LR1801G-25-SH2-R datasheet(4/5 Pages) UTC

4 / 5 page

LR1801

Preliminary

CMOS IC

UNISONICTECHNOLOGIESCO.,LTD

4 of 5

www.unisonic.com.tw

QW-R502-A03.d



ELECTRICAL CHARACTERISTICS (Cont.)

PARAMETER

SYMBOL TEST CONDITIONS

MIN

TYP

MAX

UNIT

ON/OFF Pin Input Current “H”

ISH

VIN=VOUT(S)+1V,VON/OFF=5.5V

-0.1

0.1

ON/OFF Pin Input Current “L”

ISL

VIN=VOUT(S)+1V,VON/OFF=0V

-0.1

0.1

Ripple Rejection

|RR|

VIN=VOUT(S)+1V,

f=1khz,

△

Vrip=0.5Vrms,

IOUT=100mA

1.2V≤VOUT(S)<3.0V

3.0V≤VOUT(S) ≤3.5V

Thermal Shutdown detection

temperature

TSD

Junction temperature

150

°C

Thermal Shutdown release

temperature

TSR

Junction temperature

120

°C

Notes: 1. The LR1801 output must be diode-clamped to ground. If used in a dual-supply system where the regulator

load is returned to a negative supply.

2. Between the VIN and VOUT terminals the output PMOS structure contains a diode. This diode is reverse

biased normally. If the voltage at the output terminal is forced to be higher than the voltage at the input

terminal this diode will get forward biased. This diode can withstand 1Amp of peak current and 200mA of

DC current typically.

3. Devices must be derated based on package thermal resistance at elevated temperatures.

4. VOUT(S): Specified output voltage

VOUT(E): Actual output voltage

Output voltage when fixing IOUT(=100ma) and inputting VOUT(S)+1.0V

5. Vdrop=VIN1-(VOUT3×0.98)

VOUT3 is the output voltage when VIN=VOUT(S)+1.0V and IOUT=300mA, 1000mA.

6. The output current at which the output voltage becomes 95% of VOUT(E) after gradually increasing the

output current.

7.The change in temperature [mV/°C] is calculated using the following equation.

()

1000

OUT

OUT S

OUT

ppm













 







 





 

8.The output current can be at least this value.

Due to restrictions on the package power dissipation, this value may not be satisfied. Attention should be

paid to the power dissipation of the package when the output current is large.

This specification is guaranteed by design.

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