Renesas Electronics ISL85403 Synchronous Buck/Boost Buck Converter
Renesas Electronics ISL85403 Synchronous Buck or Boost Buck Converter is a 36V, 2.5A synchronous buck or boost buck controller with a high-side MOSFET and low-side driver integrated. In buck mode, the ISL85403 supports a wide input range of 3V to 36V. In boost-buck mode, the input range can be extended down to 2.5V, and output regulation can be maintained when VIN drops below VOUT, enabling sensitive electronics to remain on in low input voltage conditions. The ISL85403 has a flexible selection of operation modes of forced PWM mode and PFM mode. In PFM mode, the quiescent input current is as low as 180μA (AUXVCC connected to VOUT). The load boundary between PFM and PWM can be programmed to cover wide applications.
Features
- Buck mode: input voltage range 3V to 36V
- Boost mode expands operating input voltage lower than 2.5V
- Selectable forced PWM mode or PFM mode
- 300μA IC quiescent current (PFM, no load); 180μA input quiescent current (PFM, no-load, VOUT tied to AUXVCC)
- Less than 5μA (MAX) shutdown input current (IC disabled)
- Operational topologies
- Synchronous buck
- Non-synchronous buck
- Two-stage boost buck
- Non-inverting single inductor buck-boost
- Programmable frequency from 200kHz to 2.2MHz and frequency synchronization capability
- ±1% tight voltage regulation accuracy
- Reliable overcurrent protection
- Temperature-compensated current sense
- Cycle-by-cycle current limiting with frequency foldback
- Hiccup mode for worst-case short condition
- 20 Ld 4x4 QFN package
- Pb-free (RoHS compliant)
Applications
- General-purpose
- 24V bus power
- Battery power
- Point of load
- Embedded processor and I/O supplies
Typical Application Circuit
Associated Tool
Renesas Electronics ISL85403EVAL1Z Evaluation Board
Quickly evaluates ISL85403 in the 2-stage boost-buck and the synchronous buck configurations.
Published: 2014-04-17
| Updated: 2022-03-11