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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
The Himalaya series of voltage regulator ICs, power
modules, and chargers enable cooler, smaller, and simpler 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 stepdown converter is adjustable (0.8V up to 90% of VIN).
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.
Applications
●●
●●
●●
●●
Industrial Sensors and Process Control
High-Voltage Linear Regulator Replacement
Battery-Powered Equipment
HVAC and Building Control
Simplified Application Circuit
LX
IN
C1
GND
MAX17670/
MAX17671
R2
C2
FBBUCK
OUTL
MODE/SYNC
RT
19-100364; Rev 2; 4/20
●● 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
●● Reduces Power Dissipation
• 50μA No-Load Supply Current
• PFM Enables Enhanced Light-Load Efficiency
• 2.5μA Shutdown Current
• Bootstrap Bias Input for Improved Efficiency
L1
VOUT
C3
R1
EN/UVLO
VOUTL
●● 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
●● Reliable Operation in Adverse Environments
• Peak Current-Limit Protection
• Built-In Output-Voltage Monitoring with RESET
• Resistor Programmable EN/UVLO Threshold
• Monotonic Startup into Prebiased Load
• Overtemperature Protection
• High Industrial -40°C to +125°C Ambient Operating
Temperature Range / -40°C to +150°C Junction
Temperature Range
Ordering Information appears at end of data sheet.
VIN
Benefits and Features
EP
RESET
INL
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
INL to GND........................-5.5V to lower of (VIN + 0.6V) or +6V
FBBUCK to GND (MAX17670, MAX17671)............-5.5V to +6V
FBBUCK to GND (MAX17672)................................-0.3V to +6V
INL to FBBUCK...........................................................-5V to +6V
Linear Regulator and Step-Down Converter
Output Short-Circuit Duration.................................Continuous
Continuous Power Dissipation
(TA = +70°C, derate 24.4mW/°C above +70°C.)........1952mW
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
Outline Number
21-0137
Land Pattern Number
90-0003
THERMAL RESISTANCE, FOUR-LAYER BOARD:
Junction to Ambient (θJA)
41°C/W
Junction to Case (θJC)
9°C/W
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.
www.maximintegrated.com
Maxim Integrated │ 2
MAX17670, MAX17671,
MAX17672
Integrated 4V-60V, 150mA, High-Efficiency,
Synchronous Step-Down DC-DC Converter
with 50mA Linear Regulator
Electrical Characteristics
(VIN = VEN/UVLO = 24V, VINL= 5V, VFBBUCK = 1.05 x VFBBUCK-REG, COUTL = 2.2μF to GND, VGND = 0V, RT = LX = MODE/SYNC =
RESET = unconnected, TA = -40°C to +125°C, unless otherwise noted. Typical values are at TA = +25°C. All voltages are referenced
to GND, unless otherwise noted.) (Note 2)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
60
V
4.5
μA
INPUT SUPPLY (IN)
Input-Voltage Range
Input-Shutdown Current
VIN
IIN-SH
4
VEN/UVLO = 0V, TA = +25°C
2.5
IQ-PFM
Input-Quiescent Current
IQ-PWM
70
VFBBUCK = 0.95 x VFBBUCK-REG, Normal
switching mode, VINL = 0V
1336
VFBBUCK = 0.95 x VFBBUCK-REG, Normal
switching mode, VINL = 5V
1000
μA
ENABLE/UVLO (EN/UVLO)
EN/UVLO Threshold
EN/UVLO Input-Leakage Current
VENR
VEN/UVLO rising
1.19
1.215
1.24
VENF
VEN/UVLO falling
1.068
1.09
1.112
IENLKG
VEN/UVLO = 1.3V, TA = 25°C
-100
VINL_TH
INL rising
2.725
V
100
nA
3.21
V
EXTERNAL BIAS (INL)
INL Switch Over Voltage
INL Switch Over Hysteresis
VINL_HYS
3
0.17
INL Operating Voltage Range
V
3.21
5.5
V
HIGH-SIDE MOSFET AND LOW-SIDE MOSFET DRIVER
High-Side pMOS
On-Resistance
RDS-ONH
ILX = 0.1A (Sourcing)
2.7
5.1
Ω
Low-Side nMOS
On-Resistance
RDS-ONL
ILX = 0.1A (Sinking)
1.33
2.7
Ω
LX-Leakage Current
ILX_LKG
VEN = 0V, VLX = (VGND +1V) to (VIN - 1V),
TA = 25°C
+1
μA
ms
-1
SOFT-START
Soft-Start Time
tSS1
4.4
5.1
5.8
MODE/SYNC = GND, MAX17670
3.216
3.3
3.365
MODE/SYNC = unconnected, MAX17670
3.216
3.35
3.425
MODE/SYNC = GND, MAX17671
4.887
5
5.087
MODE/SYNC = unconnected, MAX17671
4.887
5.075
5.188
MODE/SYNC = GND, MAX17672
0.782
0.8
0.814
MODE/SYNC = unconnected, MAX17672
0.782
0.812
0.830
STEP-DOWN CONVERTER FEEDBACK (FBBUCK)
FBBUCK Regulation Voltage
FBBUCK Input-Bias Current
www.maximintegrated.com
VFBBUCKREG
IFBBUCK
MAX17670, MAX17671
MAX17672
10
-100
V
μA
100
nA
Maxim Integrated │ 3
MAX17670, MAX17671,
MAX17672
Integrated 4V-60V, 150mA, High-Efficiency,
Synchronous Step-Down DC-DC Converter
with 50mA Linear Regulator
Electrical Characteristics (continued)
(VIN = VEN/UVLO = 24V, VINL= 5V, VFBBUCK = 1.05 x VFBBUCK-REG, COUTL = 2.2μF to GND, VGND = 0V, RT = LX = MODE/SYNC =
RESET = unconnected, TA = -40°C to +125°C, unless otherwise noted. Typical values are at TA = +25°C. All voltages are referenced
to GND, unless otherwise noted.) (Note 2)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
245
295
345
mA
65
105
145
CURRENT LIMIT
Peak Current-Limit Threshold
IPEAK-LIMIT
Sink Current-Limit Threshold
ISINK-LIMIT
PFM Current-Limit Threshold
IPFM
MODE/SYNC = GND
1
55
92
mA
120
mA
+11
%
OSCILLATOR (RT)
Switching Frequency Accuracy
Switching Frequency
fSW = 200kHz to 2.2MHz
fSW
Switching Frequency
Adjustable Range
-11
536
See the Switching Frequency (RT)
section for details
610
680
200
2200
kHz
TIMING
Minimum On-Time
tON_MIN
Minimum Off-Time
tOFF_MIN
tOFF_
Minimum Off-Time during SYNC
Mode of Operation
MIN(SYNC)
75
128
ns
40
55
75
ns
48
75
100
ns
HICCUP Timeout
51
ms
MODE/SYNC
MODE/SYNC Internal
Pullup Resistor
RMODE
Mode = PFM
32
Mode = PWM
1100
SYNC Input Frequency
1.1 x
fSW
Minimum SYNC Pulse Width
100
SYNC Threshold
RESET
VIH
1.4 x
fSW
ns
2.1
VIL
0.8
IRESET = 10mA
RESET Output-Level Low
TA = +25°C, VRESET = 5.5V
RESET Output-Leakage Current
kΩ
-100
400
mV
100
nA
FBBUCK Threshold for RESET
Rising
VFBBUCKR
FBBUCK rising (Note 3)
92
95
98
FBBUCK Threshold for RESET
Falling
VFBBUCKF
FBBUCK falling (Note 3)
89
92
95
%
OUTL Threshold for RESET
Rising
VOUTLR
OUTL rising (Note 3)
91.5
94.5
97.5
OUTL Threshold for RESET
Falling
VOUTLF
OUTL falling (Note 3)
88
91
94
www.maximintegrated.com
V
Maxim Integrated │ 4
MAX17670, MAX17671,
MAX17672
Integrated 4V-60V, 150mA, High-Efficiency,
Synchronous Step-Down DC-DC Converter
with 50mA Linear Regulator
Electrical Characteristics (continued)
(VIN = VEN/UVLO = 24V, VINL= 5V, VFBBUCK = 1.05 x VFBBUCK-REG, COUTL = 2.2μF to GND, VGND = 0V, RT = LX = MODE/SYNC =
RESET = unconnected, TA = -40°C to +125°C, unless otherwise noted. Typical values are at TA = +25°C. All voltages are referenced
to GND, unless otherwise noted.) (Note 2)
PARAMETER
RESET Delay after FBBUCK
and VOUTL Reach 95%
Regulation
SYMBOL
tD
CONDITIONS
MIN
See Reset Output (RESET) section
for details
TYP
MAX
2.1
UNITS
ms
LINEAR REGULATOR INPUT SUPPLY (INL)
Linear Regulator Input-Voltage
Range
Linear Regulator Input-Quiescent
Current
VINL
IINL
Linear Regulator UVLO
VINL_UVLO
Linear Regulator UVLO
Hysteresis
VINL_
UVLO(HYS)
2.35
5.5
IOUTL = 0A, VINL = 5, VFFBUCK = 0.95 ×
VFFBUCK-REG, Normal Switching mode.
