GMT G5699 Dual 1.4mhz, 1a synchronous step-down regulator Datasheet

G5699
Global Mixed-mode Technology Inc.
Dual 1.4MHz, 1A Synchronous Step-Down Regulator
General Description
Features
„
„
„
„
„
„
„
„
„
„
„
„
The G5699 is a dual channel 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 for each channel. The 2.7V to 5.5V input
voltage range makes the G5699 ideally suited for single Li-Ion battery-powered applications. Both regulators have independent input and enable pins. 100%
duty cycle provides low dropout operation, extending
battery run time in portable systems. Switching frequency is internally set at 1.4MHz, 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. The G5699 is available
in TDFN3X3-12 package.
High Efficiency: Up to 95%
Internal Soft Start Function
Output Current
Channel 1: 1A
Channel 2: 1A
2.7V to 5.5V Input Voltage Range
1.4MHz 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
„
„
„
„
„
„
„
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
G5699RQ1U
5699
Note: RQ: TDFN3X3-12
1: Bonding Code
U: Tape & Reel
Pin Configuration
TEMP.
RANGE
PACKAGE
(Green)
-40°C~ +85°C
TDFN3X3-12
MARKING
Typical Application Circuit
G5699
VIN1
VIN2
1
LX2
2
GND
3
G5699
G5625
Thermal
Pad
12
EN2
11
NC2
10
FB2
FB1
4
9
GND
NC1
5
8
LX1
EN1
6
7
VIN1
CIN1
4.7µF
CER
VIN1
EN1
2.2µH
VOUT1
LX1
FB1
CFB1*
(option)
R1
COUT1
4.7µF
CER
R2
VIN2
CIN2
4.7µF
CER
TDFN3X3-12
2.2µH
VIN2
LX2
EN2
FB2
CFB2*
(option)
VOUT2
R3
COUT2
4.7µF
CER
R4
Note: Recommend connecting the Thermal Pad to
the Ground for excellent power dissipation.
VOUT1 = 0.6V • (1+
VOUT2 = 0.6V • (1+
R1
R2
R3
R4
)
)
* Refer to Table. 1 for Component Selection
TEL: 886-3-5788833
http://www.gmt.com.tw
Ver: 0.5
Jul 23, 2009
1
Similar pages