MAXM17906AMB [MAXIM]
4.5V to 24V, 300mA Himalaya uSLIC Step-Down Power Module;
| 型号： | MAXM17906AMB |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | 4.5V to 24V, 300mA Himalaya uSLIC Step-Down Power Module |
| 文件： | 总26页 (文件大小：1122K) |
| 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.
MAXM17904/MAXM17905/
MAXM17906
4.5V to 24V, 300mA 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 MAXM17904/MAXM17905/MAXM17906
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 oper-
ate from 4.5V to 24V input and deliver up to 300mA
output current. The MAXM17904 and MAXM17905 are
fixed 3.3V and 5V output modules respectively. The
MAXM17906 is an adjustable output (0.9V to 6.3V)
module. The modules significantly reduce design
complexity, manufacturing risks, and offer a true plug and
play power/supply solution, reducing time-to-market.
• Wide 4.5V to 24V Input
• Adjustable 0.9V to 6.3V Output
• Fixed 3.3V and 5V Output
(MAXM17904 and MAXM17905)
• ±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
The MAXM17904/MAXM17905/MAXM17906 modules
employ peak-current-mode control architecture. To reduce
input inrush current, the modules offer a fixed 3.75ms
soft-start time.
● Robust Operation
• Hiccup Overcurrent Protection
• Overtemperature Protection
• -40°C to +125°C Ambient Operating Temperature/
-40°C to +150°C Junction Temperature
The MAXM17904/MAXM17905/MAXM17906 modules
are available in a low profile, compact 10-pin, 2.6mm x
3mm x 1.5mm, uSLIC™ package.
● Rugged
Applications
• Complies with CISPR22(EN55022) Class B
Conducted and Radiated Emissions
• Passes Drop, Shock, and Vibration Standards:
JESD22-B103, B104, B111
● Industrial Sensors and Encoders
● 4-20mA Current-Loop Powered Sensors
● LDO Replacement
● HVAC and Building Control
● Battery-Powered Equipment
● General Purpose Point-of-Load
● USB Type-C Powered Loads
Ordering Information appears at end of data sheet.
uSLIC is a trademark of Maxim Integrated Products, Inc.
Typical Application Circuit 2.5V
Typical Application Circuit 5V
V
OUT
V
12V
IN
V
OUT
V
12V
IN
5V, 300mA
2.5V, 300mA
V
IN
OUT
GND
V
IN
OUT
GND
C
10µF
OUT
C
10µF
OUT
C
1µF
IN
C
IN
1µF
R1
2.2MΩ
R3
133kΩ
EN/UVLO
RESET
MAXM17906
MAXM17905
FB
LX
FB
LX
EN/UVLO
RESET
V
R4
75kΩ
R2
825kΩ
CC
V
CC
C1
1µF
C1
1µF
MODE
MODE
19-100509; Rev 0; 3/19
MAXM17904/MAXM17905/
MAXM17906
4.5V to 24V, 300mA 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 29V
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 41.56 ºC/W
)
JA
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
(V = V
= 12V, V
= 0V, C
= 1μF, FB = 1V (MAXM17906), FB = 3.6V (MAXM17904) FB = 5.5V (MAXM17905),
IN
EN/UVLO
GND
VCC
LX = MODE = RESET = OUT = unconnected; T = -40°C to +125°C, unless otherwise noted. Typical values are at T = +25°C.
A
A
All voltages are referenced to GND, unless otherwise noted.) (Note 3)
PARAMETER
INPUT SUPPLY (V
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
)
IN
Input-Voltage Range
V
4.5
24
4
V
IN
Input-Shutdown Current
Input-Supply Current
I
V
= 0V, shutdown mode
2.2
95
μA
IN-SH
EN/UVLO
MODE = unconnected,
FB = 1.03 × V
I
160
μA
Q-PFM
FB-REG
Normal switching mode, V = 12V,
IN
MODE=0
I
3.2
mA
Q-PWM
ENABLE/UVLO (EN/UVLO)
V
V
V
V
rising
1.19
1.06
1.215
1.09
0.75
1.28
1.16
ENR
EN/UVLO
EN/UVLO
EN/UVLO
EN/UVLO Threshold
V
falling
V
ENF
EN-TRUESD
V
falling, true shutdown
EN/UVLO Input-Leakage
Current
I
T
= +25°C
-100
+100
nA
EN/UVLO
A
LDO (V
)
CC
V
V
Output-Voltage Range
Current Limit
V
6V < V < 24V, 0mA < I < 10mA
VCC
4.75
13
5
5.25
50
V
CC
CC
IN
I
V
= 4.3V
30
mA
CC
VCC-MAX
CC
Maxim Integrated
│ 2
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MAXM17904/MAXM17905/
MAXM17906
4.5V to 24V, 300mA Himalaya uSLIC
Step-Down Power Module
Electrical Characteristics (continued)
(V = V
= 12V, V
= 0V, C
= 1μF, FB = 1V (MAXM17906), FB = 3.6V (MAXM17904) FB = 5.5V (MAXM17905),
IN
EN/UVLO
GND
VCC
LX = MODE = RESET = OUT = unconnected; T = -40°C to +125°C, unless otherwise noted. Typical values are at T = +25°C.
A
A
All voltages are referenced to GND, unless otherwise noted.) (Note 3)
PARAMETER
Dropout
SYMBOL
CONDITIONS
= 4.5V, I = 5mA
VCC
MIN
TYP
0.15
4.18
3.8
MAX
0.3
UNITS
V
V
V
V
V
V
V
CC
CC-DO
IN
V
rising
falling
4.05
3.7
4.3
CC-UVR
CC
CC
UVLO
V
CC
V
3.95
CC-UVF
SOFT-START (SS)
Soft-Start Time
t
3.5
3.75
4
ms
SS
FEEDBACK (FB)
MODE = GND, MAXM17906
MODE = unconnected, MAXM17906
MODE = GND, MAXM17904
MODE = unconnected, MAXM17904
MODE = GND, MAXM17905
MODE = unconnected, MAXM17905
MAXM17906
0.887
0.887
3.25
3.25
4.93
4.93
-100
0.90
0.915
3.30
3.35
5.00
5.08
-25
0.913
0.936
3.35
3.42
5.07
5.18
FB-Regulation Voltage
V
V
FB-REG
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
RESET
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 Rising Threshold
1.9
ms
V
0.2
0.1
I
= 5mA
RESET Output-Level Low
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.
Maxim Integrated
│ 3
www.maximintegrated.com
MAXM17904/MAXM17905/
MAXM17906
4.5V to 24V, 300mA Himalaya uSLIC
Step-Down Power Module
Typical Operating Characteristics
(V = V
= 12V, V
= 0V, T = -40°C to +125°C, unless otherwise noted. Typical values are at T = +25°C. All voltages are
IN
EN/UVLO
GND A A
referenced to GND, unless otherwise noted. The circuit values for different output-voltage applications are as in Table 1, unless other-
wise noted.)
