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High-Efficiency, 3A, Current-Mode

Synchronous, Step-Down Switching Regulator

General Description

The MAX15058 high-efficiency, current-mode, synchro-

nous step-down switching regulator with integrated

power switches delivers up to 3A of output current.

The device operates from 2.7V to 5.5V and provides an

output voltage from 0.6V up to 94% of the input voltage,

making the device ideal for distributed power systems,

portable devices, and preregulation applications.

The MAX15058 utilizes a current-mode control archi-

tecture with a high-gain transconductance error ampli-

fier. The current-mode control architecture facilitates

easy compensation design and ensures cycle-by-cycle

current limit with fast response to line and load transients.

The MAX15058 offers selectable skip-mode functional-

ity to reduce current consumption and achieve a higher

grated switches ensure high efficiency at heavy loads

while minimizing critical inductances, making the layout

design a much simpler task with respect to discrete

solutions. Utilizing a simple layout and footprint assures

first-pass success in new designs.

The MAX15058 features a 1MHz, factory-trimmed, fixed-

frequency PWM mode operation. The high switching fre-

quency, along with the PWM current-mode architecture,

allows for a compact, all-ceramic capacitor design.

The MAX15058 offers a capacitor-programmable soft-

start reducing inrush current, startup into PREBIAS

operations, and a PGOOD open-drain output that can be

used as an interrupt and for power sequencing.

The MAX15058 is available in a 9-bump (3 x 3 array),

1.5mm x 1.5mm WLP package and is specified over the

-40NC to +85NC temperature range.

Applications

Distributed Power Systems

Preregulators for Linear Regulators

Portable Devices

Notebook Power

Server Power

IP Phones

Features

S

(typ) Low-Side MOSFETs at 5V

S

Continuous 3A Output Current Over Temperature

S

95% Efficiency with 3.3V Output at 3A

S

1% Output Voltage Accuracy Over Load, Line, and

Temperature

S

Operates from 2.7V to 5.5V Supply

S

Cycle-by-Cycle Overcurrent Protection

S

S

Programmable Soft-Start

S

Factory-Trimmed, 1MHz Switching Frequency

S

Stable with Low-ESR Ceramic Output Capacitors

S

Safe-Startup Into Prebiased Output

S

External Reference Input

S

Skip-Mode Functionality

S

Enable Input/Power-Good Output

S

Fully Protected Against Overcurrent and

Overtemperature

S

Input Undervoltage Lockout

19-5478; Rev 2; 7/11

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

Ordering Information

Typical Operating Circuit

EVALUATION

KIT

AVAILABLE

PART

TEMP RANGE

PIN-PACKAGE

MAX15058EWL+

-40°C to +85°C

9 WLP

IN

LX

OUTPUT

1.8V/3A

INPUT

2.8V TO 5.5V

GND

FB

COMP

PGOOD

EN

SKIP

SS/REFIN

ON

OFF

ENABLE

MAX15058