參數(shù)資料
型號(hào)： LTC4064
廠商： Linear Technology Corporation
英文描述： Monolithic Linear Charger for Back-Up Li-Ion Batteries
中文描述： 單片線性充電器作為備份鋰離子電池
文件頁(yè)數(shù)： 6/16頁(yè)
文件大?。?/td> 174K
代理商： LTC4064
LTC4064
6
4064f
PIU
CHRG (Pin 1):
Open-Drain Charge Status Output. When
the battery is being charged, the CHRG pin is pulled low by
an internal N-channel MOSFET. When the charge current
drops to 10% of the full-scale current, the N-channel
MOSFET latches off and a 30
μ
A current source is con-
nected from the CHRG pin to ground. The C/10 latch can
be cleared by grounding the SHDN pin, momentarily, or
toggling V
CC
. When the timer runs out or the input supply
is removed, the current source is disconnected and the
CHRG pin is forced high impedance.
V
CC
(Pin 2):
Positive Input Supply Voltage. When V
CC
is
within 35mV of V
BAT
or less than the undervoltage lockout
threshold, the LTC4064 enters sleep mode, dropping I
BAT
to less than 3
μ
A. V
CC
can range from 4.25V to 6.5V.
Bypass this pin with at least a 4.7
μ
F ceramic capacitor to
ground.
FAULT (Pin 3):
Open-Drain Fault Status Output. The
FAULT open-drain logic signal indicates that the charger
has timed out under trickle charge conditions or the NTC
comparator is indicating an out-of-range battery tempera-
ture condition. If V
BAT
is less that 2.48V, trickle charging
begins whereby the charge current drops to one tenth of
its programmed value and the timer period is reduced by
a factor of four. When one fourth of the timing period has
elapsed, if V
BAT
is still less than 2.48V, trickle charging
stops and the FAULT pin latches to ground. The fault can
be cleared by toggling V
CC
, momentarily grounding the
SHDN pin or pulling the BAT pin above 2.48V. If the NTC
comparator is indicating an out-of-range battery tempera-
ture condition, the FAULT pin will pull to ground until the
temperature returns to the acceptable range.
TIMER (Pin 4):
Timer Capacitor. The timer period is set by
placing a capacitor, C
TIMER
, to ground. The timer period is:
Time (Hours) = (C
TIMER
3 hr)/(0.1
μ
F)
Short the TIMER pin to ground to disable the internal timer
function.
GND (Pins 5, 11):
Ground. The exposed backside of the
package is also ground and must be soldered to the PC
board for maximum heat transfer.
NTC (Pin 6):
Input to the NTC (Negative Temperature
Coefficient) Thermistor Temperature Monitoring Circuit.
With an external 10k
NTC thermistor to ground and a 1%
resistor to V
CC
, this pin can sense the temperature of the
battery pack and stop charging when it is out of range.
When the voltage at this pin drops below (0.5)(V
CC
) at hot
temperatures or rises above (0.875)(V
CC
) at cold, charg-
ing is suspended and the internal timer is frozen. The
CHRG pin output status is not affected in this hold state.
The FAULT pin will be pulled to ground, but not latched.
When the temperature returns to an acceptable range,
charging will resume and the FAULT pin is released. The
NTC feature can be disabled by grounding the NTC pin.
PROG (Pin 7):
Charge Current Program and Charge Cur-
rent Monitor Pin. The charge current is programmed by
connecting a resistor, R
PROG
to ground. When in con-
stant-current mode, the LTC4064 servos the PROG pin
voltage to 1.5V. In all modes the voltage on the PROG pin
can be used to measure the charge current as follows:
I
BAT
= (V
PROG
/R
PROG
) 1000.
SHDN (Pin 8):
Shutdown Input Pin. Pulling the SHDN pin
to ground will put the LTC4064 into standby mode where
the BAT drain current is reduced to less than 3
μ
A, and the
supply current is reduced to less than 25
μ
A. For normal
operation, pull the SHDN pin up to V
CC
.
BAT (Pin 9):
Charge Current Output. A bypass capacitor of
at least 1
μ
F with a 1
series resistor is required to keep the
loop stable when the battery is not present. A precision
internal resistor divider sets the final float potential on this
pin. The internal resistor divider is disconnected in sleep
and shutdown mode.
ACPR (Pin 10):
Open-Drain Power Supply Status Output.
When V
CC
is greater than the undervoltage lockout thresh-
old and at least 35mV above V
BAT
, the ACPR pin will pull
to ground. Otherwise, the pin is high impedance.
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