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MAXM15462/MAXM15463/
MAXM15464
4.5V to 42V, 300mA Himalaya uSLIC
Step-Down Power Module
General Description
The Himalaya series of voltage regulator ICs and power
modules enable cooler, smaller, and simpler power-supply
solutions. The MAXM15462/MAXM15463/MAXM15464
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 42V input and deliver up to 300mA
output current. The MAXM15463 and MAXM15464 are
fixed 3.3V and 5V output modules respectively. The
MAXM15462 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.
The MAXM15462/3/4 modules employ peak-currentmode control architecture. To reduce input inrush current,
the modules offer a fixed 4.1ms soft-start time.
The MAXM15462/3/4 modules are available in a low profile, compact 10-pin, 2.6mm × 3mm × 1.5mm, uSLIC™
package.
Applications
Benefits and Features
● Easy to Use
• Wide 4.5V to 42V Input
• Adjustable 0.9V to 5V Output
• Fixed 3.3V and 5V Output (MAXM15463 and
MAXM15464)
• ±1.5% 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
●● Industrial Sensors and Encoders
●● 4-20mA Current-Loop Powered Sensors
●● LDO Replacement
●● HVAC and Building Control
●● Battery-Powered Equipment
Ordering Information appears at end of data sheet.
uSLIC is a trademark of Maxim Integrated Products, Inc.
Typical Application Circuit 2.5V
VIN
24V
OUT
VIN
CIN
R1
1µF 2.2MΩ
RESET
GND
Typical Application Circuit 5V
VOUT
2.5V, 300mA
COUT
10µF
VIN
24V
CIN
R3
133kΩ
EN/UVLO
1µF
R2
825kΩ
C1
1µF
19-100177; Rev 4; 8/18
FB
VCC
LX
MODE
R4
75kΩ
GND
MAXM15464
MAXM15462
EN/UVLO
OUT
VIN
C1
1µF
RESET
FB
VCC
LX
MODE
VOUT
5V, 300mA
COUT
10µF
MAXM15462/MAXM15463/
MAXM15464
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 (MAXM15462), FB = 3.6V (MAXM15463) FB = 5.5V (MAXM15464), 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
IEN/UVLO
VEN/UVLO falling, true shutdown
0.75
TA = +25°C
-100
6V < VIN < 42V, 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
MAXM15462/MAXM15463/
MAXM15464
4.5V to 42V, 300mA Himalaya uSLIC
Step-Down Power Module
Electrical Characteristics (continued)
(VIN = VEN/UVLO = 24V, VGND = 0V, CVCC = 1μF, FB = 1V (MAXM15462), FB = 3.6V (MAXM15463) FB = 5.5V (MAXM15464), 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
V
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
VFB-REG
IFB
MODE = GND, MAXM15462
0.887
0.90
0.913
MODE = unconnected, MAXM15462
0.887
0.915
0.936
MODE = GND, MAXM15463
3.25
3.30
3.35
MODE = unconnected, MAXM15463
3.25
3.35
3.42
MODE = GND, MAXM15464
4.93
5.00
5.07
MODE = unconnected, MAXM15464
4.93
5.08
5.18
MAXM15462
-100
-25
465
500
535
kHz
62.5
64.5
66.5
%
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
MAXM15462/MAXM15463/
MAXM15464
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.)
toc01
100
MAXM15462
EFFICIENCY vs. LOAD CURRENT
ADJUSTABLE VOUT = 1.5V, PWM MODE
toc02
90
80
80
80
70
70
60
50
VIN = 5V
40
30
VIN = 12V
60
VIN = 5V
50
VIN = 12V
40
30
VIN = 20V
20
50
30
0
0
100
30 60 90 120 150 180 210 240 270 300
toc04
MAXM15462
EFFICIENCY vs. LOAD CURRENT
ADJUSTABLE VOUT = 5V, PWM MODE
toc05
100
80
70
70
VIN = 12V
40
VIN = 24V
30
VIN = 36V
EFFICIENCY (%)
80
EFFICIENCY (%)
90
80
60
VIN = 12V
VIN = 24V
50
VIN = 36V
40
30
70
60
VIN = 5.5V
50
VIN = 12V
20
10
10
10
0
0
0
0
LOAD CURRENT (mA)
30 60 90 120 150 180 210 240 270 300
MAXM15462
EFFICIENCY vs. LOAD CURRENT
ADJUSTABLE VOUT = 0.9V, PFM MODE
toc08
100
80
70
70
70
VIN = 24V
50
VIN = 36V
40
30
50
40
VIN = 5V
30
VIN = 12V
EFFICIENCY (%)
90
80
EFFICIENCY (%)
90
60
50
40
20
10
10
10
0
0
LOAD CURRENT (mA)
www.maximintegrated.com
0
1
10
100
LOAD CURRENT (mA)
VIN = 5V
30
20
30 60 90 120 150 180 210 240 270 300
toc09
60
20
0
MAXM15462
EFFICIENCY vs. LOAD CURRENT
ADJUSTABLE VOUT = 1.5V, PFM MODE
100
80
VIN = 12V
30 60 90 120 150 180 210 240 270 300
LOAD CURRENT (mA)
90
60
0
LOAD CURRENT(mA)
MAXM15464
EFFICIENCY vs. LOAD CURRENT
FIXED VOUT = 5V, PWM MODE toc07
100
VIN = 36V
30
20
30 60 90 120 150 180 210 240 270 300
VIN = 24V
40
20
0
30 60 90 120 150 180 210 240 270 300
MAXM15463
EFFICIENCY vs. LOAD CURRENT
FIXED VOUT = 3.3V, PWM MODE toc06
100
90
50
0
LOAD CURRENT (mA)
90
VIN = 5.5V
VIN = 36V
LOAD CURRENT (mA)
MAXM15462
EFFICIENCY vs. LOAD CURRENT
ADJUSTABLE VOUT = 3.3V, PWM MODE
60
VIN = 24V
20
10
0
VIN = 12V
40
10
30 60 90 120 150 180 210 240 270 300
VIN = 5V
60
0
0
MAXM15462
EFFICIENCY vs. LOAD CURRENT
ADJUSTABLE VOUT = 2.5V, PWM MODE
toc03
70
10
LOAD CURRENT (mA)
EFFICIENCY (%)
EFFICIENCY (%)
90
20
EFFICIENCY (%)
100
90
EFFICIENCY (%)
EFFICIENCY (%)
100
MAXM15462
EFFICIENCY vs. LOAD CURRENT
ADJUSTABLE VOUT = 0.9V, PWM MODE
1
10
VIN = 12V
VIN = 20V
100
LOAD CURRENT (mA)
Maxim Integrated │ 4
MAXM15462/MAXM15463/
MAXM15464
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.)
