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ISL6526
Data Sheet
August 2004
FN9055.5
Single Synchronous Buck Pulse-Width
Modulation (PWM) Controller
The ISL6526 makes 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 ISL6526
integrates the control, output adjustment, monitoring and
protection functions into a single package.
The ISL6526 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, with a
maximum tolerance of 卤1.5% over temperature and line
voltage variations. 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/碌s 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
鈥?Operates from 3.3V to 5V Input
鈥?0.8V to V
IN
Output Range
- 0.8V Internal Reference
- 卤1.5% Over Load, Line Voltage and Temperature
鈥?Drives N-Channel MOSFETs
鈥?Simple Single-Loop Control Design
- Voltage-Mode PWM Control
鈥?Fast Transient Response
- High-Bandwidth Error Amplifier
- Full 0% to 100% Duty Cycle
鈥?Lossless, Programmable Overcurrent Protection
- Uses Upper MOSFET鈥檚 r
DS(on)
鈥?Converter can Source and Sink Current
鈥?Small Converter Size
- Internal Fixed Frequency Oscillator
- ISL6526: 300kHz
- ISL6526A: 600kHz
鈥?Internal Soft-Start
鈥?14 Lead SOIC or 16 Lead, 5x5 QFN
鈥?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
鈥?Pb-free Available
Applications
鈥?Power Supplies for Microprocessors
- PCs
- Embedded Controllers
鈥?Subsystem Power Supplies
- PCI/AGP/GTL+ Buses
- ACPI Power Control
- DDR SDRAM Bus Termination Supply
鈥?Cable Modems, Set Top Boxes, and DSL Modems
鈥?DSP and Core Communications Processor Supplies
鈥?Memory Supplies
鈥?Personal Computer Peripherals
鈥?Industrial Power Supplies
鈥?3.3V-Input DC-DC Regulators
鈥?Low-Voltage Distributed Power Supplies
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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