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LT1172CS8#PBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24
LT1170/LT1171/LT1172
1
117012fi
For more information www.linear.com/LT1170
Typical applicaTion
FeaTures DescripTion
100kHz, 5A, 2.5A and 1.25A
High Efficiency Switching Regulators
The LT
®
1170/LT1171/LT1172 are monolithic high power-
switching regulators. They can be operated in all standard
switching configurations including buck, boost, flyback,
forward, inverting and “Cuk.” A high current, high efficiency
switch is included on the die along with all oscillator, con-
trol and protection circuitry. Integration of all functions
allows the LT1170/LT1171/LT1172 to be built in a standard
5-pin TO-3 or TO-220 power package as well as the 8-pin
packages (LT1172). This makes them extremely easy to
use and provides “bust proof” operation similar to that
obtained with 3-pin linear regulators.
The LT1170/LT1171/LT1172 operate with supply voltages
from 3V to 60V, and draw only 6mA quiescent current.
They can deliver load power up to 100W with no exter-
nal power devices. By utilizing current-mode switching
techniques, they provide excellent AC and DC load and
line regulation.
The LT1170/LT1171/LT1172 have many unique features not
found even on the vastly more difficult to use low power
control chips presently available. They use adaptive antisat
switch drive to allow very wide ranging load currents with
no loss in efficiency. An externally activated shutdown
mode reduces total supply current to 50µA typically for
standby operation.
L, LT, LTC, LTM, Linear Technology, the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
Boost Converter (5V to 12V)
applicaTions
n
Wide Input Voltage Range: 3V to 60V
n
Low Quiescent Current: 6mA
n
Internal 5A Switch
(2.5A for LT1171, 1.25A for LT1172)
n
Shutdown Mode Draws Only 50µA Supply Current
n
Very Few External Parts Required
n
Self-Protected Against Overloads
n
Operates in Nearly All Switching Topologies
n
Flyback-Regulated Mode Has Fully Floating Outputs
n
Comes in Standard 5-Pin Packages
n
LT1172 Available in 8-Pin MiniDIP and
Surface Mount Packages
n
Can Be Externally Synchronized
n
Logic Supply 5V at 10A
n
5V Logic to ±15V Op Amp Supply
n
Battery Upconverter
n
Power Inverter (+ to –) or (– to +)
n
Fully Floating Multiple Outputs
USER NOTE:
This data sheet is only intended to provide specifications, graphs, and a general functional
description of the LT1170/LT1171/LT1172. Application circuits are included to show the capability
of the LT1170/LT1171/LT1172. A complete design manual (AN19) should be obtained to assist in
developing new designs. This manual contains a comprehensive discussion of both the LT1070
and the external components used with it, as well as complete formulas for calculating the values
of these components. The manual can also be used for the LT1170/LT1171/LT1172 by factoring in
the higher frequency. A CAD design program called SwitcherCAD is also available.
Maximum Output Power*
1170/1/2 TA01
D1
MBR330
C2
1000µF
C1
1µF
R1
10.7k
1%
R2
1.24k
1%
LT1170
GND
V
IN
5V
R3
1k
*REQUIRED IF INPUT LEADS ≥ 2"
** COILTRONICS 50-2-52
PULSE ENGINEERING 92114
V
SW
FB
V
C
OUTPUT
FILTER
L2
10µH
L1**
50
µH
C3
100µF
12V
1A
C3*
100µF
+
+
INPUT VOLTAGE (V)
0
POWER (W) **
100
80
60
40
20
0
40
LT1170/1/2 TA02
10
20
30
50
* ROUGH GUIDE ONLY. BUCK MODE
P
OUT
= (5A)(V
OUT
)
SPECIAL TOPOLOGIES DELIVER
MORE POWER.
** DIVIDE VERTICAL POWER SCALE
BY TWO FOR LT1171, BY FOUR
FOR LT1172.
