UNISEM US1010CY, US1010CS, US1010CP, US1010CD Datasheet

FEATURESFEATURES

D1

Guaranteed < 1.3V Dropout at Full Load
Current
Fast Transient Response
1% Voltage Reference Initial Accuracy

Built-in Thermal Shutdown

Available in SOT-223, D-PAK , Power Flex
and 8 pin SOIC Surface Mount Packages

APPLICATIONSAPPLICATIONS

VGA & Sound Card Applications
Low Voltage High Speed Termination Applications
Standard 3.3V Chip-Set and Logic Applications

US1010

1A LOW DROPOUT POSITIVE

ADJUSTABLE REGULATOR

PRELIMINARY DATASHEET

DESCRIPTIONDESCRIPTION

The US1010 is a low dropout three terminal adjustable
regulator with minimum of 1A output current capability.
This product is specifically designed to provide well regu­lated supply for low voltage IC applications such as high

speed bus termination and low current 3.3V logic
supply. The US1010 is also well suited for other appli-
cations such as VGA and sound cards. The US 1010 is
guaranteed to have <1.3V drop out at full load cur­rent making it ideal to provide well regulated outputs of

2.5V to 3.6V with 4.75V to 7V input supply.

TYPICAL APPLICATIONTYPICAL APPLICATION

5V

C1

10uF

Vin

3

US1010

Vout

2

Adj

1

1010app1-1.4

Typical Application of US1010 in a 5V to 2.85V SCSI termination regulator .

PACKAGE ORDER INFORMATIONPACKAGE ORDER INFORMATION

R1
121

R2
154

2.85V / 1A

C2
22uF

Tj (°C) 2 PIN PLASTIC 3 PIN PLASTIC 2 PIN PLASTIC 8 PIN PLASTIC
TO252 (D) SOT223 (Y) POWER FLEX (P) SOIC (S)

0 TO 150 US1010CD US1010CY US1010CP US1010CS

Rev. 1.3
10/30/00

2-1

US1010

ABSOLUTE MAXIMUM RATINGSABSOLUTE MAXIMUM RATINGS

Input Voltage (Vin) .................................................................. 7V

Power Dissipation ............................................ Internally Limited

Storage Temperature Range .............................. -65°C TO 150°C

Operating Junction Temperature Range .................. 0°C TO 150°C

PACKAGE INFORMATIONPACKAGE INFORMATION

2 PIN PLASTIC TO252 ( D ) 3 PIN PLASTIC SOT223 ( Y ) 2 PIN PLASTIC PFLEX ( P ) 8 PIN PLASTIC SOIC (S)

Tab is

Vout

FRONT VIEW

4

3

Vin

Tab is

1

Adj

Vout

TOP VIEW

3

Vin

2

Vout

1

Adj

θJA=70°C/W for 0.5" Sq pad θJA=90°C/W for 0.4" Sq pad θJA=70°C/W for 0.5" Sq pad θJA=55°C/W for 1" Sq pad

ELECTRICAL SPECIFICATIONSELECTRICAL SPECIFICATIONS

Unless otherwise specified, these specifications apply over, Cin=1uF, Cout=10uF, and Tj=0 to 150°C.Typical
values refer to Tj=25°C.

Tab is

Vout

FRONT VIEW

4

3

Vin

1

Adj

Vin
NC
NC

TOP VIEW
1
2
3
4

8

Vout

7

Vout

6

Vout

5

VoutAdj

PARAMETER SYM TEST CONDITION MIN TYP MAX UNITS

Reference Voltage VREF Io=10mA,Tj=25°C,(Vin-Vo)=1.5V 1.243 1.250 1.257 V

Io=10mA, (Vin-Vo)=1.5V 1.237 1.250 1.263
Line Regulation Io=10mA,1.3V<(Vin-Vo)<7V 0.2 %
Load Regulation (note 1) Vin=3.3V,Vadj=0,10mA<Io<1A 0.4 %
Dropout Voltage
(note 2) ∆VO Note 2 , Io=1A 1.1 1.3 V
Current Limit Vin=3.3V,dVo=100mV 1.1 A
Minimum Load Current Vin=3.3V,Vadj=0V 5 10 mA
(note 3)
Thermal Regulation 30 mS PULSE,Vin-Vo=3V,Io=1A 0.01 0.02 %/W
Ripple Rejection f=120HZ ,Co=25uF Tan

Io=0.5A,Vin-Vo=3V 60 70 dB

Adjust Pin Current IADJ Io=10mA,Vin-Vo=1.5V,Tj=25

Io=10mA,Vin-Vo=1.5V 55 120 uA
Adjust Pin Current Change Io=10mA,Vin-Vo=1.5V,Tj=25 0.2 5 uA
Temperature Stability Vin=3.3V,Vadj=0V,Io=10mA 0.5 %

Long Term Stability Tj=125°C,1000 Hrs 0.3 1 %
RMS Output Noise Tj=25°C 10hz<f<10khz 0.003 %Vo

Note 1 : Low duty cycle pulse testing with Kelvin con­nections are required in order to maintain accurate data.
Note 2 : Drop-out voltage is defined as the minimum
differential voltage between Vin and Vout required to main­tain regulation at Vout. It is measured when the output

Note 3 : Minimum load current is defined as the mini­mum current required at the output in order for the out­put voltage to maintain regulation. Typically the resistor
dividers are selected such that it automatically main­tains this current.

voltage drops 1% below its nominal value.

2-2

Rev. 1.3

10/30/00