ZL8802 datasheet(11/91 Pages) RENESAS

11 / 91 page

ZL8802

FN8760 Rev.3.00

Page 11 of 91

Nov 8, 2017

ZL8802 Overview

Digital-DC Architecture Overview

The ZL8802 is an innovative mixed-signal power conversion and

power management IC based on Intersil’s patented Digital-DC

technology that provides an integrated, high performance

step-down converter for a wide variety of power supply

applications.

The ZL8802 DC/DC controller is a dual channel, dual phase

controller based on an architecture that does not require loop

compensation.

The ZL8802’s full digital loop achieves 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. The

ChargeMode control algorithm is implemented to respond to

output current changes within a single PWM switching cycle. This

achieves a smaller total output voltage variation with less output

capacitance than traditional PWM controllers. 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 Nonvolatile Memory (NVRAM).

Additionally, all functions can be configured and monitored

through the SMBus hardware interface using standard PMBus

commands, allowing ultimate flexibility. The ZL8802 is compliant

with the PMBus Power System Management Protocol

Specification Part I and II version 1.2.

When enabled, the ZL8802 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 through PMBus

commands if desired and continuous monitoring of multiple

operating parameters is possible with minimal interaction from a

host controller. Integrated subregulation circuitry enables single

supply operation from any supply between 4.5V and 14V with no

bias supplies needed.

The ZL8802 can be configured by simply connecting its pins

according to the tables provided in the following sections.

Additionally, a comprehensive set of online tools and 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.

PowerNavigator™, a Windows based GUI, is also provided to

enable full configuration and monitoring capability through the

PMBus interface and the included USB cable.

Power Management Overview

The ZL8802 incorporates a wide range of configurable power

management features that are simple to implement with no

external components. Additionally, the ZL8802 includes circuit

protection features that continuously safeguard the device and

load from damage due to unexpected system faults. The ZL8802

can continuously monitor input voltage and current, output

voltage and current, internal temperature, and the temperature

of two external thermal diodes. A Power-Good output signal is

also included to enable power-on reset functionality for an

external processor.

All power management functions can be configured using either

pin configuration techniques described in this document or

through the SMBus interface using PMBus commands.

Monitoring parameters can also be preconfigured to provide

alerts for specific conditions. The “PMBus Command Summary”

on page 22 contains a listing of all the PMBus commands

supported by the ZL8802 and a detailed description of the use of

each of these commands.

Pin-Strap Pins

To simplify circuit design, the ZL8802 incorporates patented

pin-strap pins that allow the user to easily configure many

aspects of the device with no programming. Most power

management features can be configured using these pins. The

pin-strap pins will read the value of the resistor connected to

those pins when power is applied to the device and set certain

device configuration settings as specified by those resistor

values.

Device configuration settings are made when connecting a finite

value resistor (in a specified range) between the pin-strap pin and

SGND. Standard 1% resistor values are used, and only every

fourth E96 resistor value is used so the device can reliably

recognize the value of resistance connected to the pin while

eliminating the error associated with the resistor accuracy. Up to

31 unique selections are available using a single resistor.

SMBus: Almost any ZL8802 function can be configured through

the SMBus interface using standard PMBus commands.

Additionally, any value that has been configured using the

pin-strap setting method can also be reconfigured and/or verified

through SMBus. “PMBus Command Detail” on page 27 explains

the use of the PMBus commands in detail.

TABLE 2.

PIN TIED TO

VALUE

LOW (Logic LOW)

<0.8 VDC

OPEN (N/C)

No connection

HIGH (Logic HIGH)

>2.0 VDC

Resistor to SGND

Set by resistor value

MULTIMODE

PIN-STRAP

SETTINGS

RESISTOR

SETTINGS

MULTIMODE

LOGIC

HIGH

OPEN

LOGIC

LOW

V25

FIGURE 3. PIN-STRAP AND RESISTOR SETTINGS

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