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LT3570IUF#TRPBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P20
LT3570
1
3570fb
TYPICAL APPLICATION
FEATURES
APPLICATIONS
DESCRIPTION
1.5A Buck Converter,
1.5A Boost Converter and
LDO Controller
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 2.1MHz 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.
Effi ciency
n
2.5V to 36V Input Voltage Range
n
Programmable Switching Frequency
from 500kHz to 2.1MHz
n
Synchronizable Up to 2.75MHz
n
V
OUT(MIN)
: 0.8V
n
Independent Soft-Start for Each Converter
n
Separate V
IN
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
n
Cable and Satellite Set-Top Boxes
n
Automotive Systems
n
Telecom Systems
n
“Dying Gasp” Systems
n
TFT LCD Displays
V
IN1
SHDN1
SHDN2
SHDN3
SHDN1
SHDN2
SHDN3
SW1
FB1
100nF
1nF
10nF
22µF
2.2µF
V
OUT3
2.5V
100mA
32.4k
V
OUT2
3.3V
1A
22k
143k
V
OUT1
12V
275mA
V
IN
5V
22k
10.0k
10.2k
22.1k
10.2k
3570 TA01a
15.8k
10µF
10µF
1nF
10nF
3.3µH
6.8µH
D2
D3
D1
BOOST
SW2
FB2
SS2
NPN_DRV
FB3
V
C2
SS1
V
C1
V
IN2
V
IN3
BIAS
R
T
SYNC
LT3570
GND
Q1
L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
I
OUT2
(A)
0
70
EFFICIENCY (%)
75
80
85
90
95
100
0.2 0.4 0.6 0.8
3570 TA01b
1.0
f
SW
= 1.2MHz
V
IN
= 5V
V
OUT1
= 12V
V
OUT2
= 3.3V
V
OUT3
= 2.5V
I
OUT1
= 275mA
I
OUT3
= 100mA
LT3570
2
3570fb
ABSOLUTE MAXIMUM RATINGS
V
IN1
, V
IN2
, V
IN3
, V
BIAS
Voltage ..................................40V
BOOST Voltage .........................................................60V
BOOST Pin Above SW2 .............................................25V
NPN_DRV Voltage .......................................................8V
SW1 Voltage .............................................................40V
SHDN1, SHDN2, SHDN3 Voltage ..............................40V
SYNC, R
T
Voltage ........................................................3V
SS1, SS2 Voltage ........................................................3V
FB1, FB2, FB3 Voltage ...............................................10V
(Note 1)
V
C1
, V
C2
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
24 23 22 21 20 19
7 8 9
TOP VIEW
25
UF PACKAGE
24-LEAD (4mm s 4mm) PLASTIC QFN
10 11 12
6
5
4
3
2
1
13
14
15
16
17
18V
IN2
V
IN2
SW2
SW1
GND
GND
V
C2
SS2
GND
R
T
SYNC
SHDN3
BOOST
BIAS
V
IN3
NPN_DRV
FB3
FB2
V
IN1
SS1
V
C1
FB1
SHDN1
SHDN2
T
JMAX
= 125°C, θ
JA
= 37°C/W
EXPOSED PAD (PIN 25) IS GND, MUST BE SOLDERED TO PCB
FE PACKAGE
20-LEAD PLASTIC TSSOP
1
2
3
4
5
6
7
8
9
10
TOP VIEW
20
19
18
17
16
15
14
13
12
11
FB1
SHDN1
SHDN2
SHDN3
SYNC
R
T
SS2
V
C2
FB2
FB3
V
C1
SS1
V
IN1
GND
SW1
SW2
V
IN2
BOOST
V
IN3
NPN_DRV
21
T
JMAX
= 125°C, θ
JA
= 38°C/W
EXPOSED PAD (PIN 21) IS GND, MUST BE SOLDERED TO PCB
PIN CONFIGURATION
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 specifi ed with wider operating temperature ranges. *The temperature grade is identifi ed by a label on the shipping container.
