参数资料
型号: LTC1986ES6#TRMPBF
厂商: Linear Technology
文件页数: 6/8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#PBF
LTC1986ES6#PBF-ND
LTC1986
APPLICATIO N S I N FOR M ATIO N
Output Ripple
Normal 5V mode operation produces voltage ripple on the
V OUT pin. Output voltage ripple is required for regulation.
Low frequency ripple exists due to the hysteresis in the
sense comparator and propagation delays in the charge
pump enable/disable circuits. High frequency ripple is
also present mainly from the ESR (equivalent series resis-
tance) in the output capacitor. Typical output ripple with
V IN = 3V under maximum load is 75mV P-P with a low ESR
2.2 μ F output capacitor and a 0.047 μ F C1 capacitor. For
applications requiring V IN to exceed 3.3V or for applica-
tions requiring < 75mV of peak-to-peak ripple, a 3.3 μ F to
10 μ F C OUT capacitor is recommended. Slight further de-
creases in output ripple can be achieved by using C OUT
capacitors larger than 10 μ F.
Protection Features
The LTC1986 provides several protection features.
Undervoltage lockout prevents any current from flowing
between V IN and V OUT until the V IN voltage
exceeds 1.4V (typ). This prevents undesirable glitches
during power-up. The parts also limit inrush current
during power-up to under 200mA regardless of V IN volt-
age, operating mode and output load by disabling the main
direct connect switch (3V mode) or the charge pump
(5V mode) and enabling a 50 ? series switch between V IN
and V OUT until V OUT reaches V IN /2. The parts are also
short-circuit protected and can survive an indefinite short
from V OUT to GND regardless of operating mode or input
voltage. In the event of thermal overload, the parts will
enter thermal shutdown if the junction temperature
exceeds 165 ° C and return to normal operation once the
junction temperature drops to 150 ° C.
1986fa
6
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