The ISL85403 is a 40V, 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 40V. 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.
The low-side driver can be either used to drive an external low-side MOSFET for a synchronous buck or left unused for a standard non-synchronous buck. The low-side driver can also be used to drive a boost converter as a preregulator followed by a buck controlled by the same IC, which greatly expands the operating input voltage range down to 2.5V or lower (Refer to “Typical Application Schematic III - Boost Buck Converter” on page 6).
The ISL85403 offers the most robust current protections. It uses peak current mode control with cycle-by-cycle current limiting. It is implemented with frequency foldback under current limit condition; also, the hiccup overcurrent mode is also implemented to guarantee reliable operations under harsh short conditions. The ISL85403 has comprehensive protections against various faults including overvoltage and over-temperature protections, etc.
IC REG MULT CONFG ADJ 2.5A 20QFN Product overview: ISL85403FRZ-T7A from Renesas Electronics Corporation is a Voltage Regulator IC for stable power rails, DC-DC conversion, battery-powered electronics, automotive modules, and embedded power management. It is useful for engineers and buyers comparing datasheets, replacement parts, BOM lines, package options, lifecycle status, and procurement availability. Key searchable attributes include 2.5A. Search-friendly keywords include voltage regulator, LDO, buck converter, boost converter, power rail, 2.5A, Voltage Regulator IC, DC Switching Voltage Regulators. This listing supports clearer product discovery for industrial, commercial, repair, automation, power, sensing, and embedded system projects. Product number 739-ISL85403FRZ-T7A can be used for catalog matching and distributor lookup.
Manufacturer: Intersil
Win Source Part Number: 777442-ISL85403FRZ-T
Packaging: Reel package
Operating Temperature Range: -40°C ~ 105°C (TA)
Package: 20-VFQFN Exposed Pad
Mounting: SMD
Output Type: Adjustable
Function: Step-Up, Step-Down, Step-Up/Step-Down
Topology: Buck, Boost, Buck-Boost
Frequency - Switching: 200kHz ~ 2.2MHz
Number of Outputs: 1
Output Configuration: Positive
Synchronous Rectifier: Both
Output Current: 2.5A
Family Name: ISL85403
Output Voltage: 0.5V
Categories: Integrated Circuits (ICs)
Manufacturer Package: 20-QFN (4x4)
Output Voltage MAX: 36V
Input Voltage MIN: 3V
Voltage Input MAX: 40V
ECCN: EAR99
Country of Origin: Malaysia
Estimated EOL Date: 2029
Popularity: Medium
Fake Threat In the Open Market: 42 pct.
Supply and Demand Status: Limited
Quantity per package: 250
ISL85403FRZ-T Full Industrial, 250pc. Re
ISL85403FRZ-T Full Industrial, 250pc. Re
ISL85403FRZ-T Full Industrial, 250pc. Re
Buck, Boost, Buck-Boost Switching Regulator IC Positive Adjustable 0.5V 1 Output 2.5A 20-VFQFN Exposed Pad
Buck, Boost, Buck-Boost Switching Regulator IC Positive Adjustable 0.5V 1 Output 2.5A 20-VFQFN Exposed Pad
Buck, Boost, Buck-Boost Switching Regulator IC Positive Adjustable 0.5V 1 Output 2.5A 20-VFQFN Exposed Pad
IC REG MULT CONFG ADJ 2.5A 20QFN
IC REG MULT CONFG ADJ 2.5A 20QFN
Buck, Boost, Buck-Boost Switching Regulator IC Positive Adjustable 0.5V 1 Output 2.5A 20-VFQFN Exposed Pad
Switching Voltage Regulators Reg w/FET f/ Synch Buck or Boost/Buck
IC REG MULT CONFG ADJ 2.5A 20QFN
| Renesas Electronics Corporation | ERSAELECTRONICS PTE. LTD. | Win Source Electronics | RS Components, Ltd. | DigiKey | ODG (Origin Data Global) | Shenzhen Shengyu Electronics Technology Limited | Quarktwin Technology Ltd. | VAST STOCK CO., LIMITED | Lingto Electronic Limited | |
|---|---|---|---|---|---|---|---|---|---|---|
| Product Category | IC Switching Voltage Regulators | IC Switching Voltage Regulators | IC Switching Voltage Regulators | IC Switching Voltage Regulators | IC Switching Voltage Regulators | IC Switching Voltage Regulators | IC Switching Voltage Regulators | IC Switching Voltage Regulators | IC Switching Voltage Regulators | IC Switching Voltage Regulators |
| Product Number | ISL85403FRZ-T7A | 739-ISL85403FRZ-T7A | 777442-ISL85403FRZ-T7A | 2561664 | ISL85403FRZ-T7ACT-ND | ISL85403FRZ-T7A | ISL85403FRZ-T7A | ISL85403FRZ-T7A | ISL85403FRZ-T7A | ISL85403FRZ-T7A |
| Product Name | 2.5A Regulator with Integrated High-Side MOSFET for Synchronous Buck or Boost Buck Converter | 2.5A Voltage Regulator IC | PMIC - PMIC - Voltage Regulators - DCDC Switching Regulators - ISL85403FRZ-T7A | Voltage Regulators | Voltage Regulators - DC DC Switching Regulators | Voltage Regulators - DC DC Switching Regulators | Integrated Circuits (ICs) - Power Management (PMIC) - Voltage Regulators - DC DC Switching Regulators | Voltage Regulators - DC DC Switching Regulators | Switching Voltage Regulators | PMIC - Voltage Regulators - DC DC Switching Regulators |
| Configuration / Function | Buck; Boost | Buck; Boost; Buck, Boost, Buck-Boost | Buck; Boost | Buck; Boost; Buck-Boost | Buck; Boost | |||||
| Package Type | Other; QFN | Other; Tape & Reel (TR) | Other; 20-VFQFN Exposed Pad | Other; 20-VFQFN Exposed Pad | Other; 20-VFQFN Exposed Pad | Other; 20-VFQFN Exposed Pad | ||||
| Special Features | Synchronous Rectification | Multiple Outputs; Synchronous Rectification | Synchronous Rectification | |||||||
| Output Voltage | 0.8000 to 36 volts | 0.8000 to 33 volts | 0.5000 volts | 0.5000 to 36 volts | 0.5000 volts | 0.5000 volts | 0.5000 to 36 volts | |||
| IOUT | 2.5 amps | 2.5 amps | 2.5 amps | 0.8000 amps | 2.5 amps | 2.5 amps | 2.5 amps | 2.5 amps | 2.5 amps |
