LT3045 datasheet(6/44 Pages) AD

6 / 44 page

Data Sheet

LT83401/LT83402

analog.com

Rev. 0

6 of 44

(TJ = -40°C to +150°C, unless otherwise noted. Typical values are at TA = +25°C. All voltages are referenced to GND,

unless otherwise noted.)

PARAMETER

SYMBOL

CONDITIONS/COMMENTS

MIN

TYP

MAX

UNITS

Minimum Off-Time

tOFF(MIN)

ILOAD = 0.5A, LT83401

ILOAD = 1A, LT83402

100

Top Power N-Channel

MOSFET Current Limit

IPEAK-LIMIT

LT83401

1.96

2.2

2.44

LT83402

3.4

4.0

4.4

Bottom Power

N-Channel MOSFET

Current Limit

IVALLEY-LIMIT

LT83401

1.28

1.5

1.72

LT83402

1.95

2.4

2.85

SW Leakage Current

ISW_LKG

VIN = 42V, VSW = 0V, 42V, TA = +25°C

-1

μA

Power MOSFET

On-Resistance

Main Switch (Top)

RDS-ONH

280

mΩ

Power MOSFET

On-Resistance

Synchronous Switch

(Bottom)

RDS-ONL

135

mΩ

SET Pull-Down

Resistance

RSET-PULLDOWN VSET = 0.5V

540

865

EN/UVLO Threshold

VENR

EN/UVLO rising

0.7

0.75

0.8

EN/UVLO Hysteresis

VEN_HYS

EN/UVLO Input Current

IEN

VEN/UVLO = 2V, TA = +25°C

-40

+40

Not subject to production test.

The start-up time is defined as the time it takes from the EN/UVLO pin rising above the EN/UVLO threshold to

when VOUT has reached 95% of its final value.

OUTS ties directly to VOUT.

Adding a capacitor across the SET pin resistor decreases output voltage noise. Adding this capacitor bypasses

the SET pin resistor’s thermal noise as well as the reference current’s noise. Use of a SET pin bypass capacitor

also increases start-up time.

The LT83401/LT83402 is tested in a feedback loop that servos VC to a specified voltage and measures the

resultant VOUTS.

The PNP-based input pair is active for the error amplifier as long as VIN is at least 1.4V above VSET. As VIN drops to

less than 1.4V above VSET, the part gradually transitions to operating with the NPN-based input pair active.

Thermal Resistance (θ) values determined per JEDEC 51-7, 51-12. For information on improving the thermal

resistance and for actual temperature measurements of a demo board in typical operating conditions, see the

Applications Information section.

This IC includes overtemperature protection that is intended to protect the device during overload conditions.

Junction temperature exceeds 150°C when overtemperature protection is active. Continuous operation above

the specified maximum operating junction temperature reduces lifetime.

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