GMT G5601A Schematic [ru]
Global Mixed-mode Technology Inc.
G5601A
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 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
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
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.
Ordering Information
ORDER
NUMBER
G5601AR41U 5601A -40°C to +85°C TQFN3X3-16
1: Bonding Code
U : Tape & Reel
EN_S KIP
EN_S KIP
LEN
BST
LEN
BST
15
14
15
13
14
13
MARKING
TEMP.
RANGE
PACKAGE
(Green)
Ver: 1.4
Feb 11, 2010
OUT
OUT
VCC
VCC
FB
FB
PGOOD
PGOOD
1
1
2
2
3
3
4
4
G5601A TQFN3X3-16
G5601A TQFN3X3-16
5
5
LPG
LPG
17 GN D
17 GN D
Thermal
Thermal
Pad
Pad
6
6
LFB
LFB
7
7
LDRV
LDRV
1
8
8
DL
DL
12
12
11
11
10
10
DH
DH
LX
LX
IL IM
IL IM
9
9
VDD
VDD
TEL: 886-3-5788833
http://www.gmt.com.tw
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