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MAXM17901/MAXM17903
4.5V to 24V, 300mA Himalaya uSLIC
Step-Down Power Module
General Description
The Himalaya series of voltage regulator ICs and power
modules enable cooler, smaller, and simpler powersupply solutions. The MAXM17901/MAXM17903 are
a family of high-efficiency, synchronous step-down
DC-DC modules with integrated controller, MOSFETs,
compensation components, and inductor that operate
over a wide input-voltage range. The modules operate
from 4.5V to 24V input and deliver up to 300mA output
current. The MAXM17901 is a fixed 3.3V output modules.
The MAXM17903 is an adjustable output (0.9V to 5V)
module. The modules significantly reduce design
complexity, manufacturing risks, and offer a true plug and
play power/supply solution, reducing time-to-market.
Both modules employ peak-current-mode control
architecture. To reduce input inrush current, the modules
offer a fixed 4.1ms soft-start time.
The MAXM17901/03 modules are available in a low
profile, compact 10-pin, 2.6mm × 3mm × 1.5mm, uSLIC™
package.
Applications
●●
●●
●●
●●
●●
●●
●●
VIN
R1
2.2MΩ
R2
825kΩ
OUT
RESET
GND
MAXM17903
C1
1µF
19-100225; Rev 1; 11/18
EN/UVLO
FB
VCC
LX
MODE
● High Efficiency
• Selectable PWM- or PFM-Mode of Operation
• Shutdown Current as Low as 2.2μA (typ)
● Flexible Design
• Internal Soft-Start and Prebias Startup
• Open-Drain Power Good Output (RESET Pin)
• Programmable EN/UVLO Threshold
● Robust Operation
• Hiccup Overcurrent Protection
• Overtemperature Protection
• -40°C to +125°C Ambient Operating Temperature/
-40°C to +150°C Junction Temperature
Ordering Information appears at end of data sheet.
uSLIC is a trademark of Maxim Integrated Products, Inc.
Typical Application Circuit 2.5V
CIN
1µF
● Easy to Use
• Wide 4.5V to 24V Input
• Adjustable 0.9V to 5V Output
• Fixed 3.3V Output (MAXM17901)
• ±1.5% Feedback Accuracy
• Up to 300mA Output-Current
• Internally Compensated
• All Ceramic Capacitors
● Rugged
• Complies with CISPR22(EN55022) Class B
Conducted and Radiated Emissions
• Passes Drop, Shock, and Vibration Standards:
JESD22-B103, B104, B111
Industrial Sensors and Encoders
4-20mA Current-Loop Powered Sensors
LDO Replacement
HVAC and Building Control
Battery-Powered Equipment
General Purpose Point-of-Load
USB Type-C Powered Loads
VIN
12V
Benefits and Features
Typical Application Circuit 3.3V
VOUT
2.5V, 300mA
COUT
10µF
R3
133kΩ
R4
75kΩ
VIN
12V
CIN
1µF
VIN
OUT
EN/UVLO
GND
MAXM17901
C1
1µF
RESET
FB
VCC
LX
MODE
VOUT
3.3V, 300mA
COUT
10µF
MAXM17901/MAXM17903
4.5V to 24V, 300mA Himalaya uSLIC
Step-Down Power Module
Absolute Maximum Ratings
VIN, EN/UVLO to GND.............................................-0.3V to 29V
LX, OUT and GND......................................-0.3V to (VIN + 0.3V)
VCC, FB, RESET to GND...........................................-0.3V to 6V
MODE to GND........................................... -0.3V to (VCC + 0.3V)
Output Short-Circuit Duration.....................................Continuous
Junction Temperature (Note 1).........................................+150°C
Storage Temperature Range............................. -55°C to +125°C
Lead temperature (soldering,10s)....................................+260°C
Soldering Temperature (reflow)........................................+260°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.
Package Information
PACKAGE TYPE: 10-PIN uSLIC
Package Code
M102A3+2
Outline Number
21-100094
Land Pattern Number
90-100027
THERMAL RESISTANCE, FOUR-LAYER BOARD (Note 2)
Junction to Ambient (θJA)
41.56 ºC/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.
Note 1: Junction temperature greater than +125°C degrades operating lifetimes.
Note 2: Package thermal resistance is measured on an evaluation board with natural convection.
Electrical Characteristics
(VIN = VEN/UVLO = 12V, VGND = 0V, CVCC = 1μF, FB = 1V (MAXM17903), FB = 3.6V (MAXM17901), LX = MODE = RESET = OUT
= 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 3)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
24
V
INPUT SUPPLY (VIN)
Input-Voltage Range
Input-Shutdown Current
Input-Supply Current
VIN
4.5
IIN-SH
VEN/UVLO = 0V, shutdown mode
2.2
4
μA
IQ-PFM
MODE = unconnected,
FB = 1.03 × VFB-REG
95
160
μA
IQ-PWM
Normal switching mode, VIN = 12V ,
MODE=0
3.2
mA
ENABLE/UVLO (EN/UVLO)
EN/UVLO Threshold
VENR
VEN/UVLO rising
1.19
1.215
1.28
VENF
VEN/UVLO falling
1.06
1.09
1.16
V
+100
nA
VEN-TRUESD
EN/UVLO Input-Leakage
Current
IEN/UVLO
VEN/UVLO falling, true shutdown
0.75
TA = +25°C
-100
6V < VIN < 24V, 0mA < IVCC < 10mA
4.75
5
5.25
V
13
30
50
mA
LDO (VCC)
VCC Output-Voltage Range
VCC Current Limit
www.maximintegrated.com
VCC
IVCC-MAX
VCC = 4.3V
Maxim Integrated │ 2
MAXM17901/MAXM17903
4.5V to 24V, 300mA Himalaya uSLIC
Step-Down Power Module
Electrical Characteristics (continued)
(VIN = VEN/UVLO = 12V, VGND = 0V, CVCC = 1μF, FB = 1V (MAXM17903), FB = 3.6V (MAXM17901), LX = MODE = RESET = OUT
= 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 3)
PARAMETER
VCC Dropout
VCC UVLO
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
0.15
0.3
V
VCC-DO
VIN = 4.5V, IVCC = 5mA
VCC-UVR
VCC rising
4.05
4.18
4.3
VCC-UVF
VCC falling
3.7
3.8
3.95
3.8
4.1
4.4
MODE = GND, MAXM17903
0.887
0.90
0.913
MODE = unconnected, MAXM17903
0.887
0.915
0.936
MODE = GND, MAXM17901
3.25
3.30
3.35
MODE = unconnected, MAXM17901
3.25
3.35
3.42
MAXM17903
-100
-25
465
500
535
kHz
62.5
64.5
66.5
%
V
SOFT-START (SS)
Soft-Start Time
tSS
ms
FEEDBACK (FB)
FB-Regulation Voltage
FB-Leakage Current
VFB-REG
IFB
V
nA
TIMING
Switching Frequency
fSW
FB Undervoltage Trip Level to
Cause Hiccup
Hiccup Timeout
Minimum On-Time
Maximum Duty Cycle
RESET
131
tON-MIN
DMAX
FB = 0.98 × FBREG
ms
90
130
ns
89
91.4
94
%
FB Threshold for RESET
Rising
FB rising
93.5
95.5
97.5
%
FB Threshold for RESET
Falling
FB falling
90
92
94
%
RESET Delay After FB
Reaches Rising Threshold
2
ms
RESET Output-Level Low
IRESET = 5mA
0.2
V
RESET Output-Leakage
Current
VRESET = 5.5V, TA = +25°C
0.1
μA
MODE
MODE Internal Pullup
Resistor
500
kΩ
166
°C
10
°C
THERMAL SHUTDOWN
Thermal-Shutdown
Threshold
Thermal-Shutdown Hysteresis
Temperature rising
Note 3: Electrical specifications are production tested at TA = +25°C. Specifications over the entire operating temperature range are
guaranteed by design and characterization.
