1
FN9073.9
ISL6406
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
• 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 (RoHS compliant)
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
Ordering Information
PART NUMBER
(Note) PART MARKING TEMP. RANGE (°C)
PACKAGE
(RoHS Compliant) PKG. DWG. #
ISL6406IBZ* (No longer available,
recommended replacement: ISL6406IVZ)
6406IBZ -40 to +85 16 Ld SOIC M16.15
ISL6406IRZ* (No longer available or
supported)
ISL6406 IRZ -40 to +85 16 Ld 5x5 QFN L16.5x5B
ISL6406IVZ* 6406 IVZ -40 to +85 16 Ld TSSOP M16.173
*Add “-T” suffix to part number for tape and reel packaging. Please refer to TB347 for details on reel specifications.
NOTE: These Intersil Pb-free plastic packaged products employ special Pb-free material sets, molding compounds/die attach materials, and 100%
matte tin plate plus anneal (e3 termination finish, which is RoHS compliant and compatible with both SnPb and Pb-free soldering operations). Intersil
Pb-free products are MSL classified at Pb-free peak reflow temperatures that meet or exceed the Pb-free requirements of IPC/JEDEC J STD-020.
Data Sheet October 21, 2015
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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