V
(AC)
OUT
20mV/div
100mV/div
V
LX
10V/div
V
LX
10V/div
I
OUT
I
OUT
200mA/div
100mA/div
2µs/div
10µs/div
Maxim Integrated
ꢀ ꢀ 10
MAX15062
60V、300mA、超小尺寸、高效、
-
同步降压型DC DC转换器
典型工作特性(续)
(V ꢀ=ꢀ24V,ꢀV
ꢀ=ꢀ0V,ꢀC ꢀ=ꢀC
ꢀ=ꢀ1µF,ꢀV
ꢀ=ꢀ1.5V,ꢀT ꢀ=ꢀ+25°C,ꢀunlessꢀotherwiseꢀnoted.)
IN
GND
IN
VCC
EN/UVLO A
NO-LOAD SWITCHING WAVEFORMS
(PWM MODE)
SOFT-START
MAX15062 toc28
MAX15062 toc29
V
= 5V
OUT
V
EN/UVLO
5V/div
V
OUT
(AC)
20mV/div
V
LX
V
OUT
10V/div
1V/div
FIGURE 5
APPLICATION CIRCUIT
= 3.3V
V
OUT
I
OUT
I
OUT
100mA/div
100mA/div
V
RESET
5V/div
2µs/div
1ms/div
SOFT-START
SOFT-START
toc30a
MAX15062 toc30
VEN/UVLO
5V/div
V
EN/UVLO
5V/div
VOUT
1V/div
IOUT
V
OUT
100mA/div
1V/div
FIGURE 6
FIGURE 7
APPLICATION CIRCUIT
APPLICATION CIRCUIT
= 5V
V
OUT
I
V
= 2.5V
OUT
OUT
VRESET
5V/div
100mA/div
V
RESET
5V/div
1ms/div
1ms/div
SOFT-START
SHUTDOWN WITH ENABLE
MAX15062 toc31
toc30b
VEN/UVLO
5V/div
V
EN/UVLO
5V/div
V
OUT
VOUT
5V/div
1V/div
I
OUT
100mA/div
IOUT
100mA/div
FIGURE 8
APPLICATION CIRCUIT
V
= 12V
OUT
V
RESET
5V/div
VRESET
5V/div
400µs/div
1ms/div
Maxim Integrated
ꢀ ꢀ 11
MAX15062
60V、300mA、超小尺寸、高效、
-
同步降压型DC DC转换器
典型工作特性(续)
(V ꢀ=ꢀ24V,ꢀV
ꢀ=ꢀ0V,ꢀC ꢀ=ꢀC
ꢀ=ꢀ1µF,ꢀV
ꢀ=ꢀ1.5V,ꢀT ꢀ=ꢀ+25°C,ꢀunlessꢀotherwiseꢀnoted.)
IN
GND
IN
VCC
EN/UVLO A
SOFT-START WITH 3V PREBIAS
OVERLOAD PROTECTION
MAX15062 toc33
MAX15062 toc32
V
V
IN
20V/div
EN/UVLO
5V/div
V
OUT
V
OUT
1V/div
2V/div
FIGURE 6
APPLICATION CIRCUIT
NO LOAD
PWM MODE
I
OUT
200mA/div
V
RESET
5V/div
1ms/div
20ms/div
BODE PLOT
BODE PLOT
MAX15062 toc34
MAX15062 toc35
50
40
180
144
108
72
50
40
180
144
108
72
GAIN
GAIN
30
30
PHASE
PHASE
20
20
10
36
10
36
0
0
0
0
f
= 47kHz,
f
= 47kHz,
CR
CR
-10
-20
-30
-40
-50
-36
-72
-108
-144
-180
-10
-20
-30
-40
-50
-36
-72
-108
-144
-180
PHASE MARGIN = 59°
PHASE MARGIN = 60°
FIGURE 5 APPLICATION CIRCUIT
= 3.3V
FIGURE 6 APPLICATION CIRCUIT
V = 5V
OUT
V
OUT
2
4
6 8 1
10k
2
4
6 8 1
100k
2
2
4
6 8 1
10k
2
4
6 8 1
100k
2
1k
1k
FREQUENCY (Hz)
FREQUENCY (Hz)
BODE PLOT
BODE PLOT
MAX15062 toc35b
MAX15062 toc35a
50
40
180
144
108
72
50
40
180
144
108
72
GAIN
GAIN
30
30
20
20
PHASE
PHASE
10
36
10
36
0
0
0
0
f
= 43kHz,
CR
f
= 36kHz,
CR
PHASE MARGIN = 60°
-10
-20
-30
-40
-50
-36
-72
-108
-144
-180
-10
-20
-30
-40
-50
-36
-72
-108
-144
-180
PHASE MARGIN = 66°
FIGURE 7 APPLICATION CIRCUIT
= 2.5V
FIGURE 8 APPLICATION CIRCUIT
V
OUT
V
= 12V
OUT
1k
10k
100k
1k
10k
100k
FREQUENCY (Hz)
FREQUENCY (Hz)
Maxim Integrated
ꢀ ꢀ 12
MAX15062
60V、300mA、超小尺寸、高效、
-
同步降压型DC DC转换器
引脚配置
TOP VIEW
LX
8
GND RESET MODE
5
7
6
MAX15062
1
2
3
4
FB/V
+
V
EN/UVLO
V
CC
IN
OUT
TDFN
(2mm x 2mm)
引脚说明
引脚
名称
说明
1
V
开关稳压器电源输入。在V 和GND之间连接旁路陶瓷电容X7Rꢀ1μF。
IN
IN
高电平有效使能/欠压检测输入。将EN/UVLO拉低至GND时，禁止稳压器输出；将EN/UVLO连接至V
IN
2
EN/UVLO 时，始终保持有效工作。在V 及EN/UVLO与GND之间连接电阻分压器，设置器件使能/开启时的输入电
IN
压。
3
4
V
内部LDO电源输出，利用最小1μF电容将V 旁路至GND。
CC
CC
反馈电源输入，将FB/V
直接连接至输出。对于固定输出电压版本，ꢀ在V
和GND之间，连接FB/
OUT
OUT
FB/V
OUT
V
到一个电阻分压器，用来调节0.9V至0.89ꢀxꢀV 的输出电压。
IN
OUT
PFM/PWM模式选择输入。MODE连接至GND时，使能固定频率PWM工作；浮空时，工作在轻载PFM模
式。
5
6
MODE
开漏复位输出，利用外部电阻将RESET拉高至外部电源。
当输出电压下降至设定标称稳压值的92%以下时，RESET为低电平；输出电压上升2ms电阻至稳压值的
95%以上时，RESET返回高电平。门限值请参见ElectricalꢀCharacteristics表。
RESET
7
GND
地。将GND连接至电源接地区域。通过单点将所有电路地连接在一起，参见PCB布局指南部分。
电感连接。将LX连接至电感的开关侧。器件处于关断模式时，LX为高阻。
8
LX
Maxim Integrated
ꢀ ꢀ 13
MAX15062
60V、300mA、超小尺寸、高效、
-
同步降压型DC DC转换器
方框图
V
IN
LDO
REGULATOR
PEAK-LIMIT
RUNAWAY-
LIMIT
CURRENT-
SENSE
LOGIC
CURRENT-
SENSE
AMPLIFIER
V
CC
CS
PFM
MAX15062
POK
EN/UVLO
DH
HIGH-SIDE
DRIVER
CHIPEN
CLK
1.215V
THERMAL
SHUTDOWN
LX
V
CC
OSCILLATOR
SLOPE
500kΩ
MODE
DL
PFM/PWM
CONTROL
LOGIC
LOW-SIDE
DRIVER
MODE SELECT
0.55V
CC
SLOPE
CS
R1
*
LOW-SIDE
CURRENT
SENSE
SINK-LIMIT
PWM
FB/V
OUT
NEGATIVE
CURRENT
REF
ERROR
AMPLIFIER
GND
R2
3.135V FOR MAX15062A
4.75V FOR MAX15062B
0.859V FOR MAX15062C
CLK
RESET
REFERENCE
SOFT-START
2ms
DELAY
FB/V
OUT
*RESISTOR-DIVIDER ONLY FOR MAX15062A, MAX15062B
Maxim Integrated
ꢀ ꢀ 14
MAX15062
60V、300mA、超小尺寸、高效、
-
同步降压型DC DC转换器
固定的开关频率。然而，相对于PFM工作模式，PWM模
式在轻载条件下效率较低。
详细说明
-
MAX15062高 效、 高 压、 同 步 降 压 型DC DC转 换 器 内
部集成了MOSFET，工作在4.5V至60V宽输入电压范
围。转换器提供高达300mA的输出电流，输出电压为
3.3Vꢀ(MAX15062A)、5Vꢀ(MAX15062B)和 可 调 输 出 电 压
(MAX15062C)。满足EN/UVLO和VCCꢀUVLO时，内部软启
动电路控制误差放大器基准开启，提供确定的单调输出电
压软启动，与负载电流无关。FB/VOUT引脚通过内部电阻
分压器监测输出电压。输出电压达到稳压值的95%ꢀ2ms后，
RESET置于高阻态。根据上电时MODE引脚的状态，器件
选择PFM或强制PWM工作模式。通过拉低EN/UVLO引脚，
PFM工作模式
PFM工作模式可消除负向电感电流以及轻载下额外的跳脉
冲，以获得较高效率。PFM模式下，每时钟周期的电感电
流峰值强制为固定的130mA，直到输出上升到标称电压的
102.3%。输出达到标称电压的102.3%后，关断高边和低
边FET，器件进入深度休眠状态，直到负载将输出放电至
标称电压的101.1%。深度休眠模式下，大部分内部电路
关断，以节约静态电流。输出下降至标称电压的101.1%
以下时，器件退出深度休眠模式，打开全部内部电路，再
次以脉冲方式开始向输出传送能量，直到输出达到标称输
出电压的102.3%。当负载电流超过55mAꢀ(典型值)时，器
件自然进入PFM模式。PFM模式的优点是轻载下消耗极低
的静态电流，因此获得较高效率。ꢀ
μ
器件进入关断模式，待机电流仅为2.2 Aꢀ(典型值)。
DC-DC开关稳压器
器件采用内部补偿、固定频率、电流模式控制架构(方框图ꢀ
部分)。在内部时钟的上升沿，高边pMOSFET导通。内
部误差放大器将反馈电压与内部基准固定电压进行比
较，产生误差电压；由PWM比较器将误差电压与电流
检测电压和斜率补偿电压之和进行比较，设置导通时间 ꢀ
pMOSFET导通期间，电感电流线性爬升。在开关周期的其
余时间(关闭时间)，pMOSFET保持关断，低边nMOSFETꢀ
导通。关断期间，随着电感电流下降，电感释放储能，为
输出提供电流。过载条件下，逐周期限流电路通过关闭高
边pMOSFET、导通低边nMOSFET限制电感的峰值电流。
内部5V线性稳压器
内部稳压器提供5V标称电压，为内部功能电路供电，并
μ
驱动功率MOSFET。应利用1 F电容将线性稳压器的输出
(VCC)旁路至GND。VCC稳压器压差的典型值为150mV。当
VCC下降至3.8V(典型值)以下时，欠压锁定电路关断稳压器。
400mVꢀVCCꢀUVLO滞回可防止上电、关断时的抖动。
使能输入(EN/UVLO)、软启动
当EN/UVLO电压高于1.21Vꢀ(典型值)时，器件内部的误差
放大器基准电压开始上升。软启动上升持续时间为4.1ms，
允许输出电压平稳地增大。将EN/UVLO驱动为低电平时，
关断两个功率MOSFET及其它内部电路，将VIN静态电流降
模式选择(MODE)
在VCC和EN/UVLO电压超过相应UVLO上升门限，同时内
部电压就绪、允许LX进行开关工作后，锁存MODE引脚的
逻辑状态。如果MODE引脚在上电时浮空，器件在轻载时
工作在PFM模式；如果MODE引脚在上电时接地，器件在
所有负载条件下工作在固定频率PWM模式。常规工作期
间，忽略MODE引脚的状态变化。
μ
低至2.2 A以下。EN/UVLO可用作输入电压UVLO调节输
入。VIN及EN/UVLO与GND之间的外部分压器控制器件开
启或关断时的输入电压。如果不需要设置输入UVLO，将
EN/UVLO连接至VINꢀ(关于EN/UVLO上升和下降门限电压，
请参见ElectricalꢀCharacteristics表)。
PWM工作模式
PWM模式下，允许电感电流出现负值。在对频率敏感的
应用中，PWM工作模式非常有用，任何负载条件下保持
Maxim Integrated
ꢀ ꢀ 15
MAX15062
60V、300mA、超小尺寸、高效、
-
同步降压型DC DC转换器
周期峰值限流电路将断开高边MOSFET。高输入电压、短
路条件(输出电压不足以恢复降压转换器导通期间建立的电