www.maximintegrated.com
Maxim Integrated │ 3
MAXM17901/MAXM17903
4.5V to 24V, 300mA Himalaya uSLIC
Step-Down Power Module
Typical Operating Characteristics
(VIN = VEN/UVLO = 12V, 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. The circuit values for different output-voltage applications are as in Table 1, unless otherwise noted.)
toc01
100
MAXM17903
EFFICIENCY vs. LOAD CURRENT
ADJUSTABLE VOUT = 1.5V, PWM MODE
80
80
80
70
70
50
VIN = 5V
40
50
10
0
60
90 120 150 180 210 240 270 300
MAXM17903
EFFICIENCY vs. LOAD CURRENT
ADJUSTABLE VOUT = 3.3V, PWM MODE
50
0
30
60
0
90 120 150 180 210 240 270 300
toc04
MAXM17901
EFFICIENCY vs. LOAD CURRENT
FIXED VOUT = 3.3V, PWM MODE
100
toc05
70
VIN = 5.5V
EFFICIENCY (%)
80
70
VIN = 5.5V
60
VIN = 12V
50
VIN = 20V
40
50
40
30
20
20
10
10
10
0
0
30
60
90 120 150 180 210 240 270 300
0
0
30
60
LOAD CURRENT (mA)
100
90 120 150 180 210 240 270 300
toc07
MAXM17903
EFFICIENCY vs. LOAD CURRENT
ADJUSTABLE VOUT = 2.5V, PFM MODE
100
toc08
100
VIN = 5V
70
70
VIN = 5V
30
VIN = 20V
60
50
40
20
10
10
0
0
10
LOAD CURRENT (mA)
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VIN = 20V
30
20
1
100
EFFICIENCY (%)
80
70
EFFICIENCY (%)
80
60
100
60
50
40
VIN = 12V VIN = 20V
30
VIN = 12V
toc09
VIN = 5.5V
90
90
VIN = 12V
10
MAXM17903
EFFICIENCY vs. LOAD CURRENT
ADJUSTABLE VOUT = 3.3V, PFM MODE
80
40
1
VIN = 12V
LOAD CURRENT (mA)
90
50
VIN = 5V
LOAD CURRENT (mA)
MAXM17903
EFFICIENCY vs. LOAD CURRENT
ADJUSTABLE VOUT = 1.5V, PFM MODE
toc06
60
20
30
90 120 150 180 210 240 270 300
70
30
0
60
100
90
VIN = 20V
30
MAXM17903
EFFICIENCY vs. LOAD CURRENT
ADJUSTABLE VOUT = 0.9V, PFM MODE
80
40
0
LOAD CURRENT (mA)
90
VIN = 12V
VIN = 20V
20
80
50
VIN = 12V
40
90
60
VIN = 5V
60
LOAD CURRENT (mA)
EFFICIENCY (%)
EFFICIENCY (%)
70
10
LOAD CURRENT (mA)
100
toc03
30
VIN = 20V
20
0
30
VIN = 12V
40
10
0
VIN = 5V
30
VIN = 12V
20
60
EFFICIENCY (%)
90
60
MAXM17903
EFFICIENCY vs. LOAD CURRENT
ADJUSTABLE VOUT = 2.5V, PWM MODE
100
90
30
EFFICIENCY (%)
toc02
90
EFFICIENCY (%)
EFFICIENCY (%)
100
MAXM17903
EFFICIENCY vs. LOAD CURRENT
ADJUSTABLE VOUT = 0.9V, PWM MODE
20
10
1
10
LOAD CURRENT (mA)
100
0
1
100
10
LOAD CURRENT (mA)
Maxim Integrated │ 4
MAXM17901/MAXM17903
4.5V to 24V, 300mA Himalaya uSLIC
Step-Down Power Module
Typical Operating Characteristics (continued)
(VIN = VEN/UVLO = 12V, 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. The circuit values for different output-voltage applications are as in Table 1, unless
otherwise noted.)
