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Linear Technology Electronic Components Datasheet

LT3570 Datasheet

1.5A Boost Converter and LDO Controller

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FEATURES
n 2.5V to 36V Input Voltage Range
n Programmable Switching Frequency
from 500kHz to 2MHz
n Synchronizable Up to 2.75MHz
n VOUT(MIN): 0.8V
n Independent Soft-Start for Each Converter
n Separate VIN Supplies for Each Converter
n Duty Cycle Range: 0% to 90% at 1MHz
n Available in 24-Lead (4mm × 4mm) QFN and
20-Lead TSSOP Packages
APPLICATIONS
n Cable and Satellite Set-Top Boxes
n Automotive Systems
n Telecom Systems
n “Dying Gasp” Systems
n TFT LCD Displays
LT3570
1.5A Buck Converter,
1.5A Boost Converter and
LDO Controller
DESCRIPTION
The LT®3570 is a buck and boost converter with internal
power switches and LDO controller. Each converter is
designed with a 1.5A current limit and an input range
from 2.5V to 36V, making the LT3570 ideal for a wide
variety of applications. Switching frequencies up to 2MHz
are programmed with an external timing resistor and the
oscillator can be synchronized to an external clock up to
2.75MHz.
The LT3570 features a programmable soft-start function
that limits the feedback voltage during start-up helping
prevent overshoot and limiting inrush current. The LDO
controller is capable of delivering up to 10mA of base
current to an external NPN transistor.
L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
TYPICAL APPLICATION
VIN
5V
VOUT1
12V
275mA
10μF
10μF
SHDN1
SHDN2
SHDN3
VIN1 VIN2 VIN3 BIAS
SHDN1
SHDN2
SHDN3
BOOST
SW2
D1 6.8μH
143k
10.0k
10nF
22k
1nF
SW1
FB1
SS1
VC1
LT3570
FB2
SS2
VC2
NPN_DRV
FB3
RT SYNC GND
15.8k
D3
100nF
3.3μH
D2
32.4k
22μF
22k
1nF
10nF 10.2k
VOUT2
3.3V
1A
Q1
22.1k
10.2k
VOUT3
2.5V
100mA
2.2μF
3570 TA01a
Efficiency
100
95
90
85
fSW = 1.2MHz
80
VIN = 5V
VOUT1 = 12V
VOUT2 = 3.3V
75 VOUT3 = 2.5V
IOUT1 = 275mA
IOUT3 = 100mA
70
0 0.2 0.4
0.6
IOUT2 (A)
0.8 1.0
3570 TA01b
3570fa
1


Linear Technology Electronic Components Datasheet

LT3570 Datasheet

1.5A Boost Converter and LDO Controller

No Preview Available !

LT3570www.DataSheet4U.com
ABSOLUTE MAXIMUM RATINGS (Note 1)
VIN1, VIN2, VIN3, VBIAS Voltage ..................................40V
BOOST Voltage .........................................................60V
BOOST Pin Above SW2.............................................25V
NPN_DRV Voltage.......................................................8V
SW1 Voltage .............................................................40V
SHDN1, SHDN2, SHDN3 Voltage ..............................40V
SYNC, RT Voltage........................................................3V
SS1, SS2 Voltage........................................................3V
FB1, FB2, FB3 Voltage...............................................10V
VC1, VC2 Voltage..........................................................3V
Maximum Junction Temperature........................... 125°C
Operating Temperature Range (Note 2).. –40°C to 125°C
Storage Temperature Range
TSSOP ............................................... –65°C to 150°C
QFN.................................................... –65°C to 125°C
Lead Temperature (Soldering, 10 sec)
TSSOP Only ...................................................... 300°C
PIN CONFIGURATION
TOP VIEW
24 23 22 21 20 19
VIN2 1
VIN2 2
SW2 3
SW1 4
GND 5
GND 6
18 VC2
17 SS2
16 GND
25
15 RT
14 SYNC
13 SHDN3
7 8 9 10 11 12
UF PACKAGE
24-LEAD (4mm s 4mm) PLASTIC QFN
TJMAX = 125°C, θJA = 37°C/W
EXPOSED PAD (PIN 25) IS GND, MUST BE SOLDERED TO PCB
TOP VIEW
FB1
SHDN1
SHDN2
SHDN3
1
2
3
4
20 VC1
19 SS1
18 VIN1
17 GND
SYNC 5
RT 6
SS2 7
VC2 8
16 SW1
21
15 SW2
14 VIN2
13 BOOST
FB2 9
FB3 10
12 VIN3
11 NPN_DRV
FE PACKAGE
20-LEAD PLASTIC TSSOP
TJMAX = 125°C, θJA = 38°C/W
EXPOSED PAD (PIN 25) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LT3570EUF#PBF
LT3570EUF#TRPBF
3570
24-Lead (4mm × 4mm) Plastic QFN –40°C to 125°C
LT3570IUF#PBF
LT3570IUF#TRPBF
3570
24-Lead (4mm × 4mm) Plastic QFN –40°C to 125°C
LT3570EFE#PBF
LT3570EFE#TRPBF
LT3570FE
20-Lead Plastic TSSOP
–40°C to 125°C
LT3570IFE#PBF
LT3570IFE#TRPBF
LT3570FE
20-Lead Plastic TSSOP
–40°C to 125°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
Consult LTC Marketing for information on non-standard lead based finish parts.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
3570fa
2


Part Number LT3570
Description 1.5A Boost Converter and LDO Controller
Maker Linear Technology
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LT3570 Datasheet PDF






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