SPX2957AS Просмотр технического описания (PDF) - Signal Processing Technologies
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SPX2957AS Datasheet PDF : 9 Pages
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SPX2955/56/57
(Continued)
PARAMETER
Adjustable Versions only
Reference Voltage
Reference Voltage
CONDITIONS
(Note 2)
Over Temperature (Note 6)
Typ.
Typ.
1.235
SPX2955/57A
Min
Max
SPX2955/57A
1.210
1.260
1.200
1.270
1.185
1.285
SPX2955/57
Min Max
SPX2955/57B
1.200
1.270
1.990
1.280
1.185 1.285
UNITS
V
V
Feedback Pin Bias Current
Reference Voltage Temperature
Coefficient
Feedback Pin Bias Current
Temperature Coefficient
(Note 7)
20
40
60
NA
60
80
ppm/°C
50
nA/°C
0.1
Error Comparator
Output Leakage Current
Output Low Voltage
Upper Threshold Voltage
Lower Threshold Voltage
Hysteresis
V0H = 30V
VIN = 4.5V
I0L = 400µA
(Note 8)
(Note 8)
(Note 8)
0.01
1.00
1.00
µA
2.00
2.00
150
250
250
mV
400
400
60
40
40
mV
25
25
75
95
95
mV
140
140
15
mV
Shutdown Input
Input logic Voltage
Shut down Pin Input Current
Regulator Output Current in Shutdown
Low (Regulator ON)
High (Regulator OFF)
VS = 2.4V
VS = 30V
V
1.3
2.0
0.7
2.0
0.7
30
50
90
µA
100
150
450
600
800
750
1000
3
10
15
µA
20
25
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.
Rev. 11/21/00
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