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LT1512I Datasheet

  • LT1512I

  • Linear Technology [SEPIC Constant-Current/ Constant-Voltage...

  • 264.16KB

  • LINER

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LT1512
SEPIC Constant-Current/
Constant-Voltage
Battery Charger
FEATURES
s
s
s
DESCRIPTION
The LT
廬
1512 is a 500kHz current mode switching regula-
tor 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 sepa-
rated from the battery itself, simplifying battery switching
and system grounding problems. In addition, these to-
pologies 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 cur-
rent can be easily programmed for all battery types.
, LTC and LT are registered trademarks of Linear Technology Corporation.
s
s
s
s
Charger Input Voltage May Be Higher, Equal to or
Lower Than Battery Voltage
Charges Any Number of Cells Up to 30V*
1% Voltage Accuracy for Rechargeable Lithium
Batteries
100mV Current Sense Voltage for High Efficiency
Battery Can Be Directly Grounded
500kHz Switching Frequency Minimizes
Inductor Size
Charging Current Easily Programmable or Shut Down
APPLICATIONS
s
s
s
s
Battery Charging of NiCd, NiMH, Lead-Acid
or Lithium Rechargeable Cells
Precision Current Limited Power Supply
Constant-Voltage/Constant-Current Supply
Transducer Excitation
*Maximum Input Voltage = 40V 鈥?V
BAT
TYPICAL APPLICATION
1.0
Maximum Charging Current
SINGLE
LITHIUM
CELL (4.1V)
WALL
ADAPTER
INPUT
CHARGE
鈥?/div>
L1 A*
C2**
D1
2.2碌F MBRS130LT3
CURRENT (A)
0.8
+
C3
22碌F
25V
V
IN
LT1512
S/S
V
SW
L1 B*
FB
鈥?/div>
R4
24鈩?/div>
R3
0.2鈩?/div>
R2
R1
0.5A
0.6
SYNC
AND/OR
SHUTDOWN
SHUTDOWN
0.4
GND GND S V
C
I
FB
C5
0.1碌F
R5
1k
+
C1
22碌F
25V
0.2
C4
0.22碌F
0
0
*L1 A, L1 B ARE TWO 33碌H WINDINGS ON A
SINGLE INDUCTOR: COILTRONICS CTX33-3
**TOKIN CERAMIC 1E225ZY5U-C203-F
1512 F01
Figure 1. SEPIC Charger with 0.5A Output Current
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.
U
U
U
DOUBLE
LITHIUM
CELL (8.2V)
6V BATTERY
12V BATTERY
INDUCTOR = 33碌H
5
15
10
INPUT VOLTAGE (V)
20
25
1512 TA02
1

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