AT73C224-B_14 datasheet, PDF - EEWORLD Datasheet

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AT73C224-B_14: DescriptionUltra-low Power Real-time Clock (RTC) and Backup Battery Management; File Size853KB，75 Pages; ManufacturerAtmel (Microchip)

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AT73C224-B_14 Overview

Ultra-low Power Real-time Clock (RTC) and Backup Battery Management

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Features

•

DC/DC Step-up Converter (BOOST) 3.3V to 5.2V, 1A, up to 90% Efficiency. Can be Used

•

as BUCK/BOOST in SEPIC Configuration

DC/DC Step-down (BUCK) Synchronous Converter 0.9V to 3.4V, 500mA, up to 90%

Efficiency, Pulse Skipping Capabilities for High Efficiency at Light Load Currents

Two Low-Drop-Out Regulators 1.3V, 1.5V to 1.8V, 2.5V to 2.8V (100 mV Step), 3.3V,

200 mA Maximum Load

Ultra-low Power Real-time Clock (RTC) and Backup Battery Management

– 2.6V RTC LDO for Backup Battery Charging

– 32 kHz Crystal RTC Oscillator (1 µA)

– RTC Circuit for Time and Date Information

Activation of the Power Management Modules via Dedicated Enable Pin

Automatic Start-up Sequences, POK Signal Indicating When Start-up is Completed

Activation and Control of the Power Management Modules in Dynamic Mode (via SPI or

TWI) or in Static Mode (On/Off of the Four Power Supplies)

ITB Signal Indicating Short-circuits in DC/DC Converters

Very Low Quiescent Current

Minimum External Components Count

Supply: from 2.8V to 5.25V (typ: Li-Ion Battery 3V to 4.2V)

Available in a 32-pin 5x5 QFN Package

Applications Include:

– WLAN Portable Devices

– Multimedia Devices

– Portable Music Players

•

Power

Management

and Analog

Companions

(PMAAC)

AT73C224-A

AT73C224-B

AT73C224-C

AT73C224-D

AT73C224-E

AT73C224-F

AT73C224-G

AT73C224-H

4x Channels

Power Supply:

DC/DC BOOST

DC/DC BUCK

2x LDOs

RTC

6266A–PMAAC–08-Sep-08

1. Description

The AT73C224-x is a family of ultra low cost Power Management Unit, available in a

small outline QFN 5x5mm package.

The AT73C224-x family is optimized for portable applications, typically powered by a

Li-Ion battery. The AT73C224-x device is also suitable to operate from a standard

3.3V to 5.25V voltage rail. It includes four power supplies and a very low power Real-

time Clock (RTC). In normal mode (main battery present), the backup battery is

recharged through a 2.6V RTC LDO.

The AT73C224-x series offer different automatic start-up sequences (with varying

orders of power-on and specific default output values) and different soft management

modes: dynamic (via SPI or TWI) with register access or static, with access to power

on/off of the four power supplies.

Each AT73C224-x device is equipped with a very low power bandgap reference, low

power 32 kHz and 1 MHz oscillators and an internal LDO used to generate the internal

supply (VINT) equal to 2.8V. Auxiliary cells, such as a power-on reset (POR) and a

voltage monitor are used to control the system power-on (battery plugged in) and

power-off (battery unplugged).

The four power supplies are named: BOOST1, BUCK2, LDO3 and LDO4.

Table 1-1

lists the different devices available in the AT73C224-x series.

AT73C224-B_14 Related Products

	AT73C224-B_14	AT73C224-A_14	AT73C224-D_14	AT73C224-E_14	AT73C224-G_14	AT73C224-C_14	AT73C224-H_14
Description	Ultra-low Power Real-time Clock (RTC) and Backup Battery Management	Ultra-low Power Real-time Clock (RTC) and Backup Battery Management	Ultra-low Power Real-time Clock (RTC) and Backup Battery Management	Activation of the Power Management Modules via Dedicated Enable Pin	Ultra-low Power Real-time Clock (RTC) and Backup Battery Management	Ultra-low Power Real-time Clock (RTC) and Backup Battery Management	Ultra-low Power Real-time Clock (RTC) and Backup Battery Management

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