zl2106 Intersil Corporation, zl2106 Datasheet - Page 11

• Manufacturer Part Number: zl2106
• Description: 6a Digital-dc Synchronous Step-down Dc-dc Converter
• Manufacturer: Intersil Corporation

5. ZL2106 Overview
5.1 Digital-DC Architecture
The ZL2106 is an innovative mixed-signal power
conversion and power management IC based on Zilker
Labs patented Digital-DC technology that provides an
integrated, high performance step-down converter for
point of load applications. The ZL2106 integrates all
necessary PWM control circuitry as well as low R
synchronous power MOSFETs to provide an extremely
small solution for supplying load currents up to 6 A.
Its unique PWM loop utilizes an ideal mix of analog
and digital blocks to enable precise control of the entire
power conversion process with no software required,
resulting in a very flexible device that is also very easy
to use. An extensive set of power management
functions are fully integrated and can be configured
using simple pin connections. The user configuration
can be saved in an internal non-volatile memory
(NVM). Additionally, all functions can be configured
and monitored via the SMBus hardware interface using
standard
flexibility.
Once enabled, the ZL2106 is immediately ready to
regulate power and perform power management tasks
with
configuration options and real-time configuration
changes are available via the I
desired and continuous monitoring of multiple
operating parameters is possible with minimal
interaction from a host controller. Integrated sub-
regulation circuitry enables single supply operation
from any external supply between 4.5 V and 14 V with
no secondary bias supplies needed. The ZL2106 can
also be configured to operate from a 3.3 V or 5 V
standby supply when the main power rail is not
present, allowing the user to configure and/or read
diagnostic information from the device when the main
power has been interrupted or is disabled.
The ZL2106 can be configured by simply connecting
its pins according to the tables provided in the
following sections. Additionally, a comprehensive set
of application notes are available to help simplify the
design process. An evaluation board is also available to
help the user become familiar with the device. This
board can be evaluated as a standalone platform using
pin configuration settings. A Windows™-based GUI is
also provided to enable full configuration and
no
PMBus
programming
11
commands,
required.
2
C/SMBus interface if
allowing
Advanced
ultimate
DS(ON)
ZL2106
monitoring capability via the I
using an available computer and the included USB
cable.
Application notes and reference designs are available
to assist the user in designing to specific application
demands.
www.zilkerlabs.com
documentation or call your local Zilker Labs sales
representative to order an evaluation kit.
5.2 Power Conversion Overview
The ZL2106 operates as a voltage-mode, synchronous
buck converter with a selectable constant frequency
pulse width modulator (PWM) control scheme. The
ZL2106 integrates dual low R
MOSFETs to minimize the circuit footprint.
Figure 9 illustrates the basic synchronous buck
converter topology showing the primary power train
components. This converter is also called a step-down
converter, as the output voltage must always be lower
than the input voltage.
Figure 9. Synchronous Buck Converter
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Data Sheet Revision 2/19/2009
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