Maxim MAXM15462AMB+ 4.5v to 42v, 300ma himalaya uslic step-down power module Datasheet

EVALUATION KIT AVAILABLE
MAXM15462
General Description
The Himalaya series of voltage regulator ICs and power
modules enable cooler, smaller, and simpler powersupply solutions. The MAXM15462 is a high-efficiency,
synchronous step-down DC-DC module with integrated
controller, MOSFETs, compensation components, and
inductor that operates over a wide input-voltage range.
The module operates from 4.5V to 42V input and delivers
up to 300mA output current over a programmable output
voltage from 0.9V to 5V. The module significantly reduces
design complexity, manufacturing risks, and offers a true
plug and play power/supply solution, reducing time-tomarket.
The MAXM15462 employs peak-current-mode control
architecture. To reduce input inrush current, the device
offers a fixed 4.1ms soft-start time.
The MAXM15462 module is available in a low profile, compact 10-pin, 2.6mm × 3mm × 1.5mm, uSLIC™ package.
Applications
●● Industrial Sensors and Encoders
●● 4-20mA Current-Loop Powered Sensors
●● LDO Replacement
●● HVAC and Building Control
●● Battery-Powered Equipment
4.5V to 42V, 300mA Himalaya uSLIC
Step-Down Power Module
Benefits and Features
● Easy to Use
• Wide 4.5V to 42V Input
• Adjustable 0.9V to 5V Output​
• ±1.44% Feedback Accuracy
• Up to 300mA Output-Current
• Internally Compensated
• All Ceramic Capacitors
● 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
​● Rugged
• Complies with CISPR22(EN55022) Class B
Conducted and Radiated Emissions
• Passes Drop, Shock, and Vibration Standards:
JESD22-B103, B104, B111
Typical Application Circuit
Ordering Information appears at end of data sheet.
VIN
VOUT
24V
5V,300mA
CIN
1µF
VIN
OUT
EN/UVLO
GND
MAXM15462
uSLIC is a trademark of Maxim Integrated Products, Inc.
C1
1µF
19-100177; Rev 2; 3/18
RESET
FB
VCC
LX
MODE
COUT
10µF R1
348kΩ
R2
75kΩ
MAXM15462
4.5V to 42V, 300mA Himalaya uSLIC
Step-Down Power Module
Absolute Maximum Ratings
VIN, EN/UVLO to GND.............................................-0.3V to 48V
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 = 24V, VGND = 0V, CVCC = 1μF, FB = 1V, 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
INPUT SUPPLY (VIN)
Input-Voltage Range
Input-Shutdown Current
Input-Supply Current
42
V
IIN-SH
VIN
VEN/UVLO = 0V, shutdown mode
4.5
2.2
4
μA
IQ-PFM
MODE = unconnected,
FB = 1.03 × VFB-REG
95
160
μA
IQ-PWM
Normal switching mode, VIN = 24V ,
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
www.maximintegrated.com
IEN/UVLO
VEN/UVLO falling, true shutdown
TA = +25°C
0.75
-100
Maxim Integrated │ 2
MAXM15462
4.5V to 42V, 300mA Himalaya uSLIC
Step-Down Power Module
Electrical Characteristics (continued)
(VIN = VEN/UVLO = 24V, VGND = 0V, CVCC = 1μF, FB = 1V, 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
4.75
5
5.25
V
13
30
50
mA
V
LDO (VCC)
VCC Output-Voltage Range
VCC Current Limit
VCC Dropout
VCC UVLO
VCC
IVCC-MAX
6V < VIN < 42V, 0mA < IVCC < 10mA
VCC = 4.3V
VCC-DO
VIN = 4.5V, IVCC = 5mA
0.15
0.3
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
V
SOFT-START (SS)
Soft-Start Time
tSS
ms
FEEDBACK (FB)
FB-Regulation Voltage
FB-Leakage Current
MODE = GND
0.887
0.9
0.913
MODE = unconnected
0.887
0.915
0.936
IFB
-100
-25
fSW
465
500
535
kHz
62.5
64.5
66.5
%
VFB-REG
V
nA
TIMING
Switching Frequency
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 95% Regulation
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
MAXM15462
4.5V to 42V, 300mA Himalaya uSLIC
Step-Down Power Module
Typical Operating Characteristics
(VIN = VEN/UVLO = 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. The circuit values for different output-voltage applications are as in Table 1, unless otherwise noted.)
