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LTC3670EDDB
LTC3670 Monolithic 400mA Buck Regulator with Dual 150mA LDOs in 3mm × 2mm DFN DESCRIPTION FEATURES n n n n n n n n n n Triple Output Supply from a Single 2.5V to 5.5V Input 400mA Buck DC/DC Plus Dual 150mA LDOs in One IC Outputs Regulate Down to 0.8V ±2.5% Reference Accuracy Constant-Frequency 2.25MHz Operation Burst Mode® Operation for High Efficiency at Light Loads; IQ = 70μA, All Outputs Enabled Independent Enable Pin for Each Output Current Mode Operation for Excellent Line and Load Transient Response Internal Soft-Start for Each Output Tiny 12-Lead 3mm × 2mm × 0.75mm DFN Package APPLICATIONS n n n n n Handheld Products Portable Instruments Single-Cell Li-Ion/Li-Polymer Powered Devices DMB/DVB-H Multimedia Cell Phones Multivoltage Power for Digital Logic, I/O, FPGAs, CPLDs, ASICs, SoCs, CPUs and RF Chipsets The LTC®3670 is a triple power supply composed of a 400mA synchronous buck regulator and two 150mA low dropout linear regulators (LDOs). The input supply range of 2.5V to 5.5V is especially well-suited for single-cell Lithium-Ion and Lithium-Ion/Polymer applications, and for powering low voltage ASICs and SoCs from 3V, 3.3V or 5V rails. Regulated output voltages are programmed via external resistors. Each output has its own enable pin for maximum flexibility. The 400mA buck regulator features constant-frequency 2.25MHz operation, allowing small surface mount inductors and capacitors to be used. Burst Mode operation maintains high efficiency in light-load and no-load conditions. Internal control-loop compensation simplifies application design. The LTC3670 is available in a 0.75mm profile, 3mm × 2mm 12-lead DFN package. L, LT, LTC, LTM and Burst Mode are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Patents pending. TYPICAL APPLICATION Triple Power Supply with Independent Enables Demoboard VIN 3.3V TO 5.5V 2.2μF VIN 4.7μH GND SW 232k 10pF 4.7μF VOUT1 1.2V 400mA BUCKFB 464k 9.3mm LTC3670 DIGITAL CONTROL ENBUCK ENLDO1 ENLDO2 PGOOD LDO1 806k 1μF VOUT2 2.8V 150mA LDO1_FB 9.4mm ACTIVE AREA 324k LDO2 1.02M 1μF VOUT3 3.3V 150mA 3670 TA01b LDO2_FB 324k 3670 TA01a 3670f 1
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