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MAXREFDES1233: 1.8V/10A Core Power Supply for CPUs, Microcontrollers, FPGAs, or DDR2 Interfaces Using the MAX20710

MAXREFDES1233

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Description

Input Type VIN (MIN)
(V)
VIN (MAX)
(V)
IOUT
(A)
Single/Multiple
Output
VOUT
(V)
POUT
(W)
Isolated/Non-Isolated Topology
DC 11.4 12.6 10 Single 1.8 18 Non-Isolated Buck

The MAXREFDES1233 provides the internal core voltage (VCCINT) for CPUs, microcontrollers, FPGAs, or DDR2 interfaces. This reference design targets CPUs, microcontrollers, FPGAs, or DDR2 interfaces that require 1.8V for VCCINT from a 12V intermediary bus. The converter supports a maximum load of 10A at a 600kHz switching frequency. The MAXREFDES1233 is centered around the MAX20710 step-down regulator, which is configured for standalone operation. However, the PMBus interface allows for monitoring and control of various converter parameters. All circuitry for the PMBus interface is provided and the MAXPOWERTOOL002# can be used to communicate with the MAXREFDES1233.

The MAXREFDES1233 uses the MAX20710 synchronous step-down regulator. The internal FETs and control loop compensation allow for a compact design with minimal external resources. Additionally, the differential sense lines allow for accurate sensing of the CPU core voltage when located remotely from the MAX20710 IC. The loop gain is selectable to allow design flexibility between stability and output capacitance. A programmable soft-start limits inrush currents during startup. The MAX20710 also offers protections such as input UVLO, output overvoltage/undervoltage alerts, output overvoltage protection, over-temperature, and current limiting. Moreover, the PMBus interface allows additional parameters to be monitored such as input voltage, output voltage, output current, and temperature. For a full list of PMBus commands, see Application Note 6042.

Features

  • PMBus Interface
  • Soft-Start
    • Protections
    • Output under/over-voltage alert
    • Current limit and short-circuit protection
    • Input UVLO at 3.9V
    • Over-temperature protection

The MAXREFDES1233 provides the internal core voltage (V<sub>CCINT</sub>) for CPUs, microcontrollers, FPGAs, or DDR2 interfaces.

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Designed, Built, Tested

Board pictured here has been fully assembled and tested. Not available for sale.

 

Parametrics

Input Type Vin(Min) Vin(Max) Iout(Max) Single/Multiple Output Vout(V) Pout(W) Isolated/Non-Isolated Topology
DC 11.4 12.6 10 - 1.8 18 Non-Isolated -

Parametrics

Input Type DC
Vin(Min) 11.4
Vin(Max) 12.6
Iout(Max) 10
Single/Multiple Output -
Vout(V) 1.8
Pout(W) 18
Isolated/Non-Isolated Non-Isolated
Topology -

Maxim Devices (1)

Part Number Name Product Family Order Design kits and evaluation modules
MAX20710 Integrated, Step-Down Switching Regulator with PMBus Switching Regulator - Switching Regulators Buy Now Design Kits

Maxim Devices (1)

Part Number Product Family
Switching Regulator - Switching Regulators
Integrated, Step-Down Switching Regulator with PMBus

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