Flexible 4x output converter

Fe1728 is a quad-output, 8-phase integrated DC-DC step-down power converter delivering up to 28A total output current in a compact 14.7 mm² package.

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Fe1728 - Product Overview

The Fe1728 integrated voltage regulator is a self-contained power system-on-chip designed to provide compact and efficient voltage regulation close to high-performance digital loads.

The device includes four independently controlled output domains, with each output capable of supplying up to 7A. The outputs can operate independently for multi-rail applications or can be combined to support higher-current power requirements.

At the core of the Fe1728 is an 8-phase interleaved buck converter with a fully integrated powertrain. Power FETs, capacitors, control circuitry, and Ferric’s proprietary ferromagnetic integrated inductors are incorporated into a single compact package.

This high level of integration enables high-frequency power conversion while reducing external component requirements, PCB area, interconnect complexity, and overall power-delivery footprint.

Key Features

Four independently controlled power outputs

Up to 7A output current per domain

Up to 28A total steady-state output current

8-phase interleaved buck converter with integrated powertrain

Fully integrated power switches and inductors

1.6V to 2.0V input voltage range

0.25V to 1.5V output voltage range

31MHz typical switching frequency

Wide loop bandwidth of 10MHz

Compact 15.1 mm² package

Differential point-of-load (PoL) sensing

Automatic phase shedding

Gang operation with up to 32 devices in parallel

Dynamic Voltage Scaling (DVS)

Input/output voltage, current, and temperature telemetry

Comprehensive fault protection: UVLO, OVP, UVP, OCP, VRHOT, OTP

1MHz PMBus 1.3-compliant serial interface

50MHz AVSBus 1.4-compliant serial interface

1.9 A/mm² current density (TDC)

Ultra-thin 0.725mm package thickness

Parameter	Symbol	Conditions	Min	Typ	Max	Unit
VIN Voltage Range	V_IN	AVDD18 ≥ V_IN	1.6	1.8	2.0	V
Output Voltage Range	V_OUT	V_IN ≥ 1.8V	0.25		1.5	V
Output Voltage Resolution	V_OUT,RES			1.7		mV
Total Steady State Output Current	I_OUT,TOT				28	A
Number of Output Domains	N_DOMAINS		1		4	Domains
Total Powertrain Phases	N_PHASES				8	Phases
Width	W		2.950	2.990	3.030	mm
Length	L		5.010	5.050	5.090	mm
Area	A			15.1		mm²
Thickness	T		0.705	0.725	0.745	mm
Current Density (TDC)	j_max,TDC				1.9	A/mm²
DC Line Regulation	(ΔV_OUT/V_OUT)_Line	V_IN = [1.6, 2.0]V		± 0.5		%
DC Load Regulation	(ΔV_OUT/V_OUT)_Load	I_OUT = [0, 28]A		± 0.5		%
Switching Frequency	f_SW		25	31	100	MHz
Thermal Resistance Junction to Top	Θ_JC,TOP			0.1		°C/W
Thermal Resistance Junction to Bottom	Θ_JC,BOT			3.9		°C/W

FAQ - Fe1728

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