MIC2876-4.75YMT-TR Microchip

MIC2876 4.8A I , Synchronous Boost Regulator SW with Bi-Directional Load Disconnect Features General Description Up to 95% Efficiency The MIC2876 is a compact and highly efficient 2 MHz synchronous boost regulator with a 4.8A switch. It Input Voltage Range from 2.5V to 5.5V features a bi-directional load disconnect function that Fully Integrated, High-Efficiency, 2 MHz prevents any leakage current between the input and Synchronous Boost Regulator output when the device is disabled. The MIC2876 Bi-Directional True Load Disconnect operates in bypass mode automatically when the input Integrated Anti-Ringing Switch voltage is greater than the target output voltage. At light <1 A Shutdown Current loads, the boost converter goes to the PFM mode to improve the efficiency. Bypass Mode for V V IN OUT Overcurrent Protection and Thermal Shutdown The MIC2876 also features an integrated anti-ringing switch to minimize EMI. Fixed and Adjustable Output Versions 8-pin 2 mm 2 mm UDFN package The MIC2876 is available in a 8-pin 2 mm 2 mm UDFN package, with a junction temperature range of Applications 40C to +125C. Tablets and Smartphones USB OTG and HDMI Hosts Portable Power Reserve Supplies High-Current Parallel Lithium Cell Applications Portable Equipment Package Types MIC2876 (FIXED OUTPUT) MIC2876 (ADJ. OUTPUT) 8-Pin 2x2 UDFN* (MT) 8-Pin 2x2 UDFN* (MT) (Top View) (Top View) SW 1 8 OUT SW 1 8 OUT /PG /PG PGND 2 7 PGND 2 7 EP EP 3 EN 3 EN IN 6 IN 6 AGND45 OUTS AGND45 FB * Includes Exposed Thermal Pad (EP), see Table 3-1. 2016 Microchip Technology Inc. DS20005572A-page 1MIC2876 Typical Application Schematics MIC2876 (Fixed Output) MIC2876 (Adj. Output) 2x2 UDFN 2x2 UDFN L1 L1 1H 1H 2.5V to 5.0V 2.5V to 5.0V SW SW V V V V IN OUT IN OUT IN OUT IN OUT C1 R1 5.0V C1 R1 5.0V R2 0 0 C2* 4.7F C2* 4.7F V V N EN /PG EN /PG IN IN 10V 22F 10V 22F 10V 10V OUTS FB R3 N PGND AGND PGND AGND * Two more 22 F capacitors should be added in parallel with C2 for V > 5.0V. IN Efficiency vs. Load Current Functional Block Diagrams MIC2876 (Fixed Output) MIC2876 (Adj. Output) EN IN SW EN IN SW ANTI- VIN ANTI- VIN RINGING RINGING BODY BODY DRIVER DRIVER REFERENCE REFERENCE OUT OUT GENERATOR GENERATOR HS HS DRIVER DRIVER PWM PWM LS LS LOGIC DRIVER LOGIC DRIVER CONTROL CONTROL 2MHz 2MHz OUTS OSCILLATOR OSCILLATOR PGL /PG PGH VIN /PG OC OC CURRENT CURRENT 4.8A 4.8A SENSE SENSE + + SLOPE SLOPE COMPENSATION COMPENSATION PWM PWM FB VREF VREF SOFT- SOFT- START START PGND AGND PGND AGND DS20005572A-page 2 2016 Microchip Technology Inc.