GMT G5601 Schematic [ru]
Global Mixed-mode Technology Inc.
G5601
High-Speed Step-Down Controller with LDO Controller for Notebook Computer
Features
--PWM Controller
Ultra-High Efficiency
No Current-Sense Resistor (Lossless I
Quasi-PWM with 100ns Load-Step Response
1% VOUT Accuracy Over Line and Load
0.75V to 5.5V Adjustable Output Range
4.5V to 24V Battery Input Range
OVP & UVP
1.7ms Digital Soft-Start
Drives Large Synchronous-Rectifier FETs
Power-Good Indicator
LIMIT
)
--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
Note: R4:TQFN3X3-16
Pin Configuration
TON
TON
16
16
General Description
G5601 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 G5601 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 G5601 is
intended for CPU core, chipset, DRAM, or other
low-voltage supplies as low as 0.75V. G5601 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 G5601 is available in 16-pin TQFN (3X3) package.
Ordering Information
ORDER
NUMBER
G5601R41U 5601 0°C to +85°C TQFN3X3-16
1: Bonding Code
U : Tape & Reel
EN_SKIP
EN_SKIP
15
15
BST
BST
LEN
LEN
13
13
14
14
MARKIMG
TEMP.
RANGE
PACKAGE
(Pb free)
Ver: 0.2
Aug 01, 2008
OUT
OUT
VCC
VCC
FB
FB
PGOOD
PGOOD
1
1
2
2
3
3
4
4
17 GND
17 GND
Thermal
Thermal
Pad
Pad
5
5
6
6
LFB
LFB
LPG
LPG
G5601 TQFN3X3-16
G5601 TQFN3X3-16
1
7
7
LDRV
LDRV
8
8
DL
DL
DH
DH
12
12
LX
LX
11
11
10
10
ILIM
ILIM
9
9
VDD
VDD
TEL: 886-3-5788833
http://www.gmt.com.tw
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