MAX17671 [MAXIM]
Integrated 4V-60V, 150mA, High-Efficiency Synchronous Step-Down DC-DC Converter with 50mA Linear Regulator;
| 型号： | MAX17671 |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | Integrated 4V-60V, 150mA, High-Efficiency Synchronous Step-Down DC-DC Converter with 50mA Linear Regulator |
| 文件： | 总25页 (文件大小：1122K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
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MAX17670, MAX17671,
MAX17672
Integrated 4V-60V, 150mA, High-Efficiency,
Synchronous Step-Down DC-DC Converter
with 50mA Linear Regulator
General Description
Benefits and Features
The Himalaya series of voltage regulator ICs, power
modules, and chargers enable cooler, smaller, and sim-
pler power-supply solutions. MAX17670, MAX17671, and
MAX17672 are dual-output regulators integrating a 4V
to 60V, 150mA high-voltage, high-efficiency, Himalaya
synchronous step-down converter with internal MOSFETs
and a high-PSRR, low-noise, 2.35V to 5.5V, 50mA linear
regulator. The MAX17670 and MAX17671 provide fixed
step-down converter output voltages of 3.3V and 5V,
respectively. The output voltage of the MAX17672 step-
● Reduces External Components and Total Cost
• No Schottky–Synchronous Operation
• Internal Compensation
• Built-In Soft-Start
• All-Ceramic Capacitors, Compact Layout
•
Protection against Inductive Short at Step-Down
Converter Output
● Reduces Number of DC-DC Regulators to Stock
• Wide 4V to 60V Input Range for the Step-Down
Converter Regulator
• Up to 98% Duty-Cycle Step-Down Operation
• 200kHz to 2.2MHz Adjustable Switching Frequency
with External Synchronization for Step-down
Converter
• 2.35V to 5.5V, Input Range for the Linear Regulator
• Linear Regulator with up to 50mA Load Current
Capability
down converter is adjustable (0.8V up to 90% of V ).
IN
3.3V (MAX17671 and MAX17672 only), 3.0V, 2.5V, 1.8V,
1.5V, and 1.2V linear regulator output voltage options are
supported. See the Ordering Information for details.
The feedback-voltage regulation accuracy over -40°C
to +125°C temperature range for the linear regulator
is ±1.3% and for the step-down converter is ±2%. The
devices are available in a compact 10-pin (3mm x 3mm)
TDFN package. Simulation models are available.
●
Reduces Power Dissipation
• 50μA No-Load Supply Current
Applications
● Industrial Sensors and Process Control
● High-Voltage Linear Regulator Replacement
● Battery-Powered Equipment
• PFM Enables Enhanced Light-Load Efficiency
• 2.5μA Shutdown Current
• Bootstrap Bias Input for Improved Efficiency
● Reliable Operation in Adverse Environments
● HVAC and Building Control
• Peak Current-Limit Protection
• Built-In Output-Voltage Monitoring with RESET
• Resistor Programmable EN/UVLO Threshold
• Monotonic Startup into Prebiased Load
• Overtemperature Protection
Ordering Information appears at end of data sheet.
• High Industrial -40°C to +125°C Ambient Operating
Temperature Range / -40°C to +150°C Junction
Temperature Range
Simplified Application Circuit
L1
V
OUT
V
IN
IN
LX
C1
C3
R1
R2
GND
EN/UVLO
MAX17670/
MAX17671
FBBUCK
RESET
INL
OUTL
V
OUTL
C2
MODE/SYNC
RT
EP
19-100364; Rev 2; 4/20
MAX17670, MAX17671,
MAX17672
Integrated 4V-60V, 150mA, High-Efficiency,
Synchronous Step-Down DC-DC Converter
with 50mA Linear Regulator
Absolute Maximum Ratings
IN to GND..............................................................-0.3V to +70V
LX, EN/UVLO to GND....................................-0.3V to IN + 0.3V
RT, OUTL, MODE/SYNC, RESET to GND .............-0.3V to +6V
Linear Regulator and Step-Down Converter
Output Short-Circuit Duration................................Continuous
Continuous Power Dissipation
INL to GND.......................-5.5V to lower of (V + 0.6V) or +6V
(T = +70°C, derate 24.4mW/°C above +70°C.).......1952mW
IN
A
FBBUCK to GND (MAX17670, MAX17671)............-5.5V to +6V
FBBUCK to GND (MAX17672) ...............................-0.3V to +6V
INL to FBBUCK ..........................................................-5V to +6V
Operating Temperature Range (Note 1)........... -40°C to +125°C
Junction Temperature....................................... -40°C to +150°C
Storage Temperature Range............................ -65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
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: Junction temperature greater than +125°C degrades operating lifetimes.
Package Information
PACKAGE TYPE: 10-PIN TDFN
Package Code
T1033+1C
21-0137
90-0003
Outline Number
Land Pattern Number
THERMAL RESISTANCE, FOUR-LAYER BOARD:
Junction to Ambient (θ
)
41°C/W
9°C/W
JA
Junction to Case (θ
)
JC
For the latest package outline information and land patterns (footprints), go to www.maximintegrated.com/packages. Note that a “+”,
“#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing
pertains to the package regardless of RoHS status.
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.
Maxim Integrated
│ 2
www.maximintegrated.com
MAX17670, MAX17671,
MAX17672
Integrated 4V-60V, 150mA, High-Efficiency,
Synchronous Step-Down DC-DC Converter
with 50mA Linear Regulator
Electrical Characteristics
(V = V
= 24V, V = 5V, V
= 1.05 x V
, C
= 2.2μF to GND, V
= 0V, RT = LX = MODE/SYNC =
GND
IN
EN/UVLO
INL
FBBUCK
FBBUCK-REG OUTL
RESET = unconnected, T = -40°C to +125°C, unless otherwise noted. Typical values are at T = +25°C. All voltages are referenced
A
A
to GND, unless otherwise noted.) (Note 2)
PARAMETER
INPUT SUPPLY (IN)
SYMBOL
CONDITIONS
MIN
TYP
MAX UNITS
Input-Voltage Range
V
4
60
V
IN
Input-Shutdown Current
I
V
V
= 0V, T = +25°C
2.5
70
4.5
μA
IN-SH
EN/UVLO
FBBUCK
A
I
Q-PFM
= 0.95 x V
, Normal
, Normal
FBBUCK-REG
= 0V
1336
1000
switching mode, V
Input-Quiescent Current
μA
INL
I
Q-PWM
V
= 0.95 x V
FBBUCK-REG
FBBUCK
switching mode, V
= 5V
INL
ENABLE/UVLO (EN/UVLO)
V
V
V
V
rising
falling
1.19
1.068
-100
1.215
1.09
1.24
1.112
100
ENR
EN/UVLO
EN/UVLO
EN/UVLO
EN/UVLO Threshold
V
V
ENF
EN/UVLO Input-Leakage Current
EXTERNAL BIAS (INL)
I
= 1.3V, T = 25°C
nA
ENLKG
A
INL Switch Over Voltage
V
INL rising
2.725
3.21
3
3.21
5.5
V
V
V
INL_TH
INL Switch Over Hysteresis
INL Operating Voltage Range
V
0.17
INL_HYS
HIGH-SIDE MOSFET AND LOW-SIDE MOSFET DRIVER
High-Side pMOS
On-Resistance
R
I
I
= 0.1A (Sourcing)
2.7
5.1
2.7
+1
Ω
Ω
DS-ONH
LX
LX
Low-Side nMOS
On-Resistance
R
= 0.1A (Sinking)
= 0V, V = (V
1.33
DS-ONL
LX_LKG
V
+1V) to (V - 1V),
IN
EN
LX
GND
LX-Leakage Current
I
-1
μA
T = 25°C
A
SOFT-START
Soft-Start Time
t
4.4
5.1
5.8
ms
SS1
STEP-DOWN CONVERTER FEEDBACK (FBBUCK)
MODE/SYNC = GND, MAX17670
MODE/SYNC = unconnected, MAX17670
MODE/SYNC = GND, MAX17671
MODE/SYNC = unconnected, MAX17671
MODE/SYNC = GND, MAX17672
MODE/SYNC = unconnected, MAX17672
MAX17670, MAX17671
