Texas Instruments LM61480

Description

The LM6x4xx family of buck regulators are regulators that provide either fixed or adjustable output voltage that can be set from 1 V to 95% of expected input voltage. These regulators operate under a wide input voltage range or 3 V to 36 V and have transient tolerance up to 42 V.The family is designed for low EMI. The devices incorporate pin-selectable spread spectrum and an adjustable SW node rise time. Dual Random Spread Spectrum (DRSS) frequency hopping is set to ±5.5% (typical), drastically reducing peak emissions through a combination of triangular and pseudo random modulation. DRSS also includes advanced techniques to reduce output voltage ripple caused by spread spectrum modulation.An open-drain RESET output with filtering and delayed release gives a true indication of system status. In auto mode, the device automatically transitions between fixed-frequency pulse width modulation (FPWM) and pulse frequency modulation (PFM) modes of operation, allowing an unloaded current consumption of only 5 µA (typical). Electrical characteristics are specified over a junction temperature range of –40°C to +150°C.

Features

Functional Safety-CapableDocumentation available to aid functional safety system designInput voltage range from 3 V to 36 VRESET output with filter and delayed releaseDesigned for low EMI:CISPR 11/32 class B compliant EVMPin-configurable spread spectrumAdjustable SW node rise timeAbove and below AM band operation: pin configurable at fixed 400 kHz and 2.2 MHz or adjustable from 200 kHz – 2.2 MHzLow EMI symmetrical pinoutLight load mode is pin-configurable for constant frequency or pulse frequency modulation (PFM)High-efficiency solution95% efficient for an 8-A load5-µA input current while unloaded in auto mode<1-µA shutdown current (typical)High power densityBuilt-in compensation, soft start, current limit, thermal shutdown, and UVLO4.5-mm × 3.5-mm wettable flank QFN package

Typical applications

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