General Description

The MAX15034 two-phase, configurable single- or dual-

output buck controller has an input voltage range of

4.75V to 5.5V or 5V to 28V. A mode select input allows

for a dual-output supply or connecting two phases

together for a single-output, high-current supply. Each

output channel of the MAX15034 drives n-channel

MOSFETs and is capable of providing more than 25A of

load current. The MAX15034 uses average current-

mode control with a switching frequency up to 1MHz

per phase where each phase is 180° out of phase with

respect to the other. Out-of-phase operation results in

significantly reduced input capacitor ripple current and

output voltage ripple in dual-phase, single-output volt-

age applications. Each controller has its own high-per-

formance current and voltage-error amplifier that can

be compensated for optimum output filter L-C values

and transient response.

The MAX15034 offers two enable inputs with accurate

turn-on thresholds to allow for output voltage sequencing

of the two outputs. The device’s switching frequency can

be programmed from 100kHz to 1MHz with an external

resistor. The MAX15034 can be synchronized to an

external clock. Each output voltage is adjustable from

0.61V to 5.5V. Additional features include thermal shut-

down and hiccup-mode, short-circuit protection. Use the

MAX15034 with adaptive voltage positioning for applica-

tions that require a fast transient response or accurate

output voltage regulation.

The MAX15034 is available in a thermally enhanced 28-

pin TSSOP package capable of dissipating 2.1W. The

device is rated for operation over the -40°C to +125°C

automotive temperature range.

Applications

High-End Computers/Workstations/Servers

Graphics Cards

Networking Systems

Point-of-Load High-Current/High-Density

Telecom DC-DC Regulators

RAID Systems

Features

o 4.75V to 5.5V or 5V to 28V Input

o Dual-Output Synchronous Buck Controller

o Configurable for Two Separate Outputs (25A) or

One Single Output (50A)

o Average Current-Mode Control with Accurate

Adjustable Current Limit

o 180° Interleaved Operation Reduces Size of Input

Filter Capacitors

o Limits Reverse Current Sinking When Operated in

Parallel Mode

o Each Output is Adjustable from 0.61V to 5.5V

o Independently Programmable Adaptive Voltage

Positioning

o Monotonic Startup into Prebiased Outputs

o Independent Shutdown for Each Output

o 100kHz to 1MHz per Phase Programmable

Switching Frequency

o Oscillator Frequency Synchronization from

200kHz to 2MHz

o Digital Soft-Start on Outputs

o Hiccup-Mode Overcurrent Protection

o Overtemperature Shutdown

o Thermally Enhanced 28-Pin TSSOP Package

Capable of Dissipating 2.1W

Configurable, Single-/Dual-Output, Synchronous

Buck Controller for High-Current Applications

________________________________________________________________

Maxim Integrated Products

1

Ordering Information

19-4218; Rev 1; 10/11

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.

PART

TEMP RANGE

PIN-PACKAGE

MAX15034AAUI+

-40°C to +125°C

28 TSSOP

MAX15034BAUI+

-40°C to +125°C

28 TSSOP-EP*

MAX15034BAUI/V+

-40°C to +125°C

28 TSSOP-EP*

+

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

*

EP = Exposed pad.

/V Denotes an automotive qualified part.

EVALUATION

KIT

AVAILABLE