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參數(shù)資料
| 型號： | MAX4920BETD+T |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 3/19頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC CTLR OVP/OCP BATT PWR 14-TDFN |
| 產(chǎn)品培訓模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標準包裝： | 2,500 |
| 類型： | 過壓和過流控制器 |
| 應用： | 手機，數(shù)碼相機，媒體播放器 |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 14-WFDFN 裸露焊盤 |
| 供應商設備封裝： | 14-TDFN-EP（3x3） |
| 包裝： | 帶卷 (TR) |
Note that upon VBTI falling below the 2.15V (min) thresh-
old, the internal switch remains off, irrespective of the
control signals at HP_PWR, PWR_ON, or PWR_HOLD.
Thermal Shutdown
The MAX4919B/MAX4920B/MAX4921B feature thermal
shutdown circuitry. The internal 1.8A (min) switch turns
off when the junction temperature exceeds +135°C and
immediately goes into a fault mode. The device can be
reset upon the junction temperature dropping below
+125°C. Before P2 can be turned on again, any condi-
tion that is attempting to turn it on must be first removed,
i.e., the one-shot (from IN or HP_PWR) must be complet-
ed, and PWR_ON and PWR_HOLD must be low. If the
three conditions are satisfied, P2 turns on again only if
either IN or PWR_HOLD is cycled OFF and ON.
Applications Information
MOSFET Configuration
The MAX4919B/MAX4920B/MAX4921B can drive either a
single n-channel or back-to-back n-channel MOSFET
(Figure 10). The back-to-back configuration will have
almost zero reverse current when the adapter is not pre-
sent or when the adapter voltage is below the undervolt-
age lockout threshold.
If reverse-current leakage is not a concern, a single
n-channel MOSFET can be used. This approach has
half the loss of the back-to-back configuration when
used with similar MOSFET types and is a lower cost
solution. Note that if the input is actually pulled low, the
output will be pulled low as well due to the parasitic
body diode in the MOSFET. If this is a concern, then
use the back-to-back configuration.
MAX4919B/MAX4920B/MAX4921B
Battery Power-Up Logic with Overvoltage
and Overcurrent Protection
______________________________________________________________________________________
11
UVLO
OVLO
IN
PWR_HOLD
STATUS
ACOK
ADAPTER
VOLTAGE
ACOK
ONE-SHOT
P2
OFF
ON
25ms DEBOUNCE PERIOD
1.2s
ONE-SHOT
PERIOD
OFF
Figure 7. MAX4919B/MAX4920B/MAX4921B Power_Hold Waveform When Voltage at IN is Present
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| MAX4921BETD+ | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| MAX4921BETD+T | 功能描述:電池管理 Battery Power-Up Logic 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 |
| MAX4924ELT+T | 功能描述:開關變換器、穩(wěn)壓器與控制器 Overvoltage Protector RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關頻率:1 MHz 工作溫度范圍: 安裝風格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
| MAX4925ELT+ | 制造商:Maxim Integrated Products 功能描述:OVP PROTECTOR WITH EXTERNAL PFET - Bulk |
| MAX4925ELT+T | 功能描述:開關變換器、穩(wěn)壓器與控制器 Overvoltage Protector RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關頻率:1 MHz 工作溫度范圍: 安裝風格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
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