LT1948EMS8 查看數據表（PDF） - Linear Technology

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LT1948EMS8

DC/DC Converter for TFT-LCD Panels

Linear Technology 

LT1948

ABSOLUTE AXI U RATI GS

(Note 1)

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

UW U

PACKAGE/ORDER I FOR ATIO

TOP VIEW

FB1 1

CT 2

SW1 3

GND 4

8 VON

7 VO2

6 SW2

5 VIN

MS8 PACKAGE

8-LEAD PLASTIC MSOP

TJMAX = 125°C, θJA = 200°C/W

ORDER PART

NUMBER

LT1948EMS8

MS8 PART

MARKING

LTNR

Consult factory for Industrial and Military grade parts.

ELECTRICAL CHARACTERISTICS 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

Supply Current

Reference Voltage

Reference Line Reg

CT Source Current

CT Voltage to Turn On Q3

FB1 Voltage to Begin CT Charge

SW1 Current Limit

SW2 Current Limit

SW1 Saturation Voltage

SW2 Saturation Voltage

Oscillator Frequency

Maximum Duty Cycle

VO2 Pin Resistance

SW1, SW2 Error Amp Gain

SW1, SW2 Error Amp Gm

FB1 Regulation Voltage

FB1 Line Regulation

VO2 Regulation Voltage

VON Switch Drop

SW1 Leakage Current

SW2 Leakage Current

CONDITIONS

Not Switching

2.7V < VIN < 8V

VFB1 = 1.3V

(Note 3)

(Note 3)

ISW1 = 800mA

ISW2 = 300mA

0°C ≤ TA ≤ 85°C

–40°C ≤ TA ≤ 0°C

Measured to Ground

2.7V < VIN < 8V

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

Switch Off, SW1 Voltage = 3.3V

Switch Off, SW2 Voltage = 3.3V

MIN

4.5

1.25

1.17

1.2

0.5

q 2.4

70

q 69

q 67

1.240

q 1.230

22

TYP

7

1.26

0.01

5.5

1.28

1.20

1.5

0.8

350

250

3.2

75

400

100

50

1.260

0.01

23

200

0.01

0.01

MAX

13

6.5

1.30

1.23

410

300

3.6

90

1.280

1.285

0.05

24

260

5

2

UNITS

mA

V

%/V

µA

V

V

A

A

mV

mV

MHz

%

%

%

kΩ

V/V

µA/V

V

V

V

mV

µA

µA

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

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.

2

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