LM2840XQMKX/NOPB

LM2841, LM2842 www.ti.com SNVS540H – MARCH 2009 – REVISED APRIL 2013 LM2840/LM2841/LM2842/ LM2840-Q1/LM2841-Q1/LM2842-Q1 100/300/600 mA 42V Input Step-Down DC/DC Regulator in Thin SOT Check for Samples: LM2841, LM2842 FEATURES DESCRIPTION • The LM2840, LM2841 and LM2842 are PWM DC/DC buck (step-down) regulators. With a wide input range from 4.5V-42V, they are suitable for a wide range of applications such as power conditioning from unregulated sources. They feature a low RDSON (0.9Ω typical) internal switch for maximum efficiency (85% typical). Operating frequency is fixed at 550 kHz (X version) and 1.25 MHz (Y version) allowing the use of small external components while still being able to have low output voltage ripple. Soft-start can be implemented using the shutdown pin with an external RC circuit allowing the user to tailor the soft-start time to a specific application. 1 2 • • • • • • • • • LM2840Q, LM2841-Q1 and LM2842-Q1 are Automotive Grade Products that are AEC-Q100 Grade 1 Qualified (-40°C to +125°C Operating Junction Temperature) Input Voltage Range of 4.5V to 42V Output Current Options of 100 mA, 300 mA and 600 mA Feedback Pin Voltage of 0.765V 550 kHz (X) or 1.25 MHz (Y) Switching Frequency Low Shutdown IQ, 16 µA Typical Short Circuit Protected Internally Compensated Soft-Start Circuitry Small Overall Solution Size (SOT-6L Package) The LM2840 is optimized for up to 100 mA, the LM2841 for 300 mA and the LM2842 is optimized for up to 600 mA load currents. They all have a 0.765V nominal feedback voltage. Additional features include: thermal shutdown, VIN under-voltage lockout, and gate drive under-voltage lockout. The LM2840, LM2841 and LM2842 are available in a low profile SOT-6L package. APPLICATIONS • • • • Battery Powered Equipment Industrial Distributed Power Applications Portable Media Players Portable Hand Held Instruments Typical Application Circuit CBOOT L1 VOUT LM2840/1/2-ADJL VIN VIN CB SHDN SW GND FB D1 R1 CIN R2 COUT 1 2 Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. All trademarks are the property of their respective owners. PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of the Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. Copyright © 2009–2013, Texas Instruments Incorporated LM2841, LM2842 SNVS540H – MARCH 2009 – REVISED APRIL 2013 www.ti.com Connection Diagram Top View LM2840/1/2 CB 1 GND 2 FB 3 PIN 1 ID 6 SW 5 VIN 4 SHDN Figure 1. SOT 6 Lead See Package Number DDC (R-PDSO-G6) PIN DESCRIPTIONS Pin Name 1 CB 2 GND 3 FB 4 SHDN Function SW FET gate bias voltage. Connect CBOOT cap between CB and SW. Ground connection. Feedback pin: Set feedback voltage divider ratio with VOUT = VFB (1+(R1/R2)). Resistors should be in the 100-10K range to avoid input bias errors. Logic level shutdown input. Pull to GND to disable the device and pull high to enable the device. If this function is not used tie to VIN or leave open. 5 VIN Power input voltage pin: 4.5V to 42V normal operating range. 6 SW Power FET output: Connect to inductor, diode, and CBOOT cap. 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. 2 Submit Documentation Feedback Copyright © 2009–2013, Texas Instruments Incorporated Product Folder Links: LM2841 LM2842 LM2841, LM2842 www.ti.com SNVS540H – MARCH 2009 – REVISED APRIL 2013 Absolute Maximum Ratings (1) (2) VIN -0.3V to +45V SHDN -0.3V to (VIN+0.3V)