MAXM15462
EFFICIENCY vs. LOAD CURRENT
ADJUSTABLE VOUT = 2.5V, PFM MODE
toc10
100
toc11
80
70
70
VIN = 36V
40
VIN = 24V
30
VIN = 12V
60
50
VIN = 36V
40
VIN = 12V VIN = 24V
30
50
20
10
0
0
10
100
1
10
MAXM15463
EFFICIENCY vs. LOAD CURRENT
FIXED VOUT = 3.3V, PFM MODE
toc13
100
VIN = 5.5V
90
70
70
EFFICIENCY (%)
80
60
50
VIN = 36V
30
VIN = 12V
VIN = 24V
1
VIN = 36V
VIN = 12V
30
10
10
0
100
toc16
1
10
toc18
3.308
3.304
VIN = 20V
1.488
VIN = 36V VIN = 24V VIN = 5V
2.506
2.500
2.494
2.488
VIN = 12V
2.482
2.470
www.maximintegrated.com
VIN = 5.5V
3.300
VIN = 12V
VIN =24V
3.296
3.292
3.288
VIN = 36V
3.284
2.476
30 60 90 120 150 180 210 240 270 300
OUTPUT VOLTAGE (V)
1.496
OUTPUT VOLTAGE (V)
VIN = 12V
30 60 90 120 150 180 210 240 270 300
MAXM15462
OUTPUT VOLTAGE vs. LOAD CURRENT
ADJUSTABLE VOUT = 3.3V, PWM MODE
toc17
2.512
LOAD CURRENT (mA)
0
LOAD CURRENT (mA)
2.518
0
VIN = 5V
0.898
0.896
100
2.524
VIN = 5V
1.492
0.899
MAXM15462
OUTPUT VOLTAGE vs. LOAD CURRENT
ADJUSTABLE VOUT = 2.5V, PWM MODE
1.508
1.500
0.900
LOAD CURRENT (mA)
MAXM15462
OUTPUT VOLTAGE vs. LOAD CURRENT
ADJUSTABLE VOUT = 1.5V, PWM MODE
1.484
VIN = 24V
0.901
0.897
LOAD CURRENT (mA)
1.504
VIN = 12V
0.902
40
20
toc15
0.903
50
10
100
MAXM15462
OUTPUT VOLTAGE vs. LOAD CURRENT
ADJUSTABLE VOUT = 0.9V, PWM MODE
0.904
toc14
60
20
0
10
LOAD CURRENT (mA)
90
80
40
MAXM15464
EFFICIENCY vs. LOAD CURRENT
FIXED VOUT = 5V, PFM MODE
VIN = 24V
1
LOAD CURRENT (mA)
OUTPUT VOLTAGE (V)
100
0
100
VIN = 12V
30
10
1
VIN = 36V
40
10
LOAD CURRENT (mA)
EFFICIENCY (%)
60
20
20
OUTPUT VOLTAGE (V)
EFFICIENCY (%)
80
70
50
toc12
90
80
60
MAXM15462
EFFICIENCY vs. LOAD CURRENT
ADJUSTABLE VOUT = 5V, PFM MODE
100
VIN = 5.5V
90
EFFICIENCY (%)
EFFICIENCY (%)
100
VIN = 5V
90
MAXM15462
EFFICIENCY vs. LOAD CURRENT
ADJUSTABLE VOUT = 3.3V, PFM MODE
0
30 60 90 120 150 180 210 240 270 300
LOAD CURRENT (mA)
3.280
0
30 60 90 120 150 180 210 240 270 300
LOAD CURRENT (mA)
Maxim Integrated │ 5
MAXM15462/MAXM15463/
MAXM15464
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.)
