MAXM15068AMB [MAXIM]
7.5V to 60V, 200mA Himalaya uSLIC Step-Down Power Module;
| 型号： | MAXM15068AMB |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | 7.5V to 60V, 200mA Himalaya uSLIC Step-Down Power Module |
| 文件： | 总18页 (文件大小：3239K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
EVALUATION KIT AVAILABLE
Click here for production status of specific part numbers.
MAXM15068
7.5V to 60V, 200mA Himalaya uSLIC
Step-Down Power Module
General Description
Benefits and Features
● Easy to Use
The Himalaya series of voltage regulator ICs and power
modules enable cooler, smaller, and simpler power-
supply solutions. The MAXM15068 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 7.5V to 60V input and delivers
up to 200mA output current over a programmable output
voltage from 5V to 12V. The module significantly reduces
design complexity, manufacturing risks, and offers a true
plug and play power/supply solution, reducing time-to-
market.
• Wide 7.5V to 60V Input Range
• Adjustable 5V to 12V Output
• ±1.44% Feedback Accuracy
• Up to 200mA 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
The MAXM15068 employs peak-current-mode control
architecture. To reduce input inrush current, the device
offers a fixed 3.75ms soft-start time.
●
Robust Operation
The MAXM15068 module is available in a low profile, com-
pact 10-pin, 2.6mm × 3mm × 1.5mm, uSLIC™ package.
• Hiccup Overcurrent Protection
• Overtemperature Protection
• -40°C to +125°C Ambient Operating Temperature/
-40°C to +150°C Junction Temperature
Applications
● Industrial Sensors and Process Control
● 4-20mA Current-Loop Powered Sensors
● LDO Replacement
● Rugged
• Complies with CISPR22 (EN55022) Class B
Conducted and Radiated Emissions
• Passes Drop, Shock, and Vibration Standards:
JESD22-B103, B104, B111
● HVAC and Building Control
● Battery-Powered Equipment
● General Purpose Point-of-Load
Ordering Information appears at end of data sheet.
uSLIC is a trademark of Maxim Integrated Products, Inc.
Typical Application Circuit
V
OUT
V
IN
12V, 200mA
15.5V to 60V
OUT
GND
V
IN
C
C
IN
OUT
R1
R3
931kΩ
4.7µF
1µF
RESET
2.2MΩ
MAXM15068
FB
LX
EN/UVLO
V
CC
R2
191kΩ
R4
75kΩ
C3
MODE
1µF
19-100645; Rev 0; 9/19
MAXM15068
7.5V to 60V, 200mA Himalaya uSLIC
Step-Down Power Module
Absolute Maximum Ratings
IN
LX, OUT and GND .....................................-0.3V to (V + 0.3V)
V
, EN/UVLO to GND............................................-0.3V to 70V
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
IN
V
, FB, RESET to GND..........................................-0.3V to 6V
CC
MODE to GND.......................................... -0.3V to (V
+ 0.3V)
CC
Output Short-Circuit Duration....................................Continuous
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
21-100094
90-100027
Outline Number
Land Pattern Number
THERMAL RESISTANCE, FOUR-LAYER BOARD (Note 2)
Junction-to-Ambient (θ
)
41.5°C/W
JA
Note 1: Junction temperature greater than +125°C degrades operating lifetimes.
Note 2: Package thermal resistances are measured on an evaluation board with natural convection.
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.
