G5601A

G5601A
Global Mixed-mode Technology Inc.
High-Speed Step-Down Controller with LDO Controller for Notebook Computer
Features
General Description
--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
„
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 efficiency at a reduced cost by eliminating the current-sense resistor found in traditional current-mode
PWMs. Efficiency is further enhanced by an ability to
drive very large synchronous rectifier MOSFETs. Single-stage buck conversion allows these devices to
directly step down high-voltage batteries for the highest possible efficiency. Alternatively, two-stage conversion (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 indicator, under-voltage protection and soft-start are
provided for system application.
„
The G5601A is available in 16-pin TQFN (3X3) package.
--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
Ordering Information
ORDER
NUMBER
MARKING
G5601AR41U
5601A
TEMP.
RANGE
PACKAGE
(Green)
-40°C to +85°C TQFN3X3-16
Note:R4:TQFN3X3-16
1: Bonding Code
U : Tape & Reel
TON
EN_S KIP
LE N
BS T
15
14
13
8
4
DL
PGOOD
7
3
L DRV
FB
Thermal
Pad
6
2
L FB
VCC
17 GND
5
1
LP G
OUT
16
Pin Configuration
12
DH
11
LX
10
ILIM
9
VDD
G5601A TQFN3X3-16
TEL: 886-3-5788833
http://www.gmt.com.tw
Ver: 1.4
Feb 11, 2010
1