Rainbow-electronics MAX15051 User Manual download pdf

General Description

The MAX15050/MAX15051 high-efficiency switching reg-

ulators deliver up to 4A load current at output voltages

from 0.6V to (0.9 x V

). The devices operate from 2.9V

to 5.5V, making them ideal for on-board point-of-load

and postregulation applications. Total output-voltage

accuracy is within ±1% over load, line, and temperature.

The MAX15050/MAX15051 feature 1MHz fixed-frequen-

cy PWM operation. The MAX15050 features pulse-skip

mode to improve light-load efficiency. The MAX15050

soft-starts in a monotonic mode and then operates in

the forced PWM mode or pulse-skip mode depending

on the output load current condition. The MAX15051

soft-starts in the monotonic mode and operates in the

forced PWM mode. The high operating frequency

allows for small-size external components.

The low-resistance on-chip nMOS switches ensure high

efficiency at heavy loads while minimizing critical parasitic

inductances, 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.

The MAX15050/MAX15051 incorporate a high-bandwidth

(> 26MHz) voltage-error amplifier. The voltage-mode control

architecture and the voltage-error amplifier permit a type III

compensation scheme to achieve maximum loop band-

width, up to 200kHz. High loop bandwidth provides fast

transient response, resulting in less required output capaci-

tance and allowing for all-ceramic capacitor designs.

The MAX15050/MAX15051 feature an output overload

hiccup protection and peak current limit on both high-

side and low-side MOSFETs. These features provide for

ultra-safe operation in the cases of short-circuit condi-

tions, severe overloads, or in converters with bulk elec-

trolytic capacitors.

The MAX15050/MAX15051 feature an adjustable output volt-

age. The output voltage is adjustable by using two external

resistors at the feedback or by applying an external reference

voltage to the REFIN/SS input. The MAX15050/MAX15051

offer programmable soft-start time using one capacitor to

reduce input inrush current. A built-in thermal shutdown pro-

tection assures safe operation under all conditions. The

MAX15050/MAX15051 are available in a 2mm x 2mm,

16-bump (4 x 4 array), 0.5mm pitch WLP package.

Applications

Features

o Internal 18mΩ R

DS(ON)

MOSFETs

o Pulse-Skip Mode for High-Efficiency Light Load

(MAX15050)

o Continuous 4A Output Current

o ±1% Output-Voltage Accuracy Over Load, Line,

and Temperature

o Operates from 2.9V to 5.5V Supply

o Adjustable Output from 0.6V to (0.9 x V

)

o Adjustable Soft-Start Reduces Inrush Supply Current

o Factory-Trimmed 1MHz Switching Frequency

o Compatible with Ceramic, Polymer, and

Electrolytic Output Capacitors

o Safe Startup Into Prebias Output

o Enable Input/Power-Good Output

o Fully Protected Against Overcurrent and

Overtemperature

o Overload Hiccup Protection

o Sink/Source Current for DDR Applications

o 2mm x 2mm, 16-Bump (4 x 4 Array), 0.5mm Pitch

WLP Package

MAX15050/MAX15051

High-Efficiency, 4A, 1MHz, Step-Down Regulators

with Integrated Switches in 2mm x 2mm Package

________________________________________________________________

Maxim Integrated Products

Ordering Information

19-4915; Rev 2; 3/10

EVALUATION KIT

AVAILABLE

PART TEMP RANGE

PIN-

PACKAGE

SKIP

MODE

M A X1 5 0 5 0 E WE + - 40°C to + 85°C 16 WLP Yes

M A X1 5 0 5 1 E WE + - 40°C to + 85°C 16 WLP No

Denotes a lead(Pb)-free/RoHS-compliant package.

Pin Configuration appears at end of data sheet.

OUTPUT

INPUT

2.9V TO 5.5V

BST

GND

COMP

PWRGD

REFIN/SS

GND

MAX15050

MAX15051

Typical Operating Circuit

Server Power Supplies

Point-of-Load

ASIC/CPU/DSP Core

and I/O Voltages

DDR Power Supplies

Base-Station Power

Supplies

Telecom and

Networking Power

Supplies

RAID Control Power

Supplies

Portable Applications

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.

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MAX15050/MAX15051 1

Summary of Contents

Page 1 - MAX15050/MAX15051

General DescriptionThe MAX15050/MAX15051 high-efficiency switching reg-ulators deliver up to 4A load current at output voltagesfrom 0.6V to (0.9 x VIN

Page 2

MAX15050/MAX15051High-Efficiency, 4A, 1MHz, Step-Down Regulatorswith Integrated Switches in 2mm x 2mm Package10 ______________________________________

Page 3

MAX15050/MAX15051High-Efficiency, 4A, 1MHz, Step-Down Regulatorswith Integrated Switches in 2mm x 2mm Package_________________________________________

Page 4

MAX15050/MAX15051High-Efficiency, 4A, 1MHz, Step-Down Regulatorswith Integrated Switches in 2mm x 2mm PackageThe peak-to-peak inductor current (IP-P)

Page 5

MAX15050/MAX15051The above equations are based on the assumptions thatC1 >> C2, and R3 >> R2, which are true in most appli-cations. Placem

Page 6

MAX15050/MAX15051High-Efficiency, 4A, 1MHz, Step-Down Regulatorswith Integrated Switches in 2mm x 2mm Package14 ______________________________________

Page 7

MAX15050/MAX15051High-Efficiency, 4A, 1MHz, Step-Down Regulatorswith Integrated Switches in 2mm x 2mm PackageMaxim cannot assume responsibility for us

Page 8

MAX15050/MAX15051High-Efficiency, 4A, 1MHz, Step-Down Regulatorswith Integrated Switches in 2mm x 2mm Package2 _______________________________________

Page 9

MAX15050/MAX15051High-Efficiency, 4A, 1MHz, Step-Down Regulatorswith Integrated Switches in 2mm x 2mm Package_________________________________________

Page 10

MAX15050/MAX15051High-Efficiency, 4A, 1MHz, Step-Down Regulatorswith Integrated Switches in 2mm x 2mm Package4 _______________________________________

Page 11

MAX15050/MAX15051High-Efficiency, 4A, 1MHz, Step-Down Regulatorswith Integrated Switches in 2mm x 2mm Package_________________________________________

Page 12

MAX15050/MAX15051High-Efficiency, 4A, 1MHz, Step-Down Regulatorswith Integrated Switches in 2mm x 2mm Package6 _______________________________________

Page 13

MAX15050/MAX15051High-Efficiency, 4A, 1MHz, Step-Down Regulatorswith Integrated Switches in 2mm x 2mm Package_________________________________________

Page 14

MAX15050/MAX15051High-Efficiency, 4A, 1MHz, Step-Down Regulatorswith Integrated Switches in 2mm x 2mm Package8 _______________________________________

Page 15

MAX15050/MAX15051C90.1µFOPTIONALC122µFOUTPUT1.8V/4AINPUT2.9V TO 5.5VC30.1µFBSTLXINVDDFBCOMPC1256pFC101000pFC111500pFR45.62kΩR520kΩPWRGDL10.82µHC80.033

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Rainbow-electronics MAX15051 User Manual

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