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LTC4068EDD-4.2#PBF

P1-P3P4-P6P7-P9P10-P12
4
LTC4068-4.2/LTC4068X-4.2
406842fa
TYPICAL PERFOR A CE CHARACTERISTICS
UW
Regulated Output (Float) Voltage
vs Charge Current
I
BAT
(mA)
0
V
FLOAT
(V)
4.24
300
405842 G04
4.18
4.14
100 200 400
4.12
4.10
4.26
4.22
4.20
4.16
500 600 700
V
CC
= 5V
T
A
= 25°C
R
PROG
= 1.25k
Regulated Output (Float) Voltage
vs Temperature
TEMPERATURE (°C)
–50
4.185
V
FLOAT
(V)
4.190
4.195
4.200
4.205
4.215
–25
02550
405842 G05
75 100
4.210
V
CC
= 5V
R
PROG
= 10k
Regulated Output (Float) Voltage
vs Supply Voltage
V
CC
(V)
4
4.185
V
FLOAT
(V)
4.190
4.195
4.200
4.205
4.215
4.5
5 5.5 6
405842 G06
6.5 7
4.210
T
A
= 25°C
R
PROG
= 10k
CHRG Pin I-V Curve
(Pull-Down State)
Trickle Charge Current
vs Temperature
ACPR Pin I-V Curve
(Pull-Down State)
V
CHRG
(V)
0
I
CHRG
(mA)
20
25
30
35
405842 G07
15
10
12
467
5
0
T
A
= –40°C
T
A
= 25°C
T
A
= 90°C
V
CC
= 5V
V
BAT
= 4V
V
ACPR
(V)
0
I
ACPR
(mA)
20
25
30
35
405842 G08
15
10
12
467
5
0
T
A
= –40°C
T
A
= 25°C
T
A
= 90°C
V
CC
= 5V
V
BAT
= 4V
TEMPERATURE (°C)
–50
0
I
TRKL
(mA)
10
20
30
40
60
–25
02550
405842 G09
75 100
50
V
CC
= 5V
V
BAT
= 2.5V
R
PROG
= 2k
LTC4068 ONLY
R
PROG
= 10k
Trickle Charge Current
vs Supply Voltage Charge Current vs Battery Voltage
V
CC
(V)
4
0
I
TRKL
(mA)
10
20
30
40
60
4.5
5 5.5 6
405842 G10
6.5 7
50
V
BAT
= 2.5V
T
A
= 25°C
R
PROG
= 2k
R
PROG
= 10k
LTC4068 ONLY
Trickle Charge Threshold Voltage
vs Temperature
TEMPERATURE (°C)
–50
V
TRKL
(V)
2.875
2.900
2.925
25
75
405842 G11
2.850
2.825
2.800
–25 0 50
2.950
2.975
3.000
100
V
CC
= 5V
R
PROG
= 10k
LTC4068 ONLY
V
BAT
(V)
2.4
I
BAT
(mA)
400
500
600
3.3 3.9
405842 G12
300
200
2.7 3
3.6 4.2 4.5
100
0
V
CC
= 5V
θ
JA
= 40°C/W
R
PROG
= 2k
LTC4068 ONLY
5
LTC4068-4.2/LTC4068X-4.2
406842fa
TYPICAL PERFOR A CE CHARACTERISTICS
UW
Charge Current vs Supply Voltage
Charge Current
vs Ambient Temperature
Recharge Threshold Voltage
vs Temperature
Power FET “ON” Resistance
vs Temperature
V
CC
(V)
4
0
I
BAT
(mA)
100
200
300
400
600
4.5
5 5.5 6
405842 G13
6.5 7
500
V
BAT
= 4V
T
A
= 25°C
θ
JA
= 40°C/W
R
PROG
= 2k
R
PROG
= 10k
TEMPERATURE (°C)
–50
I
BAT
(mA)
400
500
600
25 75
405842 G14
300
200
–25 0
50 100 125
100
0
V
CC
= 5V
V
BAT
= 4V
θ
JA
= 40°C/W
R
PROG
= 2k
ONSET OF THERMAL REGULATION
R
PROG
= 10k
TEMPERATURE (°C)
–50
4.04
V
RECHRG
(V)
4.06
4.08
4.10
4.12
4.16
–25
02550
405842 G15
75 100
4.14
V
CC
= 5V
R
PROG
= 10k
TEMPERATURE (°C)
–50
R
DS(ON)
(mΩ)
700
650
600
550
500
450
400
350
–25
02550
405842 G17
75 125100
V
CC
= 4.2V
I
BAT
= 100mA
R
PROG
= 2k
UU
U
PI FU CTIO S
ITERM (Pin 1): Charge Termination Program. The charge
termination current threshold current is programmed by
connecting a 1% resistor, R
TERM
, to ground. The current
threshold I
TERM
, 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.
6
LTC4068-4.2/LTC4068X-4.2
406842fa
When V
CC
is within 100mV of the BAT pin voltage, the
LTC4068 enters shutdown mode dropping the battery
drain current to less than 2µA.
ACPR (Pin 7): Power Supply Status Open-Drain Output.
When V
CC
is greater than the undervoltage lockout thresh-
old and at least 100mV above V
BAT
, the ACPR pin is pulled
to ground; otherwise, the pin is high impedance.
EN (Pin 8): Enable Input . A logic high on the EN pin will put
the LTC4068 into shutdown mode where the battery drain
current is reduced to less than 2µA and the supply current
is reduced to less than 50µA. A logic low or floating the EN
pin (allowing an internal 2MΩ pull-down resistor to pull
this pin low) enables charging.
UU
U
PI FU CTIO S
PROG (Pin 5): Charge Current Program and Charge Cur-
rent Monitor. Charge current is programmed by connect-
ing a 1% resistor, R
PROG
, to ground. When charging in
constant-current mode, this pin servos to 1V. In all modes,
the voltage on this pin can be used to measure the charge
current using the following formula:
I
BAT
= (V
PROG
/R
PROG
) • 1000
This pin is clamped to approximately 2.4V. Driving this pin
to voltages beyond the clamp voltage can draw large
currents and should be avoided.
V
CC
(Pin 6): Positive Input Supply Voltage. Provides
power to the charger. V
CC
can range from 4.25V to 6.5V.
This pin should be bypassed with at least a 1µF capacitor.
BLOCK DIAGRA
W
–
+
–
+
–
+
2
6
–
+
120°C
T
DIE
T
A
MA
CA
C1
*
1×
1000×
VA
R1
BAT
R2
R3
1V
0.1V
R4
R5
PROG
5µA
R
PROG
REF
1.211V
V
CC
CHRG
3
EN
8
GND
4, 9
406842 BD
–
+
C2*
2.9V TO BAT
*TRICKLE
CHARGE
DISABLED
ON THE
LTC4068X
TERM
ACPRCHARGE
SHDNEN
LOGIC
ACPR
7
5
1×
ITERM
R
TERM
1
P1-P3P4-P6P7-P9P10-P12

LTC4068EDD-4.2#PBF

Mfr. #:
Buy LTC4068EDD-4.2#PBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Battery Management Standalone Li-Ion Battery Charger in DFN
Lifecycle:
New from this manufacturer.
Delivery:
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