3.310
VIN = 24V VIN = 36V
VIN = 12V
5.064
5.058
5.052
VIN = 36V
3.306
3.304
VIN = 12V
3.300
0
30 60 90 120 150 180 210 240 270 300
toc22
1.55
0
30
5.000
60
4.998
90 120 150 180 210 240 270 300
VIN = 24V
VIN = 12V
VIN = 36V
0
30
60
90 120 150 180 210 240 270 300
LOAD CURRENT (mA)
MAXM15462
OUTPUT VOLTAGE vs. LOAD CURRENT
ADJUSTABLE VOUT = 1.5V, PFM MODE
MAXM15462
OUTPUT VOLTAGE vs. LOAD CURRENT
ADJUSTABLE VOUT = 2.5V, PFM MODE
toc23
1.54
toc24
VIN = 12V
0.916
0.907
0.898
0.889
VIN = 5V
1.53
OUTPUT VOLTAGE (V)
VIN = 5V
0.925
OUTPUT VOLTAGE (V)
OUTPUT VOLTAGE (V)
5.001
2.58
0.934
VIN = 20V
1.52
VIN = 12V
1.51
1.50
1.49
1.48
0
30 60 90 120 150 180 210 240 270 300
MAXM15462
OUTPUT VOLTAGE vs. LOAD CURRENT
ADJUSTABLE VOUT = 3.3V, PFM MODE
toc25
3.39
0
VIN = 24V
3.35
VIN = 36V
3.33
3.31
3.29
LOAD CURRENT (mA)
www.maximintegrated.com
2.48
0
30 60 90 120 150 180 210 240 270 300
MAXM15463
OUTPUT VOLTAGE vs. LOAD CURRENT
FIXED VOUT = 3.3V, PFM MODE toc27
toc26
3.39
5.16
5.12
5.10
VIN = 36V
5.08
VIN = 5.5V
VIN = 36V
3.37
VIN = 24V
5.14
VIN = 12V
5.06
5.00
30 60 90 120 150 180 210 240 270 300
2.50
MAXM1562
OUTPUT VOLTAGE vs. LOAD CURRENT
ADJUSTABLE VOUT = 5V, PFM MODE
3.35
3.33
VIN = 12V
3.31
3.29
VIN = 24V
3.27
5.02
0
VIN = 12V
LOAD CURRENT (mA)
5.04
3.27
VIN = 5V
2.52
LOAD CURRENT (mA)
5.18
OUTPUT VOLTAGE (V)
VIN = 12V
3.37
VIN = 36V
2.54
2.44
30 60 90 120 150 180 210 240 270 300
5.20
VIN = 5.5V
VIN = 24V
2.56
2.46
LOAD CURRENT (mA)
3.25
5.002
LOAD CURRENT (mA)
MAXM5462
OUTPUT VOLTAGE vs. LOAD CURRENT
ADJUSTABLE VOUT = 0.9V, PFM MODE
OUTPUT VOLTAGE (V)
VIN = 24V
5.003
4.999
LOAD CURRENT (mA)
0.880
VIN = 5.5V
3.302
5.046
5.040
toc21
5.004
3.308
OUTPUT VOLTAGE (V)
OUTPUT VOLTAGE (V)
5.070
MAXM15464
OUTPUT VOLTAGE vs. LOAD CURRENT
FIXED VOUT = 5V, PWM MODE
5.005
OUTPUT VOLTAGE (V)
toc19
MAXM15463
OUTPUT VOLTAGE vs. LOAD CURRENT
FIXED VOUT = 3.3V, PWM MODE toc20
OUTPUT VOLTAGE (V)
5.076
MAXM15462
OUTPUT VOLTAGE vs. LOAD CURRENT
ADJUSTABLE VOUT = 5V, PWM MODE
3.25
0
30 60 90 120 150 180 210 240 270 300
LOAD CURRENT (mA)
0
30
60
90 120 150 180 210 240 270 300
LOAD CURRENT (mA)
Maxim Integrated │ 6
MAXM15462/MAXM15463/
MAXM15464
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 (V)
5.110
MAXM15462 OUTPUT VOLTAGE RIPPLE
VIN = 24V, ADJUSTABLE VOUT = 3.3V,
FULL LOAD, PWM MODE
MAXM15462 OUTPUT VOLTAGE RIPPLE
VIN = 12V, ADJUSTABLE VOUT = 1.5V,
FULL LOAD, PWM MODE
MAXM15464
OUTPUT VOLTAGE vs. LOAD CURRENT
FIXED VOUT = 5V, PFM MODE toc28
toc29
toc30
VIN = 12V
5.085
VIN = 24V
5.060
VOUT (AC)
VIN = 36V
5.035
10mV/div
VOUT (AC)
10mV/div
5.010
4.985
4.960
0
30
60
90 120 150 180 210 240 270 300
MAXM15462 OUTPUT VOLTAGE RIPPLE
VIN = 24V, ADJUSTABLE VOUT = 5V,
FULL LOAD, PWM MODE
toc31
VOUT (AC)
10mV/div
MAXM15463
OUTPUT VOLTAGE RIPPLE
VIN = 24V, FIXED VOUT = 3.3V, FULL LOAD, PWM MODE
toc32
VOUT (AC)
toc34
100mV/div
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toc33
VOUT (AC)
10mV/div
2µs/div
MAXM15462 INPUT VOLTAGE RIPPLE
VIN = 24V, ADJUSTABLE VOUT = 5V,
FULL LOAD, PWM MODE
MAXM15462 INPUT VOLTAGE RIPPLE
VIN = 24V, ADJUSTABLE VOUT = 3.3V,
FULL LOAD, PWM MODE
MAXM15462 INPUT VOLTAGE RIPPLE
VIN = 12V, ADJUSTABLE VOUT = 1.5V,
FULL LOAD, PWM MODE
2µs/div
10mV/div
MAXM15464
OUTPUT VOLTAGE RIPPLE
VIN = 24V, FIXED VOUT = 5V, FULL LOAD, PWM MODE
2µs/div
2µs/div
VIN (AC)
2µs/div
2µs/div
LOAD CURRENT (mA)
toc36
toc35
VIN (AC)
100mV/div
2µs/div
VIN (AC)
100mV/div
2µs/div
Maxim Integrated │ 7
MAXM15462/MAXM15463/
MAXM15464
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.)
