MAX15062CATA+T [MAXIM]
Switching Regulator, Current-mode, 0.62A, 535kHz Switching Freq-Max, BICMOS, PDSO8, 2 X 2 MM, ROHS COMPLIANT, TDFN-8;
| 型号： | MAX15062CATA+T |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | Switching Regulator, Current-mode, 0.62A, 535kHz Switching Freq-Max, BICMOS, PDSO8, 2 X 2 MM, ROHS COMPLIANT, TDFN-8 信息通信管理 开关 光电二极管 |
| 文件： | 总23页 (文件大小：3161K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
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 Option
IN
• 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
•ꢀ HighꢀIndustrialꢀ-40°Cꢀtoꢀ+125°CꢀAmbientꢀOperatingꢀ
ꢀ
ꢀ
TemperatureꢀRange/-40°Cꢀtoꢀ+150°CꢀJunctionꢀ
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
MAX15062A
V
CC
RESET
C
VCC
1µF
V
MODE
OUT
19-6685; Rev 2; 7/16
MAX15062
60V, 300mA, Ultra-Small, High-Efficiency,
Synchronous Step-Down DC-DC Converters
Absolute Maximum Ratings
V
ꢀtoꢀGND..............................................................-0.3Vꢀtoꢀ70V
Continuous Power Dissipation (T ꢀ=ꢀ+70°C)
IN
A
EN/UVLOꢀtoꢀGND....................................................-0.3Vꢀtoꢀ70V
LXꢀtoꢀGND....................................................-0.3V to V + 0.3V
8-PinꢀTDFNꢀ(derateꢀ6.2mW/NCꢀaboveꢀ+70°C) ...........496mW
JunctionꢀTemperature......................................................+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. Junction temperature greater than +125°C degrades operating lifetimes.
(Note 1)
Package Thermal Characteristics
TDFN
Junction-to-AmbientꢀThermalꢀResistanceꢀ(θ ) ......+162°C/W
JA
Junction-to-CaseꢀThermalꢀResistanceꢀ(θ ).............+20°C/W
JC
Note 1:ꢀ PackageꢀthermalꢀresistancesꢀwereꢀobtainedꢀusingꢀtheꢀmethodꢀdescribedꢀinꢀJEDECꢀspecificationꢀJESD51-7,ꢀusingꢀaꢀfour-layerꢀ
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 = -40°C to +125°C, unless
IN
GND
IN
VCC
EN/UVLO A
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
5
5.25
50
V
mA
V
CC
CC
CC
CC
IN
I
V
V
V
V
= 4.3V, V = 12V
13
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
4.3
CC-UVR
V
UVLO
V
CC
V
3.7
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 = -40°C to +125°C, unless
IN
GND
IN
VCC
EN/UVLO
A
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
3.8
4.1
4.4
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 = -40°C to +125°C, unless
IN
GND
IN
VCC
EN/UVLO
A
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
%
%
OUT
FB/V
OUT
falling
94
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
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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.)
EN/UVLO A
IN
GND
IN
VCC
BODE PLOT
SOFT-START WITH 3V PREBIAS
OVERLOAD PROTECTION
MAX15062 toc34
MAX15062 toc3
MAX15062 toc33
50
180
144
108
72
40
30
20
10
0
V
V
IN
20V/div
EN/UVLO
5V/div
GAIN
PHASE
V
OUT
V
OUT
2V/div
1V/div
36
FIGURE 6
APPLICATION CIRCUIT
NO LOAD
0
f
= 47kHz,
PHASE MARGIN = 59°
CR
-10
-36
-72
-108
-144
-180
-20
-30
-40
-50
PWM MODE
FIGURE 5 APPLICATION CIRCUIT
I
OUT
200mA/div
V
= 3.3V
OUT
V
RESET
5V/div
2
4
6 8 1
10k
FREQUENCY (Hz)
2
4
6 8 1
2
1k
100k
1ms/div
20ms/div
BODE PLOT
BODE PLOT
BODE PLOT
MAX15062 toc35
MAX15062 toc35b
MAX15062 toc35a
50
40
180
144
108
72
50
40
180
144
108
72
50
180
144
108
72
40
30
GAIN
GAIN
GAIN
30
30
PHASE
20
20
20
PHASE
PHASE
10
36
10
36
10
36
0
0
0
0
0
0
f
= 43kHz,
CR
f
= 36kHz,
CR
f
= 47kHz,
CR
PHASE MARGIN = 60°
-10
-20
-30
-40
-50
-36
-72
-108
-144
-180
-10
-20
-30
-40
-50
-36
-72
-108
-144
-180
-10
-20
-30
-40
-50
-36
-72
-108
-144
-180
PHASE MARGIN = 66°
PHASE MARGIN = 60°
FIGURE 7 APPLICATION CIRCUIT
= 2.5V
FIGURE 6 APPLICATION CIRCUIT
= 5V
FIGURE 8 APPLICATION CIRCUIT
V
OUT
V
OUT
V
= 12V
OUT
2
4
6 8 1
10k
FREQUENCY (Hz)
2
4
6 8 1
2
1k
10k
100k
1k
10k
100k
1k
100k
FREQUENCY (Hz)
FREQUENCY (Hz)
MAX15062, 5V OUTPUT, 0.3A LOAD CURRENT,
CONDUCTED EMI CURVE
70
QUASI-PEAK LIMIT
AVERAGE LIMIT
60
50
40
30
20
10
PEAK
EMISSIONS
AVERAGE
EMISSIONS
30
1
10
0.15
FREQUENCY (MHz)
MeasuredꢀonꢀtheꢀMAX15062BEVKITꢀwithꢀInputꢀFilter–
ꢀ=ꢀ4.7µF,ꢀꢀL ꢀ=ꢀ10µH
C
IN
IN
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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
GND
InductorꢀConnection.ꢀConnectꢀLXꢀtoꢀtheꢀswitchingꢀsideꢀofꢀtheꢀinductor.ꢀLXꢀisꢀhighꢀimpedanceꢀwhenꢀtheꢀ
device is in shutdown.
