UNISONIC TECHNOLOGIES CO., LTD

LR9273

Preliminary

CMOS IC

www.unisonic.com.tw

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Copyright © 2013 Unisonic Technologies Co., Ltd

QW-R502-A30.a

SUPER LOW ON

RESISTANCE/LOW VOLTAGE

1A LDO REGULATOR



DESCRIPTION

The UTC LR9273 is a typical LDO (linear regulator) with features of

super low dropout, 1A output current capability, and -3mV typical load

regulation at 1A.

During operation of the UTC LR9273, 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 LR9273 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 LR9273.

The UTC LR9273 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.



FEATURES

* Ultra Supply Current:

60µA (Typ.)

* Standby Mode:

0.1µA (Typ.)

* Very Low Dropout Voltage:

0.18V (Typ.)

* Ripple Rejection:

70dB (Typ.)

* Temperature-Drift Coefficient

of Output Voltage:

±100ppm/°C (Typ.)

* Well Line Regulation:

0.02%/ V (Typ.)

* Output Voltage Accuracy:

±1.5% (Typ.)

* Internal Fold Back Protection

Circuit:

250mA (Typ.) @ short mode

to be used with this IC

SOP-8

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SOT-89-5