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LTC4068-4.2 Datasheet(PDF) 5 Page - Linear Technology

Part # LTC4068-4.2
Description  Standalone Linear Li-Ion Battery Charger with Programmable Termination
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC4068-4.2 Datasheet(HTML) 5 Page - Linear Technology

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LTC4068-4.2/LTC4068X-4.2
406842fa
TYPICAL PERFOR A CE CHARACTERISTICS
Charge Current vs Supply Voltage
Charge Current
vs Ambient Temperature
Recharge Threshold Voltage
vs Temperature
Power FET “ON” Resistance
vs Temperature
VCC (V)
4
0
100
200
300
400
600
4.5
5
5.5
6
405842 G13
6.5
7
500
VBAT = 4V
TA = 25°C
θJA = 40°C/W
RPROG = 2k
RPROG = 10k
TEMPERATURE (°C)
–50
400
500
600
25
75
405842 G14
300
200
–25
0
50
100
125
100
0
VCC = 5V
VBAT = 4V
θJA = 40°C/W
RPROG = 2k
ONSET OF THERMAL REGULATION
RPROG = 10k
TEMPERATURE (°C)
–50
4.04
4.06
4.08
4.10
4.12
4.16
–25
025
50
405842 G15
75
100
4.14
VCC = 5V
RPROG = 10k
TEMPERATURE (°C)
–50
700
650
600
550
500
450
400
350
–25
025
50
405842 G17
75
125
100
VCC = 4.2V
IBAT = 100mA
RPROG = 2k
PI FU CTIO S
ITERM (Pin 1): Charge Termination Program. The charge
termination current threshold current is programmed by
connecting a 1% resistor, RTERM, to ground. The current
threshold ITERM, is set by the following formula:
I
V
R
R
V
I
TERM
TERM
TERM
TERM
==
100
100
,
BAT (Pin 2): Charge Current Output. Provides charge
current to the battery from the internal P-channel MOSFET,
and regulates the final float voltage to 4.2V. An internal
precision resistor divider from this pin sets the float
voltage. This divider is disconnected in shutdown mode to
minimize current drain from the battery.
CHRG (Pin 3): Charge Status Open-Drain Output. When
the battery is charging, the CHRG pin is pulled low by an
internal N-channel MOSFET. When the charge cycle is
completed, CHRG becomes high impedance.
GND (Pins 4, 9): Ground/Exposed Pad. The exposed
backside package pad (Pin 9) is electrical ground and
must be soldered to the PC board for maximum heat
transfer.


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