Multi-output products that incorporate multiple switchers and/or linears in a single package are an excellent choice for PowerPC 4XX or 7XX-based designs. These combination devices can provide all the voltages required for a single IC or board, and they can be adjusted to provide the optimum responses for the end application. Good layout and bypassing techniques plus excellent on-chip isolation prevent the supplies from interacting. The ISL6521 can provide the required currents and voltages in a 16-pin SOIC package with minimal external components. The ISL6521 implements a highly efficient synchronous buck design and in addition includes three linear regulators, which can provide the I/O voltage and additional voltages to the board. Currents less than 120mA can be supplied directly from the linear regulator drive pins (as shown here for AV_DD) or they can be used to control an external transistor (as shown here for OV_DD and VOTHER). The example shown here has V_DD = 1.5V, OV_DD = 2.5V and AV_DD = 1.5V, but all output voltages are programmable from 0.8V to 4.5V.

Block Diagram of Power Solution Design

HIGHLY INTEGRATED ISL6521-BASED SOLUTION

Related Documentation

• ISL6521 Information Page
  • ISL6521 Data Sheet
• iSIM Simulation Tools
• Power Management Applications Guide for IBM PowerPCs
• Power Management Product Families