MAXM17901
EFFICIENCY vs. LOAD CURRENT
FIXED VOUT = 3.3V, PFM MODE
100
toc10
0.904
VIN = 5.5V
90
50
VIN = 12V
VIN = 20V
20
0.901
0.900
0.899
VIN = 5V
0.898
1
10
0.896
100
0
30
60
2.524
MAXM17903
OUTPUT VOLTAGE vs. LOAD CURRENT
ADJUSTABLE VOUT = 3.3V, PWM MODE
toc13
VIN = 5V
2.500
2.494
2.488
VIN = 12V
2.482
0
30
60
VIN = 5.5V
3.300
3.288
0
30
60
0.907
0.898
0.889
30
60
90 120 150 180 210 240 270 300
LOAD CURRENT (mA)
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OUTPUT VOLTAGE (V)
OUTPUT VOLTAGE (V)
VIN = 12V
0
3.300
90 120 150 180 210 240 270 300
1.55
VIN = 12V
VIN = 5.5V
0
30
60
90 120 150 180 210 240 270 300
LOAD CURRENT (mA)
MAXM17903
OUTPUT VOLTAGE vs. LOAD CURRENT
ADJUSTABLE VOUT = 2.5V, PFM MODE
toc17
VIN = 5V
1.53
VIN = 20V
1.52
VIN = 12V
1.51
toc18
2.54
2.46
60
90 120 150 180 210 240 270 300
LOAD CURRENT (mA)
VIN = 12V
2.50
2.48
30
VIN = 5V
2.52
1.49
0
VIN = 20V
2.56
1.50
1.48
VIN = 20V
2.58
1.54
VIN = 5V
0.916
3.304
3.302
MAXM17903
OUTPUT VOLTAGE vs. LOAD CURRENT
ADJUSTABLE VOUT = 1.5V, PFM MODE
toc16
90 120 150 180 210 240 270 300
3.306
LOAD CURRENT (mA)
0.934
0.925
60
3.308
VIN =20V
3.292
LOAD CURRENT (mA)
0.880
VIN = 12V
3.296
3.280
90 120 150 180 210 240 270 300
MAXM17903
OUTPUT VOLTAGE vs. LOAD CURRENT
ADJUSTABLE VOUT = 0.9V, PFM MODE
30
MAXM17901
OUTPUT VOLTAGE vs. LOAD CURRENT
FIXED VOUT = 3.3V, PWM MODE toc15
3.310
3.284
2.476
2.470
toc14
OUTPUT VOLTAGE (V)
OUTPUT VOLTAGE (V)
OUTPUT VOLTAGE (V)
3.304
2.506
0
LOAD CURRENT (mA)
OUTPUT VOLTAGE (V)
2.518
VIN = 20V
VIN = 20V
1.492
1.484
90 120 150 180 210 240 270 300
3.308
2.512
1.496
LOAD CURRENT (mA)
LOAD CURRENT (mA)
MAXM17903
OUTPUT VOLTAGE vs. LOAD CURRENT
ADJUSTABLE VOUT = 2.5V, PWM MODE
VIN = 12V
1.500
1.488
0.897
10
toc12
VIN = 5V
1.504
VIN = 12V
OUTPUT VOLTAGE (V)
OUTPUT VOLTAGE (V)
EFFICIENCY (%)
60
30
toc11
1.508
0.902
70
40
MAXM17903
OUTPUT VOLTAGE vs. LOAD CURRENT
ADJUSTABLE VOUT = 1.5V, PWM MODE
0.903
80
0
MAXM17903
OUTPUT VOLTAGE vs. LOAD CURRENT
ADJUSTABLE VOUT = 0.9V, PWM MODE
2.44
0
30
60
90 120 150 180 210 240 270 300
LOAD CURRENT (mA)
Maxim Integrated │ 5
MAXM17901/MAXM17903
4.5V to 24V, 300mA Himalaya uSLIC
Step-Down Power Module
Typical Operating Characteristics (continued)
(VIN = VEN/UVLO = 12V, 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. The circuit values for different output-voltage applications are as in Table 1, unless
otherwise noted.)
MAXM17903
OUTPUT VOLTAGE vs. LOAD CURRENT
ADJUSTABLE VOUT = 3.3V, PFM MODE
toc19
3.39
VIN = 5.5V
VIN = 12V
3.37
VIN = 20V
3.35
3.33
3.31
3.29
VIN = 5.5V
3.35
3.33
VOUT (AC)
0
30
60
90 120 150 180 210 240 270 300
3.29
3.25
VIN = 20V
MAXM17903 OUTPUT VOLTAGE RIPPLE
VIN = 12V, ADJUSTABLE VOUT = 3.3V,
FULL LOAD, PWM MODE
toc22
2µs/div
90 120 150 180 210 240 270 300
MAXM17903 INPUT VOLTAGE RIPPLE
VIN = 12V, ADJUSTABLE VOUT = 1.5V,
FULL LOAD, PWM MODE
toc24
10mV/div
2µs/div
MAXM17903 LOAD TRANSIENT RESPONSE
VIN = 12V, ADJUSTABLE VOUT = 1.5V, PFM MODE
(LOAD CURRENT STEPPED FROM 5mA TO 150mA)
MAXM17903 INPUT VOLTAGE RIPPLE
VIN = 12V, FIXED VOUT = 3.3V,
PWM MODE, FULL LOAD
toc26
100mV/div
100mV/div
VIN (AC)
2µs/div
MAXM17903 INPUT VOLTAGE RIPPLE
VIN = 12V, ADJUSTABLE VOUT = 3.3V,
FULL LOAD, PWM MODE
toc25
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60
VOUT (AC)
2µs/div
2µs/div
30
MAXM17901 OUTPUT VOLTAGE RIPPLE
VIN = 12V, FIXED VOUT = 3.3V,
PWM MODE , FULL LOAD
toc23
10mV/div
VIN (AC)
0
LOAD CURRENT (mA)
LOAD CURRENT (mA)
VOUT (AC)
10mV/div
VIN = 12V
3.31
3.27
3.27
3.25
toc21
3.37
OUTPUT VOLTAGE (V)
OUTPUT VOLTAGE (V)
3.39
MAXM17903 OUTPUT VOLTAGE RIPPLE
VIN = 12V, ADJUSTABLE VOUT = 1.5V,
FULL LOAD, PWM MODE
MAXM17901
OUTPUT VOLTAGE vs. LOAD CURRENT
FIXED VOUT = 3.3V, PFM MODE toc20
toc27
VOUT (AC)
20mV/div
IOUT
100mA/div
100mV/div
VIN (AC)
2µs/div
100µs/div
Maxim Integrated │ 6
MAXM17901/MAXM17903
4.5V to 24V, 300mA Himalaya uSLIC
Step-Down Power Module
Typical Operating Characteristics (continued)
(VIN = VEN/UVLO = 12V, 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. The circuit values for different output-voltage applications are as in Table 1, unless
otherwise noted.)
