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LTC1174-3.3 Datasheet

  • LTC1174-3.3

  • High Efficiency Step-Down and Inverting DC/DC Converter

  • 354.23KB

  • 16頁(yè)

  • LINER

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LTC1174
LTC1174-3.3/LTC1174-5
High Efficiency
Step-Down and Inverting
DC/DC Converter
FEATURES
s
s
DESCRIPTIO
s
s
s
s
s
s
s
s
s
s
High Efficiency: Up to 94%
Peak Inductor Current Independent of
Inductor Value
Short-Circuit Protection
Optimized for 5V to 鈥?5V Applications
Wide V
IN
Range: 4V to 18.5V
Low Dropout Operation
Low-Battery Detector
Pin Selectable Current Limit
Internal 0.9鈩?Power Switch: V
IN
= 9V
Only Four External Components Required
130碌A(chǔ) Standby Current
Active Low Micropower Shutdown
The LTC
廬
1174 is a simple current mode DC/DC converter
ideally suited for 9V to 5V, 5V to 3.3V, or 5V to 鈥?5V
operation. With an internal 0.9鈩?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 LT1174 draws only 130碌A(chǔ).
In shutdown, it draws a mere 1碌A(chǔ) 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.
and LTC are registered trademarks and LT is a trademark of Linear Technology Corporation.
APPLICATI
s
s
s
s
s
s
S
Distributed Power Systems
Step-Down Converters
Inverting Converters
Memory Backup Supply
Portable Instruments
Battery-Powered Equipment
TYPICAL APPLICATI
V
IN
9V
3
2
7
High Efficiency Step-Down Converter
100
LTC1174-5 Efficiency
3
脳
15碌F*
25V
6
V
IN
LB
IN
LB
OUT
I
PGM
LTC1174-5
GND
4
SHUTDOWN
V
OUT
SW
+
8
1
5
100碌H
1N5818
鈥?/div>
95
V
IN
= 6V
EFFICIENCY (%)
90
85
80
75
70
5V
175mA
+
100碌F**
10V
1174 TA01
* (3) AVX TPSD156K025
** AVX TPSD107K010
鈥?/div>
COILTRONICS CTX100-4
1
U
V
IN
= 9V
L = 100碌H
V
OUT
= 5V
I
PGM
= 0V
10
LOAD CURRENT (mA)
100 200
1174 TA02
UO
UO
1

LTC1174-3.3相關(guān)型號(hào)PDF文件下載

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