感电流)下，高边开关0.66Aꢀ(典型值)失控电流检测门限将
为器件提供有效保护。一旦达到失控电流门限，则触发打
嗝模式。此外，完成软启动后，如果输出电压在任何时间
因为故障条件而下降到标称电压的65%ꢀ(典型值)，同样触
发打嗝模式。打嗝模式下，在打嗝超时周期(31ms)内暂停
开关工作，保护转换器。达到打嗝超时周期后，再次尝试
软启动。打嗝工作模式确保输出短路条件下保持低功耗。
复位输出(RESET)
器件包括开漏输出RESET，以监测输出电压。输出电压上
升至其标称电压的95%以上2ms后，RESET变为高电平；
输出电压跌落到标称稳压值的92%以下时，RESET拉低。
打嗝超时周期内，触发RESET输出低电平。
启动时进入预偏置输出
器件能够在软启动时进入预偏置输出，在PFM和强制
PWM模式下都无需对输出电容放电。对于需要多路电源
供电的数字集成电路应用，该功能非常有用。
电路板布局及系统连接时应谨慎，防止在短路条件下FB/
VOUT引脚超过绝对最大额定值。此类条件下，陶瓷输出电
容可能会随输出电容或短路负载之间的电路板或接线电感
输入电压工作范围
-
发生振荡，造成FB/VOUTꢀ ( 0.3V)超过绝对最大额定值。应
最高输入工作电压由最小导通时间决定，最低输入工作电
压由最大占空比及电路压差决定。给定输出电压的最小和
最大工作输入电压，计算如下：
将寄生电路板或接线电感降至最小，并验证短路条件下的
输出电压波形，确保FB/VOUT不超过绝对最大额定值。
热过载保护
V
+ (I
×(R
+ 0.5))
DCR
OUT
OUT
D
V
=
+ (I
×1.0)
OUT
°
热过载保护限制器件的总功耗。结温超过+166 C时，片上
温度传感器关断器件，关闭内部功率MOSFET，允许器件
INMIN
MAX
°
冷却。结温降低10 C后，温度传感器控制器件恢复工作。
V
OUT
V
=
INMAX
t
× f
ONMIN SW
应用信息
式中，VOUT为稳态输出电压，IOUT为最大负载电流，RDCR
为电感的直流电阻，fSW为开关频率(最大值)，DMAX为最
大占空比(0.9)，tONMIN为最差工作条件下的最小开关导通
时间(130ns)。
电感选择
在保证尺寸合适的前提下，应选择直流电阻最低的低损耗
电感。饱和电流(ISAT)必须足够高，确保在0.56Aꢀ(典型值)最
大限流(IPEAK LIMIT)的条件下不发生饱和。对于5V和3.3V固
-
定输出电压、300mA负载电流应用，请参见表1选择电感。
过流保护/打嗝模式
器件具有可靠的过流保护机制，在过载和输出短路条件下
有效保护器件。高边开关电流超过0.56Aꢀ(典型值)时，逐
Maxim Integrated
ꢀ ꢀ 16
MAX15062
60V、300mA、超小尺寸、高效、
-
同步降压型DC DC转换器
表1.ꢀ电感选择
INPUT VOLTAGE
RANGE V (V)
IN
V
(V)
I
(mA)
L (µH)
RECOMMENDED PART NO.
OUT
OUT
4.5ꢀtoꢀ60
6ꢀtoꢀ60
3.3ꢀ(Fixed)
5ꢀ(Fixed)
1.8ꢀorꢀ2.5
12
300
33
47
CoilcraftꢀLPS4018-333ML
CoilcraftꢀLPS4018-473ML
CoilcraftꢀLPS4018-223ML
Wurthꢀ74408943101
300
300
300
300
4.5ꢀtoꢀ60
14ꢀtoꢀ60
17ꢀtoꢀ60
22
100
150
15
TDKꢀVLC6045T-151M
表2.ꢀ输入和输出电容选择
INPUT VOLTAGE
RANGE V (V)
IN
V
(V)
I
(mA)
C (µF)
OUT
RECOMMENDED PART NO.
OUT
OUT
4.5ꢀtoꢀ60
6ꢀtoꢀ60
3.3ꢀ(Fixed)
5ꢀ(Fixed)
1.8ꢀorꢀ2.5
12
300
10µF/1206/X7R/6.3V
10µF/1206/X7R/6.3V
22µF/1206/X7R/6.3V
4.7µF/1206/X7R/16V
4.7µF/1206/X7R/25V
MurataꢀGRM31CR70J106K
MurataꢀGRM31CR70J106K
MurataꢀGRM31CR70J226K
MurataꢀGRM31CR71C475K
MurataꢀGRM31CR71E475K
300
300
300
300
4.5ꢀtoꢀ60
14ꢀtoꢀ60
17ꢀtoꢀ60
15
的内部控制环路。合理选择输出电容，通常使其能够在最
大50%的负载电流跃变，确保输出电压偏差小于3%。器
V
IN
V
IN
MAX15062
EN/UVLO
μ
件需要至少10 F电容保证稳定工作，可利用下式计算必需
R1
R2
的输出电容：
30
C
=
OUT
V
OUT
μ
式中，COUT为 F输出电容，而VOUT为输出电压。典型应用，
请参考表2选择输出电容。
图1.ꢀ可调节EN/UVLO网络
设置输入欠压锁定电平
输入电容
可调节器件的输入欠压锁定电平。利用VIN和GND之间连
接的电阻分压器(见图1)设置器件开启工作时的电压。将分
压器的中间节点连接至EN/UVLO。
推荐器件使用小尺寸陶瓷电容。输入电容降低来自于电源
的尖峰电流，减小开关电路引起的输入噪声和电压纹波。
μ
推荐使用最小1 F、X7R、封装大于0805的电容作为器件
的输入电容，保证输入电压纹波小于最小输入电压的2%，
并满足最大纹波电流要求。对于固定5V和3.3V输出电压、
300mA负载电流应用，请参见表2选择输入电容。
选择R1，最大3.3MΩ，按下式计算R2：
R1×1.215
R2 =
(V
-1.215)
INU
输出电容
小尺寸陶瓷X7R电容即足以满足多数应用的要求。输出电
容有两种功能：滤除器件以及输出电感产生的纹波；储存
足够的能量，在负载瞬变条件下支撑输出电压并稳定器件
式中，VINU为开启器件工作所要求的电压。
Maxim Integrated
ꢀ ꢀ 17
MAX15062
60V、300mA、超小尺寸、高效、
-
同步降压型DC DC转换器
调节输出电压
PCB布局指南
MAX15062C输出电压可设置为0.9V至0.89ꢀ xꢀ VIN。通过在
输出至FB及GND之间连接电阻分压器，设定输出电压(见
图2)。
严谨的PCB布局(见图2)是实现干净、稳定工作的关键，尤
其是功率开关级，需要特别注意。遵循以下原则有助于获
得良好的PCB布局：
对于小于6V的输出电压，在50kΩ至150kΩ范围内选择R2；
对于大于6V的输出电压，在25kΩ至75kΩO范围内选择R2，
然后利用下式计算R1：
输入陶瓷电容尽量靠近VIN和GND引脚放置。
●ꢀ
●ꢀ 利用最短走线或接地区域将VCC旁路电容的负端点连接
至GND。
●ꢀ 将LX引脚和电感连接形成的区域降至最小，减小EMI辐
V
OUT
R1 = R2 ×
− 1
射。
0.9
●ꢀ VCC去抖电容尽量靠近VCC引脚放置。
●ꢀ 确保所有反馈连线短而直。
功耗
点高速开关节点(LX)远离FB/VOUT、RESET和MODE引脚。
°
应确保器件结温在规定电源工作条件下不超过+125 C。特
定工作条件下，按下式估算导致器件温度升高的功耗：
可参考MAX15062评估板，将其作为PCB布局实例，从以
下网站下载：china.maximintegrated.com。
1
2
P
= P
×
- 1 - (I
×R
)
DCR
LOSS
OUT
OUT
η
V
OUT
P
= V
×I
OUT OUT
OUT
R1
式中，POUT为输出功率，η为电源转换效率，RDCR为输
出电感的直流电阻。关于电源转换效率或通过测量效率确
定总功耗的信息，请参见典型工作特性部分。
FB
MAX15062C
GND
R2
可利用下式估算器件在任意给定环境温度(TA)下的结温
(TJ)：
T = T + θ ×P
LOSS
(
)
J
A
JA
式中，θJA为封装结至环境的热阻。
图2.ꢀ设置输出电压
Maxim Integrated
ꢀ ꢀ 18
MAX15062
60V、300mA、超小尺寸、高效、
-
同步降压型DC DC转换器
L1
V
IN
V
V
LX
IN
OUT
C
IN
C
OUT
R1
R2
GND
EN/UVLO
MAX15062A/B
V
OUT
V
CC
V
CC
RESET
C
VCC
R3
MODE
V
CC
V
PLANE
IN
C
IN
U1
L1
LX
R1
V
IN
EN/UVLO
GND
RESET
C
OUT
V
CC
R2
V
OUT
C
VCC
MODE
V
OUT
PLANE
GND
PLANE
R3
VIAS TO V
VIAS TO V
VIAS TO BOTTOM-SIDE GROUND PLANE
OUT
CC
图3.ꢀMAX15062A和MAX15062B布局指南
Maxim Integrated
ꢀ ꢀ 19
MAX15062
60V、300mA、超小尺寸、高效、
-
同步降压型DC DC转换器
L1
V
IN
V
V
LX
IN
OUT
C
IN
C
OUT
R1
R2
GND
EN/UVLO
R4
R5
MAX15062C
FB
V
CC
V
CC
RESET
C
VCC
R3
MODE
V
CC
V
PLANE
IN
C
IN
U1
L1
LX
R1
V
IN
EN/UVLO
GND
RESET
C
OUT
V
CC
R2
FB
C
VCC
MODE
V
OUT
PLANE
R5
R4
GND
PLANE
R3
VIAS TO V
VIAS TO V
VIAS TO BOTTOM-SIDE GROUND PLANE
OUT
CC
图4.ꢀMAX15062C布局指南
Maxim Integrated
ꢀ ꢀ 20
MAX15062
60V、300mA、超小尺寸、高效、
-
同步降压型DC DC转换器
L1
33µH
L1
47µH
V
V
V
V
IN
6V TO
60V
OUT
OUT
IN
3.3V,
5V,
4.5V TO
60V
V
LX
V
LX
IN
IN
C
IN
1µF
C
IN
1µF
300mA
300mA
C
C
OUT
10µF
OUT
10µF
EN/UVLO
GND
EN/UVLO
GND
MAX15062A
MAX15062B
V
CC
V
CC
RESET
RESET
C
VCC
1µF
C
VCC
1µF
V
V
MODE
MODE
OUT
OUT
MODE = GND FOR PWM
MODE = OPEN FOR PFM
MODE = GND FOR PWM
MODE = OPEN FOR PFM
L1: COILCRAFT LPS4018-333ML
L1: COILCRAFT LPS4018-473ML
C
: MURATA 10µF/X7R/6.3V/1206 GRM31CR70J106K
OUT
C
: MURATA 10µF/X7R/6.3V/1206 GRM31CR70J106K
OUT
C : MURATA 1µF/X7R/100V/1206 GRM31CR72A105K
IN
C
: MURATA 1µF/X7R/100V/1206 GRM31CR72A105K
IN
图5.ꢀ3.3V、300mA降压型稳压器
图6.ꢀ5V、300mA降压型稳压器
L1
100µH
L1
22µH
V
V
OUT
IN
V
V
OUT
IN
12V,
14V TO
60V
V
LX
2.5V,
IN
4.5V TO
60V
V
LX
IN
C
IN
1µF
300mA
C
C
IN
1µF
OUT
300mA
C
OUT
4.7µF
22µF
EN/UVLO
GND
EN/UVLO
GND
R1
R1
MAX15062C
MAX15062C
499kΩ
133kΩ
V
CC
FB
V
CC
FB
C
VCC
1µF
C
VCC
1µF
R2
R2
MODE
RESET
MODE
RESET
40.2kΩ
75kΩ
MODE = GND FOR PWM
MODE = OPEN FOR PFM
MODE = GND FOR PWM
MODE = OPEN FOR PFM
L1: Wurth 74408943101
L1: COILCRAFT LPS4018-223ML
C
C
: MURATA 4.7µF/X7R/16V/1206 (GRM31CR71C475K)
C
: MURATA 22µF/X7R/6.3V/1206 (GRM31CR70J226K)
OUT
OUT
: MURATA 1µF/X7R/100V/1206 (GRM31CR72A105K)
C : MURATA 1µF/X7R/100V/1206 (GRM31CR72A105K)
IN
IN
图8.ꢀ12V、300mA降压稳压器
图7.ꢀ2.5V、300mA降压稳压器
Maxim Integrated
ꢀ ꢀ 21
MAX15062
60V、300mA、超小尺寸、高效、
-
同步降压型DC DC转换器
定购信息
L1
22µH
V
器件
温度范围
引脚-封装
V
OUT
V
OUT
IN
1.8V,
4.5V TO
60V
V
LX
IN
C
IN
300mA
C
MAX15062AATA+
MAX15062BATA+
MAX15062CATA+
