LTC4065EDC Linear Technology, LTC4065EDC Datasheet - Page 9

• Manufacturer Part Number: LTC4065EDC
• Manufacturer: Linear Technology

Specifications of LTC4065EDC

• Battery Type: Li-Ion
• Output Current: 500mA
• Output Voltage: 4.2V
• Operating Supply Voltage (min): 3.75V
• Operating Supply Voltage (max): 5.5V
• Operating Temp Range: -40C to 85C
• Mounting: Surface Mount
• Pin Count: 6
• Operating Temperature Classification: Industrial
• Lead Free Status / Rohs Status: Not Compliant

OPERATIO
SI PLIFIED
The LTC4065 is a linear battery charger designed primarily
for charging single cell lithium-ion batteries. Featuring an
internal P-channel power MOSFET, the charger uses a
constant-current/constant-voltage charge algorithm with
programmable current. Charge current can be programmed
up to 750mA with a final float voltage accuracy of ±0.6%.
The CHRG open-drain status output indicates if C/10 has
been reached. No blocking diode or external sense resistor
is required; thus, the basic charger circuit requires only
two external components. The ACPR pin (LTC4065A)
monitors the status of the input voltage with an open-drain
output. An internal termination timer and trickle charge
W
5
2
ACPR
CHRG
PROG
+
C/10
0.1V
U
–
2.9V
BAT
BLOCK DIAGRA S
REF
–
+
LOBAT
C2
C3
R3
R4
R5
+
–
+
–
1V
0.1V
1.2V
3.6V
V
BAT
+ 80mV
–
Figure 1b. LTC4065A Block Diagram
CA
W
D1
+
M2
×1
MP
6
PROG
R
PROG
4V
low-battery conditioning adhere to battery manufacturer
safety guidelines. Furthermore, the LTC4065 is capable of
operating from a USB power source.
An internal thermal limit reduces the programmed charge
current if the die temperature attempts to rise above a
preset value of approximately 115°C. This feature protects
the LTC4065 from excessive temperature and allows the
user to push the limits of the power handling capability of
a given circuit board without risk of damaging the LTC4065
or external components. Another benefit of the LTC4065
thermal limit is that charge current can be set according to
–
+
–
ENABLE
V
MA
4
CC
C1
V
CC
+
1
M1
×1000
GND
R1
R2
+
LTC4065/LTC4065A
SHUTDOWN
VA
CHARGE CONTROL
D2
1.2V
D3
–
LOGIC
TA
OSCILLATOR
+
–
COUNTER
115°C
T
DIE
BAT
4056 F01b
3
4065fb
9
+