EFFICIENCY vs. LOAD CURRENT
VOUT = 0.9V, PWM MODE
100
90
90
80
80
70
70
50
VIN = 4.5V
40
20
10
10
0
0
60
VIN = 12V
40
30
VIN = 12V
30
VIN = 4.5V
50
20
0
70
60
90 120 150 180 210 240 270 300
toc04
30
60
0
90 120 150 180 210 240 270 300
80
70
70
70
VIN = 5.5V
VIN = 12V
60
50
VIN = 12V
40
VIN = 24V
30
VIN = 36V
30
20
VIN = 42V
EFFICIENCY (%)
90
80
VIN = 24V
50
VIN = 36V
40
VIN = 42V
10
0
0
0
30
60
LOAD CURRENT (mA)
90 120 150 180 210 240 270 300
toc07
EFFICIENCY vs. LOAD CURRENT
VOUT = 2.5V, PFM MODE
100
toc08
VIN = 4.5V
80
70
70
VIN = 21.5V
VIN = 4.5V
60
50
40
20
10
10
0
0
10
LOAD CURRENT (mA)
www.maximintegrated.com
VIN = 24V
30
20
1
VIN = 36V
100
60
50
VIN = 36V VIN = 42V
40
VIN = 12V VIN = 24V
30
VIN = 12V
toc09
VIN = 5.5V
90
EFFICIENCY (%)
80
70
EFFICIENCY (%)
80
60
100
EFFICIENCY vs. LOAD CURRENT
VOUT = 3.3V, PFM MODE
100
90
30
10
LOAD CURRENT (mA)
90
VIN = 12V
1
LOAD CURRENT (mA)
EFFICIENCY vs. LOAD CURRENT
VOUT = 1.5V, PFM MODE
40
VIN = 12V
30
20
0
toc06
VIN = 4.5V
40
10
90 120 150 180 210 240 270 300
90 120 150 180 210 240 270 300
50
20
50
60
60
10
100
30
100
90
60
VIN = 36V
0
EFFICIENCY vs. LOAD CURRENT
VOUT = 0.9V , PFM MODE
toc05
80
30
VIN = 24V
LOAD CURRENT (mA)
90
0
VIN = 12V
40
20
EFFICIENCY vs. LOAD CURRENT
VOUT = 5V, PWM MODE
100
EFFICIENCY (%)
EFFICIENCY (%)
50
LOAD CURRENT (mA)
EFFICIENCY vs. LOAD CURRENT
VOUT = 3.3V, PWM MODE
60
VIN = 4.5V
60
10
0
toc03
30
VIN = 21.5V
LOAD CURRENT (mA)
100
EFFICIENCY (%)
60
EFFICIENCY vs. LOAD CURRENT
VOUT = 2.5V, PWM MODE
100
80
30
EFFICIENCY (%)
toc02
90
EFFICIENCY (%)
EFFICIENCY (%)
100
EFFICIENCY vs. LOAD CURRENT
VOUT = 1.5V, PWM MODE
toc01
20
10
1
10
LOAD CURRENT (mA)
100
0
1
10
100
LOAD CURRENT (mA)
Maxim Integrated │ 4
MAXM15462
4.5V to 42V, 300mA Himalaya uSLIC
Step-Down Power Module
Typical Operating Characteristics (continued)
(VIN = VEN/UVLO = 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. The circuit values for different output-voltage applications are as in Table 1, unless otherwise noted.)
