High Efficiency 65V/100mA Synchronous Bucks

The LT8618 family are compact, high speed synchronous monolithic step-down switching regulators that deliver up to 100mA to the output with high efficiency at a constant frequency, even up to 2.2MHz. They accept a wide input voltage range up to 65V (transients only, 60V for continuous operation), and consume only 2.5μA of quiescent current when operating in Burst Mode. Top and bottom power switches are included with all necessary circuitry to minimize the need for external components.

The LT8618C includes BST and INTVCC ceramic capacitors for a more compact solution while having SYNC/MODE and HYST pins. The SYNC/MODE pin selects the regulator’s operation between forced continuous mode, for predictive interference in sampling systems, Burst Mode, for increased efficiency at light loads or spread spectrum for Low EMI. It also allows synchronization to an external clock to further increase signal to noise ratio in high-resolution acquisition systems.

A PG flag signals when VOUT is within ±7.5% of the programmed output voltage and when in fault conditions. Thermal shutdown provides additional protection.

PACKAGE

SYNC/HYST

150°C GRADE

INTERNAL CAPS

FB RESISTORS

LT8618

DFN

No

Yes

No

External

LT8618-3.3

DFN

No

Yes

No

Internal

LT8618C

LQFN

Yes

No

Yes

External

Applications

* Industrial Sensors

* Industrial Internet of Things

* 4mA to 20mA Current Loops

* Flow Meters

* Automotive Housekeeping Supplies

* High Efficiency Synchronous Operation

* > 90% Efficiency at 30mA, 12VIN to 3.3VOUT

* Pin Selectable Forced Continuous or Burst Mode® Operation (LT8618C Only)

* Ultralow Quiescent Current Burst Mode Operation

* < 2.5μA IQ Regulating 48VIN to 3.3VOUT

* Output Ripple < 10mVP-P

* 3.4V to 60V Input Operation Range (65V Max)

* Fast Minimum Switch-On Time: 35ns

* Adjustable (All) And Synchronizable (LT8618C Only) Switching Frequency: 200kHz to 2.2MHz