Global Mixed-mode Technology Inc.
G5207
24V Input Voltage-Mode Buck PWM Controller
Features
Drives Two N-Channel MOSFETs
Operates at 5V Supply Voltage
Voltage-Mode PWM Control
Fast Transient Response
0.8V, 2% Accuracy Reference Voltage
Internal Soft Start
Constant 300kHz Switching Frequency
Over-Current Fault Monitors by Using
Low-Side MOSFET R
DS(ON)
Output Under-Voltage Protection
General Description
The G5207 provides complete control and protection
for a DC-DC converter for high power applications. It
is designed to drive two N-channel MOSFETs in a
synchronous-rectified buck topology. The G5207 inte-
grates all of the control, and protection functions into a
single package.
The G5207 provides simple, single feedback loop,
voltage-mode control with fast transient response. It
includes a 300KHz free-running triangle-wave oscilla-
tor. The error amplifier features a 15MHz gain-band-
width product which provides high converter band-
width for fast transient performance. The resulting
PWM duty ratio ranges from 0% to 80%. The refer-
ence voltage is 0.8V, 2% accuracy.
The G5207 has internal soft start and executes cy-
cle-by-cycle current limit during soft start interval. The
G5207 monitors the current by using the R
DS(ON)
of the
low-side MOSFET which eliminates the need for a
current sensing resistor. The under-voltage protection
function monitors voltage at FB pin. The over-current
and under-voltage events after soft-start interval trig-
ger hiccup mode protection.
Applications
16V to 30V Input High Power DC-DC Regulators
Low-Voltage Distributed Power Supplies
Ordering Information
ORDER
NUMBER
G5207P11U
Note: P1: SOP-8
1: Bonding Code
U: Tape & Reel
MARKING
G5207
TEMP.
RANGE
-40°C~ +85°C
PACKAGE
(Green)
SOP-8
Pin Configuration
Typical Application Circuit
G5207
5V
16~30V
G5207
BOOT
1
8
LX
10Ω
220 F
VCC
4.7 F
BOOT
0.1 F
6 H
2000 F
620Ω
GND
39Ω
UGATE
2
7
OCSET
R
OCSET
OCSET
FB
SHDN
FB
UGATE
LX
LGATE
V
O
=13.5V
GND
3
6
10nF
LGATE
4
5
VCC
SOP-8
Ver: 1.4
Jul 18, 2011
TEL: 886-3-5788833
http://www.gmt.com.tw
1
GMT [ GLOBAL MIXED-MODE TECHNOLOGY INC ]
