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參數(shù)資料
| 型號(hào)： | MAX4840EXT-T |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 電源管理 |
| 英文描述： | Overvoltage Protection Controllers with Status FLAG |
| 中文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO6 |
| 封裝： | SC-70, 6 PIN |
| 文件頁(yè)數(shù)： | 7/10頁(yè) |
| 文件大小： | 227K |
| 代理商： | MAX4840EXT-T |
M
Overvoltage Protection Controllers with
Status FLAG
_______________________________________________________________________________________
7
Applications Information
MOSFET Configuration
The MAX4838
–
MAX4841 can be used with either a sin-
gle 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 MAX4838
–
MAX4841 can drive either a single
MOSFET or back-to-back MOSFETs. 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 MAX4838
–
MAX4841 are designed for use with
either a single N-channel MOSFET or dual back-to-
back N-channel MOSFETs. In most situations,
MOSFETs with R
DS(ON)
specified for a V
GS
of 4.5V
work well. If the input supply is near the UVLO maxi-
mum of 3.5V consider using a MOSFET specified for a
lower V
GS
voltage. Also the V
DS
should be 30V for the
MOSFET to withstand the full 28V IN range of the
MAX4838
–
MAX4841.
Table
1 shows a selection of
MOSFETs appropriate for use with the MAX4838
–
MAX4841.
IN Bypass Considerations
For most applications, bypass IN to GND with a 1μF
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 MAX4838
–
MAX4841 provide protection against volt-
age faults up to 28V, but this does not include negative
voltages. If negative voltages are a concern, 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 MAX4838
–
MAX4841 are specified for 15kV typical
ESD resistance on IN when IN is bypassed to ground
with a 1μF ceramic capacitor. Contact Maxim for a reli-
ability report that documents test setup, methodology,
and results.
TIMER STARTS
COUNTING
t = 50ms
t = 50ms
V
IN
< UVLO
V
IN
> UVLO
V
IN
< OVLO
V
IN
> 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
MAX4838
–
MAX4841
INPUT
0 TO 28V
IN
EN
GATE
FLAG
GND
1
6
4
2
3
OUTPUT
NMOS
V
IO
1
μ
F
NOTE: EN AND PULLUP
RESISTOR ON MAX4838/
MAX4840 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(fēng)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(shí)間（最大值）:400 us 關(guān)閉時(shí)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(fēng)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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