BL1117
BLOCK DIAGRAM
DETAILED DESCRIPTION
BL1117 is a series of low dropout voltage, three terminal regulators. Its application circuit is very simple:
the fixed version only needs two capacitors and the adjustable version only needs two resistors and two capacitors to
work. It is composed of some modules including start-up circuit, bias circuit, bandgap, thermal shutdown, current limit,
power transistors and its driver circuit and so on.
The thermal shut down modules can assure chip and its application system working safety when the junction
temperature is larger than 140°C .
The bandgap module provides stable reference voltage, whose temperature coefficient is compensated by careful design
considerations. The temperature coefficient is under 100 ppm/°C . And the accuracy of output voltage is guaranteed by
trimming technique.
TYPICAL APPLICATION
BL1117 has an adjustable version and six fixed versions (1.2V, 1.5V, 1.8V, 2.5V, 3.3V, 5V and 12V)
Fixed Output Voltage Version
LC1117
BL1117
Vout
Vin
Vin
Vout
Gnd
10uF
10uF
Application circuit of BL1117 fixed version
1) Recommend using 10uF tan capacitor or MLCC capacitor as bypass capacitor (C1) for all application circuit.
2) Recommend using 10uF tan capacitor MLCC capacitor to assure circuit stability.
3) Capacitor ESR range: 3mΩ ~ 22Ω
Adjustable Output Voltage Version
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