MAXM17633 [MAXIM]
4.5V to 36V, 2A Himalaya uSLIC Step-Down Power Modules;
| 型号： | MAXM17633 |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | 4.5V to 36V, 2A Himalaya uSLIC Step-Down Power Modules |
| 文件： | 总29页 (文件大小：1646K) |
| 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.
MAXM17633/MAXM17634/
MAXM17635
4.5V to 36V, 2A Himalaya uSLIC
Step-Down Power Modules
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 MAXM17633, MAXM17634, and
MAXM17635 are a family of high-frequency synchronous
step-down DC-DC converter modules with integrated con-
troller, MOSFETs, compensation components, and induc-
tor, that operate over a wide input voltage range. The mod-
ulesoperatefrom4.5Vto36Vinputanddeliverupto2Aout-
put current. MAXM17633 and MAXM17634 are fixed 3.3V
and 5V output modules, respectively. The MAXM17635
is an adjustable-output voltage (0.9V to 12V) 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 36V Input
• Adjustable 0.9V to 12V Output (MAXM17635)
• Fixed 3.3V and 5V Output Versions
(MAXM17633 and MAXM17634)
• 400kHz to 2.2MHz Adjustable Frequency with
External Clock Synchronization
• ±1.2% Feedback Accuracy
• Up to 2A Output Current
• Internally Compensated
• All Ceramic Capacitors
●
●
High Efficiency
• Selectable PWM, PFM, or DCM Mode of Operation
• Shutdown Current as Low as 2.8μA (typ)
The MAXM17633/MAXM17634/MAXM17635 modules
employ peak-current-mode control architecture. To reduce
input inrush current, the devices offer a programmable
soft-start time.
Flexible Design
• Programmable Soft-Start and Prebias Startup
• Open-Drain Power Good Output (RESET Pin)
• Programmable EN/UVLO Threshold
The MAXM17633/MAXM17634/MAXM17635 modules are
available in a low profile, compact 24-pin, 4mm x 4mm x
1.75mm, uSLIC™ package.
●
●
Robust Operation
• Hiccup Overcurrent Protection
• Overtemperature Protection
• -40°C to +125°C Ambient Operating Temperature/
-40°C to +150°C Junction Temperature
Applications
● Industrial Control Power Supplies
● General-Purpose Point-of-Load
● Distributed Supply Regulation
● Base Station Power Supplies
● Programmable Logic Controller
● High Voltage Single-Board Systems
Rugged
• Complies with CISPR22(EN55022) Class B
Conducted and Radiated Emissions
• Passes Drop, Shock, and Vibration Standards:
JESD22-B103, B104, B111
Ordering Information appears at end of data sheet.
Typical Application Circuit
V
V
IN
OUT
7V TO 36V
5V, 2A
IN
OUT
C2
22µF
C1
4.7µF
EN/UVLO
EXTVCC
FB
V
CC
V
CC
MAXM17634
C3
2.2µF
MODE/SYNC
BST
C5
0.1µF
SS
RT
LX
C4
5600pF
RESET
R3
19.1kΩ
C1 = GRM31CR71H475KA12#
C2 = GRM32ER71E226KE15#
SGND
PGND
f
= 1MHz
SW
uSLIC is a trademark of Maxim Integrated Products, Inc.
19-100594; Rev 0; 7/19
MAXM17633/MAXM17634/
MAXM17635
4.5V to 36V, 2A Himalaya uSLIC
Step-Down Power Modules
Absolute Maximum Ratings
IN to PGND ...........................................................-0.3V to +40V
SS, MODE/SYNC, RESET, V , RT to SGND ..-0.3V to +6.5V
CC
EN/UVLO to SGND ....................................-0.3V to (V + 0.3V)
LX, OUT to PGND......................................-0.3V to (V + 0.3V)
EXTVCC to SGND ...............................................-5.5V to +6.5V
BST to PGND.....................................................-0.3V to +46.5V
BST to LX.............................................................-0.3V to +6.5V
PGND to SGND....................................................-0.3V to +0.3V
Output Short-Circuit Duration....................................Continuous
Operating Temperature Range (Note 1)........... -40°C to +125°C
Junction Temperature....................................... -40°C to +150°C
Storage Temperature Range............................ -65°C to +150°C
Lead Temperature (soldering, 10s) .................................+260°C
Soldering Temperature (reflow).......................................+260°C
IN
IN
BST to V
...........................................................-0.3V to +40V
CC
FB to SGND (MAXM17633 and MAXM17634)....-5.5V to +6.5V
FB to SGND (MAXM17635).................................-0.3V to +6.5V
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: 24-PIN uSLIC
Package Code
M244A4+1
21-100342
90-100115
Outline Number
Land Pattern Number
THERMAL RESISTANCE, FOUR-LAYER BOARD (Note 2)
Junction to Ambient (θ 25°C/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
= 24V, R
= Unconnected, C
= 2.2µF, V
= V
= V
= V
= 0V; V
= 3.67V
IN
EN/UVLO
RT
VCC
SGND
PGND
MODE/SYNC
EXTVCC
FB
(MAXM17633), V = 5.5V (MAXM17634), V = 1V (MAXM17635), LX = SS = RESET = OPEN, V
to V = 5V, T = -40°C to
FB
FB
BST
LX A
125°C, unless otherwise noted. Typical values are at T = +25°C. All voltages are referenced to SGND, unless otherwise noted.) (Note 3)
A
PARAMETER
INPUT SUPPLY (V
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
)
IN
Input Voltage Range
V
4.5
36
V
IN
Input Shutdown Current
Input Quiescent Current
I
V
R
= 0V (shutdown mode)
2.8
4.5
μA
IN-SH
EN/UVLO
= 19.1kΩ, MODE/SYNC = OPEN,
RT
I
110
Q_PFM
V
= 5V
EXTVCC
μA
R
= 19.1kΩ, MODE/SYNC = V
,
RT
CC
I
710
13
Q_DCM
V
= 5V
EXTVCC
R
= 19.1kΩ, MODE/SYNC = SGND,
RT
I
mA
Q_PWM
V
= 5V
EXTVCC
Maxim Integrated
│ 2
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MAXM17633/MAXM17634/
MAXM17635
4.5V to 36V, 2A Himalaya uSLIC
Step-Down Power Modules
Electrical Characteristics (continued)
(V = V
= 24V, R
= Unconnected, C
= 2.2µF, V
= V
= V
= V
= 0V; V
= 3.67V
IN
EN/UVLO
RT
VCC
SGND
PGND
MODE/SYNC
EXTVCC
FB
(MAXM17633), V = 5.5V (MAXM17634), V = 1V (MAXM17635), LX = SS = RESET = OPEN, V
to V = 5V, T = -40°C to
FB
FB
BST
LX A
125°C, unless otherwise noted. Typical values are at T = +25°C. All voltages are referenced to SGND, unless otherwise noted.) (Note 3)
A
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
ENABLE/UVLO (EN/UVLO)
V
V
V
V
rising
1.19
1.068
-50
1.215
1.09
0
1.26
1.131
+50
ENR
EN/UVLO
EN/UVLO
EN/UVLO
EN Threshold
V
V
falling
= 0V, T = +25°C
ENF
EN Input Leakage Current
I
nA
EN
A
V
(LDO)
CC
1mA ≤ I
≤ 25mA
4.75
4.75
30
5
5
5.25
5.25
VCC
V
Output Voltage Range
V
V
CC
CC
6V ≤ V ≤ 36V, I
= 1mA
IN
VCC
V
V
Current Limit
Dropout
I
V
V
V
V
= 4.5V, V = 7.5V
mA
V
CC
VCC-MAX
CC
IN
V
= 4.5V, I = 10mA
VCC
0.3
4.3
3.9
CC
CC-DO
IN
V
rising
falling
4.05
3.65
4.2
3.8
VCC_UVR
VCC
VCC
V
UVLO
V
CC
V
VCC_UVF
EXTVCC
V
V
rising
falling
4.56
4.30
4.7
4.84
4.60
EXTVCC
EXTVCC Switchover
Threshold
V
4.43
EXTVCC
SOFT-START (SS)
Charging Current
FEEDBACK (FB)
I
4.7
5
5.3
μA
SS
MODE/SYNC = SGND or
MODE/SYNC = V for MAXM17633
3.256
4.94
3.3
5
3.334
5.06
CC
MODE/SYNC = SGND or
MODE/SYNC = V for MAXM17634
CC
MODE/SYNC = SGND or
MODE/SYNC = V for MAXM17635
FB Regulation Voltage
V
V
FB-REG
0.888
0.9
0.912
CC
MODE/SYNC = OPEN for MAXM17633
MODE/SYNC = OPEN for MAXM17634
MODE/SYNC = OPEN for MAXM17635
For MAXM17633
3.256
4.94
3.36
5.09
0.915
23.2
23.2
3.44
5.21
0.888
0.938
μA
FB Leakage Current
MODE/SYNC
I
For MAXM17634
FB
For MAXM17635, T = +25°C
-50
+50
nA
A
V
MODE/SYNC = V
(DCM mode)
V
- 0.65
M-DCM
CC
CC
MODE Threshold
V
MODE/SYNC = OPEN (PFM mode)
MODE/SYNC = SGND (PWM mode)
V
/2
CC
V
M-PFM
V
0.75
M-PWM
Maxim Integrated
│ 3
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MAXM17633/MAXM17634/
MAXM17635
4.5V to 36V, 2A Himalaya uSLIC
Step-Down Power Modules
Electrical Characteristics (continued)
(V = V
= 24V, R
= Unconnected, C
= 2.2µF, V
= V
= V
= V
= 0V; V
= 3.67V
IN
EN/UVLO
RT
VCC
SGND
PGND
MODE/SYNC
EXTVCC
FB
(MAXM17633), V = 5.5V (MAXM17634), V = 1V (MAXM17635), LX = SS = RESET = OPEN, V
to V = 5V, T = -40°C to
FB
FB
BST
LX A
125°C, unless otherwise noted. Typical values are at T = +25°C. All voltages are referenced to SGND, unless otherwise noted.) (Note 3)
A
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
1.4 x f
SW
UNITS
kHz
SYNC Frequency Capture
Range
f
f
set by R
1.1 x f
SYNC
SW
RT
SW
SYNC Pulse Width
SYNC Threshold
RT
50
ns
V
2.1
IH
V
V
0.8
IL
R
R
R
R
= 50.8kΩ
= 40.2kΩ
= OPEN
= 8.06kΩ
380
475
400
500
420
525
RT
RT
RT
RT
Switching Frequency
f
kHz
%
SW
460
500
540
1950
2200
2450
V
Undervoltage Trip Level
FB
V
61.5
140
64.4
67.5
FB-HICF
to Cause Hiccup
HICCUP Timeout
(Note 4)
32768
52
Cycles
ns
Minimum On-Time
Minimum Off-Time
RESET
t
80
ON(MIN)
t
160
ns
OFF(MIN)
V
400
mV
nA
I
= 10mA
RESET Output Level Low
RESETL
RESET
I
-100
93.8
+100
T = T = 25ºC, V
= 5.5V
RESET Output Leakage Current
RESETLKG
A
J
RESET
FB Threshold for
RESET Rising
V
V
Rising
95
92
97.8
94.6
%
%
FB-OKR
FB
FB Threshold for
RESET Falling
V
V
Falling
90.5
FB-OKF
FB
RESET Delay after FB Reaches
Rising Threshold
1024
Cycles
THERMAL SHUTDOWN (TEMP)
Thermal Shutdown Threshold
Thermal Shutdown Hysteresis
Temperature rising
165
10
°C
°C
Note 3: Electrical specifications are production tested at T = +25ºC. Specifications over the entire operating temperature range are
A
guaranteed by design and characterization.
