LTC4069 查看數據表（PDF） - Linear Technology
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LTC4069
Linear Technology
LTC4069 Datasheet PDF : 18 Pages
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LTC4069
SIMPLIFIED Block Diagram
VCC
R7
VCC
R8
RNOM
NTC
5
RNTC
R9
R10
CHRG
2
–
C1
+
TDIE
115°C
TOO
COLD
OR
+
D3
TA
–
AND
SUSPEND
M2
1×
D1
VCC
4
VCC
+
C2
TOO
–
HOT
+
NTC_EN
C3
–
REF
1.2V
PROG 0.1V
R3
1V
R4
0.1V
C/10
R5
–
2.9V
LOBAT
+
BAT
CA
–+
MP
–+
MA
ENABLE
+
C4
4V –
PROG
6
RPROG
M1
1000×
+
C5
3.6V –
D2
UVLO
R1
VA
BAT
3
+
1.2V
R2
CHARGE CONTROL
MIN
SUSPEND
LOGIC
COUNTER
SHUTDOWN
GND
1
OSCILLATOR
4069 F01
Figure 1. LTC4069 Block Diagram
Operation
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
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 application with the assurance
that the charger will automatically reduce the current in
worst-case conditions.
4069fc
For more information www.linear.com/LTC4069
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