2945M3 Просмотр технического описания (PDF) - Signal Processing Technologies
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2945M3 Datasheet PDF : 11 Pages
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ELECTRICAL CHARACTERISTICS: Continued
Electrical characteristics at VIN = VO+1V, IO = 1mA, COUT = 2.2µF, TA = 25°C, unless otherwise specified. ♦ applies over the
full operating temperature range.
PARAMETER
CONDITIONS
(Note 2)
MIN
TYP
MAX
♦
UNITS
Feedback Pin Bieas Current
Temperature Coefficient
0.1
nA/°C
Output Leakage Current
V0H=20V
0.01
1
2
µA
♦
Output Low Voltage
Upper Threshold Voltage
VIN=4.5V
I0L=400µA
(Note 6)
150
250
mV
400
♦
40
60
mV
25
Lower Threshold Voltage
Hysteresis
(Note 6)
(Note 6)
75
95
mV
140
♦
15
mV
Input Logic Voltage
Low (Regulator ON)
High (Regulator OFF)
0.7
♦
V
1.3
2.0
♦
Shutdown Pin Input Current
VS=2.4V
30
50
µA
100
♦
VS=26V
450 600
750
♦
Regulator Output Current
in Shutdown
(Note 7)
10
3
20
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 = 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 (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 is tested at 150°C for IL = 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 = 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 7: VSHUTDOWN ≥ 2V, VIN ≤ 26V, VOUT = 0, Feedback pin tied to 5V/3.3V Tap.
Rev. B Date:01/20/04
SPX2945 400mA Low Dropout Voltage Regulator with Shutdown
3
©Copyright 2004 Sipex Corporation
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