710
IOUTL = 0A, VINL = 2.5
35
V
μA
2.11
2.18
2.25
50
V
mV
LINEAR REGULATOR OUTPUT VOLTAGE (OUTL)
OUTL Accuracy
Load Regulation
Dropout Voltage
Linear Regulator Current Limit
Soft-Start Time
VDO
ILDO_LIM
VINL = 2.8V, IOUTL = 10mA,
VOUTL = 1.2V, 1.5V, 1.8V
-1.5
VINL = VOUTL + 0.8V, IOUTL = 10mA,
VOUTL = 2.5V, 3.0V, 3.3V
-1.33
+1.5
%
+1.33
0.1mA < IOUTL < 50mA. VINL = 2.8V for
VOUTL = 1.2V, 1.5V, 1.8V; VINL = VOUTL
+0.8V for VOUTL = 2.5V, 3.0V, 3.3V
0.5
0.9
%
VINL = VOUTL, IOUTL = 50mA (Note 4)
200
400
mV
VOUTL = 70% of nominal value,
VINL = VOUTL + 2V
tSS2
55
84
mA
1.1
ms
160
°C
20
°C
THERMAL SHUTDOWN
Thermal-Shutdown Threshold
Thermal-Shutdown Hysteresis
Temperature rising
Note 2: All the Electrical Specifications are 100% production tested at TA = +25°C. Specifications over the operating temperature
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.
www.maximintegrated.com
Maxim Integrated │ 5
MAX17670, MAX17671,
MAX17672
Integrated 4V-60V, 150mA, High-Efficiency,
Synchronous Step-Down DC-DC Converter
with 50mA Linear Regulator
Typical Operating Characteristics
(VIN = 24V, VGND = 0V, TA = -40°C to +125°C, unless otherwise noted. Typical values are at TA = +25°C. All voltages are referenced
to GND, unless otherwise noted.)
100
MAX17671F, 5V OUTPUT
EFFICIENCY vs. LOAD CURRENT
FIGURE 4 CIRCUIT
MAX17671F, 5V OUTPUT
EFFICIENCY vs. LOAD CURRENT
FIGURE 4 CIRCUIT
100
toc01
80
VIN = 60V
VIN = 12V
50
VIN = 6.5V
40
20
10
10
5.15
toc04
VIN = 6.5V
5.00
0.010
0.100
LOAD CURRENT (A)
CONDITIONS: PFM MODE, fSW = 200kHz
toc05
EFFICIENCY (%)
5.05
VIN = 60V
5.00
0.05
0.10
LOAD CURRENT (A)
CONDITIONS: PFM MODE, fSW = 200kHz
MAX17670E, 3.3V OUTPUT
LOAD AND LINE REGULATION
FIGURE 5 CIRCUIT
3.33
0.00
0.05
0.10
LOAD CURRENT (A)
CONDITIONS: PWM MODE, fSW = 200kHz
0.15
toc06
80
VIN = 36V
VIN = 24V
60
VIN = 12V
50
40
VIN = 48V
VIN = 60V
VIN = 4.5V
70
VIN = 36V
VIN = 24V
40
30
20
10
10
0.05
0.10
LOAD CURRENT (A)
CONDITIONS: PWM MODE, fSW = 200kHz
VIN = 48V
50
20
0.00
VIN = 60V
60
30
0.15
VIN = 48V
VIN = 24V
90
70
0
VIN = 60V
100
80
VIN = 48V
VIN = 36V
MAX17670E, 3.3V OUTPUT
EFFICIENCY vs. LOAD CURRENT
FIGURE 5 CIRCUIT
90
VIN = 36V
VIN = 12V
5.01
100
VIN = 24V
0.00
VIN = 12V
MAX17670E, 3.3V OUTPUT
EFFICIENCY vs. LOAD CURRENT
FIGURE 5 CIRCUIT
VIN = 12V
OUTPUT VOLTAGE (V)
toc03
5.02
VIN = 6.5V
0
0.001
0.15
VIN = 6.5V
5.10
VIN = 24V
40
20
MAX17671F, 5V OUTPUT
LOAD AND LINE REGULATION
FIGURE 4 CIRCUIT
VIN = 36V
50
30
0.05
0.10
LOAD CURRENT (A)
CONDITIONS: PWM MODE, fSW = 200kHz
VIN = 48V
60
30
0.00
VIN = 60V
70
5.03
OUTPUT VOLTAGE (V)
EFFICIENCY (%)
VIN = 48V
VIN = 24V
60
EFFICIENCY (%)
VIN = 36V
70
EFFICIENCY (%)
80
4.95
5.04
toc02
90
90
0
MAX17671F, 5V OUTPUT
LOAD AND LINE REGULATION
FIGURE 4 CIRCUIT
VIN = 12V
VIN = 4.5V
0
0.001
0.15
0.010
0.100
LOAD CURRENT (A)
CONDITIONS: PFM MODE, fSW = 200kHz
MAX17670E, 3.3V OUTPUT
LOAD AND LINE REGULATION
FIGURE 5 CIRCUIT
toc07
3.45
toc08
VIN = 4.5V
VIN = 12V
VIN = 36V
VIN = 60V
OUTPUT VOLTAGE (V)
OUTPUT VOLTAGE (V)
3.32
3.31
3.30
VIN = 4.5V
VIN = 24V
VIN = 48V
VIN = 24V
VIN = 36V
VIN = 48V
3.35
VIN = 60V
3.30
3.29
3.28
VIN = 12V
3.40
0.00
0.05
0.10
LOAD CURRENT (A)
CONDITIONS: PWM MODE, fSW = 200kHz
www.maximintegrated.com
0.15
3.25
0.00
0.05
0.10
LOAD CURRENT (A)
CONDITIONS: PFM MODE, fSW = 200kHz
0.15
Maxim Integrated │ 6
MAX17670, MAX17671,
MAX17672
Integrated 4V-60V, 150mA, High-Efficiency,
Synchronous Step-Down DC-DC Converter
with 50mA Linear Regulator
Typical Operating Characteristics (continued)
(VIN = 24V, VGND = 0V, TA = -40°C to +125°C, unless otherwise noted. Typical values are at TA = +25°C. All voltages are referenced
to GND, unless otherwise noted.)
