LT1246/LT1247

2

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Reference Section

Output Voltage

4.925

5.000

5.075

V

Line Regulation

q

320

mV

Load Regulation

q

–6

– 25

mV

Temperature Stability

0.1

mV/

°C

Total Output Variation

Line, Load, Temperature

q

4.87

5.13

V

Output Noise Voltage

µV

Long-Term Stability

5

25

mV

Output Short-Circuit Current

q

–30

– 90

–180

mA

Oscillator Section

Initial Accuracy

47.5

50

52.5

kHz

465

500

535

kHz

Voltage Stability

%

Temperature Stability

– 0.05

%/

°C

Amplitude

Pin 4

1.7

V

Clock Ramp Reset Current

7.9

8.2

8.5

mA

Error Amplifier Section

Feedback Pin Input Voltage

q

2.42

2.50

2.58

V

Input Bias Current

q

–2

µA

Open-Loop Voltage Gain

q

65

90

dB

Unity-Gain Bandwidth

1

2

MHz

Power Supply Rejection Ratio

q

60

dB

Output Sink Current

q

26

mA

Output Source Current

q

– 0.5

– 0.75

mA

(Notes 1, 2)

ELECTRICAL C

C

HARA TERISTICS

PACKAGE/ORDER I FOR ATIO

A

G

A

U

A

R

BSOLUTEXI

TI

S

Supply Voltage ....................................................... 25V

Output Current ......................................................

±1A*

Output Energy (Capacitive Load per Cycle) ............. 5

µJ

Analog Inputs (Pins 2, 3) .............................. – 0.3 to 6V

Error Amplifier Output Sink Current ..................... 10mA

Operating Junction Temperature Range

LT1246C/LT1247C ............................. 0

°C to 100°C

Storage Temperature Range ................ – 65

°C to 150°C

Lead Temperature (Soldering, 10 sec)................. 300

°C

*The 1A rating for output current is based on transient switching

requirements.

S8 PART MARKING

LT1246CN8

LT1246CS8

LT1247CN8

LT1247CS8

ORDER PART

NUMBER

1246

1247

Consult factory for Industrial and Military grade parts.

1

2

3

4

8

7

6

5

TOP VIEW

COMP

FB

OUTPUT

GND

N8 PACKAGE

8-LEAD PDIP

S8 PACKAGE

8-LEAD PLASTIC SO