EFFICIENCY vs. LOAD CURRENT
VOUT = 5V, PFM MODE
100
OUTPUT VOLTAGE vs. LOAD CURRENT
VOUT = 0.9V, PWM MODE
toc10
60
VIN = 36V
50
VIN = 42V
VIN = 24V
40
VIN = 12V
30
20
0.902
OUTPUT VOLTAGE (V)
70
OUTPUT VOLTAGE (V)
EFFICIENCY (%)
toc12
1.508
0.903
80
VIN = 12V
0.901
0.900
0.899
VIN = 4.5V
0.898
1
10
0.896
100
0
30
60
LOAD CURRENT (mA)
OUTPUT VOLTAGE vs. LOAD CURRENT
VOUT = 2.5V, PWM MODE
toc12
2.524
2.488
VIN = 12V
2.482
0
30
60
3.300
3.296
3.292
VIN = 42V
3.288
3.280
90 120 150 180 210 240 270 300
0
30
60
LOAD CURRENT (mA)
0
30
60
90 120 150 180 210 240 270 300
LOAD CURRENT (mA)
OUTPUT VOLTAGE vs. LOAD CURRENT
VOUT = 2.5V, PFM MODE
toc18
2.58
0.934
VIN = 12V
0.916
0.907
0.898
0.889
OUTPUT VOLTAGE (V)
1.54
VIN = 4.5V
0.925
OUTPUT VOLTAGE (V)
VIN = 42V
5.046
toc17
1.55
VIN = 36V
5.052
5.040
90 120 150 180 210 240 270 300
VIN = 24V
5.058
OUTPUT VOLTAGE vs. LOAD CURRENT
VOUT = 1.5V, PFM MODE
OUTPUT VOLTAGE vs. LOAD CURRENT
VOUT = 0.9V, PFM MODE
0.880
VIN = 36V
VIN = 12V
5.064
LOAD CURRENT (mA)
toc16
90 120 150 180 210 240 270 300
toc15
VIN = 24V
VIN = 21.5V
1.52
VIN = 12V
1.51
1.50
1.49
0
30
60
90 120 150 180 210 240 270 300
LOAD CURRENT (mA)
www.maximintegrated.com
1.48
VIN = 24V
2.56
VIN = 4.5V
1.53
OUTPUT VOLTAGE (V)
2.470
60
5.070
VIN = 12V
3.284
2.476
30
5.076
OUTPUT VOLTAGE (V)
2.494
0
OUTPUT VOLTAGE vs. LOAD CURRENT
VOUT = 5V, PWM MODE
VIN = 5.5V
2.500
VIN = 21.5V
OUTPUT VOLTAGE vs. LOAD CURRENT
VOUT = 3.3V, PWM MODE
toc14
OUTPUT VOLTAGE (V)
OUTPUT VOLTAGE (V)
2.506
1.492
LOAD CURRENT (mA)
3.304
VIN = 24V VIN = 4.5V
1.496
LOAD CURRENT (mA)
2.518
VIN = 36V
VIN = 12V
1.500
1.484
90 120 150 180 210 240 270 300
3.308
2.512
VIN = 4.5V
1.504
1.488
0.897
10
0
toc11
0.904
90
OUTPUT VOLTAGE vs. LOAD CURRENT
VOUT = 1.5V, PWM MODE
VIN = 36V
2.54
VIN = 4.5V VIN = 12V
2.52
2.50
2.48
2.46
0
30
60
90 120 150 180 210 240 270 300
LOAD CURRENT (mA)
2.44
0
30
60
90 120 150 180 210 240 270 300
LOAD CURRENT (mA)
Maxim Integrated │ 5
MAXM15462
4.5V to 42V, 300mA Himalaya uSLIC
Step-Down Power Module
Typical Operating Characteristics (continued)
(VIN = VEN/UVLO = 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. The circuit values for different output-voltage applications are as in Table 1, unless otherwise noted.)