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MAXM15068
7.5V to 60V, 200mA Himalaya uSLIC
Step-Down Power Module
Electrical Characteristics
(V = V
= 24V, V
= 0V, C
= 1μF, FB = 1V, LX = MODE = RESET = OUT = unconnected; T = -40°C to +125°C, unless
IN
EN/UVLO
GND
VCC
A
otherwise noted. Typical values are at T = +25°C. All voltages are referenced to GND, unless otherwise noted.) (Note 3)
A
PARAMETER
INPUT SUPPLY (V
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
)
IN
Input-Voltage Range
V
7.5
60
4
V
IN
Input-Shutdown Current
I
V
= 0V, shutdown mode
2.2
90
μA
IN-SH
EN/UVLO
MODE = unconnected,
FB = 1.03 × V
FB-REG
I
160
μA
Q-PFM
Input-Supply Current
I
Normal switching mode, MODE = 0
3.4
mA
Q-PWM
ENABLE/UVLO (EN/UVLO)
V
V
V
rising
falling
1.19
1.06
1.215
1.09
1.28
1.16
ENR
EN/UVLO
EN/UVLO
EN/UVLO Threshold
V
V
ENF
EN/UVLO Input
leakage-Current
I
T
+25° C
-100
+100
nA
EN/UVLO
A =
LDO (V
)
CC
V
Output-Voltage
CC
V
7.5V < V < 60V, 0mA < I < 10mA
VCC
4.75
5
5.25
V
CC
IN
Range
V
Current Limit
I
V
V
V
= 4.3V
rising
13
4.05
3.7
30
4.18
3.8
50
4.3
mA
CC
VCC-MAX
CC
CC
CC
V
CC-UVR
V
UVLO
V
CC
V
falling
3.95
CC-UVF
SOFT-START (SS)
Soft-Start Time
t
3.5
3.75
4
ms
SS
FEEDBACK (FB)
MODE = GND
0.887
0.887
-100
0.9
0.915
-25
0.913
0.936
FB-Regulation Voltage
V
V
FB-REG
MODE = unconnected
FB-Leakage Current
TIMING
I
nA
FB
Switching Frequency
f
515
550
585
kHz
%
SW
FB Undervoltage Trip
Level to Cause Hiccup
62.5
64.5
66.5
Hiccup Timeout
120
90
ms
ns
%
Minimum On-Time
Maximum Duty Cycle
t
120
94
ON-MIN
D
FB = 0.98 x FB
89
91.4
MAX
REG
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MAXM15068
7.5V to 60V, 200mA Himalaya uSLIC
Step-Down Power Module
Electrical Characteristics (continued)
(V = V
= 24V, V
= 0V, C
= 1μF, FB = 1V, LX = MODE = RESET = OUT = unconnected; T = -40°C to +125°C, unless
IN
EN/UVLO
GND
VCC A
otherwise noted. Typical values are at T = +25°C. All voltages are referenced to GND, unless otherwise noted.) (Note 3)
A
PARAMETER
RESET
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
FB Threshold for RESET
Rising
FB rising
93.5
90
95.5
92
97.5
94
%
%
FB Threshold for RESET
Falling
FB falling
RESET Delay After FB
Reaches 95% Regulation
1.9
ms
V
RESET Output Level
Low
0.2
0.1
I
= 5mA
RESET
RESET Output Leakage
Current
μA
V
= 5.5V, T = +25°C
A
RESET
MODE
MODE Internal Pullup
Resistor
500
kΩ
THERMAL SHUTDOWN
Thermal-Shutdown
Threshold
Temperature rising
166
10
°C
°C
Thermal-Shutdown
Hysteresis
Note 3: Electrical specifications are production tested at T = +25°C. Specifications over the entire operating temperature range are
A
guaranteed by design and characterization.
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MAXM15068
7.5V to 60V, 200mA Himalaya uSLIC
Step-Down Power Module
Typical Operating Characteristics
(V = V
= 24V, V
= 0V, T = -40°C to +125°C, unless otherwise noted. Typical values are at T = +25°C. All voltages
IN
EN/UVLO
GND A A
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
EFFICIENCY vs. LOAD CURRENT
VOUT = 5V, PWM MODE
EFFICIENCY vs. LOAD CURRENT
VOUT = 12V, PWM MODE
toc01
toc02
toc03
100
90
80
70
60
50
40
30
20
10
0
100
90
80
70
60
50
40
30
20
10
0
100
90
80
70
60
50
40
30
20
10
0
VIN = 15.5V
VIN = 7.5V
VIN = 12V
VIN = 24V
VIN = 36V
VIN = 60V
VIN = 24V
VIN = 36V
VIN = 48V
VIN = 36V
VIN = 24V
VIN = 12V
VIN = 48V
VIN = 60V
VIN = 48V
VIN = 60V
VIN = 7.5V
1
10
LOAD CURRENT (mA)
100
0
20 40 60 80 100 120 140 160 180 200
LOAD CURRENT (mA)
0
20 40 60 80 100 120 140 160 180 200
LOAD CURRENT (mA)
EFFICIENCY vs. LOAD CURRENT
VOUT = 12V, PFM MODE
toc04
OUTPUT VOLTAGEvs
.
