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Technical content

Features

--PWM Controller „ Ultra-High Efficiency „ No Current-Sense Resistor (Lossless ILIMIT) „ Quasi-PWM with 100ns Load-Step Response „ 1% VOUT Accuracy Over Line and Load „ 0.75V to 3.6V Adjustable Output Range „ 4.5V to 24V Battery Input Range „ OVP & UVP „ 1.7ms Soft-Start „ Drives Large Synchronous-Rectifier FETs „ Power-Good Indicator --LDO Controller „ 1.5% Accuracy Over Line and Load „ Adjustable Output down to 0.75V „ Independent Enable and Power Good Indicator „ Drives N-channel MOSFET within Rail to Rail Controller Voltage „ MLCC and POSCAP Stable

Applications

„ Notebook Computers „ CPU Core Supply „ Chipset/RAM Supply as Low as 0.75V „ 1.8V and 2.5V I/O Supply „ Networking Power Supply General Description G5601A PWM controller uses constant on-time control scheme to handle wide input/output voltage ratios with ease and provides 100ns “instant-on” response to load transients while maintaining a relatively constant switching frequency. The G5601A achieves high effi- ciency at a reduced cost by eliminating the cur- rent-sense resistor found in traditional current-mode PWMs. Efficiency is further enhanced by an ability to drive very large synchronous rectifier MOSFETs. Sin- gle-stage buck conversion allows these devices to directly step down high-voltage batteries for the high- est possible efficiency. Alternatively, two-stage con- version (stepping down the +5V system supply instead of the battery) at a higher switching frequency allows the minimum possible physical size. The G5601A is intended for CPU core, chipset, DRAM, or other low-voltage supplies as low as 0.75V. G5601A LDO controller can drive an external NMOSFET to provide a second output voltage from PWM output or other power source. It is adjusted output from 0.75V. The independent enable input, open-drain power good in- dicator, under-voltage protection and soft-start are provided for system application. The G5601A is available in 16-pin TQFN (3X3) package.

Ordering Information

NUMBER MARKING TEMP. RANGE PACKAGE (Green) G5601AR41U 5601A -40 °C to +85°C TQFN3X3-16 N o t e : R 4 : T Q F N 3 X 3 - 1 6 1: Bonding Code U : Tape & Reel Pin Configuration G5601A TQFN3X3-16 LDRV DH LX IL IM VDD 13DL LPG LFB Thermal Pad LEN BST EN_SKIP TON OUT VCC FB PGOOD

17 GND

EN_SKIP TON OUT VCC FB PGOOD