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SPX2945M3

500mA Low Drop Out Voltage Regulator with Shutdown

Signal Processing Technologies 

SPX2945/46/47

(Continued)

PARAMETER

Output Leakage Current

Output Low Voltage

Upper Threshold Voltage

Lower Threshold Voltage

Hysteresis

CONDITIONS

(Note 2)

V0H = 30V

VIN = 4.5V

I0L = 400µA

(Note 8)

(Note 8)

(Note 8)

SPX2945/46/47

UNITS

Typ.

Min

Max

0.01

1.00

µA

2.00

150

250

mV

400

60

40

mV

25

75

95

mV

140

15

mV

Input logic Voltage

Shut down Pin Input Current

Low (Regulator ON)

High (Regulator OFF)

VS = 2.4V

VS = 30V

Regulator Output Current in Shutdown

0.7

V

1.3

2.0

30

50

µA

100

450

600

750

3

10

µA

20

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 are guaranteed for Tj = 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 (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 SPX2945/46/47 is tested at 150°C for IL = 1 mA. For IL = 100µA 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≤ 250 mA, 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 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 8: VSHUTDOWN ≥ 2V, VIN ≤ 30V, VOUT =0, Feedback pin tied to 5V Tap.

Note 9: The junction -to-ambient thermal resistance of the TO-92 package is 180°C/ W with 0.4” leads and 160°C/ W with 0.25” leads to a PC board.

The thermal resistance of the 8-Pin DIP package is 105°C/W junction-to-ambient when soldered directly to a PC board. Junction-to-ambient thermal resistance for the

SOIC (S) package is 160°C/W.

UNREGULATED DC

7

+

FEEDBACK

8

INPUT

1

OUTPUT

FROM

CMOS OR

TTL

3

SHUTDOWN

+

_ ERROR

AMPLIFIER

180k Ω ..

+

+

60 mV

_

+ 1.23V

60k Ω ..

ERROR DETECTION

COMPARATOR

REFERENCE

SPX2945/46/47 Block Diagram

2

SENSE

6

5V TAP

5

______

ERROR

4

GROUND

5V @ 500mA

MAX

330k Ω ..

+

1µF

TO CMOS OR

TTL

Rev. 10/25/00

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