G5755 Datasheet, PDF (1/1 Pages) Global Mixed-mode Technology Inc – 3A, 1.5MHz, 28V Step-down DC/DC

Global Mixed-mode Technology
G5755
3A, 1.5MHz, 28V Step-down DC/DC
Features
„ 3A Output Current
„ Wide 4.5V to 28V Operating Input Range
„ Programmable Switching Frequency from
100kHz to 1.5MHz
„ Internal Soft-Start
„ Cycle-by-Cycle Over Current Protection
„ Ceramic Capacitor Stable
„ High-Efficiency Pulse Skipping Mode for Light
Load
„ Available in DIP-8, SOP-8 (FD) and TDFN3X3-8
Package
Applications
„ High Voltage Power Conversion
„ Automotive Systems
„ Industrial Power Systems
„ Distributed Power Systems
„ Battery Powered Systems
Ordering Information
ORDER
NUMBER
MARKING
TEMP.
RANGE
PACKAGE
(Green)
G5755Z31U G5755 -40°C to +85°C
DIP-8
G5755F11U G5755 -40°C to +85°C SOP-8 (FD)
G5755RD1U 5755 -40°C to +85°C TDFN3X3-8
Note: Z3: DIP-8 F1: SOP-8 (FD) RD: TDFN3X3-8
1: Bonding Code
U : Tape & Reel
General Description
The G5755 is a monolithic step-down switch mode
regulator with a built in internal power MOSFET. It
achieves 3A continuous output current over a wide input
supply range with excellent load and line regulation.
The wide 4.5V to 28V input range accommodates a
variety of step-down applications, including those in an
automotive input environment. A 180µA operational
quiescent current allows use in battery-powered applica-
tions.
High power conversion efficiency over a wide load
range is achieved by scaling down the switching fre-
quency at light load condition to reduce the switching
and gate driving losses.
The frequency foldback helps prevent inductor current
runaway during startup and thermal shutdown provides
reliable, fault tolerant operation.
By switching at 1.5MHz, the G5755 is able to prevent
EMI (ELECTROMAGNETIC Interference) noise prob-
lems, such as those found in AM radio and ADSL ap-
plications.
The G5755 requires a minimum number of readily
available standard external components. It is available
in a DIP-8, SOP-8 (FD) and TDFN3X3-8 package.
Pin Configuration
Typical Application Circuit
LX 1
G5755
8 BS
EN 2
COMP 3
7 IN
6 FREQ
INPUT
FB 4
DIP-8
5 GND
G5755
G5755
LX 1
EN 2
COMP 3
FB 4
Thermal
Pad
8 BS
7 IN
LX 1
EN 2
6 FREQ COMP 3
5 GND
FB 4
Thermal
Pad
8 BS
7 IN
6 FREQ
5 GND
SOP-8 (FD)
TDFN3X3-8
Note: Recommend connecting the Thermal Pad to the Ground for excellent power dissipation.
C4
100nF
C1
10µF
50V
R5
100kΩ
2
7
IN
EN
8
BS
1
LX
R6
24.9kΩ
G5755
6 _FREQ
FB ⁴
R4
200kΩ
GND
5
COMP
3
C3
C6
220pF
NS
R3
68.1kΩ
L1
10µH
D1 ^R1
124kΩ
R2
40.2 kΩ
OUTPUT
3.3V
C2
22µF
6.3V
Ver: 0.8
May 27, 2013
TEL: [phone]
http://www.gmt.com.tw
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