ADP3421JRU Analog Devices, ADP3421JRU Datasheet

ADP3421JRU

Manufacturer Part Number

ADP3421JRU

Description

Geyserville-Enabled DC-DC Converter Controller for Mobile CPUs

Manufacturer

Analog Devices

Datasheet

1.ADP3421JRU.pdf (12 pages)

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Bonase Electronics (HK) Co., Limited

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GENERAL DESCRIPTION

The ADP3421 is a hysteretic dc-dc buck converter controller

with two auxiliary linear regulator controllers. The ADP3421

provides a total power conversion control solution for a micro-

processor by delivering the core, I/O, and clock voltages. The

optimized low-voltage design is powered from the 3.3 V system

supply and draws only 10 µA maximum in shutdown. The main

output voltage is set by a 5-bit VID code. To accommodate the

transition time required by the newest processors for on-the-

fly VID changes, the ADP3421 features high-speed operation

to allow a minimized inductor size that results in the fastest change

of current to the output. To further allow for the minimum

number of output capacitors to be used, the ADP3421 features

active voltage positioning that can be optimally compensated

to ensure a superior load transient response. The main output

signal interfaces with the ADP3410 dual MOSFET driver,

which is optimized for high speed and high efﬁciency for driving

both the upper and lower (synchronous) MOSFETs of the

buck converter.

Converter Controller for Mobile CPUs

DACOUT

CLKDRV

CLKFB

IODRV

UVLO

IOFB

VID4

VID3

VID2

VID1

VID0

GND

LTO

VCC

LTB

LTI

Geyserville-Enabled DC-DC

TRANSLATOR

CONTROLLER

MONITOR AND

CONTROLLER

CLOCK LDO

VID DAC

FUNCTIONAL BLOCK DIAGRAM

REFERENCE

UVLO BIAS

LEVEL

I/O LDO

VIN/VCC

BIAS EN

REFERENCE

BIAS AND

COMPARATOR

CORE CONTROLLER

CURRENT

COMPARATOR

LIMIT

CORE

ADP3421

POWER GOOD

GENERATOR

SOFT START

TIMER

ADP3421

AND

CLSET

CS+

CS–

VHYS

REG

RAMP

OUT

SSC

SSL

CORE

PWRGD

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