G5617A/G5617B

G5617A/G5617B
Global Mixed-mode Technology
Programmable Output High-Speed
Controller for Notebook Computer
Step-Down
Features
General Description
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G5617A/G5617B 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
G5617A/G5617B 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 G5617A/G5617B is intended
for CPU core, chipset, DRAM, or other low-voltage
supplies as low as 0.75V. It provides four resistor-programmable output voltages by G0 and G1 digital inputs.
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
Dynamic Voltage Scaling by G0 and G1 Inputs
4.5V to 24V Battery Input Range
OVP & UVP
Built-in BST Diode
1.7ms Soft-Start
Drives Large Synchronous-Rectifier FETs
Power-Good Indicator
G0/G1 High Active (G5617A)
G0/G1 Low Active (G5617B)
Applications
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Notebook Computers
CPU Core Supply
„ Chipset/RAM Supply as Low as 0.75V
„ 1.8V and 2.5V I/O Supply
„ Networking Power Supply
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The G5617A/G5617B is available in 16-pin TQFN (3X3)
package.
Ordering Information
ORDER
NUMBER
MARKING
TEMP.
RANGE
PACKAGE
(Green)
G5617AR41U
G5617BR41U
5617A
5617B
-40°C to +85°C
-40°C to +85°C
TQFN3X3-16
TQFN3X3-16
Note:R4:TQFN3X3-16
1: Bonding Code
U: Tape & Reel
TON
EN_SKIP
G1
BST
15
14
13
8
4
DL
PGOOD
7
3
G0
FB
Thermal
Pad
6
2
D0
VCC
17 GND
5
1
D1
OUT
16
Pin Configuration
12
DH
11
LX
10
ILIM
9
VDD
G5617A/G5617B TQFN3X3-16
Note: Recommend connecting the Thermal Pad to the Ground for excellent power dissipation.
TEL: 886-3-5788833
http://www.gmt.com.tw
Ver: 1.0
Nov 09, 2011
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