-40°C至+125°C
-40°C至+125°C
-40°C至+125°C
8ꢀTDFN
8ꢀTDFN
8ꢀTDFN
3.3V
5V
OUT
1µF
22µF
EN/UVLO
GND
R1
MAX15062C
Adj
75kΩ
+表示无铅(Pb)/符合RoHS标准的封装。
V
CC
FB
C
VCC
1µF
R2
MODE
RESET
75kΩ
芯片信息
PROCESS:ꢀBiCMOS
MODE = GND FOR PWM
MODE = OPEN FOR PFM
L1: COILCRAFT LPS4018-223ML
C
C
: MURATA 22µF/X7R/6.3V/1206 (GRM31CR70J226K)
OUT
IN
封装信息ꢀ
: MURATA 1µF/X7R/100V/1206 (GRM31CR72A105K)
如需最近的封装外形信息和焊盘布局(占位面积)，请查询china.
+
maximintegrated.com/packages。请注意，封装编码中的“ ”、“#”
图9.ꢀ1.8V、300mA降压稳压器
-
或“ ”仅表示RoHS状态。封装图中可能包含不同的尾缀字符 ꢀ 但封
装图只与封装有关，与RoHS状态无关。
封装类型
封装编码
外形编号
焊盘布局编号
L1
150µH
V
V
OUT
IN
8ꢀTDFN
T822CN+1
21-0487
90-0349
15V,
17V TO
60V
V
LX
IN
C
IN
300mA
C
OUT
1µF
4.7µF
EN/UVLO
GND
R1
MAX15062C
499kΩ
V
CC
FB
C
VCC
1µF
R2
MODE
RESET
31.6kΩ
MODE = GND FOR PWM
MODE = OPEN FOR PFM
L1: TDK VLC6045T-151M
C
C
: MURATA 4.7µF/X7R/25V/1206 (GRM31CR71E475K)
OUT
IN
: MURATA 1µF/X7R/100V/1206 (GRM31CR72A105K)
图10.ꢀ15V、300mA降压稳压器
Maxim Integrated
ꢀ ꢀ 22
MAX15062
60V、300mA、超小尺寸、高效、
-
同步降压型DC DC转换器
修订历史
修订号
修订日期
6/13
说明
修改页
—
0
1
最初版本。
增加了MAX15062C、特性、全部更新了图像及表格。
10/13
1ꢀ-17
Maxim北京办事处
北京8328信箱ꢀ邮政编码100083
免费电话：800ꢀ810ꢀ0310
电话：010-6211ꢀ5199
传真：010-6211ꢀ5299
Maxim不对Maxim产品以外的任何电路使用负责，也不提供其专利许可。Maxim保留在任何时间、没有任何通报的前提下修改产品资料和规格的权利。电气
特性表中列出的参数值(最小值和最大值)均经过设计验证，数据资料其它章节引用的参数值供设计人员参考。
Maxim Integrated 160 Rio Robles, San Jose, CA 95134 USA 1-408-601-10 00
23
©
2013 Maxim Integrated
Maxim标志和MaximꢀIntegrated是MaximꢀIntegratedꢀProducts,ꢀInc.的商标。
EVALUATION KIT AVAILABLE
MAX15062
60V, 300mA, Ultra-Small, High-Efficiency,
Synchronous Step-Down DC-DC Converters
General Description
Benefits and Features
●ꢀ EliminatesꢀExternalꢀComponentsꢀandꢀReduces
The MAX15062 high-efficiency, high-voltage, synchronous
step-down DC-DC converter with integrated MOSFETs
operates over a 4.5V to 60V input voltage range. The
converter delivers output current up to 300mA at 3.3V
(MAX15062A), 5V (MAX15062B), and adjustable output
voltages (MAX15062C). The device operates over the
-40°C to +125°C temperature range and is available in a
compact 8-pin (2mm x 2mm) TDFN package. Simulation
models are available.
Total Cost
ꢀ
•ꢀ NoꢀSchottky—SynchronousꢀOperationꢀforꢀHighꢀ
EfficiencyꢀandꢀReducedꢀCost
ꢀ
ꢀ
•ꢀ InternalꢀCompensation
•ꢀ InternalꢀFeedbackꢀDividerꢀforꢀFixedꢀ3.3V,ꢀ5Vꢀ
Output Voltages
ꢀ
•ꢀ InternalꢀSoft-Start
• All-Ceramic Capacitors, Ultra-Compact Layout
●ꢀ ReducesꢀNumberꢀofꢀDC-DCꢀRegulatorsꢀtoꢀStock
•ꢀ Wideꢀ4.5Vꢀtoꢀ60VꢀInputꢀVoltageꢀRange
The device employs a peak-current-mode control archi-
tecture with a MODE pin that can be used to operate the
device in pulse-width modulation (PWM) or pulse-fre-
quency modulation (PFM) control schemes. PWM opera-
tion provides constant frequency operation at all loads
and is useful in applications sensitive to variable switch-
ing frequency. PFM operation disables negative inductor
current and additionally skips pulses at light loads for high
efficiency. The low-resistance on-chip MOSFETs ensure
high efficiency at full load and simplify the PCB layout.
• Fixed 3.3V and 5V Output Voltage Options
• Adjustable 0.9V to 0.89 x V Output Voltage
IN
Option
• Delivers Up to 300mA Load Current
• Configurable Between PFM and Forced-PWM
Modes
●ꢀ ReducesꢀPowerꢀDissipation
• Peak Efficiency = 92%
•ꢀ PFMꢀFeatureꢀforꢀHighꢀLight-LoadꢀEfficiency
• Shutdown Current = 2.2µA (typ)
To reduce input inrush current, the device offers an
internal soft-start. The device also incorporates an EN/
UVLO pin that allows the user to turn on the part at the
desired input-voltage level. An open-drain RESET pin can
be used for output-voltage monitoring.
●ꢀ OperatesꢀReliablyꢀinꢀAdverseꢀIndustrialꢀEnvironments
•ꢀ Hiccup-ModeꢀCurrentꢀLimitꢀandꢀAutoretryꢀStartup
ꢀ
•ꢀ Built-InꢀOutputꢀVoltageꢀMonitoringꢀwithꢀOpen-Drainꢀ
RESET Pin
• Programmable EN/UVLO Threshold
• Monotonic Startup into Prebiased Output
• Overtemperature Protection
Applications
●ꢀ ProcessꢀControl
●ꢀ IndustrialꢀSensors
●ꢀ 4–20mAꢀCurrentꢀLoops
●ꢀ HVACꢀandꢀBuildingꢀControl
●ꢀ High-VoltageꢀLDOꢀReplacement
●ꢀ General-PurposeꢀPoint-of-Load
•ꢀ -40°Cꢀtoꢀ+125°CꢀAutomotive/Industrialꢀ
ꢀ
TemperatureꢀRange
Typical Operating Circuit
L1
33µH
V
V
OUT
IN
3.3V,
4.5V TO
60V
V
LX
IN
C
IN
300mA
C
OUT
Ordering Information appears at end of data sheet.
1µF
10µF
EN/UVLO
GND
For related parts and recommended products to use with this part, refer
MAX15062A
to www.maximintegrated.com/MAX15062.related.
V
CC
RESET
C
VCC
1µF
V
MODE
OUT
19-6685; Rev 1; 10/13
MAX15062
60V, 300mA, Ultra-Small, High-Efficiency,
Synchronous Step-Down DC-DC Converters
Absolute Maximum Ratings
V
ꢀtoꢀGND..............................................................-0.3V to 70V
Continuous Power Dissipation (T = +70°C)
A
IN
EN/UVLOꢀtoꢀGND....................................................-0.3V to 70V
LXꢀtoꢀGND....................................................-0.3V to V + 0.3V
8-Pin TDFN (derate 6.2mW/NC above +70°C) ...........496mW
OperatingꢀTemperatureꢀRange......................... -40°C to +125°C
Junction Temperature......................................................+150°C
StorageꢀTemperatureꢀRange............................ -65°C to +150°C
Soldering Temperature (reflow).......................................+260°C
Lead Temperature (soldering, 10s) .................................+300°C
IN
V
, FB/V
, RESETꢀtoꢀGND ...............................-0.3V to 6V
CC
OUT
MODEꢀtoꢀGND.............................................-0.3V to V
+ 0.3V
CC
LXꢀtotalꢀRMSꢀCurrent.....................................................±800mA
Output Short-Circuit Duration....................................Continuous
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these
or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect
device reliability.
