DC-DC Converter. MAX17631 Datasheet

MAX17631 Converter. Datasheet pdf. Equivalent

Part MAX17631
Description Synchronous Step-Down DC-DC Converter
Feature Click here for production status of specific part numbers. MAX17631 EVALUATION KIT AVAILABLE 4.5V t.
Manufacture Maxim Integrated
Datasheet
Download MAX17631 Datasheet



MAX17631
Click here for production status of specific part numbers.
MAX17631
EVALUATION KIT AVAILABLE
4.5V to 36V, 1.5A, High-Efficiency,
Synchronous Step-Down DC-DC Converter
General Description
The MAX17631 is a high-efficiency, high-voltage, syn-
chronous step-down DC-DC converter with integrated
MOSFETs operating over an input-voltage range of 4.5V
to 36V. It can deliver up to 1.5A current. The MAX17631
is available in three variants, MAX17631A, MAX17631B
and MAX17631C. The MAX17631A and MAX17631B
are fixed 3.3V and fixed 5V output parts, respectively.
The MAX17631C is an adjustable output voltage (from
0.9V up to 90% of VIN) part. Built-in compensation across
the output-voltage range eliminates the need for external
compensation components.
The MAX17631 features peak-current-mode control
architecture. The device can be operated in the forced
pulse- width modulation (PWM), or pulse-frequency
modulation (PFM), or discontinuous-conduction mode
(DCM) to enable high efficiency under full-load and light-
load conditions. The MAX17631 offers a low minimum on-
time that allows high switching frequencies and a smaller
solution size.
The feedback-voltage regulation accuracy over -40°C to
+125°C for the MAX17631A/MAX17631B/MAX17631C is
±1.2%.The device is available in a 16-pin (3mm x 3mm)
TQFN package. Simulation models are available.
Applications
● Industrial Control Power Supplies
● General-Purpose Point-of-Load
● Distributed Supply Regulation
● Base Station Power Supplies
● Wall Transformer Regulation
● High Voltage Single-Board Systems
Ordering Information appears at end of data sheet.
Typical Application Circuit
Benefits and Features
● Reduces External Components and Total Cost
• No Schottky - Synchronous Operation
• Internal Compensation Components
• All-Ceramic Capacitors, Compact Layout
● Reduces Number of DC-DC Regulators to Stock
• Wide 4.5V to 36V Input
• Adjustable Output Voltage Range from
0.9V up to 90% of VIN
• Delivers Up to 1.5A Over the Temperature Range
• 400kHz to 2.2MHz Adjustable Frequency with
External Clock Synchronization
• Available in a 16-Pin, 3mm x 3mm TQFN Package
● Reduces Power Dissipation
Peak Efficiency of 95%
• PFM and DCM Modes Enable Enhanced
Light-Load Efficiency
• Auxiliary Bootstrap Supply (EXTVCC) for
Improved Efficiency
2.8μA Shutdown Current
● Operates Reliably in Adverse Industrial Environments
• Hiccup-Mode Overload Protection
• Adjustable and Monotonic Startup with Prebiased
Output Voltage
• Built-In Output-Voltage Monitoring with RESET
• Programmable EN/UVLO Threshold
• Overtemperature Protection
• High Industrial -40°C to +125°C Ambient Operating
Temperature Range / -40°C to +150°C Junction
Temperature Range
C3
2.2µF
C2
5600pF
RT EN/UVLO VIN BST
MODE/SYNC
VCC
SGND
MAX17631B
LX
FB
SS
RESET
EXTVCC
PGND
C5
0.1µF L1
15µH
C1
2.2µF
C4
22µF
EP
VIN
6.5V TO 36V
VOUT
5V,1.5A
fSW : 400kHz
C1: 2.2µF/50V/X7R/1206 (C3216X7R1H225K160AE)
L1: 15µH (XAL5050-153ME)
C4: 22µF/25V/X7R/1210 (GRM32ER71E226ME15)
19-100462; Rev 0; 12/18



MAX17631
MAX17631
4.5V to 36V, 1.5A, High-Efficiency,
Synchronous Step-Down DC-DC Converter
Absolute Maximum Ratings
VIN to PGND..........................................................-0.3V to +40V
EN/UVLO to SGND.....................................-0.3V to (VIN + 0.3V)
LX to PGND................................................-0.3V to (VIN + 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
BST to VCC............................................................-0.3V to +40V
RESET, SS, MODE/SYNC, VCC, RT to SGND....-0.3V to +6.5V
FB to SGND (MAX17631A & MAX17631B)............-5.5V to 6.5V
FB to SGND (MAX17631C)....................................-0.3V to 6.5V
PGND to SGND.....................................................-0.3V to +0.3V
LX Total RMS Current.........................................................±3.5A
Output Short-Circuit Duration.....................................Continuous
Continuous Power Dissipation (Multilayer Board)
(TA = +70°C, derate 20.8mW/°C above +70°C.).....1666.7mW
Operating Temperature Range (Note 1)............ -40°C to +125°C
Junction Temperature.......................................................+150°C
Storage Temperature Range............................. -65°C to +150°C
Lead Temperature (soldering, 10s).................................. +300°C
Soldering Temperature (reflow)........................................+260°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these
or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect
device reliability.
Package Information
PACKAGE TYPE: 16-PIN TQFN
Package Code
T1633+5C
Outline Number
21-0136
Land Pattern Number
90-0032
THERMAL RESISTANCE, FOUR-LAYER BOARD (Note 2):
Junction to Ambient (θJA)
Junction to Case (θJC)
38​°C/W
10​°C/W
For the latest package outline information and land patterns (footprints), go to www.maximintegrated.com/packages. Note that a “+”,
“#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing
pertains to the package regardless of RoHS status.
Note 1: Junction temperature greater than +125°C degrades operating lifetimes.
Note 2: Package thermal resistances were obtained using the MAX17631 evaluation kit with no airflow.
www.maximintegrated.com
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