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Technical content

Features

„ Ultra-High Efficiency „ Integrated 8.5mΩ at Vcc=5V N-Channel MOSFET for Low Side „ Integrated 20mΩ at Vcc=5V N-Channel MOSFET for High Side „ No Current-Sense Resistor (Lossless ILIMIT) „ Quasi-PWM with 100ns Load-Step Response „ 1% VOUT Accuracy Over Line and Load „ Programmable Switching Frequency „ Adjustable Output Range from 0.75V „ 4.5V to 28V Adapter or Battery Input Range „ Integrated Boost Switch „ OVP & UVP „ Over Temperature Protection (non-latch) „ 3.3ms Soft-Start „ Power-Good Indicator „ Fixed 5V, 20mA Linear Regulator

Applications

„ LCD Monitor/LCD TV „ Notebook Computers „ I/O Supply „ Chipset/RAM Supply as Low as 0.75V „ Networking Power Supply General Description G5309 is a 10A, synchronous DC/DC buck converter with integrated 20m Ω N-channel high-side MOSFET and 8.5mΩ N-channel low-side MOSFET. It uses con- stant on-time control scheme to handle wide in- put/output voltage ratios with ease and provides 100ns “instant-on” response to load transients while main- taining a relatively constant switching frequency. The G5309 achieves high efficiency at a reduced cost by eliminating the current-sense resistor found in tradi- tional current-mode PWMs. Single-stage buck conver- sion allows these devices to directly step down high-voltage batteries for the highest possible effi- ciency. The built-in 5V LDO supports 20mA for internal circuits. The G5309 is intended for the main power supply of LCD TV, Notebook Computer, or other low-voltage supplies as low as 0.75V. The G5309 is available in QFN4X4-28 and QFN5X5-32 package.

Ordering Information

NUMBER MARKING TEMP. RANGE PACKAGE (Green) G5309QN1U 5309 -40 °C to +85°C QFN4X4-28 G5309QA1U 5309 -40 °C to +85°C QFN5X5-32 Note: QN: QFN4X4-28 QA: QFN5X5-32 1: Bonding Code U : Tape & Reel Pin Configuration Note: Recommend connecting the Thermal Pad to the Ground for excellent power dissipation. G5309 QFN5X5-32 1ILIM AGND V5V PGND LX LX LX LX PGND PGND LX LX PGND PGND PGND PGND OUT TON FB VCC EN BST PGOOD PGND PGND PGND PGND NC G5309 QFN4X4-28 AGND V+ LX OUT TON FB VCC EN BST NC PGOOD ILIM AGND V5V PGND LX LX LX LX PGND PGND LX LX PGND PGND PGND PGND AGND V+ LX Note: Recommend connecting the Thermal Pad to the Ground for excellent power dissipation. G5309 QFN5X5-32 1ILIM AGND V5V PGND LX LX LX LX PGND PGND LX LX PGND PGND PGND PGND OUT TON FB VCC EN BST PGOOD PGND PGND PGND PGND NC G5309 QFN4X4-28 AGND V+ LX OUT TON FB VCC EN BST NC PGOOD ILIM AGND V5V PGND LX LX LX LX PGND PGND LX LX PGND PGND PGND PGND AGND V+ LX