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Home > Low Dropout Linear Regulators
LR9103 Datasheet









The UTC  LR9103 is a typical LDO (linear regulator) with the

features of high output voltage accuracy, low supply current, low

ON-resistance, and high ripple rejection.

During operation of the UTC  LR9103, the dropout voltage is

very low and the response of line transient and load transient are

very well.

Internally, there’re many functions of  UTC  LR9103 which can

be seen in the block figure. There are a voltage reference unit, an

error amplifier, resistor-net for voltage setting, a current limit circuit,

and a chip enable circuit in each UTC LR9103. 

The UTC LR9103 can be used as an ideal of the power supply

for hand-held communication equipment, such as: power source for

portable communication equipment, power source for electrical

appliances, for example, cameras, VCRs and camcorders and

power source for battery-powered equipment.





* Ultra Supply Current:  36µA (Typ.)

* Standby Mode:  0.1µA (Typ.)

* Very Low Dropout Voltage:  0.13V (Typ.) @ IOUT =150mA, VOUT =2.85V

* Ripple Rejection:  75dB (Typ.) @ f=1kHz,VOUT=2.85V

* Temperature-Drift Coefficient of Output Voltage: ±50ppm/°C (Typ.)

* Well Line Regulation:  0.02%/ V (Typ.)

*Output Voltage Accuracy:  ±1.0% (Typ.)

* Internal Fold Back Protection Circuit: 50mA (Typ.) (Current at short mode)

*CIN=COUT=0.47µF or more (Ceramic capacitors) are recommended to be used with this IC   

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