參數(shù)資料
型號(hào)： LTC4155IUFD#TRPBF
廠商： LINEAR TECHNOLOGY CORP
元件分類： 電源管理
英文描述： POWER SUPPLY SUPPORT CKT, PQCC28
封裝： 5 X 4 MM, 0.75 MM HEIGHT, PLASTIC, MO-220WXXX-X, QFN-28
文件頁(yè)數(shù)： 25/52頁(yè)
文件大?。?/td> 473K
代理商： LTC4155IUFD#TRPBF
LTC4155
31
4155f
Full Capacity Charge Indication (C/x)
Since the PROG pin always represents the actual charge
current flowing, even in the constant-voltage phase of
charging, the PROG pin voltage represents the battery’s
state-of-charge during that phase. The LTC4155 has a
full capacity charge indication comparator on the PROG
pin which reports its results via the I2C port. Selection
levels for the C/x comparator of 24mV, 60mV, 120mV
and 240mV are available by I2C control bits CXSET[1:0]
(Table 13). Recall that the PROG pin servo voltage can be
programmed between 150mV to 1.2V. If the 1.2V servo
setting represents the full-charge rate of the battery (1C),
then the 120mV C/x setting would be equivalent to C/10.
Likewise, the 240mV C/x setting would represent C/5, the
24mV setting C/50 and the 60mV C/20. C/x indication is
masked unless the battery charger is in constant-voltage
mode to prevent false indication caused by limited input
power.
Charge Termination
The battery charge cycle is terminated either at the expira-
tionofabuilt-inprogrammableterminationsafetytimer,or
optionallyatthefullcapacitychargeindication(C/x).When
the voltage on the battery reaches the user-programmed
float voltage, the safety timer is started and the C/x com-
parator is enabled. After the safety timer expires, charging
of the battery will discontinue and no more current will
be delivered. The safety timer’s default expiration time
of four hours may be altered from one to eight hours in
four settings using the I2C bit TIMER[1:0] (Table 10). The
eight hour timer termination setting will also terminate the
charge cycle before the expiration of the eight hour timer
when the battery charge current falls to the programmed
full capacity (C/x) charge indication threshold.
Automatic Recharge
After the battery charger terminates, it will remain off,
drawing only single microamperes of current from the
battery. If the portable product remains in this state long
enough, the battery will eventually self discharge. To en-
sure that the battery is always topped off, a new charge
cycle will automatically begin when the battery voltage
falls below VRECHRG (typically 97.6% of the programmed
VFLOAT). The termination safety timer will also reset back
to zero. To prevent brief excursions below VRECHRG from
resettingthesafetytimer,thebatteryvoltagemustbebelow
VRECHRG for more than 2.5ms. A new charge cycle will
also be initiated if input (USB or WALL) power is cycled
or if the charger is momentarily disabled using the I2C
port. The flow chart in Figure 7 represents the battery
charger’s algorithm.
NTC Thermistor Monitor
The LTC4155 includes a 7-bit expanded scale analog to
digital converter (ADC) to monitor the battery tempera-
ture using an external negative temperature coefficienct
(NTC) thermistor placed close to the battery pack. To use
this feature, connect the thermistor, RNTC, between the
NTC pin and ground, and a bias resistor, RBIAS, between
NTCBIAS and NTC, as shown in Figure 8. RBIAS should be
a 1% resistor with a value equal to the value of the chosen
NTC thermistor at 25°C (r25).
ThethermistormeasurementresultisavailableviaI2Cport
status reporting, except when the ship-and-store feature
has been activated. When not in ship-and-store mode, the
thermistorisautomaticallymeasuredapproximatelyevery
2.4 seconds. The thermistor measurement result avail-
able to the I2C port is updated at the end of each sample
period. The low duty cycle of thermistor bias reduces
OPERATION
相關(guān)PDF資料
PDF描述
LTC4155IUFD#PBF POWER SUPPLY SUPPORT CKT, PQCC28
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LTC4215IUFD-2#TR 1-CHANNEL POWER SUPPLY SUPPORT CKT, PQCC24
LTC4215IUFD-2#TRPBF 1-CHANNEL POWER SUPPLY SUPPORT CKT, PQCC24
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