The MAX5065/MAX5067 dual-phase, PWM controllers provide high-output-current capability in a compact package with a minimum number of external components. The MAX5065/MAX5067 utilize a dual-phase, average-current-mode control that enables optimal use of low RDS(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 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 reliability, 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 overvoltage 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-compatible, VID-controlled output voltage controller in a 44-pin QFN package.
Applications
- High-End Desktop Computers
- Large-Memory Arrays
- Networking Systems
- Point-of-Load High-Current/High-Density Telecom DC-DC Regulators
- RAID Systems
- Servers and Workstations
