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MAX8649, MAX8649A

1.8A Step-Down Regulator with Remote Sense in 2mm x 2mm WLP

Ideal for High Performance Applications Processors with Better than 2% Voltage Accuracy Over Line, Load, and Temperature

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Overview

Description

The MAX8649 high-efficiency DC-to-DC step-down switching regulator delivers up to 1.8A of output current. The device operates from a 2.5V to 5.5V input voltage range, making it future proof for next-generation battery technologies. The output voltage is I²C programmable from 0.75V to 1.38V. Remote sense ensures precise DC regulation at the load. Total output error is less than 2% over load, line, and temperature.

The MAX8649 operates at a 3.25MHz fixed frequency. The high operating frequency minimizes the size of external components. The MAX8649 provides several features to minimize EMI of the DC-DC step-down converter. The switching frequency of the converter can be synchronized to the master clock of the application. When synchronizing to an external clock, the MAX8649 measures the frequency of the external clock to ensure that the clock is stable before changing the switching frequency to the external clock frequency.

An on-board DAC allows adjustment of the output voltage in 10mV steps. The output voltage can be programmed directly through the I²C interface, or by preloading a set of on-board registers and using the two VID logic signals to select the appropriate register. Other features include internal soft-start control circuitry to reduce inrush current, output overvoltage, overcurrent, and overtemperature protection.

MAX8649: Typical Operating Circuit

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Key Features

1.8A Guaranteed Output Current
I²C Programmable V_OUT (750mV to 1.38V in 10mV steps)
Operates from 2.5V to 5.5V Input Supply
On-Chip FET and Synchronous Rectifier
Fixed 3.25MHz PWM Switching Frequency
Synchronizes to 13MHz, 19.2MHz, or 26MHz System Clock when Available
Small 1.0µH Inductor
Initial Accuracy 0.5% at 1.25V Output
2% Output Accuracy Over Load, Line, and Temperature
Power-Save Mode Increases Light Load Efficiency
Overvoltage and Overcurrent Protection
Thermal Shutdown Protection
400kHz I²C Interface
< 1µA Shutdown Current
16-Bump, 2.2mm x 2.2mm WLP Package

Applications/Uses

Cell Phones and Smartphones
PDAs and MP3 Players

Parametric Specs

Part Number

V_IN
(V)

V_OUT1
(V)

Preset V_OUT
(V)

Output Adjust. Method

I_OUT1
(A)

Switch Type

Synchronous Switching

DC-DC Outputs

Oper. Freq.
(kHz)

Package/Pins

Budgetary
Price

min

max

min

max

See Notes

MAX8649

2.5

5.5

0.75

1.38

1.05

1.23

1.27

Digital/VID

1.8

Internal

Yes

3250

WLP/16

$1.81 @1k

See All Step-Down Switching Regulators (404)

Pricing Notes:

This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

Design Resources

MAX8649EVKIT: Evaluation Kit for the MAX8649

Technical Documents

Tutorial 5133 Power-Supply Solutions for Altera FPGAs
Tutorial 5132 Power-Supply Solutions for Xilinx FPGAs

Quality and Environmental Data

Request Reliability Report for: MAX8649 MAX8649A
Lead-Free Package Tin (Sn) Whisker Reports

Quality And Environmental

Device	Fab Process	Technology	Sample size	Rejects	FIT at 25°C	FIT at 55°C

Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

Quality Management System >
Environmental Management System >

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