BOOST
BUCK-BOOST
V
O
= 30V
FLYBACK
BUCK-BOOST
V
O
= 5V
LT1170
LT1170/LT1171/LT1172
2
117012fi
For more information www.linear.com/LT1170
absoluTe MaxiMuM raTings
Supply Voltage
LT1170/LT1171/LT1172HV (Note 2) .......................60V
LT1170/LT1171/LT1172 (Note 2) ............................40V
Switch Output Voltage
LT1170/LT1171/LT1172HV ..................................... 75V
LT1170/LT1171/LT1172 .........................................65V
LT1172S8 ..............................................................60V
Feedback Pin Voltage (Transient, 1ms) ................... ±15V
Storage Temperature Range .................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec ....................300°C
(Note 1)
pin conFiguraTion
Operating Junction Temperature Range
LT1170M/LT1171M (OBSOLETE) ....... –55°C to 150°C
LT1172M (OBSOLETE) ....................... –55°C to 125°C
LT1170/LT1171/LT1172HVC,
LT1170/LT1171/LT1172C (Oper.) ............. 0°C to 100°C
LT1170/LT1171/LT1172HVC
LT1170/LT1171/LT1172C (Sh. Ckt.) ........ 0°C to 125°C
LT1170/LT1171/LT1172HVI,
LT1170/LT1171/LT1172I (Oper.) .......... –40°C to 100°C
LT1170/LT1171/LT1172HVI,
LT1170/LT1171/LT1172I (Sh. Ckt.) ...... –40°C to 125°C
1
2
3
4
8
7
6
5
TOP VIEW
GND
V
C
FB
NC*
E2
V
SW
E1
V
IN
J8 PACKAGE
8-LEAD CERDIP
T
JMAX
= 125°C, θ
JA
= 100°C/W
* Do not connect Pin 4 of the LT1172 DIP or SO to external
circuitry. This pin may be active in future revisions.
OBSOLETE
2
4
1
3
V
SW
V
C
FB
CASE
IS GND
V
IN
K PACKAGE
4-LEAD TO-3 METAL CAN
BOTTOM VIEW
LT1170MK: T
JMAX
= 150°C, θ
JC
= 2°C/W, θ
JA
= 35°C/W
LT1170CK: T
JMAX
= 100°C, θ
JC
= 2°C/W, θ
JA
= 35°C/W
LT1171MK: T
JMAX
= 150°C, θ
JC
= 4°C/W, θ
JA
= 35°C/W
LT1171CK: T
JMAX
= 100°C, θ
JC
= 4°C/W, θ
JA
= 35°C/W
LT1172MK: T
JMAX
= 150°C, θ
JC
= 8°C/W, θ
JA
= 35°C/W
LT1172CK: T
JMAX
= 100°C, θ
JC
= 8°C/W, θ
JA
= 35°C/W
Based on continuous operation.
T
JMAX
= 125°C for intermittent fault conditions.
OBSOLETE
N8 PACKAGE
8-LEAD PDIP
1
2
3
4
8
7
6
5
TOP VIEW
GND
V
C
FB
NC*
E2
V
SW
E1
V
IN
S8 PACKAGE
8-LEAD PLASTIC SO
T
JMAX
= 100°C, θ
JA
= 100°C/W (N)
T
JMAX
= 100°C, θ
JA
= 120°C/W to 150°C/W
depending on board layout (S)
* Do not connect Pin 4 of the LT1172 DIP or SO to external
circuitry. This pin may be active in future revisions.
Q PACKAGE
5-LEAD DD
V
IN
V
SW
GND
FB
V
C
FRONT VIEW
5
4
3
2
1
TAB IS
GND
T
JMAX
= 100°C, θ
JA
= *°C/W
* θ will vary from approximately 25°C/W with 2.8 sq.
in. of 1oz. copper to 45°C/W with 0.20 sq. in. of 1oz.
copper. Somewhat lower values can be obtained with
additional copper layers in multilayer boards.
TOP VIEW
SW PACKAGE
16-LEAD PLASTIC SO WIDE
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
NC
NC
GND
V
C
FB
NC
NC
NC
NC
NC
E2
V
SW
E1
V
IN
NC
NC
T
JMAX
= 100°C, θ
JA
= 150°C/W
Based on continuous operation.
T
JMAX
= 125°C for intermittent fault conditions.
T PACKAGE
5-LEAD PLASTIC TO-220
V
IN
V
SW
GND
FB
V
C
FRONT VIEW
5
4
3
2
1
TAB IS
GND
LT1170CT/LT1170HVCT: T
JMAX
=100°C, θ
JC
= 2°C/W, θ
JA
= 75°C/W
LT1171CT/LT1171HVCT: T
JMAX
=100°C, θ
JC
= 4°C/W, θ
JA
= 75°C/W
LT1172CT/LT1172HVCT: T
JMAX
=100°C, θ
JC
= 8°C/W, θ
JA
= 75°C/W
Based on continuous operation.
T
JMAX
= 125°C for intermittent fault conditions.
