Datasheet LTC4362-1, LTC4362-2 (Analog Devices)
| Fabricante | Analog Devices |
| Descripción | 1.2A Overvoltage/Overcurrent Protector |
| Páginas / Página | 14 / 1 — FEATURES. DESCRIPTION. 2.5V to 5.5V Operation. Overvoltage Protection Up … |
| Revisión | B |
| Formato / tamaño de archivo | PDF / 649 Kb |
| Idioma del documento | Inglés |
FEATURES. DESCRIPTION. 2.5V to 5.5V Operation. Overvoltage Protection Up to 28V. Internal 40mΩ N-Channel MOSFET and 31mΩ RSENSE
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LTC4362-1/LTC4362-2 1.2A Overvoltage/Overcurrent Protector
FEATURES DESCRIPTION
n
2.5V to 5.5V Operation
The LTC®4362 monolithic overvoltage/overcurrent protec- n
Overvoltage Protection Up to 28V
tor safeguards 2.5V to 5.5V systems from power supply n
Internal 40mΩ N-Channel MOSFET and 31mΩ RSENSE
overvoltage. It is designed for portable devices with mul- n
Avalanche Rated MOSFET Requires No Input
tiple power supply options including wall adaptors, car
Capacitor or TVS for Most Applications
battery adaptors and USB ports. n <
1µs Overvoltage Turn-Off, Gentle Shutdown
The LTC4362 controls an internal 40mΩ N-channel n 2% Accurate 5.8V Overvoltage Threshold MOSFET in series with the input power supply. During n 20% Accurate 1.5A Overcurrent Threshold overvoltage transients, the LTC4362 turns off the MOSFET n Input Withstands Up to ±25kV HBM ESD with within 1µs, isolating downstream components from the ≥1µF COUT input supply. In most applications, the LTC4362 rides n Controlled Power-Up dV/dt Limits Inrush Current through inductive cable transients without requiring tran- n Reverse Voltage Protection Driver sient voltage suppressors or other external components. n Low Current Shutdown An internal current sense resistor is used to implement n Latchoff (LTC4362-1) or Auto-Retry (LTC4362-2) overcurrent protection. After Overcurrent n Available in 8-Lead DFN 2mm × 3mm Package The LTC4362 has a delayed start-up at plug-in and controlled dV/dt ramp-up for inrush current limiting. A
APPLICATIONS
PWRGD pin provides power good monitoring for VIN. The n LTC4362 features a soft-shutdown controlled by the ON USB Protection n pin and drives an optional external P-channel MOSFET Handheld Computers n for negative voltage protection. Following an overvolt- Cell/Smart Phones n age condition, the LTC4362 automatically restarts with a MP3/MP4 Players n 130ms delay. After an overcurrent fault, the LTC4362-1 Digital Cameras remains off while the LTC4362-2 automatically restarts All registered trademarks and trademarks are the property of their respective owners. after a 130ms delay.
TYPICAL APPLICATION Protection from Overvoltage and Overcurrent Output Protected from Overvoltage at Input
V V OUT V IN IN IN OUT 5V 5V 0.5A C LTC4362 OUT ON PWRGD GND VOUT 436212 TA01a VIN, VOUT 5V/DIV 0.2µs/DIV 436212 TA01b COUT = 10µF Rev. B Document Feedback For more information www.analog.com 1 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings order information Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Package Description Revision History Typical Application Related Parts
FEATURES DESCRIPTION
n
2.5V to 5.5V Operation
The LTC®4362 monolithic overvoltage/overcurrent protec- n
Overvoltage Protection Up to 28V
tor safeguards 2.5V to 5.5V systems from power supply n
Internal 40mΩ N-Channel MOSFET and 31mΩ RSENSE
overvoltage. It is designed for portable devices with mul- n
Avalanche Rated MOSFET Requires No Input
tiple power supply options including wall adaptors, car
Capacitor or TVS for Most Applications
battery adaptors and USB ports. n <
1µs Overvoltage Turn-Off, Gentle Shutdown
The LTC4362 controls an internal 40mΩ N-channel n 2% Accurate 5.8V Overvoltage Threshold MOSFET in series with the input power supply. During n 20% Accurate 1.5A Overcurrent Threshold overvoltage transients, the LTC4362 turns off the MOSFET n Input Withstands Up to ±25kV HBM ESD with within 1µs, isolating downstream components from the ≥1µF COUT input supply. In most applications, the LTC4362 rides n Controlled Power-Up dV/dt Limits Inrush Current through inductive cable transients without requiring tran- n Reverse Voltage Protection Driver sient voltage suppressors or other external components. n Low Current Shutdown An internal current sense resistor is used to implement n Latchoff (LTC4362-1) or Auto-Retry (LTC4362-2) overcurrent protection. After Overcurrent n Available in 8-Lead DFN 2mm × 3mm Package The LTC4362 has a delayed start-up at plug-in and controlled dV/dt ramp-up for inrush current limiting. A
APPLICATIONS
PWRGD pin provides power good monitoring for VIN. The n LTC4362 features a soft-shutdown controlled by the ON USB Protection n pin and drives an optional external P-channel MOSFET Handheld Computers n for negative voltage protection. Following an overvolt- Cell/Smart Phones n age condition, the LTC4362 automatically restarts with a MP3/MP4 Players n 130ms delay. After an overcurrent fault, the LTC4362-1 Digital Cameras remains off while the LTC4362-2 automatically restarts All registered trademarks and trademarks are the property of their respective owners. after a 130ms delay.
TYPICAL APPLICATION Protection from Overvoltage and Overcurrent Output Protected from Overvoltage at Input
V V OUT V IN IN IN OUT 5V 5V 0.5A C LTC4362 OUT ON PWRGD GND VOUT 436212 TA01a VIN, VOUT 5V/DIV 0.2µs/DIV 436212 TA01b COUT = 10µF Rev. B Document Feedback For more information www.analog.com 1 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings order information Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Package Description Revision History Typical Application Related Parts