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LTC1261CS8-4.5 Datasheet

  • LTC1261CS8-4.5

  • Switched Capacitor Regulated Voltage Inverter

  • 16頁

  • LINER

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LTC1261
Switched Capacitor
Regulated Voltage Inverter
FEATURES
s
s
s
s
s
s
s
s
s
s
DESCRIPTIO
Regulated Negative Voltage from a
Single Positive Supply
Can Provide Regulated 鈥?5V from a 3V Supply
REG Pin Indicates Output is in Regulation
Low Output Ripple: 5mV Typ
Supply Current: 600碌A(chǔ) Typ
Shutdown Mode Drops Supply Current to 5碌A(chǔ)
Up to 15mA Output Current
Adjustable or Fixed Output Voltages
Requires Only Three or Four External Capacitors
Available in SO-8 Packages
APPLICATI
s
s
s
s
S
GaAs FET Bias Generators
Negative Supply Generators
Battery-Powered Systems
Single Supply Applications
The LTC
廬
1261 is a switched-capacitor voltage inverter
designed to provide a regulated negative voltage from a
single positive supply. The LTC1261CS operates from a
single 3V to 8V supply and provides an adjustable output
voltage from 鈥?.25V to 鈥?8V. An on-chip resistor string
allows the LTC1261CS to be configured for output volt-
ages of 鈥?3.5V, 鈥?4V, 鈥?4.5V or 鈥?5V with no external
components. The LTC1261CS8 is optimized for applica-
tions which use a 5V or higher supply or which require
low output voltages. It requires a single external 0.1碌F
capacitor and provides adjustable and fixed output voltage
options in 8-pin SO packages. The LTC1261CS requires
one or two external 0.1碌F capacitors, depending on input
voltage. Both versions require additional external input
and output bypass capacitors. An optional compensation
capacitor at ADJ/COMP can be used to reduce the output
voltage ripple.
Each version of the LTC1261 will supply up to 12mA
output current with guaranteed output regulation of 5%.
The LTC1261 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. Quiescent current
is typically 600碌A(chǔ) when operating and 5碌A(chǔ) in shutdown.
The LTC1261 is available in a 14-pin narrow body SO
package and an 8-pin SO package.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATION
鈥?4V Generator with Power Valid
5V
5V
C1
1碌F
C2
0.1碌F
1
2
V
CC
+
Waveforms for 鈥?4V Generator with Power Valid
0V
SHDN
8
10k
7
POWER VALID
V
OUT
= 鈥?V
AT 10mA
OUT
鈥?4V
5V
SHDN
0V
5V
POWER VALID
0V
LTC1261 鈥?TA01
REG
C1
LTC1261-4
3
6
OUT
C1
鈥?/div>
4
C3*
100pF
*OPTIONAL
+
GND
COMP
5
C4
3.3碌F
U
0.2mS/DIV
LTC1261 鈥?TAO2
U
UO
1

LTC1261CS8-4.5 產(chǎn)品屬性

  • LTC1261

  • 100

  • 集成電路 (IC)

  • PMIC - 穩(wěn)壓器 - DC DC 開關(guān)穩(wěn)壓器

  • -

  • 切換式電容器（充電泵），反相

  • 固定

  • 1

  • -4.5V

  • 3 V ~ 8 V

  • -

  • 550kHz

  • 15mA

  • 無

  • 0°C ~ 70°C

  • 表面貼裝

  • 8-SOIC（0.154"，3.90mm 寬）

  • 管件

  • 8-SOIC

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