參數(shù)資料
型號(hào)： LTC4090EDJC#TRPBR
廠商： LINEAR TECHNOLOGY CORP
元件分類： 電源管理
英文描述： 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO22
封裝： 6 X 3 MM, 0.75 MM HEIGHT, LEAD FREE, PLASTIC, MO-229WXXX, DFN-22
文件頁(yè)數(shù)： 8/28頁(yè)
文件大小： 392K
代理商： LTC4090EDJC#TRPBR
LTC4090
16
4090f
OPERATION
where VPROG is the PROG pin voltage and RPROG is the
total resistance from the PROG pin to ground. Keep in
mind that when the LTC4090 is powered from the IN pin,
the programmed input current limit takes precedence over
the charge current. In such a scenario, the charge current
cannot exceed the programmed input current limit.
For example, if typical 500mA charge current is required,
calculate:
R
V
mA
k
PROG ==
1
500
50 000 100
,
For best stability over temperature and time, 1% metal
lm resistors are recommended. Under trickle charge
conditions, this current is reduced to 10% of the full-
scale value.
The Charge Timer
The programmable charge timer is used to terminate the
charge cycle. The timer duration is programmed by an
external capacitor at the TIMER pin. The charge time is
typically:
t
hours
C
R
hours
F
k
TIMER
PROG
()
.
=
3
0 1
100
The timer starts when an input voltage greater than the
undervoltage lockout threshold level is applied or when
leaving shutdown and the voltage on the battery is less than
the recharge threshold. At power-up or exiting shutdown
with the battery voltage less than the recharge threshold,
the charge time is a full cycle. If the battery is greater than
the recharge threshold the timer will not start and charging
is prevented. If after power-up the battery voltage drops
below the recharge threshold, or if after a charge cycle
the battery voltage is still below the recharge threshold,
the charge time is set to one-half of a full cycle.
The LTC4090 has a feature that extends charge time au-
tomatically. Charge time is extended if the charge current
in constant current mode is reduced due to load current
or thermal regulation. This change in charge time is in-
versely proportional to the change in charge current. As
the LTC4090 approaches constant voltage mode the charge
current begins to drop. This change in charge current is
due to normal charging operation and does not affect the
timer duration.
Consider, for example, a USB charge condition where
RCLPROG = 2k, RPROG = 100k and CTIMER = 0.1μF. This
corresponds to a three hour charge cycle. However, if the
HPWR input is set to a logic low, then the input current
limit will be reduced from 500mA to 100mA. With no ad-
ditional system load, this means the charge current will
be reduced to 100mA. Therefore, the termination timer
will automatically slow down by a factor of ve until the
charger reaches constant voltage mode (i.e. VBAT ap-
proaches 4.2V) or HPWR is returned to a logic high. The
charge cycle is automatically lengthened to account for
the reduced charge current. The exact time of the charge
cycle will depend on how long the charger remains in
constant current mode and/or how long the HPWR pin
remains logic low.
Once a time-out occurs and the voltage on the battery is
greater than the recharge threshold, the charge current
stops, and the CHRG output assumes a high impedance
state if it has not already done so.
Connecting the TIMER pin to ground disables the battery
charger.
CHRG Status Output Pin
When the charge cycle starts, the CHRG pin is pulled to
ground by an internal N-channel MOSFET capable of driv-
ing an LED. When the charge current drops below 10%
of the programmed full charge current while in constant
voltage mode, the pin assumes a high impedance state,
but charge current continues to ow until the charge
time elapses. If this state is not reached before the end
of the programmable charge time, the pin will assume a
high impedance state when a time-out occurs. The CHRG
current detection threshold can be calculated by the fol-
lowing equation:
I
V
R
V
R
DETECT
PROG
==
01
50 000
5000
.
,
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