100
90
80
80
70
VIN = 36V
60
VIN = 48V
VIN = 24V
50
VIN = 60V
VIN = 12V
40
VIN = 6.5V
30
0.05
0.10
LOAD CURRENT (A)
CONDITIONS: PWM MODE, fSW = 600kHz
MAX17671F, 5V OUTPUT
LOAD AND LINE REGULATION
FIGURE 6 CIRCUIT
toc12
EFFICIENCY (%)
VIN = 48V
5.05
VIN = 60V
4.95
0.00
0.05
0.10
LOAD CURRENT (A)
CONDITIONS: PFM MODE, fSW = 600kHz
3.31
80
70
VIN = 36V
60
VIN = 24V
50
VIN = 12V
40
OUTPUT VOLTAGE (V)
3.28
VIN = 24V
0.05
0.10
LOAD CURRENT (A)
CONDITIONS: PWM MODE, fSW = 600kHz
VIN = 4.5V
40
10
0
0.001
0.05
0.10
0.15
LOAD CURRENT (A)
CONDITIONS: PWM MODE, fSW = 600kHz
VIN = 24V
VIN = 12V
VIN = 4.5V
0.010
0.100
LOAD CURRENT (A)
CONDITIONS: PFM MODE, fSW = 600kHz
MAX17670E, 3.3V OUTPUT
LOAD AND LINE REGULATION
FIGURE 7 CIRCUIT
toc15
toc14
VIN = 42V
30
0.00
0.15
VIN = 36V
50
20
toc16
3.45
VIN = 4.5V
3.40
VIN = 12V
VIN = 24V
VIN = 36V
3.35
VIN = 42V
3.30
3.27
3.26
0.00
60
10
VIN = 42V
VIN = 48V
70
20
3.29
VIN = 4.5V
VIN = 42V
VIN = 36V
VIN = 12V
3.30
VIN = 24V
100
90
0
MAX17670E, 3.3V OUTPUT
LOAD AND LINE REGULATION
FIGURE 7 CIRCUIT
toc13
80
0.15
VIN = 6.5V
MAX17670E, 3.3V OUTPUT
EFFICIENCY vs. LOAD CURRENT
FIGURE 7 CIRCUIT
90
30
5.00
VIN = 60V
5.02
5.01
OUTPUT VOLTAGE (V)
OUTPUT VOLTAGE (V)
VIN = 36V
VIN = 36V
5.03
0.010
0.100
LOAD CURRENT (A)
CONDITIONS: PFM MODE, fSW = 600kHz
100
VIN = 24V
VIN = 12V
VIN = 6.5V
MAX17670E, 3.3V OUTPUT
EFFICIENCY vs. LOAD CURRENT
FIGURE 7 CIRCUIT
VIN = 6.5V
VIN = 12V
VIN = 12V
0
0.001
0.15
VIN = 60V
VIN = 24V
30
10
5.10
VIN = 36V
40
20
5.15
VIN = 48V
50
toc11
5.05
5.04
60
10
0.00
toc10
70
20
0
MAX17671F, 5V OUTPUT
LOAD AND LINE REGULATION
FIGURE 6 CIRCUIT
OUTPUT VOLTAGE (V)
toc09
90
EFFICIENCY (%)
EFFICIENCY (%)
100
MAX17671F, 5V OUTPUT
EFFICIENCY vs. LOAD CURRENT
FIGURE 6 CIRCUIT
EFFICIENCY (%)
MAX17671F, 5V OUTPUT
EFFICIENCY vs. LOAD CURRENT
FIGURE 6 CIRCUIT
0.00
0.05
0.10
LOAD CURRENT (A)
CONDITIONS: PWM MODE, fSW = 600kHz
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0.15
3.25
0.00
0.05
0.10
LOAD CURRENT (A)
CONDITIONS: PFM MODE, fSW = 600kHz
0.15
Maxim Integrated │ 7
MAX17670, MAX17671,
MAX17672
Integrated 4V-60V, 150mA, High-Efficiency,
Synchronous Step-Down DC-DC Converter
with 50mA Linear Regulator
Typical Operating Characteristics (continued)
(VIN = 24V, VGND = 0V, TA = -40°C to +125°C, unless otherwise noted. Typical values are at TA = +25°C. All voltages are referenced
to GND, unless otherwise noted.)
toc17
100
90
90
80
80
70
70
EFFICIENCY (%)
EFFICIENCY (%)
100
MAX17672C, 5V OUTPUT
EFFICIENCY vs. LOAD CURRENT
FIGURE 8 CIRCUIT
VIN = 36V
60
VIN = 48V
VIN = 24V
50
VIN = 60V
VIN = 12V
40
VIN = 6.5V
30
0.00
0.05
0.10
LOAD CURRENT (A)
CONDITIONS: PWM MODE, fSW = 600kHz
MAX17672C, 5V OUTPUT
LOAD AND LINE REGULATION
FIGURE 8 CIRCUIT
5.15
VIN = 12V
5.02
4.99
0.010
0.100
LOAD CURRENT (A)
CONDITIONS: PFM MODE, fSW = 600kHz
0.00
toc21
250
VIN = 12V
VIN = 36V
VIN = 60V
VIN = 6.5V
VIN = 24V
VIN = 48V
0.05
0.10
LOAD CURRENT (A)
CONDITIONS: PWM MODE, fSW = 600kHz
0.15
MAX17671F, 5V OUTPUT
SHUTDOWN CURRENT vs.
INPUT VOLTAGE, FIGURE 6 CIRCUIT
MAX17671F, 5V OUTPUT
NO-LOAD SUPPLY CURRENT vs.
INPUT VOLTAGE, FIGURE 6 CIRCUIT
toc20
toc19
5.01
5.00
VIN = 6.5V
0
0.001
0.15
VIN = 60V
VIN = 24V
30
10
0
VIN = 36V
40
10
5.04
VIN = 48V
50
20
toc18
5.03
60
20
MAX17672C, 5V OUTPUT
LOAD AND LINE REGULATION
FIGURE 8 CIRCUIT
OUTPUT VOLTAGE (V)
MAX17672C, 5V OUTPUT
EFFICIENCY vs. LOAD CURRENT
FIGURE 8 CIRCUIT
toc22
8
VIN = 6.5V
VIN = 36V
SUPPLY CURRENT (µA)
OUTPUT VOLTAGE (V)
200
VIN = 24V
VIN = 48V
5.05
VIN = 60V
5.00
4.95
6
CURRENT (µA)
VIN = 12V
5.10
150
100
2
50
0.00
0.05
0.10
LOAD CURRENT (A)
CONDITIONS: PFM MODE, fSW = 600kHz
0
0.15
0
20
30
40
50
INPUT VOLTAGE (V)
CONDITIONS: PFM MODE, fSW = 600kHz
MAX17671F, 5V OUTPUT
LOAD TRANSIENT BETWEEN 0mA AND 50mA
FIGURE 4 CIRCUIT
toc23
VOUT(AC)
50mA/div
100µs/div
CONDITIONS: PWM MODE, fSW = 200kHz
www.maximintegrated.com
10
60
0
0
10
20
30
40
50
INPUT VOLTAGE (V)
CONDITIONS: PFM MODE, fSW = 600kHz
60
MAX17671F, 5V OUTPUT
LOAD TRANSIENT BETWEEN 100mA AND 150mA
FIGURE 4 CIRCUIT
toc24
100mV/div
IOUT
4
VOUT(AC)
100mV/div
IOUT
50mA/div
100µs/div
CONDITIONS: PWM MODE, fSW = 200kHz
Maxim Integrated │ 8
MAX17670, MAX17671,
MAX17672
Integrated 4V-60V, 150mA, High-Efficiency,
Synchronous Step-Down DC-DC Converter
with 50mA Linear Regulator
Typical Operating Characteristics (continued)
(VIN = 24V, VGND = 0V, TA = -40°C to +125°C, unless otherwise noted. Typical values are at TA = +25°C. All voltages are referenced
to GND, unless otherwise noted.)
