Summary of LT8616 – Dual 42V Synchronous Monolithic Step-Down Regulator with 6.5μA Quiescent Current
The LT8616 is a high-efficiency, dual synchronous monolithic step-down switching regulator featuring a wide input voltage range of 3.4V to 42V. It delivers 2.5A and 1.5A outputs with ultralow quiescent current of 6.5μA. Key features include fast minimum switch on-time, adjustable synchronization from 200kHz to 3MHz, and internal compensation for stability. The device supports output soft-start, tracking, and accurate enable thresholds in a thermally enhanced TSSOP package.
Parts used in the LT8616 Project:
- LT8616 Dual Synchronous Monolithic Step-Down Regulator
- TSSOP Package (Thermally Enhanced 28-Lead)
- External Clock (for SYNC pin synchronization)
- Inductors (small value enabled by internal compensation)
- Capacitors (for TR/SS pins and general filtering)
Features
- Wide Input Voltage Range: 3.4V to 42V
- 2.5A and 1.5A Buck Regulators with Separate Inputs
- Fast Minimum Switch On-Time: 35ns
- Ultralow Quiescent Current Burst Mode® Operation:
- 6.5μA IQ Regulating 12VIN to 5VOUT and 3.3VOUT
- Output Ripple < 15mV
- 180° Out of Phase Switching
- Adjustable and Synchronizable: 200kHz to 3MHz
- Accurate 1V Enable Pin Thresholds
- Internal Compensation
- Output Soft-Start and Tracking
- TSSOP Package: Output Stays at or Below Regulation Voltage During Adjacent Pin Short or When a Pin Is Left Floating
- Thermally Enhanced 28-Lead TSSOP Package
Description
The LT®8616 is a high efficiency, high speed, dual synchronous monolithic step-down switching regulator that consumes only 6.5μA of quiescent current with both channels enabled. Both channels contain all switches and necessary circuitry to minimize the need for external components. Low ripple Burst Mode operation enables high efficiency down to very low output currents while minimizing output ripple. A SYNC pin allows synchronization to an external clock. Internal compensation with peak current mode topology allows the use of small inductors and results in fast transient response and good loop stability. The enable pins have accurate 1V thresholds and can be used to program undervoltage lockout. Capacitors on the TR/SS pins programs the output voltage ramp rate during startup while the PG pins signal when each output is within 10% of the programmed output voltage. The LT8616 is available in a TSSOP package for high reliability.
For more detail: LT8616 – Dual 42V Synchronous Monolithic Step-Down Regulator with 6.5μA Quiescent Current
- What is the input voltage range?
The wide input voltage range is 3.4V to 42V. - How much quiescent current does it consume?
It consumes only 6.5μA of quiescent current with both channels enabled. - Can the switching frequency be adjusted?
Yes, the frequency is adjustable and synchronizable from 200kHz to 3MHz. - Does the device support output tracking?
Yes, it includes output soft-start and tracking capabilities. - What is the accuracy of the enable pin threshold?
The enable pins feature accurate 1V thresholds. - How is loop stability achieved without external components?
Internal compensation with peak current mode topology ensures good loop stability. - What package type is used for high reliability?
It is available in a thermally enhanced 28-Lead TSSOP package. - Does the output stay regulated during a short circuit?
Yes, the output stays at or below regulation voltage during adjacent pin shorts or floating pins.
