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参数资料
| 型号： | LTC1986ES6#TR |
| 厂商： | Linear Technology |
| 文件页数： | 1/8页 |
| 文件大小： | 0K |
| 描述： | IC REG BOOST SWITCHED CAP SOT23 |
| 标准包装： | 2,500 |
| 类型： | 升压（升压），切换电容（充电泵） |
| 输出类型： | 固定 |
| 输出数： | 1 |
| 输出电压： | 3V，5V |
| 输入电压： | 2.6 V ~ 4.4 V |
| 频率 - 开关： | 900kHz |
| 电流 - 输出： | 10mA |
| 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： | SOT-23-6 细型，TSOT-23-6 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | TSOT-23-6 |
LTC1986
3V/5V SIM Power Supply
in ThinSOT
FEATURES
DESCRIPTIO
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V IN Range: 2.6V to 4.4V
Ultralow Power
Operating Current: 14 μ A
Shutdown Current: <1 μ A
No Inductors
Short-Circuit/Thermal Protected
Ultrasmall Application Circuit (< 0.045in 2 )
Low Profile (1mm) ThinSOT TM
Step-Up Charge Pump Generates 5V
Output Current: 10mA
V IN to V OUT Direct Connection for 3V SIMs
Switching Frequency: 900kHz
Soft-Start Limits Inrush Current at Turn-On
Output Driven to Ground During Shutdown
The LTC ? 1986 is a micropower charge pump DC/DC
converter that provides power for either 3V or 5V GSM
SIM cards. It operates in one of three modes: V OUT = 5V
(5V mode), V OUT = V IN (3V mode) or shutdown. The input
voltage range is 2.6V to 4.4V and the part can provide
10mA of output current. The LTC1986 allows V IN to drop
as low as 2.6V by providing a boost feature in 3V mode. In
3V mode, V OUT is connected directly to V IN through a 2.5 ?
switch until V IN drops below 2.85V. When V IN is below
2.85V, the part automatically boosts V OUT to maintain a
regulated 2.9V output, thereby ensuring V OUT stays within
the 3V SIM V CC specification.
Extremely low operating current (14 μ A typical with no
load) and low external parts count make the part ideally
suited for small, light load battery-powered applications.
GSM Cellular Telephones
PCS/DCS Cellular Telephones
Portable POS Terminals
APPLICATIO S
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The total PCB area of the application circuit shown below
is less than 0.045in 2 . Protection features include inrush
current limiting, undervoltage lockout, short circuit and
thermal overload protection. The LTC1986 is available in
a low profile (1mm) SOT-23 package.
, LTC and LT are registered trademarks of Linear Technology Corporation.
ThinSOT is a trademark of Linear Technology Corporation.
TYPICAL APPLICATIO
3V/5V SIM Power Supply
Output Voltage vs Input Voltage
V OUT = 5V
OR V IN
V IN = 2.6V TO 4.4V
6
T A = 25 ° C
GSM
CONTROLLER
3/5
1M
2.2 μ F
1
2
3
LTC1986
V OUT V IN
GND C1 +
MODE C1 –
6
5
4
0.1 μ F
0.047 μ F
5
4
I OUT = 10mA
3V MODE
(V OUT = V IN )
5V MODE
750k
3
SHDN
SHDN 3/5
MODE
0
0
SHUTDOWN
0
1
1
0
SHUTDOWN
V OUT = 5V
2
2.5
3.0
3.5
4.0
4.5
1
1
V OUT = V IN
1986 TA01
INPUT VOLTAGE (V)
1986 TA02
1986fa
1
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