LT1170/LT1171/LT1172
3
117012fi
For more information www.linear.com/LT1170
orDer inForMaTion
LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LT1172MJ8 (OBSOLETE) LT1172MJ8#TR LT1172 8-Lead CERDIP –55°C to 125°C
LT1172CJ8#PBF (OBSOLETE) LT1172CJ8#TRPBF 8-Lead CERDIP 0°C to 100°C
LT1170MK#PBF (OBSOLETE) LT1170MK#TRPBF 4-Lead TO-3 Metal Can –55°C to 125°C
LT1170CK#PBF (OBSOLETE) LT1170CK#TRPBF 4-Lead TO-3 Metal Can 0°C to 100°C
LT1171MK#PBF (OBSOLETE) LT1171MK#TRPBF 4-Lead TO-3 Metal Can –55°C to 125°C
LT1171CK#PBF (OBSOLETE) LT1171CK#TRPBF 4-Lead TO-3 Metal Can 0°C to 100°C
LT1172MK#PBF (OBSOLETE) LT1172MK#TRPBF 4-Lead TO-3 Metal Can –55°C to 125°C
LT1172CK#PBF (OBSOLETE) LT1172CK#TRPBF 4-Lead TO-3 Metal Can 0°C to 100°C
LT1172CN8#PBF LT1172CN8#TRPBF LT1172 8-Lead PDIP or 8-Lead Plastic SO 0°C to 100°C
LT1172IN8#PBF LT1172IN8#TRPBF LT1172 8-Lead PDIP or 8-Lead Plastic SO –40°C to 100°C
LT1172CS8#PBF LT1172CS8#TRPBF 1172 8-Lead PDIP or 8-Lead Plastic SO 0°C to 100°C
LT1172IS8#PBF LT1172IS8#TRPBF 1172I 8-Lead PDIP or 8-Lead Plastic SO –40°C to 100°C
LT1170CQ#PBF LT1170CQ#TRPBF LT1170 5-Lead DD 0°C to 100°C
LT1170IQ#PBF LT1170IQ#TRPBF LT1170 5-Lead DD –40°C to 100°C
LT1170HVCQ#PBF LT1170HVCQ#TRPBF LT1170HV 5-Lead DD 0°C to 100°C
LT1171CQ#PBF LT1171CQ#TRPBF LT1171 5-Lead DD 0°C to 100°C
LT1171IQ#PBF LT1171IQ#TRPBF LT1171 5-Lead DD –40°C to 100°C
LT1171HVCQ#PBF LT1171HVCQ#TRPBF LT1171HV 5-Lead DD 0°C to 100°C
LT1171HVIQ#PBF LT1171HVIQ#TRPBF LT1171HV 5-Lead DD –40°C to 100°C
LT1172CQ#PBF LT1172CQ#TRPBF LT1172 5-Lead DD 0°C to 100°C
LT1172HVCQ#PBF LT1172HVCQ#TRPBF LT1172HV 5-Lead DD 0°C to 100°C
LT1172HVIQ#PBF LT1172HVIQ#TRPBF LT1172HV 5-Lead DD –40°C to 100°C
LT1172CSW#PBF LT1172CSW#TRPBF LT1172CSW 16-Lead Plastic SO Wide 0°C to 100°C
LT1170CT#PBF LT1170CQ#TRPBF LT1170 5-Lead Plastic TO-220 0°C to 100°C
LT1170IT#PBF LT1170IT#TRPBF LT1170 5-Lead Plastic TO-220 –40°C to 100°C
LT1170HVCT#PBF LT1170HVCT#TRPBF LT1170HV 5-Lead Plastic TO-220 0°C to 100°C
LT1170HVIT#PBF LT1170HVIT#TRPBF LT1170 5-Lead Plastic TO-220 –40°C to 100°C
LT1171CT#PBF LT1171CT#TRPBF LT1171 5-Lead Plastic TO-220 0°C to 100°C
LT1171IT#PBF LT1171IT#TRPBF LT1171 5-Lead Plastic TO-220 –40°C to 100°C
LT1171HVCT#PBF LT1171HVCT#TRPBF LT1171HV 5-Lead Plastic TO-220 0°C to 100°C
LT1171HVIT#PBF LT1171HVIT#TRPBF LT1171HV 5-Lead Plastic TO-220 –40°C to 100°C
LT1172CT#PBF LT1172CT#TRPBF LT1172 5-Lead Plastic TO-220 0°C to 100°C
LT1172HVCT#PBF LT1172HVCT#TRPBF LT1172HV 5-Lead Plastic TO-220 0°C to 100°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
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/. Some packages are available in 500 unit reels through
designated sales channels with #TRMPBF suffix.
http://www.linear.com/product/LT1170#orderinfo
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LT1172CS8#PBF

Mfr. #:
Buy LT1172CS8#PBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators 1.25A Pwr Sw Reg 100kHz
Lifecycle:
New from this manufacturer.
Delivery:
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