42V, 3.5A Synchronous Step-Down Regulator with 2.5μA Quiescent Current

The LT8610A/LT8610AB series are compact, high efficiency, high speed synchronous monolithic step-down switching regulators that consume only 2.5μA of quiescent current. Compared to the LT8610, they have higher maximum output currents of 3.5A and a faster minimum switch-on time of 30ns. The LT8610A has the same low ripple burst mode performance of the LT8610, while the LT8610AB has even higher light load efficiency.

The other features of the LT8610 remain unchanged in the LT8610A/LT8610AB series. A SYNC pin allows synchronization to an external clock. The EN/UV pin has an accurate 1V threshold for VIN undervoltage lockout or shut down. A capacitor on the TR/SS pin programs the output voltage ramp rate during startup. The PG flag signals when VOUT is within ±9% of the programmed output voltage as well as fault conditions.

FEEDBACK VOLTAGE

MIN VIN

OUTPUT CURRENT

NOTES

LT8610AC-1

0.80V

3.0V

3.5A

Fsw = 1.5MHz to 2.2MHz, Optimized Transient Response

LT8610AC

0.80V

3.0V

3.5A

Fsw = 200kHz to 2.2MHz

LT8610AB

0.97V

3.4V

3.5A

Improved Burst Mode Efficiency

LT8610AX

0.97V

3.4V

3.5A

175°C Max Junction Temp

LT8610A

0.97V

3.4V

3.5A

Higher Iout, 30ns Min On Time

LT8610

0.97V

3.4V

2.5A

-

Applications

* Automotive and Industrial Supplies

* GSM Power Supplies

* LT8610 Feature Set, Plus:

* 3.5A Maximum Output Current Fast

* 30ns Minimum Switch-On Time

* Improved Burst Mode Efficiency (LT8610AB Only)

* Improved EMI

* Wide Input Voltage Range: 3.4V to 42V

* Ultralow Quiescent Current Burst Mode® Operation:

* 2.5μA IQ Regulating 12VIN to 3.3VOUT

* Fixed Output Voltages: 3.3V, 5V

* Output Ripple < 10mVP-P (LT8610A Only)