SPX2955 datasheet(3/9 Pages) SIPEX

3 / 9 page

Rev. 11/21/00

SPX2955/56/57

(Continued)

PARAMETER

CONDITIONS

(Note 2)

Typ.

SPX2955/57A

Min

Max

SPX2955/57

Min

Max

UNITS

Adjustable Versions only

Typ.

SPX2955/57A

SPX2955/57B

Reference Voltage

1.235

1.210

1.200

1.260

1.270

1.200

1.990

1.270

1.280

Reference Voltage

Over Temperature (Note 6)

1.185

1.285

1.185

1.285

Feedback Pin Bias Current

Reference Voltage Temperature

Coefficient

(Note 7)

ppm/°C

Feedback Pin Bias Current

Temperature Coefficient

0.1

nA/°C

Error Comparator

Output Leakage Current

V0H = 30V

0.01

1.00

2.00

1.00

2.00

µA

Output Low Voltage

VIN = 4.5V

I0L = 400

µA

150

250

400

250

400

Upper Threshold Voltage

(Note 8)

Lower Threshold Voltage

(Note 8)

140

Hysteresis

(Note 8)

Shutdown Input

Input logic Voltage

Low (Regulator ON)

High (Regulator OFF)

1.3

2.0

0.7

2.0

0.7

Shut down Pin Input Current

VS = 2.4V

VS = 30V

450

100

600

750

150

800

1000

µA

Regulator Output Current in Shutdown

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 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 SPX2955/56/57 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.

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