(Note 1)
Package Thermal Characteristics
TDFN
Junction-to-AmbientꢀThermalꢀResistanceꢀ(θ ) ......+162°C/W
JA
Junction-to-CaseꢀThermalꢀResistanceꢀ(θ ).............+20°C/W
JC
Note 1: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-layer
board. For detailed information on package thermal considerations, refer to www.maximintegrated.com/thermal-tutorial.
Electrical Characteristics
(V = 24V, V
= 0V, C = C
= 1µF, V
= 1.5V, LX = MODE = RESET = unconnected; T = T = -40°C to +125°C, unless
IN
GND
IN
VCC
EN/UVLO A J
otherwise noted. Typical values are at T ꢀ=ꢀ+25°C.ꢀAllꢀvoltagesꢀareꢀreferencedꢀtoꢀGND,ꢀunlessꢀotherwiseꢀnoted.)ꢀ(Noteꢀ2)
A
PARAMETER
INPUT SUPPLY (VIN)
InputꢀVoltageꢀRange
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
V
4.5
60
4
V
IN
InputꢀShutdownꢀCurrent
I
V
= 0V, shutdown mode
2.2
95
µA
IN-SH
EN/UVLO
MODE = unconnected,
FB/V = 1.03 x FB/V
I
160
4
µA
Q-PFM
InputꢀSupplyꢀCurrent
OUT
OUT-REG
I
Normal switching mode, V = 24V
2.5
mA
Q-PWM
IN
ENABLE/UVLO (EN/UVLO)
V
V
V
rising
1.19
1.06
1.215
1.09
0.75
1.24
1.15
ENR
EN/UVLO
EN/UVLO Threshold
V
falling
V
ENF
EN/UVLO
V
V
falling, true shutdown
EN-TRUESD EN/UVLO
EN/UVLOꢀInputꢀLeakageꢀCurrent
I
V
= 60V, T = +25°C
-100
+100
nA
EN/UVLO
EN/UVLO
A
LDO (V
)
CC
V
V
V
ꢀOutputꢀVoltageꢀRange
Current Limit
V
6V < V ꢀ<ꢀ60V,ꢀ0mAꢀ<ꢀI < 10mA
VCC
4.75
13
5
5.25
50
V
mA
V
CC
CC
CC
CC
IN
I
V
V
V
V
= 4.3V, V = 12V
30
VCC-MAX
CC
INꢀ
Dropout
V
=ꢀ4.5V,ꢀI = 5mA
VCC
0.15
4.18
3.8
0.3
CC-DO
INꢀ
CC
CC
V
rising
falling
4.05
3.7
4.3
CC-UVR
V
UVLO
V
CC
V
3.95
CC-UVF
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MAX15062
60V, 300mA, Ultra-Small, High-Efficiency,
Synchronous Step-Down DC-DC Converters
Electrical Characteristics (continued)
(V = 24V, V
= 0V, C = C
= 1µF, V
= 1.5V, LX = MODE = RESET = unconnected; T = T = -40°C to +125°C, unless
IN
GND
IN
VCC
EN/UVLO A J
otherwise noted. Typical values are at T ꢀ=ꢀ+25°C.ꢀAllꢀvoltagesꢀareꢀreferencedꢀtoꢀGND,ꢀunlessꢀotherwiseꢀnoted.)ꢀ(Noteꢀ2)
A
PARAMETER
POWER MOSFETs
SYMBOL
CONDITIONS
MIN
TYP
1.35
0.45
MAX
UNITS
T
T
T
T
= +25°C
1.75
2.7
A
A
A
A
I
= 0.3A
LX
High-SideꢀpMOSꢀOn-Resistance
R
Ω
DS-ONH
(sourcing)
= T = +125°C
J
= +25°C
0.55
0.9
I
= 0.3A
LX
Low-SideꢀnMOSꢀOn-Resistance
R
Ω
DS-ONL
(sinking)
= T = +125°C
J
V
V
= 0V, V = 60V, T = +25°C,
INꢀ A
EN/UVLO
LX Leakage Current
I
-1
+1
µA
LX-LKG
= (V
+ 1V) to (V - 1V)
LX
GND
IN
SOFT-START (SS)
Soft-Start Time
t
4.1
ms
SS
FEEDBACK (FB)
MODEꢀ=ꢀGND,ꢀMAX15062C
MODE = unconnected, MAX15062C
MAX15062C
0.887
0.887
-100
0.9
0.915
-25
0.913
0.936
FBꢀRegulationꢀVoltage
V
V
FB-REG
FB Leakage Current
I
nA
FB
OUTPUT VOLTAGE (V
)
OUT
MODEꢀ=ꢀGND,ꢀMAX15062A
3.25
3.25
4.93
4.93
3.3
3.35
5
3.35
3.42
5.07
5.18
MODE = unconnected, MAX15062A
MODEꢀ=ꢀGND,ꢀMAX15062B
V
ꢀRegulationꢀVoltage
V
V
OUT
OUT-REG
MODE = unconnected, MAX15062B
5.08
CURRENT LIMIT
Peak Current-Limit Threshold
I
0.49
0.58
0.25
0.56
0.66
0.62
0.73
0.35
A
A
PEAK-LIMIT
I
RUNAWAY-
LIMIT
RunawayꢀCurrent-LimitꢀThreshold
MODEꢀ=ꢀGND
0.3
A
mA
A
Negative Current-Limit Threshold
I
SINK-LIMIT
0.01
0.13
PFM Current Level
TIMING
I
PFM
Switching Frequency
f
465
500
1
535
kHz
SW
EventsꢀtoꢀHiccupꢀAfterꢀCrossingꢀ
RunawayꢀCurrentꢀLimit
Cycles
FB/V
toꢀCauseꢀHiccup
Undervoltage Trip Level
OUT
62.5
64.5
66.5
%
HiccupꢀTimeout
131
90
ms
ns
%
Minimum On-Time
Maximum Duty Cycle
t
130
94
ON-MIN
D
FB/V
= 0.98 x FB/V
OUT-REG
89
91.5
MAX
OUT
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MAX15062
60V, 300mA, Ultra-Small, High-Efficiency,
Synchronous Step-Down DC-DC Converters
Electrical Characteristics (continued)
(V = 24V, V
= 0V, C = C
= 1µF, V
= 1.5V, LX = MODE = RESET = unconnected; T = T = -40°C to +125°C, unless
IN
GND
IN
VCC
EN/UVLO A J
otherwise noted. Typical values are at T ꢀ=ꢀ+25°C.ꢀAllꢀvoltagesꢀareꢀreferencedꢀtoꢀGND,ꢀunlessꢀotherwiseꢀnoted.)ꢀ(Noteꢀ2)
A
PARAMETER
LX Dead Time
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
5
ns
RESET
FB/V
Rising
Threshold for RESET
Threshold for RESET
OUT
FB/V
FB/V
rising
93.5
90
95.5
92
2
97.5
94
%
%
OUT
FB/V
OUT
falling
OUT
Falling
RESET Delay After FB/V
OUT
ms
Reachesꢀ95%ꢀRegulation
RESET Output Level Low
RESET Output Leakage Current
MODE
I
= 5mA
0.2
0.1
V
RESET
V
= 5.5V, T = +25°C
µA
RESET
A
MODEꢀInternalꢀPullupꢀResistor
THERMAL SHUTDOWN
Thermal-Shutdown Threshold
Thermal-ShutdownꢀHysteresis
500
kΩ
Temperature rising
166
10
°C
°C
Note 2: All the limits are 100% tested at T = +25°C. Limits over temperature are guaranteed by design.
A
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MAX15062
60V, 300mA, Ultra-Small, High-Efficiency,
Synchronous Step-Down DC-DC Converters
Typical Operating Characteristics
(V = 24V, V
= 0V, C = C
= 1µF, V
= 1.5V, T = +25°C, unless otherwise noted.)
A
IN
GND
IN
VCC
EN/UVLO
EFFICIENCY vs. LOAD CURRENT
EFFICIENCY vs. LOAD CURRENT
EFFICIENCY vs. LOAD CURRENT
toc02a
100
100
90
80
70
60
50
40
30
100
90
80
70
60
50
40
V
= 12V
VIN = 6V
IN
V
= 12V
IN
VIN = 12V
90
80
70
60
50
40
30
20
V
IN
= 24V
V
IN
= 24V
VIN = 24V
VIN = 36V
V
= 36V
IN
V
IN
= 36V
VIN = 48V
FIGURE 7 APPLICATION
CIRCUIT, PFM MODE
FIGURE 5 APPLICATION
CIRCUIT, PFM MODE
= 3.3V
FIGURE 6 APPLICATION
CIRCUIT, PFM MODE
V
= 48V
IN
V
IN
= 48V
V
= 2.5V
OUT
V
V
OUT
= 5V
OUT
30
1
1
10
LOAD CURRENT (mA)
100
10
100
1
10
100
LOAD CURRENT (mA)
LOAD CURRENT (mA)
EFFICIENCY vs. LOAD CURRENT
EFFICIENCY vs. LOAD CURRENT
EFFICIENCY vs. LOAD CURRENT
toc02b
100
90
80
70
60
50
40
30
20
10
100
100
90
80
70
60
50
40
VIN = 24V
V = 12V
IN
90
80
70
60
50
40
30
20
10
0
VIN = 18V
V
IN
= 12V
V
= 24V
IN
V
= 24V
IN
V
= 36V
V
= 36V
IN
IN
VIN = 36V
VIN = 48V
V
IN
= 48V
V
IN
= 48V
VIN = 60V
FIGURE 8 APPLICATION
CIRCUIT, PFM MODE
FIGURE 5 APPLICATION
CIRCUIT, PWM MODE
FIGURE 6 APPLICATION
CIRCUIT, PWM MODE
V
= 12V
OUT
V
= 3.3V
V
OUT
= 5V
OUT
0
0
50
100
150
200
250
300
0
50
100
150
200
250
300
1
10
LOAD CURRENT (mA)
100
LOAD CURRENT (mA)
LOAD CURRENT (mA)
OUTPUT VOLTAGE
vs. LOAD CURRENT
EFFICIENCY vs. LOAD CURRENT
EFFICIENCY VS. LOAD CURRENT
toc04a
toc04b
100
90
80
70
60
50
40
30
20
10
0
3.37
3.36
3.35
3.34
3.33
3.32
3.31
3.30
3.29
100
90
80
70
60
50
40
30
20
10
VIN = 6V
FIGURE 5 APPLICATION
CIRCUIT, PFM MODE
VIN = 18V
VIN = 24V
V
= 12V, 24V
IN
VIN = 12V
VIN = 24V
VIN = 36V
V
= 36V
IN
V
VIN = 36V
VIN = 48V
VIN = 48V
VIN = 60V
= 48V
IN
FIGURE 7 APPLICATION
CIRCUIT, PWM MODE
FIGURE 8 APPLICATION
CIRCUIT, PWM MODE
V
= 2.5V
OUT
V
= 12V
OUT
0
0
0
50
100
150
200
250
300
0
50
100
150
200
250
300
50
100
150
200
250
300
LOAD CURRENT (mA)
LOAD CURRENT (mA)
LOAD CURRENT (mA)
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MAX15062
60V, 300mA, Ultra-Small, High-Efficiency,
Synchronous Step-Down DC-DC Converters
Typical Operating Characteristicsc (continued)
(V = 24V, V
= 0V, C = C
= 1µF, V
= 1.5V, T = +25°C, unless otherwise noted.)
