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Linear Technology Electronic Components Datasheet

LT1512 Datasheet

SEPIC Constant-Current/ Constant-Voltage Battery Charger

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LT1512
SEPIC Constant-Current/
Constant-Voltage Battery Charger
Features
n Charger Input Voltage May Be Higher, Equal to or
Lower Than Battery Voltage
n Charges Any Number of Cells Up to 30V*
n 1% Voltage Accuracy for Rechargeable Lithium
Batteries
n 500kHz Switching Frequency Minimizes
Inductor Size
n 100mV Current Sense Voltage for High Efficiency
n Battery Can Be Directly Grounded
n Charging Current Easily Programmable or Shut Down
Applications
n Battery Charging of NiCd, NiMH, Lead-Acid or
Lithium Rechargeable Cells
n Precision Current Limited Power Supply
n Constant-Voltage/Constant-Current Supply
n Transducer Excitation
*Maximum Input Voltage = 40V – VBAT
Description
The LT®1512 is a 500kHz current mode switching regulator
specially configured to create a constant-current/constant-
voltage battery charger. In addition to the usual voltage
feedback node, it has a current sense feedback circuit for
accurately controlling output current of a flyback or SEPIC
(Single-Ended Primary Inductance Converter) topology
charger. These topologies allow the current sense circuit
to be ground referred and completely separated from the
battery itself, simplifying battery switching and system
grounding problems. In addition, these topologies allow
charging even when the input voltage is lower than the
battery voltage.
Maximum switch current on the LT1512 is 1.5A. This allows
battery charging currents up to 1A for a single lithium-ion
cell. Accuracy of 1% in constant-voltage mode is perfect
for lithium battery applications. Charging current can be
easily programmed for all battery types.
L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
Typical Application
WALL
ADAPTER
INPUT
+
C3
22µF
CHARGE
25V
SYNC
AND/OR
SHUTDOWN
SHUTDOWN
L1 A*
VIN VSW
C2**
D1
2.2µF MBRS130LT3
LT1512
L1 B*
S/S FB
GND GND S VC
IFB
C5
0.1µF
R4
24Ω
R5
1k
C4
0.22µF
R3
0.2Ω
R1
R2
*L1 A, L1 B ARE TWO 33µH WINDINGS ON A
SINGLE INDUCTOR: COILTRONICS CTX33-3
**TOKIN CERAMIC 1E225ZY5U-C203-F
Figure 1. SEPIC Charger with 0.5A Output Current
0.5A
+ C1
22µF
25V
1512 F01
Maximum Charging Current
1.0
SINGLE
LITHIUM
0.8 CELL (4.1V)
0.6 DOUBLE
LITHIUM
CELL (8.2V)
0.4 6V BATTERY
0.2 12V BATTERY
INDUCTOR = 33µH
0
0 5 10 15 20 25
INPUT VOLTAGE (V)
1512 TA02
ACTUAL PROGRAMMED CHARGING current will be independent of input
voltage and battery voltage if it does not exceed the values shown.
THESE ARE ELECTRICAL LIMITATIONS BASED ON MAXIMUM SWITCH CURRENT.
PACKAGE THERMAL LIMITATIONS MAY REDUCE MAXIMUM CHARGING CURRENT.
SEE APPLICATIONs INFORMATION.
1512fc
For more information www.linear.com/LT1512
1


Linear Technology Electronic Components Datasheet

LT1512 Datasheet

SEPIC Constant-Current/ Constant-Voltage Battery Charger

No Preview Available !

LT1512
Absolute Maximum Ratings
(Note 1)
Input Voltage ............................................................ 30V
Switch Voltage.......................................................... 40V
S/S Pin Voltage......................................................... 30V
FB Pin Voltage (Transient, 10ms)............................ ±10V
VFB Pin Current...................................................... 10mA
IFB Pin Voltage (Transient, 10ms) ........................... ±10V
Storage Temperature Range................... –65°C to 150°C
Ambient Temperature Range
LT1512C (Note 2)...................................... 0°C to 70°C
LT1512I................................................. –40°C to 85°C
Operating Junction Temperature Range
LT1512C (Note 2)............................... –20°C to 125°C
LT1512I............................................... –40°C to 125°C
Short Circuit.......................................... 0°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
Pin Configuration
VC 1
FB 2
IFB 3
S/S 4
TOP VIEW
8 VSW
7 GND
6 GND S
5 VIN
N8 PACKAGE
8-LEAD PDIP
S8 PACKAGE
8-LEAD PLASTIC SO
TJMAX = 125°C, qJA = 100°C/W (N)
TJMAX = 125°C, qJA = 130°C/W (S)
NOTE: CONTACT FACTORY CONCERNING 16-LEAD
FUSED-LEAD GN PACKAGE WITH LOWER THERMAL RESISTANCE
order information
LEAD FREE FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LT1512CN8#PBF
LT1512CN8#TRPBF
1512
8-Lead PDIP
0°C to 70°C
LT1512CS8#PBF
LT1512CS8#TRPBF
1512
8-Lead Plastic SO
0°C to 70°C
LT1512IN8#PBF
LT1512IN8#TRPBF
1512I
8-Lead PDIP
–40°C to 85°C
LT1512IS8#PBF
LT1512IS8#TRPBF
1512I
8-Lead Plastic SO
–40°C to 85°C
LEAD BASED FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LT1512CN8
LT1512CN8#TR
1512
8-Lead PDIP
0°C to 70°C
LT1512CS8
LT1512CS8#TR
1512
8-Lead Plastic SO
0°C to 70°C
LT1512IN8
LT1512IN8#TR
1512I
8-Lead PDIP
–40°C to 85°C
LT1512IS8
LT1512IS8#TR
1512I
8-Lead Plastic SO
–40°C to 85°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
E lectrical Characteristics The l denotes the specifications which apply over the full operating
temperature range, otherwise
unless otherwise noted.
specifications
are
at
TA
=
25°C.
VIN
=
5V,
VC
=
0.6V,
VFB
=
VREF,
IFB
=
0V,
VSW
and
S/S
pins
open,
SYMBOL PARAMETER
VREF VFB Reference Voltage
FB Input Current
FB Reference Voltage Line Regulation
CONDITIONS
Measured at FB Pin
VC = 0.8V
VFB = VREF
2.7V ≤ VIN ≤ 25V, VC = 0.8V
MIN
1.233
l 1.228
l
l
TYP
1.245
1.245
300
0.01
MAX
1.257
1.262
550
600
0.03
UNITS
V
V
nA
nA
%/V
1512fc
2 For more information www.linear.com/LT1512


Part Number LT1512
Description SEPIC Constant-Current/ Constant-Voltage Battery Charger
Maker Linear Technology
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LT1512 Datasheet PDF






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