LT1372_15 datasheet(2/12 Pages) LINER

Part #	LT1372

Description	500kHz and 1MHz High Efficiency 1.5A Switching Regulators

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Manufacturer	LINER [Linear Technology]

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LT1372/LT1377

(Note 1)

Supply Voltage ....................................................... 30V

Switch Voltage

LT1372/LT1377 .................................................. 35V

LT1372HV .......................................................... 42V

S/S Pin Voltage ....................................................... 30V

Feedback Pin Voltage (Transient, 10ms) ..............

±10V

Feedback Pin Current ........................................... 10mA

Negative Feedback Pin Voltage

(Transient, 10ms) .............................................

±10V

Operating Junction Temperature Range

Commercial ........................................ 0

°C to 125°C*

Industrial ......................................... – 40

°C to 125°C

Short Circuit ......................................... 0

°C to 150°C

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

°C to 150°C

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

°C

ORDER PART NUMBER

LT1372CN8

LT1372HVCN8

LT1372CS8

LT1372HVCS8

LT1372IN8

LT1372HVIN8

LT1372IS8

LT1372HVIS8

LT1377CS8

LT1377IS8

1

2

3

4

8

7

6

5

TOP VIEW

VC

FB

NFB

S/S

VSW

GND

GND S

VIN

N8 PACKAGE

8-LEAD PDIP

S8 PACKAGE

8-LEAD PLASTIC SO

TJMAX = 125°C, θJA = 100°C/ W (N8)

TJMAX = 125°C, θJA = 120°C/ W (S8)

S8 PART MARKING

1372

1372I

1377

1377I

1372H

1372HI

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

VREF

Reference Voltage

Measured at Feedback Pin

1.230

1.245

1.260

V

VC = 0.8V

q

1.225

1.245

1.265

V

IFB

Feedback Input Current

VFB = VREF

250

550

nA

q

900

nA

Reference Voltage Line Regulation

2.7V

≤ VIN ≤ 25V, VC = 0.8V

q

0.01

0.03

%/V

VNFB

Negative Feedback Reference Voltage

Measured at Negative Feedback Pin

– 2.540

– 2.490

– 2.440

V

Feedback Pin Open, VC = 0.8V

q

– 2.570

– 2.490

– 2.410

V

INFB

Negative Feedback Input Current

VNFB = VNFR

q

–45

– 30

– 15

µA

Negative Feedback Reference Voltage

2.7V

≤ VIN ≤ 25V, VC = 0.8V

q

0.01

0.05

%/V

Line Regulation

gm

Error Amplifier Transconductance

∆IC = ±25µA

1100

1500

1900

µmho

q

700

2300

µmho

Error Amplifier Source Current

VFB = VREF – 150mV, VC = 1.5V

q

120

200

350

µA

Error Amplifier Sink Current

VFB = VREF + 150mV, VC = 1.5V

q

1400

2400

µA

Error Amplifier Clamp Voltage

High Clamp, VFB = 1V

1.70

1.95

2.30

V

Low Clamp, VFB = 1.5V

0.25

0.40

0.52

V

AV

Error Amplifier Voltage Gain

500

V/ V

VC Pin Threshold

Duty Cycle = 0%

0.8

1

1.25

V

f

Switching Frequency

2.7V

≤ VIN ≤ 25V

LT1372

450

500

550

kHz

0

°C ≤ TJ ≤ 125°C

q

430

500

580

kHz

– 40

°C ≤ TJ < 0°C (I Grade)

400

580

kHz

LT1377

0.90

1

1.10

MHz

0

°C ≤ TJ ≤ 125°C

q

0.86

1

1.16

MHz

– 40

°C ≤ TJ < 0°C (I Grade)

0.80

1.16

MHz

The q denotes specifcatons which appy over the full operating temperature range, otherwise specifications are at TA = 25°C.

VIN = 5V, VC = 0.6V, VFB = VREF, VSW, S/S and NFB pins open, unless otherwise noted.

Consult factory for parts specified with wider operating temperature ranges.

*Units shipped prior to Date Code 9552 are rated at 100

°C maximum

operating temperature.

ABSOLUTE

AXI U

RATI GS

PACKAGE/ORDER I FOR ATIO

ELECTRICAL CHARACTERISTICS

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