Analog Devices Inc. LT8652S Synchronous Step-Down Silent Switcher®

Analog Devices LT8652S Synchronous Step-Down Silent Switcher® is a dual step-down regulator that delivers up to 8.5A of continuous current from both channels and supports loads up to 12A from each channel. The LT8652S uses second-generation Silent Switcher technology including integrated bypass capacitors to deliver a high frequency, high efficiency, small solution with excellent EMI performance. The Analog Devices LT8652S is ideal for noise-sensitive applications such as PLLs and high bandwidth data and communications systems.

The fast, clean, low overshoot switching edges enable high-efficiency operation even at high switching frequencies, enabling a wide control loop bandwidth for a fast transient response. Output current monitoring and limiting allows inductors to be selected for the maximum output current in a given application. Differential output voltage sensing provides accurate voltage regulation at the point of load for high current applications. The two channels can be combined to deliver 17A, and two LT8652S ICs can be combined for a 4-phase, 34A supply.

Features

Silent Switcher®2 architecture
- Ultralow EMI on any PCB
- Eliminates PCB layout sensitivity
- Internal bypass capacitors reduce radiated EMI
- Spread spectrum frequency modulation
8.5A DC from each channel simultaneously
Up to 12A on either channel
Ultralow quiescent current Burst Mode® operation:
- 16µA I_Q regulating 12V_IN to 3.3V_OUT (both channels)
- Output ripple <10mV_P-P

±1.2% 600mV feedback voltage with remote sense
Output current monitor pins with current limiting
Forced continuous mode
CLKOUT for up to 4-phase operation
93.6% efficiency at 6A, 3.3V_OUT from 12V_IN at 1MHz
85.6% efficiency at 6A, 1.0V_OUT from 12V_IN at 1MHz
20ns fast minimum switch-on time
300kHz to 3MHz adjustable and synchronizable frequency
Small 4mm x 7mm 36-pin LQFN package
AEC-Q100 qualified for automotive applications

Applications

Server power applications

General purpose step-down

Technical Articles

DC-to-DC Converter Solution for Signal and Data Processing Circuits
The processing power of FPGAs, SoCs, and microprocessors continually increases, resulting in corresponding increases in raw power requirements. As the number of required power rails and their carrying capacity increases, it is imperative to think small and fast with regard to design and performance of the power system.