spx2954am3-l-5-0-tr Exar Corporation, spx2954am3-l-5-0-tr Datasheet - Page 10

• Manufacturer Part Number: spx2954am3-l-5-0-tr
• Description: 250ma Low Dropout Voltage Regulator
• Manufacturer: Exar Corporation

APPLICATIONS HINTS
Figure 4. Low Battery Disconnect
Date: 12/9/05
Figure 5. Regulator with State of Charge Indicator
FOR 5.5 V
+
6V
SEALED
LEAD-
ACID
BATTERY
SOURCE
120kΩ
400kΩ
FB
SPX385
LEAD-
ACID
BATTERY
6V
39kΩ
-
+
C4
100kΩ
1.5kΩ
1%
1%
1%
1%
R
RESET
3
1kΩ
1kΩ
39kΩ
100kΩ
10kΩ
20kΩ
SPX2954, 250mA Low Dropout Voltage Regulator
5
3
1N457
ERROR
S D
______
+V
+
+
-
-
+
-
C1
C2
C3
IN
8
SPX2954
GND
4
* OPTIONAL LATCH OFF WHEN DRO POUT OCCURS. ADJUST R3 FOR C2 SWITCHING WHEN
* OUTPUTS GO LOW WHEN V
V
IN
100kΩ
100kΩ
100kΩ
IS 6.0V
SENS E
TAP
2
V
6
3
OUT
FB
10
SD
1
7
+V
<5.8V**
<6.0V**
SPX2954
<6.2V**
+
O UT
IN
DRO PS BELOW DESGNATED THRESHHOLDS
GND
+V
= 5V
1uF
4
IN
8
SENSE
V
OUT
2
1
© Copyright 2005 Sipex Corporation
+
1µF
MEMORY V+
MAIN V+
20kΩ
NI-CAD
BACKUP
BATTERY