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ISL6527A Datasheet

  • ISL6527A

  • Single Synchronous Buck Pulse-Width Modulation (PWM) Control...

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ISL6527
Data Sheet
July 2003
FN9056.4
Single Synchronous Buck Pulse-Width
Modulation (PWM) Controller
The ISL6527 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 ISL6527
integrates the control, output adjustment, monitoring and
protection functions into a single package.
The ISL6527 provides 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/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?Utilizes an external reference
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
- ISL6527: 300kHz
- ISL6527A: 600kHz
- Internal soft-start
- 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
Ordering Information
TEMP
PART NUMBER RANGE (
o
C)
ISL6527CB
ISL6527ACB
ISL6527CR
ISL6527ACR
ISL6527IB
ISL6527AIB
ISL6527IR
ISL6527AIR
ISL6527EVAL1
ISL6527EVAL2
0 to 70
0 to 70
0 to 70
0 to 70
-40 to 85
-40 to 85
-40 to 85
-40 to 85
PACKAGE
14 Lead SOIC
14 Lead SOIC
PKG DWG. #
M14.15
M14.15
Applications
鈥?Power supplies for microprocessors
- PCs
- Embedded controllers
鈥?Subsystem power supplies
- PCI/AGP/GTL+ busses
- 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
16 Lead 5x5 QFN L16.5x5B
16 Lead 5x5 QFN L16.5x5B
14 Lead SOIC
14 Lead SOIC
M14.15
M14.15
16 Lead 5x5 QFN L16.5x5B
16 Lead 5x5 QFN L16.5x5B
ISL6527 SOIC Evaluation Board
ISL6527 QFN Evaluation Board
ISL6527AEVAL2 ISL6527A SOIC Evaluation Board
ISL6527AEVAL2 ISL6527A QFN Evaluation Board
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 321-724-7143
|
Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright 漏 Intersil Americas Inc. 2003. All Rights Reserved.
All other trademarks mentioned are the property of their respective owners.

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