GMT G5755 3a, 1.5mhz, 28v step-down dc/dc Datasheet

G5755
Global Mixed-mode Technology
3A, 1.5MHz, 28V Step-down DC/DC
Features
General Description
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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.
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
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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 applications.
High power conversion efficiency over a wide load
range is achieved by scaling down the switching frequency at light load condition to reduce the switching
and gate driving losses.
Applications
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High Voltage Power Conversion
Automotive Systems
Industrial Power Systems
Distributed Power Systems
Battery Powered Systems
The frequency foldback helps prevent inductor current
runaway during startup and thermal shutdown provides
reliable, fault tolerant operation.
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)
1: Bonding Code
U : Tape & Reel
By switching at 1.5MHz, the G5755 is able to prevent
EMI (ELECTROMAGNETIC Interference) noise problems, such as those found in AM radio and ADSL applications.
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.
RD: TDFN3X3-8
Pin Configuration
Typical Application Circuit
G5755
LX
1
8
BS
EN
2
7
IN
COMP
3
6
FREQ
FB
4
5
C4
100nF
INPUT
GND
R6
24.9kΩ
R4
200kΩ
G5755
G5755
LX
1
8
BS
LX
1
8
BS
EN
2
7
IN
EN
2
7
IN
COMP
3
6
FREQ COMP
3
6
FREQ
FB
4
5
GND
FB
4
5
GND
SOP-8 (FD)
R5
100kΩ
2
DIP-8
Thermal
Pad
C1
10µF
50V
Thermal
Pad
6
7
8
BS
IN
EN
LX
D1
G5755
FREQ
L1
10µH
1
FB
4
R1
124kΩ
OUTPUT
3.3V
COMP
GND
5
3
C6
NS
C3
220pF
R3
68.1kΩ
R2
40.2 kΩ
C2
22µF
6.3V
TDFN3X3-8
Note: Recommend connecting the Thermal Pad to the Ground for excellent power dissipation.
TEL: 886-3-5788833
http://www.gmt.com.tw
Ver: 0.8
May 27, 2013
1
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