IC manufacturers Microchip

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Microchip AT73C224

Power Management and Analog Companions

Overview

TopologySEPIC Buck-Boost Topology
Input voltage3-4.2 V
Output 13.3 V / 1 A
IC revisionA

Description

The AT73C224-x is a family of ultra low cost Power Management Unit, available in asmall outline QFN 5x5mm package.The AT73C224-x family is optimized for portable applications, typically powered by aLi-Ion battery. The AT73C224-x device is also suitable to operate from a standard3.3V to 5.25V voltage rail. It includes four power supplies and a very low power RealtimeClock (RTC). In normal mode (main battery present), the backup battery isrecharged through a 2.6V RTC LDO.The AT73C224-x series offer different automatic start-up sequences (with varyingorders of power-on and specific default output values) and different soft managementmodes: dynamic (via SPI or TWI) with register access or static, with access to poweron/off of the four power supplies.Each AT73C224-x device is equipped with a very low power bandgap reference, lowpower 32 kHz and 1 MHz oscillators and an internal LDO used to generate the internalsupply (VINT) equal to 2.8V. Auxiliary cells, such as a power-on reset (POR) and avoltage monitor are used to control the system power-on (battery plugged in) andpower-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.

Features

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

Typical applications

  • Portable Music Players
  • Multimedia Devices
  • WLAN Portable Devices

Products

Order Code Data­sheet Simu­lation Downloads Status Product seriesL
(µH)
IR
(A)
ISAT
(A)
RDC max.
(Ω)
fres
(MHz)
Samples
744773022SPEC

PCN pending

Due to a pending PCN, a modification of the component will be implemented soon. Please find the PCN below. If you have further questions please get in contact with our sales staff.

8 files Active i| Production is active. Expected lifetime: >10 years.WE-PD2 SMT Power Inductor 2.2 2.5 3.38 0.071 85
744773068SPEC

PCN pending

Due to a pending PCN, a modification of the component will be implemented soon. Please find the PCN below. If you have further questions please get in contact with our sales staff.

8 files Active i| Production is active. Expected lifetime: >10 years.WE-PD2 SMT Power Inductor 6.8 1.54 2.1 0.131 41
Order Code Data­sheet Simu­lation
744773022SPEC

PCN pending

Due to a pending PCN, a modification of the component will be implemented soon. Please find the PCN below. If you have further questions please get in contact with our sales staff.

744773068SPEC

PCN pending

Due to a pending PCN, a modification of the component will be implemented soon. Please find the PCN below. If you have further questions please get in contact with our sales staff.

Samples
Order Code Data­sheet Simu­lation Downloads Status Product seriesL
(µH)
IR
(A)
ISAT
(A)
RDC max.
(Ω)
fres
(MHz)
Samples