LTC4068XEDD-4.2 Linear Technology, LTC4068XEDD-4.2 Datasheet - Page 5

• Manufacturer Part Number: LTC4068XEDD-4.2
• Description: IC CHARGER BATT LI-ON 8-DFN
• Manufacturer: Linear Technology
• Type: Battery Chargerr

Specifications of LTC4068XEDD-4.2

• Function: Charge Management
• Battery Type: Lithium-Ion (Li-Ion)
• Voltage - Supply: 4.25 V ~ 6.5 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 8-WFDFN Exposed Pad
• Output Current: 950mA
• Output Voltage: 4.2V
• Operating Supply Voltage (min): 4.25V
• Operating Supply Voltage (max): 6.5V
• Operating Temp Range: -40C to 85C
• Package Type: DFN
• Mounting: Surface Mount
• Pin Count: 8
• Operating Temperature Classification: Industrial
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

PI FU CTIO S
ITERM (Pin 1): Charge Termination Program. The charge
termination current threshold current is programmed by
connecting a 1% resistor, R
threshold I
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
TYPICAL PERFOR A CE CHARACTERISTICS
U
I
TERM
=
U
TERM
R
100
TERM
, is set by the following formula:
V
600
500
400
300
200
100
700
650
600
550
500
450
400
350
0
–50
,
4
Power FET “ON” Resistance
vs Temperature
U
Charge Current vs Supply Voltage
R
V
T
θ
V
I
R
BAT
A
BAT
JA
CC
PROG
TERM
= 25°C
–25
= 40°C/W
= 4.2V
= 100mA
= 4V
4.5
= 2k
W
=
TERM
0
TEMPERATURE (°C)
5
I
100
TERM
R
R
PROG
25
PROG
V
, to ground. The current
CC
U
5.5
V
(V)
= 10k
= 2k
50
6
75
6.5
100
405842 G13
405842 G17
125
7
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.
4.16
4.14
4.06
4.04
4.12
4.10
4.08
600
500
400
300
200
100
0
–50
–50
LTC4068-4.2/LTC4068X-4.2
Recharge Threshold Voltage
vs Temperature
Charge Current
vs Ambient Temperature
V
R
V
V
θ
CC
PROG
CC
BAT
JA
–25
= 5V
–25
= 40°C/W
ONSET OF THERMAL REGULATION
= 5V
= 4V
= 10k
0
TEMPERATURE (°C)
TEMPERATURE (°C)
0
R
R
PROG
PROG
25
25
= 10k
= 2k
50
50
75
75
100
405842 G14
405842 G15
100
125
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