MAX17671F, 5V OUTPUT
LOAD TRANSIENT BETWEEN 1mA AND 50mA
FIGURE 4 CIRCUIT
MAX17670E, 3.3V OUTPUT
LOAD TRANSIENT BETWEEN 0mA AND 50mA
FIGURE 5 CIRCUIT
toc26
toc25
VOUT(AC)
100mV/div
IOUT
MAX17670E, 3.3V OUTPUT
LOAD TRANSIENT BETWEEN 100mA AND 150mA
FIGURE 5 CIRCUIT
toc27
VOUT(AC)
100mV/div
VOUT(AC)
100mV/div
IOUT
50mA/div
IOUT
50mA/div
50mA/div
400µs/div
CONDITIONS: PFM MODE, fSW = 200kHz
100µs/div
CONDITIONS: PWM MODE, fSW = 200kHz
100µs/div
CONDITIONS: PWM MODE, fSW = 200kHz
MAX17670E, 3.3V OUTPUT
LOAD TRANSIENT BETWEEN 1mA AND 50mA
FIGURE 5 CIRCUIT
MAX17671F, 5V OUTPUT
LOAD TRANSIENT BETWEEN 0mA AND 50mA
FIGURE 6 CIRCUIT
MAX17671F, 5V OUTPUT
LOAD TRANSIENT BETWEEN 100mA AND 150mA
FIGURE 6 CIRCUIT
VOUT(AC)
100mV/div
IOUT
toc30
toc29
toc28
VOUT(AC)
50mA/div
100mV/div
IOUT
50mA/div
100µs/div
CONDITIONS: PWM MODE, fSW = 600kHz
200µs/div
CONDITIONS: PFM MODE, fSW = 200kHz
MAX17671F, 5V OUTPUT
LOAD TRANSIENT BETWEEN 1mA AND 50mA
FIGURE 6 CIRCUIT
VOUT(AC)
100mV/div
IOUT
50mA/div
100µs/div
CONDITIONS: PWM MODE, fSW = 600kHz
MAX17670E, 3.3V OUTPUT
LOAD TRANSIENT BETWEEN 0mA AND 50mA
FIGURE 7 CIRCUIT
toc32
toc31
VOUT(AC)
100mV/div
IOUT
VOUT(AC)
100mV/div
IOUT
50mA/div
50mA/div
100µs/div
CONDITIONS: PFM MODE, fSW = 600kHz
www.maximintegrated.com
100µs/div
CONDITIONS: PWM MODE, fSW = 600kHz
Maxim Integrated │ 9
MAX17670, MAX17671,
MAX17672
Integrated 4V-60V, 150mA, High-Efficiency,
Synchronous Step-Down DC-DC Converter
with 50mA Linear Regulator
Typical Operating Characteristics (continued)
(VIN = 24V, VGND = 0V, TA = -40°C to +125°C, unless otherwise noted. Typical values are at TA = +25°C. All voltages are referenced
to GND, unless otherwise noted.)
MAX17670E, 3.3V OUTPUT
LOAD TRANSIENT BETWEEN 1mA AND 50mA
FIGURE 7 CIRCUIT
MAX17670E, 3.3V OUTPUT
LOAD TRANSIENT BETWEEN 100mA AND 150mA
FIGURE 7 CIRCUIT
toc33
MAX17672C, 5V OUTPUT
LOAD TRANSIENT BETWEEN 0mA AND 50mA
FIGURE 8 CIRCUIT
toc35
toc34
VOUT(AC)
100mV/div
IOUT
50mA/div
VOUT(AC)
100mV/div
IOUT
VOUT(AC)
100mV/div
50mA/div
IOUT
100µs/div
CONDITIONS: PWM MODE, fSW = 600kHz
100µs/div
CONDITIONS: PWM MODE, fSW = 600kHz
100µs/div
CONDITIONS: PFM MODE, fSW = 600kHz
MAX17672C, 5V OUTPUT
LOAD TRANSIENT BETWEEN 100mA AND 150mA
FIGURE 8 CIRCUIT
50mA/div
MAX17672C, 5V OUTPUT
LOAD TRANSIENT BETWEEN 1mA AND 50mA
FIGURE 8 CIRCUIT
toc36
toc37
VOUT(AC)
100mV/div
IOUT
50mA/div
VOUT(AC)
100mV/div
IOUT
50mA/div
100µs/div
CONDITIONS: PWM MODE, fSW = 600kHz
100µs/div
CONDITIONS: PFM MODE, fSW = 600kHz
MAX17671F, 5V OUTPUT
STEADY STATE AT 150mA LOAD
FIGURE 6 CIRCUIT
MAX17671F, 5V OUTPUT
STEADY STATE AT 0mA LOAD
FIGURE 6 CIRCUIT
toc39
toc38
VOUT(AC)
20mV/div
VLX
10V/div
VOUT(AC)
20mV/div
VLX
10V/div
ILX
ILX
100mA/div
100mA/div
1µs/div
CONDITIONS: PWM MODE, fSW = 600kHz
www.maximintegrated.com
1µs/div
CONDITIONS: PWM MODE, fSW = 600kHz
Maxim Integrated │ 10
MAX17670, MAX17671,
MAX17672
Integrated 4V-60V, 150mA, High-Efficiency,
Synchronous Step-Down DC-DC Converter
with 50mA Linear Regulator
Typical Operating Characteristics (continued)
(VIN = 24V, VGND = 0V, TA = -40°C to +125°C, unless otherwise noted. Typical values are at TA = +25°C. All voltages are referenced
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
toc41
toc40
VOUT(AC)
MAX17671F, 5V OUTPUT
SHUTDOWN THROUGH EN/UVLO
FIGURE 6 CIRCUIT
toc42
100mV/div
VLX
VEN/UVLO
5V/div
VEN/UVLO
5V/div
VOUT
2V/div
VOUT
2V/div
10V/div
ILX
ILX
VRESET
100mA/div
10µs/div
CONDITIONS: PFM MODE, fSW = 600kHz
100mA/div
VRESET
5V/div
1ms/div
CONDITIONS: PWM MODE, fSW = 600kHz, 33Ω RESISTIVE LOAD,
RESET IS PULLED UP TO VOUT WITH A 10kΩ RESISTOR
ILX
100µs/div
CONDITIONS: PWM MODE, fSW = 600kHz, 33Ω RESISTIVE LOAD,
RESET IS PULLED UP TO VOUT WITH A 10kΩ RESISTOR
toc44
toc43
VOUT
5V/div
MAX17670E, 3.3V OUTPUT
SOFT-START THROUGH EN/UVLO
FIGURE 7 CIRCUIT
MAX17671F, 5V OUTPUT
SOFT-START WITH PREBIAS VOLTAGE OF 2.5V
FIGURE 6 CIRCUIT
VEN/UVLO
100mA/div
ILX
5V/div
VEN/UVLO
5V/div
2V/div
VOUT
2V/div
100mA/div
ILX
VRESET
5V/div
1ms/div
CONDITIONS: PWM MODE, fSW = 600kHz, 1kΩ RESISTIVE LOAD,
RESET IS PULLED UP TO VOUT WITH A 10kΩ RESISTOR
100mA/div
VRESET
5V/div
1ms/div
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
MAX17672C, 5V OUTPUT
SOFT-START THROUGH EN/UVLO
FIGURE 8 CIRCUIT
toc45
toc46
VEN/UVLO
5V/div
VSYNC
VOUT
2V/div
VOUT
ILX
VRESET
100mA/div
5V/div
50mV/div
VLX
20V/div
5V/div
ILX
1ms/div
CONDITIONS: PWM MODE, fSW = 600kHz, 33Ω RESISTIVE LOAD,
RESET IS PULLED UP TO VOUT WITH A 10kΩ RESISTOR
www.maximintegrated.com
200mA/div
10µs/div
CONDITIONS: fSW = 600kHz, 150mA LOAD
Maxim Integrated │ 11
MAX17670, MAX17671,
MAX17672
Integrated 4V-60V, 150mA, High-Efficiency,
Synchronous Step-Down DC-DC Converter
with 50mA Linear Regulator
Typical Operating Characteristics (continued)
(VIN = 24V, VGND = 0V, TA = -40°C to +125°C, unless otherwise noted. Typical values are at TA = +25°C. All voltages are referenced
to GND, unless otherwise noted.)
