UNISEM US1050-33CT, US1050-33CP, US1050-33CM, US1050-33CD Datasheet

US1050-33

5A LOW DROPOUT POSITIVE

FIXED 3.3V OUTPUT REGULATOR

FEATURESFEATURES

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

Output Current Limiting
Built-in Thermal Shutdown

APPLICATIONSAPPLICATIONS

Standard 3.3V Chip-Set and Logic Applications

TYPICAL APPLICATIONTYPICAL APPLICATION

DESCRIPTIONDESCRIPTION

The US1050-33 product is a low dropout three terminal
fixed 3.3V output regulator with minimum of 5A output
current capability. This product is specifically designed
to provide well regulated supply for low voltage IC appli­cations requiring 3.3V output. The US 1050-33 is guar-

anteed to have <1.3V drop out at full load current

making it ideal to provide well regulated output with sup­ply voltage as low as 4.6V input.

5V

C1

330uF

Vin

3

Vout

Gnd

2

1

US1050-33

1050-33app1-1.1

Typical application of US1050-33

Tj (°C) 3 PIN PLASTIC 3 PIN PLASTIC 2 PIN PLASTIC 3 PIN PLASTIC
TO220 (T) TO263 (M) POWER FLEX (P) TO252 (D)

0 TO 150 US1050-33CT US1050-33CM US1050-33CP US1050-33CD

3.3V / 5A

C2
330uF

Rev. 1.1
10/27/00

2-33

US1050-33

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

3 PIN PLASTIC TO220 ( T ) 3 PIN PLASTIC TO263 ( M ) 2 PIN PLASTIC POWER FLEX ( P ) 3 PIN PLASTIC TO252 ( D )

Tab is

Vout

FRONT VIEW

FRONT VIEW

3

2

1

Vin

Vout

Gnd

Tab is

Vout

3

Vin

2

Vout

1

Gnd

Tab is

Vout

FRONT VIEW

4

3

Vin

1

Adj

θJT=2.7°C/W θJA=60°C/W θJA=35°C/W for 1" Square pad θJA=70°C/W for 1" Square pad θJA=70°C/W for 0.5" 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

Gnd

PARAMETER SYM TEST CONDITION MIN TYP MAX UNITS

Output Voltage Vo Io=10mA,Tj=25°C,Vin=5V 3.267 3.300 3.330 V

Io=10mA, Vin=5V 3.234 3.300 3.366
Line Regulation Io=10mA,4.7V<Vin<7V 0.2 %
Load Regulation (note 1) Vin=5V,Vadj=0,10mA<Io<5A 0.4 %
Dropout Voltage
(note 2) ∆VO Note 2 , Io=5A 1.1 1.3 V
Current Limit Vin=5V,dVo=100mV 5.1 A
Minimum Load Current Vin=5V 5 10 mA
(note 3)
Thermal Regulation 30 mS PULSE,Vin-Vo=3V,Io=5A 0.01 0.02 %/W
Ripple Rejection f=120HZ ,Co=25uF Tan

Io=2.5A,Vin-Vo=3V 60 70 dB
Adjust Pin Current Change Io=10mA,Vin-Vo=1.5V,Tj=25 0.2 5 uA
Temperature Stability Vin=5V,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.

2-34

Rev. 1.1

10/27/00