LP2950 datasheet(3/10 Pages) CALOGIC

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LP2950 / LP2951

CORPORATION

BLOCK DIAGRAM

ERROR DETECTION

COMPARATOR

1D-21

µF

REFERENCE

1.23V

UNREGULATED DC

ERROR

AMPLIFIER

60mV

TO CMOS OR

TTL

330k

Ω

FROM

CMOS

OR TTL

5V @ 100mA

MAX

60k

Ω

LP2950 AND LP2951 BLOCK DIAGRAM

180k

Ω

SENSE

5V TAP

ERROR

GROUND

INPUT

OUTPUT

FEEDBACK

SHUTDOWN

–

CALOGIC CORPORATION, 237 Whitney Place, Fremont, California 94539, Telephone: 510-656-2900, FAX: 510-651-3025

ELECTRICAL CHARACTERISTICS (continued)

PARAMETER

LP2951

LP2950AC / LP2951AC LP2950C / LP2951C

UNITS

CONDITIONS

(Note 2)

MIN

TYP

MAX

MIN

TYP

MAX

MIN

TYP

MAX

ERROR COMPARATOR

Output Leakage Current

0.01

µAVOH = 30V

Output Low Voltage

150

250

150

250

150

250

VIN = 4.5V, IOL = 400

µA

Upper Threshold Voltage

(Note 7)

Lower Threshold Voltage

(Note 7)

Hysteresis

(Note 7)

SHUTDOWN INPUT

Input Logic Voltage

1.3

0.6

1.3

0.7

1.3

0.7

Low (Regulator ON)

High (Regulator OFF)

Shutdown Pin

Input Current

675

800

675

800

675

800

µA

VS = 2.4V

VS = 30V

Regulator Output Current

in Shutdown

310

µA

(Note 9)

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 TJ = 25

oC, 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 (VOUT = 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 LP2951 is tested at 150

oC for IL = 1mA. For IL = 100µA and TJ = 125oC, line regulation is guaranteed by design to

0.2%. See typical performance characteristics for line regulation versus temperature and load current.

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 input account.

Note 6: VREF

≤ VOUT ≤ (VIN - 1V), 2.3 ≤ VIN ≤ 30V, 100µA ≤ IL ≤ 100mA, 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 = VOUT/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 95mV x

5V/1.235 = 384mV. Thresholds remain constant as a percent of VOUT as VOUT is varied, with the dropout warning occurring at typically 5% below

nominal, 7.5% guaranteed.

Note 8: VSHUTDOWN

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

Note 9: All typical values are not guaranteed.

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