News & Events
Intersil Releases Small PWM Controller/Driver IC with Big Features and Performance
-- Highly integrated IC provides wide flexibility, full features and significant cost savings
MILPITAS, CA, February 12, 2004 Intersil Corporation (NASDAQ: ISIL), a world leader in the design and manufacture of high performance analog solutions, today announced the new Endura ISL6420 single-phase synchronous-buck pulse-width modulation (PWM) controller with integrated MOSFET drivers. This new high-performance IC integrates control, protection, monitoring and output adjustment all in one very small 4x4mmquad flat no-lead (QFN) package. The ISL6420 is ideal for a wide range of applications including, but not limited to, core power for FPGAs, ASICs, DSPs, embedded controllers and microprocessors, as well as for Ethernet routers and switchers, distributed DC/DC conversion and tracking external reference buck converters. In every application, the ISL6420 provides designers with precision, flexibility and reliability along with space and cost savings.
We believe the ISL6420 will be very well received in the market, said Randy Roberts, Director of Intersils Broadband Power Products. It will be sought after by many of our largest customers because the ISL6420 delivers on high performance in a very small package that offers power, thermal and cost efficiencies that customers need. A key feature of this PWM Controller is its ability to accept an external reference input, thereby allowing multiple regulated power supply rails to track each other. Another key feature, voltage margining, allows downstream circuitry to be exercised within the full range of voltage tolerance that could occur over the life of the product and can be pre-set to a desired percentage variation to ensure simulation of worst-case conditions.
Simple single feedback loop voltage mode control of the ISL6420 provides fast transient response. The output voltage can be precisely regulated to as low as 0.6 V, with a maximum tolerance of +/-1.0% over temperature and line voltage variations. The switching frequency is fully adjustable from 100 kHz to 1.4 MHz providing a wide range of design discretion. The high frequency end of the range allows designers to realize space and cost savings because smaller and fewer passive filter components are needed.
The ISL6420 includes a high-performance error amplifier that features a 15-MHz gain bandwidth product (GBP) and a 6-V/us slew rate that enables high converter bandwidth for fast transient response and a cleaner DC output.
The PWM duty cycle is not limited and can cover the entire 0% to 100% range as needed. Soft start can be optimized as desired by selecting the capacitor value from the enable soft-start (EN/SS) pin to ground. Switching the EN/SS pin to ground disables the controller.
The ISL6420 monitors the output voltage and generates a power-good (PGOOD) signal when the soft-start sequence has completed and the output is within regulation. A built-in over-voltage protection circuit prevents the output voltage from going above typically 115% of the set point. Protection from over-current conditions is provided by making use of the RDS(ON) of the upper MOSFET, saving the cost of an external current-sense resistor.
ISL6420 Technical Summary
- 4.5 V to 16 V input supply range
- +/-1% accuracy over line and temperature from 0.6 V reference
- Voltage margining and external reference tracking modes for distributed supply synchronization
- Resistor selectable switching frequency over a 100-kHz to 1.4-MHz range
- Outputs can sink or source current
- Lossless and programmable over-current protection using upper MOSFETs RDS(ON)
- Programmable soft start
- Drives two economical N-channel MOSFETs
- Simple single-loop voltage-mode PWM control
- Fast transient response with 15-MHz GBP error amplifier
- Full 0% to 100% duty cycle
- Extensive circuit protection functions
- PGOOD, over-voltage, over-current, shutdown
- Near-chip-scale package
- 20-pad 4 X 4 mm QFN package improves board and thermal efficiencies
- Compliant to JEDEC PUB95 MO-220 QFN product outline
The ISL6420IR is available now. The suggested resale price in 100 to 999-unit quantities is $ $1.42 for each IC. ICs are available on tape and reel. About Intersil
Intersil Corporation is a leader in the design and manufacture of high performance analog semiconductors. The company’s products address three of the industry’s fastest growing markets - flat panel displays, optical storage (CD and DVD recordable) and power management. Intersil products include power management devices for battery management, hot-swap and hot-plug controllers, linear regulators, supervisory ICs, switching DC-DC regulators and power MOSFET drivers; optical storage laser diode drivers; DSL line drivers; video and high performance operational amplifiers; data converters; interface ICs; analog switches and multiplexers; crosspoint switches; voice-over-IP devices; and ICs for military, space and rad-hard applications. For more information about Intersil or to find out how to become a member of our winning team, visit the company’s web site and career page at: www.intersil.com.
This release may include "forward looking statements" that are subject to risks and uncertainties. For information identifying economic, political, climatic, currency, regulatory, technological, competitive and some other important factors that could cause actual results to differ materially from those anticipated in the forward looking statements, see Intersil’s Safe Harbor Forward Looking Statement disclaimer found at http://www.intersil.com/legal.asp, as well as Intersil’s SEC filings as updated from time to time, found at http://www.sec.gov. Endura is a trademark of Intersil Americas Inc.
All other trademarks mentioned are the property of their respective owners.