3.216
3.216
4.887
3.3
3.35
5
3.365
3.425
5.087
V
FBBUCK-
REG
FBBUCK Regulation Voltage
V
4.887 5.075 5.188
0.782 0.8 0.814
0.782 0.812 0.830
10
μA
FBBUCK Input-Bias Current
I
FBBUCK
MAX17672
-100
100
nA
Maxim Integrated
│ 3
www.maximintegrated.com
MAX17670, MAX17671,
MAX17672
Integrated 4V-60V, 150mA, High-Efficiency,
Synchronous Step-Down DC-DC Converter
with 50mA Linear Regulator
Electrical Characteristics (continued)
(V = V
= 24V, V = 5V, V
= 1.05 x V
, C
= 2.2μF to GND, V
= 0V, RT = LX = MODE/SYNC =
GND
IN
EN/UVLO
INL
FBBUCK
FBBUCK-REG OUTL
RESET = unconnected, T = -40°C to +125°C, unless otherwise noted. Typical values are at T = +25°C. All voltages are referenced
A
A
to GND, unless otherwise noted.) (Note 2)
PARAMETER
CURRENT LIMIT
SYMBOL
CONDITIONS
MIN
TYP
MAX UNITS
Peak Current-Limit Threshold
I
245
65
295
105
1
345
145
mA
mA
mA
PEAK-LIMIT
MODE/SYNC = GND
Sink Current-Limit Threshold
I
SINK-LIMIT
PFM Current-Limit Threshold
OSCILLATOR (RT)
I
55
92
120
PFM
Switching Frequency Accuracy
Switching Frequency
f
= 200kHz to 2.2MHz
-11
+11
680
%
SW
f
536
610
SW
kHz
Switching Frequency
Adjustable Range
See the Switching Frequency (RT)
section for details
200
2200
TIMING
Minimum On-Time
Minimum Off-Time
t
75
55
128
75
ns
ns
ON_MIN
t
40
48
OFF_MIN
Minimum Off-Time during SYNC
Mode of Operation
t
OFF_
MIN(SYNC)
75
51
100
ns
HICCUP Timeout
ms
MODE/SYNC
Mode = PFM
Mode = PWM
32
MODE/SYNC Internal
Pullup Resistor
R
kΩ
MODE
1100
1.1 x
1.4 x
f
SW
SYNC Input Frequency
f
SW
Minimum SYNC Pulse Width
100
2.1
ns
V
V
IH
SYNC Threshold
V
0.8
IL
RESET
RESET Output-Level Low
400
100
mV
nA
I
= 10mA
RESET
-100
92
T
= +25°C, V
= 5.5V
RESET Output-Leakage Current
A
RESET
FBBUCK Threshold for RESET
Rising
V
FBBUCK rising (Note 3)
FBBUCK falling (Note 3)
OUTL rising (Note 3)
OUTL falling (Note 3)
95
92
98
95
FBBUCKR
FBBUCK Threshold for RESET
Falling
V
89
91.5
88
FBBUCKF
%
OUTL Threshold for RESET
Rising
V
94.5
91
97.5
94
OUTLR
OUTL Threshold for RESET
Falling
V
OUTLF
Maxim Integrated
│ 4
www.maximintegrated.com
MAX17670, MAX17671,
MAX17672
Integrated 4V-60V, 150mA, High-Efficiency,
Synchronous Step-Down DC-DC Converter
with 50mA Linear Regulator
Electrical Characteristics (continued)
(V = V
= 24V, V = 5V, V
= 1.05 x V
, C
= 2.2μF to GND, V
= 0V, RT = LX = MODE/SYNC =
GND
IN
EN/UVLO
INL
FBBUCK
FBBUCK-REG OUTL
RESET = unconnected, T = -40°C to +125°C, unless otherwise noted. Typical values are at T = +25°C. All voltages are referenced
A
A
to GND, unless otherwise noted.) (Note 2)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX UNITS
RESET Delay after FBBUCK
See Reset Output (RESET) section
for details
t
2.1
ms
and V
Reach 95%
D
OUTL
Regulation
LINEAR REGULATOR INPUT SUPPLY (INL)
Linear Regulator Input-Voltage
Range
V
2.35
2.11
5.5
V
INL
I
V
= 0A, V
= 5, V
= 0.95 ×
OUTL
INL
FFBUCK
710
, Normal Switching mode.
Linear Regulator Input-Quiescent
Current
FFBUCK-REG
I
μA
INL
I
= 0A, V
= 2.5
35
2.18
50
OUTL
INL
Linear Regulator UVLO
V
2.25
V
INL_UVLO
Linear Regulator UVLO
Hysteresis
V
INL_
UVLO(HYS)
mV
LINEAR REGULATOR OUTPUT VOLTAGE (OUTL)
V
V
= 2.8V, I
= 10mA,
INL
OUTL
-1.5
+1.5
= 1.2V, 1.5V, 1.8V
OUTL
OUTL Accuracy
Load Regulation
%
%
V
V
= V
+ 0.8V, I
= 10mA,
INL
OUTL
OUTL
-1.33
+1.33
= 2.5V, 3.0V, 3.3V
OUTL
0.1mA < I
V
< 50mA. V
= 2.8V for
OUTL
INL
= 1.2V, 1.5V, 1.8V; V
= V
OUTL
0.5
0.9
OUTL
INL
+0.8V for V
= 2.5V, 3.0V, 3.3V
OUTL
Dropout Voltage
V
V
= V , I = 50mA (Note 4)
OUTL OUTL
200
84
400
mV
mA
ms
DO
INL
V
V
= 70% of nominal value,
OUTL
Linear Regulator Current Limit
I
55
LDO_LIM
= V
+ 2V
INL
OUTL
Soft-Start Time
t
1.1
SS2
THERMAL SHUTDOWN
Thermal-Shutdown Threshold
Thermal-Shutdown Hysteresis
Temperature rising
160
20
°C
°C
Note 2: All the Electrical Specifications are 100% production tested at T = +25°C. Specifications over the operating temperature
A
range are guaranteed by design and characterization.
Note 3: Specifications are in respect to regulation voltage.
Note 4: Applicable for linear regulators with nominal output voltages of 2.5V, 3.0V, and 3.3V.
Maxim Integrated
│ 5
www.maximintegrated.com
MAX17670, MAX17671,
MAX17672
Integrated 4V-60V, 150mA, High-Efficiency,
Synchronous Step-Down DC-DC Converter
with 50mA Linear Regulator
Typical Operating Characteristics
(V = 24V, V
= 0V, T = -40°C to +125°C, unless otherwise noted. Typical values are at T = +25°C. All voltages are referenced
IN
GND
A
A
to GND, unless otherwise noted.)
MAX17671F, 5V OUTPUT
LOAD AND LINE REGULATION
FIGURE 4 CIRCUIT
MAX17671F, 5V OUTPUT
EFFICIENCY vs. LOAD CURRENT
FIGURE 4 CIRCUIT
MAX17671F, 5V OUTPUT
EFFICIENCY vs. LOAD CURRENT
toc03
5.04
FIGURE 4 CIRCUIT
toc02
100
90
80
70
60
50
40
30
20
10
0
toc01
100
90
80
5.03
5.02
5.01
5.00
VIN = 36V
VIN = 12V
VIN = 60V
VIN = 36V
VIN = 60V
70
VIN = 48V
VIN = 24V
VIN = 48V
VIN = 36V
VIN = 24V
VIN = 12V
VIN = 6.5V
60
VIN = 60V
VIN = 12V
VIN = 6.5V
50
40
30
20
10
0
VIN = 48V
VIN = 24V
VIN = 6.5V
0.00
0.05
0.10
0.15
0.001
0.010
LOAD CURRENT (A)
0.100
0.00
0.05
0.10
0.15
LOAD CURRENT (A)
LOAD CURRENT (A)
CONDITIONS: PWM MODE, fSW = 200kHz
CONDITIONS: PFM MODE, fSW = 200kHz
CONDITIONS: PWM MODE, fSW = 200kHz
MAX17671F, 5V OUTPUT
LOAD AND LINE REGULATION
FIGURE 4 CIRCUIT
MAX17670E, 3.3V OUTPUT
EFFICIENCY vs. LOAD CURRENT
FIGURE 5 CIRCUIT
toc06
MAX17670E, 3.3V OUTPUT
EFFICIENCY vs. LOAD CURRENT
FIGURE 5 CIRCUIT
toc04
5.15
5.10
5.05
5.00
4.95
toc05
100
90
80
70
60
50
40
30
20
10
0
100
90
80
70
60
50
40
30
20
10
0
V
IN = 6.5V
VIN = 12V
VIN = 24V
VIN = 36V
VIN = 48V
IN = 60V
VIN = 36V
VIN = 60V
VIN = 48V
VIN = 60V
VIN = 24V
VIN = 12V
VIN = 4.5V
VIN = 48V
VIN = 36V
VIN = 24V
VIN = 12V
VIN = 4.5V
V
0.00
0.05
0.10
0.15
0.001
0.010
LOAD CURRENT (A)
CONDITIONS: PFM MODE, fSW = 200kHz
0.100
0.00
0.05
LOAD CURRENT (A)
CONDITIONS: PFM MODE, fSW = 200kHz
0.10
0.15
LOAD CURRENT (A)
CONDITIONS: PWM MODE, fSW = 200kHz
MAX17670E, 3.3V OUTPUT
LOAD AND LINE REGULATION
FIGURE 5 CIRCUIT
MAX17670E, 3.3V OUTPUT
LOAD AND LINE REGULATION
FIGURE 5 CIRCUIT
toc08
toc07
3.33
3.32
3.31
3.30
3.29
3.28
3.45
3.40
3.35
3.30
3.25
V
IN = 4.5V
VIN = 12V
VIN = 24V
VIN = 36V
VIN = 12V
VIN = 60V
VIN = 36V
VIN = 48V
VIN = 60V
VIN = 48V
VIN = 24V
VIN = 4.5V
0.00
0.05
LOAD CURRENT (A)
CONDITIONS: PWM MODE, fSW = 200kHz
0.10
0.15
0.00
0.05
LOAD CURRENT (A)
CONDITIONS: PFM MODE, fSW = 200kHz
0.10
0.15
Maxim Integrated
│ 6
www.maximintegrated.com
MAX17670, MAX17671,
MAX17672
Integrated 4V-60V, 150mA, High-Efficiency,
Synchronous Step-Down DC-DC Converter
with 50mA Linear Regulator
Typical Operating Characteristics (continued)
(V = 24V, V
= 0V, T = -40°C to +125°C, unless otherwise noted. Typical values are at T = +25°C. All voltages are referenced
IN
GND
A
A
to GND, unless otherwise noted.)
