ISL8121 PDF Datasheet ( 特性, スペック, ピン接続図 )

部品番号 ISL8121
部品説明 Two-Phase Buck PWM Controller
メーカ Intersil Corporation
ロゴ Intersil Corporation ロゴ 

Total 26 pages

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ISL8121 Datasheet, ISL8121 PDF,ピン配置, 機能
Data Sheet
October 18, 2006
3V to 20V, Two-Phase Buck PWM
Controller with Integrated 4A MOSFET
The ISL8121 is a two-phase buck PWM controller featuring
an input voltage range of 3V to 20V and integrated MOSFET
drivers. Precision voltage regulation is provided for
point-of-load and other high-current applications that require
efficient and compact implementation. Multiphase buck
converter architecture uses interleaved timing to multiply
channel ripple frequency allowing smaller filter inductors and
reducing input and output ripple currents due to the ripple
cancellation effect. Lower ripple results in fewer input and
output capacitors. Smaller and low cost transistors can be
used resulting from the higher efficiency and reduced power
The ISL8121 offers an internal 0.6V reference with a system
regulation accuracy of ±0.8% (Industrial Temperature
range), an optional external reference input, and
user-adjustable switching frequency. Unity gain differential
amplifier targeted at remote voltage sensing capability
enhances the regulation. A power good signal (PGD) is
issued when the output voltage is within the regulated
window. An internal shunt regulator with optional external
connection capability extends the operational input voltage
range. For applications requiring voltage tracking or
sequencing, the ISL8121 offers a host of possibilities,
including coincidental, ratiometric, or offset tracking, as well
as sequential start-ups, user adjustable for a wide range of
Additional features include overvoltage and overcurrent
protection. Overcurrent protection can be tailored to various
applications with no need for additional parts. The ISL8121
uses cost and space-saving rDS(ON) sensing for channel
current balance, dynamic voltage positioning, and
overcurrent protection. Channel current balancing is
automatic and accurate with the integrated current-balance
control system.
• Integrated Two-Phase Power Conversion
• Precision Output Voltage Regulation
- ±0.8% System Accuracy Over Temperature (Industrial)
- Differential Remote Voltage Sensing for Increased
Voltage Sensing Accuracy
• Shunt Regulator for Wide Input Power Conversion
- 5V and Higher Bias
- Up to 20V Power Down-Conversion
• Precision Channel Current Sharing
- Loss-Less rDS(ON) Current Sampling
• Integrated High Capable 4A Drivers
• 0.6V Internal Reference
• Full Spectrum Voltage Tracking
- Coincidental, Ratiometric, or Offset
• Sequential Start-up Control
• Selectable Switching Frequency up to 2MHz Per Phase
• Fast Transient Recovery Time
• Overcurrent Protection
• Overvoltage Protection
• Capable of Start-up in a Pre-Biased Load
• QFN Packages:
- QFN - 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)
• General Purpose High Current DC/DC Converters
• High Current, Low Voltage FPGA/ASIC DC/DC
• Telecom System
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 | Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright © Intersil Americas Inc. 2006. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.

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