MAXM17906
EFFICIENCY vs. LOAD CURRENT
MAXM17906
EFFICIENCY vs. LOAD CURRENT
MAXM17906
EFFICIENCY vs. LOAD CURRENT
ADJUSTABLE VOUT = 0.9V, PWM MODE
ADJUSTABLE VOUT = 2.5V, PWM MODE
ADJUSTABLE VOUT = 1.5V, PWM MODE
toc03
toc01
toc02
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 = 5V
VIN = 5V
VIN = 5V
VIN = 12V
VIN = 20V
VIN = 12V
VIN = 20V
VIN = 12V
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)
0
30 60 90 120 150 180 210 240 270 300
LOAD CURRENT (mA)
MAXM17906
EFFICIENCY vs. LOAD CURRENT
MAXM17906
EFFICIENCY vs. LOAD CURRENT
MAXM17906
EFFICIENCY vs. LOAD CURRENT
ADJUSTABLE VOUT = 3.3V, PWM MODE
ADJUSTABLE VOUT = 5V, PWM MODE
ADJUSTABLE VOUT = 6.3V, PWM MODE
toc04
toc05
toc06
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 = 5.5V
VIN = 12V
VIN = 12V
VIN = 20V
VIN = 12V
VIN = 20V
VIN = 20V
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)
0
30 60 90 120 150 180 210 240 270 300
LOAD CURRENT (mA)
MAXM17906
EFFICIENCY vs. LOAD CURRENT
ADJUSTABLE VOUT = 0.9V, PFM MODE
MAXM17904
EFFICIENCY vs. LOAD CURRENT
FIXED VOUT = 3.3V, PWM MODE
MAXM17905
EFFICIENCY vs. LOAD CURRENT
FIXED VOUT = 5V, PWM MODE
toc09
toc07
toc08
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 = 5V
VIN = 5.5V
VIN = 12V
VIN = 20V
VIN = 12V
VIN = 20V
VIN = 12V
0
30 60 90 120 150 180 210 240 270 300
LOAD CURRENT (mA)
1
10
100
0
30 60 90 120 150 180 210 240 270 300
LOAD CURRENT (mA)
LOAD CURRENT (mA)
Maxim Integrated
│ 4
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MAXM17904/MAXM17905/
MAXM17906
4.5V to 24V, 300mA Himalaya uSLIC
Step-Down Power Module
Typical Operating Characteristics (continued)
(V = V
= 12V, V
= 0V, T = -40°C to +125°C, unless otherwise noted. Typical values are at T = +25°C. All voltages are
IN
EN/UVLO
GND A A
referenced to GND, unless otherwise noted. The circuit values for different output-voltage applications are as in Table 1, unless other-
wise noted.)
MAXM17906
MAXM17906
MAXM17906
EFFICIENCY vs. LOAD CURRENT
EFFICIENCY vs
.
LOAD CURRENT
EFFICIENCY vs
.
LOAD CURRENT
ADJUSTABLE VOUT = 3.3V, PFM MODE
ADJUSTABLE VOUT = 1.5V, PFM MODE
ADJUSTABLE VOUT = 2.5V, PFM MODE
toc10
toc11
toc12
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 = 5.5V
VIN = 5V
VIN = 5V
VIN =12V
VIN = 20V
VIN = 12V
VIN = 20V
VIN = 20V
VIN = 12V
1
10
100
1
10
100
1
10
100
LOAD CURRENT (mA)
LOAD CURRENT (mA)
LOAD CURRENT (mA)
MAXM17906
EFFICIENCY vs. LOAD CURRENT
ADJUSTABLE VOUT = 5V, PFM MODE
MAXM17906
EFFICIENCY vs. LOAD CURRENT
ADJUSTABLE VOUT = 6.3V, PFM MODE
MAXM17904
EFFICIENCY vs. LOAD CURRENT
FIXED VOUT = 3.3V, PFM MODE
toc15
toc13
toc14
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 = 5.5V
VIN = 20V
VIN = 12V
VIN = 20V
VIN = 12V
VIN = 20V
VIN = 12V
1
10
100
1
10
100
1
10
LOAD CURRENT (mA)
100
LOAD CURRENT (mA)
LOAD CURRENT (mA)
MAXM17906
OUTPUT VOLTAGEvs. LOAD CURRENT
ADJUSTABLE VOUT = 1.5V, PWM MODE
MAXM17905
EFFICIENCY vs. LOAD CURRENT
FIXED VOUT = 5V, PFM MODE
MAXM17906
OUTPUT VOLTAGEvs. LOAD CURRENT
ADJUSTABLE VOUT = 0.9V, PWM MODE
toc18
toc16
toc17
1.500
1.498
1.496
1.494
1.492
1.490
1.488
1.486
1.484
100
90
80
70
60
50
40
30
20
10
0
0.904
0.903
0.902
0.901
0.900
0.899
0.898
0.897
0.896
VIN = 5V
VIN = 5V
VIN = 12V
VIN = 20V
VIN = 12V
VIN = 20V
VIN = 12V
1
10
100
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)
LOAD CURRENT (mA)
Maxim Integrated
│ 5
www.maximintegrated.com
MAXM17904/MAXM17905/
MAXM17906
4.5V to 24V, 300mA Himalaya uSLIC
Step-Down Power Module
Typical Operating Characteristics (continued)
(V = V
= 12V, V
= 0V, T = -40°C to +125°C, unless otherwise noted. Typical values are at T = +25°C. All voltages are
IN
EN/UVLO
GND A A
referenced to GND, unless otherwise noted. The circuit values for different output-voltage applications are as in Table 1, unless other-
wise noted.)
MAXM17906
MAXM17906
MAXM17906
OUTPUT VOLTAGEvs. LOAD CURRENT
OUTPUT VOLTAGEvs
.
LOAD CURRENT
OUTPUT VOLTAGEvs
.
