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LT3471EDD#PBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16
LT3471
1
3471fb
TYPICAL APPLICATION
DESCRIPTION
Dual 1.3A, 1.2MHz
Boost/Inverter in
3mm × 3mm DFN
FEATURES
APPLICATIONS
n
1.2MHz Switching Frequency
n
Low V
CESAT
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
–12V at 200mA from 5V Input
n
Uses Tiny Surface Mount Components
n
Low Shutdown Current: <1μA
n
Low Profi le (0.75mm) 10-Lead 3mm × 3mm
DFN Package
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
The LT
®
3471 dual switching regulator combines two 42V,
1.3A switches with error amplifi ers that can sense to
ground providing boost and inverting capability. The low
V
CESAT
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 profi 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 fi lter.
The LT3471 switches are rated at 42V, making the device
ideal for boost converters up to ±40V as well as SEPIC
and fl 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
confi gured as two boosts, a boost and inverter or two
inverters.
The LT3471 is available in a low profi le (0.75mm) 10-lead
3mm × 3mm DFN package.
4.7k
CONTROL 1
3471 TA01
0.33μF
10μF
4.7k
CONTROL 2
0.33μF
V
IN
SHDN/SS1 FB1N
SW1
SW2
LT3471
10μH
15μH
GND
FB1P
V
IN
3.3V
FB2P
FB2N
V
REF
0.1μF
4.7μF
V
OUT1
7V
350mA
V
OUT2
–7V
250mA
75pF
15k
90.9k
15k
105k
1μF
SHDN/SS2
V
IN
V
IN
10μF
2.2μH
I
OUT
(mA)
0
EFFICIENCY (%)
75
80
85
400
3471 TA01b
70
65
50
100
200
300
60
55
95
90
V
OUT1
= 7V
V
OUT1
= –7V
OLED Driver Effi ciency
OLED Driver
L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
LT3471
2
3471fb
PIN CONFIGURATION ABSOLUTE MAXIMUM RATINGS
(Note 1)
V
IN
Voltage ................................................................16V
SW1, SW2 Voltage ..................................... –0.4V to 42V
FB1N, FB1P, FB2N, FB2P Voltage......... 12V or V
IN
– 1.5V
SHDN/SS1, SHDN/SS2 Voltage ............................... 16V
V
REF
Voltage .............................................................1.5V
Maximum Junction Temperature ........................ 125°C
Operating Temperature Range (Note 2) ...–40°C to 85°C
Storage Temperature Range ...................– 65°C to 125°C
ELECTRICAL CHARACTERISTICS
PARAMETER CONDITIONS MIN TYP MAX UNITS
Minimum Operating Voltage 2.1 2.4 V
Reference Voltage
l
0.991
0.987
1.000 1.009
1.013
V
V
Reference Voltage Current Limit (Note 3) 1 1.4 mA
Reference Voltage Load Regulation 0mA ≤ I
REF
≤ 100μA (Note 3) 0.1 0.2 %/100μA
Reference Voltage Line Regulation 2.6V ≤ V
IN
≤ 16V 0.03 0.08 %/V
Error Amplifi er Offset Transition from Not Switching to Switching, V
FBP
= V
FBN
= 1V ±2 ±3 mV
FB Pin Bias Current V
FB
= 1V (Note 3)
l
60 100 nA
Quiescent Current V
SHDN
= 1.8V, Not Switching 2.5 4 mA
Quiescent Current in Shutdown V
SHDN
= 0.3V, V
IN
= 3V 0.01 1 μA
Switching Frequency 11.21.4 MHz
Maximum Duty Cycle
l
90
86
94 %
%
Minimum Duty Cycle 15 %
Switch Current Limit At Minimum Duty Cycle
At Maximum Duty Cycle (Note 4)
1.5
0.9
2.05
1.45
2.6
2.0
A
A
Switch V
CESAT
I
SW
= 0.5A (Note 5) 150 250 mV
Switch Leakage Current V
SW
= 5V 0.01 1 μA
SHDN /SS Input Voltage High 1.8 V
The ● denotes specifi cations which apply over the full operating
temperature range, otherwise specifi cations are T
A
= 25°C. V
IN
= V
SHDN
= 3V unless otherwise noted.