MAXM17903 LOAD TRANSIENT RESPONSE
VIN = 12V, ADJUSTABLE VOUT = 1.5V, PWM MODE
(LOAD CURRENT STEPPED FROM 150mA TO 300mA)
toc28
MAXM17903 LOAD TRANSIENT RESPONSE
VIN = 12V, ADJUSTABLE VOUT = 3.3V, PFM MODE
(LOAD CURRENT STEPPED FROM 5mA TO 150mA)
toc29
20mV/div
VOUT (AC)
MAXM17903 LOAD TRANSIENT RESPONSE
VIN = 12V, ADJUSTABLE VOUT = 3.3V, PWM MODE
(LOAD CURRENT STEPPED FROM 150mA TO 300mA)
100mV/div
VOUT (AC)
toc30
50mV/div
VOUT (AC)
100mA/div
IOUT
100mA/div
IOUT
100µs/div
100mA/div
IOUT
100µs/div
100µs/div
MAXM17901 LOAD TRANSIENT RESPONSE
VIN = 12V, FIXED VOUT = 3.3V, PWM MODE
(LOAD CURRENT STEPPED FROM 5mA TO 150mA)
MAXM17901 LOAD TRANSIENT RESPONSE
VIN = 12V, FIXED VOUT = 3.3V, PWM MODE
(LOAD CURRENT STEPPED FROM 150mA TO 300mA)
MAXM17903 STARTUP THROUGH ENABLE
VIN = 12V, ADJUSTABLE VOUT = 1.5V,
FULL LOAD, PWM MODE
toc33
toc32
toc31
5V/div
VOUT (AC)
VOUT (AC)
50mV/div
EN/UVLO
100mV/div
10V/div
1V/div
LX
100mA/div
IOUT
100mA/div
IOUT
VOUT
5V/div
RESET
100µs/div
100µs/div
1ms/div
MAXM17903 SHUTDOWN THROUGH ENABLE
VIN = 12V, ADJUSTABLE VOUT = 1.5V,
FULL LOAD, PWM MODE
toc34
MAXM17903 STARTUP THROUGH ENABLE
VIN = 12V, ADJUSTABLE VOUT = 3.3V,
FULL LOAD, PWM MODE
toc35
MAXM17903 SHUTDOWN THROUGH ENABLE
VIN = 12V, ADJUSTABLE VOUT = 3.3V,
FULL LOAD, PWM MODE
toc36
5V/div
5V/div
EN/UVLO
10V/div
LX
VOUT
1V/div
RESET
5V/div
100µs/div
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EN/UVLO
EN/UVLO
LX
10V/div
2V/div
VOUT
5V/div
RESET
1ms/div
5V/div
LX
10V/div
VOUT
2V/div
RESET
5V/div
100µs/div
Maxim Integrated │ 7
MAXM17901/MAXM17903
4.5V to 24V, 300mA Himalaya uSLIC
Step-Down Power Module
Typical Operating Characteristics (continued)
(VIN = VEN/UVLO = 12V, 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. The circuit values for different output-voltage applications are as in Table 1, unless
otherwise noted.)
MAXM17903 STARTUP THROUGH ENABLE (2V PREBIAS)
VIN = 12V, ADJUSTABLE VOUT = 3.3V,
NO LOAD, PWM MODE
toc37
10V/div
LX
10V/div
2V/div
VOUT
5V/div
RESET
5V/div
EN/UVLO
EN/UVLO
LX
toc39
5V/div
5V/div
EN/UVLO
MAXM17901 STARTUP THROUGH ENABLE
VIN = 12V, FIXED VOUT = 3.3V,
FULL LOAD, PWM MODE
MAXM17903 STARTUP THROUGH ENABLE (2V PREBIAS)
VIN = 12V, ADJUSTABLE VOUT = 3.3V,
NO LOAD, PFM MODE
toc38
2V/div
2V/div
VOUT
5V/div
VOUT
1ms/div
1ms/div
1ms/div
toc40
5V/div
RESET
RESET
MAXM17901 SHUTDOWN THROUGH ENABLE
VIN = 12V, FIXED VOUT = 3.3V,
FULL LOAD, PWM MODE
10V/div
LX
MAXM17901 STARTUP THROUGH ENABLE (2V PREBIAS)
VIN = 12V, FIXED VOUT = 3.3V,
NO LOAD, PWM MODE
toc41
MAXM17901 STARTUP THROUGH ENABLE (2V PREBIAS)
VIN = 12V, FIXED VOUT = 3.3V,
NO LOAD, PFM MODE
toc42
5V/div
EN/UVLO
5V/div
10V/div
LX
EN/UVLO
5V/div
EN/UVLO
10V/div
LX
LX
10V/div
2V/div
2V/div
VOUT
2V/div
VOUT
RESET
5V/div
RESET
100µs/div
5V/div
RESET
1ms/div
MAXM17903 STARTUP THROUGH VIN
VIN = 12V, ADJUSTABLE VOUT = 1.5V,
FULL LOAD, PWM MODE
1ms/div
MAXM17903 STARTUP THROUGH VIN
VIN = 12V, ADJUSTABLE VOUT = 3.3V,
FULL LOAD, PWM MODE
MAXM17903 SHUTDOWN THROUGH VIN
VIN = 12V,ADJUSTABLE VOUT = 1.5V,
FULL LOAD, PWM MODE
toc44
toc43
5V/div
VOUT
toc45
10V/div
VIN
10V/div
LX
2V/div
500mV/div
10V/div
VIN
10V/div
VIN
LX
10V/div
LX
2V/div
VCC
VCC
VOUT
VOUT
1ms/div
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10V/div
2V/div
500mV/div
1ms/div
2V/div
VCC
VOUT
1ms/div
Maxim Integrated │ 8
MAXM17901/MAXM17903
4.5V to 24V, 300mA Himalaya uSLIC
Step-Down Power Module
Typical Operating Characteristics (continued)
(VIN = VEN/UVLO = 12V, 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. The circuit values for different output-voltage applications are as in Table 1, unless
otherwise noted.)
MAXM17901 STARTUP THROUGH VIN
VIN = 12V, FIXED VOUT = 3.3V,
FULL LOAD, PWM MODE
MAXM17903 SHUTDOWN THROUGH VIN
VIN = 12V, ADJUSTABLE VOUT = 3.3V,
FULL LOAD, PWM MODE
MAXM17903 SHUTDOWN THROUGH VIN
VIN = 12V, ADJUSTABLE VOUT = 3.3V,
FULL LOAD, PWM MODE
toc47
toc46
toc48
10V/div
VIN
10V/div
VIN
10V/div
LX
10V/div
LX
VIN
10V/div
LX
10V/div
2V/div
2V/div
VCC
2V/div
VCC
VCC
2V/div
VOUT
2V/div
VOUT
VOUT
2V/div
1ms/div
1ms/div
1ms/div
MAXM17903 OUTPUT SHORT DURING STARTUP
VIN=12V, ADJUSTABLE VOUT=3.3V,
FULL LOAD, PWM MODE
MAXM17903 OUTPUT SHORT IN STEADY STATE
VIN = 12V, ADJUSTABLE VOUT = 3.3V,
FULL LOAD, PWM MODE toc49
toc50
10V/div
5V/div
VIN
SHORT
VOUT
2V/div
LX
20V/div
IOUT
200mA/div
VOUT
2V/div
LX
10V/div
IOUT
200mA/div
20ms/div
20ms/div
MAXM17901 OUTPUT SHORT IN STEADY STATE
VIN = 12V, FIXED VOUT = 3.3V, FULL LOAD, PWM MODE
toc51
MAXM17901 OUTPUT SHORT DURING STARTUP
VIN = 12V, FIXED VOUT = 3.3V, FULL LOAD, PWM MODE
toc52
10V/div
5V/div
VIN
SHORT
VOUT
2V/div
LX
10V/div
IOUT
500mA/div
20ms/div
www.maximintegrated.com
VOUT
2V/div
LX
10V/div
IOUT
200mA/div
20ms/div
Maxim Integrated │ 9
MAXM17901/MAXM17903
4.5V to 24V, 300mA Himalaya uSLIC
Step-Down Power Module
Typical Operating Characteristics (continued)
(VIN = VEN/UVLO = 12V, 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. The circuit values for different output-voltage applications are as in Table 1, unless
otherwise noted.)
