SPX2954 datasheet(3/7 Pages) SIPEX

3 / 7 page

Rev. 3/6/03

SP2954 250mA Low Dropout Voltage Regulator

ELECTRICAL CHARACTERISTICS (Cont.) V

IN=VO+1V, IL=100µA, CL=1µF (

NOTE

2), T

A = 25°C, unless otherwise specified.

NOTE 1: Output or reference voltage temperature coefficients defined as the worst case voltage change divided

by the total temperature range.

NOTE 2: Unless otherwise specified all limits guaranteed for T

J = 25°C, VIN = 6V, IL = 100µA and CL = 1µF.

Additional conditions for the 8-pin versions are feedback tied to 5V tap and output tied to output sense

OUT = 5V) and VSHUTDOWN ≤ 0.8V.

NOTE 3: Regulation is measured at constant junction temperature, using pulse testing with a low duty cycle.

Changes in output voltage due to heating effects are covered under the specification for thermal

regulation.

NOTE 4: Line regulation for the SPX2954 is tested at I

L = 1mA.

NOTE 5: Dropout voltage is defined as the input to output differential at which the output voltage drops 100mV

below its nominal value measured at 1V differential. At very low values of programmed output voltage,

the minimum input supply voltage of 2V (2.3V over temperature) must be taken into account.

NOTE 6: V

REF ≤VOUT ≤ (VIN - 1V), 2.3 ≤VIN≤30V, 100µA≤IL≤ 250mA, TJ ≤ TJMAX.

NOTE 7: Comparator thresholds are expressed in terms of a voltage differential at the feedback terminal below

the nominal reference voltage measured at 6V input. To express these thresholds in terms of output

voltage change, multiply by the error amplifier gain = V

OUT/VREF = (R1 + R2)/R2.

For example, at a

programmed output voltage of 5V, the error output is guaranteed to go low when the output drops by 95

mV x 5V/1.235 = 384 mV. Thresholds remain constant as a percent of V

OUT as VOUT is varied, with the

dropout warning occurring at typically 5% below nominal, 7.5% guaranteed.

NOTE 8: V

SHUTDOWN ≥ 2V, VIN ≤ 30V, VOUT =0, Feedback pin tied to 5V/3.3V Tap.

SPX2954A

SPX2954

PARAMETER

CONDITIONS

MIN.

TYP.

MAX

MIN.

TYP. MAX.

UNIT

Error Comparator

Output Leakage Current

VOH = 30V

0.01

µA

Output Low Voltage

VIN = VO-0.5V,

IOL = 400µA

150

250

150

250

Upper Threshold Voltage

(NOTE 7)

Lower Threshold Voltage

(NOTE 7)

Hysteresis

(NOTE 7)

Shutdown

Input logic Voltage

Low (Regulator ON)

1.3

0.7

1.3

0.7

High (Regulator OFF)

2.0

Shutdown Input Current

VS = 2.4V

µA

VS= 30V

400

800

400

800

Regulator Output Current

(NOTE 8)

µA

in Shutdown

SPX2954 Block Diagram, 8 Lead 5V Version

INPUT

OUTPUT

UNREGULATED DC

SHUTDOWN

GROUND

ERROR

______

SENSE

TO CMOS OR

TTL

REFERENCE

ERROR DETECTION

COMPARATOR

ERROR

AMPLIFIER

1.23V

FROM

CMOS OR

TTL

60 mV

60kΩ

330kΩ

180kΩ

1µF

FEEDBACK

5V TAP

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