8
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 (0.89), 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-limit value. The required inductance for a given
application can be determined from the following equation:
Overcurrent Protection/Hiccup Mode
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.
MaximꢀIntegratedꢀꢀ
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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
CoilcraftꢀLPS4018-473ML
Coilcraft LPS4018-223ML
Wurthꢀ74408943101
4.5 to 60
14 to 60
17ꢀtoꢀ60
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
17ꢀtoꢀ60
15
withꢀ high-ripple-currentꢀ capabilityꢀ atꢀ theꢀ input.ꢀ X7Rꢀ capacitorsꢀ
are recommended in industrial applications for their
temperature stability. Calculate the input capacitance
using the following equation:
V
IN
V
IN
MAX15062
EN/UVLO
R1
R2
(1 - D)
C
= I
x D x
IN
OUT(MAX)
η x f
x ∆V
IN
SW
where D = V
/V is the duty ratio of the converter,
OUT IN
f
ꢀisꢀtheꢀswitchingꢀfrequency,ꢀΔV is the allowable input
SW
IN
voltageꢀripple,ꢀandꢀηꢀisꢀtheꢀefficiency.ꢀ
Inꢀapplicationsꢀwhereꢀtheꢀsourceꢀisꢀlocatedꢀdistantꢀfromꢀ
the device input, an electrolytic capacitor should be
added in parallel to the ceramic capacitor to provide
necessary damping for potential oscillations caused by the
inductance of the longer input power path and input
ceramic capacitor.
Figure 1. Adjustable EN/UVLO Network
Input Capacitor
The input filter capacitor reduces peak currents drawn
from the power source and reduces noise and voltage
ripple on the input caused by the circuit’s switching.
Theꢀ inputꢀ capacitorꢀ RMSꢀ currentꢀ requirementꢀ (I
defined by the following equation:
) is
Output Capacitor
RMS
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
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%.ꢀRequiredꢀoutputꢀcapacitanceꢀcanꢀbeꢀcalculatedꢀfromꢀ
the following equation:
√(V
x (VIN - V
V
)
OUT
OUT
I
= I
x
RMS
OUT(MAX)
IN
ꢀisꢀtheꢀmaximumꢀloadꢀcurrent.ꢀI
a maximum value when the input voltage equals twice
where,ꢀI
has
OUT(MAX)
RMS
the output voltage (V = 2 x V ),ꢀ soꢀ I
=
RMS(MAX)
IN
OUT
I
/2.
OUT(MAX)
Choose an input capacitor that exhibits less than +10°C
temperatureꢀ riseꢀ atꢀ theꢀ RMSꢀ inputꢀ currentꢀ forꢀ optimalꢀ
long-termꢀ reliability.ꢀ Useꢀ low-ESRꢀ ceramicꢀ capacitorsꢀ
MaximꢀIntegratedꢀꢀ
│ 17
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MAX15062
60V, 300mA, Ultra-Small, High-Efficiency,
Synchronous Step-Down DC-DC Converters
where P
powerꢀconversion,ꢀandꢀR
ꢀ isꢀ theꢀ outputꢀ power,ꢀ ηꢀ isꢀ theꢀ efficiencyꢀ ofꢀ
OUT
30
is the DC resistance of the
C
=
DCR
OUT
V
OUT
output inductor. See the Typical Operating Characteristics
for the power-conversion efficiency or measure the effi-
ciency to determine the total power dissipation.
where C
is the output capacitance in µF and V
OUT
OUT
is the output voltage. Derating of ceramic capacitors with
DC-voltage must be considered while selecting the output
capacitor. Derating curves are available from all major
ceramic capacitor vendors. See Table 2 to select the out-
put capacitor for typical applications.