80
0
0
GAIN
-20
-30
30
20
0
0
GAIN
-30
-60
CROSSOVER FREQUENCY = 51.42kHz
PHASE MARGIN = 53.85°
1k
-80
1k
0
0
GAIN
-20
30
-30
CROSSOVER FREQUENCY = 47.132 kHz
PHASE MARGIN = 61.4°
-80
1k
10k
-60
-90
100k
FREQUENCY (Hz)
MAXM17901
OUTPUT CURRENT vs. AMBIENT TEMPERATURE
toc56
350
toc57
350
300
300
OUTOPUT CURRENT (mA)
OUTOPUT CURRENT (mA)
20
-60
-90
100k
10k
MAXM17903
OUTPUT CURRENT vs. AMBIENT TEMPERATURE
250
200
150
ADJUSTABLE
VOUT = 2.5V
100
250
200
FIXED VOUT = 3.3V
150
100
50
50
70
50
90
110
0
130
50
70
CONDUCTED EMISSION PLOT
(WITH FILTER C = 0.1µF + 0.47µF, L = 82µH, C = 1µF)
40
PEAK
EMISSION
30
20
60
MAGNITUDE (dBµV/m)
CISPR-22 CLASS B AVG LIMIT
50
130
toc59
70
CISPR-22 CLASS B QP LIMIT
60
110
RADIATED EMISSION PLOT
toc58
70
90
AMBIENT TEMPERATURE (°C)
AMBIENT TEMPERATURE (°C)
MAGNITUDE (dBµV)
PHASE
FREQUENCY (Hz)
FREQUENCY (Hz)
0
-60
CROSSOVER FREQUENCY = 46.25 kHz
PHASE MARGIN = 56.7°
-60
-90
100k
10k
90
-40
-40
-60
toc55
60
40
PHASE
-20
-40
-80
60
60
40
GAIN (dB)
30
20
PHASE MARGIN (°)
PHASE
80
90
60
60
40
GAIN (dB)
90
MAXM17901 BODE PLOT
VIN = 12V, FIXED VOUT = 3.3V,
FULL LOAD, PWM MODE
PHASE MARGIN (˚)
60
toc53
GAIN (dB)
80
MAXM17903 BODE PLOT
VIN = 12V, ADJUSTABLE VOUT = 3.3V,
FULL LOAD, PWM MODE
toc54
PHASE MARGIN (˚)
MAXM17903 BODE PLOT
VIN = 12V, ADJUSTABLE VOUT = 1.5V,
FULL LOAD, PWM MODE
50
40
CISPR-22 CLASS B QP LIMIT
30
VERTICAL
SCAN
20
10
10
AVERAGE
EMISSION
150k
1M
10M
FREQUENCY(Hz)
CONDITIONS: VIN = 12V, VOUT = 3.3V, IOUT = 0.3A
www.maximintegrated.com
0
-10
HORIZONTAL
SCAN
30M
100M
FREQUENCY(Hz)
1G
CONDITIONS: VIN = 12V, VOUT = 3.3V, IOUT = 0.3A
Maxim Integrated │ 10
MAXM17901/MAXM17903
4.5V to 24V, 300mA Himalaya uSLIC
Step-Down Power Module
Pin Configuration
TOP VIEW
+
10
VIN
9
VIN
8
EN/UVLO
4
7
VCC
5
6
FB
LX
1
GND
2
RESET
3
MODE
OUT
MAXM17901
MAXM17903
‘+’ INDICATES PIN 1 OF THE MODULE
Pin Description
PIN
NAME
1
LX
2
GND
3
RESET
Open-Drain Power-Good Output. Pull up RESET to an external power supply with an external resistor.
RESET goes low if FB drops below 92% of its set value. RESET goes high impedance 2ms after FB
rises above 95.5% of its set value. See the Electrical Characteristics table for threshold values.
4
MODE
PFM/PWM Mode-Selection Input. Connect MODE to GND to enable fixed-frequency PWM operation
at all loads. Leave MODE unconnected for PFM operation at light load.
5
OUT
6
FB
7
VCC
8
EN/UVLO
9–10
VIN
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FUNCTION
Switching Node of the Inductor. No external connection to this pin.
Ground Pin. Connect GND to the ground plane. See the PCB Layout Guidelines section for more details.
Refer to the MAXM17903 EV kit for a sample layout.
Module Output Pin. Connect a capacitor from OUT to GND.
See the PCB Layout Guidelines section for more details.
Output Feedback Connection. Connect FB to a resistor-divider between OUT and GND to set the output
voltage for MAXM17903. Connect to output voltage node (VOUT) for MAXM17901.
See Output-Voltage Setting section for more details.
Internal LDO Power Output. Bypass VCC to GND with a minimum 1µF ceramic capacitor.
Active-High, Enable/Undervoltage-Detection Input. Pull EN/UVLO to GND to disable the module output.
Connect EN/UVLO to VIN for always-on operation. Connect a resistor-divider between VIN, EN/UVLO,
and GND to program the input voltage at which the module turns on.
Power-Supply Input. Connect the VIN pins together. Decouple to GND with a capacitor; place the
capacitor close to the VIN and GND pins. See Table 1 for more details.
