Linear Technology DC086 Demo Manual

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DESCRIPTIO
Demonstration board DC086 is a complete lithium-ion
battery charger designed for 1-, 2- or 3-cell applications
(other rechargeable battery types can also be charged, see
®
page three). The LT 1510 is used in a high efficiency
current mode step-down switching topology, capable of
providing up to 1.5A of charging current. This demo board
uses all surface mount components, resulting in a circuit
occupying approximately 1 square inch of board area with
less than 0.3 in. (7.6mm) height.
Jumpers J1 and J2, located on the demo board, are used
to select the correct charging voltage for the number of
W U
PERFOR A CE SU
PARAMETER
V
IN
Battery Voltage (V )
BAT
When Charging Terminates
Maximum Battery Charging Current
Note: Good thermal PC board layout techniques are required when operating near maximum power levels to prevent excessive junction temperatures.
Note: For 0.5% battery-voltage accuracy, replace R3 to R8 with 0.1% resistors.
*For V > 25V, C1 should be replaced with a higher voltage rating capacitor.
IN
TYPICAL PERFOR A CE CHARACTERISTICS A D BOARD PHOTO
Charging Efficiency
96
V = 15V
CC
94
V = 8.4V
BAT
92
90
88
86
84
82
80
0.3 0.5
0.1
BATTERY CHARGING CURRENT (A)
W W
ARY
CONDITIONS
V = 10V
IN
V = 15V
IN
V = 20V
IN
W U
0.9 1.1 1.3 1.5
0.7
DM086 • TPC01
DEMO MANUAL DC086
LT1510 Constant-Voltage/
Constant-Current Lithium-Ion
cells being charged (4.2V, 8.4V or 12.6V). Charging cur-
rent is programmed for 1.3A by resistor R1.
The DC input voltage must be at least 3V greater than the
output voltage. When the input voltage is removed, an
external low current MOSFET (Q1) provides a disconnect
for the output voltage divider resistors and the chip goes
into a sleep mode, draining approximately 3µA from the
battery.
, LTC and LT are registered trademarks of Linear Technology Corporation.
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Component Side Demo Board
BATTERY CHARGER
Battery Charger
+ 3V ≤ V
V
OUT IN
4.2 ±0.7%
8.4V ±0.7%
12.6V ±0.7%
1.3A ±5%
LIMITS
≤ 28V*
1