Note 4: See the Overcurrent Protection/Hiccup Mode section for more details.
Maxim Integrated
│ 4
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MAXM17633/MAXM17634/
MAXM17635
4.5V to 36V, 2A Himalaya uSLIC
Step-Down Power Modules
Typical Operating Characteristics
(V
= V = 24V, V
= V
= 0V, C
= 2.2μF, C
= 0.1μF, C = 5600pF, T = -40°C to +125°C, unless otherwise
EN/UVLO
IN
SGND
PGND
INTVCC
BST SS A
noted. Typical values are at T = +25°C. All voltages are referenced to SGND, unless otherwise noted. The circuit values for different
A
output-voltage applications are as in Table 1, unless otherwise noted.)
MAXM17635
MAXM17635
MAXM17635
EFFICIENCY vs. LOAD CURRENT
VOUT = 0.9V, fSW = 400kHz, PWM MODE
EFFICIENCY vs. LOAD CURRENT
VOUT = 1.5V, fSW = 600kHz, PWM MODE
EFFICIENCY vs. LOAD CURRENT
VOUT = 2.5V, fSW = 700kHz, PWM MODE
toc003
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VIN = 5V
VIN = 12V
VIN = 24V
VIN = 36V
VIN = 5V
VIN = 12V
VIN = 24V
VIN = 36V
VIN = 5V
VIN = 12V
VIN = 24V
IN = 30V
V
0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0
LOAD CURRENT (A)
0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0
LOAD CURRENT (A)
0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0
LOAD CURRENT (A)
MAXM17633/MAXM17635
MAXM17634/MAXM17635
MAXM17635
EFFICIENCY vs. LOAD CURRENT
EFFICIENCY vs. LOAD CURRENT
EFFICIENCY vs. LOAD CURRENT
VOUT = 3.3V, fSW = 800kHz, PWM MODE
VOUT = 5V, fSW = 1MHz, PWM MODE
VOUT = 12V, fSW = 1.8MHz, PWM MODE
toc004
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toc006
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VIN = 18V
VIN = 7V
VIN = 5V
VIN = 12V
VIN = 12V
VIN = 24V
VIN = 24V
VIN = 36V
VIN = 24V
VIN = 36V
VIN = 36V
0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0
LOAD CURRENT (A)
0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0
LOAD CURRENT (A)
0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0
LOAD CURRENT (A)
MAXM17635
MAXM17635
MAXM17635
EFFICIENCY vs. LOAD CURRENT
EFFICIENCY vs. LOAD CURRENT
EFFICIENCY vs. LOAD CURRENT
VOUT = 0.9V, fSW = 400kHz, PFM MODE
VOUT = 1.5V, fSW = 600kHz, PFM MODE
VOUT = 2.5V, fSW = 700kHz, PFM MODE
toc007
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toc009
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VIN = 5V
VIN = 12V
VIN = 5V
VIN = 12V
VIN = 5V
VIN = 12V
VIN = 24V
VIN = 24V
VIN = 36V
VIN = 24V
VIN = 36V
VIN = 30V
0.01
0.1
1
0.01
0.1
1
0.01
0.1
1
LOAD CURRENT (A)
LOAD CURRENT (A)
LOAD CURRENT (A)
Maxim Integrated
│ 5
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MAXM17633/MAXM17634/
MAXM17635
4.5V to 36V, 2A Himalaya uSLIC
Step-Down Power Modules
Typical Operating Characteristics (continued)
(V
= V = 24V, V
= V
= 0V, C
= 2.2μF, C
= 0.1μF, C = 5600pF, T = -40°C to +125°C, unless otherwise
EN/UVLO
IN
SGND
PGND
INTVCC
BST SS A
noted. Typical values are at T = +25°C. All voltages are referenced to SGND, unless otherwise noted. The circuit values for different
A
output-voltage applications are as in Table 1, unless otherwise noted.)
MAXM17633/MAXM17635
EFFICIENCY vs. LOAD CURRENT
VOUT = 3.3V, fSW = 800kHz, PFM MODE
MAXM17634/MAXM17635
EFFICIENCY vs. LOAD CURRENT
VOUT = 5V, fSW = 1MHz, PFM MODE
MAXM17635
EFFICIENCY vs. LOAD CURRENT
VOUT = 12V, fSW = 1.8MHz, PFM MODE
toc012
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VIN = 7V
VIN = 18V
VIN = 12V
VIN = 24V
VIN = 5V
VIN = 12V
VIN = 24V
VIN = 36V
VIN = 24V
VIN = 36V
VIN = 36V
0.01
0.01
0.01
0.1
1
0.01
0.01
0.01
0.1
1
0.01
0.01
0.01
0.1
1
LOAD CURRENT (A)
LOAD CURRENT (A)
LOAD CURRENT (A)
MAXM17635
EFFICIENCY vs. LOAD CURRENT
OUT = 0.9V, fSW = 400kHz, DCM MODE
MAXM17635
EFFICIENCY vs. LOAD CURRENT
OUT = 1.5V, fSW = 600kHz, DCM MODE
MAXM17635
EFFICIENCY vs. LOAD CURRENT
VOUT = 2.5V, fSW = 700kHz, DCM MODE
V
V
toc013
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VIN = 5V
VIN = 12V
VIN = 24V
VIN = 36V
VIN = 5V
VIN = 12V
VIN = 5V
VIN = 12V
VIN = 24V
VIN = 24V
VIN = 36V
VIN = 30V
0.1
1
0.1
1
0.1
1
LOAD CURRENT (A)
LOAD CURRENT (A)
LOAD CURRENT (A)
MAXM17633/MAXM17635
EFFICIENCY vs. LOAD CURRENT
VOUT = 3.3V, fSW = 800kHz, DCM MODE
MAXM17634/MAXM17635
EFFICIENCY vs. LOAD CURRENT
VOUT = 5V, fSW = 1MHz, DCM MODE
MAXM17635
EFFICIENCY vs. LOAD CURRENT
OUT = 12V, fSW = 1.8MHz, DCM MODE
toc018
V
toc016
toc017
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VIN = 7V
VIN = 5V
VIN = 12V
VIN = 24V
VIN = 36V
VIN = 18V
VIN = 12V
VIN = 24V
V
IN = 24V
VIN = 36V
VIN = 36V
0.1
1
0.1
LOAD CURRENT (A)
1
0.1
LOAD CURRENT (A)
1
LOAD CURRENT (A)
Maxim Integrated
│ 6
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MAXM17633/MAXM17634/
MAXM17635
4.5V to 36V, 2A Himalaya uSLIC
Step-Down Power Modules
Typical Operating Characteristics (continued)
(V
= V = 24V, V
= V
= 0V, C
= 2.2μF, C
= 0.1μF, C = 5600pF, T = -40°C to +125°C, unless otherwise
EN/UVLO
IN
SGND
PGND
INTVCC
BST SS A
noted. Typical values are at T = +25°C. All voltages are referenced to SGND, unless otherwise noted. The circuit values for different
A
output-voltage applications are as in Table 1, unless otherwise noted.)
