ltc4069edc-trpbf Linear Technology Corporation, ltc4069edc-trpbf Datasheet - Page 7

• Manufacturer Part Number: ltc4069edc-trpbf
• Description: Standalone 750ma Li-ion Battery Charger In 2 X 2 Dfn With Ntc Thermistor Input
• Manufacturer: Linear Technology Corporation

OPERATIO
SI PLIFIED
The LTC4069 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. An internal termination timer
and trickle charge low-battery conditioning adhere to
battery manufacturer safety guidelines. Furthermore, the
V
CC
W
R
NOM
R
NTC
5
2
NTC
CHRG
V
CC
R7
R8
R9
R10
U
BLOCK DIAGRA
–
+
+
–
+
–
PROG
C1
C2
C3
+
C/10
0.1V
–
COLD
TOO
HOT
TOO
NTC_EN
2.9V
BAT
OR
115°C
T
DIE
REF
–
+
LOBAT
AND
R3
R4
R5
+
–
Figure 1. LTC4069 Block Diagram
TA
1V
0.1V
W
1.2V
SUSPEND
D3
–
CA
D1
+
LTC4069 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 LTC4069 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 LTC4069
or external components. Another benefit of the LTC4069
thermal limit is that charge current can be set according to
typical, not worst-case, ambient temperatures for a given
M2
1×
MP
6
PROG
R
4V
PROG
–
+
–
ENABLE
V
MA
4
CC
C4
V
CC
+
1
M1
1000×
GND
R1
R2
MIN
SUSPEND
+
SHUTDOWN
VA
CHARGE CONTROL
D2
–
3.6V
LOGIC
1.2V
+
–
C5
LTC4069
OSCILLATOR
COUNTER
UVLO
BAT
4069 F01
3
4069fa
7
+