G5201

Global Mixed-mode Technology Inc. G5201 5V/12V Input Voltage-Mode Buck PWM Controller Features „ Drives Two N-Channel MOSFETs „ Operates at 5V to 12V Supply Voltage „ Voltage-Mode PWM Control „ Fast Transient Response „ 0.8V, 2% Accuracy Reference Voltage „ Internal Soft Start „ Constant 300kHz Switching Frequency „ Over-Current Fault Monitors by Using Low-Side MOSFET RDS(ON) „ Output Under-Voltage Protection Applications „ High Power DC-DC Regulators „ Low-Voltage Distributed Power Supplies Ordering Information ORDER NUMBER G5201P11U Note: P1: SOP-8 1: Bonding Code U: Tape & Reel MARKING G5201 General Description The G5201 provides complete control and protection for a DC-DC converter for high power applications. It is designed to drive two N-channel MOSFETs in a synchronous-rectified buck topology. The G5201 integrates all of the control, and protection functions into a single package. The G5201 provides simple, single feedback loop, voltage-mode control with fast transient response. It includes a 300kHz free-running triangle-wave oscillator. The error amplifier features a 15MHz gain-bandwidth product which provides high converter bandwidth for fast transient performance. The resulting PWM duty ratio ranges from 0% to 80%. The reference voltage is 0.8V, 2% accuracy. The G5201 has internal soft start and executes cycle-by-cycle current limit during soft start interval. The G5201 monitors the current by using the RDS(ON) of the low-side MOSFET which eliminates the need ...