LOAD CURRENT
OUTPUT VOLTAGEvs. LOAD CURRENT
VOUT = 5V, PWM MODE
VOUT = 12V, PWM MODE
toc05
toc06
5.0390
5.0385
5.0380
5.0375
5.0370
5.0365
5.0360
5.0355
5.0350
5.0345
5.0340
12.030
12.028
12.026
12.024
12.022
12.020
12.018
12.016
12.014
12.012
100
90
80
70
60
50
40
30
20
10
0
VIN = 7.5V
VIN = 15.5V
VIN = 24V
VIN = 36V
VIN = 12V
VIN = 24V
VIN = 36V
VIN = 48V
VIN = 60V
VIN = 36V
VIN = 60V
VIN = 48V
VIN = 24V
VIN = 15.5V
VIN = 48V
VIN = 60V
1
10
LOAD CURRENT (mA)
100
0
20 40 60 80 100 120 140 160 180 200
LOAD CURRENT (mA)
0
20 40 60 80 100 120 140 160 180 200
LOAD CURRENT (mA)
OUTPUT VOLTAGE RIPPLE
VIN = 24V, VOUT = 5V
FULL LOAD, PWM MODE
OUTPUT VOLTAGEvs
.
LOAD CURRENT
OUTPUT VOLTAGEvs
. LOAD CURRENT
VOUT = 5V, PFM MODE
VOUT = 12V, PFM MODE
toc09
toc07
toc08
5.136
5.124
5.112
5.100
5.088
5.076
5.064
5.052
5.040
5.028
5.016
12.28
12.24
12.20
12.16
12.12
12.08
12.04
12.00
11.96
VIN = 15.5V
VIN = 7.5V
VIN = 12V
VIN = 24V
VIN = 36V
VIN = 24V
VIN = 36V
10mV/div
VOUT(AC)
VIN = 48V
VIN = 60V
VIN = 48V
VIN = 60V
0
20 40 60 80 100 120 140 160 180 200
LOAD CURRENT (mA)
0
20 40 60 80 100 120 140 160 180 200
LOAD CURRENT (mA)
2µs/div
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MAXM15068
7.5V to 60V, 200mA Himalaya uSLIC
Step-Down Power Module
Typical Operating Characteristics (continued)
(V = V
= 24V, V
= 0V, T = -40°C to +125°C, unless otherwise noted. Typical values are at T = +25°C. All voltages
IN
EN/UVLO
GND A A
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 RIPPLE
VIN = 24V, VOUT = 12V
INTPUT VOLTAGE RIPPLE
VIN = 24V, VOUT = 5V
INTPUT VOLTAGE RIPPLE
VIN = 24V, VOUT = 12V
FULL LOAD, PWM MODE
FULL LOAD, PWM MODE
FULL LOAD, PWM MODE
toc10
toc11
toc12
VIN(AC)
50mV/div
10mV/div
50mV/div
VOUT(AC)
VIN(AC)
2µs/div
2µs/div
2µs/div
LOAD TRANSIENT RESPONSE
VIN = 24V, VOUT = 5V, PFM MODE
LOAD STEP BETWEEN 5mA TO 50mA
LOAD TRANSIENT RESPONSE
VIN = 24V, VOUT = 5V, PWM MODE
LOAD TRANSIENT RESPONSE
VIN = 24V, VOUT = 12V, PFM MODE
LOAD STEP BETWEEN 100mA TO 200mA
LOAD STEP BETWEEN 5mA TO 50mA
toc13
toc14
toc15
200mV/div
100mV/div
VOUT(AC)
VOUT(AC)
VOUT(AC)
100mV/div
100mA/div
IOUT
IOUT
50mA/div
50mA/div
IOUT
100µs/div
100µs/div
100µs/div
STARTUP THROUGH ENABLE
VIN = 24V, VOUT = 5V
FULL LOAD, PWM MODE
SHUTDOWN THROUGH ENABLE