LOAD CURRENT
ADJUSTABLE VOUT = 3.3V, PWM MODE
ADJUSTABLE VOUT = 2.5V, PWM MODE
ADJUSTABLE VOUT = 5V, PWM MODE
toc20
toc21
toc19
3.300
3.292
3.284
3.276
3.268
3.260
3.252
3.244
3.236
3.228
5.10
5.08
5.06
5.04
5.02
5.00
2.504
2.498
2.492
2.486
2.480
2.474
2.468
2.462
2.456
2.450
VIN = 12V
VIN = 20V
V
IN = 5.5V
VIN = 12V
VIN = 12V
VIN = 20V
VIN = 20V
VIN = 5V
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)
0
30 60 90 120 150 180 210 240 270 300
LOAD CURRENT (mA)
MAXM17906
OUTPUT VOLTAGEvs. LOAD CURRENT
ADJUSTABLE VOUT = 6.3V, PWM MODE
MAXM17905
MAXM17904
OUTPUT VOLTAGEvs. LOAD CURRENT
OUTPUT VOLTAGEvs
. LOAD CURRENT
FIXED VOUT = 3.3V, PWM MODE
FIXED VOUT = 5V, PWM MODE
toc23
toc22
toc24
3.306
3.304
3.302
3.300
3.298
3.296
3.294
6.40
6.38
6.36
6.34
6.32
6.30
6.28
6.26
6.24
6.22
6.20
5.004
5.002
5.000
4.998
4.996
4.994
VIN = 12V
VIN = 20V
VIN = 5.5V
VIN = 12V
VIN = 20V
VIN = 20V
VIN = 12V
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)
0
30 60 90 120 150 180 210 240 270 300
LOAD CURRENT (mA)
MAXM17906
OUTPUT VOLTAGEvs. LOAD CURRENT
MAXM17906
OUTPUT VOLTAGEvs. LOAD CURRENT
MAXM17906
OUTPUT VOLTAGEvs. LOAD CURRENT
ADJUSTABLE VOUT = 1.5V, PFM MODE
ADJUSTABLE VOUT = 0.9V, PFM MODE
ADJUSTABLE VOUT = 2.5V, PFM MODE
toc26
toc25
toc27
1.55
1.54
1.53
1.52
1.51
1.50
1.49
1.48
2.58
2.56
2.54
2.52
2.50
2.48
2.46
2.44
0.934
0.925
0.916
0.907
0.898
0.889
0.880
VIN = 5V
VIN = 5V
VIN =12V
VIN = 20V
VIN =12V
VIN = 20V
VIN =12V
VIN = 5V
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)
0
30 60 90 120 150 180 210 240 270 300
LOAD CURRENT (mA)
Maxim Integrated
│ 6
www.maximintegrated.com
MAXM17904/MAXM17905/
MAXM17906
4.5V to 24V, 300mA Himalaya uSLIC
Step-Down Power Module
Typical Operating Characteristics (continued)
(V = V
= 12V, V
= 0V, T = -40°C to +125°C, unless otherwise noted. Typical values are at T = +25°C. All voltages are
IN
EN/UVLO
GND A A
referenced to GND, unless otherwise noted. The circuit values for different output-voltage applications are as in Table 1, unless other-
wise noted.)
MAXM17906
MAXM17906
MAXM17906
OUTPUT VOLTAGEvs. LOAD CURRENT
OUTPUT VOLTAGEvs
.
LOAD CURRENT
OUTPUT VOLTAGEvs
.
LOAD CURRENT
ADJUSTABLE VOUT = 3.3V, PFM MODE
ADJUSTABLE VOUT = 5V, PFM MODE
ADJUSTABLE VOUT = 6.3V, PFM MODE
toc28
toc29
toc30
5.20
5.18
5.16
5.14
5.12
5.10
5.08
5.06
5.04
5.02
5.00
6.50
6.47
6.44
6.41
6.38
6.35
6.32
6.29
6.26
6.23
6.20
3.39
3.37
3.35
3.33
3.31
3.29
3.27
3.25
VIN = 20V
VIN = 12V
VIN = 20V
VIN = 20V
VIN = 12V
VIN = 5.5V
VIN =12V
0
30 60 90 120 150 180 210 240 270 300
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)
LOAD CURRENT (mA)
MAXM17904
OUTPUT VOLTAGEvs. LOAD CURRENT
MAXM17905
OUTPUT VOLTAGEvs. LOAD CURRENT
MAXM17906 OUTPUT VOLTAGE RIPPLE
VIN = 12V, ADJUSTABLE VOUT = 1.5V,
FIXED VOUT = 3.3V, PFM MODE
FIXED VOUT = 5V, PFM MODE
FULL LOAD, PWM MODE
toc31
toc32
toc33
3.39
3.37
3.35
3.33
3.31
3.29
3.27
3.25
5.110
5.085
5.060
5.035
5.010
4.985
4.960
VIN = 20V
VIN = 12V
VIN = 20V
VIN = 12V
VIN = 5.5V
10mV/div
VOUT(AC)
2µs/div
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)
MAXM17906 OUTPUT VOLTAGE RIPPLE
VIN = 12V, ADJUSTABLE VOUT = 3.3V,
MAXM17904 OUTPUT VOLTAGE RIPPLE
VIN = 12V, FIXED VOUT = 3.3V,
FULL LOAD, PWM MODE
MAXM17906 OUTPUT VOLTAGE RIPPLE
VIN = 12V, ADJUSTABLE VOUT = 5V,
FULL LOAD, PWM MODE
FULL LOAD, PWM MODE
toc34
toc36
toc35
VOUT(AC)
10mV/div
VOUT(AC)
10mV/div
VOUT(AC)
10mV/div
2µs/div
2µs/div
2µs/div
Maxim Integrated
│ 7
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MAXM17904/MAXM17905/
MAXM17906
4.5V to 24V, 300mA Himalaya uSLIC
Step-Down Power Module
Typical Operating Characteristics (continued)
(V = V
= 12V, V
= 0V, T = -40°C to +125°C, unless otherwise noted. Typical values are at T = +25°C. All voltages are
IN
EN/UVLO
GND A A
referenced to GND, unless otherwise noted. The circuit values for different output-voltage applications are as in Table 1, unless other-
wise noted.)
MAXM17905 OUTPUT VOLTAGE RIPPLE
VIN = 12V, FIXED VOUT = 5V
MAXM17906 INPUT VOLTAGE RIPPLE
VIN = 12V, ADJUSTABLE VOUT = 1.5V
FULL LOAD, PWM MODE
MAXM17906 INPUT VOLTAGE RIPPLE
VIN = 12V, ADJUSTABLE VOUT = 3.3V,
FULL LOAD, PWM MODE
FULL LOAD, PWM MODE
toc37
toc38
toc39
VIN(AC)
50mV/div
VIN(AC)
50mV/div
VOUT(AC)
10mV/div
2µs/div
2µs/div
2µs/div
MAXM17905 INPUT VOLTAGE RIPPLE
VIN = 12V, FIXED VOUT = 5V
MAXM17904 INPUT VOLTAGE RIPPLE
VIN = 12V, FIXED VOUT = 3.3V,
FULL LOAD, PWM MODE
MAXM17906 INPUT VOLTAGE RIPPLE
VIN = 12V, ADJUSTABLE VOUT = 5V,
FULL LOAD, PWM MODE
FULL LOAD, PWM MODE
toc40
toc42
toc41
100mV/div
VIN(AC)
50mV/div
VIN(AC)
VIN(AC)
100mV/div
2µs/div
2µs/div
2µs/div
MAXM17906 LOAD TRANSIENT RESPONSE
VIN = 12V, ADJUSTABLE VOUT = 1.5V, PWM MODE
MAXM17906 LOAD TRANSIENT RESPONSE
VIN = 12V, ADJUSTABLE VOUT = 3.3V, PFM MODE
MAXM17906 LOAD TRANSIENT RESPONSE
VIN = 12V, ADJUSTABLE VOUT = 1.5V, PFM MODE
(LOAD CURRENT STEPPED FROM 5mA to 150 A)
(LOAD CURRENT STEPPED FROM 150mA TO 300mA)
(LOAD CURRENT STEPPED FROM 5mA TO 150mA)
m
toc43
toc45
toc44
VOUT(AC)
50mV/div
VOUT(AC)
50mV/div
100mV/div
VOUT(AC)
100mA/div
IOUT
IOUT
100mA/div
IOUT
100mA/div
100µs/div
100µs/div
100µs/div
Maxim Integrated
│ 8
www.maximintegrated.com
MAXM17904/MAXM17905/
MAXM17906
4.5V to 24V, 300mA Himalaya uSLIC
Step-Down Power Module
Typical Operating Characteristics (continued)
(V = V
= 12V, V
= 0V, T = -40°C to +125°C, unless otherwise noted. Typical values are at T = +25°C. All voltages are
IN
EN/UVLO
GND A A
referenced to GND, unless otherwise noted. The circuit values for different output-voltage applications are as in Table 1, unless other-
wise noted.)
