SA1117 Datasheet, PDF (8/12 Pages) Silan Microelectronics Joint-stock – 1A LDO VOLTAGE REGULATOR

SA1117
FUNCTION DESCRIPTION
The SA1117 is a LDO regulator, its 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 SA1117 has two versions: the fixed output version and the adjustable output version. Output voltages can be
1.2V, 1.5V, 1.8V, 2.5V, 3.3V, and 5.0V.On-chip thermal shut-down circuit provides protection against overload
and overheating that would create excessive junction temperature.
The adjustable output version requires a 22 μF or bigger tantalum capacitor at output for SA1117 stability. The
capacitor for fixed output version can be smaller and should be determined base on actual application. Generally,
the stability of linear regulator stability decreases with output currents increase.
TYPICAL APPLICATION CIRCUIT
Figure 1. Typical Fixed Output Voltage
Figure 2. Typical Adjustable Output Voltage
Note: The above 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:1.3 2009.07.22
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