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.
Buck, Boost, Buck-Boost Switching Regulator IC Positive Adjustable 0.5V 1 Output 2.5A 20-VFQFN Exposed Pad
Win Source Part Number: 1354512-ISL85403FRZ-
Category: Integrated Circuits (ICs) - Power Management (PMIC) - Voltage Regulators - DC DC Switching Regulators
Package: Tape & Reel
Temperature Range - Operating: -40°C ~ 105°C (TA)
Fake Threat In the Open Market: 34 pct.
MSL Level: 1 (Unlimited)
Mfr: Renesas Electronics America Inc
Product Status: Active
Package / Case: 20-VFQFN Exposed Pad
Supplier Device Package: 20-QFN (4x4)
Base Product Number: ISL85403
Mounting Type: Surface Mount
HTSUS: 8542.39.0001
REACH Status: REACH Unaffected
ECCN: EAR99
Function: Step-Up, Step-Down, Step-Up/Step-Down
Output Type: Adjustable
Output Configuration: Positive
Voltage - Input (Max): 40V
Voltage - Output (Min/Fixed): 0.5V
Voltage - Output (Max): 36V
Current - Output: 2.5A
Topology: Buck, Boost, Buck-Boost
Number of Outputs: 1
Voltage - Input (Min): 3V
Frequency - Switching: 200kHz ~ 2.2MHz
Synchronous Rectifier: Both
IC REG MULT CONFG ADJ 2.5A 20QFN Product overview: ISL85403FRZ-TK 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-TK can be used for catalog matching and distributor lookup.
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 ISL85403FRZ-T Full Industrial, 1K Tape and Reel
IC REG MULT CONFG ADJ 2.5A 20QFN
| Renesas Electronics Corporation | DigiKey | Win Source Electronics | ERSAELECTRONICS PTE. LTD. | 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 |
| Product Number | ISL85403FRZ-TK | ISL85403FRZ-TK-ND | 1354512-ISL85403FRZ-TK | 739-ISL85403FRZ-TK | ISL85403FRZ-TK | ISL85403FRZ-TK | ISL85403FRZ-TK | ISL85403FRZ-TK |
| Product Name | 2.5A Regulator with Integrated High-Side MOSFET for Synchronous Buck or Boost Buck Converter | Voltage Regulators - DC DC Switching Regulators | Integrated Circuits (ICs) - Power Management (PMIC) - Voltage Regulators - DC DC Switching Regulators | 2.5A Voltage Regulator IC | 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 | |||||
| Package Type | Other; QFN | Other; 20-VFQFN Exposed Pad | Other; Tape & Reel | Other; Tape & Reel (TR) | Other; 20-VFQFN Exposed Pad | |||
| Special Features | Synchronous Rectification | Synchronous Rectification | Multiple Outputs; Synchronous Rectification | |||||
| Output Voltage | 0.8000 to 36 volts | 0.5000 to 36 volts | 0.8000 to 33 volts | 1 volts | 0.5000 to 36 volts | |||
| IOUT | 2.5 amps | 2.5 amps | 2.5 amps | 2.5 amps | 2.5 amps |
