G5644

Global Mixed-mode Technology Inc. 2.5A Buck Converter G5644 Features „ 4.75V to 20V Supply Voltage Operating Range „ Fixed 500kHz Switching Frequency „ Current-Mode Buck PWM Converter „ Built-in P-Channel Power MOSFET „ 2.5A Output Current „ 0.8V Internal Reference „ Shutdown Control „ Thermal-Shutdown and Internal Soft Start „ Cycle-by-Cycle Current-Limit „ Short Circuit Protection „ Under-Voltage Lockout Protection „ SOP-8 Package Applications „ Distributed Power Systems „ Battery Charger „ Palmtop Computers, PDAs „ DSL Modems Pin Configuration General Description The G5644 is a high efficiency, 2.5A buck converter with a high-side low RDS(ON) switch. It operates from 4.75V to 20V input voltage range, and provides up to 2.5A continuous output current with the output voltage adjustable down to 0.8V. Whenever the load is light, the G5644 automatically change the PWM operation mode to PFM operation to minimize the power consumption. Hence it is suitable for battery-powered devices. It uses a fixed switching frequency up to 500kHz. When a short circuit is detected on the output, the device change switching frequency to 50kHz to protect IC from damage. The G5644 is available in a SOP-8 package. Ordering Information ORDER NUMBER MARKING G5644P11U G5644 Note: P1: SOP-8 1: Bonding Code U : Tape & Reel TEMP. RANGE -40°C to +85°C PACKAGE (Pb free) SOP-8 Typical Application Circuit IN 1 EN 2 COMP 3 FB 4 G5644 SOP-8 8 NC 7 LX 6 GND 5 NC V IN 5 V~18V CC2 opt io nal G5...