SA1117B Datasheet, PDF (5/8 Pages) Silan Microelectronics Joint-stock – 800mA LDO VOLTAGE REGULATOR

SA1117B
FUNCTION DESCRIPTION
The SA1117B is a LDO regulator, it’s pass transistor is made up of a single NPN transistor being driven by a
PNP. The dropout voltage is defined as: VDROP = VBE+ VSAT.
The SA1117B series of fixed and adjustable regulators are easy to use. Output voltages are 1.2V, 1.5V, 1.8V,
2.5V, 3.3V, and 5.0V.On-chip thermal shut down provides protection against any combination of overload and
ambient temperature that would create excessive junction temperature.
The SA1117B requires an output capacitor for device stability. Its value of 22µF tantalum covers all cases of
bypassing the adjustment terminal. Without bypassing the adjustment terminal smaller capacitors can be used
with equally good results which depend upon the application circuit. In general, linear regulator stability
decreases with higher output currents.
TYPICAL APPLICATION CIRCUIT
Figure 1. Typical Fixed Output Voltage
Figure 2. Typical Adjustable Output Voltage
Note: The circuit and parameters are reference only, please set the parameters of the real application circuit based
on the real test.
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http://www.silan.com.cn
REV:1.0 2008.08.12
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