OUTPUT VOLTAGE vs. LOAD CURRENT
VOUT = 3.3V, PFM MODE
OUTPUT VOLTAGE vs. LOAD CURRENT
VOUT = 5V, PFM MODE
toc19
3.390
5.18
VIN = 12V
5.16
VIN = 24V
3.350
OUTPUT VOLTAGE (V)
OUTPUT VOLTAGE (V)
3.370
VIN = 36V
3.330
VIN = 42V
3.310
3.290
3.270
VIN = 24V
5.14
5.12
5.10
VIN = 36V
5.08
0
30
60
90 120 150 180 210 240 270 300
5.04
10mV/div
VIN = 42V
5.00
0
LOAD CURRENT (mA)
30
60
90 120 150 180 210 240 270 300
2µs/div
LOAD CURRENT (mA)
OUTPUT-VOLTAGE RIPPLE
VIN = 24V, VOUT = 3.3V, FULL LOAD, PWM MODE
toc22
VOUT (AC)
VOUT (AC)
VIN = 12V
5.06
5.02
3.250
toc21
toc20
5.20
VIN = 4.5V
OUTPUT-VOLTAGE RIPPLE
VIN = 12V, VOUT = 1.5V, FULL LOAD, PWM MODE
10mV/div
OUTPUT-VOLTAGE RIPPLE
VIN = 24V, VOUT = 5V, FULL LOAD, PWM MODE
toc23
VOUT (AC)
10mV/div
INPUT-VOLTAGE RIPPLE,
VIN = 12V, VOUT = 1.5V, FULL LOAD, PWM MODE
toc24
2µs/div
2µs/div
INPUT-VOLTAGE RIPPLE
VIN = 24V, VOUT = 3.3V, FULL LOAD, PWM MODE
2µs/div
INPUT-VOLTAGE RIPPLE
VIN = 24V, VOUT = 5V, FULL LOAD, PWM MODE
toc25
100mV/div
VIN (AC)
toc26
LOAD TRANSIENT RESPONSE
VIN = 12V, VOUT = 1.5V, PFM MODE
(LOAD CURRENT STEPPED FROM 5mA to 150mA)
toc27
20mV/div
VOUT (AC)
100mV/div
VIN (AC)
100mV/div
VIN (AC)
100mA/div
IOUT
2µs/div
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2µs/div
100µs/div
Maxim Integrated │ 6
MAXM15462
4.5V to 42V, 300mA Himalaya uSLIC
Step-Down Power Module
Typical Operating Characteristics (continued)
(VIN = VEN/UVLO = 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. The circuit values for different output-voltage applications are as in Table 1, unless otherwise noted.)
LOAD TRANSIENT RESPONSE
VIN = 12V, VOUT = 1.5V, PWM MODE
(LOAD CURRENT STEPPED FROM 150mA TO 300mA)
toc28
LOAD TRANSIENT RESPONSE
VIN = 24V, VOUT = 3.3V, PFM MODE
(LOAD CURRENT STEPPED FROM 5mA TO 150mA)
toc29
20mV/div
VOUT (AC)
LOAD TRANSIENT RESPONSE
VIN = 24V, VOUT = 3.3V, PWM MODE
(LOAD CURRENT STEPPED FROM 150mA TO 300mA)
toc30
50mV/div
VOUT (AC)
100mV/div
VOUT (AC)
100mA/div
100mA/div
IOUT
IOUT
toc31
IOUT
100µs/div
100µs/div
LOAD TRANSIENT RESPONSE
VIN = 24V, VOUT = 5V, PWM MODE
(LOAD CURRENT STEPPED FROM 150mA TO 300mA)
STARTUP THROUGH ENABLE
VIN = 12V, VOUT = 1.5V, FULL LOAD, PWM MODE
100µs/div
LOAD TRANSIENT RESPONSE
VIN = 24V, VOUT = 5V, PFM MODE
(LOAD CURRENT STEPPED FROM 5mA TO 150mA)
100mA/div
toc33
toc32
5V/div
50mV/div
VOUT (AC)
EN/UVLO
100mV/div
VOUT (AC)
10V/div
1V/div
LX
5V/div
VOUT
