LT1512IS8#TR Linear Technology, LT1512IS8#TR Datasheet - Page 12
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LT1512IS8#TR
Manufacturer Part Number
LT1512IS8#TR
Description
IC CHARGER BATT CONST V/I 8SOIC
Manufacturer
Linear Technology
Datasheet
1.LT1512CN8PBF.pdf
(12 pages)
Specifications of LT1512IS8#TR
Function
Charge Management
Battery Type
All Battery Types
Voltage - Supply
2.7 V ~ 25 V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
8-SOIC (0.154", 3.90mm Width)
Output Current
1A
Output Voltage
30V
Operating Supply Voltage (min)
2.7V
Operating Supply Voltage (max)
25V
Operating Temp Range
-40C to 85C
Package Type
SOIC N
Mounting
Surface Mount
Pin Count
8
Operating Temperature Classification
Industrial
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
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
(408) 432-1900
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: (408) 434-0507
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