MAX5038A Datasheet, PDF (1/26 Pages) Maxim Integrated Products – Dual-Phase, Parallelable, Average-Current-Mode Controllers

19-3034; Rev 0; 10/03
Dual-Phase, Parallelable, Average-Current-Mode
Controllers
General Description
The MAX5038A/MAX5041A dual-phase, PWM controllers
provide high-output-current capability in a compact
package with a minimum number of external compo-
nents. The MAX5038A/MAX5041A 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 MAX5038A/MAX5041A 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
MAX5038A/MAX5041A also limit the reverse current in
case the bus voltage becomes higher than the regulat-
ed output voltage. The MAX5038A offers a variety of fac-
tory-trimmed preset output voltages (see Selector Guide)
and the MAX5041A offers an adjustable output voltage
between +1.0V to +3.3V.
The MAX5038A/MAX5041A operate over the extended
temperature range (-40°C to +85°C) and are available
in a 28-pin SSOP package. Refer to the MAX5037A and
MAX5065/MAX5067 data sheets for a VRM 9.0/VRM 9.1-
compatible, VID-controlled, adjustable output voltage
controller in a 44-pin MQFP/thin QFN or 28-pin SSOP
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 Up to 60A Output Current
o Internal Voltage Regulator for a +12V or +24V
Power Bus
o True Differential Remote Output Sensing
o Two 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 Fixed (MAX5038A) or Adjustable (MAX5041A)
Output Voltages
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
Ordering Information
PART
TEMP RANGE
PIN-
PACKAGE
OUTPUT
VOLTAGE
(V)
MAX5038AEAI12
MAX5038AEAI15
MAX5038AEAI18
MAX5038AEAI25
MAX5038AEAI33
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
28 SSOP
28 SSOP
28 SSOP
28 SSOP
28 SSOP
MAX5041AEAI -40°C to +85°C 28 SSOP
Fixed +1.2
Fixed +1.5
Fixed +1.8
Fixed +2.5
Fixed +3.3
Adj +1.0 to
+3.3
Pin Configuration appears at end of data sheet.
________________________________________________________________Maxim Integrated Products 1
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