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MAX17633 Datasheet

Synchronous Step-Down DC-DC Converter

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MAX17633
EVALUATION KIT AVAILABLE
4.5V to 36V, 3.5A, High Efficiency,
Synchronous Step-Down, DC-DC Converter
General Description
The MAX17633 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 3.5A current. The MAX17633
is available in three variants MAX17633A, MAX17633B,
and MAX17633C. The MAX17633A and MAX17633B are
the fixed 3.3V and fixed 5V output voltage parts, respec-
tively. MAX17633C 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
components.
The MAX17633 features peak-current-mode control archi-
tecture. 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
MAX17633 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 MAX17633A, MAX17633B, and
MAX17633C is ±1.3%.The device is available in a com-
pact 20-pin (4mm × 4mm) 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
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 Range from 0.9V up to 90% of VIN
• Delivers up to 3.5A Over the Temperature Range
• 400kHz to 2.2MHz Adjustable Frequency with
External Synchronization
• Available in a 20-Pin, 4mm × 4mm TQFN Package
● Reduces Power Dissipation
Peak Efficiency > 93%
• 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
Ordering Information appears at end of data sheet.
Typical Application Circuit
C3
2.2µF
C2
5600pF
RT EN/UVLO IN
MODE/SYNC
BST
INTVCC MAX17633A LX
SGND
EXTVCC
SS
RESET
FB
PGND
C5
0.1µF L1
5.6µH
C1
2x2.2µF
C4
2x47µF
EP
VIN
4.5V TO 36V
VOUT
3.3V,3.5A
fSW : 500kHz
L1: 5.6µH (XAL5050-562ME)
C1: 2.2µF/100V/X7R/1210 (GRM32ER72A225KA35)
C4: 47uF/6.3V/X7R/1210 (GRM32ER70J476KE20)
19-100305; Rev 1; 2/19


Maxim Integrated Semiconductor Electronic Components Datasheet

MAX17633 Datasheet

Synchronous Step-Down DC-DC Converter

No Preview Available !

MAX17633
4.5V to 36V, 3.5A, High Efficiency,
Synchronous Step-Down, DC-DC Converter
Absolute Maximum Ratings
IN 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 INTVCC......................................................-0.3V to +40V
FB to SGND (MAX17633A & MAX17633B)..........-5.5V to +6.5V
FB to SGND (MAX17633C)..................................-0.3V to +6.5V
SS, MODE/SYNC, RESET, INTVCC,
RT to SGND......................................................-0.3V to +6.5V
PGND to SGND.....................................................-0.3V to +0.3V
LX Total RMS Current..............................................................4A
Output Short-Circuit Duration.....................................Continuous
Continuous Power Dissipation (Multilayer Board)
(TA = +70°C, derate 30.3mW/°C above +70°C.).....2424.2mW
Operating Temperature Range (Note1)................-40°C to 125°C
Junction Temperature........................................ -40°C to +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: 20-Pin TQFN
Package Code
T2044+4C
Outline Number
21-100172
Land Pattern Number
90-0409
THERMAL RESISTANCE, FOUR-LAYER BOARD (Note 2)
Junction to Ambient (θJA)
Junction to Case (θJC)
26°C/W
2°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 MAX17633 Evaluation Kit with no airflow.
www.maximintegrated.com
Maxim Integrated 2


Part Number MAX17633
Description Synchronous Step-Down DC-DC Converter
Maker Maxim Integrated
Total Page 23 Pages
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