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LTC4007-1 Datasheet(PDF) 6 Page - Linear Technology

Part # LTC4007-1
Description  4A, High Efficiency, Li-Ion Battery Charger
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC4007-1 Datasheet(HTML) 6 Page - Linear Technology

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LTC4007-1
40071f
PI FU CTIO S
ACP(Pin 1): Open-Drain output to indicate if the AC
adapter voltage is adequate for charging. This pin is pulled
low by an internal N-channel MOSFET if DCIN is below
BAT. A pull-up resistor is required. The pin is capable of
sinking at least 100
µA.
RT (Pin 2): Timer Resistor. The timer period is set by
placing a resistor, RRT , to GND. This resistor is always
required.
The timer period is tTIMER = (1hour • RRT/154K).
If this resistor is not present, the charger will not start.
FAULT (Pin 3): Active low open-drain output that indi-
cates charger operation has stopped due to a low-battery
conditioning error, or that charger operation is suspended
due to the thermistor exceeding allowed values. A pull-up
resistor is required if this function is used. The pin is
capable of sinking at least 100
µA.
GND (Pin 4): Ground for Low Power Circuitry.
3C4C (Pin 5): Select 3-cell or 4-cell float voltage by
connecting this pin to GND or open, respectively. Internal
14
µA pull-up to 5.3V. This pin can also be driven with
open-collector/drain logic levels. High: 4 cell. Low: 3 cell.
LOBAT (Pin 6): Low-Battery Indicator. Active low digital
output. Internal 10
µA pull-up to 3.5V. If the battery
voltage is below 3.25V/cell (or 3.173V/cell for 4.1V chem-
istry batteries) LOBAT will be low. The pin is capable of
sinking at least 100
µA. If VLOGIC is greater than 3.3V, add
an external pull-up.
NTC (Pin 7): A thermistor network is connected from NTC
to GND. This pin determines if the battery temperature is
safe for charging. The charger and timer are suspended
and the FAULT pin is driven low if the thermistor indicates
a temperature that is unsafe for charging. The thermistor
function may be disabled with a 300k to 500k resistor from
DCIN to NTC.
ITH (Pin 8): Control Signal of the Inner Loop of the Current
Mode PWM. Higher ITH voltage corresponds to higher
charging current in normal operation. A 6k resistor, in
series with a capacitor of at least 0.1
µF to GND provides
loop compensation. Typical full-scale output current is
40
µA. Nominal voltage range for this pin is 0V to 3V.
TYPICAL PERFOR A CE CHARACTERISTICS
Efficiency at 19VDC VIN
Efficiency at 12.6V with 15VDC VIN
CHARGE CURRENT (A)
1.00
0.50
1.50
2.00
2.50
3.00
40071 G10
16.8V
12.6V
100
95
90
85
80
75
CHARGE CURRENT (A)
1.00
0.50
1.50
2.00
2.50
3.00
40071 G11
100
95
90
85
80
75


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