ISL8225M Intersil Step-Down Power Module Data Sheet

Download Datasheet for Intersil ISL8225M Dual 15A / Single 30A Step-Down Power Module [28 pages FN7822.0 2012 pdf/zip]

SKU: ISL8225MINTERSILDS2012 Category: Brand:

Description

The ISL8225M is a fully-encapsulated step-down switching power supply that can deliver up to 100W output power from a small 17mm square PCB footprint. The two 15A outputs may be used independently or combined to deliver a single 30A output. Designing a high-performance board-mounted power supply has never been simpler – only a few external components are needed to create a very dense and reliable power solution.
Automatic current sharing and phase interleaving allow up to six modules to be paralleled for 180A output capability. 1.5% output voltage accuracy, differential remote voltage sensing and fast transient response create a very high-performance power system. Built-in output over-voltage, over-current and over-temperature protection enhance system reliability.
The ISL8225M is available in a thermally-enhanced QFN package. Excellent efficiency and low thermal resistance permit full power operation without heat sinks or fans. In addition, the QFN package with external leads permits easy probing and visual solder inspection.

DATASHEET
TABLE OF CONTENTS:

FEATURES
– Fully-encapsulated dual step-down switching power supply
– Up to 100W output from a 17mm square PCB footprint
– Dual 15A or single 30A output
– Up to 95% conversion efficiency
– 4.5V to 20V input voltage range
– 0.6V to 6V output voltage range
– 1.5% output voltage accuracy with differential remote sensing
– Up to six modules may be paralleled to support 180A output current
– Output over-voltage, over-current and over-temperature protection
– Full power operation without heat sinks or fans
– QFN package with exposed leads permits easy probing and visual solder inspection

APPLICATIONS
– Computing, networking and telecom infrastructure equipment
– Industrial and medical equipment
– General purpose point-of-load (POL) power

Figure 1. COMPLETE 30A STEP-DOWN POWER SUPPLY

Figure 2. SMALL FOOTPRINT WITH HIGH POWER DENSITY

ISL8225M PINOUT INTERNAL CIRCUIT

ORDERING INFORMATION

ISL8225M PIN CONFIGURATION

ISL8225M PIN DESCRIPTIONS

ABSOLUTE MAXIMUM RATINGS

THERMAL INFORMATION

RECOMMENDED OPERATING CONDITIONS

ELECTRICAL SPECIFICATIONS

TYPICAL PERFORMANCE CHARACTERISTICS
– Efficiency Performance
– Transient Response Performance
– Start-up and Short Circuit Performance

TYPICAL APPLICATION CIRCUITS

Figure 18. DUAL OUTPUTS FOR 1.2V/15A AND 1.5V/15A
Figure 19. PARALLEL USE FOR SINGLE 1.5V/30A OUTPUT
Figure 20. DDR/TRACKING USE
Figure 21. HIGH OUTPUT VOLTAGE APPLICATION WITH THE FREQUENCY SET AT 900kHz
Figure 22. 4-PHASE PARALLELED AT 1.5V/60A WITH 90 deg INTERLEAVING
Figure 23. 3-PHASE PARALLELED AT 1.5V/40A AND 1-PHASE AT 5V/10A OUTPUT WITH 90 deg INTERLEAVING
Figure 24. SIX-PHASE 90A 1.2V OUTPUT CIRCUIT

Table 1. ISL8225M DESIGN GUIDE MATRIX
Table 2. RECOMMENDED I/O CAPACITOR IN Table 1
Table 3. ISL8225M OPERATION MODES

APPLICATION INFORMATION
– Programming the Output Voltage
– Selection of Input Capacitor
– Selection of Output Capacitors
– EN/FF Turn ON/OFF
– Thermal Considerations

Figure 26. SIMPLIFIED ENABLE AND VOLTAGE FEED-FORWARD CIRCUIT

FUNCTIONAL DESCRIPTION
– Initialization
– Enable and Voltage Feed-forward
– Soft-Start
– Power-Good
– Current Share
– Over-voltage Protection (OVP)
– Over-Temperature Protection (OTP)
– Over-current Protection (OCP)
– Frequency Synchronization and Phase Lock Loop
– Tracking Function
– Mode Programming

Figure 27. Soft-Start With Vout = 0V
Figure 28. Soft-Start With Vout < Target Voltage
Figure 29. Soft-Start With Vout Below 113% But Above Final Target Voltage
Figure 31. Rsync vs Switching Frequency

Table 5. Phase-Shift Setting
Table 6. Clkout To Program Phase Shift At Dual-Output

– Layout Guide

Figure 32. Recommended Layout

– Current Derating
– Package Description
– PCB Layout Pattern Design
– Thermal Vias
– Stencil Pattern Design
– Derating Curves
– Reflow Parameters
– Package Outline Drawing