SA1117B Просмотр технического описания (PDF) - Silan Microelectronics

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SA1117B

800 mA LDO VOLTAGE REGULATOR

Silan Microelectronics 

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

Page 5 of 8

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