VIN = 24V, VOUT = 5V
FULL LOAD, PWM MODE
LOAD TRANSIENT RESPONSE
VIN = 24V, VOUT = 12V, PWM MODE
LOAD STEP BETWEEN 100mA TO 200mA
toc17
toc18
toc16
2V/div
EN/UVLO
LX
EN/UVLO
LX
2V/div
VOUT(AC)
200mV/div
100mA/div
20V/div
2V/div
20V/div
2V/div
5V/div
VOUT
VOUT
5V/div
IOUT
RESET
RESET
1ms/div
100µs/div
100µs/div
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MAXM15068
7.5V to 60V, 200mA Himalaya uSLIC
Step-Down Power Module
Typical Operating Characteristics (continued)
(V = V
= 24V, V
= 0V, T = -40°C to +125°C, unless otherwise noted. Typical values are at T = +25°C. All voltages
IN
EN/UVLO
GND A A
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 = 5V
STARTUP THROUGH ENABLE (2V PREBIAS)
VIN = 24V, VOUT = 5V
STARTUP THROUGH ENABLE
VIN = 24V, VOUT = 12V
NO LOAD, PWM MODE
NO LOAD, PFM MODE
FULL LOAD, PWM MODE
toc19
toc20
toc21
2V/div
2V/div
2V/div
EN/UVLO
LX
EN/UVLO
LX
EN/UVLO
LX
20V/div
2V/div
20V/div
2V/div
20V/div
5V/div
VOUT
VOUT
5V/div
VOUT
5V/div
5V/div
RESET
RESET
RESET
1ms/div
1ms/div
1ms/div
STARTUP THROUGH ENABLE (5V PREBIAS)
VIN = 24V, VOUT = 12V
SHUTDOWN THROUGH ENABLE
VIN = 24V, VOUT = 12V
FULL LOAD, PWM MODE
STARTUP THROUGH ENABLE (5V PREBIAS)
VIN = 24V, VOUT = 12V
NO LOAD, PWM MODE
NO LOAD, PFM MODE
toc22
toc23
toc24
2V/div
2V/div
EN/UVLO
LX
EN/UVLO
LX
EN/UVLO
LX
2V/div
20V/div
5V/div
20V/div
5V/div
20V/div
5V/div
5V/div
VOUT
5V/div
VOUT
VOUT
5V/div
RESET
RESET
RESET
100µs/div
1ms/div
1ms/div
SHUTDOWN THROUGH VIN
VIN = 24V, VOUT = 5V
FULL LOAD, PWM MODE
STARTUP THROUGH VIN
VIN = 24V, VOUT = 12V
FULL LOAD, PWM MODE
STARTUP THROUGH VIN
VIN = 24V, VOUT = 5V
FULL LOAD, PWM MODE
toc26
toc25
toc27
20V/div
20V/div
VIN
LX
20V/div
20V/div
VIN
LX
VIN
LX
20V/div
2V/div
20V/div
2V/div
2V/div
5V/div
2V/div
2V/div
VCC
VCC
VCC
VOUT
VOUT
VOUT
1ms/div
1ms/div
1ms/div
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MAXM15068
7.5V to 60V, 200mA Himalaya uSLIC
Step-Down Power Module
Typical Operating Characteristics (continued)
(V = V
= 24V, V
= 0V, T = -40°C to +125°C, unless otherwise noted. Typical values are at T = +25°C. All voltages
IN
EN/UVLO
GND A A
are referenced to GND, unless otherwise noted. The circuit values for different output voltage applications are as in Table 1, unless
otherwise noted.)
