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Numéro de sérieAT73C224
CategoriePower Management => Power Supply Controllers
DescriptionAnalog Companions (PMAAC)
he AT73C224 Analog Companion Power Management Unit supplies the required voltages and currents to the main sections of generic 32-bit MCU-based applications including MCU core, memory, I/O, USB host and interfaces. The AT73C224 outputs four power supply channels. One Step Down DC to DC converter supplies a 0.9V to 3.4V programmable output voltage, one Step Up DC to DC converter supplies 5.2V or higher output voltage, and two linear regulators (LDO) supply programmable output voltages from 1.3V to 3.3V. Additionally, a Real Time Clock (RTC) is integrated together with a very low current (1uA) crystal oscillator and backup battery management system.
SociétéATMEL Corporation
DatasheetTélécharger AT73C224 datasheet
 
 
  • Description courte
  • Features
    · DC/DC Step-up Converter (BOOST) to 90% Efficiency. Can be Used
    Efficiency, Pulse Skipping Capabilities for High Efficiency at Light Load Currents
    · 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 to 5.25V (typ: Li-Ion Battery to 4.2V) Available 32-pin 5x5 QFN Package Applications Include: ­ WLAN Portable Devices ­ Multimedia Devices ­ Portable Music Players

    Power Management and Analog Companions (PMAAC) AT73C224-H 4x Channels Power Supply: DC/DC BOOST DC/DC BUCK. 2x LDOs RTC

    The 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 to 5.25V voltage rail. It includes four power supplies and a very low power Realtime 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: BUCK2, LDO3 and LDO4. Table 1-1 lists the different devices available in the AT73C224-x series.

    For more details concerning the Automatic start-up sequences, see Section 5.2. For more details concerning the Management Modes, see Section 5.3. Table 1-1.

    BOOST1 can be activated after Start-up sequence by a user command.

    BOOST1 can be activated after Start-up sequence by a user command. BUCK2 can be activated after Start-up sequence by a user command. & LDO4 are supplied by BOOST1. (See Section 4. "Application examples", Figure 4-3 on page 7: Application Schematic 3.) Same as AT73C224-A.

    VDD3 VO3 GNDANA VOUT 2.5V-2.8V 3.3V ILOAD mA LDO4 VOUT 2.5V-2.8V 3.3V ILOAD 200 mA POR RTC LDO RTC OSC BUCK2 VOUT 0.9V-3.4V ILOAD VDD1 BOOST1 VOUT 3.3V-5.2V ILOAD 21 20

    VDDIO D3 D4 POK ITB Digital Interface (TWI / SPI) PMC Status Register
    POR, VMON (Voltage Monitor) LPVBG (Low power VBG)