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LT1172CT#TRPBF

Description
IC IC,SMPS CONTROLLER,CURRENT-MODE,BIPOLAR,ZIP,5PIN,PLASTIC, Switching Regulator or Controller
CategoryPower/power management    The power supply circuit   
File Size231KB,24 Pages
ManufacturerLinear ( ADI )
Websitehttp://www.analog.com/cn/index.html
Environmental Compliance
Download Datasheet Parametric View All

LT1172CT#TRPBF Overview

IC IC,SMPS CONTROLLER,CURRENT-MODE,BIPOLAR,ZIP,5PIN,PLASTIC, Switching Regulator or Controller

LT1172CT#TRPBF Parametric

Parameter NameAttribute value
Is it lead-free?Lead free
Is it Rohs certified?conform to
Parts packaging codeSFM
package instructionZIP, ZIP5,.15,.2,67TB
Contacts3
Reach Compliance Codenot_compliant
ECCN codeEAR99
control modeCURRENT-MODE
Maximum input voltage60 V
Minimum input voltage3 V
Nominal input voltage15 V
JESD-30 codeR-PZFM-T5
JESD-609 codee3
Humidity sensitivity level1
Number of functions1
Number of terminals5
Maximum output current3.5 A
Package body materialPLASTIC/EPOXY
encapsulated codeZIP
Encapsulate equivalent codeZIP5,.15,.2,67TB
Package shapeRECTANGULAR
Package formFLANGE MOUNT
Peak Reflow Temperature (Celsius)225
Certification statusNot Qualified
surface mountNO
Switch configurationBUCK-BOOST
Maximum switching frequency115 kHz
technologyBIPOLAR
Terminal surfaceMatte Tin (Sn) - with Nickel (Ni) barrier
Terminal formTHROUGH-HOLE
Terminal pitch1.7 mm
Terminal locationZIG-ZAG
Maximum time at peak reflow temperatureNOT SPECIFIED
Base Number Matches1
LT1170/LT1171/LT1172
100kHz, 5A, 2.5A and 1.25A
High Efficiency Switching Regulators
FEATURES
n
n
n
n
n
n
n
n
n
n
n
DESCRIPTION
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 and SwitcherCAD are registered
trademarks of Linear Technology Corporation. All other trademarks are the property of their
respective owners.
Wide Input Voltage Range: 3V to 60V
Low Quiescent Current: 6mA
Internal 5A Switch
(2.5A for LT1171, 1.25A for LT1172)
Shutdown Mode Draws Only 50μA Supply Current
Very Few External Parts Required
Self-Protected Against Overloads
Operates in Nearly All Switching Topologies
Flyback-Regulated Mode Has Fully Floating Outputs
Comes in Standard 5-Pin Packages
LT1172 Available in 8-Pin MiniDIP and
Surface Mount Packages
Can Be Externally Synchronized
APPLICATIONS
n
n
n
n
n
Logic Supply 5V at 10A
5V Logic to ±15V Op Amp Supply
Battery Upconverter
Power Inverter (+ to –) or (– to +)
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.
TYPICAL APPLICATION
Boost Converter (5V to 12V)
5V
L1**
50μH
100
Maximum Output Power*
OUTPUT
FILTER
80
POWER (W)
**
BUCK-BOOST
V
O
= 30V
BOOST
FLYBACK
40
LT1170
*
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.
LT1170/1/2 TA02
L2
10μH
C3
100μF
V
IN
V
SW
D1
MBR330
+
+
LT1170
C3*
100μF
GND
V
C
R3
1k
C1
1μF
*REQUIRED IF INPUT LEADS
2"
FB
C2
1000μF
R1
10.7k
1%
12V
1A
60
20
R2
1.24k
1%
BUCK-BOOST
V
O
= 5V
0
0
10
30
20
INPUT VOLTAGE (V)
40
50
** COILTRONICS 50-2-52
PULSE ENGINEERING 92114
1170/1/2 TA01
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