RC2951(1997) 데이터 시트보기 (PDF) - Fairchild Semiconductor
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RC2951 Datasheet PDF : 12 Pages
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RC2951
PRODUCT SPECIFICATION
Electrical Characteristics (continued)
The • denotes that the limits apply at temperature extremes.
Parameter
Conditions1
Typ.
Tested Limit2
Units
Shutdown Input
Input Logic Voltage
Shutdown Pin Input Current
Regulator Output
Current in Shutdown6
Low (Regulator ON)
High (Regulator OFF)
Vshutdown = 2.4V
Vshutdown = 30V
1.3
•
•
30
•
450
•
3
•
V
0.6
V max
2.0
V min
50
µA max
100
µA max
600
µA max
750
µA max
10
µA max
20
µA max
Notes:
1. Unless otherwise specified all limits guaranteed for TJ - 25°C, Vin = (VONOM + 1)V, IL = 100µA and CL = 1 µF for 5V
versions, and 2.2 µF for 3V and 3.3V versions. Additional conditions for the 8-pin versions are Feedback tied to VTAP,
Output tied to Output Sense and Vshutdown < 0.8V.
2. Guaranteed and 100% production tested.
3. 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.
4. Comparator thresholds are expressed in terms of a voltage differential at the Feedback terminal below the nominal
reference voltage measured at Vin = (VONOM + 1)V. 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/1.235V = 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.
5. Vref < Vout ≤ (Vin – 1V), 2.3V ≤ Vin ≤ 30V, 100µA ≤ IL ≤ 100 mA, TJ ≤ TJMAX.
6. Vshutdown ≥ 2V, Vin ≤ 30V, Vout = 0, Feedback pin tied to VTAP.
7. Output or reference voltage temperature coefficient is defined as the worst case voltage change divided by the total
temperature range.
8. Thermal regulation is defined as the change in output voltage at a time T after a change in power dissipation is applied, ex-
cluding load or line regulation effects. Specifications are for a 50 mA load pulse at VIN = 30V (1.25W pulse) for
T = 10 ms.
9. 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.
10. Line regulation for the RC2951 is tested at 150°C for IL = 1 mA. For IL = 100 µA 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.
4
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