MAX17671F, 5V OUTPUT
EFFICIENCY vs. LOAD CURRENT
FIGURE 6 CIRCUIT
MAX17671F, 5V OUTPUT
EFFICIENCY vs. LOAD CURRENT
FIGURE 6 CIRCUIT
MAX17671F, 5V OUTPUT
LOAD AND LINE REGULATION
FIGURE 6 CIRCUIT
toc10
toc11
toc09
5.05
100
100
90
80
70
60
50
40
30
20
10
0
90
80
70
5.04
5.03
5.02
5.01
VIN = 12V
VIN = 60V
VIN = 36V
VIN = 36V
60
VIN = 48V
VIN = 48V
VIN = 60V
V
IN = 24V
VIN = 12V
VIN = 6.5V
50
40
30
20
10
0
VIN = 60V
VIN = 36V
VIN = 24V
VIN = 12V
VIN = 6.5V
VIN = 48V
VIN = 24V
VIN = 6.5V
0.00
0.05
0.10
0.15
0.00
0.05
0.10
0.15
0.001
0.010
LOAD CURRENT (A)
0.100
LOAD CURRENT (A)
LOAD CURRENT (A)
CONDITIONS: PWM MODE, fSW = 600kHz
CONDITIONS: PWM MODE, fSW = 600kHz
CONDITIONS: PFM MODE, fSW = 600kHz
MAX17670E, 3.3V OUTPUT
EFFICIENCY vs. LOAD CURRENT
FIGURE 7 CIRCUIT
MAX17670E, 3.3V OUTPUT
EFFICIENCY vs. LOAD CURRENT
FIGURE 7 CIRCUIT
MAX17671F, 5V OUTPUT
LOAD AND LINE REGULATION
FIGURE 6 CIRCUIT
toc12
toc13
toc14
5.15
5.10
5.05
5.00
4.95
100
90
80
70
60
50
40
30
20
10
0
100
90
80
70
60
50
40
30
20
10
0
VIN = 6.5V
VIN = 12V
VIN = 24V
VIN = 36V
VIN = 36V
VIN = 42V
VIN = 48V
VIN = 60V
VIN = 42V
VIN = 36V
VIN = 24V
VIN = 12V
VIN = 4.5V
VIN = 24V
VIN = 12V
VIN = 4.5V
0.00
0.05
0.10
0.15
0.00
0.05
LOAD CURRENT (A)
CONDITIONS: PWM MODE, fSW = 600kHz
0.10
0.15
0.001
0.010
0.100
LOAD CURRENT (A)
CONDITIONS: PFM MODE, fSW = 600kHz
LOAD CURRENT (A)
CONDITIONS: PFM MODE, fSW = 600kHz
MAX17670E, 3.3V OUTPUT
LOAD AND LINE REGULATION
FIGURE 7 CIRCUIT
MAX17670E, 3.3V OUTPUT
LOAD AND LINE REGULATION
FIGURE 7 CIRCUIT
toc15
toc16
3.31
3.30
3.29
3.28
3.27
3.26
3.45
3.40
3.35
3.30
3.25
VIN = 36V
VIN = 12V
VIN = 4.5V
VIN = 12V
VIN = 24V
VIN = 36V
VIN = 42V
VIN = 42V
VIN = 24V
VIN = 4.5V
0.00
0.05
LOAD CURRENT (A)
CONDITIONS: PWM MODE, fSW = 600kHz
0.10
0.15
0.00
0.05
0.10
0.15
LOAD CURRENT (A)
CONDITIONS: PFM MODE, fSW = 600kHz
Maxim Integrated
│ 7
www.maximintegrated.com
MAX17670, MAX17671,
MAX17672
Integrated 4V-60V, 150mA, High-Efficiency,
Synchronous Step-Down DC-DC Converter
with 50mA Linear Regulator
Typical Operating Characteristics (continued)
(V = 24V, V
= 0V, T = -40°C to +125°C, unless otherwise noted. Typical values are at T = +25°C. All voltages are referenced
IN
GND
A
A
to GND, unless otherwise noted.)
MAX17672C, 5V OUTPUT
LOAD AND LINE REGULATION
FIGURE 8 CIRCUIT
MAX17672C, 5V OUTPUT
EFFICIENCY vs. LOAD CURRENT
FIGURE 8 CIRCUIT
MAX17672C, 5V OUTPUT
EFFICIENCY vs. LOAD CURRENT
FIGURE 8 CIRCUIT
toc17
toc19
toc18
5.04
100
100
90
80
70
60
50
40
30
20
10
0
90
80
70
5.03
5.02
5.01
5.00
4.99
VIN = 12V
VIN = 60V
VIN = 36V
VIN = 36V
60
VIN = 48V
VIN = 48V
VIN = 60V
V
IN = 24V
VIN = 60V
50
40
30
20
10
0
VIN = 36V
VIN = 24V
VIN = 12V
VIN = 6.5V
VIN = 12V
VIN = 6.5V
VIN = 48V
VIN = 24V
VIN = 6.5V
0.001
0.010
LOAD CURRENT (A)
CONDITIONS: PFM MODE, fSW = 600kHz
0.100
0.00
0.05
0.10
0.15
0.00
0.05
0.10
0.15
LOAD CURRENT (A)
LOAD CURRENT (A)
CONDITIONS: PWM MODE, fSW = 600kHz
CONDITIONS: PWM MODE, fSW = 600kHz
MAX17672C, 5V OUTPUT
LOAD AND LINE REGULATION
FIGURE 8 CIRCUIT
MAX17671F, 5V OUTPUT
NO-LOAD SUPPLY CURRENT vs.
INPUT VOLTAGE, FIGURE 6 CIRCUIT
MAX17671F, 5V OUTPUT
SHUTDOWN CURRENT vs.
INPUT VOLTAGE, FIGURE 6 CIRCUIT
toc20
toc21
toc22
5.15
5.10
5.05
5.00
4.95
250
200
150
100
50
8
6
4
2
0
VIN = 6.5V
VIN = 12V
VIN = 24V
VIN = 36V
VIN = 48V
VIN = 60V
0
0.00
0.05
0.10
0.15
0
10
20
INPUT VOLTAGE (V)
CONDITIONS: PFM MODE, fSW = 600kHz
30
40
50
60
0
10
20
INPUT VOLTAGE (V)
CONDITIONS: PFM MODE, fSW = 600kHz
30
40
50
60
LOAD CURRENT (A)
CONDITIONS: PFM MODE, fSW = 600kHz
MAX17671F, 5V OUTPUT
LOAD TRANSIENT BETWEEN 0mA AND 50mA
MAX17671F, 5V OUTPUT
LOAD TRANSIENT BETWEEN 100mA AND 150mA
FIGURE 4 CIRCUIT
FIGURE 4 CIRCUIT
toc23
toc24
VOUT(AC)
VOUT(AC)
100mV/div
100mV/div
IOUT
IOUT
50mA/div
50mA/div
100µs/div
100µs/div
CONDITIONS: PWM MODE, fSW = 200kHz
CONDITIONS: PWM MODE, fSW = 200kHz
Maxim Integrated
│ 8
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MAX17670, MAX17671,
MAX17672
Integrated 4V-60V, 150mA, High-Efficiency,
Synchronous Step-Down DC-DC Converter
with 50mA Linear Regulator
Typical Operating Characteristics (continued)
(V = 24V, V
= 0V, T = -40°C to +125°C, unless otherwise noted. Typical values are at T = +25°C. All voltages are referenced
IN
GND
A
A
to GND, unless otherwise noted.)
MAX17671F, 5V OUTPUT
LOAD TRANSIENT BETWEEN 1mA AND 50mA
MAX17670E, 3.3V OUTPUT
LOAD TRANSIENT BETWEEN 0mA AND 50mA
MAX17670E, 3.3V OUTPUT
LOAD TRANSIENT BETWEEN 100mA AND 150mA
FIGURE 4 CIRCUIT
FIGURE 5 CIRCUIT
FIGURE 5 CIRCUIT
toc26
toc25
toc27
VOUT(AC)
100mV/div
VOUT(AC)
VOUT(AC)
100mV/div
100mV/div
IOUT
50mA/div
IOUT
IOUT
50mA/div
50mA/div
100µs/div
400µs/div
100µs/div
CONDITIONS: PWM MODE, fSW = 200kHz
CONDITIONS: PFM MODE, fSW = 200kHz
CONDITIONS: PWM MODE, fSW = 200kHz
MAX17671F, 5V OUTPUT
LOAD TRANSIENT BETWEEN 100mA AND 150mA
MAX17670E, 3.3V OUTPUT
LOAD TRANSIENT BETWEEN 1mA AND 50mA
MAX17671F, 5V OUTPUT
LOAD TRANSIENT BETWEEN 0mA AND 50mA
FIGURE 6 CIRCUIT
FIGURE 5 CIRCUIT
FIGURE 6 CIRCUIT
toc30
toc29
toc28
VOUT(AC)
100mV/div
VOUT(AC)
VOUT(AC)
100mV/div
100mV/div
IOUT
50mA/div
IOUT
50mA/div
IOUT
50mA/div
100µs/div
200µs/div
CONDITIONS: PWM MODE, fSW = 600kHz
100µs/div
CONDITIONS: PFM MODE, fSW = 200kHz
CONDITIONS: PWM MODE, fSW = 600kHz
MAX17670E, 3.3V OUTPUT
LOAD TRANSIENT BETWEEN 0mA AND 50mA
MAX17671F, 5V OUTPUT
LOAD TRANSIENT BETWEEN 1mA AND 50mA
FIGURE 7 CIRCUIT
FIGURE 6 CIRCUIT
toc32
toc31
VOUT(AC)
VOUT(AC)
100mV/div
100mV/div
IOUT
50mA/div
IOUT
50mA/div
100µs/div
100µs/div
CONDITIONS: PFM MODE, fSW = 600kHz
CONDITIONS: PWM MODE, fSW = 600kHz
Maxim Integrated
│ 9
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MAX17670, MAX17671,
MAX17672
Integrated 4V-60V, 150mA, High-Efficiency,
Synchronous Step-Down DC-DC Converter
with 50mA Linear Regulator
Typical Operating Characteristics (continued)
(V = 24V, V
= 0V, T = -40°C to +125°C, unless otherwise noted. Typical values are at T = +25°C. All voltages are referenced
IN
GND
A
A
to GND, unless otherwise noted.)
