LTC4068EDD-4.2 Linear Technology, LTC4068EDD-4.2 Datasheet - Page 6

• Manufacturer Part Number: LTC4068EDD-4.2
• Description: IC BATT CHARGER W/PROG TERM 8DFN
• Manufacturer: Linear Technology

Specifications of LTC4068EDD-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
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

BLOCK DIAGRA
LTC4068-4.2/LTC4068X-4.2
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
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:
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
power to the charger. V
This pin should be bypassed with at least a 1µF capacitor.
6
CC
I
U
BAT
(Pin 6): Positive Input Supply Voltage. Provides
= (V
U
PROG
7
3
8
/R
ACPR
CHRG
EN
PROG
U
PROG
CC
) • 1000
CHARGE
, to ground. When charging in
W
can range from 4.25V to 6.5V.
EN
LOGIC
TERM
SHDN
ACPR
120°C
T
DIE
2.9V
T
–
A
–
C2*
*
CA
TO BAT
+
+
C1
*TRICKLE
CHARGE
DISABLED
ON THE
LTC4068X
+
–
1×
When V
LTC4068 enters shutdown mode dropping the battery
drain current to less than 2µA.
ACPR (Pin 7): Power Supply Status Open-Drain Output.
When V
old and at least 100mV above V
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.
1
R
ITERM
TERM
1×
5
CC
CC
R
PROG
PROG
is greater than the undervoltage lockout thresh-
–
is within 100mV of the BAT pin voltage, the
MA
R3
1V
R4
0.1V
R5
+
6
V
1.211V
CC
REF
VA
5µA
+
–
GND
4, 9
BAT
, the ACPR pin is pulled
R1
R2
406842 BD
1000×
BAT
2
406842fa