Consult LTC Marketing for information on non-standard lead based fi nish parts.
For more information on lead free part marking, go to:
http://www.linear.com/leadfree/
For more information on tape and reel specifi cations, go to:
http://www.linear.com/tapeandreel/
LT3570
3
3570fb
ELECTRICAL CHARACTERISTICS
The l denotes the specifi cations which apply over the full operating
temperature range, otherwise specifi cations are at T
A
= 25°C. V
IN1,2,3
= 12V, V
SHDN1,2,3
= 12V unless otherwise noted.
PARAMETER CONDITIONS MIN TYP MAX UNITS
Minimum Operating Voltage (V
IN1
) (Note 3)
l
2.1 2.5 V
Minimum Operating Voltage (V
IN2
) (Note 3)
l
2.1 2.5 V
Shutdown Current (Note 4) V
SHDN1,2,3
= 0V 0 1.5 µA
V
IN1
Quiescent Current V
SHDN1
= 12V, V
SHDN2,3
= 0V, V
C1
= 0.4V (Not Switching)
V
SHDN1
= 0V, V
SHDN2,3
= 12V
3.2
65
4.5
150
mA
µA
V
IN2
Quiescent Current V
SHDN1,3
= 0V, V
SHDN2
= 12V, V
C2
= 0.4V (Not Switching)
V
SHDN1,3
= 12V, V
SHDN2
= 0V
3.5
3.5
4.5
4.5
mA
mA
V
IN3
Quiescent Current V
SHDN1,2
= 0V, V
SHDN3
= 12V
V
SHDN1,2
= 12V, V
SHDN3
= 0V
700
0
950
1.5
µA
µA
Bias Quiescent Current V
BIAS
= 2.5V 2.3 3.1 mA
V
SHDN1,2,3
Pin Threshold I
VIN2
> 100µA 0.3 1.4 V
V
SHDN1,2,3
Pin UVLO
l
1.1 1.25 1.4 V
V
SHDNX
Pin Current V
SHDNX
= 12V, V
SHDNY,Z
= 0V (Note 5)
V
SHDN1,2,3
= 0V
30
0.1
50
1.5
µA
µA
Switching Frequency R
T
= 44.2k
R
T
= 7.87k
450
1900
500
2100
550
2300
kHz
kHz
Maximum Duty Cycle R
T
= 44.2k
R
T
= 7.87k
95
80
%
%
Synchronous Frequency Threshold 0.3 1.5 V
Synchronous Frequency Range 650 2750 kHz
Synchronous Frequency Minimum On/Off
Time
50 ns
FB1,2,3 Pin Voltage
l
772 788 804 mV
FB1,2,3 Pin Voltage Line Regulation V
VIN1,2,3
= 2.5V to 36V, V
C1,2
= 1V 0.01 %/V
FB1,2 Pin Bias Current V
FB1,2
= 800mV, V
C1,2
= 1V (Note 6) 30 200 nA
FB3 Pin Bias Current V
FB3
= 800mV (Note 6) 30 200 nA
SS1,2 Pin Source Current V
SS1,2
= 500mV 4.5 µA
V
C1,2
Pin Source Current V
FB1,2
= 600mV 12 µA
V
C1,2
Pin Sink Current V
FB1,2
= 1V 12 µA
SW1
Error Amplifi er 1 Transconductance 190 µMho
Error Amplifi er 1 Voltage Gain 100 V/V
V
C1
Pin Switching Threshold 750 mV
V
C1
to SW1 Current Gain 5.9 A/V
SW1 Current Limit (Note 7) 1.5 2.4 3.1 A
SW1 V
CESAT
I
SW1
= 1A (Note 7) 240 mV
SW1 Leakage Current SW1 = 40V, V
SHDN1
= 0V 0.2 5 µA
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P20

LT3570IUF#TRPBF

Mfr. #:
Buy LT3570IUF#TRPBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators 1.5A Buck Conv, 1.5A Boost Conv & LDO Cn
Lifecycle:
New from this manufacturer.
Delivery:
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