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LM25066PSQX bảng dữ liệu(PDF) 4 Page - Texas Instruments |
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LM25066PSQX bảng dữ liệu(HTML) 4 Page - Texas Instruments |
4 / 63 page LM25066 SNVS654J – FEBRUARY 2010 – REVISED DECEMBER 2015 www.ti.com Pin Functions (continued) PIN TYPE DESCRIPTION NO. NAME An external capacitor connected to this pin sets the insertion time delay, fault timeout 9 TIMER Timing capacitor period and restart timing. An external resistor connected to this pin, in conjunction with the current sense resistor 10 PWR Power limit set (RS), sets the maximum power dissipation allowed in the external series pass MOSFET. An open drain output. This output is high when the voltage at the FB pin is above 1.167 V and the input supply is within its undervoltage and overvoltage thresholds. Connect via a 11 PGD POWER GOOD indicator pullup resistor to the output rail (external MOSFET source) or any other voltage to be monitored. Connect to the output rail (external MOSFET source). Internally used to determine the 12 OUT Output feedback MOSFET VDS voltage for power limiting, and to monitor the output voltage. 13 GATE Gate drive output Connect to the external MOSFET's gate. The voltage across the current sense resistor (RS) is measured from VIN to this pin. If the 14 SENSE Current sense input voltage across RS reaches overcurrent threshold, the load current is limited and the fault timer activates. A small ceramic bypass capacitor close to this pin is recommended to suppress transients 15 VIN Positive supply input which occur when the load current is switched off. An external resistor divider from the system input voltage sets the undervoltage turnon 16 UVLO/EN Undervoltage lockout threshold. An internal 23-µA current source provides hysteresis. The enable threshold at the pin is 1.16 V. This pin can also be used for remote shutdown control. An external resistor divider from the system input voltage sets the overvoltage turnoff 17 OVLO Overvoltage lockout threshold. An internal 23-µA current source provides hysteresis. The disable threshold at the pin is 1.16 V. 18 GND Circuit ground – Data pin for SMBus. Open-drain output, requires external pullup resistor to Vdd or other 19 SDA SMBus data pin voltage source. Clock pin for SMBus. Open-drain output, requires external pullup resistor to Vdd or other 20 SCL SMBus clock voltage source. Alert pin for SMBus; active low. Open-drain output, requires external pullup resistor to Vdd 21 SMBA SMBus alert line or other voltage source. Internally generated precision 2.73-V reference used for analog to digital conversion. 22 VREF Internal reference Connect a 1-µF capacitor on this pin to ground for bypassing. Connect this to a diode-configured NPN transistor for temperature monitoring. Connect to 23 DIODE External diode ground if unused. 24 VAUX Auxiliary voltage input Auxiliary pin allows voltage telemetry from an external source. Full scale input of 1.16 V. Exposed Exposed pad of WQFN No internal electrical connections. Solder to the ground plane to reduce thermal – Pad package resistance. 4 Submit Documentation Feedback Copyright © 2010–2015, Texas Instruments Incorporated Product Folder Links: LM25066 |
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