40
toc48
100
MAX17670E, 3.3V OUTPUT
CLOSED LOOP BODE PLOT
FIGURE 5 CIRCUIT
40
PHASE
50
0
GAIN
-20
ILX
-40
toc50
MAX17670E, 3.3V OUTPUT
CLOSED LOOP BODE PLOT
FIGURE 7 CIRCUIT
40
100
-40
0.16
3.0
OUTPUT VOLTAGE (V)
3.3
0.08
1k
toc54
3.6
0.20
0.12
GAIN CROSSOVER
FREQUENCY = 29.5kHz
PHASE MARGIN = 61.7°
MAX17671F, 3.3V LINEAR REGULATOR
OUTPUT VOLTAGE vs. INPUT VOLTAGE
toc53
100
LOAD = 1mA
80
60
GAIN
20
10k
100k
FREQUENCY (Hz)
CONDITIONS: PWM MODE, fSW = 600kHz, 150mA LOAD
-40
toc52
0
-20
MAX17671F, 3.3V LINEAR REGULATOR
DROPOUT VOLTAGE vs. LOAD CURRENT
DROPOUT VOLTAGE (V)
MAX17672C, 5V OUTPUT
CLOSED LOOP BODE PLOT
FIGURE 8 CIRCUIT
20
40
20
10k
100k
FREQUENCY (Hz)
CONDITIONS: PWM MODE, fSW = 600kHz, 150mA LOAD
1k
60
GAIN
-20
40
GAIN CROSSOVER
FREQUENCY = 23.8kHz
PHASE MARGIN = 59.4°
20
10k
100k
FREQUENCY (Hz)
CONDITIONS: PWM MODE, fSW = 600kHz, 150mA LOAD
1k
MAX17671F, 3.3V LINEAR REGULATOR
LOAD TRANSIENT BETWEEN 1mA AND 25mA
FIGURE 6 CIRCUIT
toc55
VOUTL(AC)
50mV/div
IOUTL
20mA/div
LOAD = 5mA
LOAD = 10mA
2.7
LOAD = 25mA
2.4
LOAD = 50mA
2.1
0.04
0.00
1k
40
100
80
0
40
GAIN CROSSOVER
FREQUENCY = 23.4kHz
PHASE MARGIN = 61.5°
0.24
-100
10k
100k
FREQUENCY (Hz)
CONDITIONS: PWM MODE, fSW = 200kHz, 150mA LOAD
GAIN (dB)
60
GAIN
GAIN (dB)
0
-50
GAIN CROSSOVER
FREQUENCY = 18.2kHz
PHASE MARGIN = 62.9°
PHASE
20
80
PHASE (°)
GAIN (dB)
20
-40
0
GAIN
PHASE
PHASE
-20
toc51
0
-40
1k
PHASE (°)
MAX17671F, 5V OUTPUT
CLOSED LOOP BODE PLOT
FIGURE 6 CIRCUIT
50
-20
-100
10k
100k
FREQUENCY (Hz)
CONDITIONS: PWM MODE, fSW = 200kHz, 150mA LOAD
10ms/div
CONDITIONS: fSW = 600kHz
40
-50
GAIN CROSSOVER
FREQUENCY = 12.2kHz
PHASE MARGIN = 59.7°
200mA/div
GAIN (dB)
0
20
PHASE (°)
GAIN (dB)
1V/div
100
PHASE
20
VOUT
toc49
PHASE (°)
toc47
MAX17671F, 5V OUTPUT
CLOSED LOOP BODE PLOT
FIGURE 4 CIRCUIT
PHASE (°)
MAX17671F, 5V OUTPUT
OVERLOAD PROTECTION
FIGURE 6 CIRCUIT
1.8
0
10
20
30
LOAD CURRENT (mA)
40
50
CONDITIONS: INL CONNECTED TO EXTERNAL SUPPLY
www.maximintegrated.com
2.35
2.88
3.41
3.94
4.47
5.00
INPUT VOLTAGE (V)
CONDITIONS: INL CONNECTED TO EXTERNAL SUPPLY
40µs/div
CONDITIONS: INL CONNECTED TO VOUT, PWM MODE
Maxim Integrated │ 12
MAX17670, MAX17671,
MAX17672
Integrated 4V-60V, 150mA, High-Efficiency,
Synchronous Step-Down DC-DC Converter
with 50mA Linear Regulator
Typical Operating Characteristics (continued)
(VIN = 24V, VGND = 0V, TA = -40°C to +125°C, unless otherwise noted. Typical values are at TA = +25°C. All voltages are referenced
to GND, unless otherwise noted.)
