ISL6567_07 Datasheet, PDF (1/26 Pages) Intersil Corporation – Multipurpose Two-Phase Buck PWM Controller with Integrated MOSFET Drivers

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Data Sheet
March 20, 2007
ISL6567
FN9243.2
Multipurpose Two-Phase Buck PWM
Controller with Integrated MOSFET
Drivers
The ISL6567 two-phase synchronous buck PWM control IC
provides a precision voltage regulation system for point-of-
load and other high-current applications requiring an efficient
and compact implementation. Multi-phase power conversion
is a marked departure from single phase converter
configurations employed to satisfy the increasing current
demands of various electronic circuits. By distributing the
power and load current, implementation of multi-phase
converters utilize smaller and lower cost transistors with
fewer input and output capacitors. These reductions accrue
from the higher effective conversion frequency with higher
frequency ripple current resulting from the phase
interleaving inherent to this topology.
Outstanding features of this controller IC include an internal
0.6V reference with a system regulation accuracy of ±1%, an
optional external reference input, and user-adjustable
switching frequency. Precision regulation is further
enhanced by the available unity-gain differential amplifier
targeted at remote voltage sensing capability, while output
regulation is monitored and its quality is reported via a
PGOOD pin. Also included, an internal shunt regulator with
optional external connection capability extends the
operational input voltage range. For applications requiring
voltage tracking or sequencing, the ISL6567 offers a host of
possibilities, including coincidental, ratiometric, or offset
tracking, as well as sequential start-ups, user adjustable for
a wide range of applications.
Protection features of this controller IC include overvoltage
and overcurrent protection. Overvoltage results in the
converter turning the lower MOSFETs ON to clamp the rising
output voltage. The ISL6567 uses cost and space-saving
r_DS(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. Overcurrent
protection can be tailored to various application with no need
for additional parts.
Features
• Integrated Two-Phase Power Conversion
- Integrated 4A Drivers for High Efficiency
• Shunt Regulator for Wide Input Power Conversion
- 5V and Higher Bias
- Up to 20V Power Down-Conversion
• Precision Channel Current Sharing
- Loss-Less Current Sampling - Uses r_DS(ON)
• Precision Output Voltage Regulation
- ±0.6% System Accuracy Over Temperature
(Commercial Range)
• 0.6V Internal Reference
• Full Spectrum Voltage Tracking
- Coincidental, Ratiometric, or Offset
• Sequential Start-up Control
• Adjustable Switching Frequency
- 150kHz to 1.5MHz
• Fast Transient Recovery Time
• Unity-Gain Differential Amplifier
- Increased Voltage Sensing Accuracy
• Overcurrent Protection
• Overvoltage Protection
• Start-up into Pre-Charged Output
• Small, QFN Package Footprint
• Pb-Free Plus Anneal Available (RoHS Compliant)
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CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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