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參數(shù)資料
| 型號： | ISL6292-1CR4-T |
| 廠商： | INTERSIL CORP |
| 元件分類： | 電源管理 |
| 英文描述： | Octal D-Type Edge-Triggered Flip-Flops with 3-State Outputs 20-SO -40 to 85 |
| 中文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PQCC16 |
| 封裝： | 4 X 4 MM, PLASTIC, MO-220VGGC, QFN16 |
| 文件頁數(shù)： | 6/20頁 |
| 文件大?。?/td> | 550K |
| 代理商： | ISL6292-1CR4-T |
14
FN9105.9
December 17, 2007
not clear until the voltage rises above 0.406V. The actual
accuracy of the 2.8V is not important because all the
thresholds and the TEMP pin voltage are ratios determined by
the resistor dividers, as shown in Figure 22.
The NTC thermistor is required to have a resistance ratio of
7:1 at the low and the high temperature limits, that is:
This is because at the low temperature limit, the TEMP pin
voltage is 1.4V, which is 1/2 of the 2.8V bias. Thus:
the other hand, at the high temperature limit the TEMP pin
voltage is 0.35V, 1/8 of the 2.8V bias. Therefore:
Various NTC thermistors are available for this application.
Table 1 shows the resistance ratio and the negative
temperature coefficient of the curve-1 NTC thermistor from
Vishay (http://www.vishay.com) at various temperatures. The
resistance at +3°C is approximately seven times the
resistance at +47°C, which is shown in Equation 10:
Therefore, if +3°C is the low temperature limit, then the high
temperature limit is approximately +47°C. The pull-up resistor
RU can choose the same value as the resistance at +3°C.
The temperature hysteresis can be estimated. At the low
temperature, the hysteresis is approximately estimated in
Equation 11:
where 0.051 is the NTC at +3°C. Similarly, the high
temperature hysteresis is estimated in Equation 12:
where the 0.039 is the NTC at +47°C.
For applications that do not need to monitor the battery
temperature, the NTC thermistor can be replaced with a
regular resistor of a half value of the pull-up resistor RU.
Another option is to connect the TEMP pin to the IREF pin
that has a 0.8V output. With such connection, the IREF pin
can no longer be programmed with logic inputs.
Battery Removal Detection
The ISL6292 assumes that the thermistor is co-packed with
the battery and is removed together with the battery. When
the charger senses a TEMP pin voltage that is 2.1V or
higher, it assumes that the battery is removed. The battery
removal detection circuit is also shown in Figure 22. When a
battery is removed, a FAULT signal is indicated and charging
is halted. When a battery is inserted again, a new charge
cycle starts.
Indications
The ISL6292 has three indications: the input presence, the
charge status, and the fault indication. The input presence is
indicated by the V2P8 pin while the other two indications are
presented by the STATUS pin and FAULT pin respectively.
Figure 23 shows the V2P8 pin voltage vs the input voltage.
Table 2 summarizes the other two pins.
Shutdown
The ISL6292 can be shutdown by pulling the EN pin to
ground. When shut down, the charger draws typically less
than 30A current from the input power and the 2.8V output
at the V2P8 pin is also turned off. The EN pin needs to be
driven with an open-drain or open-collector logic output, so
that the EN pin is floating when the charger is enabled.
TABLE 1. RESISTANCE RATIO OF VISHAY’S CURVE-1 NTC
TEMPERATURE (°C)
RT/R25°C
NTC (%/°C)
0
3.266
5.1
3
2.806
5.1
5
2.540
5.0
25
1.000
4.4
45
0.4368
4.0
47
0.4041
3.9
50
0.3602
3.9
R
COLD
R
HOT
--------------------
7
=
(EQ. 7)
R
COLD
R
U
=
(EQ. 8)
R
HOT
R
U
7
--------
=
(EQ. 9)
R
3
°C
R
47
°C
-----------------
7
=
(EQ. 10)
T
hysLOW
1.4V-1.2V
1.4V 0.051
--------------------------------
3
≈≈
°C
()
(EQ. 11)
T
hysHIGH
0.406V-0.35V
0.35V 0.039
--------------------------------------
4
≈≈
°C
()
(EQ. 12)
TABLE 2. STATUS INDICATIONS
FAULT STATUS
INDICATION
High
Charge completed with no fault (Inhibit) or
Standby
*Both outputs are pulled up with external resistors.
FIGURE 23. THE V2P8 PIN OUTPUT vs THE INPUT VOLTAGE
AT THE VIN PIN. VERTICAL: 1V/DIV,
HORIZONTAL: 100ms/DIV
3.4V
2.4V
2.8V
V
IN
V2P8
ISL6292
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| ISL6292-1CR4Z | Octal D-Type Edge-Triggered Flip-Flops with 3-State Outputs 20-SO -40 to 85 |
| ISL6292-1CR5 | Li-ion/Li Polymer Battery Charger |
| ISL6292-1CR5-T | Octal D-Type Edge-Triggered Flip-Flops with 3-State Outputs 20-TSSOP -40 to 85 |
| ISL6406CVZ | Quadruple 2-Input Positive-NAND Gates 14-SO -40 to 85 |
| ISL6426CB | Triple 3-Input Positive-NAND Gates 14-SOIC -40 to 85 |
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| ISL6292-1CR4Z | 功能描述:電池管理 LD VER OF ISL6292-1C R4 RoHS:否 制造商:Texas Instruments 電池類型:Li-Ion 輸出電壓:5 V 輸出電流:4.5 A 工作電源電壓:3.9 V to 17 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:VQFN-24 封裝:Reel |
| ISL6292-1CR4Z-T | 功能描述:電池管理 LD VER OF ISL6292-1C R4-T RoHS:否 制造商:Texas Instruments 電池類型:Li-Ion 輸出電壓:5 V 輸出電流:4.5 A 工作電源電壓:3.9 V to 17 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:VQFN-24 封裝:Reel |
| ISL6292-1CR5 | 功能描述:IC BATT CHRGR LI-ION 4.1V 16-QFN RoHS:否 類別:集成電路 (IC) >> PMIC - 電池管理 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 功能:充電管理 電池化學(xué):鋰離子（Li-Ion）、鋰聚合物（Li-Pol） 電源電壓:3.75 V ~ 6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:SC-74A，SOT-753 供應(yīng)商設(shè)備封裝:SOT-23-5 包裝:剪切帶 (CT) 產(chǎn)品目錄頁面:669 (CN2011-ZH PDF) 其它名稱:MCP73831T-2ACI/OTCT |
| ISL6292-1CR5-T | 功能描述:IC BATT CHRGR LI-ION 4.1V 16-QFN RoHS:否 類別:集成電路 (IC) >> PMIC - 電池管理 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 功能:充電管理 電池化學(xué):鋰離子（Li-Ion）、鋰聚合物（Li-Pol） 電源電壓:3.75 V ~ 6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:SC-74A，SOT-753 供應(yīng)商設(shè)備封裝:SOT-23-5 包裝:剪切帶 (CT) 產(chǎn)品目錄頁面:669 (CN2011-ZH PDF) 其它名稱:MCP73831T-2ACI/OTCT |
| ISL6292-1CR5Z | 功能描述:電池管理 LD VER OF ISL6292-1C R5 RoHS:否 制造商:Texas Instruments 電池類型:Li-Ion 輸出電壓:5 V 輸出電流:4.5 A 工作電源電壓:3.9 V to 17 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:VQFN-24 封裝:Reel |
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