SPX2945 datasheet(3/12 Pages) SIPEX

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Date: 3/14/06

SPX2945 400mA Low Dropout Voltage Regulator with Shutdown

PARAMETER

CONDITIONS

MIN

TYP

MAX

♦

UNITS

(Note 2)

Feedback Pin Bieas Current

0.1

nA/°C

Temperature Coefficient

Output Leakage Current

V0H=20V

0.01

µA

♦

Output Low Voltage

VIN=4.5V

150

250

I0L=400µA

400

♦

Upper Threshold Voltage

(Note 6)

Lower Threshold Voltage

(Note 6)

140

♦

Hysteresis

(Note 6)

Input Logic Voltage

Low (Regulator ON)

0.7

♦

High (Regulator OFF)

1.3

2.0

♦

Shutdown Pin Input Current

VS=2.4V

µA

100

♦

VS=26V

450

600

750

♦

Regulator Output Current

(Note 7)

µA

in Shutdown

♦

Thermal Resistance

TO-220-3

29.4

♦

Theta Junction-Ambient θJA

TO-263-3

31.4

♦

°C/W

TO-263-5

31.2

♦

NSOIC-8

128.4

♦

SOT-223

62.3

♦

TO-252

♦

ELECTRICAL CHARACTERISTICS: Continued

Electrical characteristics at V

IN = VO+1V, IO = 1mA, COUT = 2.2µF, TA = 25°C, unless otherwise specified. ♦ applies over the

full operating temperature range.

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 T

j = 25°C, VIN = 6V, IL = 1mA and CL = 2.2µF. Additional

conditions for the 8-pin versions are feedback tied to 5V/3.3V tap and output tied to output sense (V

OUT = 5V) and

SHUTDOWN ≤ 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 is tested at 150°C for I

L = 1 mA. For TJ = 125°C, line regulation is guaranteed

by design.

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: 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 7: V

SHUTDOWN ≥ 2V, VIN ≤ 26V, VOUT = 0, Feedback pin tied to 5V/3.3V Tap.

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