MAXM15463 INPUT VOLTAGE RIPPLE
VIN = 24V,FIXED VOUT = 3.3V, FULL LOAD, PWM MODE
toc37
MAXM15464
INPUT VOLTAGE RIPPLE
VIN = 24V, FIXED VOUT = 5V, FULL LOAD, PWM MODE
toc38
MAXM15462 LOAD TRANSIENT RESPONSE
VIN = 12V, ADJUSTABLE VOUT = 1.5V, PFM MODE
(LOAD CURRENT STEPPED FROM 5mA TO 150mA)
toc39
VOUT (AC)
VIN (AC)
100mV/div
VIN (AC)
20mV/div
100mV/div
100mA/div
IOUT
2µs/div
2µs/div
MAXM15462 LOAD TRANSIENT RESPONSE
VIN = 12V, ADJUSTABLE VOUT = 1.5V, PWM MODE
(LOAD CURRENT STEPPED FROM 150mA TO 300mA)
100µs/div
MAXM15462 LOAD TRANSIENT RESPONSE
VIN = 24V,ADJUSTABLE VOUT = 3.3V, PFM MODE
(LOAD CURRENT STEPPED FROM 5mA TO 150mA)
toc41
toc40
20mV/div
VOUT (AC)
MAXM15462 LOAD TRANSIENT RESPONSE
VIN = 24V,ADJUSTABLE VOUT = 3.3V, PWM MODE
(LOAD CURRENT STEPPED FROM 150mA TO 300mA)
toc42
50mV/div
VOUT (AC)
100mV/div
VOUT (AC)
100mA/div
100mA/div
IOUT
IOUT
100µs/div
100mA/div
MAXM15462 LOAD TRANSIENT RESPONSE
VIN = 24V, ADJUSTABLE VOUT = 5V, PWM MODE
(LOAD CURRENT STEPPED FROM 150mA TO 300mA)
toc44
toc43
VOUT (AC)
100mV/div
IOUT
100mA/div
MAXM15463 LOAD TRANSIENT RESPONSE
VIN = 24V,FIXED VOUT = 3.3V, PFM MODE
(LOAD CURRENT STEPPED FROM 5mA TO 150mA)
toc45
50mV/div
VOUT (AC)
www.maximintegrated.com
100µs/div
100µs/div
MAXM15462 LOAD TRANSIENT RESPONSE
VIN = 24V, ADJUSTABLE VOUT = 5V, PFM MODE
(LOAD CURRENT STEPPED FROM 5mA TO 150mA)
100µs/div
IOUT
VOUT (AC)
100mA/div
IOUT
100µs/div
100mV/div
IOUT
100mA/div
100µs/div
Maxim Integrated │ 8
MAXM15462/MAXM15463/
MAXM15464
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.)
MAXM15463 LOAD TRANSIENT RESPONSE
VIN = 24V, FIXED VOUT = 3.3V, PWM MODE
(LOAD CURRENT STEPPED FROM 150mA TO 300mA)
MAXM15464 LOAD TRANSIENT RESPONSE
VIN = 24V, FIXED VOUT = 5V, PFM MODE
(LOAD CURRENT STEPPED FROM 5mA TO 150mA)
toc47
toc46
toc48
50mV/div
VOUT (AC)
50mV/div
VOUT (AC)
MAXM15464 LOAD TRANSIENT RESPONSE
VIN = 24V, FIXED VOUT = 5V, PWM MODE
(LOAD CURRENT STEPPED FROM 150mA TO 300mA)
100mV/div
VOUT (AC)
100mA/div
100mA/div
IOUT
IOUT
toc49
IOUT
100µs/div
100µs/div
MAXM15462 SHUTDOWN THROUGH ENABLE
VIN = 12V, ADJUSTABLE VOUT = 1.5V,
FULL LOAD, PWM MODE
MAXM15462 STARTUP THROUGH ENABLE
VIN = 24V, ADJUSTABLE VOUT = 3.3V,
FULL LOAD, PWM MODE
100µs/div
MAXM15462 STARTUP THROUGH ENABLE
VIN = 12V, ADJUSTABLE VOUT = 1.5V,
FULL LOAD, PWM MODE
100mA/div
toc50
toc51
5V/div
5V/div
EN/UVLO
5V/div
EN/UVLO
10V/div
1V/div
LX
5V/div
VOUT
RESET
EN/UVLO
10V/div
VOUT
1V/div
VOUT
RESET
5V/div
RESET
1ms/div
MAXM15462 STARTUP THROUGH ENABLE
2V PREBIAS, VIN = 24V, ADJUSTABLE VOUT = 3.3V,
NO LOAD, PWM MODE
toc53
toc52
5V/div
1ms/div
100µs/div
MAXM15462 SHUTDOWN THROUGH ENABLE
VIN = 24V, ADJUSTABLE VOUT = 3.3V,
FULL LOAD, PWM MODE
20V/div
2V/div
LX
LX
MAXM15462 STARTUP THROUGH ENABLE
(2V PREBIAS) VIN = 24V, ADJUSTABLE VOUT = 3.3V,
NO LOAD, PFM MODE
toc54
5V/div
5V/div
EN/UVLO
5V/div
EN/UVLO
EN/UVLO
LX
LX
20V/div
20V/div
2V/div
VOUT
RESET
5V/div
RESET
www.maximintegrated.com
20V/div
2V/div
2V/div
VOUT
100µs/div
LX
5V/div
5V/div
VOUT
RESET
1ms/div
1ms/div
Maxim Integrated │ 9
MAXM15462/MAXM15463/
MAXM15464
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.)
