US2076

4-2

Rev. 1.3

4/26/98

ABSOLUTE MAXIMUM RATINGS

ABSOLUTE MAXIMUM RATINGS

12V Supply Voltage ............................................................. 14V

Vin Supply Voltage ..............................................................

7V

LDO Power Dissipation ....................................

Internally Limited

FB Pin Voltage........................................................

-0.3V to 5V

Storage Temperature Range .................................

-65 TO 150

Operating Junction Temperature ............................... 0 TO 150

PACKAGE INFORMATION

PACKAGE INFORMATION

7 PIN PLASTIC TO220 (T)

7 PIN PLASTIC TO263 (M)

LDO Section

PARAMETER

SYM

TEST CONDITION

MIN

TYP

MAX

UNITS

F.B Voltage Initial Accuracy

Vfb2

Tj=25

°C

1.237

1.250

1.262

V

F.B Voltage Total Variation

Vfb2

1.225

1.250

1.275

V

F.B Input Bias Current

Ifb2

Vfb2=1.25V

-1

+1

uA

Dropout Voltage (note 2)

Vout=1.25V, Io=7.5A

1.1

V

Line Regulation

Vout=1.25V,Io=10mA, 3<Vin<6V

0.2

%

Load Regulation (note 1)

Vout=1.25V, 10mA<Io<7.5A

0.5

%

Thermal Regulation

30 mS Pulse

0.01

%/W

Minimum Load Current (note 3)

10

mA

Ripple Rejection

f=120HZ ,Co=25uF Tan,Io=1A

70

dB

V12 Supply Current

Icc2

Vfb2=1V, Vfb1=1.5V, Io=7.5A

75

mA

Switching Controller Section

PARAMETER

SYM

TEST CONDITION

MIN

TYP

MAX

UNITS

F.B Voltage Initial Accuracy

Vfb1

Tj=25

°C

1.237

1.250

1.262

V

F.B Voltage Total Variation

Vfb1

1.225

1.250

1.275

V

F.B Input Bias Current

Ifb1

Vfb1=1.25V

-1

+1

uA

Min On Time

Vfb1 is sq wave with 300 ns on

800

nS

time and 2 uS off time

Min Off Time

Vfb1 is sq wave with 300 ns off

800

nS

time and 2 uS on time

V12 Supply Current

Icc1

Vfb1=1V, Vfb2=1.5V

10

mA

Maximum Duty Cycle

Dmax

Vfb1=1V

100

%

Minimum Duty Cycle

Dmin

Vfb1=1.5V

0

%

Gate Drive Rise/Fall Time

Vgate

Load=IRL3303

70

nS

F.B Hysterises

12

mV

ELECTRICAL SPECIFICATIONS

ELECTRICAL SPECIFICATIONS

Unless otherwise specified the following specification applies over,Vin=5V,V12=12V,and Tj=0 to 125

°C.Low duty

cycle pulse testing are used which keeps junction and case temperatures equal to the ambient temperature.

FRONT VIEW

1

2

3

4

5

6

7

Drv

V12

Vfb1

Gnd

Vfb2

Vout

Vin

FRONT VIEW

1

2

3

4

5

6

7

Drv

V12

Vfb1

Gnd

Vfb2

Vout

Vin