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參數(shù)資料
| 型號： | BQ25070DQCR |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 1 A BATTERY CHARGE CONTROLLER, PDSO10 |
| 封裝： | 2 X 3 MM, GREEN, PLASTIC, SON-10 |
| 文件頁數(shù)： | 5/21頁 |
| 文件大?。?/td> | 664K |
| 代理商： | BQ25070DQCR |
tHI
2.0ms
ICdisabledif CTRL
pulledhighfor >2.0ms
# ofpulses decodedonce
CTRL pulledlowfor 2.0ms
2.0ms
tCTRL_DGL
Powerupwithdefault
285mA currentlimit
CTRL
tLO
IIN
ICcanbe
programmedduring
tWAIT
2.0ms
475mA currentlimit
programmed
190mA currentlimit
programmed
tCTRL_LATCH
SLUSA66
– JULY 2011
Table 1. Pulse Counting Map for CTRL Interface
# of Pulses
Current Limit
1
No Change
2
No Change
3
No Change
4
93 mA
5
187 mA
6
280 mA
7
374 mA
8
467 mA
9
654 mA
10
794 mA
11
935 mA
>11
No Change
If, at any time, the CTRL input is held high for more than 2ms, the IC is disabled. When disabled, charging is
suspended and the bq25070 input quiescent current is reduced.
Figure 15. CTRL Timing Diagram
THERMAL REGULATION AND THERMAL SHUTDOWN
The bq25070 contains a thermal regulation loop that monitors the die temperature continuously. If the
temperature exceeds TJ(REG), the device automatically reduces the charging current to prevent the die
temperature from increasing further. In some cases, the die temperature continues to rise despite the operation
of the thermal loop, particularly under high VIN conditions. If the die temperature increases to TJ(OFF), the IC is
turned off. Once the device die temperature cools by TJ(OFF-HYS), the device turns on and returns to thermal
regulation. Continuous over-temperature conditions result in the pulsing of the load current. If the junction
temperature of the device exceeds TJ(OFF), the charge FET is turned off. The FET is turned back on when the
junction temperature falls below TJ(OFF) – TJ(OFF-HYS).
Note that these features monitor the die temperature of the bq25070. This is not synonymous with ambient
temperature. Self heating exists due to the power dissipated in the IC because of the linear nature of the battery
charging algorithm.
Copyright
2011, Texas Instruments Incorporated
13
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