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LMR61428XMM-NOPB Datasheet(PDF) 3 Page - Texas Instruments |
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LMR61428XMM-NOPB Datasheet(HTML) 3 Page - Texas Instruments |
3 / 16 page LMR61428 www.ti.com SNVS815 – JUNE 2012 Pin Description (continued) Pin Name Function 3 FREQ Frequency Adjust. An external resistor connected between this pin and Pin 6 (VDD) sets the switching frequency of the LMR61428. 4 FB Output Voltage Feedback 5 SGND Signal Ground 6 VDD Power Supply for Internal Circuitry 7 BOOT Bootstrap Supply for the Gate Drive of Internal MOSFET Power Switch 8 SW Drain of the Internal MOSFET Power Switch These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates. Absolute Maximum Ratings (1) SW Pin Voltage −0.5 V to 14.5V BOOT, VDD, EN and FB Pins −0.5V to 10V FREQ Pin 100µA θJA (2) 240°C/W TJmax (2) 150°C Storage Temperature Range −65°C to +150°C Lead Temp. (Soldering, 5 sec) 260°C Power Dissipation (TA=25°C) (2) 500mW ESD Rating (3) 2kV (1) Absolute maximum ratings indicate limits beyond which damage to the device may occur. Electrical specifications do not apply when operating the device outside of its rated operating conditions. (2) The maximum power dissipation must be derated at elevated temperatures and is dictated by Tjmax (maximum junction temperature), θJA (junction to ambient thermal resistance), and TA (ambient temperature). The maximum allowable power dissipation at any temperature is Pdmax = (Tjmax - TA)/ θJA or the number given in the Absolute Maximum Ratings, whichever is lower. (3) The human body model is a 100 pF capacitor discharged through a 1.5 k Ω resistor into each pin. For Pin 8 (SW) the ESD rating is 1.5 kV. Operating Conditions (1) VDD Pin 2.5V to 5V FB, EN Pins 0 to VDD BOOT Pin 0 to 10V Ambient Temperature (TA) −40°C to +85°C (1) Absolute maximum ratings indicate limits beyond which damage to the device may occur. Electrical specifications do not apply when operating the device outside of its rated operating conditions. Copyright © 2012, Texas Instruments Incorporated Submit Documentation Feedback 3 Product Folder Links: LMR61428 |
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