Datasheet Linear Technology LTC3672BEDC-2#TRPBF

LTC3672B-2
Monolithic Fixed-Output
400mA Buck Regulator with Dual
150mA LDOs in 2mm × 2mm DFN
FEATURES DESCRIPTION n The LTC®3672B-2 is a triple power supply composed of
a 400mA synchronous buck regulator and two 150mA
low-dropout linear regulators (LDOs). Constant-frequency
2.25MHz operation is maintained down to very light loads.
The input supply range of 2.9V to 5.5V is especially wellsuited for single-cell Lithium-Ion and Lithium-Polymer
applications, and for powering low voltage ASICs from
3.3V or 5V rails. Triple Output Supply From a Single 2.9V to 5.5V Input
Buck DC/DC: Fixed 1.2V Output, Up to 400mA
LDO1: Fixed 2.8V Output, Up to 150mA
LDO2: Fixed 1.8V Output, Up to 150mA
±2.5% Reference Accuracy
Constant-Frequency 2.25MHz Operation
Minimum External Component Count
Current Mode Operation for Excellent Line and Load
Transient Response
Internal Soft-Start for Each Output
Single Enable Pin Turns On/Shuts Down All Three
Outputs
Tiny 2mm × 2mm × 0.75mm DFN Package APPLICATIONS n DMB and DVB-H Cellphones …