Maxim Integrated │ 11
MAXM17901/MAXM17903
4.5V to 24V, 300mA Himalaya uSLIC
Step-Down Power Module
Functional Diagrams
Internal Diagram
MAXM17901/MAXM17903
VCC
VIN
LDO
HIGH-SIDE
DRIVER
EN/UVLO
LX
1.215V
33µH
PEAK
CURRENT-MODE
CONTROLLER
OSCILLATOR
LOW-SIDE
DRIVER
OUT
SOFT-START
MODE
GND
MODE
SELECTION
LOGIC
SLOPE
COMPENSATION
*S1
FB
*S2
R3
RESET
LOGIC
RESET
R4
* IMPLIES REFER TO TABLE A
Table A
MODULE PART NUMBER
S1
S2
R3 (KΩ)
R4 (KΩ)
MAXM17903
CLOSE
OPEN
OPEN
OPEN
MAXM17901
OPEN
CLOSE
205.33
77
www.maximintegrated.com
Maxim Integrated │ 12
MAXM17901/MAXM17903
Detailed Description
The MAXM17901/MAXM17903 are a family of highefficiency, synchronous step-down DC-DC modules with
integrated controller, MOSFETs, compensation components, and inductor that operate over a wide input-voltage
range. The modules deliver an output current up to
300mA. The MAXM17901 is a fixed 3.3V output modules.
The MAXM17903 is an adjustable output (0.9V to 5V)
module. When EN/UVLO and VCC UVLO are ascertained,
an internal power-up sequence ramps up the error-amplifier reference, resulting in an output-voltage soft-start.
The FB pin monitors the output voltage through a resistordivider. The RESET pin transitions to a high-impedance
state 2ms after the output voltage reaches 95.5% of
regulation. The devices select either PFM or forcedPWM mode depending on the state of the MODE pin at
power-up. By pulling the EN/UVLO pin to low, the devices
enter shutdown mode and consumes only 2.2μA (typ) of
standby current.
The modules use an internally compensated, fixedfrequency, current-mode control scheme. On the rising
edge of an internal clock, the high-side pMOSFET turns
on. An internal error amplifier compares the feedback
voltage to a fixed internal 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 pMOSFET, the inductor current ramps
up. For the remainder of the switching period (off-time),
the pMOSFET is kept off and the low-side nMOSFET
turns on. During the off-time, the inductor releases the
stored energy as the inductor current ramps down, providing current to the output. Under overload conditions,
the cycle-by-cycle current-limit feature limits the inductor
peak current by turning off the high-side pMOSFET and
turning on the low-side nMOSFET.
Mode Selection (MODE)
The logic state of the MODE pin is latched after VCC
and EN/UVLO voltages exceed respective UVLO rising
thresholds and all internal voltages are ready to allow LX
switching. If the MODE pin is unconnected at power-up,
the part operates in PFM mode at light loads. If the MODE
pin is grounded at power-up, the part operates in constant-frequency PWM mode at all loads. State changes
on the MODE pin are ignored during normal operation.
PWM Operation
In PWM mode, the module output current is allowed to
go negative. PWM operation is useful in frequency sensitive applications and provides fixed switching frequency
www.maximintegrated.com
4.5V to 24V, 300mA Himalaya uSLIC
Step-Down Power Module
operation at all loads. However, PWM-mode of operation
gives lower efficiency at light loads compared to PFMmode of operation.
PFM Operation
PFM mode operation disables negative output current
from the module, and skips pulses at light loads for better efficiency. In PFM mode, the module output current
is forced to a fixed peak of 130mA in every clock cycle
until the output voltage rises to 102.3% of the nominal
value. Once the output voltage reaches 102.3% of the
nominal value, the high-side switch is turned off and the
low-side switch is turned on. Once the module output current hits zero cross, LX goes to a high-impedance state
and the module enters hibernate operation until the load
current discharges the output voltage to 101.1% of the
nominal value. Most of the internal blocks are turned off in
hibernate operation to save quiescent current. When the
output voltage falls below 101.1% of the nominal value,
the module comes out of hibernate operation, turns on all
internal blocks, and commences the process of delivering
pulses of energy until the output voltage reaches 102.3%
of the nominal value. The module naturally comes out
of PFM mode and serves load requirements when the
module output demands more than 130mA peak. The
advantage of PFM mode is higher efficiency at light loads
because of lower quiescent current drawn from supply.
Internal 5V Regulator
An internal regulator provides a 5V nominal supply to power
the internal functions and to drive the power MOSFETs. The
output of the linear regulator (VCC) should be bypassed
with a 1μF ceramic capacitor to GND. The VCC regulator dropout voltage is typically 150mV. An undervoltage
lockout circuit that disables the buck converter when VCC
falls below 3.8V (typ). The 400mV, VCC-UVLO hysteresis
prevents chattering on power-up and power-down.
Enable/Undervoltage Lockout (EN/UVLO),
Soft-Start
When EN/UVLO voltage is above 1.215V (typ), the
device’s internal error-amplifier reference voltage starts
to ramp up. The duration of the soft-start ramp is 4.1ms
(typ), allowing a smooth increase of the output voltage.
Driving EN/UVLO low disables both power MOSFETs, as
well as other internal circuitry, and reduces VIN quiescent
current to below 2.2μA. EN/UVLO can be used as an
input-voltage UVLO adjustment input. An external voltage-divider between VIN and EN/UVLO to GND adjusts
the input voltage at which the device turns on or turns off.
If input UVLO programming is not desired, connect EN/
UVLO to VIN (see the Electrical Characteristics table for
EN/UVLO rising and falling threshold voltages).
Maxim Integrated │ 13
MAXM17901/MAXM17903
4.5V to 24V, 300mA Himalaya uSLIC
Step-Down Power Module
RESET Output (RESET)
Thermal Overload Protection
Startup into a Prebiased Output
Applications Information
The devices include an open-drain RESET output to
monitor the output voltage. RESET goes high impedance
2ms after the output rises above 95.5% of its nominal set
value and pulls low when the output voltage falls below
92% of the set nominal regulated voltage. RESET asserts
low during the hiccup timeout period.
The devices are capable of soft-start into a prebiased output, without discharging the output capacitor in both the
PFM and forced-PWM modes. Such a feature is useful in
applications where digital integrated circuits with multiple
rails are powered.
Overcurrent Protection (OCP)/Hiccup Mode
The MAXM17901/MAXM17903 are provided with a robust
overcurrent protection (OCP) scheme that protects the
modules under overload and output short-circuit conditions. The power module measures and limits peak
inductor current. When overcurrent is detected in the
inductor, or if the FB node goes below 64.5% of its nominal regulation threshold, the module enters hiccup mode
of operation. In hiccup mode, the module is protected
by suspending switching for a hiccup timeout period of
131ms (typ). Once the hiccup timeout period expires,
soft-start is attempted again. Hiccup mode of operation
ensures low power dissipation under output overload or
short-circuit conditions. Once the hiccup timeout period
expires, soft-start is attempted again.
