LP2953_15 datasheet(7/41 Pages) TI

7 / 41 page

LP2952-N, LP2952A, LP2953, LP2953A

www.ti.com

SNVS095F – MAY 2004 – REVISED MARCH 2015

Electrical Characteristics: All Voltage Options (continued)

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

Unless otherwise specified, MIN (minimum) and MAX (maximum) specifications in apply over the full Operating Temperature

Range and TYP (typical) values apply at TJ = 25°C, VIN = VOUT(NOM) + 1 V, IOUT = 1 mA, COUT = 2.2 μF for 5-V parts and 4.7

μF for 3.3-V parts. FEEDBACK pin is tied to VTAP pin, OUT pin is tied to SENSE pin.

LP2952AI, LP2953AI,

LP2952I, LP2953I,

LP2952AI-3.3, LP2953AI-3.3(1)

LP2952I-3.3, LP2953I-3.3

PARAMETER

TEST CONDITIONS

UNIT

MIN

TYP

MAX

MIN

TYP

MAX

Output noise

COUT = 4.7 μF

400

voltage (10 Hz

μV

COUT = 33 μF

260

to 100 kHz)

RMS

COUT = 33 μF

(7)

IOUT = 100 mA

TJ = 25°C, see

(8)

1.215

1.23

1.245

1.205

1.23

1.255

Reference

VREF

voltage

see(8),

1.205

1.255

1.19

1.27

Reference

VIN = 2.5 V to VOUT + 1 V

0.03%

0.1%

0.03%

0.2%

voltage line

VIN = VOUT(NOM)+ 1 V to 30 V

(9)

0.03%

0.2%

0.03%

0.4%

regulation

Reference

TJ = 25°C, IREF = 0 to 200 μA

0.25%

0.4%

0.25%

0.8%

voltage load

IREF = 0 to 200 μA

0.25%

0.6%

0.25%

1.0%

regulation

Reference

voltage

See(2), –40°C

≤ TJ ≤ 125°C

ppm/°C

temperature

coefficient

TJ = 25°C

Feedback pin

IB(FB)

bias current

TJ = 25°C; see

(10)

Output off

IO(SINK)

pulldown current

See (10)

DROPOUT DETECTION COMPARATOR

TJ = 25°C, VOH = 30 V

0.01

Output high

IOH

μA

leakage

VOH = 30 V

0.01

TJ = 25°C, VIN = VOUT(NOM) −

0.5 V

150

250

150

250

Output low

IOUT(COMP) = 400 μA

VOL

voltage

VIN = VOUT(NOM) − 0.5 V

150

400

150

400

IOUT(COMP) = 400 μA

TJ = 25°C, see

(11)

−80

−60

−35

−80

−60

−35

Upper threshold

VTHR(MAX)

voltage

See(11)

−95

−60

−25

−95

−60

−25

TJ = 25°C, see

(11)

−110

−85

−55

−110

−85

−55

Lower threshold

VTHR(MIN)

voltage

See(11)

−160

−85

−40

−160

−85

−40

HYST

Hysteresis

See(11)

(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 ≤ IOUT ≤ 250 mA.

(9)

Two separate tests are performed, one covering 2.5 V

≤ VIN ≤ VOUT(NOM)) + 1 V and the other test for VOUT(NOM) + 1 V ≤ VIN ≤ 30 V.

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

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

measured at VIN = VOUT(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 (see Figure 31).

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