IOUT
100mA/div
100mA/div
IOUT
100µs/div
RESET
1ms/div
100µs/div
SHUTDOWN THROUGH ENABLE
VIN = 12V, VOUT = 1.5V, FULL LOAD, PWM MODE
toc34
STARTUP THROUGH ENABLE
VIN = 24V, VOUT = 3.3V, FULL LOAD, PWM MODE
toc35
SHUTDOWN THROUGH ENABLE
VIN = 24V, VOUT = 3.3V, FULL LOAD, PWM MODE
toc36
5V/div
EN/UVLO
5V/div
LX
10V/div
EN/UVLO
1V/div
VOUT
RESET
5V/div
RESET
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20V/div
2V/div
LX
VOUT
100µs/div
EN/UVLO
5V/div
1ms/div
5V/div
LX
20V/div
VOUT
2V/div
RESET
5V/div
100µs/div
Maxim Integrated │ 7
MAXM15462
4.5V to 42V, 300mA Himalaya uSLIC
Step-Down Power Module
Typical Operating Characteristics (continued)
(VIN = VEN/UVLO = 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. The circuit values for different output-voltage applications are as in Table 1, unless otherwise noted.)
STARTUP THROUGH ENABLE (2V PREBIAS)
(VIN = 24V, VOUT = 3.3V, NO LOAD, PFM MODE)
STARTUP THROUGH ENABLE (2V PREBIAS)
VIN = 24V, VOUT = 3.3V, NO LOAD, PWM MODE
EN/UVLO
LX
20V/div
5V/div
20V/div
LX
5V/div
VOUT
toc40
5V/div
VOUT
RESET
1ms/div
1ms/div
SHUTDOWN THROUGH ENABLE
(VIN = 24V, VOUT = 5V, FULL LOAD, PWM MODE)
20V/div
2V/div
2V/div
RESET
RESET
5V/div
EN/UVLO
LX
2V/div
VOUT
toc39
5V/div
5V/div
EN/UVLO
STARTUP THROUGH ENABLE
VIN = 24V, VOUT = 5V, FULL LOAD, PWM MODE
toc38
toc37
1ms/div
STARTUP THROUGH VIN
VIN = 12V, VOUT = 1.5V, FULL LOAD, PWM MODE
SHUTDOWN THROUGH VIN
VIN = 12V, VOUT = 1.5V, FULL LOAD, PWM MODE
toc41
toc42
10V/div
EN/UVLO
5V/div
LX
20V/div
VIN
10V/div
LX
VIN
10V/div
LX
10V/div
2V/div
500mV/div
VOUT
2V/div
VCC
VCC
2V/div
RESET
5V/div
VOUT
VOUT
500mV/div
1ms/div
100µs/div
STARTUP THROUGH VIN
VIN = 24V, VOUT = 3.3V, FULL LOAD, PWM MODE
toc43
1ms/div
STARTUP THROUGH VIN
VIN = 24V, VOUT = 5V, FULL LOAD, PWM MODE
SHUTDOWN THROUGH VIN
VIN = 24V, VOUT = 3.3V, FULL LOAD, PWM MODE
toc45
toc44
20V/div
20V/div
VIN
LX
20V/div
VIN
20V/div
VIN
LX
20V/div
LX
20V/div
2V/div
2V/div
2V/div
2V/div
VCC
VCC
2V/div
VCC
VOUT
VOUT
2V/div
VOUT
1ms/div
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1ms/div
1ms/div
Maxim Integrated │ 8
MAXM15462
4.5V to 42V, 300mA Himalaya uSLIC
Step-Down Power Module
Typical Operating Characteristics (continued)
(VIN = VEN/UVLO = 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. The circuit values for different output-voltage applications are as in Table 1, unless otherwise noted.)