MAXM17635
MAXM17635
MAXM17635
OUTPUT VOLTAGEvs. LOAD CURRENT
OUTPUT VOLTAGEvs. LOAD CURRENT
OUTPUT VOLTAGEvs. LOAD CURRENT
VOUT = 0.9V, fSW = 400kHz, PWM MODE
VOUT = 1.5V, fSW = 600kHz, PWM MODE
VOUT = 2.5V, fSW = 700kHz, PWM MODE
toc020
toc021
toc019
0.901
0.900
0.899
0.898
0.897
0.896
1.520
1.518
1.516
1.514
1.512
1.510
2.550
2.546
2.542
2.538
2.534
2.530
VIN = 30V
VIN = 24V
VIN = 12V
VIN = 36V
VIN = 12V
VIN = 36V
VIN = 5V
VIN = 24V
VIN = 5V
VIN = 24V
VIN = 12V
VIN = 5V
0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0
LOAD CURRENT (A)
0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0
LOAD CURRENT (A)
0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0
LOAD CURRENT (A)
MAXM17633/MAXM17635
MAXM17634/MAXM17635
MAXM17635
OUTPUT VOLTAGEvs. LOAD CURRENT
OUTPUT VOLTAGEvs. LOAD CURRENT
OUTPUT VOLTAGEvs. LOAD CURRENT
V
OUT = 3.3V, fSW = 800kHz, PWM MODE
V
OUT = 5V, fSW = 1MHz, PWM MODE
V
OUT = 12V, fSW = 1.8MHz, PWM MODE
toc022
toc023
toc024
3.33
3.32
3.31
3.30
3.29
3.28
5.080
5.076
5.072
5.068
5.064
5.060
12.10
12.09
12.08
12.07
12.06
12.05
VIN = 36V
VIN = 24V
VIN = 12V
VIN = 7V
VIN = 24V
VIN = 12V
VIN = 36V
VIN = 5V
VIN = 24V
VIN = 18V
VIN = 36V
0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0
LOAD CURRENT (A)
0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0
LOAD CURRENT (A)
0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0
LOAD CURRENT (A)
MAXM17635
MAXM17635
MAXM17635
OUTPUT VOLTAGEvs. LOAD CURRENT
OUTPUT VOLTAGEvs. LOAD CURRENT
OUTPUT VOLTAGEvs. LOAD CURRENT
V
OUT = 0.9V, fSW = 400kHz, PFM MODE
V
OUT = 1.5V, fSW = 600kHz, PFM MODE
VOUT = 2.5V, fSW = 700kHz, PFM MODE
toc025
toc026
toc027
0.96
0.94
0.92
0.90
0.88
0.86
1.58
1.56
1.54
1.52
1.50
1.48
2.65
2.62
2.59
2.56
2.53
2.50
VIN = 5V
VIN = 12V
VIN = 24V
VIN = 5V
VIN = 5V
VIN = 12V
VIN = 24V
VIN = 36V
VIN = 12V
VIN = 24V
VIN = 30V
VIN = 36V
0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0
LOAD CURRENT (A)
0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0
LOAD CURRENT (A)
0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0
LOAD CURRENT (mA)
Maxim Integrated
│ 7
www.maximintegrated.com
MAXM17633/MAXM17634/
MAXM17635
4.5V to 36V, 2A Himalaya uSLIC
Step-Down Power Modules
Typical Operating Characteristics (continued)
(V
= V = 24V, V
= V
= 0V, C
= 2.2μF, C
= 0.1μF, C = 5600pF, T = -40°C to +125°C, unless otherwise
EN/UVLO
IN
SGND
PGND
INTVCC
BST SS A
noted. Typical values are at T = +25°C. All voltages are referenced to SGND, unless otherwise noted. The circuit values for different
A
output-voltage applications are as in Table 1, unless otherwise noted.)
MAXM17633/MAXM17635
OUTPUT VOLTAGEvs. LOAD CURRENT
VOUT = 3.3V, fSW = 800kHz, PFM MODE
MAXM17634/MAXM17635
OUTPUT VOLTAGEvs. LOAD CURRENT
VOUT = 5V, fSW = 1MHz, PFM MODE
MAXM17635
OUTPUT VOLTAGEvs. LOAD CURRENT
VOUT = 12V, fSW = 1.8MHz, PFM MODE
toc030
toc028
toc029
3.40
3.37
3.34
3.31
3.28
3.25
5.20
5.16
5.12
5.08
5.04
5.00
12.4
12.3
12.2
12.1
12.0
11.9
VIN = 7V
VIN = 12V
VIN = 5V
VIN = 24V
VIN = 36V
VIN = 12V
VIN = 24V
VIN = 36V
VIN = 18V
VIN = 36V
VIN = 24V
0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0
LOAD CURRENT (A)
0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0
LOAD CURRENT (A)
0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0
LOAD CURRENT (A)
MAXM17635
MAXM17635
MAXM17635
OUTPUT VOLTAGEvs. LOAD CURRENT
OUTPUT VOLTAGEvs. LOAD CURRENT
OUTPUT VOLTAGEvs. LOAD CURRENT
VOUT = 0.9V, fSW = 400kHz, DCM MODE
VOUT = 1.5V, fSW = 600kHz, DCM MODE
VOUT = 2.5V, fSW = 700kHz, DCM MODE
toc033
toc031
toc032
0.901
0.900
0.899
0.898
0.897
0.896
1.520
1.518
1.516
1.514
1.512
1.510
2.550
2.546
2.542
2.538
2.534
2.530
VIN = 30V
VIN = 12V
VIN = 36V
VIN = 12V
VIN = 24V
VIN = 5V
VIN = 36V
VIN = 24V
VIN = 5V
VIN = 12V
VIN = 24V
VIN = 5V
0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0
LOAD CURRENT (A)
0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0
LOAD CURRENT (A)
0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0
LOAD CURRENT (A)
MAXM17633/MAXM17635
OUTPUT VOLTAGEvs. LOAD CURRENT
VOUT = 3.3V, fSW = 800kHz, DCM MODE
MAXM17635
OUTPUT VOLTAGEvs. LOAD CURRENT
OUT = 12V, fSW = 1.8MHz, DCM MODE
MAXM17634/MAXM17635
OUTPUT VOLTAGEvs. LOAD CURRENT
VOUT = 5V, fSW = 1MHz, DCM MODE
V
toc034
toc035
toc036
3.33
3.32
3.31
3.30
3.29
3.28
5.080
5.076
5.072
5.068
5.064
5.060
12.10
12.09
12.08
12.07
12.06
12.05
VIN = 36V
VIN = 12V
VIN = 7V
VIN = 24V
VIN = 36V
VIN = 12V
VIN = 5V
VIN = 24V
VIN = 18V
VIN = 24V
VIN = 36V
0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0
LOAD CURRENT (A)
0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0
LOAD CURRENT (A)
0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0
LOAD CURRENT (A)
Maxim Integrated
│ 8
www.maximintegrated.com
MAXM17633/MAXM17634/
MAXM17635
4.5V to 36V, 2A Himalaya uSLIC
Step-Down Power Modules
Typical Operating Characteristics (continued)
(V
= V = 24V, V
= V
= 0V, C
= 2.2μF, C
= 0.1μF, C = 5600pF, T = -40°C to +125°C, unless otherwise
EN/UVLO
IN
SGND
PGND
INTVCC
BST SS A
noted. Typical values are at T = +25°C. All voltages are referenced to SGND, unless otherwise noted. The circuit values for different
A
output-voltage applications are as in Table 1, unless otherwise noted.)
MAXM17635
STEADY-STATE OUTPUT-VOLTAGE RIPPLE
MAXM17633/MAXM17635
STEADY-STATE OUTPUT-VOLTAGE RIPPLE
MAXM17634/MAXM17635
STEADY-STATE OUTPUT-VOLTAGE RIPPLE
VOUT = 2.5V, fSW = 700kHz, FULL LOAD, PWM MODE
VOUT = 3.3V, fSW = 800kHz, FULL LOAD, PWM MODE
VOUT = 5V, fSW = 1MHz, FULL LOAD, PWM MODE
toc037
toc039
toc038
10mV/div
VOUT(AC)
VOUT(AC)
10mV/div
VOUT(AC)
10mV/div
1µs/div
1µs/div
1µs/div
MAXM17635
STEADY-STATE OUTPUT-VOLTAGE RIPPLE
MAXM17635
STEADY-STATE OUTPUT-VOLTAGE RIPPLE
MAXM17633/MAXM17635
STEADY-STATE OUTPUT-VOLTAGE RIPPLE
VOUT = 12V, fSW = 1.8MHz, FULL LOAD, PWM MODE
VOUT = 2.5V, fSW = 700kHz, NO LOAD, PFM MODE
VOUT = 3.3V, fSW = 800kHz, NO LOAD, PFM MODE
toc040
toc041
toc042
10mV/div
VOUT(AC)
VOUT(AC)
VOUT(AC)
20mV/div
20mV/div
20ms/div
40ms/div
400ns/div
MAXM17634/MAXM17635
STEADY-STATE OUTPUT-VOLTAGE RIPPLE
MAXM17635
STEADY-STATE OUTPUT-VOLTAGE RIPPLE
MAXM17635
STEADY-STATE OUTPUT-VOLTAGE RIPPLE
VOUT = 5V, fSW = 1MHz, NO LOAD, PFM MODE
VOUT = 12V, fSW = 1.8MHz, NO LOAD, PFM MODE
VOUT = 2.5V, fSW = 700kHz, 20mA LOAD, DCM MODE
toc043
toc045
toc044
VOUT(AC)
10mV/div
VOUT(AC)
VOUT(AC)
50mV/div
100mV/div
20ms/div
4µs/div
20ms/div
Maxim Integrated
│ 9
www.maximintegrated.com
MAXM17633/MAXM17634/
MAXM17635
4.5V to 36V, 2A Himalaya uSLIC
Step-Down Power Modules
Typical Operating Characteristics (continued)
(V
= V = 24V, V
= V
= 0V, C
= 2.2μF, C
= 0.1μF, C = 5600pF, T = -40°C to +125°C, unless otherwise
EN/UVLO
IN
SGND
PGND
INTVCC
BST SS A
noted. Typical values are at T = +25°C. All voltages are referenced to SGND, unless otherwise noted. The circuit values for different
A
output-voltage applications are as in Table 1, unless otherwise noted.)
