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Technical content

Features

„ Voltage Mode Asynchronous PWM Control „ 3.3V, 5V and Adjustable Output Version „ Operation Voltage can be up to 20V „ Adjustable Version Output Voltage Range, 0.8V to 16V±2% „ 300KHz Fixed Frequency Internal Oscillator „ Built-in Switching Transistor on Chip „ 3A Output Load Current „ Thermal Shutdown and Current Limit Protec- tion „ ON/OFF Shutdown Control „ Iq of Low Power Standby Mode 1µA „ Available in SOP-8 Packages

Applications

„ Simple high-efficiency step-down regulator „ On-card switching regulators „ Positive to negative converter General Description The G5503 is a voltage-mode buck PWM converter capable of driving up to 3A loads over a wide input supply range. High efficiency is obtained through the use of a low R DS(ON) P-channel power switch. The in- ternal compensation makes feedback control have excellent line and load regulation characteristics with- out external designs. It uses a fixed switching frequency of 300KHz. The output voltage is 3.3V, 5V and an user-programmable version via an external resistive voltage divider. The built-in soft-start can reduce inrush current on the input source at turn on. The device also has built-in current-limit, thermal shutdown, under-voltage lockout and an ON/OFF logic-control that can power down the regulator to a shutdown mode. When current limit function occurred and V FB is down to 0.3V below, the device changes switching frequency to 120KHz to protect IC from damage. G5503 is available in SOP-8 package.

Ordering Information

NUMBER MARKING VOLTAGE TEMP. RANGE PACKAGE (Pb free) G5503-ADJP11U 5503A Adjustable -40 °C~85°C SOP-8 G5503-33P11U 5503B 3.3V -40 °C~85°C SOP-8 G5503-50P11U 5503C 5.0V -40 °C~85°C SOP-8 Note: P1: SOP-8 1: Bonding Code U: Tape & Reel Pin Configuration Typical Application Circuit NC FB EN IN NC GND LX NC SOP-8 G5503 VOUT = 0.8 x ( 1 + ) EN FB LX GND VIN 6V~18V D1 SCD36 33µH R1/31.25K R2/10K IN 220µF VOUT 3.3V/2A 470µF G5503 1µF 1µF* * optional NC FB EN IN NC GND LX NC SOP-8 G5503 VOUT = 0.8 x ( 1 + ) EN FB LX GND VIN 6V~18V D1 SCD36 33µH R1/31.25K R2/10K IN 220µF VOUT 3.3V/2A 470µF G5503 1µF 1µF* * optional