MAX17670E, 3.3V OUTPUT
LOAD TRANSIENT BETWEEN 100mA AND 150mA
MAX17670E, 3.3V OUTPUT
LOAD TRANSIENT BETWEEN 1mA AND 50mA
MAX17672C, 5V OUTPUT
LOAD TRANSIENT BETWEEN 0mA AND 50mA
FIGURE 7 CIRCUIT
FIGURE 7 CIRCUIT
FIGURE 8 CIRCUIT
toc35
toc33
toc34
VOUT(AC)
VOUT(AC)
100mV/div
100mV/div
VOUT(AC)
100mV/div
50mA/div
IOUT
IOUT
IOUT
50mA/div
50mA/div
100µs/div
100µs/div
100µs/div
CONDITIONS: PWM MODE, fSW = 600kHz
CONDITIONS: PWM MODE, fSW = 600kHz
CONDITIONS: PFM MODE, fSW = 600kHz
MAX17672C, 5V OUTPUT
LOAD TRANSIENT BETWEEN 100mA AND 150mA
MAX17672C, 5V OUTPUT
LOAD TRANSIENT BETWEEN 1mA AND 50mA
FIGURE 8 CIRCUIT
FIGURE 8 CIRCUIT
toc36
toc37
VOUT(AC)
100mV/div
VOUT(AC)
100mV/div
50mA/div
IOUT
IOUT
50mA/div
100µs/div
100µs/div
CONDITIONS: PWM MODE, fSW = 600kHz
CONDITIONS: PFM MODE, fSW = 600kHz
MAX17671F, 5V OUTPUT
STEADY STATE AT 0mA LOAD
FIGURE 6 CIRCUIT
MAX17671F, 5V OUTPUT
STEADY STATE AT 150mA LOAD
FIGURE 6 CIRCUIT
toc39
toc38
VOUT(AC)
VOUT(AC)
20mV/div
20mV/div
VLX
VLX
10V/div
10V/div
ILX
100mA/div
ILX
100mA/div
1µs/div
1µs/div
CONDITIONS: PWM MODE, fSW = 600kHz
CONDITIONS: PWM MODE, fSW = 600kHz
Maxim Integrated
│ 10
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MAX17670, MAX17671,
MAX17672
Integrated 4V-60V, 150mA, High-Efficiency,
Synchronous Step-Down DC-DC Converter
with 50mA Linear Regulator
Typical Operating Characteristics (continued)
(V = 24V, V
= 0V, T = -40°C to +125°C, unless otherwise noted. Typical values are at T = +25°C. All voltages are referenced
IN
GND
A
A
to GND, unless otherwise noted.)
MAX17671F, 5V OUTPUT
SOFT-START THROUGH EN/UVLO
FIGURE 6 CIRCUIT
MAX17671F, 5V OUTPUT
STEADY STATE AT 10mA LOAD
FIGURE 6 CIRCUIT
MAX17671F, 5V OUTPUT
SHUTDOWN THROUGH EN/UVLO
FIGURE 6 CIRCUIT
toc41
toc42
toc40
VOUT(AC)
100mV/div
VEN/UVLO
VEN/UVLO
5V/div
5V/div
VOUT
2V/div
VOUT
ILX
VLX
10V/div
2V/div
100mA/div
ILX
100mA/div
5V/div
ILX
VRESET
VRESET
5V/div
100mA/div
100µs/div
1ms/div
10µs/div
CONDITIONS: PWM MODE, fSW = 600kHz, 33Ω RESISTIVE LOAD,
RESET IS PULLED UP TO VOUT WITH A 10kΩ RESISTOR
CONDITIONS: PFM MODE, fSW = 600kHz
CONDITIONS: PWM MODE, fSW = 600kHz, 33Ω RESISTIVE LOAD,
RESET IS PULLED UP TO VOUT WITH A 10kΩ RESISTOR
MAX17670E, 3.3V OUTPUT
SOFT-START THROUGH EN/UVLO
MAX17671F, 5V OUTPUT
SOFT-START WITH PREBIAS VOLTAGE OF 2.5V
FIGURE 7 CIRCUIT
FIGURE 6 CIRCUIT
toc44
toc43
VEN/UVLO
VEN/UVLO
5V/div
5V/div
2V/div
VOUT
ILX
2V/div
VOUT
100mA/div
ILX
100mA/div
5V/div
VRESET
5V/div
VRESET
1ms/div
1ms/div
CONDITIONS: PWM MODE, fSW = 600kHz, 1kΩ RESISTIVE LOAD,
RESET IS PULLED UP TO VOUT WITH A 10kΩ RESISTOR
CONDITIONS: PWM MODE, fSW = 600kHz, 22Ω RESISTIVE LOAD,
RESET IS PULLED UP TO VOUT WITH A 10kΩ RESISTOR
MAX17671F, 5V OUTPUT
EXTERNAL CLOCK SYNCHRONIZATION
WITH 840kHz, FIGURE 6 CIRCUIT
toc46
MAX17672C, 5V OUTPUT
SOFT-START THROUGH EN/UVLO
FIGURE 8 CIRCUIT
toc45
VSYNC
VEN/UVLO
5V/div
5V/div
2V/div
VOUT
VOUT
50mV/div
20V/div
ILX
VLX
100mA/div
5V/div
VRESET
ILX
200mA/div
10µs/div
1ms/div
CONDITIONS: fSW = 600kHz, 150mA LOAD
CONDITIONS: PWM MODE, fSW = 600kHz, 33Ω RESISTIVE LOAD,
RESET IS PULLED UP TO VOUT WITH A 10kΩ RESISTOR
Maxim Integrated
│ 11
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MAX17670, MAX17671,
MAX17672
Integrated 4V-60V, 150mA, High-Efficiency,
Synchronous Step-Down DC-DC Converter
with 50mA Linear Regulator
Typical Operating Characteristics (continued)
(V = 24V, V
= 0V, T = -40°C to +125°C, unless otherwise noted. Typical values are at T = +25°C. All voltages are referenced
IN
GND
A
A
to GND, unless otherwise noted.)
MAX17671F, 5V OUTPUT
OVERLOAD PROTECTION
FIGURE 6 CIRCUIT
MAX17671F, 5V OUTPUT
CLOSED LOOP BODE PLOT
FIGURE 4 CIRCUIT
MAX17670E, 3.3V OUTPUT
CLOSED LOOP BODE PLOT
FIGURE 5 CIRCUIT
toc47
toc48
toc49
40
20
0
100
50
40
20
0
100
50
PHASE
PHASE
1V/div
0
VOUT
0
GAIN
GAIN
-20
-40
-50
-100
GAIN CROSSOVER
FREQUENCY = 12.2kHz
PHASE MARGIN = 59.7°
-20
-40
-50
-100
GAIN CROSSOVER
FREQUENCY = 18.2kHz
PHASE MARGIN = 62.9°
ILX
200mA/div
10ms/div
CONDITIONS: fSW = 600kHz
1k
10k
100k
1k
10k
100k
FREQUENCY (Hz)
FREQUENCY (Hz)
CONDITIONS: PWM MODE, f = 200kHz, 150mA LOAD
CONDITIONS: PWM MODE, fSW = 200kHz, 150mA LOAD
SW
MAX17670E, 3.3V OUTPUT
CLOSED LOOP BODE PLOT
MAX17672C, 5V OUTPUT
CLOSED LOOP BODE PLOT
MAX17671F, 5V OUTPUT
CLOSED LOOP BODE PLOT
FIGURE 8 CIRCUIT
FIGURE 7 CIRCUIT
FIGURE 6 CIRCUIT
toc52
toc51
toc50
40
20
0
100
80
60
40
20
40
20
0
100
80
60
40
20
40
100
80
60
40
20
PHASE
PHASE
PHASE
20
0
GAIN
GAIN
GAIN
-20
-40
GAIN CROSSOVER
FREQUENCY = 23.8kHz
PHASE MARGIN = 59.4°
-20
-40
-20
GAIN CROSSOVER
FREQUENCY = 29.5kHz
PHASE MARGIN = 61.7°
GAIN CROSSOVER
FREQUENCY = 23.4kHz
PHASE MARGIN = 61.5°
-40
1k
10k
100k
1k
10k
100k
1k
10k
100k
FREQUENCY (Hz)
CONDITIONS: PWM MODE, fSW = 600kHz, 150mA LOAD
FREQUENCY (Hz)
CONDITIONS: PWM MODE, fSW = 600kHz, 150mA LOAD
FREQUENCY (Hz)
CONDITIONS: PWM MODE, fSW = 600kHz, 150mA LOAD
MAX17671F, 3.3V LINEAR REGULATOR
LOAD TRANSIENT BETWEEN 1mA AND 25mA
MAX17671F, 3.3VLINEAR REGULATOR
DROPOUT VOLTAGE vs. LOAD CURRENT
toc53
MAX17671F, 3.3VLINEAR REGULATOR
OUTPUT VOLTAGE vs. INPUT VOLTAGE
FIGURE 6 CIRCUIT
toc54
toc55
0.24
3.6
0.20
0.16
0.12
0.08
0.04
0.00
3.3
V
OUTL(AC)
50mV/div
20mA/div
LOAD = 1mA
3.0
LOAD = 5mA
LOAD = 10mA
2.7
LOAD = 25mA
2.4
LOAD = 50mA
I
OUTL
2.1
1.8
2.35
2.88
3.41
INPUT VOLTAGE (V)
CONDITIONS: INL CONNECTED TO EXTERNAL SUPPLY
3.94
4.47
5.00
40µs/div
0
10
20
30
40
50
LOAD CURRENT (mA)
CONDITIONS: INL CONNECTED TO V , PWM MODE
OUT
CONDITIONS: INL CONNECTED TO EXTERNAL SUPPLY
Maxim Integrated
│ 12
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MAX17670, MAX17671,
MAX17672
Integrated 4V-60V, 150mA, High-Efficiency,
Synchronous Step-Down DC-DC Converter
with 50mA Linear Regulator
Typical Operating Characteristics (continued)
(V = 24V, V
= 0V, T = -40°C to +125°C, unless otherwise noted. Typical values are at T = +25°C. All voltages are referenced
IN
GND
A
A
to GND, unless otherwise noted.)
