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ISL6527, ISL6527A
Data Sheet
July 23, 2007
FN9056.9
Single Synchronous Buck Pulse-Width
Modulation (PWM) Controller
The ISL6527, ISL6527A make simple work out of
implementing a complete control and protection scheme for
a DC/DC stepdown converter. Designed to drive N-Channel
MOSFETs in a synchronous buck topology, the ISL6527,
ISL6527A integrate the control, output adjustment,
monitoring and protection functions into a single package.
The ISL6527, ISL6527A provide simple, single feedback loop,
voltage-mode control with fast transient response. The output
voltage can be regulated to as low as the provided external
reference. A fixed frequency oscillator reduces design
complexity, while balancing typical application cost and
efficiency.
The error amplifier features a 15MHz gain-bandwidth
product and 6V/μs slew rate which enables high converter
bandwidth for fast transient performance. The resulting
PWM duty cycles range from 0% to 100%.
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.
Features
• Operates from 3.3V to 5V input
• Utilizes an external reference
• 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
• Lossless, programmable overcurrent protection
- Uses upper MOSFET’s r
DS(ON)
• Converter can source and sink current
• Small converter size
- Internal fixed frequency oscillator
- ISL6527: 300kHz
- ISL6527A: 600kHz
- Internal soft-start
- 14 Ld SOIC or 16 Ld 5x5 QFN
• QFN package:
- Compliant to JEDEC PUB95 MO-220 QFN - Quad Flat
No Leads - Package Outline
- Near Chip Scale Package footprint, which improves
PCB efficiency and has a thinner profile
• Pb-free plus anneal available (RoHS compliant)
Applications
• Power supplies for microprocessors
- PCs
- Embedded controllers
• Subsystem power supplies
- PCI/AGP/GTL+ busses
- ACPI power control
- DDR SDRAM bus termination supply
• Cable modems, set top boxes, and DSL modems
• DSP and core communications processor supplies
• Memory supplies
• Personal computer peripherals
• Industrial power supplies
• 3.3V input DC/DC regulators
• Low voltage distributed power supplies
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774
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Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright Intersil Americas Inc. 2003-2007. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.
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