LP2950AC Advanced Monolithic Systems, LP2950AC Datasheet - Page 10

• Manufacturer Part Number: LP2950AC
• Description: 100mA LOW DROPOUT VOLTAGE REGULATOR
• Manufacturer: Advanced Monolithic Systems

APPLICATION HINTS (Continued)
*When V
and the error flag voltage rises to its pull-up voltage. Using V
as the pull-up voltage (see Figure 2), rather than an external 5V
source, will keep the error flag voltage under 1.2V (typ.) in this
condition. The user may wish to drive down the error flag
voltage using equal value resistors (10 k suggested), to ensure
a low-level logic signal during any fault condition, while still
allowing a valid high logic level during normal operation.
TYPICAL APPLICATIONS
Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone [phone] Fax [phone]
UNREGULATED
VOLTAGE
VOLTAGE
ERROR*
OUTPUT
INPUT
IN
FIGURE 1. ERROR Output Timing
INPUT
1.3V the error flag pin becomes a high impedance,
300 mA Regulator with 0.75 Dropout
4.75V
1.3V
8
6
V
IN
TAP
5V
FB
LP2951
7
GND
SENSE
OUT
4
1
2
F
k
LOAD
50mA TO
300mA
2N5432 (2)
5V OUTPUT
out
*Minimum Input-Output voltage ranges from 40mV to 400mV, depending on load
current. Current limit is typically 160 mA
*See Application Hints.
V
**Drive with TTL- high to shut down. Ground or leave if shutdown
feature is not used.
Note: Pins 2 and 6 are left open.
out
= V
REF
**SHUTDOWN
ERROR
OUPUT
INPUT
ERROR
OUPUT
SHUTDOWN
INPUT
Wide Input Voltage Range Current Limiter
(1 + R
FIGURE 2. Adjustable Regulator
1
100k
/ R
2
5
3
5
3
LP2950/LP2951
)
ERROR*
ERROR
SD
SD
GND
GND
4
4
LP2951
+V
+V
+V
+V
LP2951
IN
IN
IN
IN
8
8
FB
FB
V
V
7
7
OUT
OUT
V
1.23V
1
1
REF
*V
OUT
R
R
1
2
V
1.2
*
V
F
OUT
+
30V
3.3 F