MAX17671F, 3.3V LINEAR REGULATOR
LOAD TRANSIENT BETWEEN 25mA AND 50mA
FIGURE 6 CIRCUIT
MAX17671F, 3.3V LINEAR REGULATOR
START-UP FROM EN/UVLO
FIGURE 6 CIRCUIT
toc56
MAX17671F, 3.3V OUTPUT LINEAR REGULATOR,
POWER SUPPLY REJECTION RATIO vs. FREQUENCY
toc58
70
toc57
60
20mV/div
IOUTL
VEN/UVLO
VINL = VOUTL
2V/div
VOUTL
2V/div
IOUTL
20mA/div
50
5V/div
PSRR (dB)
VOUTL(AC)
30
20
VINL = 4.3V
10
50mA/div
0
1ms/div
CONDITIONS: fSW = 600kHz, 66Ω RESISTIVE LOAD,
INL CONNECTED TO VOUT
100
1k
10k
100k
1Meg
FREQUENCY (Hz)
CONDITIONS: LOAD = 50mA, INL CONNECTED TO
EXTERNAL SUPPLY
MAX17671F, STEP-DOWN CONVERTER LOAD TRANSIENT
ON 3.3V LINEAR REGULATOR OUTPUT,
FIGURE 4 CIRCUIT
MAX17671F, 3.3V LINEAR REGULATOR
OUTPUT VOLTAGE ACCURACY vs. TEMPERATURE,
FIGURE 4 CIRCUIT
20µs/div
CONDITIONS: INL CONNECTED TO VOUT, PWM MODE
VOUTL(AC)
toc60
VOUTL(AC)
20mV/div
VOUT(AC)
VOUT(AC)
200mV/div
IOUT
IOUT
100mA/div
400µs/div
CONDITIONS: fSW = 200kHz, PFM MODE, IOUTL = 1mA,
STEP-DOWN CONVERTER LOAD STEP BETWEEN 0mA AND 100mA
60
50
PEAK EMISSIONS
20
AVERAGE EMISSIONS
10
0.15
www.maximintegrated.com
1
10
FREQUENCY (MHz)
MEASURED ON MAX17672CEVKIT# with
L2 = 8.2µH, C10 = 1µF/100V/X7R/1206
LOAD = 50mA
3.26
LOAD = 10mA
3.24
20
50
80
110
TEMPERATURE (ºC)
CONDITIONS: PWM MODE, INL CONNECTED TO VOUT
-40
-10
toc63
40
30
20
CISPR22 CLASS B QP LIMIT
VERTICAL SCAN
10
0
30
3.28
70
CISPR22 CLASS B QP LIMIT
30
LOAD = 100µA
3.30
RADIATED EMISSIONS PLOT
5V OUTPUT, 150mA LOAD CURRENT
CISPR22 CLASS B AVG LIMIT
40
LOAD = 1mA
100mA/div
MAGNITUDE(dBµV/m)
MAGNITUDE (dBµV)
50
0
200mV/div
toc62
60
3.32
20mV/div
400µs/div
CONDITIONS: fSW = 200kHz, PWM MODE, IOUTL = 50mA,
STEP-DOWN CONVERTER LOAD STEP BETWEEN 0mA AND 100mA
70
toc61
3.34
OUTPUT VOLTAGE (V)
MAX17671F, STEP-DOWN CONVERTER LOAD TRANSIENT
ON 3.3V LINEAR REGULATOR OUTPUT,
FIGURE 4 CIRCUIT
toc59
VINL = 5V
40
-10
30
HORIZONTAL SCAN
100
FREQUENCY (MHz)
MEASURED ON MAX17672CEVKIT#
with L2 = SHORT, C10 = OPEN
1000
Maxim Integrated │ 13
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
EN/UVLO
2
RT
3
FBBUCK
4
OUTL
5
10 LX
9 GND
MAX17670
MAX17671
MAX17672
8 MODE/SYNC
7
EP
RESET
6 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.
2
EN/
UVLO
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-Lockout Level section for more details.
3
RT
Programmable Switching Frequency Input. Connect a resistor from RT to GND to program the switching frequency from 200kHz to 2.2MHz. Leave the RT pin unconnected for a default 600kHz switching frequency. See
the Switching Frequency (RT) section for details.
4
5
Step-down Converter Feedback Input. For MAX17670 and MAX17671, connect FBBUCK directly to the output
FBBUCK node of the step-down converter. For the MAX17672, connect FBBUCK to a resistor-divider between the regulated buck-voltage node and GND. See the Adjusting the Output Voltage section for details.
OUTL
Linear Regulator Output Pin. Connect at least 2.2μF, 0603 capacitor across OUTL and GND.
INL
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.
7
RESET
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
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 VINL_UVLO. Else, RESET considers only FBBUCK voltage for
its high impedance state.
8
MODE/
SYNC
Mode Selection and External Clock Synchronization Input. Connect the MODE/SYNC pin to the GND pin to enable the fixed-frequency PWM operation. Leave MODE/SYNC unconnected for PFM operation. An external clock
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.
9
GND
6
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.
www.maximintegrated.com
Maxim Integrated │ 14
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
10
LX
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.
―
EP
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.
Functional Diagrams
MAX17670/MAX17671/MAX17672
INTERNAL
LINEAR REGULATOR
INL
IN
BIAS SELECT
POK
EN/UVLO
VCC
CHIPEN
PEAK LIMIT
VENR
CURRENT
SENSE
LOGIC
THERMAL
SHUTDOWN
CLK
RT
OSCILLATOR
RMODE
SLOPE
CURRENT
SENSE
AMPLIFIER
CS
PFM
PWM/PFM
CONTROL
LOGIC
DH
HIGH-SIDE
DRIVER
LX
VCC
MODE/SYNC
MODE SELECTION
LOGIC
*S1
DL
LOW-SIDE
DRIVER
R1
FBBUCK
*S2
R2
GND
*S3
ERROR
AMPLIFIER
SINK-LIMIT
LOOP
COMPENSATION
SLOPE
CS
INTERNAL
SOFTSTART
CONTROL
INL
VFBBUCKR
LDO UVLO
LOGIC
FET DRIVER WITH
CURRENT LIMIT
VOUTLR
* 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
www.maximintegrated.com
SINK CURRENT
LIMIT
CHIPEN
RESET
FBBUCK
OUTL
LDO INTERNAL
SOFT-START
CONTROL
CURRENT
SENSE
AMPLIFIER
R3
R4
RESET
LOGIC
OUTL
VINL-UVLO
INL
Maxim Integrated │ 15
MAX17670, MAX17671,
MAX17672
Integrated 4V-60V, 150mA, High-Efficiency,
Synchronous Step-Down DC-DC Converter
with 50mA Linear Regulator
Detailed Description
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. MAX17670
and MAX17671 are the fixed 3.3V and 5V step-down converter output voltage devices, respectively. MAX17672 is
the adjustable step-down converter output voltage (0.8V
to 90%VIN) device. All three devices feature internal
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 outputs; and, ±2% for the step-down converter.
The step-down converter uses an internally compensated, 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 voltage 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 voltage 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 current to the output.
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.
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
www.maximintegrated.com
a falling edge is detected, the change from PFM to PWM
mode is instantaneous.
PWM operation is useful in frequency-sensitive applications 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
peak (IPFM) of 92mA (typ) every clock cycle until the
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 discharges 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 device naturally exits PFM mode when the load current demands inductor peak current above IPFM (92mA
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 synchronized to an external clock signal on the MODE/SYNC
pin. The external synchronization clock frequency must
be between 1.1 x fSW and 1.4 x fSW, where fSW is the
switching frequency programmed by the resistor connected 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
be reset with a VIN power cycle or EN/UVLO cycle. The
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
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)
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 linear regulator operates from 2.35V to 5.5V inputvoltage range and the linear regulator is enabled when
VINL is more than VINL_UVLO.
The INL pin also functions as bootstrap input to power up
the internal blocks. Switchover to bootstrap input occurs
when VINL is above VINL_TH. This improves the overall
efficiency, since the internal blocks are being powered
from the step-down converter output which has the voltage less than the input voltage.
Enable/Undervoltage-Lockout Input
(EN/UVLO) and Soft-Start
When EN/UVLO voltage increases above VENR (1.215V
typ), the device initiates a built-in 5.1ms (typ) soft-start
period after an internal delay of 400μs (t1), allowing a
monotonic increase of the output voltage to the final set
value.
EN/UVLO can be used as an input-voltage UVLO adjustment 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.
VENR
EN/UVLO
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 switches are turned off so that the converter does not sink current 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
value in alignment with the internal reference. Such a
feature is useful in applications where digital integrated
circuits with multiple rails are powered.
RESET Output
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.
RESET goes to high impedance 2.1ms after both stepdown converter and linear regulator outputs rise above
95% of their nominal set value, if VINL is above VINL_UVLO.
Otherwise, RESET only considers step-down converter
output voltage for its high impedance state.
RESET pulls low after 4μs (t2) if one of the either output
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.