Setting the Input Undervoltage-Lockout Level
The devices offer an adjustable input undervoltage-
lockout level. Set the voltage at which the device turns
The junction temperature (T ) of the device can be esti-
J
mated at any ambient temperature (T ) from the following
A
equation:
T = T + θ ×P
LOSS
(
)
J
A
JA
whereꢀθ is the junction-to-ambient thermal impedance
JA
of the package.
Junctionꢀ temperatureꢀ greaterꢀ thanꢀ +125°Cꢀ degradesꢀ
operating lifetimes.
on with a resistive voltage-divider connected from V
toꢀGNDꢀ(seeꢀFigure 1). Connect the center node of the
IN
divider to EN/UVLO.
ChooseꢀR1ꢀtoꢀbeꢀ3.3MΩꢀmax,ꢀandꢀthenꢀcalculateꢀR2ꢀasꢀ
follows:
PCB Layout Guidelines
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.
R1×1.215
R2 =
(V
-1.215)
INU
●ꢀ Placeꢀtheꢀinputꢀceramicꢀcapacitorꢀasꢀcloseꢀasꢀpossibleꢀ
to the V ꢀandꢀGNDꢀpins.
IN
where V
is the voltage at which the device is required
INU
to turn on.
●ꢀ Connectꢀ theꢀ negativeꢀ terminalꢀ ofꢀ theꢀ V
bypass
CC
capacitorꢀtoꢀtheꢀGNDꢀpinꢀwithꢀshortestꢀpossibleꢀtraceꢀorꢀ
ground plane.
IfꢀtheꢀEN/UVLOꢀpinꢀisꢀdrivenꢀfromꢀanꢀexternalꢀsignalꢀsource,ꢀ
aꢀseriesꢀresistanceꢀofꢀminimumꢀ1kΩꢀisꢀrecommendedꢀtoꢀbeꢀ
placed between the signal source output and the EN/UVLO
pin, to reduce voltage ringing on the line.
●ꢀ MinimizeꢀtheꢀareaꢀformedꢀbyꢀtheꢀLXꢀpinꢀandꢀtheꢀinduc-
torꢀconnectionꢀtoꢀreduceꢀtheꢀradiatedꢀEMI.
Adjusting the Output Voltage
The MAX15062C output voltage can be programmed
●ꢀ PlaceꢀtheꢀV
decoupling capacitor as close as pos-
CC
sible to the V
pin.
CC
from 0.9V to 0.89 x V . Set the output voltage by con-
IN
●ꢀ Ensureꢀ thatꢀ allꢀ feedbackꢀ connectionsꢀ areꢀ shortꢀ andꢀ
nectingꢀaꢀresistor-dividerꢀfromꢀoutputꢀtoꢀFBꢀtoꢀGNDꢀ(seeꢀ
Figure 2).
direct.
●ꢀ Routeꢀtheꢀhigh-speedꢀswitchingꢀnodeꢀ(LX)ꢀawayꢀfromꢀ
Forꢀtheꢀoutputꢀvoltagesꢀlessꢀthanꢀ6V,ꢀchooseꢀR2ꢀinꢀtheꢀ
50kΩꢀ toꢀ 150kΩꢀ range.ꢀ Forꢀ theꢀ outputꢀ voltagesꢀ greaterꢀ
thanꢀ6V,ꢀchooseꢀR2ꢀinꢀtheꢀ25kΩꢀtoꢀ75kΩꢀrangeꢀandꢀcalcu-
lateꢀR1ꢀwithꢀtheꢀfollowingꢀequation:
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.
V
OUT
R1 = R2 ×
− 1
0.9
V
OUT
Power Dissipation
R1
R2
At a particular operating condition, the power losses that
lead to temperature rise of the part are estimated as fol-
lows:
FB
MAX15062C
1
2
GND
P
= P
×
- 1 - (I
×R
)
DCR
LOSS
OUT
OUT
η
P
= V
×I
OUT OUT
OUT
Figure 2. Setting the Output Voltage
MaximꢀIntegratedꢀꢀ
│ 18
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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
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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
│ 22
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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
2
6/13
Initialꢀrelease
—
10/13
7/16
AddedꢀMAX15062C,ꢀaddedꢀfigures,ꢀupdatedꢀtablesꢀandꢀfiguresꢀthroughout
OperatingꢀandꢀJunctionꢀtemperatureꢀvalueꢀupdate,ꢀadditionalꢀTOCꢀandꢀtext.
1–17
1–4,ꢀ12,ꢀ16–18
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.
2016 MaximꢀIntegratedꢀProducts,ꢀInc.ꢀꢀ
│ 23
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