LTC3672B-1 Series

Monolithic Fixed-Output 400mA Buck Regulator with Dual 150mA LDOs in 2mm x 2mm DFN

Catalog

Monolithic Fixed-Output 400mA Buck Regulator with Dual 150mA LDOs in 2mm x 2mm DFN

Part	Supplier Device Package	Voltage/Current - Output 2	Operating Temperature [Max]	Operating Temperature [Min]	Voltage/Current - Output 3	Voltage/Current - Output 1 [custom]	Voltage/Current - Output 1 [custom]	Mounting Type	Package / Case	Frequency - Switching	Voltage - Supply [Min]	Voltage - Supply [Max]	Topology	Number of Outputs
Analog Devices LTC3672BEDC-1#TRMPBF	8-DFN (2x2)	1.2 V 150 mA	85 °C	-40 °C	2.8 V 150 mA	400 mA	1.8 V	Surface Mount	8-WFDFN Exposed Pad	2.25 MHz	2.9 V	5.5 V	Linear (LDO) (2) Step-Down (Buck) Synchronous (1)	3
Analog Devices LTC3672BEDC-2#TRPBF	8-DFN (2x2)	2.8 V 150 mA	85 °C	-40 °C		400 mA	1.2 V	Surface Mount	8-WFDFN Exposed Pad	2.25 MHz	2.9 V	5.5 V	Linear (LDO) (2) Step-Down (Buck) Synchronous (1)	3
Analog Devices LTC3672BEDC-1#TRPBF	8-DFN (2x2)	1.2 V 150 mA	85 °C	-40 °C	2.8 V 150 mA	400 mA	1.8 V	Surface Mount	8-WFDFN Exposed Pad	2.25 MHz	2.9 V	5.5 V	Linear (LDO) (2) Step-Down (Buck) Synchronous (1)	3
Analog Devices LTC3672BEDC-2#TRMPBF	8-DFN (2x2)	2.8 V 150 mA	85 °C	-40 °C		400 mA	1.2 V	Surface Mount	8-WFDFN Exposed Pad	2.25 MHz	2.9 V	5.5 V	Linear (LDO) (2) Step-Down (Buck) Synchronous (1)	3

Catalog

Monolithic Fixed-Output 400mA Buck Regulator with Dual 150mA LDOs in 2mm x 2mm DFN

Key Features

• Triple Output Supply From a Single 2.9V to 5.5V Input

• Buck DC/DC: Fixed 1.8V Output, Up to 400mA

• LDO1: Fixed 1.2V Output, Up to 150mA

• LDO2: Fixed 2.8V 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 x 2mm x 0.75mm DFN Package

Description

The LTC3672B-1 is a triple power supply composed of a 400mA synchronous buck regulator and two 150mA low dropout linear regulators (LDOs), where one of the LDOs can be powered from the buck output to improve efficiency. Constant-frequency 2.25MHz operation is maintained down to very light loads. The input supply range of 2.9V to 5.5V is especially well-suited for single-cell Lithium-Ion and Lithium-Polymer applications, and for powering low voltage ASICs from 3.3V or 5V rails.The LTC3672B-1 regulates 1.8V at the buck output, 1.2V at the LDO1 output, and 2.8V at the LDO2 output. External component count is minimal—all that is needed is a single inductor, an input capacitor, and output capacitors for each of the three outputs. Control loop compensation is internal to the LTC3672B-1.The LTC3672B-1 is available in a 2mm x 2mm x 0.75mm 8-Lead DFN package.Buck VoutLDO 1LDO 2LTC3672B-11.8V1.2V2.8VLTC3672B-21.2V2.8V1.8VApplicationsDMB CellphonesHandheld Products (PDA, PMP, GPS)Multivoltage Power for Digital Logic, I/O, FPGAs, CPLDs, ASICs, CPUs, and RF Chipsets