MAXM17633/MAXM17635
STEADY-STATE OUTPUT-VOLTAGE RIPPLE
MAXM17634/MAXM17635
STEADY-STATE OUTPUT-VOLTAGE RIPPLE
MAXM17635
STEADY-STATE OUTPUT-VOLTAGE RIPPLE
VOUT = 3.3V, fSW = 800kHz, 20mA LOAD, DCM MODE
VOUT = 5V, fSW = 1MHz, 20mA LOAD, DCM MODE
VOUT = 12V, fSW = 1.8MHz, 20mA LOAD, DCM MODE
toc047
toc046
toc048
VOUT(AC)
10mV/div
10mV/div
VOUT(AC)
10mV/div
VOUT(AC)
4µs/div
4µs/div
1µs/div
MAXM17635 LOAD-TRANSIENT RESPONSE
VOUT = 2.5V, fSW = 700kHz, PWM MODE,
MAXM17635 LOAD-TRANSIENT RESPONSE
VOUT = 2.5V, fSW = 700kHz, PWM MODE,
MAXM17635 LOAD-TRANSIENT RESPONSE
VOUT = 2.5V, fSW = 700kHz, PFM MODE,
LOAD CURRENT STEPPED FROM 0A TO 1A
LOAD CURRENT STEPPED FROM 1A TO 2A
LOAD CURRENT STEPPED FROM 20mA TO 1A
toc051
toc049
toc050
VOUT(AC)
VOUT(AC)
VOUT(AC)
100mV/div
100mV/div
1A/div
100mV/div
IOUT
1A/div
1A/div
IOUT
IOUT
200µs/div
200µs/div
200µs/div
MAXM17633/MAXM17635 LOAD-TRANSIENT RESPONSE
VOUT = 3.3V, fSW = 800kHz, PWM MODE,
MAXM17635 LOAD-TRANSIENT RESPONSE
VOUT = 2.5V, fSW = 700kHz, DCM MODE,
MAXM17633/MAXM17635 LOAD-TRANSIENT RESPONSE
VOUT = 3.3V, fSW = 800kHz, PWM MODE,
LOAD CURRENT STEPPED FROM 0A TO 1A
LOAD CURRENT STEPPED FROM 20mA TO 1A
LOAD CURRENT STEPPED FROM 1A TO 2A
toc053
toc052
toc054
VOUT(AC)
VOUT(AC)
VOUT(AC)
100mV/div
100mV/div
100mV/div
1A/div
IOUT
1A/div
IOUT
1A/div
IOUT
200µs/div
200µs/div
200µs/div
Maxim Integrated
│ 10
www.maximintegrated.com
MAXM17633/MAXM17634/
MAXM17635
4.5V to 36V, 2A Himalaya uSLIC
Step-Down Power Modules
Typical Operating Characteristics (continued)
(V
= V = 24V, V
= V
= 0V, C
= 2.2μF, C
= 0.1μF, C = 5600pF, T = -40°C to +125°C, unless otherwise
EN/UVLO
IN
SGND
PGND
INTVCC
BST SS A
noted. Typical values are at T = +25°C. All voltages are referenced to SGND, unless otherwise noted. The circuit values for different
A
output-voltage applications are as in Table 1, unless otherwise noted.)
MAXM17633/MAXM17635 LOAD-TRANSIENT RESPONSE
OUT = 3.3V, fSW = 800kHz, DCM MODE,
LOAD CURRENT STEPPED FROM 20mA TO 1A
MAXM17633/MAXM17635 LOAD-TRANSIENT RESPONSE
VOUT = 3.3V, fSW = 800kHz, PFM MODE,
MAXM17634/MAXM17635 LOAD-TRANSIENT RESPONSE
VOUT = 5V, fSW = 1MHz, PWM MODE,
V
LOAD CURRENT STEPPED FROM 20mA TO 1A
LOAD CURRENT STEPPED FROM 0A TO 1A
toc056
toc057
toc055
VOUT(AC)
VOUT(AC)
100mV/div
100mV/div
100mV/div
VOUT(AC)
IOUT
1A/div
1A/div
1A/div
IOUT
IOUT
200µs/div
200µs/div
200µs/div
MAXM17634/MAXM17635 LOAD-TRANSIENT RESPONSE
VOUT = 5V, fSW = 1MHz, PWM MODE,
MAXM17634/MAXM17635 LOAD-TRANSIENT RESPONSE
VOUT = 5V, fSW = 1MHz, PFM MODE,
MAXM17634/MAXM17635 LOAD-TRANSIENT RESPONSE
OUT = 5V, fSW = 1MHz, DCM MODE,
V
LOAD CURRENT STEPPED FROM 1A TO 2A
LOAD CURRENT STEPPED FROM 20mA TO 1A
LOAD CURRENT STEPPED FROM 20mA TO 1A
toc058
toc059
toc060
VOUT(AC)
100mV/div
VOUT(AC)
100mV/div
VOUT(AC)
100mV/div
1A/div
IOUT
1A/div
IOUT
1A/div
IOUT
200µs/div
200µs/div
200µs/div
MAXM17635 LOAD-TRANSIENT RESPONSE
VOUT = 12V, fSW = 1.8MHz, PFM MODE,
MAXM17635 LOAD-TRANSIENT RESPONSE
MAXM17635 LOAD-TRANSIENT RESPONSE
VOUT = 12V, fSW = 1.8MHz, PWM MODE,
VOUT = 12V, fSW = 1.8MHz, PWM MODE,
LOAD CURRENT STEPPED FROM 20mA TO 1A
LOAD CURRENT STEPPED FROM 0A TO 1A
LOAD CURRENT STEPPED FROM 1A TO 2A
toc063
toc062
toc061
VOUT(AC)
VOUT(AC)
VOUT(AC)
200mV/div
200mV/div
1A/div
500mV/div
1A/div
1A/div
IOUT
IOUT
IOUT
200µs/div
200µs/div
200µs/div
Maxim Integrated
│ 11
www.maximintegrated.com
MAXM17633/MAXM17634/
MAXM17635
4.5V to 36V, 2A Himalaya uSLIC
Step-Down Power Modules
Typical Operating Characteristics (continued)
(V
= V = 24V, V
= V
= 0V, C
= 2.2μF, C
= 0.1μF, C = 5600pF, T = -40°C to +125°C, unless otherwise
EN/UVLO
IN
SGND
PGND
INTVCC
BST SS A
noted. Typical values are at T = +25°C. All voltages are referenced to SGND, unless otherwise noted. The circuit values for different
A
output-voltage applications are as in Table 1, unless otherwise noted.)
MAXM17635 LOAD-TRANSIENT RESPONSE
VOUT = 12V, fSW = 1.8MHz, DCM MODE,
MAXM17635 STARTUP THROUGH ENABLE
MAXM17635 SHUTDOWN THROUGH ENABLE
VOUT = 2.5V, fSW = 700kHz, FULL LOAD, PWM MODE
VOUT = 2.5V, fSW = 700kHz, FULL LOAD, PWM MODE
toc066
LOAD CURRENT STEPPED FROM 20mA TO 1A
toc065
toc064
5V/div
EN/UVLO
5V/div
EN/UVLO
LX
20V/div
1V/div
20V/div
LX
VOUT(AC)
500mV/div
VOUT
1V/div
5V/div
VOUT
5V/div
RESET
RESET
1A/div
IOUT
1ms/div
100μs/div
200µs/div
MAXM17635 SHUTDOWN THROUGH ENABLE
MAXM17633/MAXM17635 STARTUP THROUGH ENABLE
VOUT = 3.3V, fSW = 800kHz, FULL LOAD, PWM MODE
MAXM17635 STARTUP THROUGH ENABLE
VOUT = 2.5V, fSW = 700kHz, 20mA LOAD, PFM MODE
VOUT = 2.5V, fSW = 700kHz, 20mA LOAD, PFM MODE
toc068
toc067
toc069
5V/div
5V/div
EN/UVLO
EN/UVLO
EN/UVLO
5V/div
LX
20V/div
1V/div
20V/div
2V/div
LX
LX
20V/div
1V/div
5V/div
VOUT
VOUT
VOUT
5V/div
5V/div
RESET
RESET
RESET
1ms/div
20ms/div
1ms/div
MAXM17633/MAXM17635 STARTUP THROUGH ENABLE
VOUT = 3.3V, fSW = 800kHz, 20mA LOAD, PFM MODE
toc071
MAXM17633/MAXM17635 SHUTDOWN THROUGH ENABLE
MAXM17633/MAXM17635 SHUTDOWN THROUGH ENABLE
VOUT = 3.3V, fSW = 800kHz, 20mA LOAD, PFM MODE
toc072
VOUT = 3.3V, fSW = 800kHz, FULL LOAD, PWM MODE
toc070
5V/div
EN/UVLO
5V/div
EN/UVLO
5V/div
EN/UVLO
20V/div
20V/div
2V/div
LX
LX
LX
20V/div
VOUT
VOUT
2V/div
5V/div
2V/div
5V/div
VOUT
5V/div
RESET
RESET
RESET
1ms/div
20ms/div
100μs/div
Maxim Integrated
│ 12
www.maximintegrated.com
MAXM17633/MAXM17634/
MAXM17635
4.5V to 36V, 2A Himalaya uSLIC
Step-Down Power Modules
Typical Operating Characteristics (continued)
(V
= V = 24V, V
= V
= 0V, C
= 2.2μF, C
= 0.1μF, C = 5600pF, T = -40°C to +125°C, unless otherwise
EN/UVLO
IN
SGND
PGND
INTVCC
BST SS A
noted. Typical values are at T = +25°C. All voltages are referenced to SGND, unless otherwise noted. The circuit values for different
A
output-voltage applications are as in Table 1, unless otherwise noted.)
MAXM17634/MAXM17635 SHUTDOWN THROUGH ENABLE
VOUT = 5V, fSW = 1MHz, FULL LOAD, PWM MODE
toc074
MAXM17634/MAXM17635 STARTUP THROUGH ENABLE
VOUT = 5V, fSW = 1MHz, FULL LOAD, PWM MODE
toc073
MAXM17634/MAXM17635 STARTUP THROUGH ENABLE
VOUT = 5V, fSW = 1MHz, 20mA LOAD, PFM MODE
toc075
5V/div
5V/div
EN/UVLO
EN/UVLO
5V/div
EN/UVLO
LX
20V/div
2V/div
20V/div
2V/div
LX
LX
20V/div
VOUT
2V/div
5V/div
VOUT
VOUT
5V/div
5V/div
RESET
RESET
RESET
1ms/div
1ms/div
100μs/div
MAXM17634/MAXM17635 SHUTDOWN THROUGH ENABLE
MAXM17635 STARTUP THROUGH IN
MAXM17635 SHUTDOWN THROUGH IN
VOUT = 5V, fSW = 1MHz, 20mA LOAD, PFM MODE
VOUT = 2.5V, fSW = 700kHz, FULL LOAD, PWM MODE
VOUT = 2.5V, fSW = 700kHz, FULL LOAD, PWM MODE
toc077
toc076
toc078
20V/div
VIN
LX
VIN
EN/UVLO
LX
5V/div
20V/div
20V/div
2V/div
LX
20V/div
20V/div
1V/div
VOUT
VCC
VCC
2V/div
1V/div
2V/div
5V/div
VOUT
RESET
VOUT
1ms/div
20ms/div
2ms/div
MAXM17633/MAXM17635 STARTUP THROUGH IN
MAXM17635 SHUTDOWN THROUGH IN
MAXM17635 STARTUP THROUGH IN
VOUT = 3.3V, fSW = 800kHz, FULL LOAD, PWM MODE
VOUT = 2.5V, fSW = 700kHz, 20mA LOAD, PFM MODE
VOUT = 2.5V, fSW = 700kHz, 20mA LOAD, PFM MODE
toc081
toc079
toc080
20V/div
20V/div
VIN
LX
VIN
VIN
LX
20V/div
20V/div
2V/div
20V/div
2V/div
LX
20V/div
1V/div
2V/div
VCC
VCC
2V/div
1V/div
VCC
VOUT
VOUT
VOUT
1ms/div
1ms/div
20ms/div
Maxim Integrated
│ 13
www.maximintegrated.com
MAXM17633/MAXM17634/
MAXM17635
4.5V to 36V, 2A Himalaya uSLIC
Step-Down Power Modules
Typical Operating Characteristics (continued)
(V
= V = 24V, V
= V
= 0V, C
= 2.2μF, C
= 0.1μF, C = 5600pF, T = -40°C to +125°C, unless otherwise
EN/UVLO
IN
SGND
PGND
INTVCC
BST SS A
noted. Typical values are at T = +25°C. All voltages are referenced to SGND, unless otherwise noted. The circuit values for different
A
output-voltage applications are as in Table 1, unless otherwise noted.)