A
IN
GND
IN
VCC
EN/UVLO
OUTPUT VOLTAGE
vs. LOAD CURRENT
OUTPUT VOLTAGE
vs. LOAD CURRENT
OUTPUT VOLTAGE
vs. LOAD CURRENT
toc06b
toc06a
5.10
5.08
5.06
5.04
5.02
5.00
4.98
2.54
2.53
2.52
2.51
2.50
2.49
2.48
12.35
FIGURE 6 APPLICATION
CIRCUIT, PFM MODE
FIGURE 8 APPLICATION
CIRCUIT, PFM MODE
FIGURE 7 APPLICATION
CIRCUIT, PFM MODE
12.30
12.25
VIN = 18V
VIN = 24V
VIN = 36V
VIN = 12V
V
IN
= 24V
12.20
12.15
12.10
12.05
12.00
VIN = 6V,24V
VIN = 36V
V
= 12V, 36V, 48V
IN
VIN = 48V
VIN = 48V,60V
2.47
0
0
50
100
150
200
250
300
50
100
150
200
250
300
0
50
100
150
200
250
300
LOAD CURRENT (mA)
LOAD CURRENT (mA)
LOAD CURRENT (mA)
OUTPUT VOLTAGE
vs. LOAD CURRENT
OUTPUT VOLTAGE
vs. LOAD CURRENT
FEEDBACK VOLTAGE
vs. LOAD CURRENT
toc06c
0.920
0.915
0.910
0.905
0.900
0.895
3.303
3.302
3.301
3.300
3.299
3.298
3.297
5.003
5.002
5.001
5.000
4.999
4.998
4.997
PFM MODE
FIGURE 5 APPLICATION
CIRCUIT, PWM MODE
FIGURE 6 APPLICATION
CIRCUIT, PWM MODE
V
= 48V
IN
VIN = 12V
V
= 36V
IN
V
= 48V
IN
VIN = 6V, 24V
V
= 36V
IN
VIN = 36V
VIN = 48V
V
IN
= 24V
100
V
IN
= 12V
V
IN
= 12V
V
= 24V
200
IN
0
50
150
200
250
300
0
50
100
150
250
300
0
50
100
150
200
250
300
LOAD CURRENT (mA)
LOAD CURRENT (mA)
LOAD CURRENT (mA)
OUTPUT VOLTAGE
vs. TEMPERATURE
OUTPUT VOLTAGE vs. TEMPERATURE
5.04
5.02
5.00
4.98
4.96
4.94
3.32
3.31
3.30
3.29
3.28
3.27
FIGURE 6 APPLICATION
CIRCUIT, LOAD = 300mA
FIGURE 5 APPLICATION
CIRCUIT, LOAD = 300mA
-40 -20
0
20 40 60 80 100 120
TEMPERATURE (°C)
-40 -20
0
20 40 60 80 100 120
TEMPERATURE (°C)
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MAX15062
60V, 300mA, Ultra-Small, High-Efficiency,
Synchronous Step-Down DC-DC Converters
Typical Operating Characteristicsc (continued)
(V = 24V, V
= 0V, C = C
= 1µF, V
= 1.5V, T = +25°C, unless otherwise noted.)
IN
GND
IN
VCC
EN/UVLO A
FEEDBACK VOLTAGE
VS. TEMPERATURE
NO-LOAD SUPPLY CURRENT
vs. INPUT VOLTAGE
toc10a
100
98
96
94
92
90
0.908
0.904
0.900
0.896
0.892
0.888
0.884
0.880
PFM MODE
5
5
5
15
25
35
45
55
-40 -20
0
20 40 60 80 100 120
INPUT VOLTAGE (V)
TEMPERATURE (°C)
NO-LOAD SUPPLY CURRENT
vs. TEMPERATURE
SHUTDOWN CURRENT
vs. INPUT VOLTAGE
140
130
120
110
100
90
6
5
4
3
2
1
0
80
70
PFM MODE
60
-40 -20
0
20 40 60 80 100 120
TEMPERATURE (°C)
15
25
35
45
55
INPUT VOLTAGE (V)
SHUTDOWN CURRENT
vs. TEMPERATURE
SWITCH CURRENT LIMIT
vs. INPUT VOLTAGE
600
550
500
450
400
350
300
250
200
2.40
2.25
2.10
1.95
1.80
1.65
1.50
SWITCH PEAK CURRENT LIMIT
SWITCH NEGATIVE CURRENT LIMIT
15
25
35
45
55
-40 -20
0
20 40 60 80 100 120
TEMPERATURE (°C)
INPUT VOLTAGE (V)
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MAX15062
60V, 300mA, Ultra-Small, High-Efficiency,
Synchronous Step-Down DC-DC Converters
Typical Operating Characteristicsc (continued)
(V = 24V, V
= 0V, C = C
= 1µF, V
= 1.5V, T = +25°C, unless otherwise noted.)
IN
GND
IN
VCC
EN/UVLO A
EN/UVLO THRESHOLD
vs. TEMPERATURE
SWITCH CURRENT LIMIT
vs. TEMPERATURE
600
550
500
450
400
350
300
250
200
1.24
1.22
1.20
1.18
1.16
1.14
1.12
1.10
1.08
RISING
SWITCH PEAK CURRENT LIMIT
SWITCH NEGATIVE CURRENT LIMIT
FALLING
-40 -20
0
20 40 60 80 100 120
TEMPERATURE (°C)
-40 -20
0
20 40 60 80 100 120
TEMPERATURE (°C)
SWITCHING FREQUENCY
vs. TEMPERATURE
RESET THRESHOLD
vs. TEMPERATURE
98
97
96
95
94
93
92
91
90
560
540
520
500
480
460
RISING
FALLING
440
0
10
20
30
40
50
60
-40 -20
0
20 40 60 80 100 120
TEMPERATURE (°C)
TEMPERATURE (°C)
LOAD TRANSIENT RESPONSE,
LOAD TRANSIENT RESPONSE,
PFM MODE (LOAD CURRENT STEPPED
PFM MODE (LOAD CURRENT STEPPED
FROM 5mA TO 150mA)
FROM 5mA TO 150mA)
MAX15062 toc20
MAX15062 toc21
V
OUT
(AC)
100mV/div
V
OUT
(AC)
100mV/div
FIGURE 5
FIGURE 6
APPLICATION CIRCUIT
APPLICATION CIRCUIT
V
OUT
= 3.3V
V
OUT
= 5V
I
I
OUT
OUT
100mA/div
100mA/div
100µs/div
100µs/div
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MAX15062
60V, 300mA, Ultra-Small, High-Efficiency,
Synchronous Step-Down DC-DC Converters
Typical Operating Characteristicsc (continued)
(V = 24V, V
= 0V, C = C
= 1µF, V
= 1.5V, T = +25°C, unless otherwise noted.)
IN
GND
IN
VCC
EN/UVLO A
LOAD TRANSIENT RESPONSE
PFM MODE (LOAD CURRENT STEPPED
FROM 5mA TO 150mA)
LOAD TRANSIENT RESPONSE,
PFM MODE (LOAD CURRENT STEPPED
FROM 5mA TO 150mA)
toc21b
toc21a
VOUT (AC)
VOUT (AC)
100mV/div
200mV/div
FIGURE 8
APPLICATION CIRCUIT
FIGURE 7
APPLICATION CIRCUIT
V
OUT = 2.5V
V
= 12V
OUT
IOUT
IOUT
100mA/div
100mA/div
100µs/div
100µs/div
LOAD TRANSIENT RESPONSE,
LOAD TRANSIENT RESPONSE,
PFM OR PWM MODE (LOAD CURRENT
PFM OR PWM MODE (LOAD CURRENT
STEPPED FROM 150mA TO 300mA)
STEPPED FROM 150mA TO 300mA)
MAX15062 toc22
MAX15062 toc23
V
OUT
(AC)
V
OUT
(AC)
100mV/div
100mV/div
I
OUT
I
OUT
100mA/div
100mA/div
FIGURE 5
FIGURE 6
APPLICATION CIRCUIT
APPLICATION CIRCUIT
V
OUT
= 3.3V
V
OUT
= 5V
40µs/div
LOAD TRANSIENT RESPONSE
PFM OR PWM MODE (LOAD CURRENT
STEPPED FROM 150mA TO 300mA)
40µs/div
LOAD TRANSIENT RESPONSE
PFM OR PWM MODE (LOAD CURRENT
STEPPED FROM 150mA TO 300mA)
toc23a
toc23b
VOUT (AC)
50mV/div
VOUT (AC)
200mV/div
IOUT
100mA/div
IOUT
FIGURE 7
APPLICATION CIRCUIT
FIGURE 8
APPLICATION CIRCUIT
100mA/div
V
= 2.5V
V
= 12V
OUT
OUT
40µs/div
40µs/div
MaximꢀIntegratedꢀꢀ
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MAX15062
60V, 300mA, Ultra-Small, High-Efficiency,
Synchronous Step-Down DC-DC Converters
Typical Operating Characteristicsc (continued)
(V = 24V, V
= 0V, C = C
= 1µF, V
= 1.5V, T = +25°C, unless otherwise noted.)
IN
GND
IN
VCC
EN/UVLO A
LOAD TRANSIENT RESPONSE,
PWM MODE (LOAD CURRENT
LOAD TRANSIENT RESPONSE,
PWM MODE PWM mode (LOAD CURRENT
STEPPED FROM NO LOAD TO 150mA)
STEPPED FROM NO LOAD TO 150mA)
MAX15062 toc24
MAX15062 toc25
V
OUT
(AC)
V
OUT
(AC)
100mV/div
100mV/div
FIGURE 5
FIGURE 6
APPLICATION CIRCUIT
APPLICATION CIRCUIT
V
OUT
= 3.3V
V
OUT
= 5V
I
I
OUT
OUT
100mA/div
100mA/div
40µs/div
LOAD TRANSIENT RESPONSE
40µs/div
LOAD TRANSIENT RESPONSE
PWM MODE (LOAD CURRENT STEPPED
PWM MODE (LOAD CURRENT STEPPED
FROM NO LOAD TO 150mA)
FROM NO LOAD TO 150mA)
toc25b
toc25a
VOUT (AC)
VOUT (AC)
50mV/div
200mV/div
FIGURE 8
APPLICATION CIRCUIT
FIGURE 7
APPLICATION CIRCUIT
V
= 12V
OUT
V
= 2.5V
OUT
IOUT
100mA/div
IOUT
100mA/div
40µs/div
40µs/div
FULL-LOAD SWITCHING WAVEFORMS
SWITCHING WAVEFORMS
(PFM MODE)
(PWM OR PFM MODE)
MAX15062 toc27
MAX15062 toc26
V
= 5V,
OUT
FIGURE 6 APPLICATION CIRCUIT
= 5V, LOAD = 20mA
LOAD = 300mA
V
OUT
V
(AC)
OUT
V
(AC)
OUT
20mV/div
100mV/div
V
LX
10V/div
V
LX
10V/div
I
OUT
I
OUT
200mA/div
100mA/div
2µs/div
10µs/div
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MAX15062
60V, 300mA, Ultra-Small, High-Efficiency,
Synchronous Step-Down DC-DC Converters
Typical Operating Characteristicsc (continued)
(V = 24V, V
= 0V, C = C
= 1µF, V
= 1.5V, T = +25°C, unless otherwise noted.)
