rc2951mt Fairchild Semiconductor, rc2951mt Datasheet - Page 4

• Manufacturer Part Number: rc2951mt
• Description: Adjustable Micropower Voltage Regulator
• Manufacturer: Fairchild Semiconductor

RC2951
Electrical Characteristics
The • denotes that the limits apply at temperature extremes.
Notes:
1. Unless otherwise specified all limits guaranteed for T
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
4. Comparator thresholds are expressed in terms of a voltage differential at the Feedback terminal below the nominal
5. V
6. V
7. Output or reference voltage temperature coefficient is defined as the worst case voltage change divided by the total
8. Thermal regulation is defined as the change in output voltage at a time T after a change in power dissipation is applied,
9. Regulation is measured at constant junction temperature, using pulse testing with a low duty cycle. Changes in output voltage
10. Line regulation for the RC2951 is tested at 150°C for I
4
Parameter
Shutdown Input
Input Logic Voltage
Shutdown Pin Input Current
Regulator Output
Current in Shutdown
versions, and 2.2 µF for 3V and 3.3V versions. Additional conditions for the 8-pin versions are Feedback tied to V
Output tied to Output Sense and V
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.
reference voltage measured at V
by the error amplifier gain = V
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 V
temperature range.
excluding load or line regulation effects. Specifications are for a 50 mA load pulse at V
T = 10 ms.
due to heating effects are covered under the specification for thermal regulation.
by design to 0.2%. See Typical Performance Characteristics for line regulation versus temperature and load current.
ref
shutdown
out
< V
as V
out
≥ 2V, V
≤ (V
out
is varied, with the dropout warning occurring at typically 5% below nominal, 7.5% guaranteed.
in
– 1V), 2.3V ≤ V
in
≤ 30V, V
6
out
out
= 0, Feedback pin tied to V
in
/V
in
Conditions
Low (Regulator ON)
High (Regulator OFF)
V
V
≤ 30V, 100µA ≤ I
= (V
shutdown
ref
shutdown
shutdown
= (R1 + R2)/R2. For example, at a programmed output voltage of 5V, the Error output
O
(continued)
NOM + 1)V. To express these thresholds in terms of output voltage change, multiply
< 0.8V.
= 2.4V
= 30V
1
L
J
≤ 100 mA, T
L
= 25°C, V
= 1 mA. For I
TAP
.
in
J
= (V
≤ T
L
= 100 µA and T
JMAX
O
•
•
•
•
•
NOM + 1)V, I
.
Typ.
450
1.3
30
3
J
L
= 125°C, line regulation is guaranteed
IN
= 100µA and C
= 30V (1.25W pulse) for
Tested Limit
100
600
750
0.6
2.0
50
10
20
PRODUCT SPECIFICATION
L
= 1 µF for 5V
2
REV. 1.0.1 4/8/02
µA max
µA max
µA max
µA max
µA max
µA max
V max
V min
Units
TAP
V
,