MAXM17906 LOAD TRANSIENT RESPONSE
VIN=12V, ADJUSTABLE VOUT = 3.3V, PWM MODE
MAXM17906 LOAD TRANSIENT RESPONSE
VIN = 12V, ADJUSTABLE VOUT = 5V, PFM MODE
MAXM17906 LOAD TRANSIENT RESPONSE
VIN = 12V, ADJUSTABLE VOUT = 5V, PWM MODE
(LOAD CURRENT STEPPED FROM 150mA TO 300mA)
(LOAD CURRENT STEPPED FROM 5mA TO 150mA)
(LOAD CURRENT STEPPED FROM 150mA TO 300mA)
toc46
toc48
toc47
VOUT(AC)
100mV/div
VOUT(AC)
100mV/div
100mA/div
200mV/div
VOUT(AC)
IOUT
100mA/div
100mA/div
IOUT
IOUT
100µs/div
100µs/div
100µs/div
MAXM17904 LOAD TRANSIENT RESPONSE
VIN = 12V, FIXED VOUT = 3.3V, PFM MODE
MAXM17904 LOAD TRANSIENT RESPONSE
VIN = 12V, FIXED VOUT = 3.3V, PWM MODE
MAXM17905 LOAD TRANSIENT RESPONSE
VIN = 12V, FIXED VOUT = 5V, PFM MODE
(LOAD CURRENT STEPPED FROM 5mA TO 150mA)
(LOAD CURRENT STEPPED FROM 150mA TO 300mA)
(LOAD CURRENT STEPPED FROM 5mA TO 150mA)
toc49
toc50
toc51
VOUT(AC)
100mV/div
100mA/div
100mV/div
200mV/div
VOUT(AC)
VOUT(AC)
IOUT
IOUT
100mA/div
IOUT
100mA/div
100µs/div
100µs/div
100µs/div
MAXM17905 LOAD TRANSIENT RESPONSE
VIN = 12V, FIXED VOUT = 5V, PWM MODE
MAXM17906 STARTUP THROUGH ENABLE
MAXM17906 SHUTDOWN THROUGH ENABLE
VIN = 12V, ADJUSTABLE VOUT = 1.5V,
VIN = 12V, ADJUSTABLE VOUT = 1.5V,
FULL LOAD, PWM MODE
(LOAD CURRENT STEPPED FROM 150mA TO 300mA)
FULL LOAD, PWM MODE
toc52
toc53
toc54
5V/div
VOUT(AC)
100mV/div
100mA/div
5V/div
EN/UVLO
LX
EN/UVLO
LX
10V/div
1V/div
10V/div
1V/div
5V/div
5V/div
VOUT
VOUT
RESET
IOUT
RESET
100µs/div
1ms/div
100µs/div
Maxim Integrated
│ 9
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MAXM17904/MAXM17905/
MAXM17906
4.5V to 24V, 300mA Himalaya uSLIC
Step-Down Power Module
Typical Operating Characteristics (continued)
(V = V
= 12V, V
= 0V, T = -40°C to +125°C, unless otherwise noted. Typical values are at T = +25°C. All voltages are
IN
EN/UVLO
GND A A
referenced to GND, unless otherwise noted. The circuit values for different output-voltage applications are as in Table 1, unless other-
wise noted.)
MAXM17906 STARTUP THROUGH ENABLE
VIN = 12V, ADJUSTABLE VOUT = 3.3V,
MAXM17906 SHUTDOWN THROUGH ENABLE
VIN = 12V, ADJUSTABLE VOUT = 3.3V,
MAXM17906 STARTUP THROUGH ENABLE: 2V PREBIAS
VIN = 12V, ADJUSTABLE VOUT = 3.3V,
FULL LOAD, PWM MODE
FULL LOAD, PWM MODE
NO LOAD, PWM MODE
toc57
toc55
toc56
5V/div
5V/div
EN/UVLO
EN/UVLO
LX
EN/UVLO
LX
5V/div
LX
10V/div
2V/div
10V/div
10V/div
2V/div
VOUT
5V/div
VOUT
5V/div
2V/div
5V/div
VOUT
RESET
RESET
RESET
1ms/div
1ms/div
100µs/div
MAXM17906 STARTUP THROUGH ENABLE: 2V PREBIAS
VIN = 12V, ADJUSTABLE VOUT = 3.3V,
MAXM17906 STARTUP THROUGH ENABLE
VIN = 12V, ADJUSTABLE VOUT = 5V,
MAXM17906 SHUTDOWN THROUGH ENABLE
VIN = 12V, ADJUSTABLE VOUT = 5V,
NO LOAD, PFM MODE
FULL LOAD, PWM MODE
FULL LOAD, PWM MODE
toc59
toc60
toc58
5V/div
5V/div
EN/UVLO
LX
EN/UVLO
LX
5V/div
EN/UVLO
10V/div
10V/div
2V/div
LX
10V/div
2V/div
VOUT
VOUT
2V/div
5V/div
VOUT
5V/div
5V/div
RESET
RESET
RESET
100µs/div
1ms/div
1ms/div
MAXM17904 STARTUP THROUGH ENABLE
VIN = 12V, FIXED VOUT = 3.3V,
MAXM17904 STARTUP THROUGH ENABLE: 2V PREBIAS
VIN = 12V, FIXED VOUT = 3.3V,
MAXM17904 SHUTDOWN THROUGH ENABLE
VIN = 12V, FIXED VOUT = 3.3V,
FULL LOAD, PWM MODE
NO LOAD, PWM MODE
FULL LOAD, PWM MODE
toc63
toc61
toc62
5V/div
5V/div
EN/UVLO
EN/UVLO
LX
5V/div
EN/UVLO
LX
LX
10V/div
2V/div
5V/div
10V/div
10V/div
2V/div
VOUT
VOUT
5V/div
2V/div
5V/div
VOUT
RESET
RESET
RESET
1ms/div
1ms/div
100µs/div
Maxim Integrated
│ 10
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MAXM17904/MAXM17905/
MAXM17906
4.5V to 24V, 300mA Himalaya uSLIC
Step-Down Power Module
Typical Operating Characteristics (continued)
(V = V
= 12V, V
= 0V, T = -40°C to +125°C, unless otherwise noted. Typical values are at T = +25°C. All voltages are
IN
EN/UVLO
GND A A
referenced to GND, unless otherwise noted. The circuit values for different output-voltage applications are as in Table 1, unless other-
wise noted.)
