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參數(shù)資料
| 型號： | LM3655TLX |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 電源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, BGA25 |
| 封裝： | 2.5 X 2.5 MM, MICRO SMD, 25 PIN |
| 文件頁數(shù)： | 18/21頁 |
| 文件大?。?/td> | 833K |
| 代理商： | LM3655TLX |
10.0 Pin Functions (Continued)
10.13 EXT_PWR_ON
EXT_PWR_ON is a digital push-pull output. A logic 1, referenced to the Radio_B+ level is output when V
cell exceeds Vphone_on
(nominally 3.00V) and CHRG_DETB = 0 (charger presence is detected) and BATT_DETB is low. Otherwise, EXT_PWR_ON is
held low to prevent the phone from attempting to turn on due to charger connection when there is either no battery present or
when the battery is not charged enough for the phone to operate.
11.0 Charge Control Functions
11.1 GENERAL OPERATION
The LM3655 circuit is able to operate with different types of charge power supplies with a wide range of input voltage and
currents, including but not limited to unregulated current limited wall adapters, regulated wall adapters and Vehicle Power
Adapters with 1A of current limit.
The IC protects itself from high voltages by using Q1 and Q2 to stand off these voltages. It also uses resistors to current limit the
V
DETECT pin. High currents are handled by using current regulation during both the full-rate and the trickle/top-off phases of
charging the battery. Power dissipation in Q1 is controlled using a constant-power control circuit within the IC.
The LM3655 has multiple modes of operation for charging and protecting the embedded cell. The three basic modes of operation
are low voltage charging, full-rate charging, and trickle charging. During the charge process, the power dissipation in the pass
element Q1 is monitored and controlled to a safe maximum limit by reducing charge current as necessary.
Because of quantization error or power supply voltage fluctuations, the power-limiting circuit may (in some cases) reduce cell
current to a level lower than necessary for extended periods of time. To counteract this, the IC periodically activates a charger test
pulse during the full-rate and trickle charging modes. This allows the power supply to deliver full-rate current, although the cell
voltage is always regulated such that it does not exceed the termination voltage (4.10V or 4.16V as determined by the
CHEMISTRY pin). The test pulse allows the cell to be charged at the fastest possible rate by allowing the charge control to
re-enter the full-rate charge (Q1 saturated) mode whenever possible. The test pulses are enabled during full-rate and trickle/
top-off charge modes, have a nominal duration of 256 mS, and are repeated every 64 seconds. This is referred to as ‘burp’ mode.
Figure 1 shows the cell voltage thresholds used in the selection of the charging modes. The horizontal (time) axis is intended to
illustrate the progression of a complete charge/discharge cycle of operation.
11.2 EXTERNAL POWER SUPPLY DETECT
11.2.1 V
DETECT Circuit
The V
DETECT circuit is used to determine the presence of an external charger. The equivalent circuit is illustrated below.
20111504
FIGURE 1. Voltage Thresholds
LM3655
www.national.com
6
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相關代理商/技術參數(shù) |
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|---|---|
| LM3658 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Dual Source USB/AC Li Chemistry Charger IC for Portable Applications |
| LM3658SD | 功能描述:電池管理 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 |
| LM3658SD/NOPB | 功能描述:電池管理 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 |
| LM3658SD-A | 制造商:Texas Instruments 功能描述:Battery Charger Li-Ion/Li-Pol 0mA to 1000mA 4.2V 10-Pin LLP EP T/R 制造商:Texas Instruments 功能描述:BATT CHARGER, LI ION USB/AC, LLP-10 制造商:Texas Instruments 功能描述:Dual Source USB/AC Li Charger,LM3658SD-A |
| LM3658SD-A/NOPB | 功能描述:電池管理 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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