IN
GND
IN
VCC
EN/UVLO A
NO-LOAD SWITCHING WAVEFORMS
(PWM MODE)
SOFT-START
MAX15062 toc28
MAX15062 toc29
V
= 5V
OUT
V
EN/UVLO
5V/div
V
OUT
(AC)
20mV/div
V
LX
V
OUT
10V/div
1V/div
FIGURE 5
APPLICATION CIRCUIT
= 3.3V
V
OUT
I
OUT
I
OUT
100mA/div
100mA/div
V
RESET
5V/div
2µs/div
1ms/div
SOFT-START
SOFT-START
toc30a
MAX15062 toc30
VEN/UVLO
5V/div
V
EN/UVLO
5V/div
VOUT
1V/div
IOUT
V
OUT
100mA/div
1V/div
FIGURE 6
FIGURE 7
APPLICATION CIRCUIT
APPLICATION CIRCUIT
= 5V
V
OUT
I
V
= 2.5V
OUT
OUT
VRESET
5V/div
100mA/div
V
RESET
5V/div
1ms/div
1ms/div
SOFT-START
SHUTDOWN WITH ENABLE
MAX15062 toc31
toc30b
VEN/UVLO
5V/div
V
EN/UVLO
5V/div
V
OUT
VOUT
5V/div
1V/div
I
OUT
100mA/div
IOUT
100mA/div
FIGURE 8
APPLICATION CIRCUIT
V
= 12V
OUT
V
RESET
5V/div
VRESET
5V/div
400µs/div
1ms/div
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MAX15062
60V, 300mA, Ultra-Small, High-Efficiency,
Synchronous Step-Down DC-DC Converters
Typical Operating Characteristicsc (continued)
(V = 24V, V
= 0V, C = C
= 1µF, V
= 1.5V, T = +25°C, unless otherwise noted.)
IN
GND
IN
VCC
EN/UVLO A
SOFT-START WITH 3V PREBIAS
OVERLOAD PROTECTION
MAX15062 toc33
MAX15062 toc32
V
V
IN
20V/div
EN/UVLO
5V/div
V
OUT
V
OUT
1V/div
2V/div
FIGURE 6
APPLICATION CIRCUIT
NO LOAD
PWM MODE
I
OUT
200mA/div
V
RESET
5V/div
1ms/div
20ms/div
BODE PLOT
BODE PLOT
MAX15062 toc34
MAX15062 toc35
50
40
180
144
108
72
50
40
180
144
108
72
GAIN
GAIN
30
30
PHASE
PHASE
20
20
10
36
10
36
0
0
0
0
f
= 47kHz,
f
= 47kHz,
CR
CR
-10
-20
-30
-40
-50
-36
-72
-108
-144
-180
-10
-20
-30
-40
-50
-36
-72
-108
-144
-180
PHASE MARGIN = 59°
PHASE MARGIN = 60°
FIGURE 5 APPLICATION CIRCUIT
= 3.3V
FIGURE 6 APPLICATION CIRCUIT
V = 5V
OUT
V
OUT
2
4
6 8 1
10k
2
4
6 8 1
100k
2
2
4
6 8 1
10k
2
4
6 8 1
100k
2
1k
1k
FREQUENCY (Hz)
FREQUENCY (Hz)
BODE PLOT
BODE PLOT
MAX15062 toc35b
MAX15062 toc35a
50
40
180
144
108
72
50
40
180
144
108
72
GAIN
GAIN
30
30
20
20
PHASE
PHASE
10
36
10
36
0
0
0
0
f
= 43kHz,
CR
f
= 36kHz,
CR
PHASE MARGIN = 60°
-10
-20
-30
-40
-50
-36
-72
-108
-144
-180
-10
-20
-30
-40
-50
-36
-72
-108
-144
-180
PHASE MARGIN = 66°
FIGURE 7 APPLICATION CIRCUIT
= 2.5V
FIGURE 8 APPLICATION CIRCUIT
V
OUT
V
= 12V
OUT
1k
10k
100k
1k
10k
100k
FREQUENCY (Hz)
FREQUENCY (Hz)
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MAX15062
60V, 300mA, Ultra-Small, High-Efficiency,
Synchronous Step-Down DC-DC Converters
Pin Configuration
TOP VIEW
LX
8
GND RESET MODE
5
7
6
MAX15062
1
2
3
4
FB/V
+
V
EN/UVLO
V
CC
IN
OUT
TDFN
(2mm x 2mm)
Pin Description
PIN
NAME
FUNCTION
1
V
SwitchingꢀRegulatorꢀPowerꢀInput.ꢀConnectꢀaꢀX7Rꢀ1µFꢀceramicꢀcapacitorꢀfromꢀV ꢀtoꢀGNDꢀforꢀbypassing.ꢀ
IN
IN
Active-High,ꢀEnable/Undervoltage-DetectionꢀInput.ꢀPullꢀEN/UVLOꢀtoꢀGNDꢀtoꢀdisableꢀtheꢀregulatorꢀoutput.ꢀ
2
3
4
EN/UVLO Connect EN/UVLO to V for always-on operation. Connect a resistor-divider between V and EN/UVLO
IN
IN
toꢀGNDꢀtoꢀprogramꢀtheꢀinputꢀvoltageꢀatꢀwhichꢀtheꢀdeviceꢀisꢀenabledꢀandꢀturnsꢀon.
V
InternalꢀLDOꢀPowerꢀOutput.ꢀBypassꢀV ꢀtoꢀGNDꢀwithꢀaꢀminimumꢀ1µFꢀcapacitor.
CC
CC
FeedbackꢀInput.ꢀForꢀfixedꢀoutputꢀvoltageꢀversions,ꢀconnectꢀFB/V
directly to the output. For the
OUT
FB/V
adjustable output voltage version, connect FB/V
to a resistor-divider between V
ꢀandꢀGNDꢀtoꢀ
OUT
OUT
OUT
adjust the output voltage from 0.9V to 0.89 x V
.
IN
PFM/PWMꢀModeꢀSelectionꢀInput.ꢀConnectꢀMODEꢀtoꢀGNDꢀtoꢀenableꢀtheꢀfixed-frequencyꢀPWMꢀoperation.ꢀ
Leave unconnected for light-load PFM operation.
5
6
MODE
Open-DrainꢀResetꢀOutput.ꢀPullꢀupꢀRESET to an external power supply with an external resistor.
RESET goes low when the output voltage drops below 92% of the set nominal regulated voltage. RESET
goes high impedance 2ms after the output voltage rises above 95% of its regulation value. See the
Electrical Characteristics table for threshold values.
RESET
Ground.ꢀConnectꢀGNDꢀtoꢀtheꢀpowerꢀgroundꢀplane.ꢀConnectꢀallꢀtheꢀcircuitꢀgroundꢀconnectionsꢀtogetherꢀatꢀ
a single point. See the PCB Layout Guidelines section.
7
8
GND
InductorꢀConnection.ꢀConnectꢀLXꢀtoꢀtheꢀswitchingꢀsideꢀofꢀtheꢀinductor.ꢀLXꢀisꢀhighꢀimpedanceꢀwhenꢀtheꢀ
device is in shutdown.
LX
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MAX15062
60V, 300mA, Ultra-Small, High-Efficiency,
Synchronous Step-Down DC-DC Converters
Block Diagram
V
IN
LDO
REGULATOR
PEAK-LIMIT
RUNAWAY-
LIMIT
CURRENT-
SENSE
LOGIC
CURRENT-
SENSE
AMPLIFIER
V
CC
CS
PFM
MAX15062
POK
EN/UVLO
DH
HIGH-SIDE
DRIVER
CHIPEN
CLK
1.215V
THERMAL
SHUTDOWN
LX
V
CC
OSCILLATOR
SLOPE
500kΩ
MODE
DL
PFM/PWM
CONTROL
LOGIC
LOW-SIDE
DRIVER
MODE SELECT
0.55V
CC
SLOPE
CS
R1
*
LOW-SIDE
CURRENT
SENSE
SINK-LIMIT
PWM
FB/V
OUT
NEGATIVE
CURRENT
REF
ERROR
AMPLIFIER
GND
R2
3.135V FOR MAX15062A
4.75V FOR MAX15062B
0.859V FOR MAX15062C
CLK
RESET
REFERENCE
SOFT-START
2ms
DELAY
FB/V
OUT
*RESISTOR-DIVIDER ONLY FOR MAX15062A, MAX15062B
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MAX15062
60V, 300mA, Ultra-Small, High-Efficiency,
Synchronous Step-Down DC-DC Converters
tive applications and provides fixed switching frequency
atꢀallꢀloads.ꢀHowever,ꢀtheꢀPWMꢀmodeꢀofꢀoperationꢀgivesꢀ
lower efficiency at light loads compared to PFM mode of
operation.
Detailed Description
The MAX15062 high-efficiency, high-voltage, syn-
chronous step-down DC-DC converter with integrated
MOSFETs operates over a wide 4.5V to 60V input voltage
range. The converter delivers output current up to 300mA
at 3.3V (MAX15062A), 5V (MAX15062B), and adjustable
output voltages (MAX15062C). When EN/UVLO and
PFM Mode Operation
PFM mode operation disables negative inductor
current and additionally skips pulses at light loads for high
efficiency.ꢀInꢀPFMꢀmode,ꢀtheꢀinductorꢀcurrentꢀisꢀforcedꢀtoꢀ
a fixed peak of 130mA every clock cycle until the output
rises to 102.3% of the nominal voltage. Once the output
reaches 102.3% of the nominal voltage, both high-side
and low-side FETs are turned off and the part enters
hibernate operation until the load discharges the output
to 101.1% of the nominal voltage. Most of the internal
blocks are turned off in hibernate operation to save
quiescent current. After the output falls below 101.1%
of the nominal voltage, the device comes out of hiber-
nate operation, turns on all internal blocks, and again
commences the process of delivering pulses of energy
to the output until it reaches 102.3% of the nomi-
nal output voltage. The device naturally exits PFM
mode when the load current exceeds 55mA
(typ). The advantage of the PFM mode is higher
efficiency at light loads because of lower quiescent
current drawn from supply.
V
CC
UVLO are satisfied, an internal power-up sequence
soft-starts the error-amplifier reference, resulting in a
clean monotonic output-voltage soft-start independent of
the load current. The FB/V
pin monitors the output
OUT
voltage through a resistor-divider. RESET transitions
to a high-impedance state 2ms after the output voltage
reaches 95% of regulation. The device selects either
PFM or forced-PWM mode depending on the state of the
MODE pin at power-up. By pulling the EN/UVLO pin to
low, the device enters the shutdown mode and consumes
only 2.2µA (typ) of standby current.
DC-DC Switching Regulator
The device uses an internally compensated, fixed-fre-
quency, current-mode control scheme (see the Block
Diagram). On the rising edge of an internal clock, the
high-side pMOSFET turns on. An internal error amplifier
compares the feedback voltage to a fixed internal refer-
ence voltage and generates an error voltage. The error
voltage is compared to a sum of the current-sense voltage
and a slope-compensation voltage by a PWM comparator
to set the on-time. During the on-time of the pMOSFET,
the inductor current ramps up. For the remainder of the
switching period (off-time), the pMOSFET is kept off and
the low-side nMOSFET turns on. During the off-time, the
inductor releases the stored energy as the inductor current
ramps down, providing current to the output. Under over-
load conditions, the cycle-by-cycle current-limit feature
limits the inductor peak current by turning off the high-side
pMOSFET and turning on the low-side nMOSFET.
