MAX5038 Datasheet, PDF (1/26 Pages) Maxim Integrated Products – Dual-Phase, Parallelable, Average Current-Mode Controllers

19-2514; Rev 3; 8/04
Dual-Phase, Parallelable, Average Current-Mode
Controllers
General Description
The MAX5038/MAX5041 dual-phase, PWM controllers
provide high-output-current capability in a compact
package with a minimum number of external compo-
nents. The MAX5038/MAX5041 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 MAX5038/MAX5041 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
MAX5038 offers a variety of factory-trimmed preset output
voltages (see Selector Guide) and the MAX5041 offers an
adjustable output voltage from +1.0V to +3.3V.
The MAX5038/MAX5041 operate over the extended
industrial temperature range (-40°C to +85°C) and are
available in a 28-pin SSOP package. Refer to the
MAX5037 data sheet for a VRM 9.0-compatible, VID-
controlled output voltage controller in a 44-pin MQFP or
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
♦ +4.75V to +5.5V or +8V to +28V Input Voltage
Range
♦ Up to 60A Output Current
♦ Internal Voltage Regulator for a +12V or +24V
Power Bus
♦ True Differential Remote Output Sensing
♦ Two Out-Of-Phase Controllers Reduce Input
Capacitance Requirement and Distribute Power
Dissipation
♦ Average Current-Mode Control
Superior Current Sharing Between Individual
Phases and Paralleled Modules
Accurate Current Limit Eliminates MOSFET and
Inductor Derating
♦ Integrated 4A Gate Drivers
♦ Selectable Fixed Frequency 250kHz or 500kHz Per
Phase (Up to 1MHz for 2 Phases)
♦ Fixed (MAX5038) or Adjustable (MAX5041) Output
Voltages
♦ 0.5% Accurate Reference (MAX5041B)
♦ External Frequency Synchronization from 125kHz
to 600kHz
♦ Internal PLL with Clock Output for Paralleling
Multiple DC-DC Converters
♦ Thermal Protection
♦ 28-Pin SSOP Package
Ordering Information
PART
TEMP RANGE ^PIN-
OUTPUT
PACKAGE VOLTAGE
MAX5038EAI12
MAX5038EAI15
MAX5038EAI18
MAX5038EAI25
MAX5038EAI33
-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
Fixed +1.2V
Fixed +1.5V
Fixed +1.8V
Fixed +2.5V
Fixed +3.3V
MAX5041EAI
-40°C to +85°C 28 SSOP ^{Adj +1.0V to}
+3.3V
MAX5041BEAI -40°C to +85°C 28 SSOP ^{Adj +1.0V to}
+3.3V
Pin Configuration appears at end of data sheet.
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