The MAXM17901/03 are designed to support a maximum
load current of 300mA. The inductor ripple current is
calculated as follows:
∆I
VIN − VOUT − 4.85 × I OUT VOUT + 3.05 × I OUT
×
L × f SW
VIN − 1.8 × I OUT
Where:
VOUT = Steady-state output voltage
VIN = Operating input voltage for given VOUT
fSW = Switching Frequency
L = Power module output inductance (33µH ±30%)
IOUT = Required output (load) current
The following condition should be satisfied at the desired
load current, IOUT.
I OUT +
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∆I
< 0.49
2
Thermal overload protection limits the total power dissipation in the device. When the junction temperature
exceeds +166°C, an on-chip thermal sensor shuts down
the device, turns off the internal power MOSFETs, allowing the device to cool down. The thermal sensor turns the
device on after the junction temperature cools by 10°C.
Input-Voltage Range
The minimum and maximum operating input voltages for
a given output voltage should be calculated as follows:
=
VIN(MIN)
VOUT + (I OUT × 3.05)
D MAX
VIN(MAX) =
+ (I OUT × 1.8)
VOUT
t ON(MIN) × f SW
where:
VOUT = Steady-state output voltage,
IOUT = Maximum load current,
fSW = Worst-case switching frequency(535000 Hz),
DMAX = Maximum duty cycle (0.89),
tON(MIN) = Worst-case minimum controllable switch ontime (130ns).
Also, for duty cycle > 0.5;
VIN(MIN) > ((4.27 × VOUT) − 9.76)
For MAXM17901, VIN(MIN) = 5.5V, VIN(MAX) = 24V
Selection of Input Capacitor
The input filter capacitor reduces peak currents drawn
from the power source and reduces noise and voltage
ripple on the input caused by the converter’s switching.
The input capacitor RMS current requirement (IRMS) is
defined by the following equation:
=
IRMS I OUT(MAX) ×
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,
I OUT(MAX)
IRMS(MAX) =
2
Maxim Integrated │ 14
MAXM17901/MAXM17903
Choose an input capacitor that exhibits less than a +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 =
I OUT(MAX) × D MAX × (1 − D MAX )
f SW × ∆VIN
where:
DMAX = Maximum duty cycle(0.89),
fSW = Switching frequency,
∆VIN = Allowable input-voltage ripple.
Selection of Output Capacitor
Small ceramic X7R-grade capacitors are sufficient and
recommended for output-voltage generation. The output
capacitor has two functions. It provides smooth voltage
and, stores sufficient energy to support the output voltage
under load transient conditions and stabilizes the device’s
internal control loop. Usually the output capacitor is sized
to support a step load of 50% of the maximum output current in the application, such that the output-voltage deviation is less than 3%. Required output capacitance can be
calculated from the following equation:
C OUT =
30
VOUT
where COUT is the output capacitance in μF and VOUT
is the output voltage. Derating of ceramic capacitors with
DC-voltage must be considered while selecting the output
capacitor.
Setting the Input Undervoltage-Lockout Level
The devices offer an adjustable input undervoltage lockout level. Set the voltage at which the device turns on with
a resistive voltage-divider connected from VIN to GND
(see Figure 1). Connect the center node of the divider to
EN/UVLO.
Choose R1 to be 3.3MΩ (max), and then calculate R2 as
follows:
R1× 1.215
R2 =
VINU − 1.215
where VINU is the voltage at which the device is required
to turn on.
If the EN/UVLO pin is driven from an external signal
source, a series resistance of minimum 1kΩ is recommended to be placed between the signal source output
and and the EN/UVLO pin, to reduce voltage ringing on
the line.
Output-Voltage Setting
The MAXM17903 output voltage can be programmed
from 0.9V to 5V. Set the output voltage by connecting a
resistor-divider from output to FB to GND (see Figure 2).
Choose R4 less than or equal to 75kΩ and calculate R3
with the following equation:
V
R3 =
R4 × OUT − 1
0.9
Connect FB of MAXM17901 directly to VOUT for feedback
control.
OUT
VIN
R1
4.5V to 24V, 300mA Himalaya uSLIC
Step-Down Power Module
MAXM17901
MAXM17903
EN/UVLO
MAXM17903
FB
R4
R2
Figure 1. Adjustable EN/UVLO Network
www.maximintegrated.com
R3
Figure 2. Setting the Output Voltage
Maxim Integrated │ 15
MAXM17901/MAXM17903
4.5V to 24V, 300mA Himalaya uSLIC
Step-Down Power Module
Table 1. Selection of Components
PART
NUMBER
V IN(MIN) V IN(MAX) V OUT*
(V)
(V)
(V)
R3
(kΩ)
C OUT
R4
(kΩ)
4.5
12.5
0.9
1 x 1µF 0805 25V
1 x 47µF 1210 6.3V
(Murata GR219R71E105KA88D) (Murata GRM32ER70J476KE20L)
4.5
14
1
1 x 1µF 0805 25V
1 x 47µF 1210 6.3V
(Murata GR219R71E105KA88D) (Murata GRM32ER70J476KE20L)
8.33
75
4.5
17
1.2
1 x 1µF 0805 25V
1 x 47µF 1210 6.3V
(Murata GR219R71E105KA88D) (Murata GRM32ER70J476KE20L)
25
75
4.5
21.5
1.5
1 x 1µF 0805 25V
1 x 22µF 1206 6.3V
(Murata GR219R71E105KA88D) (Murata GRM31CR70J226KE19L)
50
75
4.5
24
1.8
1 x 1µF 0805 50V
1 x 22µF 1206 6.3V
(Murata GRM21BR71105KA12L) (Murata GRM31CR70J226KE19L)
75
75
4.5
24
2.5
1 x 1µF 0805 50V
1 x 22µF 1206 6.3V
(Murata GRM21BR71105KA12L) (Murata GRM31CR70J226KE19L)
133
75
5.5
24
3.3
1 x 1µF 0805 50V
1 x 10µF 1206 6.3V
(Murata GRM21BR71105KA12L) (Murata GRM31CR70J106KA01L)
200
75
12
24
5
1 x 1µF 0805 50V
1 x 10µF 1206 6.3V
(Murata GRM21BR71105KA12L) (Murata GRM31CR70J106KA01L)
348
75
5.5
24
3.3
1 x 1μF 0805 50V
1 x 10μF 1206 6.3V
(Murata GRM21BR71105KA12L) (Murata GRM31CR70J106KA01L)
N/A
N/A
MAXM17903
MAXM17901
C IN
SHORT OPEN
* The modules have a pulse skip algorithm that allows VOUT to be regulated beyond the VIN(MAX) specified in the above table, up to 24V.
