LTC4006_15 Datasheet, PDF (5/20 Pages) Linear Technology – 4A, High Efficiency, Standalone Li-Ion Battery Charger

LTC4006
TYPICAL PERFOR A CE CHARACTERISTICS
Disconnect/Reconnect Battery
(Load Dump)
V_FLOAT
1V/(DIV)
3A STEP
1A STEP
1A STEP
LOAD
STATE
DISCONNECT
3A STEP
RECONNECT
LOAD CURRENT = 1A, 2A, 3A
DCIN = 20V
LTC4006-2
Efficiency at 19VDC V_IN
100
LTC4006-4
95
LTC4006-2
90
4006 G04
Battery Leakage Current vs
Battery Voltage
40
VDCIN = 0V
35
30
25
20
15
10
5
0
0
5 10 15 20 25 30
BATTERY VOLTAGE (V)
4006 G05
LTC4006-2 Efficiency with
15VDC V_IN
100
95
90
85
85
80
80
75
0.50
1.00 1.50 2.00 2.50 3.00
CHARGING CURRENT (A)
4006 G07
75
0.50
1.00 1.50 2.00 2.50 3.00
CHARGING CURRENT (A)
4006 G08
PI FU CTIO S
DCIN (Pin 1): External DC Power Source Input. Bypass
this pin with at least 0.01µF. See Applications Information
section.
CHG (Pin 2): Open-Drain Charge Status Output. When the
battery is being charged, the CHG pin is pulled low by an
internal N-channel MOSFET. When the charge current
drops below 10% of programmed current, the N-channel
MOSFET turns off and a 25µA current source is connected
from the CHG pin to GND. When the timer runs out or the
input supply is removed, the current source will be discon-
nected and the CHG pin is forced into a high impedance
state. A pull-up resistor is required. The timer function is
defeated by forcing this pin below 1V (or connecting it to
GND).
ACP/SHDN (Pin 3): Open-Drain Output used to indicate if
the AC adapter voltage is adequate for charging. Active
high digital output. Internal 10µA pull-up to 3.5V. The
charger can also be inhibited by pulling this pin below 1V.
Reset the charger by pulsing the pin low for a minimum of
0.1µs.
4006fa
5