G5603

G5603
Global Mixed-mode Technology Inc.
High-Speed Step-Down Controller
Features
General Description
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G5603 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 G5603 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 G5603 is intended for CPU
core, chipset, DRAM, or other low-voltage supplies as
low as 0.75V. The G5603 is available in TSSOP-14 、
TQFN3X3-16 and TQFN3.5X3.5-14 package and includes over voltage protection.
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
Integrated Boost Diode
OVP & UVP
1.7ms Soft-Start
Drives Large Synchronous-Rectifier FETs
Power-Good Indicator
Applications
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Notebook Computers
CPU Core Supply
„ I/O Supply
„ Chipset/RAM Supply as Low as 0.75V
„ Networking Power Supply
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Ordering Information
TEMP.
RANGE
PACKAGE
(Green)
ORDER
NUMBER
MARKING
G5603D21U
G5603
-40°C to +85°C
TSSOP-14
G5603R41U
G5603RU1U
5603
5603
-40°C to +85°C
-40°C to +85°C
TQFN3X3-16
TQFN3.5x3.5-14
Note: D2: TSSOP-14
RU: TQFN3.5x3.5-14
1: Bonding Code
U : Tape & Reel
R4: TQFN3X3-16
VDD
PGOOD
4
PGOOD
6
9
DL
AGND
7
8
PGND
TSSOP-14
9
VDD
5
6
7
8
NC
AGND
PGND
DL
EN_SKIP
G5603 TQFN3X3-16
DL
VDD
10
9
5
ILIM
1
6
FB
10
8
PGND
7
AGND
Thermal
Pad
PGOOD
3
ILIM
FB
10
ILIM
14
5
11
BST
11 LX
Thermal
Pad
FB
4
LX
VCC
11
2
4
VCC
DH
VCC
LX
DH
12
13
3
12
OUT
12
2
1
3
OUT
TON
DH
OUT
13
BST
2
13
TON
NC
BST
14
14
EN_SKIP
1
15
EN_SKIP
TON
G5603
16
Pin Configuration
G5603 TQFN3.5X3.5-14
Note: Recommend connecting the Thermal Pad to the Ground for excellent power dissipation.
TEL: 886-3-5788833
http://www.gmt.com.tw
Ver: 0.92
Mar 25, 2011
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