ISL6406_07 Datasheet, PDF (1/18 Pages) Intersil Corporation – Single Synchronous Buck Pulse-Width Modulation (PWM) Controller

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Data Sheet
January 16, 2007
ISL6406
FN9073.7
Single Synchronous Buck Pulse-Width
Modulation (PWM) Controller
The ISL6406 is an adjustable frequency, synchronous buck
switching regulator optimized for generating lower voltages
for the distributed DC/DC architectures. The ISL6406 offers
an adjustable output voltage.
Designed to drive N-Channel MOSFETs in synchronous
buck topology, the ISL6406 integrates the control, output
adjustment and protection functions into a single package.
The ISL6406 provides simple, single feedback loop, voltage-
mode control with fast transient response. The output
voltage can be precisely regulated to as low as 0.8V. The
error amplifier features a 15MHz gain-bandwidth product
and 6V/μs slew rate which enables high converter bandwidth
for fast transient performance.
Protection from overcurrent conditions is provided by
monitoring the r_DS(ON) of the upper MOSFET to inhibit PWM
operation appropriately. This approach simplifies the
implementation and improves efficiency by eliminating the
need for a current sense resistor.
The wide programmable switching frequency range of
100kHz to 700kHz allows the use of small surface mount
inductors and capacitors. The device also provides external
frequency synchronization making it an ideal choice for
DC/DC converter applications.
Features
• Operates from 3.3V/5V Input
• 0.8V to V_IN Output Range
- 0.8V Internal Reference
- ±1.5% Reference Accuracy
• Simple Single-Loop Control Design
- Voltage-Mode PWM Control
• Fast Transient Response
- High-Bandwidth Error Amplifier
• Lossless, Programmable Overcurrent Protection
- Uses Upper MOSFET’s r_DS(on)
• Programmable Switching Frequency 100kHz to 700kHz
• External Frequency Synchronization
• Two Device Options Available
- ISL6406 . . . . . . . . . . . . . . . . Adjustable Output Voltage
• Internal Soft-Start
• QFN Package Option
- 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 Plus Anneal Available (RoHS Compliant)
- Designated with “Z” Suffix (Refer to Note)
Applications
• 3V/5V DC/DC Converter Modules
• Distributed DC/DC 3.3V, 2.5V and 1.8V Power
Architectures for DSP, Logic, and Memory
• Power Supplies for Microprocessors
- PCs
- Embedded Controllers
• Memory Supplies
• Personal Computer Peripherals
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CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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