SHUTDOWN THROUGH VIN
VIN = 24V, VOUT = 12V
FULL LOAD, PWM MODE
OUTPUT SHORT IN STEADY STATE
VIN = 24V, VOUT = 5V
OUTPUT SHORT DURING STARTUP
VIN = 24V, VOUT = 5V
toc28
FULL LOAD, PWM MODE
FULL LOAD, PWM MODE
toc30
toc29
20V/div
5V/div
5V/div
20V/div
20V/div
VIN
LX
SHORT
VOUT
VIN
VOUT
20mV/div
20V/div
20V/div
LX
LX
2V/div
5V/div
VCC
IOUT
IOUT
500mA/div
10mA/div
VOUT
20ms/div
20ms/div
1ms/div
OUTPUT SHORT IN STEADY STATE
VIN = 24V, VOUT = 12V
OUTPUT SHORT DURING STARTUP
VIN = 24V, VOUT = 12V
FULL LOAD, PWM MODE
FULL LOAD, PWM MODE
toc32
toc31
20V/div
5V/div
SHORT
VOUT
VIN
VOUT
10V/div
20mV/div
LX
20V/div
20V/div
LX
IOUT
IOUT
10mA/div
500mA/div
20ms/div
20ms/div
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MAXM15068
7.5V to 60V, 200mA Himalaya uSLIC
Step-Down Power Module
Typical Operating Characteristics (continued)
(V = V
= 24V, V
= 0V, T = -40°C to +125°C, unless otherwise noted. Typical values are at T = +25°C. All voltages
IN
EN/UVLO
GND A A
are referenced to GND, unless otherwise noted. The circuit values for different output voltage applications are as in Table 1, unless
otherwise noted.)
BODE PLOT
VIN = 24V, VOUT = 12V
FULL LOAD, PWM MODE
BODE PLOT
VIN = 24V, VOUT = 5V
FULL LOAD, PWM MODE
OUTPUT CURRENT vs. AMBIENT TEMPERATURE
toc35
250
toc34
toc33
100
80
100
80
100
80
100
80
PHASE
PHASE
200
150
100
50
60
60
60
60
40
40
40
40
VOUT = 12V
VOUT = 5V
20
20
20
20
0
0
0
0
GAIN
GAIN
-20
-40
-60
-80
-20
-40
-60
-80
-20
-40
-60
-80
-20
-40
-60
-80
CROSSOVER FREQUENCY = 18.440kHz
CROSSOVER FREQUENCY = 25.642kHz
PHASE MARGIN = 53.439
PHASE MARGIN = 53.679
°
°
0
1k
10k
100k
1k
10k
100k
50
70
90
110
130
AMBIENT TEMPERATURE (°C)
FREQUENCY (Hz)
FREQUENCY (Hz)
RADIATED EMISSION PLOT
LEMI_1 = SHORT, CEMI_1 = CEMI_2 = OPEN
toc37
50
40
30
CISPR-22 CLASS B QP LIMIT
VERTICAL
SCAN
20
10
HORIZONTAL
SCAN
0
-10
30M
1G
100M
FREQUENCY(Hz)
CONDITIONS : VIN = 24V, VOUT = 12V, IOUT = 0.2A
FROM MAXM15068EVKIT#
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MAXM15068
7.5V to 60V, 200mA Himalaya uSLIC
Step-Down Power Module
Pin Configuration
TOP VIEW
V
LX
IN
IN
10
9
1
2
3
4
5
+
V
GND
RESET
MODE
OUT
MAXM15068
EN/UVLO
8
V
CC
7
FB
6
‘+’ INDICATES PIN 1 OF THE MODULE
10-PIN
(2.6mm × 3mm × 1.5mm)
Pin Description
PIN
NAME
FUNCTION
1
LX
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 MAXM15068 EV kit for a sample layout.
2
GND
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 1.9ms after FB
rises above 95.5% of its set value. See the Electrical Characteristics table for threshold values.
3
RESET
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.
4
5
MODE
OUT
FB
Module Output Pin. Connect a capacitor from OUT to GND. See 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.
6
7
V
Internal LDO Power Output. Bypass V
to GND with a minimum 1µF ceramic capacitor.
CC
CC
Active-High, Enable/Undervoltage-Detection Input. Pull EN/UVLO to GND to disable the module output.
