MAX15034 Datasheet, PDF (1/25 Pages) Maxim Integrated Products – Configurable, Single-/Dual-Output, Synchronous Buck Controller for High-Current Applications

19-4218; Rev 0; 7/08
EVAALVUAAILTAIOBNLEKIT
Configurable, Single-/Dual-Output, Synchronous
Buck Controller for High-Current Applications
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.
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
Applications
High-End Computers/Workstations/Servers
Graphics Cards
Networking Systems
Point-of-Load High-Current/High-Density
Telecom DC-DC Regulators
RAID Systems
Ordering Information
PART
TEMP RANGE PIN-PACKAGE
MAX15034AAUI+ -40°C to +125°C 28 TSSOP
MAX15034BAUI+ -40°C to +125°C 28 TSSOP-EP*
+Denotes a lead-free/RoHS-compliant package.
*EP = Exposed pad.
________________________________________________________________ Maxim Integrated Products 1
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.