MAX17671F, 3.3V LINEAR REGULATOR
LOAD TRANSIENT BETWEEN 25mA AND 50mA
MAX17671F, 3.3VLINEAR REGULATOR
START-UP FROM EN/UVLO
FIGURE 6 CIRCUIT
MAX17671F, 3.3V OUTPUT LINEAR REGULATOR,
POWER SUPPLY REJECTION RATIO vs. FREQUENCY
70
FIGURE 6 CIRCUIT
toc58
toc56
toc57
60
50
VOUTL(AC)
20mV/div
VEN/UVLO
5V/div
2V/div
VINL = 5V
40
VINL = VOUTL
30
20
VOUTL
IOUTL
2V/div
VINL = 4.3V
10
0
IOUTL
20mA/div
50mA/div
100
1k
10k
100k
1Meg
1ms/div
20µs/div
FREQUENCY (Hz)
CONDITIONS: INL CONNECTED TO VOUT, PWM MODE
CONDITIONS: fSW = 600kHz, 66Ω RESISTIVE LOAD,
INL CONNECTED TO VOUT
CONDITIONS: LOAD = 50mA, INL CONNECTED TO
EXTERNAL SUPPLY
MAX17671F, STEP-DOWN CONVERTER LOAD TRANSIENT
ON 3.3V LINEAR REGULATOR OUTPUT,
MAX17671F, 3.3V LINEAR REGULATOR
OUTPUT VOLTAGE ACCURACY vs. TEMPERATURE,
FIGURE 4 CIRCUIT
MAX17671F, STEP-DOWN CONVERTER LOAD TRANSIENT
ON 3.3V LINEAR REGULATOR OUTPUT,
FIGURE 4 CIRCUIT
FIGURE 4 CIRCUIT
toc60
toc59
toc61
3.34
3.32
VOUTL(AC)
VOUTL(AC)
20mV/div
LOAD = 1mA
LOAD = 100µA
20mV/div
3.30
3.28
3.26
3.24
VOUT(AC)
200mV/div
VOUT(AC)
200mV/div
100mA/div
LOAD = 10mA
LOAD = 50mA
IOUT
100mA/div
IOUT
400µs/div
-40
-10
20
50
80
110
400µs/div
TEMPERATURE (ºC)
CONDITIONS: fSW = 200kHz, PWM MODE, IOUTL = 50mA,
STEP-DOWN CONVERTER LOAD STEP BETWEEN 0mA AND 100mA
CONDITIONS: fSW = 200kHz, PFM MODE, IOUTL = 1mA,
STEP-DOWN CONVERTER LOAD STEP BETWEEN 0mA AND 100mA
CONDITIONS: PWM MODE, INL CONNECTED TO V
OUT
RADIATED EMISSIONS PLOT
5V OUTPUT, 150mA LOAD CURRENT
toc63
toc62
70
70
CISPR22 CLASS B QP LIMIT
60
60
50
40
30
CISPR22 CLASS B AVG LIMIT
50
40
30
CISPR22 CLASS B QP LIMIT
VERTICAL SCAN
20
10
PEAK EMISSIONS
AVERAGE EMISSIONS
20
10
0
0
HORIZONTAL SCAN
-10
30
1
10
30
1000
100
FREQUENCY (MHz)
0.15
FREQUENCY (MHz)
MEASURED ON MAX17672CEVKIT#
with L2 = SHORT, C10 = OPEN
MEASURED ON MAX17672CEVKIT# with
L2 = 8.2µH, C10 = 1µF/100V/X7R/1206
Maxim Integrated
│ 13
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MAX17670, MAX17671,
MAX17672
Integrated 4V-60V, 150mA, High-Efficiency,
Synchronous Step-Down DC-DC Converter
with 50mA Linear Regulator
Pin Configuration
TOP VIEW
IN
1
10 LX
9
8
7
6
GND
EN/UVLO
RT
2
3
4
5
MAX17670
MAX17671
MAX17672
MODE/SYNC
RESET
FBBUCK
OUTL
EP
INL
10-PIN TDFN 3mm x 3mm
Pin Description
PIN
NAME
FUNCTION
1
IN
Power Supply Input of the Step-Down Converter. Decouple the IN pin to GND with an X7R 1μF ceramic capacitor.
Enable/Undervoltage Lockout Input. Drive EN/UVLO high to enable the output voltage. Connect to the midpoint
of a resistor divider from IN to GND to set the input voltage at which the device turns ON. The allowed minimum
turn ON input voltage is 4V. Pull low to GND for disabling the device. See Setting the Input Undervoltage-Lock-
out Level section for more details.
EN/
UVLO
2
3
Programmable Switching Frequency Input. Connect a resistor from RT to GND to program the switching fre-
quency from 200kHz to 2.2MHz. Leave the RT pin unconnected for a default 600kHz switching frequency. See
the Switching Frequency (RT) section for details.
RT
Step-down Converter Feedback Input. For MAX17670 and MAX17671, connect FBBUCK directly to the output
4
5
FBBUCK node of the step-down converter. For the MAX17672, connect FBBUCK to a resistor-divider between the regu-
lated buck-voltage node and GND. See the Adjusting the Output Voltage section for details.
OUTL
INL
Linear Regulator Output Pin. Connect at least 2.2μF, 0603 capacitor across OUTL and GND.
Linear Regulator Power-Supply Input. Connect this pin to the Step-down converter's output capacitor for output
voltages up to 5.5V. Otherwise, the INL pin should be grounded. INL also acts as a bootstrap input to power up
internal blocks for improved efficiency. INL switchover occurs only for INL voltages between 3.3V and 5.5V. See
the Linear Regulator Power-Supply Input (INL) section for details.
6
Open-Drain Reset Output. Pull up RESET to an external power supply with a resistor. The RESET pin is driven
low if either FBBUCK voltage or OUTL voltage drops below 92% of their set value and also when
7
RESET EN/UVLO voltage falls below its threshold value. RESET goes high 2.1ms after FBBUCK and OUTL voltages
rise above 95% of their set value if INL is above V
. Else, RESET considers only FBBUCK voltage for
INL_UVLO
its high impedance state.
Mode Selection and External Clock Synchronization Input. Connect the MODE/SYNC pin to the GND pin to en-
MODE/ able the fixed-frequency PWM operation. Leave MODE/SYNC unconnected for PFM operation. An external clock
8
9
SYNC
can be applied to the MODE/SYNC pin to synchronize the internal clock to the external clock.
See the Mode Selection and External Synchronization (MODE/SYNC) section for details.
Ground. Connect GND to the power ground plane. Connect all the circuit ground connections together at a
single point. See the PCB Layout Guidelines Layout Guidelines section.
GND
Maxim Integrated
│ 14
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MAX17670, MAX17671,
MAX17672
Integrated 4V-60V, 150mA, High-Efficiency,
Synchronous Step-Down DC-DC Converter
with 50mA Linear Regulator
Pin Description (continued)
PIN
NAME
FUNCTION
Switching Node of the Step-Down Converter. Connect LX to the switching side of the inductor. LX is high
impedance when the device is shut down.
10
LX
Exposed Pad. Always connect EP to the GND pin of the IC. Also, connect EP to a large GND plane with
several thermal vias for best thermal performance. Refer to the MAX17670, MAX17671, and MAX17672 EV kit
datasheet for an example of the correct method for EP connection and thermal vias.
―
EP
Functional Diagrams
MAX17670/MAX17671/MAX17672
INTERNAL
LINEAR REGULATOR
IN
INL
BIAS SELECT
POK
CHIPEN
V
CC
EN/UVLO
PEAK LIMIT
V
ENR
CURRENT
CS
CURRENT
SENSE
AMPLIFIER
THERMAL
SHUTDOWN
SENSE
LOGIC
CLK
RT
PFM
PWM/PFM
CONTROL
LOGIC
OSCILLATOR
SLOPE
HIGH-SIDE
DRIVER
DH
DL
R
MODE
LX
V
CC
LOW-SIDE
DRIVER
MODE/SYNC
FBBUCK
MODE SELECTION
LOGIC
*S1
R1
R2
GND
*S3
*S2
CURRENT
SENSE
AMPLIFIER
SINK-LIMIT
ERROR
AMPLIFIER
LOOP
COMPENSATION
SLOPE
SINK CURRENT
LIMIT
CS
INTERNAL
SOFT-
START
CONTROL
INL
CHIPEN
V
FBBUCKR
FBBUCK
RESET
LDO UVLO
LOGIC
FET DRIVER WITH
CURRENT LIMIT
OUTL
RESET
LOGIC
V
OUTLR
R3
R4
OUTL
LDO INTERNAL
SOFT-START
CONTROL
V
INL-UVLO
INL
* S1: CLOSE, S2, S3: OPEN FOR MAX17672
* S1: OPEN, S2, S3: CLOSE FOR MAX17670, MAX17671
R1 = 257.60KΩ, R2 = 82.2KΩ FOR MAX17670
R1 = 432.43KΩ, R2 = 82.2KΩ FOR MAX17671
Maxim Integrated
│ 15
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MAX17670, MAX17671,
MAX17672
Integrated 4V-60V, 150mA, High-Efficiency,
Synchronous Step-Down DC-DC Converter
with 50mA Linear Regulator
a falling edge is detected, the change from PFM to PWM
mode is instantaneous.
