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Linear Technology Electronic Components Datasheet

LT1076 Datasheet

Step-Down Switching Regulator

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LT1074/LT1076
Step-Down Switching
Regulator
FEATURES
5A Onboard Switch (LT1074)
Operates Up to 60V Input
100kHz Switching Frequency
Greatly Improved Dynamic Behavior
Available in Low Cost 5 and 7-Lead Packages
Only 8.5mA Quiescent Current
Programmable Current Limit
Micropower Shutdown Mode
U
APPLICATIO S
Buck Converter with Output Voltage Range of 2.5V
to 50V
Tapped-Inductor Buck Converter with 10A Output
at 5V
Positive-to-Negative Converter
Negative Boost Converter
Multiple Output Buck Converter
DESCRIPTIO
The LT®1074 is a 5A (LT1076 is rated at 2A) monolithic
bipolar switching regulator which requires only a few
external parts for normal operation. The power switch, all
oscillator and control circuitry, and all current limit com-
ponents, are included on the chip. The topology is a classic
positive “buck” configuration but several design innova-
tions allow this device to be used as a positive-to-negative
converter, a negative boost converter, and as a flyback
converter. The switch output is specified to swing 40V
below ground, allowing the LT1074 to drive a tapped-
inductor in the buck mode with output currents up to 10A.
The LT1074 uses a true analog multiplier in the feedback
loop. This makes the device respond nearly instanta-
neously to input voltage fluctuations and makes loop gain
independent of input voltage. As a result, dynamic behav-
ior of the regulator is significantly improved over previous
designs.
On-chip pulse by pulse current limiting makes the LT1074
nearly bust-proof for output overloads or shorts. The input
voltage range as a buck converter is 8V to 60V, but a self-
boot feature allows input voltages as low as 5V in the
inverting and boost configurations.
The LT1074 is available in low cost TO-220 or DD packages
with frequency pre-set at 100kHz and current limit at 6.5A
(LT1076 = 2.6A). A 7-pin TO-220 package is also available
which allows current limit to be adjusted down to zero. In
addition, full micropower shutdown can be programmed.
See Application Note 44 for design details.
A fixed 5V output, 2A version is also available. See LT1076-5.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATIO
10V TO 40V
+
Basic Positive Buck Converter
L1**
50µH (LT1074)
100µH (LT1076)
VIN VSW
LT1074
GND
C3
200µF
FB
VC
R3
2.7k
C2
0.01µF
MBR745*
R1
2.8k
1%
R2
2.21k
1% +
5V
5A * USE MBR340 FOR LT1076
** COILTRONICS #50-2-52 (LT1074)
#100-1-52 (LT1076)
PULSE ENGINEERING, INC.
#PE-92114 (LT1074)
#PE-92102 (LT1076)
HURRICANE #HL-AK147QQ (LT1074)
#HL-AG210LL (LT1076)
C1 RIPPLE CURRENT RATING IOUT/2
500µF
25V
LT1074•TA01
Buck Converter Efficiency
100
90
80
70
60
50
0
LT1074
VOUT = 12V, VIN = 20V
VOUT = 5V, V IN = 15V
L = 50µH TYPE 52 CORE
DIODE = MBR735
1 234 5 6
OUTPUT LOAD CURRENT (A)
LT1074•TPC27
sn1074 1074fds
1


Linear Technology Electronic Components Datasheet

LT1076 Datasheet

Step-Down Switching Regulator

No Preview Available !

LT1074/LT1076
ABSOLUTE AXI U RATI GS (Note 1)
Input Voltage
LT1074/ LT1076 .................................................. 45V
LT1074HV/LT1076HV ......................................... 64V
Switch Voltage with Respect to Input Voltage
LT1074/ LT1076 .................................................. 64V
LT1074HV/LT1076HV ......................................... 75V
Switch Voltage with Respect to Ground Pin (VSW Negative)
LT1074/LT1076 (Note 7) ..................................... 35V
LT1074HV/LT1076HV (Note 7) ........................... 45V
Feedback Pin Voltage ..................................... –2V, +10V
Shutdown Pin Voltage (Not to Exceed VIN) .............. 40V
ILIM Pin Voltage (Forced) ............................................ 5.5V
Maximum Operating Ambient Temperature Range
Commercial ................................................. 0°C to 70°C
Industrial ................................................ –40°C to 85°C
Military (OBSOLETE) ..................... –55°C to 125°C
Maximum Operating Junction Temperature Range
Commercial ............................................... 0°C to 125°C
Industrial .............................................. –40°C to 125°C
Military (OBSOLETE) .................... – 55°C to 150°C
Maximum Storage Temperature ............... –65°C to 150°C
Lead Temperature (Soldering, 10 sec) ...................... 300°C
UW U
PACKAGE/ORDER I FOR ATIO
TAB IS
GND
FRONT VIEW
5
4
3
2
1
Q PACKAGE
5-LEAD PLASTIC DD
VIN
VSW
GND
VC
FB/SENSE
LT1076: θJC = 4°C, θJA = 30°C/W
ORDER PART
NUMBER
LT1076CQ
LT1076IQ
TAB IS
GND
FRONT VIEW
7
6
5
4
3
2
1
R PACKAGE
7-LEAD PLASTIC DD
SHDN
VC
FB/SENSE
GND
ILIM
VSW
VIN
LT1076: θJC = 4°C, θJA = 30°C/W
LT1076CR
LT1076IR
LT1076HVCR
LT1076HVIR
TAB IS
GND
FRONT VIEW
7
6
5
4
3
2
1
T7 PACKAGE
7-LEAD PLASTIC TO-220
LT1074CT7
LT1074HVCT7
SHDN
VC LT1074IT7
FB
GND
LT1074HVIT7
ILIM
VSW
LT1076CT7
VIN LT1076HVCT7
BOTTOM VIEW
VC
1
2
43
VIN
CASE
IS GND
FB VSW
K PACKAGE
4-LEAD TO-3 METAL CAN
LT1074: θJC = 2.5°C, θJA = 35°C/W
LT1076: θJC = 4°C, θJA = 35°C/W
OBSOLETE PACKAGE
Consider the T5 Package for Alternate Source
TAB IS
GND
FRONT VIEW
5
4
3
2
1
T PACKAGE
5-LEAD PLASTIC TO-220
LEADS ARE FORMED STANDARD FOR
STRAIGHT LEADS, ORDER FLOW 06
VIN
VSW
GND
VC
FB
LT1074: θJC = 2.5°C, θJA = 50°C/W
LT1076: θJC = 4°C, θJA = 50°C/W
LT1074: θJC = 2.5°C, θJA = 50°C/W
LT1076: θJC = 4°C, θJA = 50°C/W
*Assumes package is soldered to 0.5 IN2 of 1 oz. copper over internal ground plane or over back side plane.
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ORDER PART
NUMBER
LT1074CK
LT1074HVCK
LT1074MK
LT1074HVMK
LT1076CK
LT1076HVCK
LT1076MK
LT1076HVMK
LT1074CT
LT1074HVCT
LT1074IT
LT1074HVIT
LT1076CT
LT1076HVCT
LT1076IT
LT1076HVIT
2
sn1074 1074fds


Part Number LT1076
Description Step-Down Switching Regulator
Maker Linear Technology
Total Page 16 Pages
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