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LT1948

VIN Voltage ................................................................ 8V

CT Voltage.................................................................. 6V

SW1, SW2 Voltage .................................................. 36V

FB Voltage ................................................................. 3V

VON, VO2 Voltage..................................................... 30V

Operating Temperature Range (Note 2) .. – 40

°C to 85°C

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

°C

ORDER PART

NUMBER

MS8 PART

MARKING

TJMAX = 125°C, θJA = 200°C/W

Consult factory for Industrial and Military grade parts.

LTNR

LT1948EMS8

ABSOLUTE

AXI U

RATI GS

PACKAGE/ORDER I FOR ATIO

(Note 1)

ELECTRICAL CHARACTERISTICS

Note 1: Absolute Maximum Ratings are those values beyond which the life

of a device may be impaired.

Note 2: The LT1948 is guaranteed to meet performance specifications

from 0

°C to 70°C. Specifications over the –40°C to 85°C operating

The q denotes the specifications which apply over the full operating

temperature range, otherwise specifications are at TA = 25°C. VIN = 3.3V unless otherwise specified.

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

Supply Current

Not Switching

Reference Voltage

1.26

Reference Line Reg

2.7V < VIN < 8V

0.01

%/V

CT Source Current

VFB1 = 1.3V

4.5

5.5

6.5

µA

CT Voltage to Turn On Q3

1.25

1.28

1.30

FB1 Voltage to Begin CT Charge

1.17

1.20

1.23

SW1 Current Limit

(Note 3)

1.2

1.5

SW2 Current Limit

(Note 3)

0.5

0.8

SW1 Saturation Voltage

ISW1 = 800mA

350

410

SW2 Saturation Voltage

ISW2 = 300mA

250

300

Oscillator Frequency

2.4

3.2

3.6

MHz

Maximum Duty Cycle

°C ≤ TA ≤ 85°C

–40

°C ≤ TA ≤ 0°C

VO2 Pin Resistance

Measured to Ground

400

Ω

SW1, SW2 Error Amp Gain

100

V/V

SW1, SW2 Error Amp Gm

µA/V

FB1 Regulation Voltage

1.240

1.260

1.280

1.230

1.285

FB1 Line Regulation

2.7V < VIN < 8V

0.01

0.05

VO2 Regulation Voltage

VON Switch Drop

VO2 = 25V, 7mA Load from VON, CT Voltage >1.30V

200

260

SW1 Leakage Current

Switch Off, SW1 Voltage = 3.3V

0.01

µA

SW2 Leakage Current

Switch Off, SW2 Voltage = 3.3V

0.01

µA

FB1

SW1

GND

VON

VO2

SW2

VIN

TOP VIEW

MS8 PACKAGE

8-LEAD PLASTIC MSOP

temperature range are assured by design, characterization and correlation

with statistical process controls.

Note 3: Current limit guaranteed by design and/or correlation to static test.

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