MAXM17905 STARTUP THROUGH ENABLE
VIN = 12V, FIXED VOUT = 5V,
MAXM17905 SHUTDOWN THROUGH ENABLE
VIN = 12V, FIXED VOUT = 5V,
MAXM17904 STARTUP THROUGH ENABLE: 2V PREBIAS
VIN = 12V, FIXED VOUT = 3.3V,
FULL LOAD, PWM MODE
FULL LOAD, PWM MODE
NO LOAD, PFM MODE
toc64
toc66
toc65
5V/div
5V/div
EN/UVLO
LX
EN/UVLO
LX
5V/div
EN/UVLO
10V/div
2V/div
10V/div
LX
10V/div
2V/div
2V/div
5V/div
VOUT
VOUT
VOUT
5V/div
5V/div
RESET
RESET
RESET
100µs/div
1ms/div
1ms/div
MAXM17905 STARTUP THROUGH ENABLE: 2.5V PREBIAS
VIN = 12V, FIXED VOUT = 5V,
MAXM17905 STARTUP THROUGH ENABLE: 2.5V PREBIAS
VIN = 12V, FIXED VOUT = 5V,
MAXM17906 STARTUP THROUGH VIN
VIN = 12V, ADJUSTABLE VOUT = 1.5V,
FULL LOAD, PWM MODE
NO LOAD, PFM MODE
NO LOAD, PWM MODE
toc67
toc68
toc69
10V/div
5V/div
5V/div
EN/UVLO
VIN
LX
EN/UVLO
10V/div
10V/div
2V/div
LX
LX
10V/div
2V/div
2V/div
500mV/div
VCC
VOUT
VOUT
5V/div
5V/div
VOUT
RESET
RESET
1ms/div
1ms/div
1ms/div
MAXM17906 SHUTDOWN THROUGH VIN
VIN = 12V, ADJUSTABLE VOUT = 1.5V,
FULL LOAD, PWM MODE
MAXM17906 STARTUP THROUGH VIN
VIN = 12V,ADJUSTABLE VOUT = 3.3V,
FULL LOAD, PWM MODE
MAXM17906 SHUTDOWN THROUGH VIN
VIN = 12V, ADJUSTABLE VOUT = 3.3V,
FULL LOAD, PWM MODE
toc71
toc70
toc72
10V/div
10V/div
10V/div
VIN
LX
VIN
LX
VIN
LX
10V/div
10V/div
10V/div
2V/div
1V/div
2V/div
VCC
VCC
2V/div
1V/div
VCC
VOUT
500mV/div
VOUT
VOUT
1ms/div
1ms/div
1ms/div
Maxim Integrated
│ 11
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MAXM17904/MAXM17905/
MAXM17906
4.5V to 24V, 300mA Himalaya uSLIC
Step-Down Power Module
Typical Operating Characteristics (continued)
(V = V
= 12V, V
= 0V, T = -40°C to +125°C, unless otherwise noted. Typical values are at T = +25°C. All voltages are
IN
EN/UVLO
GND A A
referenced to GND, unless otherwise noted. The circuit values for different output-voltage applications are as in Table 1, unless other-
wise noted.)
MAXM17906 SHUTDOWN THROUGH VIN
VIN = 12V, ADJUSTABLE VOUT = 5V,
MAXM17906 STARTUP THROUGH VIN
MAXM17904 STARTUP THROUGH VIN
VIN = 12V, FIXED VOUT = 3.3V,
FULL LOAD, PWM MODE
VIN = 12V, ADJUSTABLE VOUT = 5V,
FULL LOAD, PWM MODE
FULL LOAD, PWM MODE
toc73
toc74
toc75
10V/div
10V/div
10V/div
10V/div
VIN
LX
VIN
LX
VIN
LX
10V/div
2V/div
10V/div
2V/div
2V/div
1V/div
VCC
2V/div
2V/div
VCC
VCC
VOUT
VOUT
VOUT
1ms/div
1ms/div
1ms/div
MAXM17905 STARTUP THROUGH VIN
MAXM17905 SHUTDOWN THROUGH VIN
MAXM17904 SHUTDOWN THROUGH VIN
VIN = 12V, FIXED VOUT = 3.3V,
FULL LOAD, PWM MODE
VIN = 12V, FIXED VOUT = 5V,
FULL LOAD, PWM MODE
VIN = 12V, FIXED VOUT = 5V,
FULL LOAD, PWM MODE
toc77
toc78
toc76
10V/div
VIN
LX
10V/div
10V/div
VIN
LX
VIN
LX
10V/div
10V/div
10V/div
2V/div
2V/div
VCC
2V/div
2V/div
2V/div
1V/div
VCC
VCC
VOUT
VOUT
VOUT
1ms/div
1ms/div
1ms/div
MAXM17906 OUTPUT SHORT DURING STARTUP
VIN = 12V, ADJUSTABLE VOUT = 3.3V,
MAXM17906 OUTPUT SHORT IN STEADY STATE
VIN = 12V, ADJUSTABLE VOUT = 3.3V,
MAXM17904 OUTPUT SHORT IN STEADY STATE
VIN = 12V, FIXED VOUT = 3.3V,
FULL LOAD, PWM MODE
FULL LOAD, PWM MODE
FULL LOAD, PWM MODE
toc80
toc79
toc81
10V/div
5V/div
5V/div
VIN
SHORT
SHORT
VOUT
VOUT
2V/div
VOUT
2V/div
20mV/div
10V/div
LX
LX
10V/div
LX
10V/div
IOUT
500mA/div
500mA/div
IOUT
IOUT
10mA/div
20ms/div
20ms/div
20ms/div
Maxim Integrated
│ 12
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MAXM17904/MAXM17905/
MAXM17906
4.5V to 24V, 300mA Himalaya uSLIC
Step-Down Power Module
Typical Operating Characteristics (continued)
(V = V
= 12V, V
= 0V, T = -40°C to +125°C, unless otherwise noted. Typical values are at T = +25°C. All voltages are
IN
EN/UVLO
GND A A
referenced to GND, unless otherwise noted. The circuit values for different output-voltage applications are as in Table 1, unless other-
wise noted.)
MAXM17904 OUTPUT SHORT DURING STARTUP
VIN = 12V, FIXED VOUT = 3.3V,
MAXM17905 OUTPUT SHORT IN STEADY STATE
VIN = 12V, FIXED VOUT = 5V,
FULL LOAD, PWM MODE
FULL LOAD, PWM MODE
toc83
toc82
10V/div
5V/div
VIN
SHORT
VOUT
20mV/div
5V/div
VOUT
LX
LX
10V/div
10V/div
IOUT
10mA/div
IOUT
500mA/div
20ms/div
20ms/div
MAXM17905 OUTPUT SHORT DURING STARTUP
VIN = 12V, FIXED VOUT = 5V,
MAXM17906 BODE PLOT
VIN = 12V, ADJUSTABLE VOUT = 1.5V,
FULL LOAD, PWM MODE
FULL LOAD, PWM MODE
toc85
toc84
100
80
100
80
10V/div
PHASE
VIN
60
60
40
40
20mV/div
VOUT
20
20
0
0
GAIN
-20
-40
-60
-80
-20
-40
-60
-80
10V/div
LX
10mA/div
CROSSOVER FREQUENCY = 49.294kHz
PHASE MARGIN = 46.203◦
IOUT
20ms/div
1k
10k
100k
FREQUENCY (Hz)
MAXM17906 BODE PLOT
VIN = 12V, ADJUSTABLE VOUT = 3.3V,
FULL LOAD, PWM MODE
MAXM17906 BODE PLOT
VIN = 12V, ADJUSTABLE VOUT = 5V,
FULL LOAD, PWM MODE
toc86
toc87
100
80
100
80
100
80
100
80
PHASE
PHASE
60
60
60
60
40
40
40
40
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 = 47.884kHz
PHASE MARGIN = 46.966◦
CROSSOVER FREQUENCY = 39.06kHz
PHASE MARGIN = 52.844◦
1k
10k
100k
1k
10k
100k
FREQUENCY (Hz)
FREQUENCY (Hz)
Maxim Integrated
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MAXM17904/MAXM17905/
MAXM17906
4.5V to 24V, 300mA Himalaya uSLIC
Step-Down Power Module
Typical Operating Characteristics (continued)
(V = V
= 12V, V
= 0V, T = -40°C to +125°C, unless otherwise noted. Typical values are at T = +25°C. All voltages are
IN
EN/UVLO
GND A A
referenced to GND, unless otherwise noted. The circuit values for different output-voltage applications are as in Table 1, unless other-
wise noted.)