Power Dissipation
The power dissipation inside the module leads to
increase in the junction temperature of the MAXM17901/
MAXM17903. The power loss inside the module at full
load can be estimated as follows:
1
PLOSS
= POUT × − 1
η
Where η is the efficiency of the power module at the
desired operating conditions. The junction temperature
(TJ) of the module can be estimated at any given maximum
ambient temperature (TA) from the following equation:
T=
J T A + θ JA × PLOSS
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For the MAXM17901/MAXM17903 evaluation board,
the thermal resistance from junction-to-ambient (θJA) is
41.56°C/W. Operating the module at junction temperatures greater than +125°C degrades operating lifetimes.
An EESIM model is available for the MAXM17901/
MAXM17903 to simulate efficiency and power loss for the
desired operating conditions.
PCB Layout Guidelines
Use the following guidelines for good PCB layout:
●● Keep the input capacitors as close as possible to the
IN and GND pins.
●● Keep the output capacitors as close as possible to
the OUT and GND pins.
●● Keep the resistive feedback dividers as close as
possible to the FB pin.
●● Keep the power traces and load connections short.
Refer to the EV kit layout for first-pass success.
Maxim Integrated │ 16
MAXM17901/MAXM17903
4.5V to 24V, 300mA Himalaya uSLIC
Step-Down Power Module
VIN
CIN
VIN
VOUT
OUT
RESET
R1
COUT
R3
MAXM17903
R2
EN/UVLO
FB
VCC
LX
CVCC
R4
MODE
GND
CIN
GND PLANE
1
+
LX
MAXM17903
VIN PLANE
10
VIN
9
VIN
GND
2
RESET
3
8
EN/UVLO
MODE
4
7
VCC
OUT
5
6
R1
R2
CVCC
FB
VOUT PLANE
COUT
R3
GND PLANE
R4
VIA TO INNER LAYER FOR ROUTING FB
Figure 3. Adjustable Output Layout Guidelines
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Maxim Integrated │ 17
MAXM17901/MAXM17903
4.5V to 24V, 300mA Himalaya uSLIC
Step-Down Power Module
VIN
CIN
VIN
VOUT
OUT
COUT
RESET
R1
MAXM17901
R2
EN/UVLO
FB
VCC
LX
CVCC
MODE
GND
CIN
GND PLANE
1
GND
2
+
LX
MAXM17901
VIN PLANE
10
VIN
9
VIN
R1
RESET
3
8
EN/UVLO
MODE
4
7
VCC
OUT
5
6
R2
CVCC
FB
VOUT PLANE
COUT
GND PLANE
VIA TO INNER LAYER FOR ROUTING FB
Figure 4. Fixed Output Layout Guidelines
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Maxim Integrated │ 18
MAXM17901/MAXM17903
4.5V to 24V, 300mA Himalaya uSLIC
Step-Down Power Module
Typical Application Circuits
Typical Application Circuit for Adjustable 2.5V output
VIN
4.5V TO 24V
C1
1µF
VIN
OUT
EN/UVLO
GND
VOUT
2.5V, 300mA
C2
22µF
MAXM17903
C3
1µF
RESET
FB
VCC
LX
R1
133kΩ
R2
75kΩ
MODE
MODE = GND FOR PWM
MODE = OPEN FOR PFM
C1 = MURATA 1μF/X7R/50V/0805 (GRM21BR71H105KA12L)
C2 = MURATA 22μF/X7R/6.3V/1206 (GRM31CR70J226KE19L)
C3 = MURATA 1μF/X7R/6.3V/0603 (GRM188R70J105K)
Typical Application Circuit for Adjustable 1.5V output
VIN
4.5V TO 21.5V
C1
1µF
VIN
OUT
EN/UVLO
GND
VOUT
1.5V, 300mA
C2
22µF
MAXM17903
C3
1µF
RESET
FB
VCC
LX
MODE
R1
50kΩ
R2
75kΩ
MODE = GND FOR PWM
MODE = OPEN FOR PFM
C1 = MURATA 1μF/X7R/25V/0805 (GRM219R71E105KA88D)
C2 = MURATA 22μF/X7R/6.3V/1206 (GRM31CR70J226KE19L)
C3 = MURATA 1μF/X7R/6.3V/0603 (GRM188R70J105K)
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Maxim Integrated │ 19
MAXM17901/MAXM17903
4.5V to 24V, 300mA Himalaya uSLIC
Step-Down Power Module
Typical Application Circuits (continued)
Typical Application Circuit for Fixed 3.3V output
VIN
5.5V TO 24V
C1
1µF
VIN
OUT
EN/UVLO
GND
VOUT
3.3V, 300mA
C2
10µF
MAXM17901
C3
1µF
RESET
FB
VCC
LX
MODE
MODE = GND FOR PWM
MODE = OPEN FOR PFM
C1 = MURATA 1μF/X7R/50V/0805 (GRM21BR71H105KA12L)
C2 = MURATA 10μF/X7R/6.3V/1206 (GRM31CR70J106KA01L)
C3 = MURATA 1μF/X7R/6.3V/0603 (GRM188R70J105K)
Ordering Information
PART
NUMBER
TEMP
RANGE
PIN-PACKAGE
MAXM17901AMB+
-40°C to +125°C
10-pin uSLIC
MAXM17901AMB+T
-40°C to +125°C
10-pin uSLIC
MAXM17903AMB+
-40°C to +125°C
10-pin uSLIC
MAXM17903AMB+T
-40°C to +125°C
10-pin uSLIC
+ Denotes a lead(Pb)-free/RoHS-compliant package.
T Denotes tape-and-reel.
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Maxim Integrated │ 20
MAXM17901/MAXM17903
4.5V to 24V, 300mA Himalaya uSLIC
Step-Down Power Module
Revision History
REVISION
NUMBER
REVISION
DATE
0
12/17
Initial release
11/18
Updated the Title, General Description, Benefits and Features, Applications,
Absolute Maximum Ratings, Electrical Characteristics, Typical Operating
Characteristics, Pin Description, Detailed Description, Overcurrent Protection (OCP)/
Hiccup Mode, Input-Voltage Range, Output-Voltage Setting, Power Dissipation
sections, Table A, Table 1, and the Ordering Information table; replaced all the Typical
Application Circuits, Functional Diagram, Pin Configuration, and Figures 1–4.
1
PAGES
CHANGED
DESCRIPTION
—
1–20
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.
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