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Linear Technology Electronic Components Datasheet

LT1072 Datasheet

1.25A High Efficiency Switching Regulator

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LT1072
1.25A High Efficiency
Switching Regulator
FEATURES
Available in MiniDiP, TO-220, and TO-3 Packages
Wide Input Voltage Range 3V to 60V
Low Quiescent Current—6mA
Internal 1.25A Switch
Very Few External Parts Required
Self-Protected Against Overloads
Operates in Nearly All Switching Topologies
Shutdown Mode Draws Only 50µA Supply Current
Flyback-Regulated Mode has Fully Floating Outputs
Can be Externally Synchronized
U
APPLICATIO S
Logic Supply 5V at 2.5A
5V Logic to ±15V Op Amp Supply
Offline Converter up to 50W
Battery Upconverter
Power lnverter (+ to –) or (– to +)
Fully Floating Multiple Outputs
Driver for High Current Supplies
USER NOTE:
This data sheet is only intended to provide specifications, graphs, and a general functional
description of the LT1072. Application circuits are included to show the capability of the LT1072.
A complete design manual (AN-19) 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 LT1072 by factoring in the lower switch current rating.
, LTC and LT are registered trademarks of Linear Technology Corporation.
DESCRIPTIO
The LT®1072 is a monolithic high power switching
regulator. It 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, control, and
protection circuitry. Integration of all functions allows the
LT1072 to be built in a standard 5-pin TO-3 or TO-220
power package as well as the 8-pin miniDlP. This makes it
extremely easy to use and provides “bust proof” operation
similar to that obtained with 3-pin linear regulators.
The LT1072 operates with supply voltages from 3V to 60V,
and draws only 6mA quiescent current. It can deliver load
power up to 20 watts with no external power devices. By
utilizing current-mode switching techniques, it provides
excellent AC and DC load and line regulation.
The LT1072 has many unique features not found even on
the vastly more difficult to use low power control chips
presently available. It uses an adaptive anti-sat 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 typical for standby
operation. Totally isolated and regulated outputs can be
generated by using the optional “flyback regulation mode”
built into the LT1072, without the need for optocouplers or
extra transformer windings.
TYPICAL APPLICATIO
Boost Converter (5V to 12V)
5V 220µH**
VIN VSW
C3
25µF*
+
LT1072
GND VC FB
1k
+
1µF
*REQUIRED IF INPUT LEADS 2”
**PULSE ENGINEERING 52626
10.7k
12V, 0.25A
1.24k
+
470µF
LT1072 • TA01
Maximum Output Power*
25
20
15
BOOST
10
BUCK-BOOST
VO = 30V
FLYBACK
ISOLATED
5
BUCK-BOOST
VO = 5V
0
0 10 20 30 40 50
INPUT VOLTAGE (V)
*ROUGH GUIDE ONLY. BUCK MODE POUT = 1A x VOUT.
MINIDIP OUTPUT POWER MAY BE LIMITED BY PACKAGE TEMPERATURE
RISE AT HIGH INPUT VOLTAGES OR HIGH DUTY CYCLES
LT1072 • TA02
1072fc
1


Linear Technology Electronic Components Datasheet

LT1072 Datasheet

1.25A High Efficiency Switching Regulator

No Preview Available !

LT1072
ABSOLUTE AXI U RATI GS
(Note 1)
Supply Voltage
LT1072HV (See Note 1) ......................................... 60V
LT1072 (See Note 1) ............................................. 40V
Switch Output Voltage
LT1072HV ............................................................. 75V
LT1072 .................................................................. 65V
LT1072S8 .............................................................. 60V
Feedback Pin Voltage (Transient, 1ms) ................. ±15V
Operating Junction Temperature Range
LT1072HVM, LT1072M (OBSOLETE) .... –55°C to 150°C
LT1072HVC, LT1072C (Oper.)* ............0°C to 100°C
LT1072HVC, LT1072C (Sh. Ckt.)* ........0°C to 125°C
LT1072HVI ....................................... –40°C to 125°C
Storage Temperature Range ............... –65°C to 150°C
Lead Temperature (Soldering, 10 sec) ............... 300°C
*Includes LT1072S8
UW U
PACKAGE/ORDER I FOR ATIO
Note 1: Minimum switch “on” time for the LT1072 in current limit is
0.7µsec. This limits the maximum input voltage during short-circuit
conditions, in the buck and inverting modes onlyt,o 40V. Normal
(unshorted) conditions are not affected. If the LT1072 is being operated in
the buck or inverting mode at high input voltages and short-circuit
conditions are expected, a resistor must be placed in series with the
inductor, as follows:
The value of the resistor is given by:
R
=
(t)
(f) (VIN)
I(LIMIT)
Vf
– RL
t = Minimum “on” time of LT1072 in current limit, 0.7µs
f = Operating frequency (40kHz)
Vf = Forward voltage of external catch diode at I(LIMIT)
I(LIMIT) = Current limit of LT1072 (2A)
RL = Internal series resistance of inductor
BOTTOM VIEW
VSW
12
43
VC
CASE IS
GND
VIN
K PACKAGE
FB
4-LEAD TO-3 METAL CAN
TJMAX = 150°C, θJC = 8°C/W, θJA = 35°C/W
TJMAX = 100°C*, θJC = 8°C/W, θJA = 35°C/W
ORDER PART
NUMBER
LT1072HVMK
LT1072MK
LT1072HVCK
LT1072CK
TOP VIEW
GND 1
VC 2
FB 3
NC 4
8 E2
7 VSW
6 E1
5 VIN
N PACKAGE
8-LEAD PDIP
TJMAX = 100°C, θJA = 130°C/W
TOP VIEW
GND 1
VC 2
FB 3
NC 4
8 E2
7 VSW
6 E1
5 VIN
S8 PACKAGE
8-LEAD PLASTIC SO
TJMAX = 100°C, θJA = 130°C/W
OBSOLETE PACKAGE
J PACKAGE
8-LEAD CERAMIC DIP
TJMAX = 150°C, θJA = 100°C/W
OBSOLETE PACKAGE
Consider the S8 or N8 Packages for Alternate Source
FRONT VIEW
ORDER PART
NUMBER
5 VIN
4 VSW
3 GND
2 FB
1 VC
T PACKAGE
5-LEAD TO-220
TJMAX = 100°C/W, θJC = 8°C/W, θJA = 50°C/W
LT1072CT
LT1072HVCT
LT1072HVIT
TOP VIEW
NC 1
NC 2
GND 3
VC 4
FB 5
NC 6
NC 7
NC 8
16 NC
15 NC
14 E2
13 VSW
12 E1
11 VIN
10 NC
9 NC
SW PACKAGE
16-LEAD PLASTIC SO WIDE
TJMAX = 100°C, θJC = 130°C/W
Consult LTC Marketing for parts specified with wider operating temperature ranges.
2
ORDER PART
NUMBER
LT1072CN8
LT1072CS8
S8 PART
MARKING
1072
LT1072MJ8
LT1072CJ8
ORDER PART
NUMBER
LT1072CSW
LT1072 • POI01
1072fc


Part Number LT1072
Description 1.25A High Efficiency Switching Regulator
Maker Linear Technology
Total Page 16 Pages
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