MAXM15462 STARTUP THROUGH ENABLE
VIN = 24V,ADJUSTABLE VOUT = 5V,
FULL LOAD, PWM MODE
toc55
MAXM15462 SHUTDOWN THROUGH ENABLE
VIN = 24V, ADJUSTABLE VOUT = 5V,
FULL LOAD, PWM MODE
MAXM15463 STARTUP THROUGH ENABLE
VIN = 24V,FIXED VOUT = 3.3V, FULL LOAD, PWM MODE
toc57
toc56
5V/div
5V/div
EN/UVLO
EN/UVLO
20V/div
2V/div
LX
5V/div
20V/div
LX
EN/UVLO
20V/div
LX
2V/div
5V/div
VOUT
RESET
VOUT
2V/div
RESET
5V/div
1ms/div
RESET
1ms/div
100µs/div
MAXM15463 SHUTDOWN THROUGH ENABLE
VIN = 24V,FIXED VOUT = 3.3V, FULL LOAD, PWM MODE
MAXM15463 STARTUP THROUGH ENABLE (2V PREBIAS)
VIN = 24V,FIXED VOUT = 3.3V, NO LOAD, PWM MODE
toc59
toc58
5V/div
VOUT
MAXM15463 STARTUP THROUGH ENABLE (2V PREBIAS)
VIN = 24V, FIXED VOUT = 3.3V, NO LOAD, PFM MODE
toc60
5V/div
EN/UVLO
5V/div
LX
20V/div
EN/UVLO
5V/div
EN/UVLO
LX
20V/div
LX
20V/div
2V/div
2V/div
VOUT
RESET
2V/div
VOUT
5V/div
RESET
5V/div
VOUT
RESET
1ms/div
1ms/div
MAXM15464 SHUTDOWN THROUGH ENABLE
VIN = 24V, FIXED VOUT = 5V, FULL LOAD, PWM MODE
MAXM15464 STARTUP THROUGH ENABLE (2.5V PREBIAS)
VIN = 24V, FIXED VOUT = 5V, NO LOAD, PWM MODE
100µs/div
MAXM15464 STARTUP THROUGH ENABLE
VIN = 24V, FIXED VOUT = 5V, FULL LOAD, PWM MODE
5V/div
toc62
toc61
toc63
5V/div
5V/div
EN/UVLO
EN/UVLO
20V/div
2V/div
LX
5V/div
VOUT
RESET
1ms/div
www.maximintegrated.com
5V/div
LX
20V/div
EN/UVLO
LX
VOUT
2V/div
VOUT
RESET
5V/div
RESET
100µs/div
20V/div
2V/div
5V/div
1ms/div
Maxim Integrated │ 10
MAXM15462/MAXM15463/
MAXM15464
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.)
MAXM15462 STARTUP THROUGH VIN
VIN = 12V, ADJUSTABLE VOUT = 1.5V,
FULL LOAD, PWM MODE
MAXM15464 STARTUP THROUGH ENABLE (2.5V PREBIAS)
VIN = 24V, FIXED VOUT = 5V, NO LOAD, PFM MODE
MAXM15462 SHUTDOWN THROUGH VIN
VIN = 12V,ADJUSTABLE VOUT = 1.5V,
FULL LOAD, PWM MODE
toc66
toc65
toc64
10V/div
5V/div
VIN
10V/div
LX
10V/div
VCC
VCC
2V/div
VOUT
VOUT
500mV/div
VIN
EN/UVLO
20V/div
LX
10V/div
LX
2V/div
5V/div
VOUT
RESET
2V/div
500mV/div
1ms/div
1ms/div
MAXM15462 STARTUP THROUGH VIN
VIN = 24V, ADJUSTABLE VOUT = 3.3V,
FULL LOAD, PWM MODE
1ms/div
MAXM15462 SHUTDOWN THROUGH VIN
VIN = 24V, ADJUSTABLE VOUT = 3.3V,
FULL LOAD, PWM MODE
MAXM15462 STARTUP THROUGH VIN
VIN = 24V, ADJUSTABLE VOUT = 5V,
FULL LOAD, PWM MODE
toc68
toc69
toc67
20V/div
VIN
20V/div
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
1ms/div
MAXM15463 STARTUP THROUGH VIN
VIN = 24V, FIXED VOUT = 3.3V, FULL LOAD, PWM MODE
MAXM15463 SHUTDOWN THROUGH VIN
VIN = 24V,FIXED VOUT = 3.3V, FULL LOAD, PWM MODE
1ms/div
MAXM15462 SHUTDOWN THROUGH VIN
VIN = 24V, ADJUSTABLE VOUT = 5V,
FULL LOAD, PWM MODE
toc70
toc71
toc72
20V/div
20V/div
VIN
LX
20V/div
VIN
VIN
20V/div
LX
LX
20V/div
VCC
VCC
2V/div
VOUT
VOUT
2V/div
20V/div
2V/div
2V/div
VCC
2V/div
VOUT
2V/div
1ms/div
1ms/div
1ms/div
www.maximintegrated.com
Maxim Integrated │ 11
MAXM15462/MAXM15463/
MAXM15464
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.)
