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LTC1429CS8-4 Datasheet

  • LTC1429CS8-4

  • Clock-Synchronized Switched Capacitor Regulated Voltage Inve...

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LTC1429
Clock-Synchronized
Switched Capacitor
Regulated Voltage Inverter
FEATURES
s
s
DESCRIPTION
The LTC
廬
1429 is a switched-capacitor voltage inverter de-
signed to provide a regulated negative voltage from a single
positive supply and permits clock synchronization in noise
sensitive systems. The LTC1429CS operates from a single 3V
to 8V supply and provides an adjustable output voltage from
鈥?1.25V to 鈥?8V. An on-chip resistor string allows the
LTC1429CS to be configured for output voltages of 鈥?3.5V,
鈥?V, 鈥?.5V or 鈥?5V. The LTC1429CS8 is optimized for
applications which require a fixed 鈥?V output from a 5V
supply and requires only a single external 0.1碌F flying
capacitor. The LTC1429CS requires one or two external
0.1碌F capacitors, depending on input voltage. Both versions
require additional external input and output bypass capaci-
tors. An optional compensation capacitor at ADJ/COMP can
be used to reduce the output voltage ripple.
Each version of the LTC1429 guarantees output regulation of
5%. The LTC1429 includes an open-drain REG output which
pulls low when the output is within 5% of the set value. Output
ripple is typically as low as 5mV. The LTC1429 requires an
external clock applied to the SYNC/SD for normal operation
and consumes a typical quiescent current of 600碌A(chǔ). Holding
the SYNC/SD either high or low brings the device into
shutdown and the supply current drops to 0.2碌A(chǔ). For appli-
cations which don鈥檛 have a clock signal available, the LTC1261
provides the same functionality with an internal oscillator. For
applications which require output ripple below 1mV, see the
LTC1550/LTC1551. The LTC1429CS is available in a 14-pin
SO package and the LTC1429CS8 is available in an 8-pin SO
package.
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Regulated Negative Voltage from a Single
Positive Supply
External Clock for Synchronization in Noise
Sensitive Systems
REG Output Indicates Output is in Regulation
Low Output Ripple: 5mV Typ
Can Provide Regulated 鈥?5V from a 3V Supply
Supply Current: 600碌A(chǔ) Typ
Shutdown Mode Drops Supply Current to 0.2碌A(chǔ)
Up to 12mA Output Current
Adjustable or Fixed Output Voltages
Requires Only Three or Four External Caps
Output Regulation: 5%
Available in SO-8 Packages
APPLICATIONS
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GaAs FET Bias Generators
Negative Supply Generators
Battery Powered Systems
Single Supply Applications
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATION
鈥?4V Generator with Power Valid
5V
1
2
C1
0.1碌F
C2
0.1碌F
3
4
V
CC
SYNC/SD
8
7
6
5
*C3
0.001碌F
10k
5V
POWER VALID
V
OUT
= 鈥?V AT 10mA
C4
3.3碌F
LTC1429 鈥?TA01
Waveforms for 鈥?V Generator with Power Valid
0V
V
OUT
鈥?4V
POWER VALID
SYNC/SD
5V
0V
5V
0V
0.2ms/DIV
LTC1429 鈥?TA02
C1
+
REG
LTC1429-4CS8
C1
鈥?/div>
GND
OUT
COMP
*OPTIONAL
U
+
U
U
1

LTC1429CS8-4 產(chǎn)品屬性

  • 0現(xiàn)貨

  • 停產(chǎn)

  • *

  • 管件

  • 停產(chǎn)

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  • 表面貼裝型

  • 8-SOIC（0.154"，3.90mm 寬）

  • 8-SO

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