Detailed Description
MAX17670, MAX17671, and MAX17672 are dual-output
regulators integrating a 4V to 60V, 150mA high volt-
age, high efficiency, Himalaya synchronous step-down
converter with internal MOSFETs and a high PSRR, low
noise, 2.35V to 5.5V, 50mA linear regulator. MAX17670
and MAX17671 are the fixed 3.3V and 5V step-down con-
verter output voltage devices, respectively. MAX17672 is
the adjustable step-down converter output voltage (0.8V
PWM operation is useful in frequency-sensitive applica-
tions and provides fixed switching frequency at all loads.
However, PWM mode of operation gives lower efficiency
at light loads compared to PFM mode of operation.
PFM mode disables negative inductor current and
additionally skips pulses at light loads for high efficiency.
In PFM mode, the inductor current is forced to a fixed
to 90%V ) device. All three devices feature internal
IN
peak (I
) of 92mA (typ) every clock cycle until the
PFM
compensation. The feedback-voltage regulation accuracy
over -40°C to +125°C temperature range for the linear
regulator is ±1.3% for 3.3V, 3.0V, 2.5V linear regulator
outputs; ±1.5% for 1.8V, 1.5V, 1.2V linear regulator out-
puts; and, ±2% for the step-down converter.
output rises to 102% (typ) of the nominal voltage. Once
the output reaches 102% (typ) of the nominal voltage,
both high-side and low-side FETs are turned off and the
device enters hibernate operation until the load discharg-
es the output to 101% (typ) of the nominal voltage. Most
of the internal blocks are turned off in hibernate operation
to reduce quiescent current. After the output falls below
101% (typ) of the nominal voltage, the device comes
out of hibernate operation, turns on all internal blocks,
and again commences the process of delivering pulses
of energy to the output until it reaches 102% (typ) of the
nominal output voltage. The advantage of PFM mode is
higher efficiency at light loads due to the lower quiescent
currents in PFM mode.
The step-down converter uses an internally compensat-
ed, peak-current mode control architecture. On the rising
edge of the internal clock, the high-side p-MOSFET turns
on. An internal error amplifier compares the feedback volt-
age to a fixed internal reference voltage and generates an
error voltage. The error voltage is compared to a sum of
the current-sense voltage and a slope-compensation volt-
age by a PWM comparator to set the on-time. During the
on-time of the p-MOSFET, the inductor current ramps up.
For the remainder of the switching period (off-time), the
p-MOSFET is kept off and the low-side n-MOSFET turns
on. During the off-time, the inductor releases the stored
energy as the inductor current ramps down, providing cur-
rent to the output.
The device naturally exits PFM mode when the load cur-
rent demands inductor peak current above I
(92mA
PFM
typ). The device enters PFM mode when the load current
is less than half the peak-to-peak inductor ripple current.
The internal oscillator of the device can be synchro-
nized to an external clock signal on the MODE/SYNC
pin. The external synchronization clock frequency must
The step-down converter has a 5.1ms fixed internal
soft-start to reduce the inrush currents. An EN/UVLO pin
allows the user to turn the device on/off at the desired
input-voltage level greater than 4V. An open-drain
RESET pin allows output-voltage monitoring.
be between 1.1 x f
and 1.4 x f , where f
is the
SW
SW
SW
switching frequency programmed by the resistor connect-
ed to the RT pin. When an external clock is applied to the
MODE/SYNC pin, the internal clock synchronizes to the
external clock frequency (from original frequency based
on the RT pin setting) after 8 external pulses are detected
within 16 internal clock cycles. Mode of operation can
Mode Selection and External Synchronization
(MODE/SYNC)
The device features a MODE/SYNC pin for selecting
either forced PWM or PFM mode of operation. If the
MODE/SYNC pin is grounded, the device operates in a
constant-frequency PWM mode at all loads. If the MODE/
SYNC pin is unconnected, the device operates in PFM
mode at light load. When a rising edge is detected at the
MODE/SYNC pin, the internal logic changes the mode
from PWM to PFM after 16 internal clock cycles. When
be reset with a V power cycle or EN/UVLO cycle. The
IN
minimum external clock on-time and off-time pulse-widths
should be greater than 100ns. See the Mode Selection
and External Synchronization (MODE/SYNC) section in
the Electrical Characteristics table for details.
Maxim Integrated
│ 16
www.maximintegrated.com
MAX17670, MAX17671,
MAX17672
Integrated 4V-60V, 150mA, High-Efficiency,
Synchronous Step-Down DC-DC Converter
with 50mA Linear Regulator
Linear Regulator Power-Supply Input (INL)
Startup Into a Prebiased Step-Down Convert-
er Output
The INL pin can be tied to the step-down converter output
node for voltages up to 5.5V. Otherwise, INL should be
connected to GND.
The device supports monotonic startup into a prebiased
step-down converter output. When the device starts into a
prebiased output, both the high-side and low-side switch-
es are turned off so that the converter does not sink cur-
rent from the output. High-side and low-side switches do
not start switching until the PWM comparator commands
the first PWM pulse, at which switching commences. The
output voltage is then smoothly ramped up to the target
The linear regulator operates from 2.35V to 5.5V input-
voltage range and the linear regulator is enabled when
V
INL
is more than V
.
INL_UVLO
The INL pin also functions as bootstrap input to power up
the internal blocks. Switchover to bootstrap input occurs
when V
is above V
. This improves the overall
INL
INL_TH
value in alignment with the internal reference. Such a
feature is useful in applications where digital integrated
circuits with multiple rails are powered.
efficiency, since the internal blocks are being powered
from the step-down converter output which has the volt-
age less than the input voltage.
RESET Output
Enable/Undervoltage-Lockout Input
(EN/UVLO) and Soft-Start
When EN/UVLO voltage increases above V
The device includes an open-drain RESET output to
monitor step-down converter output voltage and linear
regulator output voltage. The RESET pin should be pulled
up with an external resistor to the desired external power
supply.
(1.215V
ENR
typ), the device initiates a built-in 5.1ms (typ) soft-start
period after an internal delay of 400μs (t ), allowing a
1
monotonic increase of the output voltage to the final set
value.
RESET goes to high impedance 2.1ms after both step-
down converter and linear regulator outputs rise above
EN/UVLO can be used as an input-voltage UVLO adjust-
ment input, to set the turn-on/off input-voltage level. The
allowed minimum turn-on/off input voltage is 4V. See the
Setting the Input Undervoltage-Lockout Level section
for details. Driving EN/UVLO low disables both power
MOSFETs, as well as other internal circuitry, and reduces
quiescent current to around 2.5μA. If the EN/UVLO pin is
driven from an external signal source, a series resistance
of 1kΩ (min) is recommended to be placed between
the output of the signal source and the EN/UVLO pin to
reduce voltage ringing on the line.
95% of their nominal set value, if V
Otherwise, RESET only considers step-down converter
output voltage for its high impedance state.
is above V
.
INL
INL_UVLO
RESET pulls low after 4μs (t ) if one of the either output
2
voltages fall below 92% of their set value. RESET is
also driven low when EN/UVLO voltage falls below its
threshold value. Figure 1 shows the RESET output timing
diagram.
V
ENR
V
ENF
EN/UVLO
t
1
V
V
FBBUCKR
FBBUCKF
*a
V
=V
INL OUT
t
SS1
V
V
OUTLR
OUTLF
V
OUTL
t
SS2
RESET
t
t
2
t
D
D
t
2
*a : V
IS POWERED UP AFTER V HAS REACHED V
INL INL-UVLO
OUTL
Figure 1. RESET Output Logic Diagram
Maxim Integrated
│ 17
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MAX17670, MAX17671,
MAX17672
Integrated 4V-60V, 150mA, High-Efficiency,
Synchronous Step-Down DC-DC Converter
with 50mA Linear Regulator
I
= Maximum load current,
Switching Frequency (RT)
OUT(MAX)
Switching frequency of the device can be programmed
from 200kHz to 2.2MHz by using a resistor connected
R
= Maximum DC resistance of the inductor,
DCR(MAX)
f
= Maximum switching frequency,
SW(MAX)
from RT to GND. The switching frequency (f ) is related
SW
t
= Worst case minimum switch off-time (75ns),
OFF_MIN(MAX)
to the resistor (R ) connected at the RT pin by the fol-
RT
t
= Worst-case minimum switch on-time (128ns),
lowing equation:
RRT
ON_MIN(MAX)
R
and R
= Maximum on-state
DS-ONL(MAX)
DS-ONH(MAX)
500
≈
resistances of the low-side and high-side MOSFETs,
respectively.
