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參數(shù)資料
| 型號： | MAX4840EXT+T |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 9/11頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC CTLR OVP 5.8V SC70-6 |
| 產(chǎn)品培訓模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標準包裝： | 1 |
| 類型： | 過壓保護控制器 |
| 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： | 6-TSSOP，SC-88，SOT-363 |
| 供應商設(shè)備封裝： | SC-70-6 |
| 包裝： | 標準包裝 |
| 產(chǎn)品目錄頁面： | 1423 (CN2011-ZH PDF) |
| 其它名稱： | MAX4840EXT+TDKR |
MAX4838A/MAX4840A/MAX4842A
Overvoltage-Protection Controllers with
Status
FLAG
_______________________________________________________________________________________
7
Applications Information
MOSFET Configuration
The MAX4838A/MAX4840A/MAX4842A can be used
with either a single MOSFET configuration as shown in
the Typical Operating Circuit, or can be configured with
a back-to-back MOSFET as shown in Figure 7. The
back-to-back configuration has almost zero reverse
current when the input supply is below the output.
If reverse current leakage is not a concern, a single
MOSFET can be used. This approach has half the loss
of the back-to-back configuration when used with simi-
lar MOSFET types, and is a lower cost solution. Note
that if the input is actually pulled low, the output is
pulled low as well due to the parasitic body diode in the
MOSFET. If this is a concern, then the back-to-back
configuration should be used.
MOSFET Selection
The MAX4838A/MAX4840A/MAX4842A are designed for
use with either a single n-channel MOSFET or dual back-
to-back n-channel MOSFETs. In most situations,
MOSFETs with RDS(ON) specified for a VGS of 4.5V work
well. If the input supply is near the UVLO maximum of
3.5V, consider using a MOSFET specified for a lower
VGS voltage. Also, the VDS should be 30V for the MOS-
FET to withstand the full 28V IN range of all devices.
Table 1 shows a selection of MOSFETs appropriate for
use with the MAX4838A/MAX4840A/MAX4842A.
IN Bypass Considerations
For most applications, bypass IN to GND with a 1F
ceramic capacitor. If the power source has significant
inductance due to long lead length, take care to pre-
vent overshoots due to the LC tank circuit and provide
protection if necessary to prevent exceeding the 30V
absolute maximum rating on IN.
The MAX4838A/MAX4840A/MAX4842A provide protec-
tion against voltage faults up to 28V, but this does not
include negative voltages. If negative voltages are a con-
cern, connect a Schottky diode from IN to GND to clamp
negative input voltages.
ESD Test Conditions
ESD performance depends on a number of conditions.
The MAX4838A/MAX4840A/MAX4842A are specified
for ±15kV typical ESD resistance on IN when IN is
bypassed to ground with a 1F ceramic capacitor.
Contact Maxim for a reliability report that documents
test setup, methodology, and results.
Human Body Model
Figure 8 shows the Human Body Model, and Figure 9
shows the current waveform it generates when dis-
charged into a low impedance. This model consists of
a 100pF capacitor charged to the ESD voltage of inter-
est, which is then discharged into the device through a
1.5k
resistor.
TIMER STARTS
COUNTING
t = 50ms
VIN < UVLO
VIN > UVLO
VIN < OVLO
VIN > OVLO
STANDBY
GATE = 0
FLAG = LOW
OVLO CHECK
GATE = 0
FLAG = LOW
STARTUP
GATE DRIVEN HIGH
FLAG = LOW
ON
GATE HIGH
FLAG = HIGH
Figure 6. State Diagram
MAX4838A
MAX4840A
MAX4842A
INPUT
0 TO 28V
IN
EN
GATE
FLAG
GND
1
6
4
2
3
OUTPUT
NMOS
VIO
1
F
NOTE: EN AND PULLUP
RESISTOR ON MAX4838A/
MAX4840A/MAX4842A ONLY.
Figure 7. Back-to-Back External MOSFET Configuration
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX4841EXT | 制造商:Maxim Integrated Products 功能描述:OVERVOLTAGE PROTECTION CONTROLLERS - Rail/Tube 制造商:Rochester Electronics LLC 功能描述: |
| MAX4841EXT+ | 制造商:Maxim Integrated Products 功能描述:OVERVOLT PROT CNTRLR 6PIN SC-70 - Cut Tape Product |
| MAX4841EXT+T | 功能描述:電流和電力監(jiān)控器、調(diào)節(jié)器 Over V Protection Cntlr w/Status FLAG RoHS:否 制造商:STMicroelectronics 產(chǎn)品:Current Regulators 電源電壓-最大:48 V 電源電壓-最小:5.5 V 工作溫度范圍:- 40 C to + 150 C 安裝風格:SMD/SMT 封裝 / 箱體:HPSO-8 封裝:Reel |
| MAX4841EXT-T | 功能描述:電源開關(guān) IC - 配電 RoHS:否 制造商:Exar 輸出端數(shù)量:1 開啟電阻（最大值）:85 mOhms 開啟時間（最大值）:400 us 關(guān)閉時間（最大值）:20 us 工作電源電壓:3.2 V to 6.5 V 電源電流（最大值）: 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:SOT-23-5 |
| MAX4842AELT+ | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
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