MAXM17904 BODE PLOT
VIN = 12V, FIXED VOUT = 3.3V,
FULL LOAD, PWM MODE
MAXM17905 BODE PLOT
VIN = 12V, FIXED VOUT = 5V,
FULL LOAD, PWM MODE
toc88
toc89
100
80
100
80
100
80
100
80
PHASE
PHASE
60
60
60
60
40
40
40
40
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 = 45.195kHz
PHASE MARGIN = 53.093◦
CROSSOVER FREQUENCY = 49.639kHz
PHASE MARGIN = 56.096◦
1k
10k
100k
1k
10k
100k
FREQUENCY (Hz)
FREQUENCY (Hz)
MAXM17904/5
MAXM17906
OUTPUT CURRENT vs. AMBIENT TEMPERATURE
OUTPUT CURRENT vs. AMBIENT TEMPERATURE
toc90
toc91
350
350
300
250
200
150
100
50
300
250
200
150
100
50
FIXED VOUT = 3.3V
ADJUSTABLE VOU T = 2.5V
FIXED VOUT = 5V
0
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
toc92
toc93
50
CISPR-22 CLASS B QP LIMIT
60
CISPR-22 CLASS B QP LIMIT
40
30
20
CISPR-22 CLASS B AVG LIMIT
50
40
VERTICAL
SCAN
30
PEAK
EMISSION
10
0
20
10
AVERAGE
EMISSION
HORIZONTAL
SCAN
-10
150k
1M
10M
100M
30M
1G
FREQUENCY(Hz)
FREQUENCY(Hz)
CONDITIONS : VIN = 12V, VOU T = 5V, IOU T = 0.3A
CONDITIONS : VIN = 12V, VOU T = 5V, IOU T = 0.3A
Maxim Integrated
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MAXM17904/MAXM17905/
MAXM17906
4.5V to 24V, 300mA Himalaya uSLIC
Step-Down Power Module
Pin Configuration
TOP VIEW
+
LX
GND
1
2
3
4
5
10
9
V
V
IN
IN
MAXM17904
MAXM17905
MAXM17906
RESET
MODE
OUT
8
EN/UVLO
7
V
CC
6
FB
‘+’ INDICATES PIN 1 OF THE MODULE
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 MAXM17906 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
Module Output Pin. Connect a capacitor from OUT to GND. See the PCB Layout Guidelines section for
more details.
Output Feedback Connection. Connect FB to a resistor-divider between OUT and GND to set the output
6
7
8
FB
voltage for MAXM17906. Connect to output voltage node (V
See Output-Voltage Setting section for more details.
) for MAXM17904 and MAXM17905.
OUT
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.
EN/UVLO Connect EN/UVLO to V for always-on operation. Connect a resistor-divider between V , EN/UVLO,
IN
IN
and 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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MAXM17904/MAXM17905/
MAXM17906
4.5V to 24V, 300mA Himalaya uSLIC
Step-Down Power Module
Functional Diagram
Internal Diagram
MAXM17904/MAXM17905/
MAXM17906
V
V
IN
CC
LDO
HIGH-SIDE
DRIVER
EN/UVLO
LX
1.215V
33µH
LOW-SIDE
DRIVER
OUT
PEAK
CURRENT-MODE
CONTROLLER
OSCILLATOR
SOFT-START
GND
MODE
SELECTION
LOGIC
SLOPE
COMPENSATION
MODE
*S1
R3
RESET
*S2
RESET
LOGIC
FB
R4
*REFER TO TABLE A
Table A
MODULE PART NUMBER
MAXM17906
S1
S2
R3 (KΩ)
OPEN
R4 (KΩ)
CLOSE
OPEN
OPEN
OPEN
CLOSE
CLOSE
OPEN
77
MAXM17904
205.33
350.80
MAXM17905
77
Maxim Integrated
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MAXM17904/MAXM17905/
MAXM17906
4.5V to 24V, 300mA Himalaya uSLIC
Step-Down Power Module
operation at all loads. However, PWM-mode of operation
gives lower efficiency at light loads compared to PFM-
mode of operation.
Detailed Description
The MAXM17904/MAXM17905/MAXM17906 are
a
family of high-efficiency, synchronous step-down DC-DC
modules with integrated controller, MOSFETs, compen-
sation components, and inductor that operate over a
wide input-voltage range. The modules deliver an output
current up to 300mA. The MAXM17904 and MAXM17905
are fixed 3.3V and 5V output modules respectively. The
MAXM17906 is an adjustable output (0.9V to 6.3V)
module. When EN/UVLO and V
an internal power-up sequence ramps up the error-amplifier
reference, resulting in an output-voltage soft-start.
PFM Operation
PFM mode operation disables negative output current
from the module, and skips pulses at light loads for bet-
ter 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 cur-
rent 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.
UVLO are ascertained,
CC
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 devices select 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 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 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 ) should be bypassed
CC
with a 1μF ceramic capacitor to GND. The V
regula-
CC
tor dropout voltage is typically 150mV. An undervoltage
lockout circuit that disables the buck converter when V
CC
falls below 3.8V (typ). The 400mV, V -UVLO hysteresis
CC
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 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 con-
stant-frequency PWM mode at all loads. State changes
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 Operation
In PWM mode, the module output current is allowed to
go negative. PWM operation is useful in frequency sensi-
tive applications and provides fixed switching frequency
UVLO to V (see the Electrical Characteristics table for
IN
EN/UVLO rising and falling threshold voltages).
Maxim Integrated
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MAXM17904/MAXM17905/
MAXM17906
4.5V to 24V, 300mA Himalaya uSLIC
Step-Down Power Module
RESET Output (RESET)
Thermal Overload Protection
The devices include 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.
Thermal overload protection limits the total power dis-
sipation 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.
Startup into a Prebiased Output
Applications Information
The devices are 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.
Input-Voltage Range
The minimum and maximum operating input voltages for
a given output voltage should be calculated as follows:
V
+ I
× 3.05
(
)
OUT
OUT
MAX
Overcurrent Protection (OCP)/Hiccup Mode
V
=
+ I
(
×1.8
OUT
)
IN(MIN)
D
The MAXM17904/MAXM17905/MAXM17906 are pro-
vided 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 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 overload or
short-circuit conditions. Once the hiccup timeout period
expires, soft-start is attempted again.