VENF
t1
VFBBUCKR
VINL=VOUT
Startup Into a Prebiased Step-Down Converter Output
VFBBUCKF
*a
tSS1
VOUTLF VOUTLR
VOUTL
tSS2
RESET
tD
t2
tD
t2
*a : VOUTL IS POWERED UP AFTER VINL HAS REACHED VINL-UVLO
Figure 1. RESET Output Logic Diagram
www.maximintegrated.com
Maxim Integrated │ 17
MAX17670, MAX17671,
MAX17672
Integrated 4V-60V, 150mA, High-Efficiency,
Synchronous Step-Down DC-DC Converter
with 50mA Linear Regulator
Switching Frequency (RT)
Switching frequency of the device can be programmed
from 200kHz to 2.2MHz by using a resistor connected
from RT to GND. The switching frequency (fSW) is related
to the resistor (RRT) connected at the RT pin by the following equation:
R RT ≈
500
11.6
− 0.5
−
t
0.045
SW
1
t SW =
f SW
Where RRT is in kΩ and tSW is in μs. Leave the RT pin
unconnected for the default 600kHz switching frequency.
The value of RRT 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 switching frequency for PFM mode of operation is 900kHz.
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 operating input voltages for a given output voltage should be
calculated as follows:
VIN(MIN) =
VOUT + ( I OUT(MAX) × (R DCR(MAX) + R DS-ONL(MAX) ))
1 – t OFF_MIN(MAX) × f SW(MAX)
+ (I OUT(MAX) × (R DS- ONH(MAX) – R DS – ONL(MAX) ))
VIN(MAX) =
VOUT
f SW(MAX) × t ON_MIN( MAX )
where:
VOUT = Steady-state output voltage,
www.maximintegrated.com
IOUT(MAX) = Maximum load current,
RDCR(MAX) = Maximum DC resistance of the inductor,
fSW(MAX) = Maximum switching frequency,
tOFF_MIN(MAX) = Worst case minimum switch off-time (75ns),
tON_MIN(MAX) = Worst-case minimum switch on-time (128ns),
RDS-ONL(MAX) and RDS-ONH(MAX) = Maximum on-state
resistances of the low-side and high-side MOSFETs,
respectively.
Overcurrent Protection
The device implements a hysteretic peak current-limit
protection scheme to protect the internal FETs and inductor under output short-circuit conditions. When the inductor peak current exceeds IPEAK-LIMIT (0.295A typ), the
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
enters hiccup mode if the inductor current hits IPEAKLIMIT for 16 consecutive times. After the hiccup time-out
period, the device auto retries to startup and the same
operation continues until the short is removed and the
inductor peak current goes below IPEAK-LIMIT. Since the
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 ISINK-LIMIT (105mA typ) with a ripple of
50mA.
Thermal-Shutdown Protection
Thermal-shutdown protection limits the junction temperature in the IC. This feature is present in PWM mode.
When the junction temperature exceeds +160°C, an onchip thermal sensor shuts down the device, turns off the
internal power MOSFETs and the linear regulator, allowing the device to cool down. The device turns on with
soft-start after the junction temperature reduced by 20°C.
Maxim Integrated │ 18
MAX17670, MAX17671,
MAX17672
Integrated 4V-60V, 150mA, High-Efficiency,
Synchronous Step-Down DC-DC Converter
with 50mA Linear Regulator
Applications Information
D = VOUT/VIN is the duty ratio of the controller,
fSW = Switching frequency,
Inductor Selection
Three key inductor parameters must be specified for
operation with the device: inductance value (L), inductor
saturation current (ISAT), and DC resistance (RDCR). The
switching frequency and output voltage determine the
inductor value as follows:
L=
8150 × VOUT
f SW
VOUT = Output voltage
fSW = Switching frequency in kHz
Select a low-loss inductor closest to the calculated value
with acceptable dimensions and having the lowest possible DC resistance. The saturation current rating (ISAT) of
the inductor must be high enough to ensure that saturation
can occur only above the peak current-limit (IPEAK-LIMIT).
Input Capacitor Selection
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 (IRMS) is
defined by the following equation:
VOUT × (VIN – VOUT )
VIN
where, IOUT(MAX) is the maximum load current. IRMS has
a maximum value when the input voltage equals twice
the output voltage (VIN = 2 x VOUT), so IRMS(MAX) =
IOUT(MAX)/1.414. Choose an input capacitor that exhibits
less than +10°C temperature rise at the RMS input current for optimal long-term reliability. Use low-ESR ceramic
capacitors with high ripple-current capability at the input.
X7R capacitors are recommended in industrial applications for their temperature stability. Calculate the input
capacitance using the following equation:
C IN =
η = Efficiency
In applications where the source is located distant from 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.
Output Capacitor Selection for Step-Down
Converter
where:
L = Inductance in μH,
IRMS = I OUT(MAX) ×
∆VIN = Allowable input voltage ripple,
I OUT(MAX) × D × (1– D)
η × f SW × ∆VIN
X7R ceramic output capacitors are recommended for the
device due to their stability over the temperature in industrial 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 support 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.
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 capacitance meets the minimum required output capacitance.
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 variations over temperature. Ensure that the minimum capacitance under worst-case conditions does not drop below
1μF for linear regulator output stability.
Table 1. Output Capacitor Selection
FREQUENCY RANGE
(KHZ)
MINIMUM OUTPUT
CAPACITANCE (μF)
200 to 215
20
VOUT
308 to 2200
13
VOUT
where:
www.maximintegrated.com
Maxim Integrated │ 19
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
The device offers an adjustable input undervoltage-lockout 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:
R2 =
R1× 1.215
(VINU – 1.215)
where VINU is the voltage greater than 4V above which
the device is required to turn on.
Adjusting the Output Voltage
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
0.9 x VIN. Set the output voltage by connecting a resistor
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:
V
R1= R2 × OUT – 1
0.8
Linear Regulator Output Voltage Options
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:
PLOSS = PBUCK + PLDO
1
PBUCK = VOUT × I OUT × – 1 – I OUT 2 × R DCR
η
=
PLDO (VINL – VOUTL ) × I OUTL
(
)
where:
VOUT = Step-down converter output voltage,
IOUT = Step-down converter load current,
η = Efficiency of step-down converter power conversion,
VINL = LDO-input voltage,
VOUTL = LDO-output voltage,
IOUTL = LDO load current
VIN
IN
R1
RDCR = DC resistance of the output inductor.
MAX17670
MAX17671
MAX17672
EN/UVLO
R2
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:
θJA = 41°C/W
θJC = 9°C/W
GND
The junction temperature (TJ) of the device can be estimated at any ambient temperature (TA) from the following
equation:
Figure 2. Adjustable EN/UVLO Network
VOUT
MAX17672
R1
FBBUCK
R2
GND
Figure 3. Setting the Output Voltage
www.maximintegrated.com
TJ = TA + (θJC x PLOSS)
If the application has a thermal-management system that
ensures that the exposed pad of the device is maintained
at a given temperature (TEP(MAX)) by using proper heat
sinks, then the junction temperature of the device can be
estimated at any given maximum ambient temperature as
TJ(MAX) = TEP(MAX) + (θJC x PLOSS)
Note: Junction Temperature greater than +125°C degrades
operating lifetimes
Maxim Integrated │ 20
MAX17670, MAX17671,
MAX17672
Integrated 4V-60V, 150mA, High-Efficiency,
Synchronous Step-Down DC-DC Converter
with 50mA Linear Regulator
PCB Layout Guidelines
●● Route the high-speed switching node (LX) away from
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
connection to reduce the radiated EMI
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.
