SPX2950 데이터 시트보기 (PDF) - Signal Processing Technologies

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SPX2950

150mA Low Dropout Voltage Regulators

Signal Processing Technologies 

SPX2950/SPX2951

PARAMETER

CONDITIONS

(Note 2)

SPX2950AC

SPX2950C

SPX2951

SPX2951AC

SPX2951C

Min

Typ

Max Min

Typ Min

Typ UNITS

Max

Max

8-Pin Version only (Continued)

Feedback Pin Bias Current

40

60

40 60

40 60

nA

Reference Voltage Temperature

Coefficient

Feedback Pin Bias Current

Temperature Coefficient

( Note 7 )

20

20

50

ppm/°C

0.1

0.1

0.1

nA/°C

Error Comparator

Output Leakage Current

Output Low Voltage

Upper Threshold Voltage

VOH = 30V

VIN = 4.5V

IOL = 400µA

(Note 8)

0.01

1

150 250

0.01 1

150 250

0.01 1

µA

150 250

mV

40

60

40

60

40

60

mV

Lower Threshold Voltage

(Note 8)

75

95

75 95

75 95

mV

Hysteresis

(Note 8)

15

15

15

mV

Shutdown Input

Input logic Voltage

Low (Regulator ON)

1.3

0.6

1.3 0.7

1.3 0.7

V

High (Regulator OFF)

2

2

2

V

Shut down Pin Input Current

VS = 2.4V

VS = 30V

30

50

675 800

30 50

675 800

30 50

µA

675 800

µA

Regulator Output Current in

Shutdown

(Note 9)

3

10

3

10

3

10

µA

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°C, VIN = 6V, IL = 100 µA and CL = 1 µF. 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 SPX2951 is tested at 150°C for IL = 1 mA. For IL = 100 µA and TJ = 125°C, 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 100 mV 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: VREF ≤VOUT ≤ (VIN - 1V), 2.3 ≤VIN≤30V, 100µA≤IL≤ 150 mA, TJ ≤ TJMAX.

Note 7: Output or reference voltage temperature coefficient is defined as the worst case voltage change divided by the total temperature range.

Note 8: 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 95 mV x 5V/1.235 = 384 mV. 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 9: VSHUTDOWN ≥ 2V, VIN ≤ 30V, VOUT =0, Feedback pin tied to 5V Tap.

Note 10: All typical values are not guaranteed. The value could vary from lot to lot.

BLOCK DIAGRAM

UNREGULATED DC

+

7

FEEDBACK

8

INPUT

1

OUTPUT

FROM

CMOS OR

TTL

3

SHUTDOWN

+

_

ERROR

AMPLIFIER

180kΩ ..

+

+

60 mV

_

+ 1.23V

60kΩ ..

ERROR

DCEOTMEPCATRIOANTOR

REFERENC

E

SPX2950 and SPX2951 Block

2

SENSE

6

5V TAP

5

______

ERROR

4

GROUND

5V @ 150mA

MAX

330kΩ ..

+

1µ F..

TO CMOS

OTTRL

Rev. 10/30/00

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