IC MULTI CONFIG ADJ 1A 8DIP

LT1176CN8

Manufacturer Part NumberLT1176CN8
DescriptionIC MULTI CONFIG ADJ 1A 8DIP
ManufacturerLinear Technology
TypeStep-Down (Buck), Inverting, Flyback
LT1176CN8 datasheet
 

Specifications of LT1176CN8

Internal Switch(s)YesSynchronous RectifierNo
Number Of Outputs1Voltage - Output2.2 ~ 29.8 V
Current - Output1AFrequency - Switching100kHz
Voltage - Input8 ~ 35 VOperating Temperature0°C ~ 70°C
Mounting TypeThrough HolePackage / Case8-DIP (0.300", 7.62mm)
Power - Output1WLead Free Status / RoHS StatusContains lead / RoHS non-compliant
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FEATURES
1.2A Onboard Switch
n
100kHz Switching Frequency
n
Excellent Dynamic Behavior
n
DIP and Surface Mount Packages
n
Only 8mA Quiescent Current
n
Preset 5V Output Available
n
Operates Up to 35V Input
n
Micropower Shutdown Mode
n
APPLICATIONS
Buck Converter with Output Voltage Range of
n
2.5V to 30V
Positive-to-Negative Converter
n
Negative Boost Converter
n
Multiple Output Buck Converter
n
DESCRIPTION
The LT
1176 is a 1A monolithic bipolar switching regulator
®
which requires only a few external parts for normal opera-
tion. The power switch, all oscillator and control circuitry
TYPICAL APPLICATION
Basic 5V Positive Buck Converter
10V T0 35V
V
V
IN
SW
LT1176-5
SENSE
GND
V
C
R3
2.7k
+
C3
C2
100µF
0.01µF
*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 Mµ. SEE EFFICIENCY GRAPH.
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 converter,
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 ver-
sion. For further design details and application help, see
the LT1074/LT1076 data sheet and Application Note 44.
L, LT, LTC, LTM, Linear Technology, SwitcherCAD and the Linear logo are registered
trademarks of Linear Technology Corporation. All other trademarks are the property of their
respective owners.
L1*
100µH
5V, 0.8A
1N5819
+
C1
470µF
25V
11765 TA01
LT1176/LT1176-5
Step-Down
Switching Regulator
5V Buck Converter Efficiency
90
L = 100µH ON MAGNETICS INC.
SIZE T-50 KOOL Mµ CORE
V
= 10V
IN
80
V
= 20V
IN
70
60
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
LOAD CURRENT (A)
11765 TA02
11765fb
1

LT1176CN8 Summary of contents

  • Page 1

    ... For further design details and application help, see the LT1074/LT1076 data sheet and Application Note 44. L, LT, LTC, LTM, Linear Technology, SwitcherCAD and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. L1* 100µ ...

  • Page 2

    ... Lower thermal resistance can be obtained with large copper lands, thermal glues or heat sinks STATUS 5 SHUTDOWN PART MARKING* PACKAGE DESCRIPTION LT1176CN8 8-Lead Plastic DIP LT1176CN8-5 8-Lead Plastic DIP LT1176CSW 20-Lead Plastic SOL LT1176CSW-5 20-Lead Plastic SOL http://www.linear.com/leadfree/ http://www.linear.com/tapeandreel/ TOP VIEW ...

  • Page 3

    ELECTRICAL CHARACTERISTICS temperature range, otherwise specifications are at T PARAMETER Switch ON Voltage (Note 2) Switch OFF Leakage Supply Current (Note 3) Minimum Supply Voltage Switch Current Limit (Note 5) Maximum Duty Cycle Switching Frequency Switching Frequency Line Regulation Error ...

  • Page 4

    LT1176/LT1176-5 ELECTRICAL CHARACTERISTICS temperature range, otherwise specifications are at T PARAMETER Status Low Level Status Delay Time Status Minimum Width Note 1: Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. Exposure to any ...

  • Page 5

    BLOCK DIAGRAM INPUT SUPPLY 0.3V 10µA + µPOWER SHUTDOWN – 2.35V CURRENT LIMIT SHUTDOWN + – SHUTDOWN OUTPUT VOLTAGE MONITOR + A1 STATUS ERROR 2.21V AMP – 2.8k 2.2k* FB/SENSE *CONNECTED ON 5V VERSION ONLY 320µ ALL ...

  • Page 6

    LT1176/LT1176-5 PACKAGE DESCRIPTION .300 – .325 (7.620 – 8.255) .008 – .015 (0.203 – 0.381) +.035 .325 –.015 ( ) +0.889 8.255 –0.381 NOTE: 1. DIMENSIONS ARE MILLIMETERS *THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR ...

  • Page 7

    ... Revised Shutdown Pin Current in Electrical Characteristics Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representa- tion that the interconnection of its circuits as described herein will not infringe on existing patent rights. ...

  • Page 8

    ... TYP www.linear.com ● .496 – .512 NOTE .394 – .419 (10.007 – 10.643) N .037 – .045 (0.940 – 1.143) .004 – .012 (0.102 – 0.305) S20 (WIDE) 0502 LT 0211 REV B • PRINTED IN USA  LINEAR TECHNOLOGY CORPORATION 1993 11765fb ...