PWM Controller With Wide VIN, Start-Up Into Pre-Bias Load

The ISL6420A simplifies the implementation of a complete control and protection scheme for a high-performance DC/DC buck converter. It is designed to drive N-Channel MOSFETs in a synchronous rectified buck topology, the ISL6420A integrates control, output adjustment, monitoring and protection functions into a single package. Additionally, the IC features an external reference voltage tracking mode for externally referenced buck converter applications and DDR termination supplies, as well as a voltage margining mode for system testing in networking DC/DC converter applications.
The ISL6420A provides simple, single feedback loop, voltage mode control with fast transient response. The output voltage of the converter CAN be precisely regulated to as low as 0.6V, with a maximum tolerance of 1.0% over temperature and line voltage variations. The operating frequency is fully adjustable from 100kHz to 1.4MHz. High frequency operation offers cost and space savings.
The error Amplifier features a 15MHz gain-bandwidth product and 6V/s slew rate that enables high converter bandwidth for fast transient response. The PWM duty cycle ranges from 0% to 100% in transient conditions. Selecting the capacitor value from the ENSS pin to ground sets a fully adjustable PWM soft-start. Pulling the ENSS pin LOW disables the controller.
The ISL6420A monitors the output voltage and generates a PGOOD (power good) signal when soft-start sequence is complete and the output is within regulation. A built-in overvoltage protection circuit prevents the output voltage from going above typically 115% of the set point. Protection from overcurrent conditions is provided by monitoring the rDS(ON) of the upper MOSFET to inhibit the PWM operation appropriately. This approach simplifies the implementation and improves efficiency by eliminating the need for a current sensing resistor.
By Intersil Corporation
Part Manufacturer Description Datasheet Samples
ISL6420AIRZ-TK Renesas Electronics Corporation $ Operates From: $$ 4.5V to 5.5V Input $$ 5.5V to 28V Input $ 0.6V Internal Reference Voltage $$ ±1.0% Reference Accuracy $ Resistor-Selectable Switching Frequency $$ 100kHz to 1.4MHz $ Voltage Margining and External Reference Tracking Modes $ Output can Sink or Source Current $ Lossless, Programmable Overcurrent Protection $$ Uses Upper MOSFET's rDS(ON) $ Programmable Soft-Start $ Drives N-Channel MOSFETs $ Simple Single-Loop Control Design $$ Voltage-Mode PWM Control $ Fast Transient Response $$ High-Bandwidth Error Amplifier $$ Full 0% to 100% Duty Cycle $ Extensive Circuit Protection Functions $$ PGOOD, Overvoltage, Overcurrent, Shutdown $ Diode Emulation during Startup for Pre-Biased Load Applications $ Offered in 20 Ld QFN and QSOP Packages $ QFN (4x4) Package $$ QFN compliant to JEDEC PUB95 MO-220 QFN -Quad Flat No Leads - Product Outline $$ QFN Near Chip Scale Package Footprint; Improves PCB Efficiency, Thinner in Profile $ Pb-Free (RoHS Compliant)
ISL6420AEVAL3Z Renesas Electronics Corporation Advanced Single Synchronous Buck Pulse Width Modulation (PWM) Controller
ISL6420AIRZ Renesas Electronics Corporation $ Operates From: $$ 4.5V to 5.5V Input $$ 5.5V to 28V Input $ 0.6V Internal Reference Voltage $$ ±1.0% Reference Accuracy $ Resistor-Selectable Switching Frequency $$ 100kHz to 1.4MHz $ Voltage Margining and External Reference Tracking Modes $ Output can Sink or Source Current $ Lossless, Programmable Overcurrent Protection $$ Uses Upper MOSFET's rDS(ON) $ Programmable Soft-Start $ Drives N-Channel MOSFETs $ Simple Single-Loop Control Design $$ Voltage-Mode PWM Control $ Fast Transient Response $$ High-Bandwidth Error Amplifier $$ Full 0% to 100% Duty Cycle $ Extensive Circuit Protection Functions $$ PGOOD, Overvoltage, Overcurrent, Shutdown $ Diode Emulation during Startup for Pre-Biased Load Applications $ Offered in 20 Ld QFN and QSOP Packages $ QFN (4x4) Package $$ QFN compliant to JEDEC PUB95 MO-220 QFN -Quad Flat No Leads - Product Outline $$ QFN Near Chip Scale Package Footprint; Improves PCB Efficiency, Thinner in Profile $ Pb-Free (RoHS Compliant)
ISL6420AEVAL1Z Renesas Electronics Corporation Advanced Single Synchronous Buck Pulse Width Modulation (PWM) Controller
ISL6420A 's PackagesISL6420A 's pdf datasheet
ISL6420AIAZ QSOP
ISL6420AIAZ-TK QSOP
ISL6420AIR QFN
ISL6420AIR-TK QFN
ISL6420AIRZ QFN
ISL6420AIRZ-TK QFN




ISL6420A Pinout, Pinouts
ISL6420A pinout,Pin out
This is one package pinout of ISL6420A,If you need more pinouts please download ISL6420A's pdf datasheet.

ISL6420A Application circuits
ISL6420A circuits
This is one application circuit of ISL6420A,If you need more circuits,please download ISL6420A's pdf datasheet.


Related Electronics Part Number

Related Keywords:

ISL6420A Pb-Free ISL6420A Cross Reference ISL6420A Schematic ISL6420A Distributor
ISL6420A Application Notes ISL6420A RoHS ISL6420A Circuits ISL6420A footprint