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參數(shù)資料
| 型號(hào)： | LTC1429CS |
| 廠(chǎng)商： | LINEAR TECHNOLOGY CORP |
| 元件分類(lèi)： | 穩(wěn)壓器 |
| 英文描述： | Clock-Synchronized Switched Capacitor Regulated Voltage Inverter |
| 中文描述： | SWITCHED CAPACITOR REGULATOR, 700 kHz SWITCHING FREQ-MAX, PDSO14 |
| 封裝： | 0.150 INCH, PLASTIC, SO-14 |
| 文件頁(yè)數(shù)： | 1/12頁(yè) |
| 文件大小： | 275K |
| 代理商： | LTC1429CS |
1
LTC1429
I
Regulated Negative Voltage from a Single
Positive Supply
I
External Clock for Synchronization in Noise
Sensitive Systems
I
REG Output Indicates Output is in Regulation
I
Low Output Ripple: 5mV Typ
I
Can Provide Regulated –5V from a 3V Supply
I
Supply Current: 600
μ
A Typ
I
Shutdown Mode Drops Supply Current to 0.2
μ
A
I
Up to 12mA Output Current
I
Adjustable or Fixed Output Voltages
I
Requires Only Three or Four External Caps
I
Output Regulation: 5%
I
Available in SO-8 Packages
APPLICATIO
S
U
The LTC
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
–1.25V to –8V. An on-chip resistor string allows the
LTC1429CS to be configured for output voltages of –3.5V,
–4V, –4.5V or –5V. The LTC1429CS8 is optimized for
applications which require a fixed –4V output from a 5V
supply and requires only a single external 0.1
μ
F flying
capacitor. The LTC1429CS requires one or two external
0.1
μ
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
μ
A. Holding
the SYNC/SD either high or low brings the device into
shutdown and the supply current drops to 0.2
μ
A. For appli-
cations which don’t 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.
Clock-Synchronized
Switched Capacitor
Regulated Voltage Inverter
FEATURES
DESCRIPTIO
N
U
I
GaAs FET Bias Generators
I
Negative Supply Generators
I
Battery Powered Systems
I
Single Supply Applications
TYPICAL APPLICATIO
N
U
–4V Generator with Power Valid
, LTC and LT are registered trademarks of Linear Technology Corporation.
1
2
3
4
8
7
6
5
C2
0.1
μ
F
C1
0.1
μ
F
*C3
0.001
μ
F
V
OUT
= –4V AT 10mA
C4
3.3
μ
F
POWER VALID
5V
5V
V
CC
GND
C1
+
C1
–
SYNC/SD
COMP
REG
OUT
LTC1429-4CS8
+
10k
LTC1429 TA01
*OPTIONAL
0.2ms/DIV
0V
5V
SYNC/SD
0V
5V
POWER VALID
–4V
0V
V
OUT
Waveforms for –4V Generator with Power Valid
LTC1429 TA02
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