Internal 5V Linear Regulator
An internal regulator provides a 5V nominal supply to
power the internal functions and to drive the power
MOSFETs. The output of the linear regulator (V ) should
CC
beꢀbypassedꢀwithꢀaꢀ1µFꢀcapacitorꢀtoꢀGND.ꢀTheꢀV
regu-
CC
lator dropout voltage is typically 150mV. An undervoltage-
lockout circuit that disables the regulator when V falls
CC
below 3.8V (typ). The 400mV V
UVLO hysteresis pre-
CC
vents chattering on power-up and power-down.
Enable Input (EN/UVLO), Soft-Start
When EN/UVLO voltage is above 1.21V (typ), the device’s
internal error-amplifier reference voltage starts to ramp
up. The duration of the soft-start ramp is 4.1ms, allowing a
smooth increase of the output voltage. Driving EN/UVLO
low disables both power MOSFETs, as well as other inter-
Mode Selection (MODE)
The logic state of the MODE pin is latched after V
CC
and EN/UVLO voltages exceed respective UVLO rising
thresholds and all internal voltages are ready to allow
LXꢀꢀswitching.ꢀIfꢀtheꢀMODEꢀꢀpinꢀisꢀunconnectedꢀatꢀpower-
up,ꢀtheꢀpartꢀoperatesꢀinꢀPFMꢀmodeꢀatꢀlightꢀloads.ꢀIfꢀtheꢀ
MODE pin is grounded at power-up, the part operates in
constant-frequency PWM mode at all loads. State chang-
es on the MODE pin are ignored during normal operation.
nal circuitry, and reduces V quiescent current to below
IN
2.2µA. EN/UVLO can be used as an input-voltage UVLO
adjustment input. An external voltage-divider between V
IN
andꢀEN/UVLOꢀtoꢀGNDꢀadjustsꢀtheꢀinputꢀvoltageꢀatꢀwhichꢀ
theꢀdeviceꢀturnsꢀonꢀorꢀturnsꢀoff.ꢀIfꢀinputꢀUVLOꢀprogram-
ming is not desired, connect EN/UVLO to V (see the
Electrical Characteristics table for EN/UVLO rising and
falling threshold voltages).
IN
PWM Mode Operation
Inꢀ PWMꢀ mode,ꢀ theꢀ inductorꢀ currentꢀ isꢀ allowedꢀ toꢀ goꢀ
negative. PWM operation is useful in frequency sensi-
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MAX15062
60V, 300mA, Ultra-Small, High-Efficiency,
Synchronous Step-Down DC-DC Converters
to a fault condition, output voltage drops to 65% (typ) of
its nominal value any time after soft-start is complete,
Reset Output (RESET)
The device includes an open-drain RESET output to
monitor the output voltage. RESET goes high impedance
2ms after the output rises above 95% of its nominal set
value and pulls low when the output voltage falls below
92% of the set nominal regulated voltage. RESET asserts
low during the hiccup timeout period.
hiccupꢀmodeꢀisꢀtriggered.ꢀInꢀhiccupꢀmode,ꢀtheꢀconverterꢀ
is protected by suspending switching for a hiccup timeout
period of 131ms. Once the hiccup timeout period expires,
soft-startꢀ isꢀ attemptedꢀ again.ꢀ Hiccupꢀ modeꢀ ofꢀ operationꢀ
ensures low power dissipation under output short-circuit
conditions.
Startup into a Prebiased Output
Care should be taken in board layout and system wiring
to prevent violation of the absolute maximum rating of the
The device is capable of soft-start into a prebiased out-
put, without discharging the output capacitor in both the
PFM and forced-PWM modes. Such a feature is useful in
applications where digital integrated circuits with multiple
rails are powered.
FB/V
pin under short-circuit conditions. Under such
OUT
conditions, it is possible for the ceramic output capacitor
to oscillate with the board or wiring inductance between
the output capacitor or short-circuited load, thereby caus-
ing the absolute maximum rating of FB/V
(-0.3V) to
OUT
Operating Input Voltage Range
be exceeded. The parasitic board or wiring inductance
shouldꢀ beꢀ minimizedꢀ andꢀ theꢀ outputꢀ voltageꢀ waveformꢀ
under short-circuit operation should be verified to ensure
The maximum operating input voltage is determined by
the minimum controllable on-time and the minimum oper-
ating input voltage is determined by the maximum duty
cycle and circuit voltage drops. The minimum and maxi-
mum operating input voltages for a given output voltage
should be calculated as follows:
the absolute maximum rating of FB/V
is not exceeded.
OUT
Thermal Overload Protection
Thermal overload protection limits the total power dis-
sipation in the device. When the junction temperature
exceeds +166°C, an on-chip thermal sensor shuts down
the device, turns off the internal power MOSFETs, allow-
ing the device to cool down. The thermal sensor turns the
device on after the junction temperature cools by 10°C.
V
+ (I
×(R
+ 0.5))
DCR
OUT
OUT
D
V
=
+ (I
×1.0)
OUT
INMIN
MAX
V
OUT
V
=
INMAX
t
× f
ONMIN SW
Applications Information
where V
theꢀmaximumꢀloadꢀcurrent,ꢀR
the inductor, f
is maximum duty cycle (0.9), and t
ꢀisꢀtheꢀsteady-stateꢀoutputꢀvoltage,ꢀI
is
OUT
OUT
is the DC resistance of
DCR
Inductor Selection
A low-loss inductor having the lowest possible DC resis-
tance that fits in the allotted dimensions should be selected.
is the switching frequency (max), D
SW
MAX
is the worst-
ONMIN
case minimum controllable switch on-time (130ns).
Theꢀ saturationꢀ currentꢀ (I ) must be high enough to
SAT
ensure that saturation cannot occur below the maximum
current-limitꢀvalueꢀ(I ) of 0.56A (typ). The required
inductance for a given application can be determined from
the following equation:
Overcurrent Protection/Hiccup Mode
PEAK-LIMIT
The device is provided with a robust overcurrent
protection scheme that protects the device under over-
load and output short-circuit conditions. A cycle-by-cycle
peak current limit turns off the high-side MOSFET when-
ever the high-side switch current exceeds an internal limit
of 0.56A (typ). A runaway current limit on the high-side
switch current at 0.66A (typ) protects the device under
high input voltage, and short-circuit conditions when
there is insufficient output voltage available to restore the
inductor current that was built up during the on period of
the step-down converter. One occurrence of the runaway
currentꢀ limitꢀ triggersꢀ aꢀ hiccupꢀ mode.ꢀ Inꢀ addition,ꢀ ifꢀ dueꢀ
L = 9.3 x V
OUT
whereꢀLꢀisꢀinductanceꢀinꢀµHꢀandꢀV
is output voltage.
OUT
Once the L value is known, the next step is to select the
right core material. Ferrite and powdered iron are com-
monly available core materials. Ferrite cores have low
core losses and are preferred for high-efficiency designs.
Powdered iron cores have more core losses and are rela-
tively cheaper than ferrite cores. See Table 1 to select the
inductors for typical applications.
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MAX15062
60V, 300mA, Ultra-Small, High-Efficiency,
Synchronous Step-Down DC-DC Converters
Table 1. Inductor Selection
INPUT VOLTAGE
V
(V)
I
(mA)
L (µH)
RECOMMENDED PART NO.
Coilcraft LPS4018-333ML
OUT
OUT
RANGE V (V)
IN
4.5 to 60
6 to 60
3.3 (Fixed)
5 (Fixed)
1.8 or 2.5
12
300
33
47
300
300
300
300
Coilcraft LPS4018-473ML
Coilcraft LPS4018-223ML
Wurth 74408943101
4.5 to 60
14 to 60
17 to 60
22
100
150
15
TDK VLC6045T-151M
Table 2. Output Capacitor Selection
INPUT VOLTAGE
V
(V)
I
(mA)
C (µF)
OUT
RECOMMENDED PART NO.
OUT
OUT
RANGE V (V)
IN
4.5 to 60
6 to 60
3.3 (Fixed)
5 (Fixed)
1.8 or 2.5
12
300
10µF/1206/X7R/6.3V
10µF/1206/X7R/6.3V
22µF/1206/X7R/6.3V
4.7µF/1206/X7R/16V
4.7µF/1206/X7R/25V
MurataꢀGRM31CR70J106K
MurataꢀGRM31CR70J106K
MurataꢀGRM31CR70J226K
MurataꢀGRM31CR71C475K
MurataꢀGRM31CR71E475K
300
300
300
300
4.5 to 60
14 to 60
17 to 60
15
conditionsꢀandꢀstabilizesꢀtheꢀdevice’sꢀinternalꢀcontrolꢀloop.ꢀ
Usuallyꢀ theꢀ outputꢀ capacitorꢀ isꢀ sizedꢀ toꢀ supportꢀ aꢀ stepꢀ
load of 50% of the maximum output current in the appli-
cation, such that the output-voltage deviation is less than
3%. The device requires a minimum of 10µF capacitance
forꢀ stability.ꢀ Requiredꢀ outputꢀ capacitanceꢀ canꢀ beꢀ calcu-
lated from the following equation:
V
IN
V
IN
MAX15062
EN/UVLO
R1
R2
30
C
=
OUT
V
OUT
Figure 1. Adjustable EN/UVLO Network
where C
is the output capacitance in µF and V
OUT
OUT
is the output voltage. See Table 2 to select the output
capacitor for typical applications.
Input Capacitor
Small ceramic capacitors are recommended for the
device. The input capacitor reduces peak current drawn
from the power source and reduces noise and voltage
ripple on the input caused by the switching circuitry. A
minimumꢀofꢀ1µF,ꢀX7R-gradeꢀcapacitorꢀinꢀaꢀpackageꢀlargerꢀ
than 0805 is recommended for the input capacitor of the
device to keep the input voltage ripple under 2% of the
minimum input voltage, and to meet the maximum ripple-
current requirements.
Setting the Input Undervoltage-Lockout Level
The devices offer an adjustable input undervoltage-
lockout level. Set the voltage at which the device turns
on with a resistive voltage-divider connected from V
IN
toꢀGNDꢀ(seeꢀFigure 1). Connect the center node of the
divider to EN/UVLO.
ChooseꢀR1ꢀtoꢀbeꢀ3.3MΩꢀmax,ꢀandꢀthenꢀcalculateꢀR2ꢀasꢀ
follows:
Output Capacitor
R1×1.215
R2 =
Smallꢀ ceramicꢀ X7R-gradeꢀ capacitorsꢀ areꢀ sufficientꢀ andꢀ
recommended for the device. The output capacitor has
twoꢀfunctions.ꢀItꢀfiltersꢀtheꢀsquareꢀwaveꢀgeneratedꢀbyꢀtheꢀ
deviceꢀalongꢀwithꢀtheꢀoutputꢀinductor.ꢀItꢀstoresꢀsufficientꢀ
energy to support the output voltage under load transient
(V
-1.215)
INU
where V
to turn on.
is the voltage at which the device is required
INU
MaximꢀIntegratedꢀꢀ
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MAX15062
60V, 300mA, Ultra-Small, High-Efficiency,
Synchronous Step-Down DC-DC Converters
Adjusting the Output Voltage
PCB Layout Guidelines
The MAX15062C output voltage can be programmed
Careful PCB layout is critical to achieve clean and stable
operation. The switching power stage requires particular
attention. Follow the guidelines below for good PCB layout.
from 0.9V to 0.89 x V . Set the output voltage by con-
IN
nectingꢀaꢀresistor-dividerꢀfromꢀoutputꢀtoꢀFBꢀtoꢀGNDꢀ(seeꢀ
Figure 2).