OUTPUT SHORT IN STEADY STATE
VIN = 24V, VOUT = 3.3V, FULL LOAD, PWM MODE
SHUTDOWN THROUGH VIN
VIN = 24V, VOUT = 5V, FULL LOAD, PWM MODE
toc46
OUTPUT SHORT DURING STARTUP
VIN = 24V, VOUT = 3.3V, FULL LOAD, PWM MODE
toc47
toc48
20V/div
5V/div
20V/div
LX
20V/div
SHORT
VIN
VOUT
2V/div
LX
VCC
2V/div
VOUT
2V/div
20V/div
200mA/div
IOUT
10mA/div
IOUT
20ms/div
20ms/div
BODE PLOT
(VIN = 12V, VOUT = 1.5V, FULL LOAD, MODE = PWM)
BODE PLOT
(VIN = 24V, VOUT = 3.3V, FULL LOAD, MODE = PWM)
60
60
toc49
80
90
0
GAIN
-30
GAIN (dB)
0
PHASE MARGIN (°)
30
20
-60
CROSSOVER FREQUENCY = 51.42kHz
PHASE MARGIN = 53.85◦
1k
0
0
GAIN
-30
CROSSOVER FREQUENCY = 45.732kHz
PHASE MARGIN = 56.3°
-60
-90
100k
10k
-80
1k
FREQUENCY (Hz)
BODE PLOT
VIN = 24V, VOUT = 5V, FULL LOAD, PWM MODE
PHASE
20
0
90
350
60
300
30
0
GAIN
-20
-30
-40
CROSSOVER FREQUENCY = 43.26kHz
PHASE MARGIN = 58.03°
-60
-80
1k
10k
FREQUENCY (Hz)
www.maximintegrated.com
-60
-90
100k
OUTOPUT CURRENT (mA)
40
OUTPUT CURRENT
vs. AMBIENT TEMPERATURE
PHASE MARGIN (°)
toc51
60
-60
-90
100k
10k
FREQUENCY (Hz)
80
30
20
-40
-60
-80
PHASE
-20
-40
90
60
40
PHASE
-20
toc50
80
60
40
GAIN (dB)
20V/div
LX
1ms/div
GAIN (dB)
20mV/div
VOUT
PHASE MARGIN (°)
VIN
250
toc52
VOUT = 2.5V
200
VOUT = 3.3V
150
100
VOUT = 5V
50
0
50
70
90
110
130
AMBIENT TEMPERATURE (°C)
Maxim Integrated │ 9
MAXM15462
4.5V to 42V, 300mA Himalaya uSLIC
Step-Down Power Module
Pin Configuration
TOP VIEW
+
10
VIN
9
VIN
3
8
EN/UVLO
MODE
4
7
VCC
OUT
5
6
FB
LX
1
GND
2
RESET
MAXM15462
‘+’ INDICATES PIN 1 OF THE MODULE
Pin Description
PIN
NAME
1
LX
2
GND
Ground Pin. Connect GND to the ground plane. See the PCB Layout Guidelines section for more details.
Refer to the MAXM15462 EV kit for a sample layout.
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
Module Output Pin. Connect a capacitor from OUT to GND. See the PCB Layout Guidelines section for
more details.
6
FB
Output Feedback Connection. Connect FB to a resistor-divider between OUT and GND to set the output
voltage.
7
VCC
8
EN/UVLO
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.
9–10
VIN
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.
www.maximintegrated.com
FUNCTION
Switching Node of the Inductor. No external connection to this pin.
Internal LDO Power Output. Bypass VCC to GND with a minimum 1µF ceramic capacitor.
