ISL91301BIIZ-TR5946

Voltage Regulators - DC DC Switching Regulators Overview

The ISL91301BIIZ-TR5946 is a quad output single-phase programmable power management IC (PMIC) from Renesas. It integrates four buck controllers capable of delivering 3A per phase for supply voltages between 2.5V and 5.5V when VIN_SEL is grounded, or 4A per phase for 2.8V to 5.5V when VIN_SEL equals AVIN. The device features a compact 42-ball WLCSP package with 0.4mm pitch measuring 2.570mm x 2.919mm. It supports I2C programmable outputs from 0.3V to 2V, independent dynamic voltage scaling, and PWM frequencies from 2MHz to 6MHz.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Integrates four buck controllers with reconfigurable power stages for flexible multiphase and single-phase operations.
• Delivers high efficiency up to 93% at 3.8V input and 1.8V output conditions.
• Features automatic diode emulation and pulse skipping modes under light-load conditions to maximize battery life.
• Includes robust fault detection mechanisms such as UV, OV, OC, OT, and short-circuit protection.

Voltage Regulators - DC DC Switching Regulators Applications

• Portable electronic devices requiring small solution size and high output power
• Battery-powered systems needing extended operational life through efficient light-load management
• Applications requiring independent dynamic voltage scaling for multiple rails

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the specific suffix TR5946 against official Renesas documentation to confirm tape and reel packaging specifications. Ensure compatibility with the 42-ball WLCSP footprint during PCB layout. Confirm that the VIN_SEL pin configuration matches the required current rating (3A vs 4A per phase) for your design constraints.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when a single-chip solution for four output rails is required to minimize board space. It is suitable for designs where input voltages range from 2.5V to 5.5V and precise output regulation within ±0.7% system accuracy is necessary. Consider the WLCSP package constraints for thermal management and assembly capabilities.

Voltage Regulators - DC DC Switching Regulators Part Context

This part belongs to the ISL91301 family of programmable PMICs. The 'B' variant specifically denotes the quad-output single-phase configuration, distinct from the 'A' variant which offers triple output with a 2+1+1 phase structure. Both variants share the same core controller technology and package options.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

The ISL91301AIIZ-TR5946 serves as a functional alternative if a 2+1+1 phase configuration is acceptable instead of quad single-phase. Verify pin-to-pin compatibility and software register settings before substitution.

Voltage Regulators - DC DC Switching Regulators FAQ

How does the VIN_SEL pin affect the output current capability?

When VIN_SEL is connected to AVIN, the device delivers 4A per phase for supply voltages between 2.8V and 5.5V. When VIN_SEL is connected to GND, it delivers 3A per phase for a wider supply voltage range of 2.5V to 5.5V.

What is the maximum operating frequency supported by this IC?

The PWM frequency is programmable via I2C and can be set anywhere from 2MHz to 6MHz.