LT1510CS8 Linear Technology, LT1510CS8 Datasheet - Page 11

IC BATT CHARGER CONST V/I 8SOIC

LT1510CS8

Manufacturer Part Number
LT1510CS8
Description
IC BATT CHARGER CONST V/I 8SOIC
Manufacturer
Linear Technology
Datasheet

Specifications of LT1510CS8

Function
Charge Management
Battery Type
Li-Ion, NiCd, NiMH
Voltage - Supply
6.2 V ~ 28 V
Operating Temperature
0°C ~ 70°C
Mounting Type
Surface Mount
Package / Case
8-SOIC (0.154", 3.90mm Width)
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant

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Company
Part Number
Manufacturer
Quantity
Price
Part Number:
LT1510CS8
Manufacturer:
LT
Quantity:
10 000
Part Number:
LT1510CS8
Manufacturer:
LINEAR/凌特
Quantity:
20 000
Part Number:
LT1510CS8#30390
Manufacturer:
LT
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Part Number:
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Manufacturer:
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Quantity:
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APPLICATIONS
of the battery, canceling part or all of the 200 A. Note that
if net current is into the battery and the battery is removed,
the charger output voltage will float high, to near input
voltage. This could be a problem when reinserting the
battery, if the resulting output capacitor/battery surge
current is high enough to damage either the battery or the
capacitor.
If net current into the battery must be less than zero in
shutdown, there are several options. Increasing divider
current to 300 A - 400 A will ensure that net battery
current is less than zero. For long term storage conditions
however, the divider may need to be disconnected with a
MOSFET switch as shown in Figures 2 and 5. A second
option is to connect a 1N914 diode in series with the
MOSFET drain. This will limit how far the V
down, and current ( 700 A) will flow into the BAT pin, and
therefore out of the battery. This is not usually a problem
unless the charger will remain in the shutdown state with
input power applied for very long periods of time.
Removing input power to the charger will cause the BAT
pin current to drop to near zero, with only the divider
current remaining as a small drain on the battery. Even
that current can be eliminated with a switch as shown in
Figures 2 and 5.
Some battery manufacturers recommend termination of
constant-voltage float mode after charging current has
dropped below a specified level (typically 50mA to 100mA)
and a further time-out period of 30 minutes to 90 minutes
has elapsed. This may extend the life of the battery, so
check with manufacturers for details. The circuit in Figure
7 will detect when charging current has dropped below
75mA. This logic signal is used to initiate a time-out
LT1510
Figure 5. Disconnecting Voltage Divider
OVP
VN2222
U
Q3
INFORMATION
R3
12k
R4
4.99k
0.25%
U
220k
R5
W
V
IN
C
pin will be pulled
+
+
4.2V
4.2V
U
1510 F05
V
BAT
** COILTRONICS CTX33-2
* TOKIN OR MARCON CERAMIC
period, after which the LT1510 can be shut down by
pulling the V
Some external means must be used to detect the need for
additional charging if needed, or the charger may be
turned on periodically to complete a short float-voltage
cycle.
Current trip level is determined by the battery voltage, R1
through R3, and the internal LT1510 sense resistor
( 0.18 pin-to-pin). D2 generates hysteresis in the trip
level to avoid multiple comparator transitions.
Nickel-Cadmium and Nickel-Metal-Hydride Charging
The circuit in Figure 6 uses the 8-pin LT1510 to charge
NiCd or NiMH batteries up to 12V with charging currents
of 0.5A when Q1 is on and 50mA when Q1 is off.
For a 2-level charger, R1 and R2 are found from:
All battery chargers with fast-charge rates require some
means to detect full charge state in the battery to terminate
the high charging current. NiCd batteries are typically
charged at high current until temperature rise or battery
L1**
33 H
SURFACE MOUNT
I
R
0.22 F
BAT
1
C1
D2
1N914
Figure 6. Charging NiMH or NiCd Batteries
(Efficiency at 0.5A 90%)
2 465 2000
1N5819
2000 2 465
D1
C
I
R
LOW
pin low with an open collector or drain.
SW
BOOST
GND
SENSE
PROG
LT1510
PROG
BAT
V
V
CC
C
I
BAT
+
+
LT1510/LT1510-5
0.1 F
1 F
R
C
10 F
C
22 F
TANT
IN
OUT
2
300
*
1k
+
1N5819
2 465 2000
D3
100k
I
2V TO
20V
HI
R1
ADAPTER
I
LOW
WALL
ON: I
OFF: I
R2
11k
1510 F05.5
11
BAT
Q1
VN2222
BAT
= 0.5A
= 0.05A

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