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Linear Technology Electronic Components Datasheet

LT1513 Datasheet

SEPIC Constant- or Programmable-Current/ Constant-Voltage Battery Charger

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LT1513/LT1513-2
SEPIC Constant- or
Programmable-Current/
Constant-Voltage Battery Charger
FEATURES
s Charger Input Voltage May Be Higher, Equal to or
Lower Than Battery Voltage
s Charges Any Number of Cells Up to 20V
s 1% Voltage Accuracy for Rechargeable Lithium
Batteries
s 100mV Current Sense Voltage for High Efficiency
(LT1513)
s 0mV Current Sense Voltage for Easy Current
Programming (LT1513-2)
s Battery Can Be Directly Grounded
s 500kHz Switching Frequency Minimizes
Inductor Size
s Charging Current Easily Programmable or Shut Down
U
APPLICATIONS
s Charging of NiCd, NiMH, Lead-Acid or Lithium
Rechargeable Cells
s Precision Current Limited Power Supply
s Constant-Voltage/Constant-Current Supply
s Transducer Excitation
s Universal Input CCFL Driver
DESCRIPTION
The LT®1513 is a 500kHz current mode switching regula-
tor specially configured to create a constant- or program-
mable-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 switch-
ing and system grounding problems. In addition, these
topologies allow charging even when the input voltage is
lower than the battery voltage. The LT1513 can also drive
a CCFL Royer converter with high efficiency in floating or
grounded mode.
Maximum switch current on the LT1513 is 3A. This allows
battery charging currents up to 2A 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.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATION
WALL
ADAPTER
INPUT + C3
22µF
25V
L1A*
7
C2**
4.7µF
VIN VSW 5
D1
CHARGE
SYNC
AND/OR
SHUTDOWN SHUTDOWN
LT1513
6
S/S
GND VC
4 TAB 1
2
VFB
IFB R4
3 39
R5
270
C5
0.1µF
C4
0.22µF
L1B*
R1
R2
R3
0.08
1.25A
+ C1
22µF
25V
×2
* L1A, L1B ARE TWO 10µH WINDINGS ON A
COMMON CORE: COILTRONICS CTX10-4
LT1513 • TA01
** CERAMIC MARCON THCR40EIE475Z OR TOKIN 1E475ZY5U-C304
MBRD340 OR MBRS340T3. MBRD340 HAS 5µA TYPICAL
LEAKAGE, MBRS340T3 50µA TYPICAL
Figure 1. SEPIC Charger with 1.25A Output Current
Maximum Charging Current
2.4
2.2 SINGLE Li-Ion CELL
2.0 (4.1V)
1.8 DOUBLE Li-Ion
1.6 CELL (8.2V)
1.4
12V
1.2
16V
1.0
20V
0.8
0.6
0.4
0
BATTERY
VOLTAGE
5 10 15 20 25 30
INPUT VOLTAGE (V)
INDUCTOR = 10µH
ACTUAL PROGRAMMED CHARGING CURRENT WILL BE
INDEPENDENT OF INPUT VOLTAGE IF IT DOES NOT
EXCEED VALUES SHOWN
LT1513 • TA02
1


Linear Technology Electronic Components Datasheet

LT1513 Datasheet

SEPIC Constant- or Programmable-Current/ Constant-Voltage Battery Charger

No Preview Available !

LT1513/LT1513-2
ABSOLUTE AXI U RATI GS
Supply 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
Operating Junction Temperature Range
LT1513C ............................................... 0°C to 125°C
LT1513I ............................................ – 40°C to 125°C
Short Circuit ......................................... 0°C to 150°C
Storage Temperature Range ................ – 65°C to 150°C
Lead Temperature (Soldering, 10 sec)................. 300°C
PACKAGE/ORDER I FOR ATIO
FRONT VIEW
7
6
TAB 5
IS 4
GND 3
2
1
R PACKAGE
7-LEAD PLASTIC DD
VIN
S/S
VSW
GND
IFB
FB
VC
TJMAX = 125°C, θJA = 30°C/ W
WITH PACKAGE SOLDERED TO 0.5INCH2 COPPER
AREA OVER BACKSIDE GROUND PLANE OR INTERNAL
POWER PLANE, θJA CAN VARY FROM 20°C/W TO
> 40°C/W DEPENDING ON MOUNTING TECHNIQUE
ORDER PART
NUMBER
LT1513CR
LT1513CR-2
LT1513IR
LT1513IR-2
Consult factory for Military grade parts.
FRONT VIEW
7
6
5
4
3
2
1
VIN
S/S
VSW
GND
IFB
FB
VC
T7 PACKAGE
7-LEAD TO-220
TJMAX = 125°C, θJA = 50°C/ W, θJC = 4°C/W
ORDER PART
NUMBER
LT1513CT7-2
LT1513IT7-2
ELECTRICAL CHARACTERISTICS
VIN = 5V, VC = 0.6V, VFB = VREF, IFB = 0V, VSW and S/S pins open, unless otherwise noted.
SYMBOL PARAMETER
CONDITIONS
VREF FB Reference Voltage
FB Input Current
Measured at FB Pin
VC = 0.8V
VFB = VREF
VIREF
IFBVOS
gm
FB Reference Voltage Line Regulation
IFB Reference Voltage (LT1513)
IFB Input Current
IFB Reference Voltage Line Regulation
IFB Voltage Offset (LT1513-2) (Note 3)
IFB Input Current
VFB Source Current
Error Amplifier Transconductance
2.7V VIN 25V, VC = 0.8V
Measured at IFB Pin
VFB = 0V, VC = 0.8V
VIFB = VIREF (Note 2)
2.7V VIN 25V, VC = 0.8V
IVFB = 60µA (Note 4)
VIFB = VIREF
VIREF = – 10mV, VFB = 1.2V
IC = ±25µA
Error Amplifier Source Current
Error Amplifier Sink Current
VFB = VREF – 150mV, VC = 1.5V
VFB = VREF + 150mV, VC = 1.5V
MIN
1.233
q 1.228
q
q
– 107
q –110
q 10
q
q – 7.5
q – 200
q – 700
1100
q 700
q 120
q
TYP
1.245
1.245
300
0.01
– 100
– 100
25
0.01
2.5
– 10
– 300
1500
200
1400
MAX
1.257
1.262
550
600
0.03
– 93
– 90
35
0.05
12.5
0
– 100
1900
2300
350
2400
UNITS
V
V
nA
nA
%/ V
mV
mV
µA
%/V
mV
nA
µA
µmho
µmho
µA
µA
2


Part Number LT1513
Description SEPIC Constant- or Programmable-Current/ Constant-Voltage Battery Charger
Maker Linear Technology
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LT1513 Datasheet PDF





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