Maxim Integrated │ 10
MAXM15462
4.5V to 42V, 300mA Himalaya uSLIC
Step-Down Power Module
Functional Diagrams
Internal Diagram
MAXM15462
VCC
VIN
LDO
HIGH-SIDE
DRIVER
LX
+
EN/UVLO
-
33µH
1.215V
OUT
OSCILLATOR
PEAK
CURRENT-MODE
CONTROLLER
LOW-SIDE
DRIVER
SOFT-START
MODE
FB
www.maximintegrated.com
MODE
SELECTION
LOGIC
GND
SLOPE
COMPENSATION
RESET
LOGIC
RESET
Maxim Integrated │ 11
MAXM15462
Detailed Description
The MAXM15462 module is a high-voltage, syn­chronous
step-down DC-DC module with integrated MOSFETs and
inductor, that operates over a wide 4.5V to 42V inputvoltage range. The module delivers an output current up to
300mA over a programmable output-voltage range of 0.9V
to 5V. 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 module uses an internally compensated, fixed-fre­
quency, 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
operation at all loads. However, PWM-mode of operation
www.maximintegrated.com
4.5V to 42V, 300mA Himalaya uSLIC
Step-Down Power Module
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 │ 12
MAXM15462
4.5V to 42V, 300mA Himalaya uSLIC
Step-Down Power Module
RESET Output (RESET)
The device includes an open-drain RESET output to
monitor the output voltage. RESET goes high impedance
2ms after the output rises above 95.5% 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.
Startup into a Prebiased Output
=
VIN(MIN)
VOUT + (I OUT × 3.05)
+ (I OUT × 1.8)
D MAX
VIN(MAX) =
VOUT
t ON(MIN) × f SW
The device is 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.
where:
Overcurrent Protection (OCP)/Hiccup Mode
DMAX = Maximum duty cycle (0.89),
The device is provided with a robust overcurrent protection (OCP) scheme that protects the device under overload and output short-circuit conditions. When the device
detects either overcurrent, 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
converter 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 short-circuit conditions. The device exits Hiccup
mode, if the overcurrent condition is removed or, if input
power or EN/UVLO is cycled.
Thermal Overload Protection
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.
Applications Information
Input-Voltage Range
The minimum and maximum operating input voltages for
a given output voltage should be calculated as follows:
www.maximintegrated.com
VOUT = Steady-state output voltage,
IOUT = Maximum load current,
fSW = Worst-case switching frequency(535000 Hz),
tON(MIN) = Worst-case minimum controllable switch ontime (130ns).
Also, for duty cycle > 0.5;
VIN(MIN) > ((4.27 × VOUT) − 9.76)
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
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 tem-
Maxim Integrated │ 13
MAXM15462
4.5V to 42V, 300mA Himalaya uSLIC
Step-Down Power Module
perature stability. Calculate the input capacitance using
the following equation:
I OUT(MAX) × D MAX × (1 − D MAX )
C IN =
f SW × ∆VIN
where:
DMAX = Maximum duty cycle(0.89),
fSW = Switching frequency,
ΔVIN = 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 MAXM15462 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


OUT
VIN
R1
MAXM15462
EN/UVLO
MAXM15462
R3
FB
R4
R2
Figure 1. Adjustable EN/UVLO Network
www.maximintegrated.com
Figure 2. Setting the Output Voltage
Maxim Integrated │ 14
MAXM15462
4.5V to 42V, 300mA Himalaya uSLIC
Step-Down Power Module
Table 1. Selection of Components
V IN(MIN) V IN(MAX) V OUT*
(V)
(V)
(V)
C IN
R3
(kΩ)
C OUT
R4
(kΩ)
I AVG_LIMIT
(A)
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
0.53
4.5
17
1.2
1 x 1µF 0805 25V
1 x 47µF 1210 6.3V
(Murata GR219R71E105KA88D) (Murata GRM32ER70J476KE20L)
25
75
0.52
4.5
21.5
1.5
1 x 1µF 0805 25V
1 x 22µF 1206 6.3V
(Murata GR219R71E105KA88D) (Murata GRM31CR70J226KE19L)
50
75
0.51
4.5
25.5
1.8
1 x 1µF 0805 50V
1 x 22µF 1206 6.3V
(Murata GRM21BR71105KA12L) (Murata GRM31CR70J226KE19L)
75
75
0.50
4.5
36
2.5
1 x 1µF 0805 50V
1 x 22µF 1206 6.3V
(Murata GRM21BR71105KA12L) (Murata GRM31CR70J226KE19L)
133
75
0.48
5.5
42
3.3
1 x 1µF 0805 50V
1 x 10µF 1206 6.3V
(Murata GRM21BR71105KA12L) (Murata GRM31CR70J106KA01L)
200
75
0.46
12
42
5
1 x 1µF 0805 50V
1 x 10µF 1206 6.3V
(Murata GRM21BR71105KA12L) (Murata GRM31CR70J106KA01L)
348
75
0.42
SHORT OPEN
0.53
* The MAXM15462 has a pulse skip algorithm that allows VOUT to be regulated beyond the VIN(MAX) specified in the above table, up to 42V.