toc73
MAXM15462 OUTPUT SHORT IN STEADY STATE
VIN = 24V, ADJUSTABLE VOUT = 3.3V,
FULL LOAD, PWM MODE
MAXM15464 SHUTDOWN THROUGH VIN
VIN = 24V, FIXED VOUT = 5V, FULL LOAD, PWM MODE
toc75
toc74
20V/div
VIN
20V/div
LX
5V/div
VIN
20V/div
LX
20V/div
SHORT
2V/div
VOUT
2V/div
2V/div
LX
VCC
VCC
2V/div
VOUT
VOUT
2V/div
MAXM15462 OUTPUT SHORT DURING STARTUP
VIN = 24V, VOUT = 3.3V, FULL LOAD, PWM MODE
toc76
20ms/div
MAXM15463 OUTPUT SHORT IN STEADY STATE
VIN = 24V, FIXED VOUT = 3.3V, FULL LOAD, PWM MODE
MAXM15463 OUTPUT SHORT DURING STARTUP
VIN = 24V, FIXED VOUT = 3.3V, FULL LOAD, PWM MODE
toc77
20V/div
toc78
20V/div
5V/div
SHORT
VIN
VOUT
20mV/div
LX
20V/div
IOUT
10mA/div
VIN
VOUT
2V/div
VOUT
LX
20V/div
LX
IOUT
500mA/div
20ms/div
MAXM15464 OUTPUT SHORT IN STEADY STATE
VIN = 24V, FIXED VOUT = 5V, FULL LOAD, PWM MODE
MAXM15464 OUTPUT SHORT DURING STARTUP
VIN = 24V, FIXED VOUT = 5V, FULL LOAD, PWM MODE
toc79
SHORT
toc81
80
60
20V/div
GAIN (dB)
2V/div
VOUT
500mA/div
IOUT
20V/div
LX
200mA/div
IOUT
PHASE
20
0
www.maximintegrated.com
20ms/div
30
0
GAIN
-30
-40
CROSSOVER FREQUENCY = 51.42kHz
PHASE MARGIN = 53.85°
-60
-80
20ms/div
90
60
40
-20
20V/div
200mA/div
MAXM15462 BODE PLOT
VIN = 12V, ADJUSTABLE VOUT = 1.5V,
FULL LOAD, PWM MODE
VIN
5V/div
20V/div
IOUT
toc80
5V/div
2V/div
20ms/div
20ms/div
LX
200mA/div
IOUT
1ms/div
1ms/div
VOUT
20V/div
PHASE MARGIN (⁰)
MAXM15464 STARTUP THROUGH VIN
VIN = 24V, FIXED VOUT = 5V, FULL LOAD, PWM MODE
1k
10k
-60
-90
100k
FREQUENCY (Hz)
Maxim Integrated │ 12
MAXM15462/MAXM15463/
MAXM15464
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.)
0
GAIN
-20
-30
GAIN (dB)
0
PHASE MARGIN (⁰)
30
20
0
0
GAIN
-30
-60
CROSSOVER FREQUENCY = 45.732kHz
PHASE MARGIN = 56.3°
-90
100k
10k
-80
1k
PHASE
0
-30
1k
-60
-90
100k
10k
FREQUENCY (Hz)
ADJUSTABLE VOUT = 2.5V
200
150
100
toc87
FIXED VOUT = 5V
200
150
FIXED VOUT = 3.3V
100
50
50
0
-90
100k
10k
350
250
-40
CROSSOVER FREQUENCY = 50.57kHz
PHASE MARGIN = 61.155°
toc86
250
-30
-60
CROSSOVER FREQUENCY = 46.091kHz
PHASE MARGIN = 60.693°
MAXM15463/4
OUTPUT CURRENT vs. AMBIENT TEMPERATURE
300
0
0
GAIN
FREQUENCY (Hz)
300
GAIN
0
50
70
90
110
130
50
70
90
110
130
AMBIENT TEMPERATURE (°C)
AMBIENT TEMPERATURE (°C)
CONDUCTED EMISSION PLOT
(WITH FILTER C = 0.1µF + 0.68µF, L = 82µH, C = 1µF)
RADIATED EMISSION PLOT
toc89
70
toc88
70
60
MAGNITUDE (dBµV/m)
CISPR-22 CLASS B QP LIMIT
60
MAGNITUDE (dBµV)
-80
60
30
20
1k
-90
100k
10k
350
OUTOPUT CURRENT (mA)
60
-60
0
-20
90
PHASE MARGIN (⁰)
toc85
30
20
-60
MAXM15462
OUTPUT CURRENT vs. AMBIENT TEMPERATURE
80
-20
60
PHASE
FREQUENCY (Hz)
MAXM15464 BODE PLOT
VIN = 24V, FIXED VOUT = 5V,
FULL LOAD, PWM MODE
40
-60
CROSSOVER FREQUENCY = 43.26kHz
PHASE MARGIN = 58.03°
-60
OUTPUT CURRENT (mA)
1k
90
-40
FREQUENCY (Hz)
GAIN (dB)
30
20
toc84
60
-40
-60
-80
80
40
PHASE
-20
-40
-80
90
60
40
PHASE
toc83
60
60
40
GAIN (dB)
80
PHASE MARGIN (⁰)
60
90
MAXM15463 BODE PLOT
VIN = 24V, FIXED VOUT = 3.3V,
FULL LOAD, PWM MODE
GAIN (dB)
80
MAXM15462 BODE PLOT
VIN = 24V, ADJUSTABLE VOUT = 5V,
FULL LOAD, PWM MODE
PHASE MARGIN (⁰)
MAXM15462 BODE PLOT
VIN = 24V, ADJUSTABLE VOUT = 3.3V,
FULL LOAD, PWM MODE
toc82
CISPR-22 CLASS B
AVG LIMIT
50
PEAK
EMISSION
40
30
20
50
40
CISPR-22 CLASS B QP
LIMIT
30
VERTICAL
SCAN
20
10
10
0
AVERAGE
EMISSION
150k
1M
10M
FREQUENCY(Hz)
CONDITIONS: VIN = 24V, VOUT = 5V, IOUT = 0.3A
www.maximintegrated.com
-10
HORIZONTAL
SCAN
30M
100M
FREQUENCY(Hz)
1G
