ADP3208 ON Semiconductor, ADP3208 Datasheet

ADP3208

Manufacturer Part Number

ADP3208

Description

7-bit, Programmable, Dual-phase, Mobile, Cpu, Synchronous Buck Controller

Manufacturer

ON Semiconductor

Datasheet

1.ADP3208.pdf (38 pages)

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Current page: 1 of 38
Download datasheet (763Kb)

FEATURES

Single-chip solution

Selectable 1- or 2-phase operation with up to 1 MHz per

Guaranteed ±8 mV worst-case differentially sensed core

Automatic power-saving mode maximizes efficiency with

Soft transient control reduces inrush current and audio noise

Active current balancing between output phases

Independent current limit and load line setting inputs for

Built-in power-good blanking supports

7-bit, digitally programmable DAC with 0.3 V to 1.5 V output

Short-circuit protection with programmable latch-off delay

Clock enable output delays the CPU clock until the core

Output power or current monitor options

48-lead LFCSP

APPLICATIONS

Notebook power supplies for next-generation Intel processors

December 2007 – Rev. 1

phase switching frequency

voltage error over temperature

light load during deeper sleep operation

additional design flexibility

voltage identification (VID) on-the-fly transients

voltage is stable

Fully compatible with the Intel® IMVP-6+™ specifications

Integrated MOSFET drivers

VID6, VID5,

VID4, VID3,

VID2, VID1,

VARFREQ

PGDELAY

DPRSTP

DPRSLP

PWRGD

CLKEN

VID0

GND

VCC

PSI

7-Bit, Programmable, Dual-Phase, Mobile,

PSI

ADP3208

UVLO

FUNCTIONAL BLOCK DIAGRAM

RAMP

DAC

VID

VREF

FBRTN

GENER-

RAMP

ATOR

KEEPING

HOUSE-

VDAC

VRPM

REFTH

REF

SELECT

REFER-

VREF

ENCE

CMPS

PWM

CLREF

CLTHSEL

RPM

SWITCH

AMPS

OVTH

UVTH

PMON PMONFS

CPU, Synchronous Buck Controller

OSCILLATOR

Figure 1.

BIAS

PMON

PWM

CONTROL

LATCH

PHASE

PWM

CLIM

CMP

ERR AMP

CSAVG

GENERAL DESCRIPTION

The ADP3208 is a highly efficient, multiphase, synchronous

buck switching regulator controller. With its integrated drivers,

the ADP3208 is optimized for converting the notebook battery

voltage into the core supply voltage required by high performance

Intel processors. An internal 7-bit DAC is used to read a VID code

directly from the processor and to set the CPU core voltage to a

value within the range of 0.3 V to 1.5 V. The phase relationship

of the output signals ensures interleaved 2-phase operation.

The ADP3208 uses a multimode architecture run at a program-

mable switching frequency and optimized for efficiency depending

on the output current requirement. The ADP3208 switches

between single- and dual-phase operation to maximize efficiency

with all load conditions. The chip includes a programmable load

line slope function to adjust the output voltage as a function of the

load current so that the core voltage is always optimally positioned

for a load transient. The ADP3208 also provides accurate and

reliable short-circuit protection, adjustable current limiting, and

a delayed power-good output. The IC supports on-the-fly output

voltage changes requested by the CPU.

The ADP3208 is specified over the extended commercial tempera-

ture range of 0°C to 100°C and is available in a 48-lead LFCSP.

CSAMP

–

OD1B

OD1A

OD2

DRV2

DRV1

–

VCC

BST2

DRVH2

SW2

PVCC2

DRVL2

PGND2

BST1

DRVH1

SW1

PVCC1

DRVL1

PGND1

COMP

LLINE

CSCOMP

CSSUM

CSREF

CLIM

VRTT

TTSNS

FBRTN

Publication Order Number:

ADP3208

ADP3208/D

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