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參數(shù)資料
| 型號： | MAX6399 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | High-Voltage, Overvoltage/Undervoltage, Protection Switch Controller |
| 中文描述： | 高壓、過壓/欠壓保護開關(guān)控制器 |
| 文件頁數(shù)： | 5/10頁 |
| 文件大?。?/td> | 649K |
| 代理商： | MAX6399 |
Detailed Description
The MAX6399 is an ultra-small, low-current protection
circuit utilized in DC-DC converter applications. The
MAX6399 monitors the input and output voltages of a
DC-DC converter for undervoltage and overvoltage
conditions. The MAX6399 controls an external n-chan-
nel MOSFET to isolate the load during an overvoltage
condition. The device allows system designers to size
the external n-channel MOSFET to their load current
and board size.
The MAX6399 drives the MOSFET’s gate high when the
monitored DC-DC output voltage is below the program-
mable overvoltage threshold, programmed through
SET. An internal charge-pump circuit provides a guar-
anteed 10V gate-to-source drive to ensure low input-to-
load voltage drops in normal operating modes. When
the monitored DC-DC output voltage rises above the
user-adjusted overvoltage threshold, GATE latches low,
turning off the MOSFET. The MOSFET remains off until
the power is recycled or by toggling
SHDN
.
The MAX6399 also monitors for an undervoltage condi-
tion at the input of the DC-DC converter through
OUT_SET. An active-high, open-drain, power-good out-
put can be used to drive the EN input, notifying the sys-
tem when the monitored voltage is below the adjusted
undervoltage voltage threshold.
M
High-Voltage, Overvoltage/Undervoltage,
Protection Switch Controller
_______________________________________________________________________________________
5
PIN
1
NAME
IN
FUNCTION
Supply Voltage Input. Bypass with a 10μF capacitor (minimum).
Shutdown Input. Drive
SHDN
low to force GATE low, turning off the external n-channel MOSFET.
SHDN
is
internally pulled down to GND with a 1μA current source. Toggle
SHDN
to unlatch GATE after an
overvoltage condition. Connect to IN for normal operation.
Overvoltage Threshold Adjustment Input. Use SET to monitor a system output voltage. Connect SET to an
external resistor voltage-divider network to adjust the desired overvoltage limit threshold. GATE is quickly
turned off when SET rises above its 0.5V (typ) threshold.
Power-OK Open-Drain Output. POK asserts low when OUT_SET falls below its 1.23V (typ) threshold.
Ground
Gate-Drive Output. Connect GATE to the gate of an external n-channel FET. GATE is a charge pump with a
100μA pullup current to IN + 10V (typ) during normal operation. GATE is quickly turned off during an
overvoltage condition. GATE remains latched off until the power is recycled or
SHDN
is toggled. GATE pulls
low when
SHDN
is low.
Output Voltage-Sense Input. Connect to the source of the external n-channel MOSFET.
Undervoltage Detector Input. Use OUT_SET to monitor the source of the MOSFET. Connect a
resistor-divider from OUT to OUT_SET to adjust the desired undervoltage threshold. POK asserts low
when OUT_SET falls below its 1.23V threshold.
Exposed Pad. Connect to ground plane.
2
SHDN
3
SET
4
5
POK
GND
6
GATE
7
OUT
8
OUT_SET
—
EP
Pin Description
MAX6399
UVLO
5V
0.5V
CHARGE
PUMP
IN
GATE
OUT
POK
GND
SET
1.23V
OUT_SET
THERMAL
PROTECTION
SHDN
Figure 1. Functional Diagram
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|---|---|
| MAX6399ATA | 制造商:Maxim Integrated Products 功能描述:OVERVOLTAGE PROTECTION SWITCH LIMIT - Rail/Tube 制造商:Rochester Electronics LLC 功能描述: |
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| MAX6399ATA-T | 功能描述:監(jiān)控電路 RoHS:否 制造商:STMicroelectronics 監(jiān)測電壓數(shù): 監(jiān)測電壓: 欠電壓閾值: 過電壓閾值: 輸出類型:Active Low, Open Drain 人工復(fù)位:Resettable 監(jiān)視器:No Watchdog 電池備用開關(guān):No Backup 上電復(fù)位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel |
| MAX639C/D | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 5V/3.3V/3V Adjustable High-Efficiency Low-IQ Step-Down DC-DC Converters RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT |
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