G5719C

G5719C
Global Mixed-mode Technology
1MHz, 3A Synchronous Step-Down Regulator
General Description
Features
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The G5719C is a high efficiency monolithic synchronous buck regulator using a constant frequency, current mode architecture. Supply current during operation is only 50µA and drops to <1µA in shutdown. The
2.5V to 6V input voltage range makes the G5719C
ideally suited for single Li-Ion battery-powered applications. 100% duty cycle provides low dropout operation,
extending battery run time in portable systems.
Switching frequency is internally set at 1MHz, allowing
the use of small surface mount inductors and capacitors. The internal synchronous switch increase efficiency and eliminates the need for an external Schottky diode. Built-in soft start function eliminates in-rush
current that could damage the system. Output latch-off
operation protects the step-down regulator from damage under short circuit and overvoltage conditions.
High Efficiency: Up to 95%
Low Quiescent Current: Only 50µA During Operation
Internal Soft Start Function
Output Current
G5719CTB1U: 2A Continuous, 3A Peak
G5719CRC1U: 3A Continuous
2.5V to 6V Input Voltage Range
1MHz Switching Frequency
No Schottky Diode Required
100% Duty Cycle in Dropout Operation
0.6V Reference Allows Low Output Voltages
<1µA Shutdown Current
Current Mode Operation for Excellent Line and
Load Transient Response
Over Temperature Protected
RoHS Compliant
Power Good
Output Short Circuit Latch-off Protection
Output Overvoltage Latch-off Protection
Applications
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Cellular Telephones
Personal Information Appliances
Microprocessors and DSP Core Supplies
Wireless and DSL Modems
Digital Still and Video Cameras
MP3 Players
Portable Instruments
Ordering Information
ORDER
NUMBER
MARKING
OUTPUT
VOLTAGE
TEMP.
RANGE
PACKAGE
(Green)
G5719CTB1U
519Cx
Adjustable
-40°C to +85°C
SOT-23-6
G5719CRC1U
519C
Adjustable
-40°C to +85°C
TDFN2X2-8
Note: TB: SOT-23-6
RC: TDFN2X2-8
1: Bonding Code
U: Tape & Reel
Pin Configuration
Typical Application Circuit
R
10k
G5719C
G5719C
G5719C
EN
GND
LX
1
6
5
2
3
4
SOT-23-6
VIN
4~6V
VFB
PG
VIN
VFB
PG
8
1
2
VIN
3
GND
4
Thermal
Thermal
Pad
Pad
VIN
GND
7
EN
6
LX
5
NC
VIN
PG
2.2µH
LX
CIN
2.2µF
CER
TDFN2X2-8
VOUT = 0.6V × ( 1+
CFB * (option)
EN
R1
)
R2
GND VFB
VOUT
3.3V
2A
COUT
10µF
CER
R1
R2 82k
18k
TEL: 886-3-5788833
http://www.gmt.com.tw
Ver: 0.1
Feb 20, 2014
1