G5719B Datasheet, PDF (1/1 Pages) Global Mixed-mode Technology Inc – 1MHz, 3A Synchronous Step-Down Regulator

Global Mixed-mode Technology
G5719B
1MHz, 3A Synchronous Step-Down Regulator
Features
„ High Efficiency: Up to 95%
„ Low Quiescent Current: Only 50µA During Opera-
tion
„ Internal Soft Start Function
„ Output Current
G5719BTB1U: 2A Continuous, 3A Peak
G5719BRC1U: 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 G5719B 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 G5719B ideally suited for single
Li-Ion battery-powered applications. 100% duty cycle pro-
vides 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 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 damage
under short circuit and overvoltage conditions.
Ordering Information
ORDER
NUMBER
MARKING
OUTPUT
VOLTAGE
G5719BT11U
519Bx
Adjustable
G5719BTB1U
519Bx
Adjustable
G5719BRC1U
519B
Adjustable
Note: T1: SOT-23-5 TB: SOT-23-6 RC: TDFN2X2-8
1: Bonding Code
U: Tape & Reel
TEMP.
RANGE
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
PACKAGE
(Green)
SOT-23-5
SOT-23-6
TDFN2X2-8
Pin Configuration
Typical Application Circuit
G5719B
EN 1
5 VFB
GND 2
G5719B
LX 3
4 VIN
SOT-23-5
G5719B
EN 1
6 VFB
GND 2
5 PG
VFB 1
PG 2
VIN ₃
GND 4
Thermal
PPaadd
8 GND
7 EN
6 ^LX
5 NC
TDFN2X2-8
LX 3
4 VIN
SOT-23-6
V_IN
4~6V
C_IN
2.2µF
CER
G5719B
VIN
PG
LX
EN
GND ^VFB
R1
V_OUT = 0.6V • (1+
)
R2
R
10k
V_IN
2.2µH
C_FB* (option)
R1
R2 82k
18k
V_OUT
3.3V
2A
C_OUT
10µF
CER
Ver: 0.5
Sep 25, 2013
TEL: [phone]
http://www.gmt.com.tw
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