TOP VIEW
11
DD PACKAGE
10-LEAD
(
3mm × 3mm
)
PLASTIC DFN
10
9
6
7
8
4
5
3
2
1
SW1
SHDN/SS1
V
IN
SHDN/SS2
SW2
FB1N
FB1P
V
REF
FB2P
FB2N
T
JMAX
= 125°C, θ
JA
= 43°C/ W, θ
JC
= 3°C/W
EXPOSED PAD (PIN 11) IS GND MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE
LT3471EDD#PBF LT3471EDD#TRPBF LBHM 10-Lead (3mm × 3mm) Plastic DFN –40°C to 85°C
LEAD BASED FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE
LT3471EDD LT3471EDD#TR LBHM 10-Lead (3mm × 3mm) Plastic DFN –40°C to 85°C
Consult LTC Marketing for parts specifi ed with wider operating temperature ranges.
For more information on lead free part marking, go to:
http://www.linear.com/leadfree/
This product is only offered in trays. For more information go to:
http://www.linear.com/packaging/
LT3471
3
3471fb
ELECTRICAL CHARACTERISTICS
Quiescent Current
vs Temperature
V
REF
Voltage vs Temperature
V
REF
Voltage vs V
REF
Current
PARAMETER CONDITIONS MIN TYP MAX UNITS
SHDN Input Voltage Low Quiescent Current ≤ 1μA 0.3 V
SHDN Pin Bias Current V
SHDN
= 3V, V
IN
= 4V
V
SHDN
= 0V
22
0
36
0.1
μA
μA
The ● denotes specifi cations which apply over the full operating
temperature range, otherwise specifi cations are T
A
= 25°C. V
IN
= V
SHDN
= 3V unless otherwise noted.
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: The LT3471E is guaranteed to meet performance specifi cations
from 0°C to 70°C. Specifi cations over the –40°C to 85°C operating
temperature range are assured by design, characterization and
correlation with statistical process controls.
Note 3: Current fl ows out of the pin.
Note 4: See Typical Performance Characteristics for guaranteed current
limit vs duty cycle.
Note 5: V
CESAT
is 100% tested at wafer level only.
TYPICAL PERFORMANCE CHARACTERISTICS
TEMPERATURE (°C)
–50 –25
1.6
QUIESCENT CURRENT (mA)
2.0
2.6
0
50
75
3471 G01
1.8
2.4
2.2
25
100
125
TEMPERATURE (°C)
–50 –25
0.990
V
REF
(V)
1.000
1.010
0
50
75
3471 G02
0.995
1.005
25
100
125
V
REF
CURRENT 200μA/DIV
3471 G03
V
REF
VOLTAGE
100mV/DIV
SHDN/SS Current
vs SHDN/SS Voltage
Current Limit vs Duty Cycle
Switch Saturation Voltage
vs Switch Current
SHDN/SS VOLTAGE 1V/DIV
3471 G04
SHDN/SS
CURRENT
20μV/DIV
V
IN
= 3.3V
V
IN
> V
SHDN/SS
DUTY CYCLE (%)
0
CURRENT LIMIT (A)
1.2
1.6
2.2
2.0
80
3471 G05
0.8
0.4
1.0
1.4
1.8
0.6
0.2
0
20
40
60
100
TYPICAL
GUARANTEED
T
A
= 25°C
SW CURRENT (A)
0
V
CESAT
(mV)
800
700
600
500
400
300
200
100
0
1.6
3471 G06
0.4 0.8 1.2 2.01.40.2 0.6 1.0 1.8
90°C
25°C
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LT3471EDD#PBF

Mfr. #:
Buy LT3471EDD#PBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators 2x 1.3A, 1.2MHz Boost/Inverter in 3 3
Lifecycle:
New from this manufacturer.
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