Rainbow Electronics MAX5066 - Manual

General Description
The MAX5066 is a two-phase, configurable single- or
dual-output buck controller with an input voltage range of
4.75V to 5.5V or from 5V to 28V. Each phase of the
MAX5066 is designed for 180° operation. A mode pin
allows for a dual-output supply or connecting two phases
together for a single-output, high-current supply. Each
output channel of the MAX5066 drives n-channel
MOSFETs and is capable of providing more than 25A of
load current. The MAX5066 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 volt-
age ripple in dual-phase, single-output voltage applica-
tions. Each buck regulator output has its own high-
performance current and voltage-error amplifier that can
be compensated for optimum output filter L-C values and
transient response.
The device’s switching frequency can be programmed
from 100kHz to 1MHz with an external resistor. The
MAX5066 can be synchronized to an external clock. Each
output voltage is adjustable from 0.61V to 5.5V. Additional
features include thermal shutdown, “hiccup mode” short-
circuit protection. Use the MAX5066 with adaptive voltage
positioning for applications that require a fast transient
response, or accurate output voltage regulation.
The MAX5066 is available in a thermally enhanced 28-pin
TSSOP package capable of dissipating 1.9W. The device
is rated for operation over the -40°C to +85°C extended,
or -40°C to +125°C automotive temperature range.
Applications
High-End Desktop Computers
Graphics Cards
Networking Systems
Point-of-Load High-Current/High-Density
Telecom DC-DC Regulators
RAID Systems
Features
♦ 4.75V to 5.5V or 5V to 28V Input
♦ Dual-Output Synchronous Buck Controller
♦ Configurable for Two Separate Outputs or One
Single Output
♦ Each Output is Capable of Up to 25A Output
Current
♦ Average Current-Mode Control Provides Accurate
Current Limit
♦ 180° Interleaved Operation Reduces Size of Input
Filter Capacitors
♦ Limits Reverse Current Sinking When Operated in
Parallel Mode
♦ Each Output is Adjustable from 0.61V to 5.5V
♦ Independently Programmable Adaptive Voltage
Positioning
♦ 100kHz to 1MHz per Phase Programmable
Switching Frequency
♦ Oscillator Frequency Synchronization from
200kHz to 2MHz
♦ Hiccup Mode Overcurrent Protection
♦ Overtemperature Shutdown
♦ Thermally Enhanced 28-Pin TSSOP Package
Capable of Dissipating 1.9W
♦ Operates Over -40°C to +85°C or -40°C to +125°C
Temperature Range
MAX5066
Configurable, Single-/Dual-Output, Synchronous
Buck Controller for High-Current Applications
________________________________________________________________ Maxim Integrated Products 1
Ordering Information
19-3661; Rev 0; 5/05
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
PART TEMP RANGE PIN-PACKAGE
MAX5066EUI -40 ο C to +85 ο C 28 TSSOP
MAX5066AUI -40°C to +125°C 28 TSSOP