V
OUT
V
=
IN(MAX)
t
× f
ON(MIN) SW
where:
V
I
= Steady-state output voltage,
= Maximum load current,
OUT
OUT
f
= Worst-case switching frequency(585000 Hz),
SW
D
= Maximum duty cycle (0.89),
MAX
t
= Worst-case minimum controllable switch on-
ON(MIN)
time (120ns).
The MAXM17904/5/6 are designed to support a maximum
load current of 300mA. The inductor ripple current is cal-
culated as follows:
Also, for duty cycle > 0.5;
V
> 2.67 × V
+ 9.91 × I - 9.8
OUT
IN(MIN)
OUT
For MAXM17904, V
For MAXM17905, V
= 5.5V, V
= 24V
= 24V
V
− V
− 4.85×I
V
+ 3.05×I
−1.8×I
OUT
IN(MIN)
IN(MAX)
IN
OUT
OUT
OUT
OUT
∆I =
×
L × f
V
= 7.5V, V
SW
IN
IN(MIN)
IN(MAX)
Where:
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.
V
V
= Steady-state output voltage
OUT
= Operating input voltage for given V
= Switching Frequency
IN
OUT
f
SW
The input capacitor RMS current requirement (I
defined by the following equation:
) is
RMS
L = Power module output inductance (33µH ±30%)
= Required output (load) current
I
OUT
V
× V − V
IN OUT
(
)
OUT
I
= I
×
OUT(MAX)
The following condition should be satisfied at the desired
load current, I
RMS
V
IN
.
OUT
where, I
is the maximum load current. I
has
RMS
OUT(MAX)
∆I
2
a maximum value when the input voltage equals twice the
I
+
< 0.49
OUT
output voltage (V = 2 x V
). So,
IN
OUT
I
OUT(MAX)
2
I
=
RMS(MAX)
Maxim Integrated
│ 18
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MAXM17904/MAXM17905/
MAXM17906
4.5V to 24V, 300mA Himalaya uSLIC
Step-Down Power Module
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-
perature stability. Calculate the input capacitance using
the following equation:
Setting the Input Undervoltage-Lockout Level
The devices offer an adjustable input undervoltage lock-
out level. Set the voltage at which the device turns on with
a resistive voltage-divider connected from V to GND
IN
(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
I
×D
× 1− D
(
)
OUT(MAX)
f
MAX
MAX
follows:
C
=
IN
R1×1.215
R2 =
× ∆V
SW
IN
V
−1.215
INU
where:
where V
to turn on.
is the voltage at which the device is required
D
= Maximum duty cycle(0.89),
INU
MAX
f
= Switching frequency,
SW
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 and the EN/UVLO pin, to reduce voltage ringing on
the line.
∆V = Allowable input-voltage ripple.
IN
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 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:
Output-Voltage Setting
The MAXM17906 output voltage can be programmed
from 0.9V to 6.3V. 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
OUT
R3 = R4×
−1
20
C
=
0.9
OUT
V
OUT
Connect FB of MAXM17904 and MAXM17905 directly to
for feedback control.
where C
is the output capacitance in μF and V
OUT
OUT
V
is the output voltage. Derating of ceramic capacitors with
DC-voltage must be considered while selecting the output
capacitor.
OUT
V
IN
OUT
MAXM17904
MAXM17905
MAXM17906
R1
R2
MAXM17906
R3
R4
FB
EN/UVLO
Figure 1. Adjustable EN/UVLO Network
Figure 2. Setting the Output Voltage
Maxim Integrated
│ 19
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MAXM17904/MAXM17905/
MAXM17906
4.5V to 24V, 300mA Himalaya uSLIC
Step-Down Power Module
Table 1. Selection of Components
PART
NUMBER
V
V
V
*
R3
(kΩ)
R4
(kΩ)
IN(MIN) IN(MAX) OUT
C
C
OUT
IN
(V)
(V)
(V)
1 x 1µF 0805 25V
(Murata GRM219R71E105KA88) (Murata GRM31CR70J226KE19L)
1 x 22µF 1206 6.3V
4.5
12.5
0.9
SHORT OPEN
1 x 1µF 0805 25V 1 x 22µF 1206 6.3V
(Murata GRM219R71E105KA88) (Murata GRM31CR70J226KE19L)
4.5
4.5
4.5
4.5
4.5
5.5
7.5
10
14
17
1
8.33
25
75
75
1 x 1µF 0805 25V 1 x 22µF 1206 6.3V
1.2
1.5
1.8
2.5
3.3
5
(Murata GRM219R71E105KA88) (Murata GRM31CR70J226KE19L)
1 x 1µF 0805 25V 1 x 10µF 1206 6.3V
21.5
24
50
75
(Murata GRM219R71E105KA88) (Murata GRM31CR70J106KA01)
1 x 1µF 0805 50V 1 x 10µF 1206 6.3V
MAXM17906
75
75
(Murata GRM21BR71H105KA12) (Murata GRM31CR70J106KA01)
1 x 1µF 0805 50V 1 x 10µF 0805 16V
24
133
200
348
450
N/A
N/A
75
(Murata GRM21BR71H105KA12) (Murata GRM21BZ71C106KE15)
1 x 1µF 0805 50V 1 x 10µF 0805 16V
24
75
(Murata GRM21BR71H105KA12) (Murata GRM21BZ71C106KE15)
1 x 1µF 0805 50V 1 x 10µF 0805 16V
24
75
(Murata GRM21BR71H105KA12) (Murata GRM21BZ71C106KE15)
1 x 1µF 0805 50V 1 x 10µF 0805 16V
24
6.3
3.3
5
75
(Murata GRM21BR71H105KA12) (Murata GRM21BZ71C106KE15)
1 x 1μF 0805 50V 1 x 10µF 0805 16V
MAXM17904
MAXM17905
5.5
7.5
24
N/A
N/A
(Murata GRM21BR71H105KA12) (Murata GRM21BZ71C106KE15)
1 x 1μF 0805 50V 1 x 10µF 0805 16V
(Murata GRM21BR71H105KA12) (Murata GRM21BZ71C106KE15)
24
* The modules have a pulse skip algorithm that allows V
to be regulated beyond the V
specified in the above table, up to 24V.
OUT
IN(MAX)
For the MAXM17904/MAXM17905/MAXM17906 evalu-
ation board, the thermal resistance from junction-to-
Power Dissipation
The power dissipation inside the module leads to
increase in the junction temperature of the MAXM17904/
MAXM17905/MAXM17906. The power loss inside the
module at full load can be estimated as follows:
ambient (θ ) is 41.56°C/W. Operating the module at
JA
junction temperatures greater than +125°C degrades
operating lifetimes. An EESIM model is available for the
MAXM17904/MAXM17905/MAXM17906 to simulate effi-
ciency and power loss for the desired operating conditions.
1
P
= P
×
−1
PCB Layout Guidelines
LOSS
OUT
η
Use the following guidelines for good PCB layout:
● Keep the input capacitors as close as possible to the
IN and GND pins.
