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LTC4069-4.4 Datasheet(PDF) 7 Page - Linear Technology

Part # LTC4069-4.4
Description  Standalone 750mA Li-Ion Battery Charger in 2 횞 2 DFN with NTC Thermistor Input
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC4069-4.4 Datasheet(HTML) 7 Page - Linear Technology

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LTC4069-4.4
7
406944fa
SIMPLIFIED BLOCK DIAGRAM
–+
–+
2
+
MP
M2
1
M1
1000
VCC
VCC
R1
R2
ENABLE
R3
R4
R5
2.9V
CHRG
6
PROG
1
GND
4069 F01
RPROG
BAT
1V
PROG
C/10
C1
+
TA
TDIE
115°C
0.1V
1.2V
SUSPEND
D3
TOO
HOT
TOO
COLD
NTC_EN
0.1V
D2
3.6V
D1
1.2V
REF
CA
MA
LOBAT
5
R7
NTC
R8
R9
R10
VCC
VCC
+
UVLO
3
4
BAT
LOGIC
COUNTER
OSCILLATOR
CHARGE CONTROL
+
C3
+
C2
C5
VA
4V
+
SHUTDOWN
SUSPEND
OR
AND
RNOM
RNTC
C4
OPERATION
Figure 1. LTC4069-4.4 Block Diagram
The LTC4069-4.4 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 LTC4069-4.4 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 LTC4069-4.4 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
LTC4069-4.4 or external components. Another benefit
of the LTC4069-4.4 thermal limit is that charge current
can be set according to typical, not worst-case, ambient


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