CONDITIONS: VIN = 24V, VOUT = 5V, IOUT = 0.3A
Maxim Integrated │ 13
MAXM15462/MAXM15463/
MAXM15464
4.5V to 42V, 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
MAXM15462
MAXM15463
MAXM15464
‘+’ 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 for MAXM15462. Connect to output voltage node (VOUT) for MAXM15463 and MAXM15464.
See Output-Voltage Setting section for more details.
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 │ 14
MAXM15462/MAXM15463/
MAXM15464
4.5V to 42V, 300mA Himalaya uSLIC
Step-Down Power Module
Functional Diagrams
Internal Diagram
MAXM15462/MAXM15463/
MAXM15464
VCC
VIN
LDO
HIGH-SIDE
DRIVER
+
-
EN/UVLO
1.215V
LX
33µH
OUT
PEAK
CURRENT-MODE
CONTROLLER
OSCILLATOR
LOW-SIDE
DRIVER
SOFT-START
MODE
GND
MODE
SELECTION
LOGIC
SLOPE
COMPENSATION
*S1
FB
R3
*S2
RESET
LOGIC
R4
RESET
Table A
MODULE PART NUMBER
S1
S2
R3 (KΩ)
R4 (KΩ)
MAXM15462
CLOSE
OPEN
OPEN
OPEN
MAXM15463
OPEN
CLOSE
205.33
77
MAXM15464
OPEN
CLOSE
350.80
77
www.maximintegrated.com
Maxim Integrated │ 15
MAXM15462/MAXM15463/
MAXM15464
Detailed Description
The MAXM15462/MAXM15463/MAXM15464 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 deliver an output current up to 300mA. The MAXM15463 and MAXM15464
are fixed 3.3V and 5V output modules respectively. The
MAXM15462 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, 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
www.maximintegrated.com
4.5V to 42V, 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 │ 16
MAXM15462/MAXM15463/
MAXM15464
4.5V to 42V, 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 MAXM15462/MAXM15463/MAXM15464 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 MAXM15462/3/4 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
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 MAXM15463, VIN(MIN) = 5.5V, VIN(MAX) = 42V
For MAXM15464, VIN(MIN) = 12V, VIN(MAX) = 42V
Selection of Input Capacitor
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 +
www.maximintegrated.com
∆I
< 0.49
2
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 │ 17
MAXM15462/MAXM15463/
MAXM15464
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.
VIN
R1
MAXM15462
MAXM15463
MAXM15464
EN/UVLO
4.5V to 42V, 300mA Himalaya uSLIC
Step-Down Power Module
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
Connect FB of MAXM15463 and MAXM15464 directly to
VOUT for feedback control.
OUT
MAXM15462
R3
FB
R4
R2
Figure 1. Adjustable EN/UVLO Network
www.maximintegrated.com
Figure 2. Setting the Output Voltage
Maxim Integrated │ 18
MAXM15462/MAXM15463/
MAXM15464
4.5V to 42V, 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)
C IN
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
25.5
1.8
1 x 1µF 0805 50V
1 x 22µF 1206 6.3V
(Murata GRM21BR71105KA12L) (Murata GRM31CR70J226KE19L)
75
75
4.5
36
2.5
1 x 1µF 0805 50V
1 x 22µF 1206 6.3V
(Murata GRM21BR71105KA12L) (Murata GRM31CR70J226KE19L)
133
75
5.5
42
3.3
1 x 1µF 0805 50V
1 x 10µF 1206 6.3V
(Murata GRM21BR71105KA12L) (Murata GRM31CR70J106KA01L)
200
75
12
42
5
1 x 1µF 0805 50V
1 x 10µF 1206 6.3V
(Murata GRM21BR71105KA12L) (Murata GRM31CR70J106KA01L)
348
75
MAXM15463
5.5
42
3.3
1 x 1μF 0805 50V
1 x 10μF 1206 6.3V
(Murata GRM21BR71105KA12L) (Murata GRM31CR70J106KA01L)
N/A
N/A
MAXM15464
12
42
5
1 x 1μF 0805 50V
1 x 10μF 1206 6.3V
(Murata GRM21BR71105KA12L) (Murata GRM31CR70J106KA01L)
N/A
N/A
MAXM15462
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 42V.
