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Linear Technology Electronic Components Datasheet

LT1070 Datasheet

5A and 2.5A High Efficiency Switching Regulators

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FEATURES
s Wide Input Voltage Range: 3V to 60V
s Low Quiescent Current: 6mA
s Internal 5A Switch (2.5A for LT1071)
s Very Few External Parts Required
s Self Protected Against Overloads
s Operates in Nearly All Switching Topologies
s Shutdown Mode Draws Only 50µA Supply Current
s Flyback Regulated Mode Has Fully Floating Outputs
s Comes in Standard 5-Pin Packages
s Can be Externally Synchronized (Consult Factory)
U
APPLICATIONS
s Logic Supply 5V at 10A
s 5V Logic to ±15V Op Amp Supply
s Off-Line Converter Up to 200W
s Battery Upconverter
s Power Inverter (+ to –) or (– to +)
s Fully Floating Multiple Outputs
s For Lower Current Applications, See the LT1072
USER NOTE:
This data sheet is only intended to provide specifications, graphs and a general functional
description of the LT1070/LT1071. Application circuits are included to show the capability of the
LT1070/LT1071. 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 LT1071 by factoring in the lower switch current
rating. A second Application Note, AN25, which details off-line applications is available.
LT1070/LT1071
5A and 2.5A High Efficiency
Switching Regulators
DESCRIPTION
The LT®1070/LT1071 are monolithic high power switch-
ing regulators. They can be operated in all standard switch-
ing configurations including buck, boost, flyback, for-
ward, 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 func-
tions allows the LT1070/LT1071 to be built in a standard
5-pin TO-3 or T0-220 power package. This makes it ex-
tremely easy to use and provides “bust proof” operation
similar to that obtained with 3-pin linear regulators.
The LT1070/LT1071 operate with supply voltages from 3V
to 60V, and draw only 6mA quiescent current. They can
deliver load power up to 100W with no external power
devices. By utilizing current mode switching techniques,
they provide excellent AC and DC load and line regulation.
The LT1070/LT1071 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 typical for standby
operation. Totally isolated and regulated outputs can be
generated by using the optional “flyback regulation mode”
built into the LT1070/LT1071, without the need for
optocouplers or extra transformer windings.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATION
Boost Converter (5V to 12V)
L2
10µH
5V L1**
150µH
OUTPUT
FILTER
C3
100µF
+
C3*
100µF
VIN VSW
LT1070
GND VC FB
D1
+
R3
1k
C1
1µF
*REQUIRED IF INPUT LEADS 2"
**PULSE ENGINEERING 92113
C2
1000µF
R1
10.7k
1%
12V
1A
R2
1.24k
1%
1070/71 TA01
Maximum Output Power*
100
80
BOOST
60
BUCK/BOOST
VO = 30V
FLYBACK
40
ISOLATED
20
BUCK/BOOST
VO = 5V
0
0 10 20 30 40 50
INPUT VOLTAGE (V)
1070/71 TA02
*ROUGH GUIDE ONLY. BUCK MODE POUT = 5A • VOUT.
SPECIAL TOPOLOGIES DELIVER MORE POWER
**DIVIDE VERTICAL POWER SCALE BY 2 FOR LT1071
1


Linear Technology Electronic Components Datasheet

LT1070 Datasheet

5A and 2.5A High Efficiency Switching Regulators

No Preview Available !

LT1070/LT1071
ABSOLUTE MAXIMUM RATINGS (Note 1)
Supply Voltage
Operating Junction Temperature Range
LT1070/LT1071 (Note 2) .................................... 40V
LT1070HV/LT1071HV (Note 2)........................... 60V
Switch Output Voltage
LT1070/LT1071 .................................................. 65V
LT1070HV/LT1071HV......................................... 75V
Feedback Pin Voltage (Transient, 1ms) ................ ±15V
Commercial (Operating) ....................... 0°C to 100°C
Commercial (Short Circuit)................... 0°C to 125°C
Industrial ......................................... – 40°C to 125°C
Military ............................................ – 55°C to 150°C
Storage Temperature Range ................ – 65°C to 150°C
Lead Temperature (Soldering, 10 sec)................. 300°C
PACKAGE/ORDER INFORMATION
BOTTOM VIEW
VSW
1
2
43
VC
CASE
IS GND
VIN FB
K PACKAGE
4-LEAD TO-3 METAL CAN
TJMAX = 100°C, θJA = 35°C/ W, QJC = 2°C (LT1070C, I)
TJMAX = 150°C, θJA = 35°C/ W, QJC = 2°C (LT1070M)
TJMAX = 100°C, θJA = 35°C/ W, QJC = 4°C (LT1071C, I)
TJMAX = 150°C, θJA = 35°C/ W, QJC = 4°C (LT1071M)
ORDER PART
NUMBER
LT1070CK
LT1070HVCK
LT1070HVMK
LT1070IK
LT1070MK
LT1071CK
LT1071HVCK
LT1071HVMK
LT1071MK
FRONT VIEW
5 VIN
4 VSW
3 GND
2 FB
1 VC
T PACKAGE
5-LEAD PLASTIC TO-220
TJMAX = 100°C, θJA = 75°C/ W, QJC = 2°C (LT1070C, I)
TJMAX = 100°C, θJA = 75°C/ W, QJC = 4°C (LT1071C)
ORDER PART
NUMBER
LT1070CT
LT1070HVCT
LT1070HVIT
LT1070IT
LT1071CT
LT1071HVCT
LT1071HVIT
LT1071IT
ELECTRICAL CHARACTERISTICS VIN = 15V, VC = 0.5V, VFB = VREF, output pin open unless otherwise specified.
SYMBOL
VREF
IB
gm
AV
IQ
PARAMETER
Reference Voltage
Feedback Input Current
Error Amplifier Transconductance
Error Amplifier Source or Sink Current
Error Amplifier Clamp Voltage
Reference Voltage Line Regulation
Error Amplifier Voltage Gain
Minimum Input Voltage
Supply Current
Control Pin Threshold
CONDITIONS
Measured at Feedback Pin, VC = 0.8V
VFB = VREF
IC = ±25µA
VC = 1.5V
Hi Clamp, VFB = 1V
Lo Clamp, VFB = 1.5V
3V VIN VMAX, VC = 0.8V
0.9V VC 1.4V
3V VIN VMAX, VC = 0.6V
Duty Cycle = 0
Normal/Flyback Threshold on Feedback Pin
MIN
1.224
q 1.214
q
3000
q 2400
150
q 120
1.80
0.25
q
500
q
0.8
q 0.6
0.4
TYP
1.244
1.244
350
4400
200
0.38
800
2.6
6
0.9
0.45
MAX
1.264
1.274
750
1100
6000
7000
350
400
2.30
0.52
0.03
3.0
9
1.08
1.25
0.54
UNITS
V
V
nA
nA
µmho
µmho
µA
µA
V
V
%/V
V/V
V
mA
V
V
V
2


Part Number LT1070
Description 5A and 2.5A High Efficiency Switching Regulators
Maker Linear Technology
Total Page 12 Pages
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