11.6
− 0.045
− 0.5
t
SW
Overcurrent Protection
1
The device implements a hysteretic peak current-limit
protection scheme to protect the internal FETs and induc-
tor under output short-circuit conditions. When the induc-
tSW
=
f
SW
Where R
is in kΩ and t
is in μs. Leave the RT pin
SW
tor peak current exceeds I
(0.295A typ), the
RT
PEAK-LIMIT
unconnected for the default 600kHz switching frequency.
The value of R in the range of 165kΩ (308kHz) and
248kΩ (215kHz) is not allowed for user programming to
ensure proper configuration of the internal adaptive-loop
compensation scheme. The maximum allowable switch-
ing frequency for PFM mode of operation is 900kHz.
high-side switch is turned off and the low-side switch is
turned on to reduce the inductor current. After the current
is reduced to 150mA (typ), the high-side switch is turned
on at the rising edge of the next clock pulse. The device
RT
enters hiccup mode if the inductor current hits I
PEAK-
for 16 consecutive times. After the hiccup time-out
LIMIT
period, the device auto retries to startup and the same
operation continues until the short is removed and the
Operating Input-Voltage Range
The maximum operating input voltage is determined by
the minimum on-time, and the minimum operating input
voltage is determined by the maximum duty cycle and
circuit voltage drops. The minimum and maximum oper-
ating input voltages for a given output voltage should be
calculated as follows:
inductor peak current goes below I
. Since the
PEAK-LIMIT
inductor current is bounded between the two values, the
inductor current runaway never happens in this scheme.
Low Side-Switch Protection
Hysteretic-sink current limit controls the low-side switch
sink current to I
50mA.
(105mA typ) with a ripple of
SINK-LIMIT
V
+ ( I
×(R
+ R
))
OUT
OUT(MAX)
DCR(MAX)
DS-ONL(MAX)
× f
SW(MAX)
VIN(MIN)
=
1 – t
OFF_MIN(MAX)
Thermal-Shutdown Protection
+ (I
× (R
– R
))
DS – ONL(MAX)
OUT(MAX)
DS-ONH(MAX)
Thermal-shutdown protection limits the junction tem-
perature in the IC. This feature is present in PWM mode.
When the junction temperature exceeds +160°C, an on-
chip thermal sensor shuts down the device, turns off the
internal power MOSFETs and the linear regulator, allow-
ing the device to cool down. The device turns on with
soft-start after the junction temperature reduced by 20°C.
V
OUT
VIN(MAX)
=
f
× t
ON_MIN(MAX)
SW(MAX)
where:
= Steady-state output voltage,
V
OUT
Maxim Integrated
│ 18
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MAX17670, MAX17671,
MAX17672
Integrated 4V-60V, 150mA, High-Efficiency,
Synchronous Step-Down DC-DC Converter
with 50mA Linear Regulator
D = V
/V is the duty ratio of the controller,
OUT IN
Applications Information
f
= Switching frequency,
SW
Inductor Selection
Three key inductor parameters must be specified for
operation with the device: inductance value (L), inductor
∆V = Allowable input voltage ripple,
IN
η = Efficiency
saturation current (I
switching frequency and output voltage determine the
inductor value as follows:
), and DC resistance (R
). The
SAT
DCR
In applications where the source is located distant from the
device input, an electrolytic capacitor should be added in
paralleltotheceramiccapacitortoprovidenecessarydamp-
ingforpotentialoscillationscausedbytheinductanceofthe
longer input power path and input ceramic capacitor.
8150× V
OUT
L=
f
SW
Output Capacitor Selection for Step-Down
Converter
where:
L = Inductance in μH,
= Output voltage
X7R ceramic output capacitors are recommended for the
device due to their stability over the temperature in indus-
trial applications. The output capacitor has two functions.
It stores sufficient energy to support the output voltage
under load transient conditions and stabilizes the device’s
internal control loop. The output capacitor is sized to sup-
port a step load of 50mA such that the output-voltage
deviation is less than 3%. The minimum required output
capacitance can be calculated as shown in Table 1.
V
OUT
f
= Switching frequency in kHz
SW
Select a low-loss inductor closest to the calculated value
with acceptable dimensions and having the lowest pos-
sible DC resistance. The saturation current rating (I
the inductor must be high enough to ensure that saturation
can occur only above the peak current-limit (I
) of
SAT
).
PEAK-LIMIT
Input Capacitor Selection
It should be noted that dielectric materials used in ceramic
capacitors exhibit capacitance loss due to DC bias levels.
It should be that the derated value of the selected capaci-
tance meets the minimum required output capacitance.
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.
The input capacitor RMS current requirement (I
defined by the following equation:
) is
RMS
Linear Regulator Output Capacitor Selection
For stable operation over the full temperature range, use
a low-ESR 2.2μF X7R ceramic capacitor at the OUTL pin.
Ceramic capacitors exhibit capacitance and ESR varia-
tions over temperature. Ensure that the minimum capaci-
tance under worst-case conditions does not drop below
1μF for linear regulator output stability.
V
× V – V
(
)
OUT
IN
OUT
I
= I
×
OUT(MAX)
RMS
V
IN
where, I
is the maximum load current. I
a maximum value when the input voltage equals twice
the output voltage (V = 2 x V ), so I
has
RMS
OUT(MAX)
=
RMS(MAX)
IN
OUT
I
/1.414. Choose an input capacitor that exhibits
OUT(MAX)
Table 1. Output Capacitor Selection
less than +10°C temperature rise at the RMS input cur-
rent for optimal long-term reliability. Use low-ESR ceramic
capacitors with high ripple-current capability at the input.
X7R capacitors are recommended in industrial applica-
tions for their temperature stability. Calculate the input
capacitance using the following equation:
FREQUENCY RANGE
(KHZ)
MINIMUM OUTPUT
CAPACITANCE (μF)
20
200 to 215
V
V
OUT
I
× D ×(1– D)
13
OUT(MAX)
C
=
308 to 2200
IN
η × f
× ∆V
OUT
SW
IN
where:
Maxim Integrated
│ 19
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MAX17670, MAX17671,
MAX17672
Integrated 4V-60V, 150mA, High-Efficiency,
Synchronous Step-Down DC-DC Converter
with 50mA Linear Regulator
Setting the Input Undervoltage-Lockout Level
Linear Regulator Output Voltage Options
The device offers an adjustable input undervoltage-lock-
out level. Set the voltage at which the device turns on with
a resistive voltage-divider connected from IN to GND (see
Figure 2). Connect the center node of the divider to EN/
UVLO. Choose R1 to be 3.3MΩ (max) and then calculate
R2 as follows:
3.3V (MAX17671 and MAX17672 only), 3.0V, 2.5V, 1.8V,
1.5V, and 1.2V linear regulator output voltage options are
supported. See Ordering Information for details.
Power Dissipation
At a particular operating condition, the power losses that
lead to the temperature rise of the device are estimated
as follows:
R1×1.215
R2=
V
– 1.215
(
)
INU
P
= P
+ P
LOSS
BUCK LDO
where V
is the voltage greater than 4V above which
INU
1
2
the device is required to turn on.
P
= V
× I
×
– 1 – I
× R
OUT DCR
)
BUCK
OUT
OUT
(
η
P
Adjusting the Output Voltage
= V
(
– V
×I
)
LDO
INL
OUTL
OUTL
For MAX17670 and MAX17671, connect FBBUCK directly
to the output node of the step-down converter. The output
voltage of MAX17672 can be programmed from 0.8V to
where:
0.9 x V . Set the output voltage by connecting a resistor
IN
V
I
= Step-down converter output voltage,
= Step-down converter load current,
OUT
divider from output node to FBBUCK to GND (see Figure 3).
Choose R2 less than or equal to 100kΩ and calculate R1
with the following equation:
OUT
η = Efficiency of step-down converter power conversion,
V
V
V
= LDO-input voltage,
= LDO-output voltage,
OUT
0.8
INL
R1= R2 ×
– 1
OUTL
OUTL
I
= LDO load current
R
= DC resistance of the output inductor.
DCR
V
IN
IN
See the Typical Operating Characteristics for the
power-conversion efficiency or measure the efficiency
to determine the total power dissipation. For a typical
multi-layer board, the thermal performance metrics for the
package are given below:
MAX17670
MAX17671
MAX17672
R1
R2
EN/UVLO
°
θ
JA
= 41 C/W
°
GND
θ
JC
= 9 C/W
The junction temperature (T ) of the device can be esti-
J
Figure 2. Adjustable EN/UVLO Network
mated at any ambient temperature (T ) from the following
A
equation:
T = T + (θ x P )
LOSS
V
OUT
J
A
JC
If the application has a thermal-management system that
ensures that the exposed pad of the device is maintained
R1
MAX17672
at a given temperature (T
) by using proper heat
EP(MAX)
FBBUCK
sinks, then the junction temperature of the device can be
estimated at any given maximum ambient temperature as
R2
GND
T
= T
+ (θ x P
)
J(MAX)
EP(MAX)
JC
LOSS
°
Note: Junction Temperature greater than +125 C degrades
operating lifetimes
Figure 3. Setting the Output Voltage
Maxim Integrated
│ 20
www.maximintegrated.com
MAX17670, MAX17671,
MAX17672
Integrated 4V-60V, 150mA, High-Efficiency,
Synchronous Step-Down DC-DC Converter
with 50mA Linear Regulator
● Route the high-speed switching node (LX) away from
PCB Layout Guidelines
the signal pins
Careful PCB layout is critical to achieve clean and stable
operation. The switching power stage requires particular
attention.