8
EN/UVLO Connect EN/UVLO to V for always-on operation. Connect a resistor-divider between V , EN/UVLO, and
IN
IN
GND to program the input voltage at which the module turns on.
Power-Supply Input. Connect the V pins together. Decouple to GND with a capacitor;
IN
9,10
V
IN
place the capacitor close to the V and GND pins. See Table 1 for more details.
IN
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MAXM15068
7.5V to 60V, 200mA Himalaya uSLIC
Step-Down Power Module
Functional Diagram
Internal Diagram
MAXM15068
V
V
IN
CC
LDO
HIGH-SIDE
DRIVER
LX
+
EN/UVLO
-
68µH
1.215V
OUT
PEAK
CURRENT-MODE
CONTROLLER
OSCILLATOR
SOFT-START
LOW-SIDE
DRIVER
GND
MODE
SELECTION
LOGIC
MODE
SLOPE
COMPENSATION
RESET
RESET
LOGIC
FB
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MAXM15068
7.5V to 60V, 200mA Himalaya uSLIC
Step-Down Power Module
PFM Mode
Detailed Description
PFM mode disables negative output current from the mod-
ule, and skips pulses at light loads for better efficiency. In
PFM mode, the module output current is forced to a fixed
peak of 60mA 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 60mA peak. At light loads, PFM
mode gives higher efficiency compared to PWM mode
because of lower quiescent current drawn from supply.
The MAXM15068 module is a high-voltage, synchronous
step-down DC-DC module with integrated MOSFETs and
inductor, that operates over a wide 7.5V to 60V input
voltage range. The module delivers output current up to
200mA over a programmable output-voltage range of 5V
to 12V. When EN/UVLO and V
UVLO are ascertained,
CC
an internal power-up sequence ramps up the error-ampli-
fier reference, resulting in an output-voltage soft-start.
The FB pin monitors the output voltage through a resistor-
divider. The RESET pin transitions to a high-impedance
state 1.9ms after the output voltage reaches 95.5% of
regulation. The device selects either PFM or forced-
PWM mode depending on the state of the MODE pin at
power-up. By pulling the EN/UVLO pin to low, the device
enters 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 volt-
age to a fixed internal reference voltage and generates
an error voltage. The error voltage is compared to a sum
of the current-sense voltage and a slope-compensation
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, pro-
viding 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.
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 (V
)
CC
should be bypassed with a 1μF ceramic capacitor to
GND. An undervoltage lockout circuit disables the buck
converter when V
falls below 3.8V (typ). The 400mV,
CC
V
-UVLO hysteresis prevents chattering on power-up
CC
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 3.75ms
(typ), allowing a smooth increase of the output voltage.
Driving EN/UVLO low disables both power MOSFETs, as
Mode Selection (MODE)
The logic state of the MODE pin is latched after V
CC
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 chang-
es on the MODE pin are ignored during normal operation.
well as other internal circuitry, and reduces V quiescent
IN
current to below 2.2μA. EN/UVLO can be used as an
input-voltage UVLO adjustment input. An external volt-
age-divider between V and EN/UVLO to GND adjusts
IN
the input voltage at which the device turns on or turns off.
If input UVLO programming is not desired, connect EN/
PWM Mode
In PWM mode, the module output current is allowed to
go negative. PWM mode is useful in frequency sensi-
tive applications and provides fixed switching frequency
operation at all loads.
UVLO to V (see the Electrical Characteristics table for
IN
EN/UVLO rising and falling threshold voltages).
Maxim Integrated
│ 12
www.maximintegrated.com
MAXM15068
7.5V to 60V, 200mA Himalaya uSLIC
Step-Down Power Module
where:
RESET Output (RESET)
The device includes an open-drain RESET output to
monitor the output voltage. RESET goes high impedance
1.9ms 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.
V
= Steady-state output voltage,
= Maximum load current,
OUT
I
f
OUT
= Worst-case switching frequency (585 kHz),
= Maximum duty cycle (0.89),
SW
D
MAX
t
= Worst-case minimum controllable switch on-
ON(MIN)
time (120ns).
