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LT3471 Datasheet, PDF (1/16 Pages) Linear Technology – Dual 1.3A, 1.2MHz Boost/Inverter in 3mm x 3mm DFN | |||
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FEATURES
n 1.2MHz Switching Frequency
n Low VCESAT Switches: 330mV at 1.3A
n High Output Voltage: Up to 40V
n Wide Input Range: 2.4V to 16V
n Inverting Capability
n 5V at 630mA from 3.3V Input
n 12V at 320mA from 5V Input
n â12V at 200mA from 5V Input
n Uses Tiny Surface Mount Components
n Low Shutdown Current: < 1μA
n Low Proï¬le (0.75mm) 10-Lead 3mm à 3mm
DFN Package
APPLICATIONS
n Organic LED Power Supply
n Digital Cameras
n White LED Power Supply
n Cellular Phones
n Medical Diagnostic Equipment
n Local ±5V or ±12V Supply
n TFT-LCD Bias Supply
n xDSL Power Supply
LT3471
Dual 1.3A, 1.2MHz
Boost/Inverter in
3mm à 3mm DFN
DESCRIPTION
The LT®3471 dual switching regulator combines two 42V,
1.3A switches with error ampliï¬ers that can sense to
ground providing boost and inverting capability. The low
VCESAT bipolar switches enable the device to deliver high
current outputs in a small footprint. The LT3471 switches
at 1.2MHz, allowing the use of tiny, low cost and low proï¬le
inductors and capacitors. High inrush current at start-up
is eliminated using the programmable soft-start function,
where an external RC sets the current ramp rate. A constant
frequency current mode PWM architecture results in low,
predictable output noise that is easy to ï¬lter.
The LT3471 switches are rated at 42V, making the device
ideal for boost converters up to ±40V as well as SEPIC
and ï¬yback designs. Each channel can generate 5V at
up to 630mA from a 3.3V supply, or 5V at 510mA from
four alkaline cells in a SEPIC design. The device can be
conï¬gured as two boosts, a boost and inverter or two
inverters.
The LT3471 is available in a low proï¬le (0.75mm) 10-lead
3mm à 3mm DFN package.
L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
TYPICAL APPLICATION
CONTROL 1 4.7k
0.33μF
VIN
CONTROL 2
10μF
4.7k
0.33μF
OLED Driver
2.2μH
VIN
3.3V
SW1
SHDN/SS1
VIN
LT3471
FB1N
FB1P
VREF
SHDN/SS2
GND
VIN
FB2N
FB2P
SW2
3471 TA01
10μH 1μF
90.9k
15k
0.1μF
15k
4.7μF
VOUT1
7V
350mA
105k
75pF
15μH
10μF
VOUT2
â7V
250mA
OLED Driver Efï¬ciency
95
90
VOUT1 = 7V
85
80
VOUT1 = â7V
75
70
65
60
55
50
0
100
200
300
400
IOUT (mA)
3471 TA01b
3471fb
1
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