MAX8646

更新时间： 2024-11-21 04:41:35

品牌	Logo	应用领域
美信 - MAXIM		稳压器开关
页数	文件大小	规格书
16页	363K
描述
6A, 2MHz Step-Down Regulator with Integrated Switches

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MAX8646 数据手册

19-3971; Rev 2; 10/07

6A, 2MHz Step-Down Regulator

with Integrated Switches

General Description

Features

The MAX8646 high-efficiency switching regulator deliv-

ers up to 6A load current at output voltages from 0.6V

♦ Internal 23mΩ R

MOSFETs

DS(ON)

♦ Continuous 6A Output Current

to 0.9 x V . The IC operates from 2.35V to 3.6V, mak-

♦ ±1% Output Accuracy over Load, Line,

and Temperature

ing it ideal for on-board point-of-load and postregula-

tion applications. Total output error is less than ±±1

over load, line, and temperature ranges.

♦ Operates from 2.35V to 3.6V Supply

♦ Adjustable Output from 0.6V to (0.9 x V

IN)

The MAX8646 features fixed-frequency PWM mode

operation with a switching frequency range of 500kHz

to 2MHz set by an external resistor. High-frequency

operation allows for an all-ceramic capacitor design.

The high operating frequency also allows for small-size

external components.

♦ Soft-Start Reduces Inrush Supply Current

♦ 500kHz to 2MHz Adjustable Switching Frequency

♦ Compatible with Ceramic, Polymer, and

Electrolytic Output Capacitors

♦ VID-Selectable Output Voltages

0.6V, 0.7V, 0.8V, 1.0V, 1.2V, 1.5V, 1.8V, 2.0V,

and 2.5V

The low-resistance on-chip nMOS switches ensure high

efficiency at heavy loads while minimizing critical induc-

tances, making the layout a much simpler task with

respect to discrete solutions. Following a simple layout

and footprint ensures first-pass success in new designs.

♦ Fully Protected Against Overcurrent and

Overtemperature

♦ Safe-Start into Prebiased Output

♦ Sink/Source Current in DDR Applications

♦ Lead-Free, 24-Pin, 4mm x 4mm Thin QFN Package

The MAX8646 comes with a high bandwidth (> ±4MHz)

voltage-error amplifier. The voltage-mode control archi-

tecture and the voltage-error amplifier permit a type III

compensation scheme to be utilized to achieve maxi-

mum loop bandwidth, up to 201 of the switching fre-

quency. High loop bandwidth provides fast transient

response, resulting in less required output capacitance

and allowing for all-ceramic-capacitor designs.

Ordering Information

TEMP

PKG

CODE

PART

PIN-PACKAGE

RANGE

24 Thin QFN-EP*

4mm x 4mm

The MAX8646 provides two tri-state logic inputs to

select one of nine preset output voltages. The preset

output voltages allow customers to achieve ±±1 out-

put-voltage accuracy without using expensive 0.±1

resistors. In addition, the output voltage can be set to

any customer value by either using two external resis-

tors at the feedback with 0.6V internal reference or

applying an external reference voltage to the REFIN

input. The MAX8646 offers programmable soft-start

time using one capacitor to reduce input inrush current.

The MAX8646 is available in a lead-free, 24-pin, 4mm x

4mm, thin QFN package.

MAX8646ETG+ -40°C to +85°C

T2444-4

+Denotes a lead-free package.

*EP = Exposed pad.

Typical Operating Circuit

INPUT

2.4V, 3.6V

BST

OUTPUT

1.8V, 6A

MAX8646

OUT

Applications

PGND

POLs

CTL1

ASIC/CPU/DSP Core and I/O Voltages

DDR Power Supplies

CTL2

FREQ

Base-Station Power Supplies

Telecom and Networking Power Supplies

RAID Control Power Supplies

REFIN

COMP

PREBIAS

PWRGD

GND

Pin Configuration appears at end of data sheet.

________________________________________________________________ Maxim Integrated Products

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,

or visit Maxim’s website at www.maxim-ic.com.

12 3 4 5 6 7...16

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与MAX8646相关器件

型号	品牌	获取价格	描述	数据表
MAX8646ETG+	MAXIM	获取价格	6A, 2MHz Step-Down Regulator with Integrated Switches
MAX8646ETG+T	MAXIM	获取价格	Switching Regulator, Voltage-mode, 11A, 2000kHz Switching Freq-Max, BICMOS, 4 X 4 MM, 0.80
MAX8647	MAXIM	获取价格	Ultra-Efficient Charge Pumps for Six White/RGB LEDs in 3mm x 3mm Thin QFN
MAX8647	ADI	获取价格	可驱动6只白光/RGB LED的超高效电荷泵，3mm x 3mm薄型QFN封装
MAX8647_0709	MAXIM	获取价格	Ultra-Efficient Charge Pumps for Six White/RGB LEDs in 3mm x 3mm Thin QFN
MAX8647ETE+	MAXIM	获取价格	Ultra-Efficient Charge Pumps for Six White/RGB LEDs in 3mm x 3mm Thin QFN
MAX8647ETE+T	MAXIM	获取价格	Switched Capacitor Regulator, 1000kHz Switching Freq-Max, BICMOS, 3 X 3 MM, 0.80 MM HEIGHT
MAX8648ETE+	MAXIM	获取价格	Ultra-Efficient Charge Pumps for Six White/RGB LEDs in 3mm x 3mm Thin QFN
MAX8648ETE+T	MAXIM	获取价格	Switched Capacitor Regulator, 1000kHz Switching Freq-Max, BICMOS, 3 X 3 MM, 0.80 MM HEIGHT
MAX8649	MAXIM	获取价格	1.8A Step-Down Regulator with Remote Sense in 2mm x 2mm WLP

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