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Atmel Electronic Components Datasheet

AT73C224-D Datasheet

Power Management and Analog Companions

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Features
DCw/DwCw.SDtaetapS-uhepeCt4oUn.cvoemrter (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
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.
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


Atmel Electronic Components Datasheet

AT73C224-D Datasheet

Power Management and Analog Companions

No Preview Available !

For more details concerning the Automatic start-up sequences, see Section 5.2.
For mwowrwe.DdaetataSihlseect4oUn.ccoemrning the Management Modes, see Section 5.3.
.
Table 1-1. AT73C224-x device series
Part Number Automatic Start-up Sequence
Management Mode Comments
Order of power-on and output default values.
AT73C224-A
1 - BUCK2= 1.8V
2 - LDO4 = 2.8V
3 - LDO3 = 2.7V
Dynamic
BOOST1 can be activated after Start-up
sequence by a user command.
AT73C224-B
1 - BUCK2 = 1.2V
2 - LDO4 = 1.8V
3 - LDO3 = 1.8V
Dynamic
BOOST1 can be activated after Start-up
sequence by a user command.
AT73C224-C
1 - LDO4 = 2.8V
2 - BUCK2 = 1.8V
3 - LDO3 = 2.7V
Dynamic
BOOST1 can be activated after Start-up
sequence by a user command.
AT73C224-D
1 - LDO4 = 1.8V
2 - BUCK2 = 1.2V
3 - LDO3 = 1.8V
Dynamic
BOOST1 can be activated after Start-up
sequence by a user command.
AT73C224-E
1 - BOOST11 = 5.2V
2 - LDO4 = 3.3V
3 - LDO3 = 3V
Dynamic
BUCK2 can be activated after Start-up
sequence by a user command.
LDO3 & LDO4 are supplied by BOOST1.
(See Section 4. “Application examples”, Figure
4-3 on page 7: Application Schematic 3.)
AT73C224-F
1 - BUCK2 = 1.8V
2 - LDO4 = 2.8V
3 - LDO3 = 2.7V
Static
Same as AT73C224-A.
AT73C224-G
1 - LDO4 = 2.8V
2 - BUCK2= 1.8V
3- LDO3 = 2.7V
Static
Same as AT73C224-C.
AT73C224-H
1 - BOOST1 = 5.2V
2 - LDO4 = 3.3V
3 - LDO3 = 3V
Static
Same as AT73C224-E.
2 AT73C224
6266A–PMAAC–08-Sep-08


Part Number AT73C224-D
Description Power Management and Analog Companions
Maker ATMEL
Total Page 30 Pages
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