参数资料
型号: LTC1986ES6#TRM
厂商: Linear Technology
文件页数: 4/8页
文件大小: 0K
描述: IC REG BOOST SWITCHED CAP SOT23
标准包装: 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:
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
其它名称: LTC1986ES6
LTC1986ES6-ND
LTC1986
PI N FU N CTIO N S
V OUT (Pin 1): Charge Pump Output. The V OUT voltage will
depend on the MODE pin input voltage. V OUT = 0V in
shutdown mode, V OUT = V IN in 3V mode and V OUT = 5V in
5V mode. The LTC1986 provides a 2.9V regulated output
when the part is in 3V mode and the V IN voltage is below
2.85V. This feature allows the input voltage to be below the
minimum voltage specification for 3V SIM cards without
violating the SIM V CC specification. Bypass the V OUT pin
with a ≥ 2.2 μ F low ESR capacitor to ground.
GND (Pin 2): Ground. Connect to a ground plane for best
performance.
MODE (Pin 3): MODE Input Pin. The voltage on this pin
determines the operating mode of the LTC1986. It oper-
ates in either shutdown mode, 3V mode or 5V mode
depending on the MODE pin voltage with respect to V IN .
SI PLIFIED BLOCK DIAGRA
The three different modes can be realized by using two
external resistors as shown in the typical application
circuit. If V MODE < V IN /2 – 0.1V, the part is in shutdown
mode.If V IN /2 + 0.1V < V MODE < V IN – 1V, the part is in 5V
mode. If V IN – 0.25V < V MODE , the part is in 3V mode. To
achieve the lowest possible shutdown current, the MODE
pin should be pulled to 0V, i.e., both the SHDN and 3/5
signals from the controller should be pulled low.
C1 – (Pin 4): Charge Pump Flying Capacitor Negative
Terminal.
C1 + (Pin 5): Charge Pump Flying Capacitor Positive
Terminal.
V IN (Pin 6): Input Supply Voltage. Bypass V IN with a
≥ 0.1 μ F low ESR capacitor to ground.
50 ?
C1 –
4
5
C1 +
2.5 ?
LTC1986
V IN 6
SOFT START
5V MODE
CHARGE
PUMP
3V MODE
1 V OUT
2.9V BOOST
1.25V
+
900kHz
OSC
MODE 3
V IN – 0.6V
LOGIC
3V
5V
UVLO/
THERMAL
SHDN
1.25V
REF
SHDN
V IN /2
SHDN
2
GND
1986 BD
1986fa
4
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