G5318 Datasheet, PDF (1/1 Pages) Global Mixed-mode Technology Inc – High-Speed Step-Down Controller

Global Mixed-mode Technology
G5318
High-Speed Step-Down Controller
Features
„ Ultra-High Efficiency
„ 4700ppm/°C R_DS(ON) Current Sensing ( without
Current-Sense Resistor )
„ Quasi-PWM with 100ns Load-Step Response
„ Built-in 0.5% 0.7V Reference
„ 0.7V to 2.6V Adjustable Output Range
„ 4.5V to 28V Battery Input Range
„ 4 Selectable Frequency Setting
„ Integrated Boost Switch
„ OVP & UVP
„ 1.5ms Voltage Servo Soft-Start
„ Drives Large Synchronous-Rectifier FETs
„ Power-Good Indicator
„ Thermal Shutdown (Non-latch)
General Description
G5318 is a small-sized step-down controller uses con-
stant on-time control scheme to handle wide in-
put/output voltage ratios with ease and provides 100ns
“instant-on” response to load transients while main-
taining a relatively constant switching frequency. The
G5318 achieves high efficiency at a reduced cost by
eliminating the current-sense resistor found in tradi-
tional current-mode PWMs. Efficiency is further en-
hanced by an ability to drive very large synchronous
rectifier MOSFETs. The G5318 is intended for CPU
core, chipset, DRAM, or other low-voltage supplies as
low as 0.7V. The G5318 is available in TDFN3X3-10
package.
Applications
„ Notebook Computers
„ CPU Core Supply
„ I/O Supply
„ Chipset/RAM Supply as Low as 0.7V
Ordering Information
ORDER
NUMBER
G5318RE1U
G5318RE1D
Note: RE: TDFN3X3-10
1: Bonding Code
U & D : Tape & Reel
Pin Configuration
MARKING
5318
5318
TEMP.
RANGE
-40°C to +85°C
-40°C to +85°C
PGOOD 1
TRIP 2
EN 3
FB 4
RF 5
G5318
11 GND
Thermal
Pad
10 BST
9 DH
8 LX
7 VCC
6 DL
TDFN3X3-10
PACKAGE
(Green)
TDFN3X3-10
TDFN3X3-10
Ver: 0.8
Apr 15, 2013
TEL: [phone]
http://www.gmt.com.tw
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