G5212 Datasheet, PDF (1/1 Pages) Global Mixed-mode Technology Inc – Wide Input Range Synchronous Buck DCDC Voltage Mode PWM Controller

Global Mixed-mode Technology
G5212
Wide Input Range Synchronous Buck DCDC Voltage
Mode PWM Controller
Features
„ 10V to 28V Wide Input Voltage Range
„ 0.8V Internal Reference
„ Fixed 400kHz Switching Frequency
„ Internal Soft Start function
„ High DC Gain
„ Voltage Mode PWM Controller
„ Fast Transient Response
„ 0 to 80% Duty Cycle
„ Over Current Protection
„ Under Voltage Protection
„ Over Temperature Protection
„ Compact Package TSOT-23-8
„ RoHS Compliant and Halogen Free
Applications
„ Set-Top Box Power Supplies
„ PC Subsystem Power Supplies
„ Cable Modems, DSL Modems
„ DSP and Core Communication Processor
Power Supplies
„ Memory Power Supplies
„ Personal Computer Peripherals
„ Industrial Power Supplies
„ Low Voltage Distributed Power Supplies
General Description
The G5212 is a wide input range and fixed-frequency
PWM controller with integrated MOSFET drivers for
single power rail synchronous single-phase buck con-
verter. G5212 utilizes voltage-mode control with inter-
nal compensation and an internal 0.8V reference volt-
age to implement the converter design. The switching
frequency is fixed at 400kHz to reduce the external
passive component size and make the board compact.
The G5212 provides under voltage protection, current
limit, over current protection and over temperature
protection. For the over current protection function, the
low-side MOSFET R_DS(ON) is used to sense the induc-
tor current.
Ordering Information
ORDER
NUMBER
G5212Y51U
Note:Y5:TSOT-23-8
1: Bonding Code
U: Tape & Reel
Pin Configuration
MARKING
5212x
TEMP.
RANGE
-40°C to +85°C
PACKAGE
(Green)
TSOT-23-8
Typical Application Circuit
VCC 1
G5212
8 FB
LGATE 2
7 VIN
GND 3
6 PHASE
UGATE 4
5 BOOT
TSOT-23-8
C2
D
1
G5212
VCC BOOT
5
C1
UGATE ⁴
R3 C3
7 _VIN
8 _FB
PHASE ⁶
LGATE ²
GND ³
R1
R2
C_BOOT
V_IN
C4
C_IN
Q1 L
Q2
C_OUT
C5
V_OUT
Ver: 0.1
Apr 02, 2013
TEL: [phone]
http://www.gmt.com.tw
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