MAXM17633/MAXM17635 SHUTDOWN THROUGH IN
MAXM17633/MAXM17635 SHUTDOWN THROUGH IN
MAXM17633/MAXM17635 STARTUP THROUGH IN
VOUT = 3.3V, fSW = 800kHz, FULL LOAD, PWM MODE
VOUT = 3.3V, fSW = 800kHz, 20mA LOAD, PFM MODE
VOUT = 3.3V, fSW = 800kHz, 20mA LOAD, PFM MODE
toc082
toc084
toc083
20V/div
VIN
LX
VIN
LX
VIN
LX
20V/div
20V/div
20V/div
20V/div
20V/div
2V/div
2V/div
VCC
VCC
2V/div
2V/div
2V/div
2V/div
VCC
VOUT
VOUT
VOUT
2ms/div
1ms/div
20ms/div
MAXM17634/MAXM17635 STARTUP THROUGH IN
MAXM17634/MAXM17635 SHUTDOWN THROUGH IN
MAXM17634/MAXM17635 STARTUP THROUGH IN
VOUT = 5V, fSW = 1MHz, FULL LOAD, PWM MODE
VOUT = 5V, fSW = 1MHz, FULL LOAD, PWM MODE
VOUT = 5V, fSW = 1MHz, 20mA LOAD, PFM MODE
toc086
toc087
toc085
20V/div
20V/div
VIN
LX
VIN
LX
VIN
20V/div
20V/div
2V/div
20V/div
2V/div
LX
20V/div
2V/div
2V/div
VCC
VCC
VCC
2V/div
2V/div
VOUT
VOUT
VOUT
2ms/div
1ms/div
1ms/div
MAXM17633/MAXM17635
STARTUP THROUGH ENABLE (2.5V PREBIAS)
VOUT = 3.3V, fSW = 800kHz, FULL LOAD, PWM MODE
MAXM17634/MAXM17635
STARTUP THROUGH ENABLE (3.3V PREBIAS)
VOUT = 5V, fSW = 1MHz, FULL LOAD, PWM MODE
MAXM17634/MAXM17635 SHUTDOWN THROUGH IN
VOUT = 5V, fSW = 1MHz, 20mA LOAD, PFM MODE
toc088
toc090
toc089
5V/div
5V/div
VIN
20V/div
EN/UVLO
EN/UVLO
LX
20V/div
LX
LX
20V/div
2V/div
20V/div
2V/div
VCC
2V/div
2V/div
VOUT
5V/div
VOUT
5V/div
VOUT
RESET
RESET
20ms/div
1ms/div
1ms/div
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MAXM17633/MAXM17634/
MAXM17635
4.5V to 36V, 2A Himalaya uSLIC
Step-Down Power Modules
Typical Operating Characteristics (continued)
(V
= V = 24V, V
= V
= 0V, C
= 2.2μF, C
= 0.1μF, C = 5600pF, T = -40°C to +125°C, unless otherwise
EN/UVLO
IN
SGND
PGND
INTVCC
BST SS A
noted. Typical values are at T = +25°C. All voltages are referenced to SGND, unless otherwise noted. The circuit values for different
A
output-voltage applications are as in Table 1, unless otherwise noted.)
MAXM17635
OUTPUT SHORT DURING STARTUP
MAXM17635
STARTUP THROUGH ENABLE (5V PREBIAS)
MAXM17635
OUTPUT SHORT IN STEADY STATE
VOUT = 2.5V, fSW = 700kHz, FULL LOAD, PWM MODE
VOUT = 12V, fSW = 1.8MHz, FULL LOAD, PWM MODE
VOUT = 2.5V, fSW = 700kHz, FULL LOAD, PWM MODE
toc091
toc092
toc093
20V/div
5V/div
5V/div
EN/UVLO
SHORT
VIN
LX
20V/div
5V/div
50mV/div
20V/div
VOUT
VOUT
2V/div
20V/div
LX
LX
VOUT
5V/div
RESET
IOUT
IOUT
1A/div
20mA/div
20ms/div
20ms/div
1ms/div
MAXM17633/MAXM17635
OUTPUT SHORT IN STEADY STATE
MAXM17633/MAXM17635
OUTPUT SHORT DURING STARTUP
MAXM17634/MAXM17635
OUTPUT SHORT IN STEADY STATE
VOUT = 3.3V, fSW = 800kHz, FULL LOAD, PWM MODE
VOUT = 3.3V, fSW = 800kHz, FULL LOAD, PWM MODE
VOUT = 5V, fSW = 1MHz, FULL LOAD, PWM MODE
toc096
toc095
toc094
20V/div
5V/div
5V/div
SHORT
VIN
SHORT
50mV/div
20V/div
VOUT
5V/div
VOUT
VOUT
2V/div
20V/div
LX
20V/div
LX
LX
IOUT
1A/div
20mA/div
1A/div
IOUT
IOUT
10ms/div
10ms/div
10ms/div
MAXM17634/MAXM17635 EXT CLOCK SYNC
VOUT = 5V, fSW = 1MHz, fSYNC = 1.4MHz,
MAXM17634/MAXM17635
OUTPUT SHORT DURING STARTUP
VOUT = 5V, fSW = 1MHz, FULL LOAD, PWM MODE
MAXM17634/MAXM17635 EXT CLOCK SYNC
VOUT = 5V, fSW = 1MHz, fSYNC = 1.4MHz,
FULL LOAD, PWM MODE
FULL LOAD, PWM MODE
toc098
toc097
toc099
20V/div
VSYNC
VIN
VSYNC
5V/div
5V/div
VOUT
50mV/div
VOUT(AC)
20mV/div
LX
20V/div
IOUT
50mA/div
20V/div
LX
20V/div
LX
10ms/div
2µs/div
20µs/div
Maxim Integrated
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MAXM17633/MAXM17634/
MAXM17635
4.5V to 36V, 2A Himalaya uSLIC
Step-Down Power Modules
Typical Operating Characteristics (continued)
(V
= V = 24V, V
= V
= 0V, C
= 2.2μF, C
= 0.1μF, C = 5600pF, T = -40°C to +125°C, unless otherwise
EN/UVLO
IN
SGND
PGND
INTVCC
BST SS A
noted. Typical values are at T = +25°C. All voltages are referenced to SGND, unless otherwise noted. The circuit values for different
A
output-voltage applications are as in Table 1, unless otherwise noted.)
MAXM17635 BODE PLOT
VOUT = 2.5V, fSW = 700kHz, FULL LOAD, PWM MODE
toc100
MAXM17633/MAXM17635 BODE PLOT
VOUT = 3.3V, fSW = 800kHz, FULL LOAD, PWM MODE
toc101
MAXM17634/MAXM17635 BODE PLOT
VOUT = 5V, fSW = 1MHz, FULL LOAD, PWM MODE
toc102
40
150
125
100
75
40
150
125
100
75
40
150
125
100
75
30
30
30
20
20
20
10
10
10
PHASE
0
50
0
50
0
50
PHASE
PHASE
GAIN
GAIN
-10
-20
-30
-40
25
-10
-20
-30
-40
25
-10
-20
-30
-40
25
GAIN
0
0
0
CROSSOVER FREQUENCY = 59.862kHz
PHASE MARGIN = 68.352°
CROSSOVER FREQUENCY = 85.608kHz
PHASE MARGIN = 66.088°
CROSSOVER FREQUENCY = 88.858kHz
PHASE MARGIN = 58.211°
-25
-50
-25
-50
-25
-50
1k
10k
100k
1k
10k
100k
1k
10k
100k
FREQUENCY (Hz)
FREQUENCY (Hz)
FREQUENCY (Hz)
MAXM17635 BODE PLOT
MAXM17633/MAXM17634/MAXM17635
OUTPUT CURRENT vs. AMBIENT TEMPERATURE
VOUT = 12V, fSW = 1.8MHz, FULL LOAD, PWM MODE
toc104
toc103
40
30
150
125
100
75
2.5
2.0
1.5
1.0
0.5
0.0
20
10
VOUT = 3.3V
VOUT = 5V
0
50
PHASE
-10
-20
-30
-40
25
GAIN
0
CROSSOVER FREQUENCY = 60.752kHz
PHASE MARGIN = 74.878°
-25
-50
VOUT = 12V
1k
10k
100k
25 35 45 55 65 75 85 95 105 115 125
AMBIENT TEMPERATURE ( C)
°
FREQUENCY (Hz)
MEASURED ON MAXM17633/MAXM17634/MAXM17635 EV KIT
MAXM17634/MAXM17635 RADIATED EMISSIONS PLOT
MAXM17633/MAXM17635 RADIATED EMISSIONS PLOT
VOUT = 5V, fSW = 1MHz, FULL LOAD, PWM MODE
70
VOUT = 3.3V, fSW = 800kHz, FULL LOAD, PWM MODE
70
toc108
toc107
60
50
60
50
CISPR-22 CLASS B QP LIMIT
HORIZONTAL SCAN
CISPR-22 CLASS B QP LIMIT
HORIZONTAL SCAN
40
30
20
40
30
20
VERTICAL SCAN
10
0
10
0
VERTICAL SCAN
-10
30M
-10
30M
100M
1G
100M
FREQUENCY (Hz)
MEASURED ON MAXM17634 EV KIT
1G
FREQUENCY (Hz)
MEASURED ON MAXM17633 EV KIT
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MAXM17633/MAXM17634/
MAXM17635
4.5V to 36V, 2A Himalaya uSLIC
Step-Down Power Modules
Pin Configuration
TOP VIEW
20
19
23
24
21
22
18
IN
1
2
3
4
5
6
LX
BST
17
16
15
14
13
IN
MAXM17633/
MAXM17634/
MAXM17635
EXTVCC
OUT
IN
EV/UVLO
RESET
OUT
OUT
V
CC
10
7
8
9
11
12
TQFN
4mm x 4mm
‘
’ INDICATES PIN 1 OF THE MODULE
Pin Description
PIN
1, 24
2
NAME
LX
FUNCTION
Switching Node Pins.
