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LTC1174 Datasheet(PDF) 1 Page - Linear Technology

Part # LTC1174
Description  High Efficiency Step-Down and Inverting DC/DC Converter
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC1174 Datasheet(HTML) 1 Page - Linear Technology

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LTC1174
LTC1174-3.3/LTC1174-5
1174fe
High Efficiency
Step-Down and Inverting
DC/DC Converter
High Efficiency Step-Down Converter
LTC1174-5 Efficiency
High Efficiency: Up to 94%
Peak Inductor Current Independent of
Inductor Value
Short-Circuit Protection
Optimized for 5V to – 5V Applications
Wide VIN Range: 4V to 18.5V
Low Dropout Operation
Low-Battery Detector
Pin Selectable Current Limit
Internal 0.9
Ω Power Switch: VIN = 9V
Only Four External Components Required
130
µA Standby Current
Active Low Micropower Shutdown
Distributed Power Systems
Step-Down Converters
Inverting Converters
Memory Backup Supply
Portable Instruments
Battery-Powered Equipment
The LTC
®1174 is a simple current mode DC/DC converter
ideally suited for 9V to 5V, 5V to 3.3V or 5V to – 5V
operation. With an internal 0.9
Ω switch (at a supply
voltage of 9V), the LTC1174 requires only four external
components to construct a complete high efficiency
DC/DC converter.
Under a no load condition the LTC1174 draws only 130
µA.
In shutdown, it draws a mere 1
µA making this converter
ideal for current sensitive applications. In dropout, the
internal P-channel MOSFET switch is turned on continu-
ously allowing the user to maximize the life of the battery
source.
The maximum inductor current of the LTC1174 family is
pin selectable to either 340mA or 600mA, optimizing
efficiency for a wide range of applications. Operation up to
200kHz permits the use of small surface mount inductors
and capacitors.
For applications requiring higher output current or ultra-
high efficiency, see the LTC1148 data sheet.
FEATURES
DESCRIPTIO
APPLICATIO S
TYPICAL APPLICATIO
VIN
9V
3
LTC1174-5
LBIN
LBOUT
IPGM
GND
VIN
SHUTDOWN
VOUT
SW
2
7
6
8
1
5
4
100
µH
100
µF**
10V
5V
175mA
15
µF*
25V
×3
1N5818
1174 TA01
*
**
(3) AVX TPSD156K025
AVX TPSD107K010
COILTRONICS CTX100-4
+
+
LOAD CURRENT (mA)
1
100
95
90
85
80
75
70
10
100
1174 TA02
200
VIN = 6V
VIN = 9V
L = 100
µH
VOUT = 5V
IPGM = 0V
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.


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