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参数资料
| 型号： | LTC4098EUDC-3.6#PBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | BATTERY CHARGE CONTROLLER, PQCC20 |
| 封装： | 3 X 4 MM, 0.75 MM HEIGHT, LEAD FREE, PLASTIC, QFN-20 |
| 文件页数： | 10/32页 |
| 文件大小： | 1915K |
| 代理商： | LTC4098EUDC-3.6#PBF |
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LTC4098-3.6
409836f
by monitoring the PROG pin voltage and using the fol-
lowing equation:
I
V
R
BAT
PROG
=
1030
In many cases, the actual battery charge current, IBAT, will
belowerthantheprogrammedcurrent,ICHG,duetolimited
input power available and prioritization to the system load
drawn from VOUT.
Charge Status Indication
The CHRG pin indicates the status of the battery charger.
FourpossiblestatesarerepresentedbyCHRGwhichinclude
charging, not charging (or float charge current less than
programmed end of charge indication current), unrespon-
sive battery and battery temperature out of range.
The signal at the CHRG pin can be easily recognized as
one of the above four states by either a human or a mi-
croprocessor. An open-drain output, the CHRG pin can
drive an indicator LED through a current limiting resistor
for human interfacing or simply a pull-up resistor for
microprocessor interfacing.
To make the CHRG pin easily recognized by both humans
and microprocessors, the pin is either a DC signal of ON
for charging, OFF for not charging or it is switched at
high frequency (35kHz) to indicate an NTC fault. While
switching at 35kHz, its duty cycle is modulated at a slow
rate that can be recognized by a human.
When charging begins, CHRG is pulled low and remains
lowforthedurationofanormalchargecycle.Whencharge
current drops to 1/10th the value programmed by RPROG,
the CHRG pin is released (Hi-Z). The CHRG pin does not
respondtotheC/10thresholdiftheLTC4098-3.6isinVBUS
currentlimit.Thispreventsfalseend-of-chargeindications
due to insufficient power available to the battery charger. If
a fault occurs while charging, the pin is switched at 35kHz.
Whileswitching,itsdutycycleismodulatedbetweenahigh
and low value at a very low frequency. The low and high
duty cycles are disparate enough to make an LED appear
to be on or off thus giving the appearance of “blinking.”
Each of the two faults has its own unique “blink” rate for
human recognition as well as two unique duty cycles for
machine recognition.
Table 2 illustrates the four possible states of the CHRG
pin when the battery charger is active.
Table 2. CHRG Signal
STATUS
FREQUENCY
MODULATION
(BLINK) FREQUENCY
DUTY
CYCLES
Charging
0Hz
0Hz (Low Z)
100%
IBAT < C/10
0Hz
0Hz (Hi-Z)
0%
NTC Fault
35kHz
1.5Hz at 50%
6.25% or 93.75%
Bad Battery
35kHz
6.1Hz at 50%
12.5% or 87.5%
Notice that an NTC fault is represented by a 35kHz pulse
trainwhosedutycycletogglesbetween6.25%and93.75%
at a 1.5Hz rate. A human will easily recognize the 1.5Hz
rate as a “slow” blinking which indicates the out of range
battery temperature while a microprocessor will be able
to decode either the 6.25% or 93.75% duty cycles as an
NTC fault.
If a battery is found to be unresponsive to charging (i.e.,
its voltage remains below 2.85V for 1/2 hour), the CHRG
pingivesthebatteryfaultindication.Forthisfault,ahuman
would easily recognize the frantic 6.1Hz “fast” blink of the
LEDwhileamicroprocessorwouldbeabletodecodeeither
the 12.5% or 87.5% duty cycles as a bad cell fault.
Because the LTC4098-3.6 is a 3-terminal PowerPath
product, system load is always prioritized over battery
charging. Due to excessive system load, there may not
be sufficient power to charge the battery beyond the bad-
cell threshold voltage within the bad-cell timeout period.
In this case the battery charger will falsely indicate a bad
cell. System software may then reduce the load and reset
the battery charger to try again.
Although very improbable, it is possible that a duty cycle
reading could be taken at the bright-dim transition (low
duty cycle to high duty cycle). When this happens the
duty cycle reading will be precisely 50%. If the duty cycle
reading is 50%, system software should disqualify it and
take a new duty cycle reading.
operaTion
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