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| 型号： | LTC1682IS8#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 1/12页 |
| 文件大小： | 0K |
| 描述： | IC REG MULTI CONFIG ADJ 8SOIC |
| 标准包装： | 100 |
| 类型： | 升压（升压），切换电容（充电泵），倍增器 |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 2.5 V ~ 5.5 V |
| 输入电压： | 1.8 V ~ 4.4 V |
| PWM 型： | Burst Mode? |
| 频率 - 开关： | 550kHz |
| 电流 - 输出： | 90mA |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 包装： | 管件 |
| 供应商设备封装： | 8-SOIC |
LTC1682/LTC1682-3.3/LTC1682-5
Doubler Charge Pumps with
Low Noise Linear Regulator
FEATURES
DESCRIPTIO
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Low Output Noise: 60 μ V RMS (100kHz BW)
Adjustable or Fixed Boosted Output
Adjustable Output Voltage Range: 2.5V to 5.5V
Fixed Output Voltages: 3.3V, 5V
Wide Input Voltage Range: 1.8V to 4.4V
The LTC ? 1682/LTC1682-3.3/LTC1682-5 are doubler charge
pumps with an internal low noise, low dropout (LDO) linear
regulator. These parts are designed to provide a low noise
boosted supply voltage for powering noise sensitive devices
such as high frequency VCOs in wireless applications.
Uses Small Ceramic Capacitors
No Inductors Required
Output Current up to 50mA
550kHz Switching Frequency
Low Operating Current: 150 μ A
Low Shutdown Current: 1 μ A
Internal Thermal Shutdown and Current Limiting
Available in 8-Pin MSOP and SO Packages
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APPLICATIO S
An internal doubler charge pump converts a 1.8V to 4.4V
input to a boosted output, while the internal LDO regulator
converts the boosted voltage to a low noise regulated output.
The adjustable version allows the user to set V OUT via external
resistors connected to FB. The regulator is capable of supply-
ing up to 50mA of output current. Shutdown reduces the
supply current to < 5 μ A, removes the load from V IN by
disabling the regulator and discharges V OUT to ground
through a 100 ? switch.
The LTC1682 LDO regulator is stable with only 2 μ F on the
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VCO Power Supplies in Cellular Phones
2-Way Pagers
Wireless PCMCIA Cards
Portable Medical Instruments
Low Power Data Acquisition
Remote Transmitters
output. Small ceramic capacitors can be used, reducing PC
board area.
The LTC1682/LTC1682-3.3/LTC1682-5 are short-circuit and
over temperature protected. The parts are available in 8-pin
MSOP and SO packages.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATIO
4.2V VCO Power Supply, V IN = 2.5V to 4.4V
SHUTDOWN
Open-Loop Close-In Phase Noise
V IN
1k
V IN
2.5V TO
4.4V
4.7 μ F
0.22 μ F
4.7 μ F
8
7
6
5
C + SHDN
C – GND
CPO V OUT
LTC1682
FB
1
2
3
4
4.2V
4.7 μ F
36k
1 μ F
15k
1000pF
B P
VCO
MURATA
MQE001-902
M C
1000pF
1000pF
f OUT
902MHz
100k
V C
4.7 μ F
AMPLITUDE
10dB/DIV
1682 TA01
CENTER = 902MHz
SPAN = 100kHz
RES BW = 1kHz
VBW = 30Hz
SWP = 10 sec
REF = 0dBm
1682 TA02
1
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