LT3045 datasheet(6/45 Pages) AD

6 / 45 page

Data Sheet

LT83201

analog.com

Rev. A 6 of 45

(TJ = −40°C to +125°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

Power MOSFET

On-Resistance

Synchronous Switch

(Bottom)

RDS-ONL

154

mΩ

Hiccup Timer

tHICC

TA = +25°C

1.7

EN/UVLO Threshold

VENR

EN/UVLO Rising

0.7

0.75

0.8

EN/UVLO Hysteresis

VEN_HYS

EN Delay Timer1,9

tEN_DELAY

VIN = 12V, CVCC = 1µF, RC = 1.24kΩ, CC =

4.7nF, CSET = 1μF

114

μs

EN/UVLO Input Current

IEN

VEN/UVLO = 2V, TA = +25°C

−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 90% of 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 LT83201 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 temperature when overtemperature protection is active. Continuous

operation above the specified maximum operating junction temperature reduces lifetime.

EN Delay Timer is the time from EN/UVLO high to first switching cycle.

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