Datasheet 搜索 > DC/DC转换器 > Linear Technology（凌力尔特） > LTC1261CS8 数据手册 > LTC1261CS8 数据手册 1/18 页
器件3D模型￥ 474.387
LTC1261CS8 数据手册 - Linear Technology（凌力尔特）
制造商:
Linear Technology（凌力尔特）
分类:
DC/DC转换器
封装:
SOIC-8
Pictures:
3D模型
符号图
焊盘图
引脚图
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技术参数、封装参数在P3
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LTC1261CS8数据手册
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LTC1261
1
1261fb
For more information www.linear.com/LTC1261
TYPICAL APPLICATION
FEATURES DESCRIPTION
Switched Capacitor
Regulated Voltage Inverter
The LT C
®
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 –1.25V to –8V. An on-chip resistor
string allows the LTC1261CS to be configured for output
voltages of –3.5V, –4
V, –4.5V or –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 0.1µF
capacitor and provides adjustable and fixed output voltage
options in 8-lead SO packages. The LTC1261CS requires
one or two external 0.1µF 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 600µA when operating and 5µA in shutdown.
The LTC1261 is available in a 14-lead narrow body SO
package and an 8-lead SO package.
APPLICATIONS
n
Regulated Negative Voltage from a
Single Positive Supply
n
Can Provide Regulated –5V from a 3V Supply
n
REG Pin Indicates Output is in Regulation
n
Low Output Ripple: 5mV Typ
n
Supply Current: 600µA Typ
n
Shutdown Mode Drops Supply Current to 5µA
n
Up to 15mA Output Current
n
Adjustable or Fixed Output Voltages
n
Requires Only Three or Four External Capacitors
n
Available in SO-8 Packages
n
GaAs FET Bias Generators
n
Negative Supply Generators
n
Battery-Powered Systems
n
Single Supply Applications
L, LT , LT C , LT M, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
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2
3
4
8
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5
LTC1261-4
SHDN
REG
OUT
COMP
V
CC
C1
+
C1
–
GND
C2
0.1µF
C4
3.3µF
V
OUT
= –4V
AT 10mA
POWER VALID
5V
C1
1µF
5V
10k
C3*
100pF
*OPTIONAL
+
LTC1261 • TA01
0V
0V
0V
0.2ms/DIV
5V
–4V
POWER VALID
SHDN
OUT
5V
LTC1261 • TA02
–4V Generator with Power Valid
Waveforms for –4V Generator with Power Valid
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