參數(shù)資料
型號(hào)： MAX4845
廠商： Maxim Integrated Products, Inc.
英文描述： Overvoltage Protection Controllers with Low Standby Current
中文描述： 過(guò)壓保護(hù)控制器，具有低待機(jī)電流
文件頁(yè)數(shù)： 1/9頁(yè)
文件大小： 296K
代理商： MAX4845
General Description
The MAX4843–MAX4846 overvoltage protection con-
trollers protect low-voltage systems against high-voltage
faults of up to 28V. When the input voltage exceeds the
overvoltage threshold, these devices turn off a low-cost,
external n-channel FET(s) to prevent damage to the pro-
tected components. An internal charge pump eliminates
the need for external capacitors and drives the FET gate
for a simple, robust solution.
The overvoltage trip level is set to 7.4V (MAX4843),
6.35V (MAX4844), 5.8V (MAX4845), or 4.65V
(MAX4846). When the input voltage drops below the
undervoltage lockout (UVLO) threshold, the devices
enter a low standby current mode (10μA). The
MAX4843/MAX4844/ MAX4845 have a UVLO threshold
of 4.15V, and the MAX4846 has a UVLO threshold of
2.5V. In addition to the single FET configuration, the
devices can be configured with back-to-back external
FETs to prevent currents from being back-driven into the
adapter.
An additional feature includes a ±15kV ESD-protected
input when bypassed with a 1μF capacitor to ground. All
devices are offered in a small (1.5mm x 1.0mm) 6-pin
μDFN package and are specified for operation over the
-40°C to +85°C temperature range.
Applications
Cell Phones
Digital Still Cameras
PDAs and Palmtop Devices
MP3 Players
Features
o
Overvoltage Protection Up to 28V
o
Preset 7.4V, 6.35V, 5.8V, or 4.65V Overvoltage Trip
Level
o
Low (10μA) Undervoltage Lockout Standby
Current
o
Drives Low-Cost n MOSFET
o
Internal 50ms Startup Delay
o
Internal Charge Pump
o
Overvoltage Fault FLAG Indicator
o
6-Pin (1.5mm x 1.0mm) μDFN Package
M
Overvoltage Protection Controllers with
Low Standby Current
________________________________________________________________
Maxim Integrated Products
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
1
GND
GATE
FLAG
1
6
N.C.
5
N.C.
IN
MAX4843–
MAX4846
μ
DFN
TOP VIEW
2
3
4
PART
*
PIN-
PACKAGE
UVLO
(V)
OVLO
(V)
TOP
MARK
MAX4843
ELT
MAX4844
ELT
MAX4845
ELT
MAX4846
ELT
*
All devices are specified over the -40°C to +85°C temperature
range.
6 μDFN
6 μDFN
6 μDFN
6 μDFN
4.15
4.15
4.15
2.50
7.40
6.35
5.80
4.65
BE
BF
BG
BH
Pin Configuration
Ordering Information
MAX4843
–
MAX4846
4
OUTPUT
GATE
FLAG
V
IO
N
3
1
IN
2GND
INPUT
+1.2V TO +28V
1
μ
F
Typical Operating Circuit
19-3649; Rev 0; 4/05
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MAX4845CEYT+ 功能描述:電流和電力監(jiān)控器、調(diào)節(jié)器 Overvoltage Protect Controller 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
MAX4845CEYT+T 功能描述:電流和電力監(jiān)控器、調(diào)節(jié)器 Overvoltage Protect Controller 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
MAX4845DEYT+ 功能描述:電流和電力監(jiān)控器、調(diào)節(jié)器 Overvoltage Protect Controller 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
MAX4845DEYT+T 功能描述:電流和電力監(jiān)控器、調(diào)節(jié)器 Overvtg Protct Cntlr w/ Lo Standby Crnt 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
MAX4845DEYT+TW 功能描述:電流和電力監(jiān)控器、調(diào)節(jié)器 Overvoltage Protect Controller 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
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