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LTC3672B-2 Datasheet(PDF) 1 Page - Linear Technology |
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LTC3672B-2 Datasheet(HTML) 1 Page - Linear Technology |
1 / 12 page LTC3672B-2 1 3672b2fa n Triple Output Supply From a Single 2.9V to 5.5V Input n Buck DC/DC: Fixed 1.2V Output, Up to 400mA n LDO1: Fixed 2.8V Output, Up to 150mA n LDO2: Fixed 1.8V Output, Up to 150mA n ±2.5% Reference Accuracy n Constant-Frequency 2.25MHz Operation n Minimum External Component Count n Current Mode Operation for Excellent Line and Load Transient Response n Internal Soft-Start for Each Output n Single Enable Pin Turns On/Shuts Down All Three Outputs n Tiny 2mm × 2mm × 0.75mm DFN Package ILOAD (mA) 0 80 90 400 70 60 100 200 300 50 150 250 350 100 75 85 65 95 3672B2 TA01b VIN = 2.9V VIN = 5.5V VIN = 3.6V TYPICAL APPLICATION FEATURES APPLICATIONS DESCRIPTION Monolithic Fixed-Output 400mA Buck Regulator with Dual 150mA LDOs in 2mm × 2mm DFN 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 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-2 regulates 1.2V at the buck output, 2.8V at the LDO1 output, and 1.8V at the LDO2 output. Exter- nal 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-2. The LTC3672B-2 is available in a 2mm × 2mm × 0.75mm 8-Lead DFN package. Buck DC/DC Efficiency vs Buck Load n DMB and DVB-H Cellphones n Handheld Products (PDA, PMP, GPS) n Multivoltage Power for Digital Logic, I/O, FPGAs, CPLDs, ASICs, CPUs, and RF Chipsets LTC3672B-2 GND ENALL SW VOUT2 2.8V, UP TO 150mA (SUBJECT TO DROPOUT LIMITATIONS) VOUT1 1.2V 400mA VIN 2.9V TO 5.5V VOUT3 1.8V 150mA ENABLE INPUT BUCKOUT VIN VIN1 LDO1 LDO2 3672B2 TA01 1μF 1μF 4.7μF 4.7μH 2.2μF , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. |
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