MIC2875-AYMT-T5 Microchip

MIC2875 4.8A I , Synchronous Boost Regulator SW with Bi-Directional Load Disconnect Features General Description Up to 95% Efficiency The MIC2875 is a compact and highly-efficient 2 MHz synchronous boost regulator with a 4.8A switch. It Input Voltage Range: 2.5V to 5.5V features a bi-directional load disconnect function which Fully-Integrated, High-Efficiency, 2 MHz prevents any leakage current between the input and Synchronous Boost Regulator output when the device is disabled. The MIC2875 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 Minimum Switching Frequency of 45 kHz loads, the boost converter goes to the PFM mode to improve the efficiency. <1 A Shutdown Current Bypass Mode for V V To minimize switching artifacts in the audio band, the IN OUT MIC2875 is designed to operate with a minimum Overcurrent Protection and Thermal Shutdown switching frequency of 45 kHz. The MIC2875 also Fixed and Adjustable Output Versions features an integrated anti-ringing switch to minimize 8-pin 2 mm 2 mm TDFN Package EMI. Applications The MIC2875 is available in a 8-pin 2 mm 2 mm Thin Tablet and Smartphones DFN (TDFN) package, with a junction temperature range of 40C to +125C. USB OTG and HDMI Hosts Portable Power Reserve Supplies Low-Noise Audio Applications Portable Equipment Package Type MIC2875 (FIXED OUTPUT) MIC2875 (ADJ. OUTPUT) 8-Pin 2x2 TDFN* (MT) 8-Pin 2x2 TDFN* (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. 2015 Microchip Technology Inc. DS20005549A-page 1MIC2875 Typical Application Schematics MIC2875 (Fixed Output) MIC2875 (Adjustable Output) L1 1H L1 1H 2.5V to 5.0V 2.5V to 5.0V SW SW V V V V IN OUT IN IN OUT OUT IN OUT 5.0V 5.0V R1 R1 C1 C1 1M 1M 4.7F C2* 4.7F C2* R2 V EN /PG V EN /PG IN IN 10V 22F 10V 22F 910k 10V 10V OUTS FB R3 200k PGND AGND PGND AGND * Two more 22F capacitors should be added in parallel with C2 for V > 5.0V. IN Efficiency vs. Load Current 100 90 V = 3.6V IN 80 V = 3.0V IN V = 2.5V IN 70 60 V =5.0V OUT L = 1H C = 22F OUT 50 0.001 0.010 0.100 1.000 LOAD CURRENT (A) Functional Block Diagrams MIC2875 (Fixed Output) MIC2875 (Adj. Output) EN IN SW EN IN SW ANTI- VIN ANTI- VIN RINGING RINGING BODY BODY DRIVER DRIVER REFERENCE REFERENCE OUT GENERATOR OUT GENERATOR HS HS DRIVER PWM LOGIC DRIVER PWM LOGIC CONTROL LS CONTROL LS + DRIVER + DRIVER MINIMUM 2MHz MINIMUM 2MHz SWITCHING OSCILLATOR OUTS SWITCHING OSCILLATOR PGL /PG VIN PGH /PG OC OC CURRENT CURRENT 4.8A 4.8A SENSE SENSE + + SLOPE SLOPE COMPENSATION PWM COMPENSATION PWM FB VREF SOFT- VREF SOFT- START START PGND AGND PGND AGND DS20005549A-page 2 2015 Microchip Technology Inc. EFFICIENCY (%)