Where η is the efficiency of the power module at the
desired operating conditions. The junction temperature
(T ) of the module can be estimated at any given maximum
ambient temperature (T ) from the following equation:
● Keep the output capacitors as close as possible to
J
the OUT and GND pins.
A
● Keep the resistive feedback dividers as close as
possible to the FB pin.
T = T + θ ×P
J
A
JA
LOSS
● Keep the power traces and load connections short.
Refer to the EV kit layout for first-pass success.
Maxim Integrated
│ 20
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MAXM17904/MAXM17905/
MAXM17906
4.5V to 24V, 300mA Himalaya uSLIC
Step-Down Power Module
V
V
IN
OUT
V
OUT
IN
C
C
OUT
IN
RESET
R3
R4
R1
R2
MAXM17906
EN/UVLO
FB
LX
V
CC
C
VCC
MODE
GND
CIN
V
IN
PLANE
GND PLANE
+
1
2
10
9
LX
V
V
IN
IN
MAXM17906
GND
R1
R2
EN/UVLO
VCC
8
7
3
4
RESET
MODE
OUT
5
6
C
VCC
FB
C
OUT
V
OUT
PLANE
GND PLANE
R3
R4
VIA TO INNER LAYER FOR ROUTING FB
Figure 3. Adjustable Output Layout Guidelines
Maxim Integrated
│ 21
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MAXM17904/MAXM17905/
MAXM17906
4.5V to 24V, 300mA Himalaya uSLIC
Step-Down Power Module
V
VOUT
IN
V
OUT
IN
C
C
OUT
IN
RESET
R1
R2
MAXM17904
MAXM17905
EN/UVLO
FB
LX
V
CC
C
VCC
MODE
GND
CIN
V
IN
PLANE
GND PLANE
+
1
2
10
9
LX
V
V
IN
IN
MAXM17904
MAXM17905
GND
RESET
MODE
OUT
R1
R2
EN/UVLO
VCC
8
7
3
4
5
6
C
VCC
FB
C
OUT
V
PLANE
OUT
GND PLANE
VIA TO INNER LAYER FOR ROUTING FB
Figure 4. Fixed Output Layout Guidelines
Maxim Integrated
│ 22
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MAXM17904/MAXM17905/
MAXM17906
4.5V to 24V, 300mA Himalaya uSLIC
Step-Down Power Module
Typical Application Circuits
Typical Application Circuit for Adjustable 3.3V Output
V
VOUT
IN
3.3V, 300mA
5.5V TO 24V
V
OUT
IN
C2
C1
1µF
10µF
R1
200kΩ
EN/UVLO
GND
MAXM17906
RESET
FB
R2
75kΩ
LX
V
CC
C3
1µF
MODE
MODE = GND FOR PWM
MODE = OPEN FOR PFM
C1 = MURATA 1μF/X7R/50V/0805 (GRM21BR71H105KA12L)
C2 = MURATA 10μF/X7R/16V/0805 (GRM21BZ71C106KE15)
C3 = MURATA 1μF/X7R/6.3V/0603 (GRM188R70J105K)
Typical Application Circuit for Adjustable 2.5V Output
V
VOUT
2.5V, 300mA
IN
4.5V TO 24V
V
OUT
GND
IN
C2
10µF
C1
1µF
R1
133kΩ
EN/UVLO
MAXM17906
RESET
FB
R2
75kΩ
LX
V
CC
C3
1µF
MODE
MODE = GND FOR PWM
MODE = OPEN FOR PFM
C1 = MURATA 1μF/X7R/50V/0805 (GRM21BR71H105KA12L)
C2 = MURATA 10μF/X7R/16V/0805 (GRM21BZ71C106KE15)
C3 = MURATA 1μF/X7R/6.3V/0603 (GRM188R70J105K)
Maxim Integrated
│ 23
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MAXM17904/MAXM17905/
MAXM17906
4.5V to 24V, 300mA Himalaya uSLIC
Step-Down Power Module
Typical Application Circuits (continued)
Typical Application Circuit for Adjustable 1.5V Output
V
VOUT
IN
1.5V, 300mA
4.5V TO 21.5V
V
OUT
IN
C2
C1
1µF
10µF
R1
50kΩ
EN/UVLO
GND
MAXM17906
RESET
FB
R2
75kΩ
LX
V
CC
C3
1µF
MODE
MODE = GND FOR PWM
MODE = OPEN FOR PFM
C1 = MURATA 1 F/X7R/25V/0805 (GRM219R71E105KA88D)
C2 = MURATA 10 F/X7R/6.3V/1206 (GRM31CR70J106KA01)
C3 = MURATA 1 F/X7R/6.3V/0603 (GRM188R70J105K)
Typical Application Circuit for Fixed 3.3V Output
V
VOUT
3.3V, 300mA
IN
5.5V TO 24V
V
OUT
GND
IN
C2
10µF
C1
1µF
EN/UVLO
MAXM17904
RESET
FB
LX
V
CC
C3
1µF
MODE
MODE = GND FOR PWM
MODE = OPEN FOR PFM
C1 = MURATA 1μF/X7R/50V/0805 (GRM21BR71H105KA12L)
C2 = MURATA 10μF/X7R/16V/0805 (GRM21BZ71C106KE15)
C3 = MURATA 1μF/X7R/6.3V/0603 (GRM188R70J105K)
Maxim Integrated
│ 24
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MAXM17904/MAXM17905/
MAXM17906
4.5V to 24V, 300mA Himalaya uSLIC
Step-Down Power Module
Typical Application Circuits (continued)
Typical Application Circuit for Fixed 5V Output
V
VOUT
IN
5V, 300mA
8.5V TO 24V
V
OUT
IN
C2
C1
10µF
EN/UVLO
1µF
GND
MAXM17906
RESET
FB
LX
V
CC
C3
1µF
MODE
MODE = GND FOR PWM
MODE = OPEN FOR PFM
C1 = MURATA 1μF/X7R/50V/0805 (GRM21BR71H105KA12L)
C2 = MURATA 10μF/X7R/16V/0805 (GRM21BZ71C106KE15)
C3 = MURATA 1μF/X7R/6.3V/0603 (GRM188R70J105K)
Ordering Information
PART
NUMBER
TEMP
RANGE
PIN-PACKAGE
MAXM17904AMB+
-40°C to +125°C
10-pin uSLIC
10-pin uSLIC
10-pin uSLIC
10-pin uSLIC
10-pin uSLIC
10-pin uSLIC
MAXM17904AMB+T -40°C to +125°C
MAXM17905AMB+ -40°C to +125°C
MAXM17905AMB+T -40°C to +125°C
MAXM17906AMB+ -40°C to +125°C
MAXM17906AMB+T -40°C to +125°C
+ Denotes a lead(Pb)-free/RoHS-compliant package.
T Denotes tape-and-reel.
Maxim Integrated
│ 25
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MAXM17904/MAXM17905/
MAXM17906
4.5V to 24V, 300mA Himalaya uSLIC
Step-Down Power Module
Revision History
REVISION REVISION
PAGES
CHANGED
DESCRIPTION
NUMBER
DATE
0
3/19
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.
│ 26
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