LT1076-5 Linear Technology, LT1076-5 Datasheet

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LT1076-5

Manufacturer Part Number
LT1076-5
Description
5V Step-Down Switching Regulator
Manufacturer
Linear Technology
Datasheet
FEATURE
A
TYPICAL
PPLICATI
5V Output Buck Converter
Tapped Inductor Buck Converter with 4A Output
at 5V
Positive-to-Negative Converter
Fixed 5V Output
2A On-Board Switch
100kHz Switching Frequency
2% Output Voltage Tolerance Over Temperature
Greatly Improved Dynamic Behavior
Available in Low Cost 5-Lead Package
Only 9.5mA Quiescent Current
Operates Up to 60V Input
S
A
O
PPLICATI
U
8V TO 40V
S
+
O
U
C3
200 F
V
GND
IN
LT1076-5
SENSE
V
V
C
SW
R3
1.5k
Basic Positive Buck Converter
C2
0.033 F
MBR340*
D
The LT1076-5 is a 2A fixed 5V output monolithic bipolar
switching regulator which requires only a few external
parts for normal operation. The power switch, all oscillator
and control circuitry, all current limit components, and an
output monitor are included on the chip. The topology is
a classic positive “buck” configuration but several design
innovations 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 LT1076-5 to drive a
tapped inductor in the buck mode with output currents up
to 4A.
The LT1076-5 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 LT1076-
5 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 LT1076-5 is available in a low cost 5-lead TO-220
package with frequency pre-set at 100kHz and current
limit at 2.6A. See Application Note 44 for design details.
100 H**
ESCRIPTIO
+
25V
Switching Regulator
C1
500 F
5V
1.8A
U
**
*
MBR330P MAY BE USED
FOR V
COILTRONICS #100-1-52
HURRICANE #HL-AG210LL
VALUE MAY BE REDUCED TO 50 H
FOR OUTPUT LOADS BELOW 1.5A
5V Step-Down
IN
25V
LT1076-5 TA01
LT1076-5
1

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LT1076-5 Summary of contents

Page 1

... TO 40V + D ESCRIPTIO The LT1076 fixed 5V output monolithic bipolar switching regulator which requires only a few external parts for normal operation. The power switch, all oscillator and control circuitry, all current limit components, and an output monitor are included on the chip. The topology is a classic positive “ ...

Page 2

... LT1076-5............................................................ 64V LT1076HV-5 ....................................................... 75V Switch Voltage with Respect to Ground Pin (V Negative) SW LT1076-5 (Note 5).............................................. 35V LT1076HV-5 (Note 5) ......................................... 45V Sense Pin Voltage ........................................... – 2V, 10V Maximum Operating Ambient Temperature Range LT1076C-5, LT1076HVC-5 ..................... LT1076I-5, LT1076HVI-5 .................. – Maximum Operating Junction Temperature Range LT1076C-5, LT1076HVC-5 ................... 125 C LT1076I-5, LT1076HVI-5 ................ – ...

Page 3

... Switch Duty Cycle = 0 Fully Shut Down Note 5: Switch to input voltage limitation must also be observed. Note 40V for the LT1076-5 and 60V for the LT1076HV-5. MAX Note 7: Error amplifier voltage gain and transconductance are specified relative to the internal feedback node. To calculate gain and ...

Page 4

... LT1076-5 PACKAGE DESCRIPTIO 0.060 (1.524) +0.012 0.331 –0.020 +0.305 8.407 –0.508 +0.012 0.143 –0.020 0.030 ± 0.008 +0.305 3.632 (0.762 ± 0.203) –0.508 0.390 – 0.415 (9.906 – 10.541) 0.460 – 0.500 (11.684 – 12.700) 0.057 – 0.077 (1.448 – ...

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