Specification	ISL85403FRZ-T

Current - Output	2.5 A
Frequency - Switching [Max]	2.2 MHz
Frequency - Switching [Min]	200 kHz
Function	Step-Up, Step-Up/Step-Down, Step-Down
Mounting Type	Surface Mount
Number of Outputs	1
Operating Temperature [Max]	105 °C
Operating Temperature [Min]	-40 °C
Output Configuration	Positive
Output Type	Adjustable
Package / Case	20-VFQFN Exposed Pad
Supplier Device Package	20-QFN (4x4)
Topology	Boost, Buck, Buck-Boost
Voltage - Input (Min) [Min]	3 V
Voltage - Output (Max)	36 V
Voltage - Output (Min/Fixed) [Min]	0.5 V

ISL85403 Series

Part	Mounting Type	Operating Temperature [Max]	Operating Temperature [Min]	Frequency - Switching [Max]	Frequency - Switching [Min]	Voltage - Output (Max)	Number of Outputs	Package / Case	Function	Voltage - Input (Min) [Min]	Supplier Device Package	Output Configuration	Topology	Output Type	Voltage - Output (Min/Fixed) [Min]	Current - Output	Outputs and Type	Outputs and Type	Voltage - Input [Min]	Voltage - Input [Max]	Utilized IC / Part	Frequency - Switching	Board Type	Supplied Contents	Regulator Topology	Main Purpose	Voltage - Output
Renesas Electronics Corporation ISL85403FRZ-T	Surface Mount	105 °C	-40 °C	2.2 MHz	200 kHz	36 V	1	20-VFQFN Exposed Pad	Step-Down Step-Up Step-Up/Step-Down	3 V	20-QFN (4x4)	Positive	Boost Buck Buck-Boost	Adjustable	0.5 V	2.5 A
Renesas Electronics Corporation ISL85403EVAL1Z																2.5 A	Non-Isolated	1	4 V	40 V	ISL85403	500 kHz	Fully Populated	Board(s)	Buck-Boost	DC/DC Step Up or Down	5 V

Pricing

Prices provided here are for design reference only. For realtime values and availability, please visit the distributors directly

Distributor	Package	Quantity	$

Digikey	Tape & Reel (TR)	6000	$ 2.21

Description

General part information

ISL85403 Series

The ISL85403 is a 40V, 2. 5A synchronous buck or boost-buck controller with an integrated high-side MOSFET and low-side driver. 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 VINdrops below VOUT, enabling sensitive electronics to remain on in low input voltage conditions. The ISL85403 has a flexible selection 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 either be 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. ISL85403 offers robust current protection. 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 ensures reliable operations under harsh short conditions. The ISL85403 has comprehensive protections against various faults including overvoltage and over-temperature protection.

Documents

Technical documentation and resources