MAX5065 Datasheet, PDF (1/32 Pages) Maxim Integrated Products – Dual-Phase, +0.6V to +3.3V Output Parallelable, Average-Current-Mode Controllers

19-3035; Rev 1; 11/03
Dual-Phase, +0.6V to +3.3V Output Parallelable,
Average-Current-Mode Controllers
General Description
The MAX5065/MAX5067 dual-phase, PWM controllers
provide high-output-current capability in a compact
package with a minimum number of external compo-
nents. The MAX5065/MAX5067 utilize a dual-phase,
average-current-mode control that enables optimal use
of low R_DS(ON) MOSFETs, eliminating the need for exter-
nal heatsinks even when delivering high output currents.
Differential sensing enables accurate control of the out-
put voltage, while adaptive voltage positioning provides
optimum transient response. An internal regulator
enables operation with input voltage ranges of +4.75V to
+5.5V or +8V to +28V. The high switching frequency, up
to 500kHz per phase, and dual-phase operation allow
the use of low-output inductor values and input capacitor
values. This accommodates the use of PC board-
embedded planar magnetics achieving superior reliabili-
ty, current sharing, thermal management, compact size,
and low system cost.
The MAX5065/MAX5067 also feature a clock input
(CLKIN) for synchronization to an external clock, and a
clock output (CLKOUT) with programmable phase delay
(relative to CLKIN) for paralleling multiple phases. The
MAX5065/MAX5067 also limit the reverse current if the
bus voltage becomes higher than the regulated output
voltage. These devices are specifically designed to limit
current sinking when multiple power-supply modules are
paralleled. The MAX5065 offers an adjustable +0.6V to
+3.3V output voltage. The MAX5067 output voltage is
adjustable from +0.8V to +3.3V and features an overvolt-
age protection and a power-good output signal.
The MAX5065/MAX5067 operate over the extended
temperature range (-40°C to +85°C). The MAX5065 is
available in a 28-pin SSOP package. The MAX5067 is
available in a 44-pin thin QFN package. Refer to the
MAX5037A data sheet for a VRM 9.0/VRM 9.1-compati-
ble, VID-controlled output voltage controller in a 44-pin
QFN package.
Applications
Servers and Workstations
Point-of-Load High-Current/High-Density
Telecom DC-DC Regulators
Networking Systems
Large-Memory Arrays
RAID Systems
High-End Desktop Computers
Features
o +4.75V to +5.5V or +8V to +28V Input Voltage
Range
o Adjustable V_OUT
+0.6V to +3.3V (MAX5065)
+0.8V to +3.3V (MAX5067)
o Up to 60A Output Current
o Internal Voltage Regulator for a +12V or +24V
Power Bus
o Programmable Adaptive Output Voltage
Positioning
o True Differential Remote Output Sensing
o Out-of-Phase Controllers Reduce Input
Capacitance Requirement and Distribute Power
Dissipation
o Average-Current-Mode Control
Superior Current Sharing Between Individual
Phases and Paralleled Modules
Accurate Current Limit Eliminates MOSFET and
Inductor Derating
o Limits Reverse-Current Sinking in Paralleled
Modules
o Integrated 4A Gate Drivers
o Selectable Fixed Frequency 250kHz or 500kHz Per
Phase (Up to 1MHz for Two Phases)
o External Frequency Synchronization from 125kHz
to 600kHz
o Internal PLL with Clock Output for Paralleling
Multiple DC-DC Converters
o Thermal Protection
o 28-Pin SSOP Package (MAX5065)
o 44-Pin Thin QFN Package (MAX5067)
PART
MAX5065EAI
MAX5067ETH
Ordering Information
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
28 SSOP
44 Thin QFN
Selector Guide and Pin Configurations appear at end of
data sheet.
________________________________________________________________Maxim Integrated Products 1
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