μModule Regulator with Programmable Compensation

FPGA boards, as well as prototype, testing, and measurement applications demand versatile and high density power solutions. The LTM4678 is a dual 25 A or single 50 A µModule regulator with digital power system management (PSM) in a small 16 mm × 16 mm footprint. It features:

• Dual digitally adjustable analog loops with a digital interface for control and monitoring
• Wide input voltage range: 4.5 V to 16 V
• Wide output voltage range: 0.5 V to 3.3 V
• ±0.5% maximum dc output error over temperature
• ±5% current readback accuracy
• Sub-mΩ DCR current sensing
• Integrated input current sense amplifier
• 400 kHz PMBus-compliant I²C serial interface
• Telemetry polling rates up to 125 Hz
• An integrated 16-bit Σ-Δ ADC
• Constant frequency current mode control
• Parallel operation with balanced current sharing
• 16 mm × 16 mm × 5.86 mm CoP-BGA

I²C-Based PMBUS Interface and Programmable Loop Compensation

The LTM4678 is a member of ADI’s power system management (PSM) µModule family, so it can be configured and monitored through a PMBus/SMBus/I²C digital interface. The PC-based LTpowerPlay^® tool enables visual monitoring and control of power supply voltage, current, power use, sequencing, margining, and fault log data. The LTM4678 is the first µModule regulator with programmable loop compensation: g_m and R_TH, which greatly reduces design time, since dynamic performance tuning is done without the hassle of iterative PCB board builds or modifications.

CoP-BGA Package for Enhanced Thermal Performance, Small Size and High Power Density

A thermally enhanced component on package (CoP) BGA package enables the high power LTM4678 to fit a small 16 mm × 16 mm PCB footprint. Inductors are stacked and used as a heat sink to enable efficient cooling.

Easily Scale to Higher Current with Current Mode Control

The LTM4678 uses peak current-mode control. Current is monitored and controlled cycle by cycle. This enables equal current sharing among phases.

Other Unique Features

• Dual remote output sensing compensates for the voltage drop on traces in high current application
• ±0.5% maximum dc output error over temperature provides additional regulation margin
• Direct input current sense measures the precise input current and power
• Dedicated PGOOD pins provide signal for downstream systems when output voltage is in regulation range
• EXTV_CC pin maximizes efficiency at high V_IN conditions

For more information, visit www.analog.com.