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LT1424-5

Isolated Flyback Switching Regulator with 5V Output

Linear Technology 

LT1424-5

ABSOLUTE MAXIMUM RATINGS

(Note 1)

Supply Voltage (VIN) ................................................ 20V

Switch Voltage (VSW) .............................................. 35V

SHDN, SYNC Pin Voltage ........................................... 7V

Operating Junction Temperature Range

Commercial .......................................... 0°C to 125°C

Industrial ......................................... – 40°C to 125°C

Storage Temperature Range ................. – 65°C to 150°C

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

PACKAGE/ORDER INFORMATION

TOP VIEW

SHDN 1

VC 2

SYNC 3

SGND 4

8 RCCOMP

7 VIN

6 VSW

5 PGND

N8 PACKAGE

8-LEAD PDIP

S8 PACKAGE

8-LEAD PLASTIC SO

ORDER PART

NUMBER

LT1424CN8-5

LT1424CS8-5

LT1424IN8-5

LT1424IS8-5

S8 PART MARKING

TJMAX = 145°C, θJA = 130°C/ W (N)

TJMAX = 145°C, θJA = 110°C/ W (S)

14245

1424I5

Consult factory for 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 = 5V, VSW Open, VC = 1.4V, unless otherwise specified.

SYMBOL

PARAMETER

CONDITIONS

MIN TYP MAX

Power Supply

VIN(MIN)

ICC

Minimum Operating Voltage

Supply Current

Shutdown Mode Supply Current

q

2.8

3.1

q

7.0

9.5

q

15

40

SHDN Pin Threshold

q 0.3

0.9

1.3

Feedback Amplifier

VREF

Reference Voltage

Measured at VSW Pin (Note 2)

5.23 5.30 5.37

q 5.18 5.30 5.42

gm

ISOURCE, ISINK

VCL

Feedback Amplifier Transconductance

Feedback Amplifier Source or Sink Current

Feedback Amplifier Clamp Voltage

Reference Voltage/Current Line Regulation

Voltage Gain

∆IC = ±10µA (Note 3)

5V ≤ VIN ≤ 18V

(Note 4)

q 400

q 30

q

1000 1600

50

80

1.9

0.01 0.04

500

Output Switch

BV

V(VSW)

ILIM

Output Switch Breakdown Voltage

Output Switch ON Voltage

Switch Current Limit

IC = 5mA

q 35

50

ISW = 1A

q

0.55 0.85

Duty Cycle = 50%, 0°C ≤ TJ ≤ 125°C

q 1.35

1.6

1.95

Duty Cycle = 50%, – 40°C ≤ TJ ≤ 125°C q 1.20

1.6

1.95

Duty Cycle = 80%

1.3

Current Amplifier

Control Pin Threshold

Duty Cycle = Minimum

0.95

1.2

1.3

q 0.85

1.2

1.4

Control Voltage to Switch Transconductance

2

UNITS

V

mA

µA

V

V

V

µmho

µA

V

%/V

V/V

V

V

A

A

A

V

V

A/V

2

sn14245 14245fs

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