LP2950AZ View Datasheet(PDF) - Bay Linear
Part Name
Description
Manufacturer
LP2950AZ Datasheet PDF : 12 Pages
| |||
LP2950/LP2951
Parameter
Shutdown Input
Input Logic Voltage
Shutdown Pin Input Current
Regulator Output Current
in Shutdown
Conditions
Low (Regulator ON)
High (Regulator OFF)
VS = 5V
VS =30V
(Note 9)
VOUT = 5.0V
3.3V ≤ VOUT ≤ 5.0V
2.0V ≤ VOUT ≤ 3.3V
MIN
2
TYP
1.3
30
450
3
MAX
0.7
50
600
10
20
30
UNIT
V
µA
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 = VO +1V, IL = 100µA and CL = 1µF. Additional conditions for the 8-
pin versions are feedback tied to –XX Voltage tap and output tied to output Sense pin ( VOUT = XX V) 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 specification for thermal regulation.
Note 4: Line regulation for LP2951-XX is tested at 150°C for IL = 1mA. 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 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), 2.3V ≤ VIN ≤ 30V, 100µA ≤ IL ≤100mA, TJ ≤ TJMAX
Note 7: Output or reference voltage temperature coefficient is defined as the worst case voltage change divided by the total temperature range
Note 8: Comparator thresholds are expressed in terms of a voltage differential at the feedback terminal below the nominal reference voltage
measured at VO + 1V 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 / 1.235V = 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.
Note 9: VSHUTDOWN ≥ 2V, VIN ≤ 30V, VOUT = 0, Feed-back pin tied to –XX Voltage Tap.
Block Diagram
UNREGULATED DC
+
7
FEEDBACK
8
INPUT
1
OUTPUT
FROM
CMOS OR
TTL
3
SHUTDOWN
+
_
ERROR
AMPLIFIER
180k Ω ..
60k Ω ..
+
+
60 mV
_
ERROR DETECTION
+ 1.23V
COMPARATOR
REFERENCE
LP2950 and LP2951 Block Diagram
2
SENSE
6
5V TAP
5
______
ERROR
4
GROUND
5V @ 150mA
MAX
330k Ω ..
+
1 µ F..
TO CMOS OR
TTL
Bay Linear, Inc 2478 Armstrong Street, Livermore, CA 94550 Tel: (925) 989-7144, Fax: (925) 940-9556
www.baylinear.com
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