●ꢀ Placeꢀtheꢀinputꢀceramicꢀcapacitorꢀasꢀcloseꢀasꢀpossibleꢀ
Forꢀtheꢀoutputꢀvoltagesꢀlessꢀthanꢀ6V,ꢀchooseꢀR2ꢀinꢀtheꢀ
50kΩꢀ toꢀ 150kΩꢀ range.ꢀ Forꢀ theꢀ outputꢀ voltagesꢀ greaterꢀ
thanꢀ6V,ꢀchooseꢀR2ꢀinꢀtheꢀ25kΩꢀtoꢀ75kΩꢀrangeꢀandꢀcalcu-
lateꢀR1ꢀwithꢀtheꢀfollowingꢀequation:
to the V ꢀandꢀGNDꢀpins.
IN
●ꢀ Connectꢀ theꢀ negativeꢀ terminalꢀ ofꢀ theꢀ V
bypass
CC
capacitorꢀtoꢀtheꢀGNDꢀpinꢀwithꢀshortestꢀpossibleꢀtraceꢀorꢀ
ground plane.
●ꢀ MinimizeꢀtheꢀareaꢀformedꢀbyꢀtheꢀLXꢀpinꢀandꢀtheꢀinduc-
V
OUT
torꢀconnectionꢀtoꢀreduceꢀtheꢀradiatedꢀEMI.
R1 = R2 ×
− 1
0.9
●ꢀ PlaceꢀtheꢀV
decoupling capacitor as close as pos-
CC
sible to the V
pin.
CC
Power Dissipation
●ꢀ Ensureꢀ thatꢀ allꢀ feedbackꢀ connectionsꢀ areꢀ shortꢀ andꢀ
Ensure that the junction temperature of the device does
not exceed 125°C under the operating conditions speci-
fied for the power supply. At a particular operating condi-
tion, the power losses that lead to temperature rise of the
part are estimated as follows:
direct.
●ꢀ Routeꢀtheꢀhigh-speedꢀswitchingꢀnodeꢀ(LX)ꢀawayꢀfromꢀ
the FB/V , RESET, and MODE pins.
OUT
For a sample PCB layout that ensures the first-pass
success, refer to the MAX15062 evaluation kit layouts
available at www.maximintegrated.com.
1
2
P
= P
×
- 1 - (I
×R
)
DCR
LOSS
OUT
OUT
η
P
= V
×I
OUT OUT
OUT
V
OUT
where P
ꢀ isꢀ theꢀ outputꢀ power,ꢀ ηꢀ isꢀ theꢀ efficiencyꢀ ofꢀ
OUT
powerꢀconversion,ꢀandꢀR
is the DC resistance of the
DCR
R1
R2
output inductor. See the Typical Operating Characteristics
for the power-conversion efficiency or measure the effi-
ciency to determine the total power dissipation.
FB
MAX15062C
The junction temperature (T ) of the device can be esti-
J
mated at any ambient temperature (T ) from the following
A
GND
equation:
T = T + θ ×P
LOSS
(
)
J
A
JA
Figure 2. Setting the Output Voltage
whereꢀθ is the junction-to-ambient thermal impedance
JA
of the package.
MaximꢀIntegratedꢀꢀ
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MAX15062
60V, 300mA, Ultra-Small, High-Efficiency,
Synchronous Step-Down DC-DC Converters
L1
V
IN
V
V
OUT
LX
IN
C
IN
C
OUT
R1
R2
GND
EN/UVLO
MAX15062A/B
V
OUT
V
CC
V
CC
RESET
C
VCC
R3
MODE
V
CC
V
PLANE
IN
C
IN
U1
L1
LX
R1
V
IN
EN/UVLO
GND
RESET
C
OUT
V
CC
R2
V
OUT
C
VCC
MODE
V
OUT
PLANE
GND
PLANE
R3
VIAS TO V
VIAS TO V
VIAS TO BOTTOM-SIDE GROUND PLANE
OUT
CC
Figure 3. Layout Guidelines for MAX15062A and MAX15062B
MaximꢀIntegratedꢀꢀ
│ 19
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MAX15062
60V, 300mA, Ultra-Small, High-Efficiency,
Synchronous Step-Down DC-DC Converters
L1
V
IN
V
V
OUT
LX
IN
C
IN
C
OUT
R1
R2
GND
EN/UVLO
R4
R5
MAX15062C
FB
V
CC
V
CC
RESET
C
VCC
R3
MODE
V
CC
V
PLANE
IN
C
IN
U1
L1
LX
R1
V
IN
EN/UVLO
GND
RESET
C
OUT
V
CC
R2
FB
C
VCC
MODE
V
OUT
PLANE
R5
R4
GND
PLANE
R3
VIAS TO V
VIAS TO V
VIAS TO BOTTOM-SIDE GROUND PLANE
OUT
CC
Figure 4. Layout Guidelines for MAX15062C
MaximꢀIntegratedꢀꢀ
│ 20
www.maximintegrated.com
MAX15062
60V, 300mA, Ultra-Small, High-Efficiency,
Synchronous Step-Down DC-DC Converters
L1
33µH
L1
47µH
V
V
V
V
IN
6V TO
60V
OUT
OUT
IN
3.3V,
5V,
4.5V TO
V
LX
V
LX
IN
IN
C
IN
1µF
C
IN
1µF
300mA
300mA
C
C
OUT
10µF
60V
OUT
10µF
EN/UVLO
GND
EN/UVLO
GND
MAX15062A
MAX15062B
V
CC
V
CC
RESET
RESET
C
VCC
1µF
C
VCC
1µF
V
V
MODE
MODE
OUT
OUT
MODE = GND FOR PWM
MODE = OPEN FOR PFM
MODE = GND FOR PWM
MODE = OPEN FOR PFM
L1: COILCRAFT LPS4018-333ML
L1: COILCRAFT LPS4018-473ML
C
: MURATA 10µF/X7R/6.3V/1206 GRM31CR70J106K
OUT
C
: MURATA 10µF/X7R/6.3V/1206 GRM31CR70J106K
OUT
C : MURATA 1µF/X7R/100V/1206 GRM31CR72A105K
IN
C : MURATA 1µF/X7R/100V/1206 GRM31CR72A105K
IN
Figure 6. 5V, 300mA Step-Down Regulator
Figure 5. 3.3V, 300mA Step-Down Regulator
L1
100µH
L1
22µH
V
V
OUT
IN
V
V
OUT
IN
12V,
14V TO
60V
V
LX
2.5V,
IN
4.5V TO
60V
V
LX
IN
C
IN
1µF
300mA
C
C
IN
1µF
OUT
300mA
C
OUT
4.7µF
22µF
EN/UVLO
GND
EN/UVLO
GND
R1
R1
MAX15062C
MAX15062C
499kΩ
133kΩ
V
CC
FB
V
CC
FB
C
VCC
1µF
C
VCC
1µF
R2
R2
MODE
RESET
MODE
RESET
40.2kΩ
75kΩ
MODE = GND FOR PWM
MODE = OPEN FOR PFM
MODE = GND FOR PWM
MODE = OPEN FOR PFM
L1: Wurth 74408943101
L1: COILCRAFT LPS4018-223ML
C
C
: MURATA 4.7µF/X7R/16V/1206 (GRM31CR71C475K)
C
: MURATA 22µF/X7R/6.3V/1206 (GRM31CR70J226K)
OUT
OUT
: MURATA 1µF/X7R/100V/1206 (GRM31CR72A105K)
C : MURATA 1µF/X7R/100V/1206 (GRM31CR72A105K)
IN
IN
Figure 8. 12V, 300mA Step-Down Regulator
Figure 7. 2.5V, 300mA Step-Down Regulator
MaximꢀIntegratedꢀꢀ
│ 21
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MAX15062
60V, 300mA, Ultra-Small, High-Efficiency,
Synchronous Step-Down DC-DC Converters
Ordering Information
L1
22µH
PIN-
PACKAGE
V
V
OUT
IN
PART
TEMP RANGE
V
OUT
1.8V,
4.5V TO
V
LX
IN
C
IN
300mA
C
60V
OUT
1µF
MAX15062AATA+
MAX15062BATA+
MAX15062CATA+
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
8 TDFN
3.3V
5V
22µF
EN/UVLO
GND
8 TDFN
R1
MAX15062C
75kΩ
8 TDFN
Adj
V
CC
FB
+Denotes a lead(Pb)-free/RoHS-compliant package.
C
VCC
1µF
R2
MODE
RESET
75kΩ
Chip Information
PROCESS:ꢀBiCMOS
MODE = GND FOR PWM
MODE = OPEN FOR PFM
L1: COILCRAFT LPS4018-223ML
C
C
: MURATA 22µF/X7R/6.3V/1206 (GRM31CR70J226K)
OUT
IN
Package Information
: MURATA 1µF/X7R/100V/1206 (GRM31CR72A105K)
For the latest package outline information and land patterns
(footprints), go to www.maximintegrated.com/packages. Note
thatꢀaꢀ“+”,ꢀ“#”,ꢀorꢀ“-”ꢀinꢀtheꢀpackageꢀcodeꢀindicatesꢀRoHSꢀstatusꢀ
only. Package drawings may show a different suffix character, but
theꢀdrawingꢀpertainsꢀtoꢀtheꢀpackageꢀregardlessꢀofꢀRoHSꢀstatus.
Figure 9. 1.8V, 300mA Step-Down Regulator
L1
150µH
V
V
OUT
IN
PACKAGE
TYPE
PACKAGE
CODE
OUTLINE
NO.
LAND
PATTERN NO.
15V,
17V TO
60V
V
IN
LX
C
IN
300mA
C
OUT
1µF
4.7µF
EN/UVLO
GND
8 TDFN
T822CN+1
21-0487
90-0349
R1
MAX15062C
499kΩ
V
CC
FB
C
VCC
1µF
R2
MODE
RESET
31.6kΩ
MODE = GND FOR PWM
MODE = OPEN FOR PFM
L1: TDK VLC6045T-151M
C
C
: MURATA 4.7µF/X7R/25V/1206 (GRM31CR71E475K)
OUT
IN
: MURATA 1µF/X7R/100V/1206 (GRM31CR72A105K)
Figure 10. 15V, 300mA Step-Down Regulator
MaximꢀIntegratedꢀꢀ
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MAX15062
60V, 300mA, Ultra-Small, High-Efficiency,
Synchronous Step-Down DC-DC Converters
Revision History
REVISION REVISION
PAGES
CHANGED
DESCRIPTION
NUMBER
DATE
0
1
6/13
Initialꢀrelease
AddedꢀMAX15062C,ꢀaddedꢀfigures,ꢀupdatedꢀtablesꢀandꢀfiguresꢀthroughout
—
10/13
1–17
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim Integrated’s website at www.maximintegrated.com.
Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent licenses
are implied. Maxim Integrated reserves the right to change the circuitry and specifications without notice at any time. The parametric values (min and max limits)
shown in the Electrical Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance.
©
Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc.
2013 MaximꢀIntegratedꢀProducts,ꢀInc.ꢀꢀ
│ 23
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