Startup into a Prebiased Output
The device is capable of soft-start into a prebiased out-
put, 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.
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 (I
) is
RMS
defined by the following equation:
Overcurrent Protection (OCP)/Hiccup Mode
The device is provided with a robust overcurrent protec-
tion (OCP) scheme that protects the device under over-
load and output short-circuit conditions. When overcurrent
is detected or if the FB node goes below 64.5% of its
nominal regulation threshold, the device enters hiccup
mode of operation. In hiccup mode, the device is protect-
ed by suspending switching for a hiccup timeout period
of 120ms (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 overcur-
V
× V − V
(
)
OUT
IN
OUT
√
I
= I
×
OUT MAX
)
RMS
(
V
IN
where I
is the maximum load current. I
a maximum value when the input voltage equals twice the
has
RMS
OUT(MAX)
output voltage (V = 2 × V
). So,
IN
OUT
I
OUT(MAX)
2
I
=
RMS(MAX)
rent condition is removed or if V or EN/UVLO is cycled.
IN
Choose an input capacitor that exhibits less than +10°C
temperature rise at the RMS input current for optimal
long-term reliability. Use low-ESR ceramic capacitors with
high-ripple-current capability at the input. X7R capacitors
are recommended in industrial applications for their tem-
perature stability. Calculate the input capacitance using
the following equation:
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, allow-
ing the device to cool down. The thermal sensor turns the
device on after the junction temperature cools by 10°C.
I
× D
× (1 − D
IN
)
MAX
MAX
OUT MAX
(
)
C
=
IN
f
× ∆ V
Applications Information
SW
Input Voltage Range
The minimum and maximum operating input voltages for
a given output voltage should be calculated as follows:
where:
= Maximum duty cycle (0.89),
D
MAX
f
= Switching frequency,
SW
∆V = Allowable input-voltage ripple.
IN
ꢀ 0.ꢁ
V
OUT
V
=
t
IN(MAX)
× f
ON(MIN) SW
Maxim Integrated
│ 13
www.maximintegrated.com
MAXM15068
7.5V to 60V, 200mA Himalaya uSLIC
Step-Down Power Module
Choose R1 to be 2.2MΩ (max), and then calculate R2 as
follows:
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,
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 cur-
rent in the application, such that the output-voltage devia-
tion is less than 3%. Required output capacitance can be
calculated from the following equation:
R1 × 1.215
R2 =
V
− 1.215
(
)
INU
where V
is the voltage at which the device is required
INU
to turn on.
If the EN/UVLO pin is driven from an external signal
source, a series resistance of minimum 1kΩ is recom-
mended to be placed between the signal source output
and the EN/UVLO pin to reduce voltage ringing on the
line.
ꢄ0
C
ꢃ
V
ꢀꢁꢂ
ꢀꢁꢂ
Output Voltage Setting
where C
is the output capacitance in μF and V
OUT
OUT
The MAXM15068 typical output voltage can be pro-
grammed from 5V to 12V. Set the output voltage by con-
necting a resistor-divider from output to FB to GND (see
Figure 2).
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 device offers an adjustable input undervoltage lock-
out level. Set the voltage at which the device turns on with
Choose R4 to be less than or equal to 75kΩ and calculate
R3 with the following equation:
a resistive voltage-divider connected from V to GND
(see Figure 1). Connect the center node of the divider to
EN/UVLO.
V
IN
OUT
0.9
R3 = R4 ×
− 1
(
)
OUT
FB
V
IN
R3
R4
MAXM15068
EN/UVLO
MAXM15068
R1
R2
Figure 1. Adjustable EN/UVLO Network
Figure 2. Setting the Output Voltage
Table 1. Selection of Components
V
V
V
(V)
R3
(kΩ)
R4
(kΩ)
IN(MIN)
(V)
IN(MAX)
(V)
OUT
C
C
OUT
IN
1 x 1µF 1206 100V
(TAIYO YUDEN HMK316B7105KLH)
1 x 10µF 0805 16V
(MURATAGRM21BZ71C106KE15)
7.5
60
60
5
348
75
75
1 x 1µF 1206 100V
(TAIYO YUDEN HMK316B7105KLH)
1 x 4.7µF 0805 25V
(MURATA GRM21BZ71E475KE15)
15.5
12
931
Maxim Integrated
│ 14
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MAXM15068
7.5V to 60V, 200mA Himalaya uSLIC
Step-Down Power Module
● Keep the output capacitors as close as possible to
Power Dissipation
the OUT and GND pins.
