ZL2103ALAF datasheet(10/28 Pages) RENESAS

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ZL2103

FN6966 Rev 5.00

Page 10 of 28

May 3, 2011

ZL2103 Overview

Digital-DC Architecture

The ZL2103 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 ZL2103

integrates all necessary PWM control circuitry as well as low

rDS(ON) synchronous power MOSFETs to provide an extremely

small solution for supplying load currents up to 3A.

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 PMBus

commands, allowing ultimate flexibility.

Once enabled, the ZL2103 is immediately ready to regulate

power and perform power management tasks with no

programming required. Advanced configuration options and real-

time configuration changes are available via the I2C/SMBus

interface if 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 4.5V and 14V

with no secondary bias supplies needed. The ZL2103 can also be

configured to operate from a 3.3V or 5V 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 ZL2103 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 monitoring capability

via the I2C/SMBus interface using an available computer and the

included USB cable.

Power Conversion Overview

The ZL2103 operates as a voltage-mode, synchronous buck

converter with a selectable constant frequency pulse width

modulator (PWM) control scheme. The ZL2103 integrates dual

low rDS(ON) synchronous 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.

VIN

VOUT

COUT

CIN

PWM

LDO

FIGURE 9. SYNCHRONOUS BUCK CONVERTER

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