GMT G5719 1mhz, 2a synchronous step-down regulator Datasheet

G5719
Global Mixed-mode Technology
1MHz, 2A Synchronous Step-Down Regulator
General Description
Features
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The G5719 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 G5719 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.
High Efficiency: Up to 95%
Low Quiescent Current: Only 50µA During Operation
Internal Soft Start Function
2A Output Current
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
Applications
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„
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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)
G5719TB1U
5719x
Adjustable
-40°C to +85°C
SOT-23-6
Note: TB: SOT-23-6
1: Bonding Code
U: Tape & Reel
Pin Configuration
Typical Application Circuit
G5719
G5719
EN
1
6
VFB
4
VIN
4~6V
LX
VIN
3
2.2µH
CFB * (option)
GND
LX
5
2
3
4
NC
CIN
2.2µF
CER
1
EN
VIN
VFB
GND
SOT-23-6
VOUT = 0.6V • (1+
R1
R2
VOUT
3.3V
2A
COUT
10µF
CER
6
R1
R2 82k
18k
)
TEL: 886-3-5788833
http://www.gmt.com.tw
Ver: 0.4
Oct 19, 2012
1
G5719A
Global Mixed-mode Technology
1MHz, 2A Synchronous Step-Down Regulator
General Description
Features
„
„
„
„
„
„
„
„
„
„
„
„
„
„
The G5719A 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 G5719A
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.
High Efficiency: Up to 95%
Low Quiescent Current: Only 50µA During Operation
Internal Soft Start Function
2A Output Current
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
Applications
„
„
„
„
„
„
„
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)
G5719ATB1U
519Ax
Adjustable
-40°C to +85°C
SOT-23-6
Note: TB: SOT-23-6
1: Bonding Code
U: Tape & Reel
Pin Configuration
Typical Application Circuit
G5719A
G5719A
EN
1
6
VFB
4
VIN
4~6V
VIN
PG
LX
GND
LX
5
2
3
4
SOT-23-6
PG
CIN
2.2µF
CER
1
EN
VIN
VOUT = 0.6V • (1+
R1
R2
)
GND VFB
5
3
R
10k
VIN
2.2µH
CFB * (option)
VOUT
3.3V
2A
COUT
10µF
CER
6
R1
R2 82k
18k
TEL: 886-3-5788833
http://www.gmt.com.tw
Ver: 0.4
Oct 22, 2012
1
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