To operate in high ambient temperature, the device output
current needs to be derated. See the Typical Operating
Characteristics section for the derating curves to use as
a guide.
● Keep the resistive feedback dividers as close as
possible to the FB pin.
● Keep the power traces and load connections short.
Refer to EV kit layout for first-pass success.
PCB Layout Guidelines
Use the following guidelines for good PCB layout:
● Keep the input capacitors as close as possible to the
V
IN
and GND pins.
V
V
IN
OUT
OUT
V
IN
C
C
OUT
IN
MAXM15068
R1
R2
R3
R4
RESET
EN/UVLO
FB
LX
V
CC
C
VCC
GND
MODE
C
IN
V
IN
PLANE
GND PLANE
+
1
2
10
9
LX
V
V
IN
IN
MAXM15068
GND
R1
R2
EN/UVLO
RESET
8
7
3
4
MODE
V
CC
OUT
5
6
C
VCC
FB
C
OUT
V
PLANE
OUT
GND PLANE
R3
R4
VIA TO INNER LAYER FOR ROUTING FB
Figure 3. Layout Guidelines
Maxim Integrated
│ 15
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MAXM15068
7.5V to 60V, 200mA Himalaya uSLIC
Step-Down Power Module
Typical Application Circuits
Typical Application Circuit for 12V Output
V
OUT
V
IN
12V, 200mA
15.5V to 60V
OUT
GND
V
IN
C
C
2
1
R1
R3
931kΩ
4.7µF
1µF
RESET
2.2MΩ
MAXM15068
FB
LX
EN/UVLO
V
CC
R2
191kΩ
R4
75kΩ
C3
MODE
1µF
MODE = GND FOR PWM
MODE = OPEN FOR PFM
C1 = TAIYO YUDEN 1μF/X7R/100V/1206 (HMK316B7105KLH)
C2 = MURATA 4.7μF/X7R/25V/0805 (GRM21BZ71E475KE15)
C3 = TAIYO YUDEN 1μF/X7R/16V/0603 (EMK107B7105KA)
Typical Application Circuit for 5V Output
V
OUT
V
IN
5V, 200mA
7.5V to 60V
OUT
GND
V
IN
C
C
2
1
R1
R3
348kΩ
10µF
1µF
RESET
2.2MΩ
MAXM15068
FB
LX
EN/UVLO
V
CC
R2
442kΩ
R4
75kΩ
C3
MODE
1µF
MODE = GND FOR PWM
MODE = OPEN FOR PFM
C1 = TAIYO YUDEN 1μF/X7R/100V/1206 (HMK316B7105KLH)
C2 = MURATA 10μF/X7R/16V/0805 (GRM21BZ71C106KE15)
C3 = TAIYO YUDEN 1μF/X7R/16V/0603 (EMK107B7105KA)
Maxim Integrated
│ 16
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MAXM15068
7.5V to 60V, 200mA Himalaya uSLIC
Step-Down Power Module
Ordering Information
PART NUMBER
TEMP RANGE
PIN-PACKAGE
10-pin uSLIC
10-pin uSLIC
°
MAXM15068AMB+
-40 C to +125°C
°
MAXM15068AMB+T -40 C to +125°C
+Denotes a lead(Pb)-free/RoHS-compliant package.
T = Tape and reel.
Maxim Integrated
│ 17
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MAXM15068
7.5V to 60V, 200mA Himalaya uSLIC
Step-Down Power Module
Revision History
REVISION REVISION
PAGES
CHANGED
DESCRIPTION
NUMBER
DATE
0
9/19
Initial release
—
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.
2019 Maxim Integrated Products, Inc.
│ 18
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