BST
Bootstrap Flying Capacitor. Connect a 0.1μF ceramic capacitor between BST and LX.
External Power Supply Input. Reduces the Internal-LDO Loss. Connect it to OUT when it is
programmed for 5V output. When EXTVCC is not used, connect it to SGND.
3
EXTVCC
4-7
OUT
Module Output Pins. Connect the output capacitor C
from OUT to PGND.
OUT
Output Feedback Connection. Connect FB to the output-voltage node (OUT) for MAXM17633
and MAXM17634. Connect FB to the center of the external resistor-divider from OUT to SGND
for MAXM17635 to set the output voltage.
8
9
FB
RT
Programmable Switching Frequency Input. Connect a resistor from RT to SGND to set the
switching frequency of the module between 400kHz and 2.2MHz. Leave RT open for the default
500kHz frequency. See the Setting the Switching Frequency (RT) section for more details.
10
11
SGND
SS
Signal Ground Pin.
Soft-Start Input. Connect a capacitor from SS to SGND to set the soft-start time.
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MAXM17633/MAXM17634/
MAXM17635
4.5V to 36V, 2A Himalaya uSLIC
Step-Down Power Modules
Pin Description (continued)
PIN
NAME
FUNCTION
MODE/SYNC Pin. Configures the module to operate in PWM, PFM, or DCM mode of
operation. Leave MODE/SYNC unconnected for PFM operation (pulse skipping at light loads).
Connect MODE/SYNC to SGND for constant-frequency PWM operation at all loads. Connect
12
MODE/SYNC
MODE/SYNC to V
for DCM operation at light loads.The module can be synchronized to an
CC
external clock using this pin. See the Mode Selection and External Synchronization
(MODE/SYNC) section for more details.
13
14
V
5V LDO Output of the module. Bypass V
with a 2.2μF ceramic capacitor to SGND.
CC
CC
Open-Drain RESET Output. The RESET output is driven low if FB drops below 92% of its set
value. RESET goes high 1024 cycles after FB rises above 95% of its set value.
RESET
Enable/Undervoltage Lockout Pin. Drive EN/UVLO high to enable the output. Connect
EN/UVLO to the center of the resistor-divider between IN and SGND to set the input voltage
at which the part turns on. Connect EN/UVLO to the IN pin for always-on operation.
Pull EN/UVLO low for disabling the module.
15
EN/UVLO
Power-Supply Input Pins. 4.5V to 36V input-supply range. Decouple to PGND with a capacitor;
place the capacitor close to the IN and PGND pins.
16-19
20-23
IN
Power Ground Pins. Connect externally to the power ground plane. Refer to the MAXM17633
Evaluation Kit data sheet for a layout example.
PGND
Exposed Pad. Connect EP to the PGND pins of module. Also, connect EP to a large PGND plane
with several thermal vias for the best thermal performance. Refer to the MAXM17633 EV Kit data
sheet for an example of the correct method for EP connection and thermal vias.
—
EP
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MAXM17633/MAXM17634/
MAXM17635
4.5V to 36V, 2A Himalaya uSLIC
Step-Down Power Modules
Functional Diagrams
MAXM17633/MAXM17634/MAXM17635
BST
IN
EN/UVLO
ENOK
LX
1.215V
3.3µH
HICCUP
RT
OUT
PGND
FB
PWM/PFM/HICCUP
LOGIC
OSCILLATOR
MODE
SELECTION
MODE/SYNC
EXTVCC
S1
IN
S3
S2
LDO
R1
R2
ERROR AMPLIFIER/
LOOP COMPESATION
THERMAL SHUTDOWN
V
CC
SGND
RESET
SLOPE
COMPENSATION
CURRENT
SENSE
SOFT-START
LOGIC
SS
RESET
LOGIC
HICCUP
ENOK
FB
S1: CLOSED; S2, S3: OPEN FOR MAXM17635
S1: OPEN; S2, S3: CLOSED FOR MAXM17633/MAXM17634
R1: 176.6kΩ, R2: 38.8kΩ FOR MAXM17634
R1: 103.4kΩ, R2: 38.8kΩ FOR MAXM17633
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MAXM17633/MAXM17634/
MAXM17635
4.5V to 36V, 2A Himalaya uSLIC
Step-Down Power Modules
(higher than V
frequency DCM mode at light loads. State changes on the
MODE/SYNC pin are ignored during normal operation.
), the modules operate in constant-
M_DCM
Detailed Description
The MAXM17633, MAXM17634, and MAXM17635 are a
family of high-frequency synchronous step-down DC-DC
converter modules, with integrated controller, MOSFETs,
compensation components, and inductor that operate
over a wide input voltage range. The modules deliver
an output current of up to 2A. The MAXM17633 and
MAXM17634 are fixed 3.3V and 5V output modules,
respectively. The MAXM17635 is an adjustable-output
voltage (0.9V to 12V) module. When EN/UVLO and the
The internal oscillator of the modules can be synchro-
nized to an external clock signal through the MODE/
SYNC pin when the part is programmed to DCM or PWM
mode of operation. SYNC is not supported in PFM mode.
The internal oscillator frequency changes to an external
clock frequency when 16 external clock rising edges are
detected on the MODE/SYNC pin. The external clock
frequency must be between 1.1 x f
and 1.4 x f
,
V
threshold are ascertained, an internal power-up
SW
SW
CC
where f
is the switching frequency programmed by
sequence ramps up the error-amplifier reference, result-
SW
the resistor connected between the RT pin to SGND. The
external clock pulse width should be greater than 50ns
and the off time duration should be greater than 160ns.
See the Mode Sync section in the Electrical Characteristics
table for details.
ing 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 1024 clock cycles after the output voltage reaches
95% of regulation. The modules select either PFM or
forced-PWM or DCM mode depending on the state of the
MODE/SYNC pin at power-up. By pulling the EN/UVLO
pin low, the modules enter shutdown mode and consume
only 2.8μA (typ) of standby current.
PWM Mode Operation
In PWM mode, the internal inductor current is allowed
to go negative. PWM operation is useful in frequency
sensitive applications and provides fixed switching
frequency operation at all loads. However, the PWM
mode of operation gives lower efficiency at light loads
compared to PFM and DCM modes of operation.
The modules employ peak-current-mode control architec-
ture. An internal error amplifier compares the feedback
voltage to a fixed reference voltage and generates an
error voltage. The error voltage is compared to the sum
of the current-sense voltage and slope-compensation
voltage by a PWM comparator to set the on-time. At each
rising edge of the clock, the high-side MOSFET turns on
and remains on until either the appropriate or maximum
duty cycle is reached, or the peak current limit is detected.
During the high-side MOSFET’s on-time, the internal
inductor current ramps up. During the second half of the
switching cycle, the high-side MOSFET turns off and the
low-side MOSFET turns on. The inductor in the module
releases the stored energy as its current ramps down and
provides current to the output.
PFM Mode Operation
PFM mode of operation disables negative internal induc-
tor current and additionally skips pulses at light loads for
high efficiency. In PFM mode, the module output current
is forced to a fixed peak of I
(1.17A typ) every clock
PFM
cycle until the output rises to 102.3% of the set nominal
output voltage. Once the output reaches 102.3% of the
set nominal output voltage, both the high-side and low-
side FETs are turned off and the device enters hibernate
operation until the load discharges the output to 101.1%
of the set nominal output voltage. Most of the internal
blocks are turned off in hibernate operation to save
quiescent current. After the output falls below 101.1%
of the set nominal output voltage, the module comes
out of hibernate operation, turns on all internal blocks,
and again commences the process of delivering pulses
of energy to the output until it reaches 102.3% of the
set nominal output voltage. The advantage of the PFM
mode is higher efficiency at light loads because of lower
quiescent current drawn from supply. The disadvantage is
that the output-voltage ripple is higher compared to PWM
or DCM modes of operation and switching frequency is
not constant at light loads.
Mode Selection and
External Synchronization (MODE/SYNC)
The modules support PWM, PFM, and DCM modes
of operation. The modules enter the required mode of
operation based on the setting of the MODE/SYNC pin
as detected within 1.5ms after V
and EN/UVLO volt-
CC
ages exceed their respective rising thresholds (V
,
CC_UVR
V
ENR
). If the state of the MODE/SYNC pin is open, the
modules operate in PFM mode at light loads. If the state
of the MODE/SYNC pin is low (lower than V ),
the modules operate in constant-frequency PWM mode
at all loads. If the state of the MODE/SYNC pin is high
M_PWM
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MAXM17633/MAXM17634/
MAXM17635
4.5V to 36V, 2A Himalaya uSLIC
Step-Down Power Modules
DCM Mode Operation
RESET Output
DCM mode of operation features constant frequency
operation down to lighter loads than PFM mode, by
disabling negative internal inductor current at light loads.
DCM operation offers efficiency performance that lies
between PWM and PFM modes. The output voltage ripple
in DCM mode is comparable to PWM mode and relatively
lower compared to PFM mode.
