LP2954IMSLASHNOPB datasheet(6/28 Pages) TI1

6 / 28 page

LP2954, LP2954A

SNVS096E – JUNE 1999 – REVISED JULY 2016

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Electrical Characteristics (continued)

Limits are specified by production testing or correlation techniques using standard Statistical Quality Control (SQC) methods.

Unless otherwise noted: TJ = 25°C, VIN = 6 V, IL = 1 mA, CL = 2.2 μF

PARAMETER

TEST CONDITIONS

LP2954AI

LP2954I

UNIT

MIN

TYP

MAX

MIN

TYP

MAX

(6)

Thermal regulation is defined as the change in output voltage at a time T after a change in power dissipation is applied, excluding load

or line regulation effects. Specifications are for 200-mA load pulse at VIN = 20 V (3-W pulse) for T = 10 ms.

(7)

Connect a 0.1-μF capacitor from the OUT pin to the FEEDBACK pin.

(8)

VREF ≤ VOUT ≤ (VIN − 1 V), 2.3 V ≤ VIN ≤ 30 V, 100 μA ≤ IL≤ 250 mA.

(9)

Two separate tests are performed, one covering VIN = 2.5 V to VO(NOM) + 1 V and the other test for VIN = 2.5 V to VO(NOM) + 1 V to 30 V.

(10) VSHUTDOWN ≤ 1.1 V, VOUT = VO(NOM).

(11) Comparator thresholds are expressed in terms of a voltage differential at the FEEDBACK pin below the nominal reference voltage

measured at VIN = VO(NOM) + 1 V. To express these thresholds in terms of output voltage change, multiply by the error amplifier gain,

which is VOUT/VREF = (R1 + R2 ) / R2.

ILIMIT

Current limit

VO = 0 V

380

500

380

500

VO = 0 V

–40°C

≤ TJ ≤ 125°C

530

ΔVO/ΔPD

Thermal regulation

See(6)

0.05

0.2

0.05

0.2

%/W

Output noise

10 Hz to 100 kHz

IL = 100 mA, CL = 2.2 µF

400

μVRMS

IL = 100 mA, CL = 33 µF

260

IL = 100 mA, CL = 33 µF

(7)

ADDITIONAL SPECIFICATIONS FOR THE ADJUSTABLE DEVICE (LP2954AIM and LP2954IM)

VREF

Reference voltage

See(8)

1.215

1.23

1.245

1.205

1.23

1.255

See(8)

–40°C

≤ TJ ≤ 125°C

1.205

1.255

1.19

1.27

ΔVREF/

VREF

Reference voltage line

regulation

VIN= 2.5 V to VO(NOM) + 1 V

0.03%

0.1%

0.03%

0.2%

VIN= 2.5 V to VO(NOM) +1 V to

30 V(9)(8)–40°C

≤ TJ ≤ 125°C

0.2%

0.4%

ΔVREF/ΔT

Reference voltage

temperature coefficient

See(2)

–40°C

≤ TJ ≤ 125°C

ppm/°C

IB(FB)

Feedback pin bias current

–40°C

≤ TJ ≤ 125°C

IGND

Ground pin current at

shutdown(5)

VSHUTDOWN ≤ 1.1 V

105

140

105

140

μA

IO(SINK)

Output OFF pulldown

current

See(10)

–40°C

≤ TJ ≤ 125°C

DROPOUT DETECTION COMPARATOR

IOH

Output HIGH leakage

current

VOH = 30 V

0.01

µA

VOH = 30 V, –40°C ≤ TJ ≤

125°C

VOL

Output LOW voltage

VIN = VO(NOM) − 0.5 V

IO(COMP) = 400 μA

–40°C

≤ TJ ≤ 125°C

150

250

150

250

400

VTHR(MAX)

Upper threshold voltage

See(11)

–80

–60

–35

–80

–60

–35

See(11)

–40°C

≤ TJ ≤ 125°C

–95

–25

–95

–25

VTHR(MIN)

Lower threshold voltage

See(11)

–110

–85

–55

–110

–85

–55

See(11)

–40°C

≤ TJ ≤ 125°C

–160

–40

–160

–40

HYST

Hysteresis

See(11)

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