lt3471edd-trpbf Linear Technology Corporation, lt3471edd-trpbf Datasheet

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lt3471edd-trpbf

Manufacturer Part Number
lt3471edd-trpbf
Description
Dual 1.3a, 1.2mhz Boost/inverter In 3mm ? 3mm Dfn
Manufacturer
Linear Technology Corporation
Datasheet
FEATURES
TYPICAL APPLICATIO
APPLICATIO S
CONTROL 1
CONTROL 2
1.2MHz Switching Frequency
Low V
High Output Voltage: Up to 40V
Wide Input Range: 2.4V to 16V
Inverting Capability
5V at 630mA from 3.3V Input
12V at 320mA from 5V Input
–12V at 200mA from 5V Input
Uses Tiny Surface Mount Components
Low Shutdown Current: < 1µA
Low Profile (0.75mm) 10-Lead 3mm × 3mm
DFN Package
Organic LED Power Supply
Digital Cameras
White LED Power Supply
Cellular Phones
Medical Diagnostic Equipment
Local ±5V or ±12V Supply
TFT-LCD Bias Supply
xDSL Power Supply
V
IN
CESAT
0.33µF
0.33µF
4.7k
4.7k
10µF
Switches: 330mV at 1.3A
3.3V
V
U
IN
SHDN/SS1
V
SHDN/SS2
IN
2.2µH
GND
V
IN
LT3471
SW1
10µH
OLED Driver
U
SW2
1µF
FB1N
FB2N
FB1P
FB2P
V
REF
15µH
0.1µF
105k
90.9k
3471 TA01
15k
10µF
15k
75pF
DESCRIPTIO
The LT
1.3A switches with error amplifiers that can sense to
ground providing boost and inverting capability. The low
V
current outputs in a small footprint. The LT3471 switches
at 1.2MHz, allowing the use of tiny, low cost and low
profile 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 filter.
The LT3471 switches are rated at 42V, making the device
ideal for boost converters up to ±40V as well as SEPIC and
flyback 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 config-
ured as two boosts, a boost and inverter or two inverters.
The LT3471 is available in a low profile (0.75mm) 10-lead
3mm × 3mm DFN package.
All other trademarks are the property of their respective owners.
CESAT
4.7µF
, LTC and LT are registered trademarks of Linear Technology Corporation.
®
bipolar switches enable the device to deliver high
V
7V
350mA
V
–7V
250mA
3471 dual switching regulator combines two 42V,
OUT1
OUT2
Dual 1.3A, 1.2MHz
U
3mm × 3mm DFN
Boost/Inverter in
90
85
80
75
70
65
60
55
50
95
0
OLED Driver Efficiency
100
V
V
OUT1
OUT1
I
OUT
= –7V
200
= 7V
(mA)
LT3471
300
3471 TA01b
3471fa
1
400

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lt3471edd-trpbf Summary of contents

Page 1

... SEPIC design. The device can be config- ured as two boosts, a boost and inverter or two inverters. The LT3471 is available in a low profile (0.75mm) 10-lead 3mm × 3mm DFN package. , LTC and LT are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. V OUT1 ...

Page 2

... Note 3: Current flows out of the pin. Note 4: See Typical Performance Characteristics for guaranteed current limit vs duty cycle. Note 5: V CESAT U W ORDER PART TOP VIEW NUMBER 10 SW1 9 SHDN/SS1 LT3471EDD SHDN/SS2 6 SW2 DD PART MARKING DD PACKAGE LBHM = 43°C/ W, θ = 3° ...

Page 3

W U TYPICAL PERFOR A CE CHARACTERISTICS Quiescent Current vs Temperature 2.6 2.4 2.2 2.0 1.8 1.6 –50 – 100 125 TEMPERATURE (°C) 3471 G01 SHDN/SS Current vs SHDN/SS Voltage V = 3.3V IN SHDN/SS CURRENT ...

Page 4

LT3471 CTIO S FB1N (Pin 1): Negative Feedback Pin for Switcher 1. Connect resistive divider tap here. Minimize trace area at FB1N. Set R1/R2), or connect to ground OUT FB1P ...

Page 5

U OPERATIO The LT3471 uses a constant frequency, current mode control scheme to provide excellent line and load regula- tion. Refer to the Block Diagram. At the start of each oscillator cycle, the SR latch is set, which turns on ...

Page 6

LT3471 U U APPLICATIONS INFORMATION V and R1 is between V and V REF FBP tions section for examples). In this case: ⎛ ⎞ ⎜ ⎟ OUT REF ⎝ ⎠ Select values of ...

Page 7

U U APPLICATIONS INFORMATION R SS1 CONTROL 1 4.7k 1. SS1 0.33µ 2.6V TO 4.2V Li-Ion 10µF R SS2 CONTROL 2 4.7k 1. SS2 0.33µF Supply Current of Figure 2 During Start-Up without Soft-Start ...

Page 8

LT3471 U U APPLICATIONS INFORMATION 1 ƒ π • • choosing the appropriate values for the resistor and capacitor, the zero frequency can be designed to improve the phase margin of the ...

Page 9

U U APPLICATIONS INFORMATION Semiconductor MBRM120. This is a 20V diode. Where the switch voltage exceeds 20V, use the MBRM140, a 40V diode. These diodes are rated to handle an average for- ward current of 1.0A. In applications where the ...

Page 10

LT3471 U U APPLICATIONS INFORMATION – 1.00V + REFERENCE – COMPENSATION CAPACITOR OUTPUT CAPACITOR OUT C : PHASE LEAD CAPACITOR ...

Page 11

U TYPICAL APPLICATIO SS1 CONTROL 1 4.7k 9 1.8V SHDN/SS1 0V C SS1 0.33µ 2. Li-Ion 10µF CONTROL 2 R 4.7k SS2 7 1.8V SHDN/SS2 0V C SS2 ...

Page 12

LT3471 U TYPICAL APPLICATIO S R SS1 CONTROL 1 4.7k 1. SS1 0.33µ 2.6V TO 4.2V C1 4.7µF R SS2 CONTROL 2 4.7k 1. SS2 0.33µF 12 Single Li-Ion Cell to 5V, 12V Boost ...

Page 13

U TYPICAL APPLICATIO S R SS1 CONTROL 1 4.7k 1. SS1 0.33µ 2.6V TO 4.2V C1 4.7µF R CONTROL 2 SS2 4.7k 1. SS2 0.33µF Li-Ion 20 White LED Driver L1 D1 2.2µH V ...

Page 14

LT3471 U TYPICAL APPLICATIO SS1 CONTROL 1 4. SS1 0.33µ 2.6V TO 6.5V C1 4.7µF R SS2 CONTROL 2 4. SS2 0.33µF C1, C3, C5: X5R ...

Page 15

... TOP MARK (SEE NOTE 6) Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen- tation that the interconnection of its circuits as described herein will not infringe on existing patent rights Package 10-Lead Plastic DFN (3mm × ...

Page 16

... I = 2.3V to 15V 40µA, I OUT(MAX 2.3V to 10V 34V 25µA, I OUT(MAX LT/LT 0605 REV A • PRINTED IN USA © LINEAR TECHNOLOGY CORPORATION 2004 < 1µA, < 1µA, < 1µA, SD < 35µA, < 1µA, < 1µA, < 1µA, SD < 1µA, < 1µA, 3471fa ...

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