● Place the linear regulator output capacitor close to
the OUTL pin
The following are the guidelines for a good PCB layout:
●
A number of thermal throughputs that connect to a
large ground plane should be provided under the
exposed pad of the device for efficient heat
dissipation.
● Place the input ceramic capacitor as close as
possible to the IN and GND pins
● Minimize the area formed by the LX pin and inductor
For a sample layout that ensures first pass success, refer
to the MAX17670, MAX17671 and MAX17672 evaluation
kit PCB layout available at www.maximintegrated.com.
connection to reduce the radiated EMI
● Ensure that all feedback connections are short and
direct
Typical Application Circuits
MAX17671 High-Efficiency 5V Output
L1
220µH
V
IN
6.5V TO 60V
V
OUT
IN
LX
5V, 100mA
C3
10µF
R1
3.32MΩ
C1
1µF
EN/UVLO
R2
GND
787kΩ
MAX17671F
V
OUTL
3.3V, 50mA
OUTL
FBBUCK
C2
2.2µF
RESET
MODE/SYNC
RT
INL
EP
R1
274kΩ
L1 : LPS6235-224MR
C1 : 1.0µF/X7R/100V/1206
C2 : 2.2µF/X7R/10V/0603 (GRM188R71A225KE15)
C3 : 10µF/X7R/25V/0805 (GRM21BZ71E106KE15)
MODE/SYNC:
CONNECT TO GND FOR PWM MODE
UNCONNECTED FOR PFM MODE
f
: 200kHz
SW
Figure 4. Fixed 5V Step-Down Converter Output at 200kHz Switching Frequency and 3.3V Linear Regulator Output
Maxim Integrated
│ 21
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MAX17670, MAX17671,
MAX17672
Integrated 4V-60V, 150mA, High-Efficiency,
Synchronous Step-Down DC-DC Converter
with 50mA Linear Regulator
Typical Application Circuits (continued)
MAX17670 High-Efficiency 3.3V Output
L1
150µH
V
IN
4.5V TO 60V
V
OUT
IN
LX
3.3V, 130mA
C3
10µF
R1
3.32MΩ
C1
1µF
EN/UVLO
R2
GND
1.27MΩ
MAX17670E
V
OUTL
3V, 20mA
OUTL
FBBUCK
C2
2.2µF
RESET
MODE/SYNC
RT
INL
R1
274kΩ
EP
L1 : LPS6235-154MR
C1 : 1.0µF/X7R/100V/1206
MODE/SYNC:
CONNECT TO GND FOR PWM MODE
UNCONNECTED FOR PFM MODE
C2 : 2.2µF/X7R/10V/0603 (GRM188R71A225KE15)
C3 : 10µF/X7R/10V/0805 (GRM21BR71A106KA73)
f
: 200kHz
SW
Figure 5. Fixed 3.3V Step-Down Converter Output at 200kHz Switching Frequency and 3.0V Linear Regulator Output
MAX17671 Small-Footprint 5V Output
L1
68µH
V
IN
6.5V TO 60V
V
OUT
IN
LX
5V, 100mA
C3
4.7µF
R1
3.32MΩ
C1
1µF
EN/UVLO
R2
GND
787kΩ
MAX17671F
V
OUTL
3.3V, 50mA
OUTL
FBBUCK
C2
2.2µF
RESET
MODE/SYNC
RT
INL
EP
L1 : LPS3015-683MR
C1 : 1.0µF/X7R/100V/1206
MODE/SYNC:
CONNECT TO GND FOR PWM MODE
UNCONNECTED FOR PFM MODE
C2 : 2.2µF/X7R/10V/0603 (GRM188R71A225KE15)
C3 : 4.7µF/X7R/16V/0603 (GRM188Z71C475KE21)
f
: 600kHz
SW
Figure 6. Fixed 5.0V Step-Down Converter Output at 600kHz Switching Frequency and 3.3V Linear Regulator Output
Maxim Integrated
│ 22
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MAX17670, MAX17671,
MAX17672
Integrated 4V-60V, 150mA, High-Efficiency,
Synchronous Step-Down DC-DC Converter
with 50mA Linear Regulator
Typical Application Circuits (continued)
MAX17670 Small-Footprint 3.3V Output
L1
47µH
V
IN
4.5V TO 42V
V
OUT
IN
LX
3.3V, 130mA
C3
4.7µF
R1
3.32MΩ
C1
1µF
EN/UVLO
R2
GND
1.27MΩ
OUTL
MAX17670E
V
3V, 20mA
OUTL
FBBUCK
C2
2.2µF
RESET
MODE/SYNC
INL
RT
EP
L1 : LPS3015-473MR
C1 : 1.0µF/X7R/100V/1206
MODE/SYNC:
CONNECT TO GND FOR PWM MODE
UNCONNECTED FOR PFM MODE
C2 : 2.2µF/X7R/10V/0603 (GRM188R71A225KE15)
C3 : 4.7µF/X7R/16V/0603 (GRM188Z71C475KE21)
f
: 600kHz
SW
Figure 7. Fixed 3.3V Step-Down Converter Output at 600kHz Switching Frequency and 3.0V Linear Regulator Output
MAX17672 Small-Footprint 5V Output
L1
68µH
V
IN
6.5V TO 60V
V
OUT
IN
LX
5V, 100mA
C3
4.7µF
R1
3.32MΩ
C1
1µF
EN/UVLO
R2
GND
787kΩ
MAX17672C
R3
261kΩ
V
OUTL
1.8V, 50mA
OUTL
FBBUCK
R4
49.9kΩ
C2
2.2µF
RESET
MODE/SYNC
RT
V
INL
OUT
EP
L1 : LPS3015-683MR
C1 : 1.0µF/X7R/100V/1206
MODE/SYNC:
CONNECT TO GND FOR PWM MODE
UNCONNECTED FOR PFM MODE
C2 : 2.2µF/X7R/10V/0603 (GRM188R71A225KE15)
C3 : 4.7µF/X7R/16V/0603 (GRM188Z71C475KE21)
f
: 600kHz
SW
Figure 8. Adjustable 5.0V Step-Down Converter Output at 600kHz Switching Frequency and 1.8V Linear Regulator Output
Maxim Integrated
│ 23
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MAX17670, MAX17671,
MAX17672
Integrated 4V-60V, 150mA, High-Efficiency,
Synchronous Step-Down DC-DC Converter
with 50mA Linear Regulator
Ordering Information
BUCK OUTPUT
VOLTAGE (V)
LINEAR REGULATOR OUTPUT
PIN PACKAGE
PART NUMBER
VOLTAGE (V)
MAX17670AATB+*
MAX17670BATB+*
MAX17670CATB+*
MAX17670DATB+*
MAX17670EATB+
MAX17670EATB+T
MAX17671AATB+*
MAX17671BATB+*
MAX17671CATB+*
MAX17671DATB+*
MAX17671EATB+*
MAX17671FATB+
MAX17671FATB+T
MAX17672AATB+*
MAX17672BATB+*
MAX17672CATB+
MAX17672CATB+T
MAX17672DATB+*
MAX17672EATB+*
MAX17672FATB+
MAX17672FATB+T
3.3
1.2
1.5
1.8
2.5
3.0
3.0
1.2
1.5
1.8
2.5
3.0
3.3
3.3
1.2
1.5
1.8
1.8
2.5
3.0
3.3
3.3
10-Pin TDFN
10-Pin TDFN
10-Pin TDFN
10-Pin TDFN
10-Pin TDFN
10-Pin TDFN
10-Pin TDFN
10-Pin TDFN
10-Pin TDFN
10-Pin TDFN
10-Pin TDFN
10-Pin TDFN
10-Pin TDFN
10-Pin TDFN
10-Pin TDFN
10-Pin TDFN
10-Pin TDFN
10-Pin TDFN
10-Pin TDFN
10-Pin TDFN
10-Pin TDFN
3.3
3.3
3.3
3.3
3.3
5
5
5
5
5
5
5
Adjustable
Adjustable
Adjustable
Adjustable
Adjustable
Adjustable
Adjustable
Adjustable
*Future product—contact factory for availability.
+Denotes a lead(Pb)-free/RoHS compliant package.
T=Tape-and-reel.
Maxim Integrated
│ 24
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MAX17670, MAX17671,
MAX17672
Integrated 4V-60V, 150mA, High-Efficiency,
Synchronous Step-Down DC-DC Converter
with 50mA Linear Regulator
Revision History
REVISION REVISION
PAGES
DESCRIPTION
CHANGED
NUMBER
DATE
0
6/18
Initial release
—
Updated Absolute Maximum Ratings, Electrical Characteristics, TOC55–TOC56,
TOC58, Pin Description, Functional Diagram, Linear Regulator Power-Supply Input
(INL), Figure 1, and Figure 8; added TOC59–TOC61; Removed future product
designation from MAX17670EATB+ and MAX17672CATB+
2–3, 13–15
17, 23–24
1
2
11/18
4/20
Updated the General Description, Benefits and Features, Simplified Block Diagram,
Electrical Characteristics, Pin Description, Detailed Description, Linear Regulator Power-
Supply Input (INL), and RESET Output sections; Updated TOC41–TOC42, TOC44–
TOC45 and TOC48–TOC52, and added TOC62–TOC63; Removed future product
designation from MAX17672FATB+, and added MAX17670EATB+T, MAX17671FATB+T,
MAX17672CATB+T and MAX17672FATB+T to the Ordering Information table
1, 3, 5, 11–14
16–17, 24
For pricing, delivery, and ordering information, please visit Maxim Integrated’s online storefront at https://www.maximintegrated.com/en/storefront/storefront.html.
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.
2020 Maxim Integrated Products, Inc.
│ 25
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