Power Dissipation
The device output current needs to be derated if the
device needs to operate in high ambient temperature.
The derating curves given in the Typical Operating
Characteristics section can be used as a guide.
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.
www.maximintegrated.com
Maxim Integrated │ 15
MAXM15462
4.5V to 42V, 300mA Himalaya uSLIC
Step-Down Power Module
VIN
VOUT
OUT
VIN
CIN
COUT
MAXM15462
R1
R3
RESET
R2
EN/UVLO
FB
VCC
LX
CVCC
GND
R4
MODE
CIN
GND PLANE
VIN PLANE
+
LX
1
GND
10
VIN
2
9
VIN
RESET
3
8
EN/UVLO
MODE
4
7
VCC
5
6
MAXM15462
R1
COUT
OUT
R2
CVCC
FB
VOUT PLANE
R3
R4
GND PLANE
Figure 3. Layout Guidelines
www.maximintegrated.com
Maxim Integrated │ 16
MAXM15462
4.5V to 42V, 300mA Himalaya uSLIC
Step-Down Power Module
Typical Application Circuits
Typical Application circuit for 3.3V Output
5.5V TO 42V
C1
1µF
VIN
OUT
EN/UVLO
GND
3.3V,300mA
C2
10µF
MAXM15462
RESET
FB
VCC
LX
C3
1µF
R1
200kΩ
R2
75kΩ
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)
Typical Application circuit for 5V output
12V TO 42V
C1
1µF
VIN
OUT
EN/UVLO
GND
MAXM15462
RESET
FB
VCC
LX
C3
1µF
MODE
5V,300mA
C2
10µF
R1
348kΩ
R2
75kΩ
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)
www.maximintegrated.com
Maxim Integrated │ 17
MAXM15462
4.5V to 42V, 300mA Himalaya uSLIC
Step-Down Power Module
Typical Application circuit for 1.5V output
4.5V TO 21.5V
C1
1µF
VIN
OUT
EN/UVLO
GND
MAXM15462
RESET
FB
VCC
LX
C3
1µF
MODE
1.5V,300mA
C2
22µF
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)
Ordering Information
PART
NUMBER
TEMP
RANGE
PIN-PACKAGE
MAXM15462AMB+
-40°C to +125°C
10-pin uSLIC
MAXM15462AMB+T
-40°C to +125°C
10-pin uSLIC
+ Denotes a lead(Pb)-free/RoHS-compliant package.
T Denotes tape-and-reel.
www.maximintegrated.com
Maxim Integrated │ 18
MAXM15462
4.5V to 42V, 300mA Himalaya uSLIC
Step-Down Power Module
Revision History
REVISION
NUMBER
REVISION
DATE
0
10/17
0.1
PAGES
CHANGED
DESCRIPTION
Initial release
—
Added trademark information for uSLIC
1–2, 18
1
3/18
Updated General Description, Benefits and Features, Applications, Typical Application
Circuit, and Absolute Maximum Ratings sections
2
3/18
Updated General Description section.
1, 2
1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim Integrated’s website at www.maximintegrated.com.
Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent licenses
are implied. Maxim Integrated reserves the right to change the circuitry and specifications without notice at any time. The parametric values (min and max limits)
shown in the Electrical Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance.
Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc.
© 2018 Maxim Integrated Products, Inc. │ 19