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LTC4069 Datasheet(PDF) 7 Page - Linear Integrated Systems

Part # LTC4069
Description  Standalone 750mA Li-Ion Battery Charger in 2 2 DFN with NTC Thermistor Input
Download  18 Pages
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Manufacturer  LINEAR [Linear Integrated Systems]
Direct Link  http://www.linearsystems.com
Logo LINEAR - Linear Integrated Systems

LTC4069 Datasheet(HTML) 7 Page - Linear Integrated Systems

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LTC4069
7
4069fc
For more information www.linear.com/LTC4069
siMpliFieD block DiagraM
+
+
2
+
MP
M2
1
×
M1
1000
×
VCC
VCC
R1
R2
MIN
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 Block Diagram
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
programmablecurrent.Chargecurrentcanbeprogrammed
up to 750mA with a final float voltage accuracy of ±0.6%.
The CHRG open-drain status output indicates if C/10 has
beenreached.Noblockingdiodeorexternalsenseresistor
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 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
presetvalueofapproximately115°C.Thisfeatureprotects
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 application with the assurance
that the charger will automatically reduce the current in
worst-case conditions.


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