Power Dissipation
The power dissipation inside the module leads to
increase in the junction temperature of the MAXM15462/
MAXM15463/MAXM15464. 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
www.maximintegrated.com
For the MAXM15462/MAXM15463/MAXM15464 evaluation board, the thermal resistance from junction-toambient (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
MAXM15462/MAXM15463/MAXM15464 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 │ 19
MAXM15462/MAXM15463/
MAXM15464
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
R4
MODE
GND
CIN
GND PLANE
1
GND
2
+
LX
MAXM15462
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
R3
GND PLANE
R4
VIA TO INNER LAYER FOR ROUTING FB
Figure 3. Adjustable Output Layout Guidelines
www.maximintegrated.com
Maxim Integrated │ 20
MAXM15462/MAXM15463/
MAXM15464
4.5V to 42V, 300mA Himalaya uSLIC
Step-Down Power Module
VIN
CIN
VOUT
OUT
VIN
COUT
MAXM15463
MAXM15464
R1
RESET
R2
EN/UVLO
FB
VCC
LX
CVCC
GND
MODE
CIN
GND PLANE
1
+
LX
MAXM15463
MAXM15464
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
GND PLANE
VIA TO INNER LAYER FOR ROUTING FB
Figure 4. Fixed Output Layout Guidelines
www.maximintegrated.com
Maxim Integrated │ 21
MAXM15462/MAXM15463/
MAXM15464
4.5V to 42V, 300mA Himalaya uSLIC
Step-Down Power Module
Typical Application Circuits
Typical Application Circuit for Adjustable 3.3V Output
VIN
5.5V TO 42V
C1
1µF
VIN
OUT
EN/UVLO
GND
VOUT
3.3V, 300mA
C2
10µF
MAXM15462
C3
RESET
FB
VCC
LX
R2
75kΩ
MODE
1µF
R1
200kΩ
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 Adjustable 2.5V output
VIN
4.5V TO 36V
C1
1µF
VIN
OUT
EN/UVLO
GND
VOUT
2.5V, 300mA
C2
22µF
MAXM15462
C3
1µF
RESET
FB
VCC
LX
MODE
R1
133kΩ
R2
75kΩ
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)
www.maximintegrated.com
Maxim Integrated │ 22
MAXM15462/MAXM15463/
MAXM15464
4.5V to 42V, 300mA Himalaya uSLIC
Step-Down Power Module
Typical Application Circuits (continued)
Typical Application Circuit for Adjustable 1.5V output
VIN
4.5V TO 21.5V
C1
1µF
VIN
OUT
EN/UVLO
GND
MAXM15462
C3
RESET
FB
VCC
LX
VOUT
1.5V, 300mA
C2
22µF R1
50kΩ
R2
75kΩ
MODE
1µF
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)
Typical Application Circuit for Fixed 3.3V output
VIN
5.5V TO 42V
C1
OUT
VIN
EN/UVLO
1µF
GND
VOUT
3.3V, 300mA
C2
10µF
MAXM15463
C3
RESET
FB
VCC
LX
1µF
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)
www.maximintegrated.com
Maxim Integrated │ 23
MAXM15462/MAXM15463/
MAXM15464
4.5V to 42V, 300mA Himalaya uSLIC
Step-Down Power Module
Typical Application Circuits (continued)
Typical Application Circuit for Fixed 5V Output
VIN
12V TO 42V
C1
OUT
VIN
EN/UVLO
1µF
GND
VOUT
5V, 300mA
C2
10µF
MAXM15464
C3
RESET
FB
VCC
LX
1µF
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
MAXM15462AMB+
-40°C to +125°C
10-pin uSLIC
MAXM15462AMB+T
-40°C to +125°C
10-pin uSLIC
MAXM15463AMB+
-40°C to +125°C
10-pin uSLIC
MAXM15463AMB+T
-40°C to +125°C
10-pin uSLIC
MAXM15464AMB+
-40°C to +125°C
10-pin uSLIC
MAXM15464AMB+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 │ 24
MAXM15462/MAXM15463/
MAXM15464
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.
3
7/18
Updated the General Description, Benefits and Features, Detailed Description,
RESET Output, Startup into a Prebiased Output, Overcurrent Protection (OCP)/Hiccup
Mode, Input-Voltage Range, Output-Voltage Setting and Power Dissipation sections;
updated the Electrical Characteristics, Pin Description and Ordering Information
tables, Table 1, and the Typical Application Circuit 5V on page 1; added the Typical
Application Circuit 2.5V on page 1, Figure 4, Typical Application Circuit Fixed 3.3V and
Fixed 5V, and Table A; replaced TOC01-TOC89, Pin Configuration, and Figure 1.
4
8/18
Updated the Typical Application Circuit 2.5V, Electrical Characteristics, Figure 3, and
Figure 4.
1, 2
1
1–19
1, 3, 20-21
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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