G5719C Datasheet, PDF (1/1 Pages) Global Mixed-mode Technology Inc – 1MHz, 3A Synchronous Step-Down Regulator

Global Mixed-mode Technology
G5719C
1MHz, 3A Synchronous Step-Down Regulator
Features
„ High Efficiency: Up to 95%
„ Low Quiescent Current: Only 50µA During Op-
eration
„ 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
„ Cellular Telephones
„ Personal Information Appliances
„ Microprocessors and DSP Core Supplies
„ Wireless and DSL Modems
„ Digital Still and Video Cameras
„ MP3 Players
„ Portable Instruments
General Description
The G5719C is a high efficiency monolithic synchro-
nous buck regulator using a constant frequency, cur-
rent mode architecture. Supply current during opera-
tion 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 applica-
tions. 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 capaci-
tors. The internal synchronous switch increase effi-
ciency and eliminates the need for an external Schot-
tky 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 dam-
age under short circuit and overvoltage conditions.
Ordering Information
ORDER
NUMBER
MARKING
G5719CTB1U
519Cx
G5719CRC1U
519C
Note: TB: SOT-23-6 RC: TDFN2X2-8
1: Bonding Code
U: Tape & Reel
Pin Configuration
OUTPUT
VOLTAGE
Adjustable
Adjustable
TEMP.
RANGE
-40°C to +85°C
-40°C to +85°C
PACKAGE
(Green)
SOT-23-6
TDFN2X2-8
Typical Application Circuit
G5719C
EN 1
6 VFB
GND 2
5 PG
LX 3
4 VIN
SOT-23-6
G5719C
VFB 1
PG 2
VIN ₃
GND 4
Thherrmall
PPaadd
8 GND
7 EN
6 ^LX
5 NC
TDFN2X2-8
V_IN
4~6V
C_IN
2.2µF
CER
G5719C
VIN
PG
LX
EN
GND ^VFB
V_OUT = 0.6V × ( 1+
R1
R2
)
R
10k
V_IN
2.2µH
C_FB* (option)
R1
R2 82k
18k
V_OUT
3.3V
2A
C_OUT
10µF
CER
Ver: 0.1
Feb 20, 2014
TEL: [phone]
http://www.gmt.com.tw
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