MAX5037A Datasheet, PDF (1/31 Pages) Maxim Integrated Products – VRM 9.0/VRM 9.1, Dual-Phase, Parallelable, Average-Current-Mode Controller

19-3033; Rev 1; 4/04
VRM 9.0/VRM 9.1, Dual-Phase,
Parallelable, Average-Current-Mode Controller
General Description
The MAX5037A dual-phase, PWM controller provides
high-output-current capability in a compact package
with a minimum number of external components. The
MAX5037A utilizes a dual-phase, average-current-mode
control that enables optimal use of low R_DS(ON)
MOSFETs, eliminating the need for external heatsinks
even when delivering high output currents.
Differential sensing enables accurate control of the
output voltage, while adaptive voltage positioning
provides optimum transient response. An internal regula-
tor enables operation with either +5V or +12V input volt-
age without the need for additional voltage sources. The
high switching frequency, up to 500kHz per phase, and
dual-phase operation allow the use of low output induc-
tor values and input capacitor values. This accommo-
dates the use of PC board-embedded planar magnetics
achieving superior reliability, current sharing, thermal
management, compact size, and low system cost.
The MAX5037A also features 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 MAX5037A
also limits the reverse current in case the bus voltage
becomes higher than the regulated output voltage.
The MAX5037A operates over the extended temperature
range (-40°C to +85°C) and is available in 44-pin MQFP
or thin QFN packages. Refer to the MAX5038A/
MAX5041A and MAX5065/MAX5067 data sheets for
either a fixed output voltage controller or an adjustable
output voltage controller in an SSOP or thin 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
♦ Internal 5-Bit DAC VID Control (VRM 9.0/VRM 9.1
Compliant, 0.8% Accuracy)
♦ Programmable Adaptive Output Voltage
Positioning
♦ True Differential Remote Output Sensing
♦ 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
♦ Limits Reverse-Current Sinking in Paralleled
Modules
♦ Integrated High-Output-Current Gate Drivers
♦ Selectable Fixed Frequency 250kHz or 500kHz per
Phase (Up to 1MHz for Two Phases)
♦ External Frequency Synchronization from 125kHz
to 600kHz
♦ Internal PLL with Clock Output for Paralleling
Multiple DC-DC Converters
♦ Power-Good Output
♦ Phase Failure Detector
♦ Overvoltage and Thermal Protection
♦ 44-Pin MQFP or Thin QFN Packages
PART
MAX5037AEMH
MAX5037AETH
Ordering Information
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
44 MQFP
44 Thin QFN
Pin Configuration appears at end of data sheet.
________________________________________________________________ Maxim Integrated Products 1
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.