The modules include an open-drain RESET pin to
monitor the status of output voltage. The RESET pin
requires an external pullup resistor. RESET goes high
impedance with a delay of 1024 switching cycles after the
regulator output voltage increases above 95% of its nomi-
nal set value and goes low when the output voltage falls
below 92% of its nominal set value. RESET also goes low
during thermal shutdown or when the EN/UVLO pin goes
below the falling threshold.
Linear Regulator (V
and EXTVCC)
CC
The modules have an internal low dropout (LDO) regu-
lator that powers V from IN. This LDO is enabled
Prebiased Output
CC
during power-up or when EN/UVLO is above 0.75V (typ).
The modules are capable of soft-start into a prebiased
output, without discharging the output capacitor in all
modes. Such a feature is useful in applications where
digital integrated circuits with multiple rails are powered.
An internal switch connects the EXTVCC to V . The
CC
switch is open during power-up. If V
is above its UVLO
CC
threshold and if EXTVCC is greater than 4.7V (typ) then,
the internal LDO is disabled and V is powered from
CC
Overcurrent Protection/Hiccup Mode
EXTVCC. Powering V
from EXTVCC increases effi-
CC
The modules are provided with a robust overcurrent protec-
tion (OCP) scheme that protects the modules under over-
load and output short-circuit conditions. A cycle-by-cycle
peak current limit turns off the high-side MOSFET when-
ever the high-side switch current exceeds an internal limit
ciency at higher input voltages. Typical V
output volt-
CC
age is 5V. Bypass V
ceramic capacitor. V
to SGND with a 2.2µF low-ESR
powers the internal blocks and
CC
CC
the low-side MOSFET driver, and recharges the external
bootstrap capacitor.
of I
(3.55A typ). A runaway current limit on the
PEAK-LIMIT
The modules employ an undervoltage lockout circuit that
high-side switch current at the I
(4.43A typ)
RUNAWAY-LIMIT
forces the converter off when V
falls below V
CC
CC-UVF
protects the device under high input voltage, output short-
circuit conditions when there is insufficient output voltage
available to restore the module current that was built up
during the on period of the module. One occurrence of the
runaway current limit triggers a hiccup mode. In addition,
due to any fault, if the feedback voltage drops below 64%
of the nominal value any time after soft-start is completed,
the hiccup mode is activated. In hiccup mode, the modules
are protected by suspending switching for a hiccup timeout
period of 32,768 clock cycles of half the switching fre-
quency. Once the hiccup timeout period expires, soft-start
is attempted again. Note that when soft-start is attempted
under overload condition, if feedback voltage does not
exceed 64% of the nominal value, the modules continue to
switch at half the programmed switching frequency for the
time duration of the programmed soft-start time and 1024
clock cycles. Hiccup mode of operation ensures low power
dissipation under output short-circuit conditions.
(3.8 typ). The modules can be immediately enabled again
when V > V (4.2 typ). The 400mV UVLO hyster-
esis prevents chattering on power-up/power-down.
CC
CC-UVR
In applications where the module output is connected
to the EXTVCC pin, if the output is shorted to ground
then the transfer from EXTVCC to internal LDO happens
seamlessly without any impact on the normal functional-
ity. Connect the EXTVCC pin to SGND when not in use.
Enable/Undervoltage Lockout (EN/UVLO),
Soft-Start (SS)
When EN/UVLO voltage is above 1.215V (typ), the
internal error-amplifier reference voltage of the module
starts to ramp up. The duration of the soft-start ramp is
programmable through the choice of an external capaci-
tor put at the SS pin, allowing a smooth increase of the
output voltage. Driving EN/UVLO low disables both power
MOSFETs, as well as other internal circuitry, and reduces
IN quiescent current to below 2.8μA (typ). EN/UVLO can
be used as an input-voltage UVLO adjustment input. An
external voltage-divider between IN and EN/UVLO to
SGND adjusts the input voltage at which the device turns
on or turns off. If input UVLO programming is not desired,
connect EN/UVLO to IN (see the Electrical Characteristics
table for EN/UVLO rising and falling threshold voltages).
The MAXM17633/34/35 are designed to support a maxi-
mum load current of 2A. The inductor ripple current is
calculated as follows:
V
− V
− 0.233× I
OUT OUT
IN
∆I =
×
L × f
SW
V
+ 0.188× I
OUT
OUT
V
− 0.045×I
OUT
IN
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MAXM17633/MAXM17634/
MAXM17635
4.5V to 36V, 2A Himalaya uSLIC
Step-Down Power Modules
where:
The input capacitor RMS current requirement (I
defined by the following equation:
) is
RMS
V
V
= Steady-state output voltage
OUT
= Operating input voltage for given V
IN
OUT
V
× V − V
IN OUT
(
)
OUT
I
=I
×
OUT(MAX )
RMS
f
= Switching frequency in MHz
SW
V
IN
L = Power module output inductance (3.3μH ±20%)
= Output (load) current
where, I
is the maximum load current. I
has
RMS
OUT(MAX)
I
OUT
a maximum value when the input voltage equals twice the
The following condition should be satisfied at the desired
load current, I
output voltage (V = 2 x V
), so
IN
OUT
:
OUT
I
∆I
OUT(MAX)
I
+
< 3.1
I
=
OUT
RMS(MAX )
2
2
Thermal Overload Protection
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 limits the total power dis-
sipation in the device. When the junction temperature
exceeds +165°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.
1− D
(
)
C
= I
×D×
OUT(MAX)
Applications Information
IN
η× f
× ∆V
SW
IN
Operating Input Voltage Range
The minimum and maximum operating input voltages for
a given output voltage setting is calculated as follows:
where:
D = Duty ratio of the converter
= Switching frequency
f
V
+ 0.188× I
SW
(
)
OUT
OUT
V
=
+ 0.045×I
IN(MIN)
OUT
ΔV = Allowable input voltage ripple
IN
1− t
× f
(
)
OFF(MIN)
SW
η = Efficiency
V
OUT
In applications where the source is located away and
distant from the device input, an appropriate electrolytic
capacitor should be added to provide necessary damping
of potential oscillations caused by the inductance of the
input power path and input ceramic capacitor.
V
=
IN(MAX)
t
× f
ON(MIN)
SW
Also, for duty cycle > 0.5,
> 4.25 x V
V
+ 0.65 x I
− 33.48 x f
IN(MIN)
OUT
OUT SW
where:
Selection of Output capacitor
V
= Steady-state output voltage,
= Load current,
Small ceramic X7R-grade capacitors are sufficient and
recommended for output-voltage generation. The output
capacitor has two functions. It provides smooth output
voltage and, stores sufficient energy to support the out-
put voltage under load transient conditions stabilizing the
internal control loop of the module. Usually the output
capacitor is sized to support a load step 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:
OUT
I
t
t
f
OUT
= Minimum OFF time (160ns),
= Minimum ON time (80ns).
OFF(MIN)
ON(MIN)
= Switching frequency in MHz.
SW
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 switching of the module.
5.5
C
=
OUT
f
× V
OUT
C
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MAXM17633/MAXM17634/
MAXM17635
4.5V to 36V, 2A Himalaya uSLIC
Step-Down Power Modules
where:
Setting the Output Voltage
Set the output voltage with a resistive voltage-divider
connected from the output-voltage node (OUT) to SGND
(see Figure 2). Connect the center node of the divider to
the FB pin for MAXM17635. Connect the output-voltage
node (OUT) directly to the FB pin for MAXM17633 and
MAXM17634. Use the following procedure to choose the
resistive voltage-divider values:
C
= Output capacitance in μF
OUT
V
OUT
= Output voltage
f
C
= Desired crossover frequency. f is chosen to be the
C
th
lowest value between 1/10 of the switching frequency
and 80kHz.
Derating of ceramic capacitors with DC-voltage at appro-
priate AC voltage (equal to the steady-state output
voltage ripple) must be considered while selecting the
output capacitor.
Calculate resistor R1 from the output to the FB pin as
follows:
270
R1=
Selection of SS capacitor
f
× C
OUT
C
The modules implement adjustable soft-start operation to
reduce inrush current. A capacitor connected from the SS pin
to SGND programs the soft-start time. The selected output
where R1 is in kΩ, crossover frequency f is in Hz, and
the derated value of the output capacitor C
Calculate resistor R2 connected from the FB pin to SGND
as follows:
C
is in F.
OUT
capacitance (C ) and the output voltage (V
SEL
) determine
OUT
the minimum required soft-start capacitor as follows:
−6
CSS ≥ 28 x 10 x C
x V
OUT
SEL
R1× 0.9
R2 =
The soft-start time (t ) is related to the capacitor con-
nected at SS (C ) by the following equation:
SS
V
− 0.9
(
)
OUT
SS
R2 is in kΩ.
C
SS
t
=
SS
Select an appropriate f and C
combination of R2 and R1 is less than 50kΩ.
so that the parallel
C
OUT
−6
5.55× 10
For example, to program a 1ms soft-start time, a 5.6nF
capacitor should be connected from the SS pin to SGND.
Note that, during start-up, modules operate at half the
programmed switching frequency until the output voltage
reaches 66.7% of set output nominal voltage.
V
R
IN
MAXM17633
MAXM17634
MAXM17635
U
Setting the Input
Undervoltage-Lockout Level
EN/UVLO
R
B
The modules offer an adjustable input undervoltage lock-
out level. Set the voltage at which the module turns on with
a resistive voltage-divider connected from IN to GND (see
Figure 1). Connect the center node of the divider to EN/UVLO.
Figure 1. Setting the EN/UVLO Network
Choose R to be 3.3MΩ (max), and then calculate R
U
B
as follows:
V
R
×1.215
OUT
U
R
=
B
MAXM17635
V
– 1.215
(
)
INU
R1
where V
is the voltage at which the module is required
INU
FB
to turn on. See Table 1 to set the proper VINU voltage
greater than or equal to the minimum input voltage for
each desired output voltage.
R2
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.
