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Technical content

Features

„ Drives Two N-Channel MOSFETs „ Operates at 5V to 24V Supply Voltage „ Internal Bootstrap Diode Circuit „ 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

„ 16V to 30V Input High Power DC-DC Regulators „ Low-Voltage Distributed Power Supplies General Description The G5217 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 syn- chronous-rectified buck topology. The G5217 inte- grates all of the control, bootstrap diode and protection functions into a single package. The G5217 provides simple, single feedback loop, voltage-mode control with fast transient response. It includes a 300kHz free-running triangle-wave oscilla- tor. The error amplifier features a 15MHz gain-band- width product which provides high converter band- width for fast transient performance. The resulting PWM duty ratio ranges from 0% to 80%. The refer- ence voltage is 0.8V, 2% accuracy. The G5217 has internal soft start and executes cy- cle-by-cycle current limit during soft start interval. The G5217 monitors the current by using the R DS(ON) of the low-side MOSFET which eliminates the need for a current sensing resistor. The under-voltage protection function monitors voltage at FB pin. The over-current and under-voltage events after soft-start interval trig- ger hiccup mode protection.

Ordering Information

NUMBER MARKING TEMP. RANGE PACKAGE (Green) G5217P11U G 5217 -40 °C~ +85°C SOP-8 Note: P1: SOP-8 1: Bonding Code U: Tape & Reel Pin Configuration Typical Application Circuit G5217 LGATE UGATE LX GND BOOT VCC OCSET FB SOP-8 BOOT SHDN UGATE 3µH OCSET FB LGATE GND VCC 5V ~ 24V G5217 0.1µF 2000µF 10nF 10Ω 4.7µF 220µF 620Ω 39Ω ROCSET LX VO=13.5V G5217 LGATE UGATE LX GND BOOT VCC OCSET FB SOP-8 BOOT SHDN UGATE 3µH OCSET FB LGATE GND VCC 5V ~ 24V G5217 0.1µF 2000µF 10nF 10Ω 4.7µF 220µF 620Ω 39Ω ROCSET LX VO=13.5V