SPX2954AM3-3.3(2003) Просмотр технического описания (PDF) - Signal Processing Technologies
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SPX2954AM3-3.3 Datasheet PDF : 17 Pages
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ELECTRICAL CHARACTERISTICS (Cont.) VIN=VO+1V, IL=100µA, CL=1µF (NOTE 2), TA = 25°C, unless otherwise specified.
SPX2954A
SPX2954
PARAMETER
CONDITIONS
MIN. TYP. MAX MIN. TYP. MAX. UNIT
Error Comparator
Output Leakage Current
Output Low Voltage
Upper Threshold Voltage
VOH = 30V
VIN = VO-0.5V,
IOL = 400µA
(NOTE 7)
0.01 1
0.01 1
µA
150 250
150 250
mV
40 60
40 60
mV
Lower Threshold Voltage (NOTE 7)
75 95
75 95
mV
Hysteresis
(NOTE 7)
15
15
mV
Shutdown
Input logic Voltage
Low (Regulator ON)
1.3 0.7
1.3 0.7
V
High (Regulator OFF) 2.0
2.0
Shutdown Input Current VS = 2.4V
VS= 30V
30 50
400 800
30 50
µA
400 800
Regulator Output Current (NOTE 8)
in Shutdown
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 = 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 SPX2954 is tested at IL = 1mA.
NOTE 5: Dropout voltage is defined as the input to output differential at which the output voltage drops 100mV
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≤ 250mA, 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/3.3V Tap.
UNREGULATED DC
+
7
FEEDBACK
8
INPUT
1
OUTPUT
FROM
CMOS OR
TTL
3
SHUTDOWN
+
_
ERROR
AMPLIFIER
180kΩ
60 mV
+
+ 1.23V
60kΩ
+
_
ERROR DETECTION
COMPARATOR
REFERENCE
2
SENSE
6
5V TAP
5
______
ERROR
4
GROUND
5V
330kΩ
+
1µF
.
.
TO CMOS OR
TTL
SPX2954 Block Diagram, 8 Lead 5V Version
Rev. 3/6/03
SP2954 250mA Low Dropout Voltage Regulator
3
© Copyright 2003 Sipex Corporation
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