Design possible with just a few capacitors and one resistor

Analog Devices announces the Power by Linear LTM4661, a low-power step-up µModule regulator in a 6.25mm x 6.25mm x 2.42mm BGA package.

It can be designed using only a few capacitors and a single resistor, and its solution area is limited to 1cm² for single-sided mounting PCBs and 0.5cm² for double-sided mounting PCBs. The LTM4661 integrates a switching DC/DC controller, MOSFETs, inductors, and other supporting components.

It also operates from an input voltage of 1.8 V to 5.5 V and continues operation down to 0.7 V after startup. The output voltage range is adjustable from 2.5 V to 15 V with a single resistor. The small, thin package and wide input/output voltage range make the LTM4661 ideal for applications such as optical modules, battery-powered devices, battery-backup devices, bias voltages for output amplifiers or laser diodes, and small DC motors.

The LTM4661 can continuously deliver 2A when converting 3.3VIN to 5VOUT and 0.7A when converting 3.3VIN to 12VOUT. Synchronous rectification enables conversion efficiency of up to 92% (3.3VIN to 5VOUT). The switching frequency is 1MHz and can be synchronized to an external clock in the range of 500kHz to 1.5MHz.

The LTM4661 features a 1MHz switching frequency and a dual-phase, single-output architecture, enabling fast transient response to input voltage and load changes while significantly reducing output ripple voltage. Furthermore, it offers three selectable operating modes: Burst Mode, Forced Persistence Mode, and External Sync Mode. Burst Mode quiescent current is a mere 25µA, extending battery life. For applications requiring ultra-low noise, Forced Persistence Mode or External Sync Mode can be used to minimize switching noise interference.

The LTM4661 features output disconnection during shutdown and inrush current limiting during startup. It also includes built-in protection against short-circuit, overvoltage, and overtemperature damage.