SPX2954 Просмотр технического описания (PDF) - Unspecified
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SPX2954 Datasheet PDF : 15 Pages
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SPX2954
Parameter
Conditions
SPX2954A
Min Typ Max
SPX2954
Min Typ Max
Units
Error Comparator
Output Leakage Current
Output Low Voltage
Upper Threshold Voltage(7)
Lower Threshold Voltage(7)
Hystersis(7)
Shutdown
Input Logic Voltage
Shutdown Input Current
Regulator Output Current in
Shutdown(8)
Thermal Resistance ѲJA
SOIC-8
SOT-223
VOH = 30V
VIN = VO - 0.5V; IOL = 400µA
Low (Regulator ON)
High (Regulator OFF)
VS = 2.4V
VS = 30V
0.01
1
0.01
1
µA
150 250
150
250
mA
40
60
40
60
mA
75
95
75
95
mV
15
15
mV
1.3 0.7
1.3
0.7
V
2.0
2.0
30
50
400 800
30
50
µA
400
800
3
10
3
10
µA
128.4
62.3
°C/W
°C/W
NOTES:
1. Output or reference voltage temperature coefficients defined as the worst case voltage change divided by the total temperature range.
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.
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.
4. Line regulation for the SPX2954 is tested at IL = 1mA.
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.
6. VREF ≤ VOUT ≤ (VIN - 1V), 2.3 ≤ VIN ≤ 30V, 100µA ≤ IL ≤ 250mA, TJ ≤ TJMAX.
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 95mV x 5V/1.235 = 384mV. 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.
8. VSHUTDOWN ≥ 2V, VIN ≤ 30V, VOUT = 0, Feedback pin tied to 5V/3.3V Tap.
Pin Configurations
SOT-223 Package (M3)
SPX2954
1
2
3
V GND V
IN
OUT
Front View
SOT-223 Package (M3)
8-Pin Surface Mount (S)
OUTPUT 1
8
INPUT
SENSE
SHUTDOWN
2
7
SPX2954
3
6
FEEDBACK
5V, 3.3V TA P
GND 4
5
ERROR
Top View
REV1A
8-Pin Surface Mount (S)
4/15
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