LT1512CN8#PBF Linear Technology, LT1512CN8#PBF Datasheet - Page 12

• Manufacturer Part Number: LT1512CN8#PBF
• Description: IC BATT CHRGR CONST I/V 8-DIP
• Manufacturer: Linear Technology

Specifications of LT1512CN8#PBF

• Function: Charge Management
• Battery Type: All Battery Types
• Voltage - Supply: 2.7 V ~ 25 V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Through Hole
• Package / Case: 8-DIP (0.300", 7.62mm)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

LT1512
TYPICAL APPLICATION
The circuit in Figure 6 will provide adapter current limit-
ing to ensure that the battery charger never overloads
the adapter. In addition, it adjusts charging current to a
lower value if other system power increases to the point
where the adapter would be overloaded. This allows the
RELATED PARTS
PART NUMBER DESCRIPTION
LT1239
LTC
LT1510
LT1511
LT1513
12
®
1325
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone]
ADAPTER
Backup Battery Management System
Microprocessor Controlled Battery Management System
1.5A Constant-Current/Constant-Voltage Battery Charger
3.0A Constant-Current/Constant-Voltage Battery Charger
with Input Current Limiting
SEPIC Constant-Current/Constant-Voltage Battery Charger
INPUT
WALL
**
*
L1 A, L1 B ARE TWO 33mH WINDINGS ON A
COMMON CORE: COILTRONICS CTX33-3
TOKIN CERAMIC 1E225ZY5U-C203-F
●
FAX: [phone]
R5
1k
R7
12k
Q1
2N3904
7
0.2Ω
4
R6
–
2
LM301
6
1N4148
+
8
●
3
D2
www.linear.com
Figure 6. Adding Adapter Current Limiting
1
30pF
TO FB PIN
SHUTDOWN
+
AND/OR
SYNC
C3
22μF
25V
SYSTEM
POWER
4
GND GND S
S/S
7
COMMENTS
Charges Backup Battery and Regulates Backup Battery Output when
Main Battery Removed
Can Charge, Discharge and Gas Gauge NiCd, NiMH and Pb-Acid Batteries
with Software Charging Profi les
Step-Down Charger for Li-Ion, NiCd and NiMH
Step-Down Charger that Allows Charging During Computer Operation and
Prevents Wall-Adapter Overload
Step-Up/Step-Down Charger for Up to 2A Current
LT1512 to charge the battery at the maximum possible
rate without concern about varying system power levels.
The LM301 op amp used here is unusual in that it can
operate with its inputs at a voltage equal to the positive
supply voltage.
6
LT1512
V
V
IN
C
5
1
C5
0.1μF
•
V
I
L1 A*
FB
SW
FB
3
C4
0.22μF
8
2
24Ω
R4
2.2μF
C2**
MBRS130LT3
•
R3
0.2Ω
L1 B*
© LINEAR TECHNOLOGY CORPORATION 2008
D1
R1
R2
0.5A
+
LT 0109 REV A • PRINTED IN USA
1512 F06
C1
22μF
25V
1512fa