Figure 2. Setting the Output Voltage
Maxim Integrated
│ 23
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MAXM17633/MAXM17634/
MAXM17635
4.5V to 36V, 2A Himalaya uSLIC
Step-Down Power Modules
Setting the Switching Frequency (RT)
1
P
= P
×
−1 ,
The switching frequency of the module can be pro-
grammed from 400kHz to 2.2MHz by using a resistor
connected from the RT pin to SGND. The switching
LOSS
OUT
η
Where η is the efficiency of the module at the desired oper-
ating conditions. See Typical Operating Characteristics
for efficiency, or measure the efficiency to determine total
power dissipation. An EE-SIM model is available for the
MAXM17633/MAXM17634/MAXM17635, to simulate effi-
frequency (f ) is related to the resistor (R ) connected
SW
RT
at the RT pin by the following equation:
21000
R
≅
−1.7
RT
f
SW
ciency and power loss. The junction temperature T of the
J
module can be estimated at any given maximum ambient
Where R is in kΩ and f
open enables the device to operate at the default switch-
ing frequency of 500kHz. See Table 1 for R resistor
is in kHz. Leaving the RT pin
RT
SW
temperature T from the following equation:
A
T = T + [θ x P ]
LOSS
J
A
JA
RT
values for a few common switching frequencies.
For the MAXM17633/MAXM17634/MAXM17635 evalua-
tion board, the thermal resistance from junction to ambi-
Power Dissipation
ent (θ ) is 25°C/W. Operating the module at junction
JA
The power dissipation inside the module leads to an
increase in the junction temperature of the modules. The
power loss inside the modules at full load can be esti-
mated as follows:
temperatures greater than +125°C degrades operating
lifetimes.
Table 1. Selection of Components
V
V
V
f
R1
(kΩ)
R2
(kΩ)
R
INMIN
(V)
INMAX
(V)
OUT
(V)
SW
RT
(kΩ)
PART NO.
MAXM17633
MAXM17634
C
C
OUT
IN
(kHz)
1 x 4.7µF 1206 50V
GRM31CR71H475KA12#
1 x 47µF 1210 10V
GRM32ER71A476KE15#
4.5
7
36
36
30
3.3
5
800
SHORT OPEN 24.3
SHORT OPEN 19.1
1x 4.7µF 1206 50V
GRM31CR71H475KA12#
1 x 22µF 1210 25V
GRM32ER71E226KE15#
1000
400
2x 4.7µF 1206 50V
GRM31CR71H475KA12#
5 x 47µF 1210 10V
GRM32ER71A476KE15#
4.5
0.9
39.2
51.1
64.9
86.6
OPEN 51.1
2 x 47µF, 10V, 1 x 22µF 25V, 1210
GRM32ER71A476KE15#,
GRM32ER71E226KE15#
2x 4.7µF 1206 50V
GRM31CR71H475KA12#
4.5
4.5
4.5
36
36
36
1.2
1.5
1.8
600
600
600
150
95.3
86.6
33.2
33.2
33.2
2x 4.7µF 1206 50V
GRM31CR71H475KA12#
2 x 47µF 1210 10V
GRM32ER71A476KE15#
1 x 47µF, 10V, 1 x 22µF 25V, 1210
GRM32ER71A476KE15#
GRM32ER71E226KE15#
2x 4.7µF 1206 50V
GRM31CR71H475KA12#
MAXM17635
1 x 4.7µF 1206 50V
GRM31CR71H475KA12#
1 x 47µF 1210 10V
GRM32ER71A476KE15#
4.5
4.5
7
36
36
36
36
2.5
3.3
5
700
800
118
110
215
453
64.9
41.2
46.4
36.5
28.3
24.3
19.1
10
1 x 4.7µF 1206 50V
GRM31CR71H475KA12#
1 x 47µF 1210 10V
GRM32ER71A476KE15#
1 x 4.7µF 1206 50V
GRM31CR71H475KA12#
1 x 22µF 1210 25V
GRM32ER71E226KE15#
1000
1800
1 x 2.2µF 1206 50V
C3216X7R1H225K160AE
1 x 10µF 1210 50V
GRM32ER71H106KA12#
18
12
Maxim Integrated
│ 24
www.maximintegrated.com
MAXM17633/MAXM17634/
MAXM17635
4.5V to 36V, 2A Himalaya uSLIC
Step-Down Power Modules
● Keep the resistive feedback divider as close as pos-
PCB Layout Guidelines
Careful PCB layout is critical to achieve low switching
losses and clean, stable operation.
sible to the FB pin.
● Connect all of the PGND connections to as large as
copper plane area as possible on the top and bottom
layers.
Use the following guidelines for good PCB layout:
● Keep the input capacitors as close as possible to the
● Use multiple vias to connect internal PGND planes to
IN and PGND pins.
the top layer PGND plane.
● Keep the output capacitors as close as possible to the
● Refer to the MAXM17633/MAXM17634/MAXM17635
OUT and PGND pins.
EV kit layout for first pass success.
PGND PLANE
C1
IN PLANE
LX
PGND
C5
BST
IN
EXTVCC
R6
EP
C2
EN/
UVLO
R5
R4
RESET
OUT
V
CC
SGND
MODE/
SYNC
FB
RT
SS
C3
R3
C4
R1
R2
OUT PLANE
SGND PLANE
Figure 3. Layout Guidelines
Maxim Integrated
│ 25
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MAXM17633/MAXM17634/
MAXM17635
4.5V to 36V, 2A Himalaya uSLIC
Step-Down Power Modules
Typical Application Circuits
Typical Application Circuit—Fixed 3.3V Output
V
V
IN
OUT
3.3V, 2A
4.5V TO 36V
IN
OUT
C2
C1
4.7µF
47µF
EN/UVLO
EXTVCC
V
CC
FB
V
CC
MAXM17633
C3
2.2µF
MODE/SYNC
BST
C5
0.1µF
SS
RT
LX
V
CC
C4
5600pF
RESET
R4
R3
24.3kΩ
100kΩ
SGND
PGND
C1 = MURATA 4.7µF/X7R/50V/1206 (GRM31CR71H475KA12#)
C2 = MURATA 47µF/X7R/10V/1210 (GRM32ER71A476KE15#)
C3 = MURATA 2.2µF/X7R/6.3V/0603 (GRM188R70J225KE15#)
f
= 800kHz
SW
Typical Application Circuit—Fixed 5V Output
V
V
OUT
IN
5V, 2A
7V TO 36V
IN
OUT
C2
22µF
C1
4.7µF
EN/UVLO
EXTVCC
FB
V
CC
V
CC
MAXM17634
C3
2.2µF
MODE/SYNC
BST
C5
0.1µF
SS
RT
LX
V
CC
C4
5600pF
RESET
R4
R3
19.1kΩ
100kΩ
SGND
PGND
C1 = MURATA 4.7µF/X7R/50V/1206 (GRM31CR71H475KA12#)
C2 = MURATA 22µF/X7R/25V/1210 (GRM32ER71E226KE15#)
C3 = MURATA 2.2µF/X7R/6.3V/0603 (GRM188R70J225KE15#)
f
= 1MHz
SW
Maxim Integrated
│ 26
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MAXM17633/MAXM17634/
MAXM17635
4.5V to 36V, 2A Himalaya uSLIC
Step-Down Power Modules
Typical Application Circuits (continued)
Typical Application Circuit—Adjustable 2.5V Output
V
V
IN
OUT
2.5V, 2A
4.5V TO 36V
IN
OUT
C2
C1
4.7µF
47µF
R1
EN/UVLO
EXTVCC
118kΩ
V
CC
FB
V
CC
MAXM17635
C3
2.2µF
MODE/SYNC
BST
C5
0.1µF
R2
64.9kΩ
SS
RT
LX
V
CC
C4
5600pF
RESET
R4
100kΩ
R3
28.3kΩ
SGND
PGND
C1 = MURATA 4.7µF/X7R/50V/1206 (GRM31CR71H475KA12#)
C2 = MURATA 47µF/X7R/10V/1210 (GRM32ER71A476KE15#)
C3 = MURATA 2.2µF/X7R/6.3V/0603 (GRM188R70J225KE15#)
f
= 700kHz
SW
Typical Application Circuit—Adjustable 12V Output
V
V
IN
OUT
12V, 2A
18V TO 36V
IN
OUT
C2
10µF
C1
2.2µF
R1
EN/UVLO
EXTVCC
FB
453kΩ
V
CC
V
CC
MAXM17635
C3
2.2µF
MODE/SYNC
BST
C5
0.1µF
R2
36.5kΩ
SS
RT
LX
V
CC
C4
5600pF
RESET
R4
100kΩ
R3
10kΩ
SGND
PGND
C1 = MURATA 4.7µF/X7R/50V/1206 (GRM31CR71H475KA12#)
C2 = MURATA 10µF/X7R/50V/1210 (GRM32ER71H106KA12#)
C3 = MURATA 2.2µF/X7R/6.3V/0603 (GRM188R70J225KE15#)
f
= 1.8MHz
SW
Maxim Integrated
│ 27
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MAXM17633/MAXM17634/
MAXM17635
4.5V to 36V, 2A Himalaya uSLIC
Step-Down Power Modules
Ordering Information
PART NUMBER
MAXM17633AMG+
MAXM17633AMG+T
MAXM17634AMG+
MAXM17634AMG+T
MAXM17635AMG+
MAXM17635AMG+T
TEMP RANGE
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
PIN-PACKAGE
V
OUT
24-pin 4mm x 4mm x 1.75mm uSLIC package
24-pin 4mm x 4mm x 1.75mm uSLIC package
24-pin 4mm x 4mm x 1.75mm uSLIC package
24-pin 4mm x 4mm x 1.75mm uSLIC package
24-pin 4mm x 4mm x 1.75mm uSLIC package
24-pin 4mm x 4mm x 1.75mm uSLIC package
Fixed 3.3V
Fixed 3.3V
Fixed 5V
Fixed 5V
Adjustable
Adjustable
+ Denotes a lead(Pb)-free/RoHS-compliant package.
T= Tape and reel.
Maxim Integrated
│ 28
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MAXM17633/MAXM17634/
MAXM17635
4.5V to 36V, 2A Himalaya uSLIC
Step-Down Power Modules
Revision History
REVISION REVISION
PAGES
CHANGED
DESCRIPTION
NUMBER
DATE
0
7/19
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.
│ 29
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