●● Ensure that all feedback connections are short and
direct
Typical Application Circuits
MAX17671 High-Efficiency 5V Output
VIN
6.5V TO 60V
C1
1µF
R1
3.32MΩ
R2
787kΩ
VOUTL
3.3V, 50mA
C2
2.2µF
IN
LX
EN/UVLO
C3
10µF
VOUT
5V, 100mA
GND
MAX17671F
OUTL
FBBUCK
MODE/SYNC
R1
274kΩ
L1
220µH
RT
EP
MODE/SYNC:
CONNECT TO GND FOR PWM MODE
UNCONNECTED FOR PFM MODE
RESET
INL
L1 : LPS6235-224MR
C1 : 1.0µF/X7R/100V/1206
C2 : 2.2µF/X7R/10V/0603 (GRM188R71A225KE15)
C3 : 10µF/X7R/25V/0805 (GRM21BZ71E106KE15)
fSW : 200kHz
Figure 4. Fixed 5V Step-Down Converter Output at 200kHz Switching Frequency and 3.3V Linear Regulator Output
www.maximintegrated.com
Maxim Integrated │ 21
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
VIN
4.5V TO 60V
C1
1µF
R1
3.32MΩ
R2
1.27MΩ
VOUTL
3V, 20mA
IN
LX
EN/UVLO
MAX17670E
OUTL
C2
2.2µF
C3
10µF
VOUT
3.3V, 130mA
GND
FBBUCK
MODE/SYNC
R1
274kΩ
L1
150µH
RT
RESET
INL
EP
MODE/SYNC:
CONNECT TO GND FOR PWM MODE
UNCONNECTED FOR PFM MODE
L1 : LPS6235-154MR
C1 : 1.0µF/X7R/100V/1206
C2 : 2.2µF/X7R/10V/0603 (GRM188R71A225KE15)
C3 : 10µF/X7R/10V/0805 (GRM21BR71A106KA73)
fSW : 200kHz
Figure 5. Fixed 3.3V Step-Down Converter Output at 200kHz Switching Frequency and 3.0V Linear Regulator Output
MAX17671 Small-Footprint 5V Output
VIN
6.5V TO 60V
C1
1µF
R1
3.32MΩ
R2
787kΩ
VOUTL
3.3V, 50mA
C2
2.2µF
IN
LX
EN/UVLO
MAX17671F
OUTL
C3
4.7µF
VOUT
5V, 100mA
GND
FBBUCK
MODE/SYNC
RT
L1
68µH
EP
MODE/SYNC:
CONNECT TO GND FOR PWM MODE
UNCONNECTED FOR PFM MODE
RESET
INL
L1 : LPS3015-683MR
C1 : 1.0µF/X7R/100V/1206
C2 : 2.2µF/X7R/10V/0603 (GRM188R71A225KE15)
C3 : 4.7µF/X7R/16V/0603 (GRM188Z71C475KE21)
fSW : 600kHz
Figure 6. Fixed 5.0V Step-Down Converter Output at 600kHz Switching Frequency and 3.3V Linear Regulator Output
www.maximintegrated.com
Maxim Integrated │ 22
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
VIN
4.5V TO 42V
C1
1µF
R1
3.32MΩ
R2
1.27MΩ
VOUTL
3V, 20mA
IN
LX
EN/UVLO
C3
4.7µF
VOUT
3.3V, 130mA
GND
MAX17670E
OUTL
C2
2.2µF
L1
47µH
FBBUCK
MODE/SYNC
RT
RESET
INL
EP
MODE/SYNC:
CONNECT TO GND FOR PWM MODE
UNCONNECTED FOR PFM MODE
L1 : LPS3015-473MR
C1 : 1.0µF/X7R/100V/1206
C2 : 2.2µF/X7R/10V/0603 (GRM188R71A225KE15)
C3 : 4.7µF/X7R/16V/0603 (GRM188Z71C475KE21)
fSW : 600kHz
Figure 7. Fixed 3.3V Step-Down Converter Output at 600kHz Switching Frequency and 3.0V Linear Regulator Output
MAX17672 Small-Footprint 5V Output
VIN
6.5V TO 60V
C1
1µF
R1
3.32MΩ
R2
787kΩ
VOUTL
1.8V, 50mA
C2
2.2µF
IN
LX
EN/UVLO
MAX17672C
OUTL
C3
4.7µF
EP
MODE/SYNC:
CONNECT TO GND FOR PWM MODE
UNCONNECTED FOR PFM MODE
VOUT
5V, 100mA
GND
R3
261kΩ
FBBUCK
MODE/SYNC
RT
L1
68µH
R4
49.9kΩ
RESET
INL
VOUT
L1 : LPS3015-683MR
C1 : 1.0µF/X7R/100V/1206
C2 : 2.2µF/X7R/10V/0603 (GRM188R71A225KE15)
C3 : 4.7µF/X7R/16V/0603 (GRM188Z71C475KE21)
fSW : 600kHz
Figure 8. Adjustable 5.0V Step-Down Converter Output at 600kHz Switching Frequency and 1.8V Linear Regulator Output
www.maximintegrated.com
Maxim Integrated │ 23
MAX17670, MAX17671,
MAX17672
Integrated 4V-60V, 150mA, High-Efficiency,
Synchronous Step-Down DC-DC Converter
with 50mA Linear Regulator
Ordering Information
PART NUMBER
BUCK OUTPUT
VOLTAGE (V)
LINEAR REGULATOR OUTPUT
VOLTAGE (V)
PIN PACKAGE
MAX17670AATB+*
3.3
1.2
10-Pin TDFN
MAX17670BATB+*
3.3
1.5
10-Pin TDFN
MAX17670CATB+*
3.3
1.8
10-Pin TDFN
MAX17670DATB+*
3.3
2.5
10-Pin TDFN
MAX17670EATB+
3.3
3.0
10-Pin TDFN
MAX17670EATB+T
3.3
3.0
10-Pin TDFN
MAX17671AATB+*
5
1.2
10-Pin TDFN
MAX17671BATB+*
5
1.5
10-Pin TDFN
MAX17671CATB+*
5
1.8
10-Pin TDFN
MAX17671DATB+*
5
2.5
10-Pin TDFN
MAX17671EATB+*
5
3.0
10-Pin TDFN
MAX17671FATB+
5
3.3
10-Pin TDFN
MAX17671FATB+T
5
3.3
10-Pin TDFN
MAX17672AATB+*
Adjustable
1.2
10-Pin TDFN
MAX17672BATB+*
Adjustable
1.5
10-Pin TDFN
MAX17672CATB+
Adjustable
1.8
10-Pin TDFN
MAX17672CATB+T
Adjustable
1.8
10-Pin TDFN
MAX17672DATB+*
Adjustable
2.5
10-Pin TDFN
MAX17672EATB+*
Adjustable
3.0
10-Pin TDFN
MAX17672FATB+
Adjustable
3.3
10-Pin TDFN
MAX17672FATB+T
Adjustable
3.3
10-Pin TDFN
*Future product—contact factory for availability.
+Denotes a lead(Pb)-free/RoHS compliant package.
T=Tape-and-reel.
www.maximintegrated.com
Maxim Integrated │ 24
MAX17670, MAX17671,
MAX17672
Integrated 4V-60V, 150mA, High-Efficiency,
Synchronous Step-Down DC-DC Converter
with 50mA Linear Regulator
Revision History
REVISION
NUMBER
REVISION
DATE
0
6/18
Initial release
11/18
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+
4/20
Updated the General Description, Benefits and Features, Simplified Block Diagram,
Electrical Characteristics, Pin Description, Detailed Description, Linear Regulator PowerSupply 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
2
PAGES
CHANGED
DESCRIPTION
—
2–3, 13–15
17, 23–24
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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