LT1176 Linear Technology, LT1176 Datasheet

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LT1176

Manufacturer Part Number
LT1176
Description
Step-Down Switching Regulator
Manufacturer
Linear Technology
Datasheet

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FEATURE
D
A
The LT1176 is a 1A monolithic bipolar switching regulator
which requires only a few external parts for normal opera-
TYPICAL
10V T0 35V
PPLICATI
ESCRIPTIO
Buck Converter with Output Voltage Range of
2.5V to 30V
Positive-to-Negative Converter
Negative Boost Converter
Mulitple Output Buck Converter
1.2A On-Board Switch
100kHz Switching Frequency
Excellent Dynamic Behavior
DIP and Surface Mount Packages
Only 8mA Quiescent Current
Preset 5V Output Available
Operates Up to 35V Input
Micropower Shutdown Mode
*COILTRONICS #100-1-52
PULSE ENGINEERING, INC. #PE-92102
HURRICANE #HL-AG210LL
THESE ARE LOW COST POWDERED IRON CORES. OPTIMUM EFFICIENCY
AND SMALLEST SIZE IS OBTAINED BY USING A LOW LOSS CORE SUCH
AS MAGNETICS INC. KOOL M . SEE EFFICIENCY GRAPH.
+
Basic 5V Positive Buck Converter
C3
100 F
S
A
V
O
PPLICATI
IN
GND
LT1176-5
U
U
S
SENSE
V
V
C
SW
R3
2.7k
C2
0.01 F
O
U
1N5819
100 H
L1*
LT1176/76-5 • TA01
+
C1
470 F
25V
5V, 0.8A
tion. The power switch, all oscillator and control circuitry,
and all current limit components are included on the chip.
The topology is a classic positive “buck” configuration but
several design innovations allows this device to be used as
a positive-to-negative converter, a negative boost con-
verter, and as a flyback converter. The switch output is
specified to swing below ground.
The LT1176 uses a true analog multiplier in the feedback
loop. This makes the device respond nearly instantaneously
to input voltage fluctuations and makes loop gain indepen-
dent of input voltage. As a result, dynamic behavior of the
regulator is significantly improved over previous designs.
On-chip pulse by pulse current limiting makes the LT1176
nearly bust-proof for output overloads or shorts. The input
voltage range as a buck converter is 8V to 35V, but a self-
boot feature allows input voltages as low as 5V in the
inverting and boost configurations.
The LT1176 is available in a low cost 8-lead DIP package
with frequency preset at 100kHz and current limit at 1.7A An
adjustable output is offered as well as a preset 5V version.
For further design details and application help, see the
LT1074/LT1076 data sheet and Application Note 44.
90
80
70
60
L = 100 H ON MAGNETICS INC.
SIZE T-50 KOOL M CORE
V
0.1
IN
5V Buck Converter Efficiency
= 10V
0.2
Switching Regulator
0.3
LOAD CURRENT (A)
V
IN
0.4
= 20V
LT1176/LT1176-5
0.5
0.6
0.7
LT1176/76-5 • TA02
0.8
Step-Down
0.9
1.0
1

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LT1176 Summary of contents

Page 1

... The LT1176 is available in a low cost 8-lead DIP package with frequency preset at 100kHz and current limit at 1.7A An adjustable output is offered as well as a preset 5V version. ...

Page 2

... LIM Maximum Operating Ambient Temperature Range LT1176C/LT1176C-5 .............................. Maximum Operating Junction Temperature Range LT1176C/LT1176C-5 ............................ 125 C Storage Temperature Range ................ – 150 C Lead Temperature (Soldering, 10 sec) 300 C *These thermal resistance numbers are for typical mounting technique. Lower thermal resistance can be obtained with large copper lands, thermal glues or heatsinks. ...

Page 3

... Note 4: Switch frequency is internally scaled down when the feedback pin Application Hints Although the LT1176 has a peak switch rating of 1.2A and a maximum duty cycle of 85%, it must be used cautiously in applications which require high switch current and high duty cycle simultaneously, to avoid excessive chip temperature ...

Page 4

... TYP : 499-3977 500 0.16 COMP + C2 – R 400 SWITCH OUTPUT ( LT1176/76-5 • BD 0.400 (10.160) MAX 0.250 ± 0.010 (6.350 ± 0.254 0.496 – 0.512 (12.598 – 13.005 ...

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