LTC3631 - High Efficiency, High Voltage 100mA Synchronous Step-Down Converter

The LTC3631 is a high voltage, high efficiency step-down DC/DC converter with internal high side and synchronous power switches that draws only 12μA typical DC supply current at no load while maintaining output voltage regulation.

The LTC3631 can supply up to 100mA load current and features a programmable peak current limit that provides a simple method for optimizing efficiency in lower current applications. The LTC3631’s combination of Burst Mode® operation, integrated power switches, low quiescent current, and programmable peak current limit provides high efficiency over a broad range of load currents.

With its wide 4.5V to 45V input range and internal overvoltage monitor capable of protecting the part from 60V surges, the LTC3631 is a robust converter suited for regulating a wide variety of power sources. Additionally, the LTC3631 includes a precise run threshold and a soft‑start feature to guarantee that power system start-up is well-controlled in any environment.

The LTC3631 is available in the thermally enhanced 3mm × 3mm DFN and MS8E packages.

Features

Wide Input Voltage Range: Operation from 4.5V to 45V
Overvoltage Lockout Provides Protection Up to 60V
Internal High Side and Low Side Power Switches
No Compensation Required
100mA Output Current
Low Dropout Operation: 100% Duty Cycle
Low Quiescent Current: 12μA
0.8V ±1% Feedback Voltage Reference
Adjustable Peak Current Limit
Internal and External Soft-Start
Precise RUN Pin Threshold with Adjustable Hysteresis
3.3V, 5V and Adjustable Output Versions
Only Three External Components Required for Fixed Output Versions
Low Profile (0.75mm) 3mm × 3mm DFN and Thermally-Enhanced MS8E Packages

Typical Application

Applications

4mA to 20mA Current Loops
Industrial Control Supplies
Distributed Power Systems
Portable Instruments
Battery-Operated Devices
Automotive Power Systems

Packaging

Order Information

Part Number	Package	Temp	Price(1-99)	Price (1k)*
LTC3631EDD-3.3#PBF	3x3 DFN-8	E	$4.22	$2.95
LTC3631EDD-3.3#TRPBF	3x3 DFN-8	E		$3.01
LTC3631EDD-5#PBF	3x3 DFN-8	E	$4.22	$2.95
LTC3631EDD-5#TRPBF	3x3 DFN-8	E		$3.01
LTC3631EDD#PBF	3x3 DFN-8	E	$4.22	$2.95
LTC3631EDD#TRPBF	3x3 DFN-8	E		$3.01
LTC3631EMS8E-3.3#PBF	MS-8	E	$4.22	$2.95
LTC3631EMS8E-3.3#TRPBF	MS-8	E		$3.01
LTC3631EMS8E-5#PBF	MS-8	E	$4.22	$2.95
LTC3631EMS8E-5#TRPBF	MS-8	E		$3.01
LTC3631EMS8E#PBF	MS-8	E	$4.22	$2.95
LTC3631EMS8E#TRPBF	MS-8	E		$3.01
LTC3631IDD-3.3#PBF	3x3 DFN-8	I	$4.84	$3.39
LTC3631IDD-3.3#TRPBF	3x3 DFN-8	I		$3.45
LTC3631IDD-5#PBF	3x3 DFN-8	I	$4.84	$3.39
LTC3631IDD-5#TRPBF	3x3 DFN-8	I		$3.45
LTC3631IDD#PBF	3x3 DFN-8	I	$4.84	$3.39
LTC3631IDD#TRPBF	3x3 DFN-8	I		$3.45
LTC3631IMS8E-3.3#PBF	MS-8	I	$4.84	$3.39
LTC3631IMS8E-3.3#TRPBF	MS-8	I		$3.45
LTC3631IMS8E-5#PBF	MS-8	I	$4.84	$3.39
LTC3631IMS8E-5#TRPBF	MS-8	I		$3.45
LTC3631IMS8E#PBF	MS-8	I	$4.84	$3.39
LTC3631IMS8E#TRPBF	MS-8	I		$3.45

Demo Boards

Part Number	Description	Price
DC1499A	LTC3631EDD Demo Board \| 60V Transients, 4.5V ≤ VIN ≤ 45V, VOUT = 1.8V/3.3V/5V @ 100mA	$100.00