LM2842 Datasheet | Texas Instruments

Features - 1 Input voltage 4.5 V to 42 V - Output current options of 100 m A, 300 m A, and 600 m A - Feedback pin voltage of 0.765 V - 550-k Hz (X) or 1.25-MHz (Y) switching frequency - Low shutdown IQ: 16-µA typical - Short-circuit protected - Internally pensated - Soft-start circuitry - Small overall solution size (SOT-6L package) - Create a custom design using the LM2840 (or LM2841/42) with the WEBENCH® Power Designer 2 Applications - Battery-powered equipment - Industrial distributed power applications - Portable media players - Portable hand-held instruments 3 Description The LM284x SIMPLE SWITCHER™ devices are PWM DC/DC buck (step-down) regulators. With an input range from 4.5 V to 42 V, they are suitable for a wide range of applications, such as power conditioning from unregulated sources. They feature a low RDSON (0.9‑Ω typical) internal switch for maximum efficiency (85% typical). Operating frequency is fixed at 550 k Hz (X option) and 1.25 MHz (Y option), allowing the use of small external ponents while still being able to have low output voltage ripple. Soft start can be implemented using the shutdown (SHDN) pin with an external RC circuit allowing the user to tailor the soft-start time to a specific application. The LM2840 is optimized for up to 100 m A, the LM2841 for up to 300 m A, and the LM2842 for up to 600‑m A load currents. They all have a 0.765-V nominal feedback voltage. Additional features include: thermal shutdown, VIN undervoltage lockout, and gate-drive undervoltage lockout. The LM284x are available in a low-profile SOT-6L package. Device Information(1) PART NUMBER PACKAGE BODY SIZE (NOM) LM2840, LM2841, LM2842 SOT (6) 1.60 mm × 2.90 mm (1) For all available packages, see the orderable addendum at the end of the data sheet. Typical Application Circuit CBOOT L1 VOUT VIN CIN LM2840/1/2-ADJL D1 SHDN...