G5207
Global Mixed-mode Technology Inc.
24V Input Voltage-Mode Buck PWM Controller
Features
General Description
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 RDS(ON)
Output Under-Voltage Protection
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 integrates 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 oscillator. The error amplifier features a 15MHz gain-bandwidth product which provides high converter bandwidth for fast transient performance. The resulting
PWM duty ratio ranges from 0% to 80%. The reference voltage is 0.8V, 2% accuracy.
Applications
16V to 30V Input High Power DC-DC Regulators
Low-Voltage Distributed Power Supplies
The G5207 has internal soft start and executes cycle-by-cycle current limit during soft start interval. The
G5207 monitors the current by using the RDS(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 trigger hiccup mode protection.
Ordering Information
ORDER
NUMBER
G5207P11U
Note: P1: SOP-8
1: Bonding Code
U: Tape & Reel
MARKING
TEMP.
RANGE
PACKAGE
(Green)
G5207
-40°C~ +85°C
SOP-8
Pin Configuration
Typical Application Circuit
5V
G5207
16~30V
G5207
BOOT
1
10Ω
8
220µF
LX
VCC
BOOT
4.7µF
UGATE
2
7
OCSET
ROCSET
OCSET
GND
6
3
FB
SHDN
LGATE
4
5
VCC
FB
UGATE
0.1µF
6µH
VO=13.5V
LX
LGATE
2000µF
620Ω
10nF
GND
SOP-8
39Ω
TEL: 886-3-5788833
http://www.gmt.com.tw
Ver: 1.4
Jul 18, 2011
1