LM67660 datasheet(28/66 Pages) TI2

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• No fault conditions are present.

See Section 7.3.11 for protection features. The simplest way to enable the operation is to connect EN/UVLO to

VIN, allowing start-up when the applied input voltage exceeds the VINUVLO(R) of 3.4V (typical).

In active mode, the LM65680/60/40 is in one of six sub-modes depending on the load current, input voltage, and

output voltage:

• Continuous conduction mode (CCM) with fixed switching frequency and peak current-mode operation

• Discontinuous conduction mode (DCM) while in AUTO mode when the load current is less than half

of the inductor peak-to-peak ripple current. If the current continues to reduce, the device enters Pulse

Frequency Modulation (PFM) mode, which reduces the switching frequency to maintain regulation (this

reduces switching losses, thus achieving higher efficiency at light loads).

• Minimum on-time operation while the on-time of the device needed for full-frequency operation at the

requested low-duty cycle is not supported by tON(min)

• Forced pulsewidth modulation (FPWM) similar to CCM with fixed-switching frequency, but extends the fixed

frequency range of operation from full to no load.

• A current-limiting condition where the output voltage remains above 40% of the output setpoint.

• Dropout mode when the switching frequency reduces to minimize dropout.

• Recovery from dropout – similar to other modes of operation except the output voltage setpoint is gradually

moved up until the programmed setpoint is reached.

LM65680

SNVSCF2 – NOVEMBER 2025

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LM67660 Datasheet(PDF) 28 Page - Texas Instruments