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LTC3672B-1 Datasheet(PDF) 1 Page - Linear Technology |
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LTC3672B-1 Datasheet(HTML) 1 Page - Linear Technology |
1 / 12 page LTC3672B-1 1 3672B1f ILOAD (mA) 0 400 350 300 250 200 150 100 50 3672b1 TA01b 100 95 90 85 80 75 70 65 60 VIN = 2.9V VIN = 3.6V VIN = 5.5V TYPICAL APPLICATION FEATURES APPLICATIONS DESCRIPTION Monolithic Fixed-Output 400mA Buck Regulator with Dual 150mA LDOs in 2mm × 2mm DFN The LTC®3672B-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. 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-1. The LTC3672B-1 is available in a 2mm × 2mm × 0.75mm 8-Lead DFN package. Buck DC/DC Efficiency vs Load ■ 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 × 2mm × 0.75mm DFN Package ■ DMB Cellphones ■ Handheld Products (PDA, PMP, GPS) ■ Multivoltage Power for Digital Logic, I/O, FPGAs, CPLDs, ASICs, CPUs, and RF Chipsets L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. LTC3672B-1 GND ENALL SW VOUT1 1.8V 400mA (250mA IF LDO1 FULLY-LOADED) VOUT2 1.2V 150mA 2.2 F 4.7 H ENABLE INPUT VOUT3 2.8V UP TO 150mA (SUBJECT TO DROPOUT LIMITATIONS) BUCKOUT VIN1 VIN LDO1 LDO2 3672b1 TA01 1 F 1 F 10 F VIN 2.9V TO 5.5V |
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