AS1334 austriamicrosystems AG, AS1334 Datasheet - Page 10

• Manufacturer Part Number: AS1334
• Description: 650mA Ultra low Ripple Step Down DC/DC Converter
• Manufacturer: austriamicrosystems AG

AS1334
Datasheet - D e t a i l e d D e s c r i p t i o n
8 Detailed Description
The AS1334 is a simple, step-down DC-DC converter optimized for powering portable applications that require low
dropout voltages such as mobile phones, portable communicators, and similar battery powered RFID devices. Besides
being packed with numerous features like current overload protection, thermal overload shutdown and soft start,
AS1334 displays the following characteristics:
Figure 22. AS1334 - Functional Block Diagram
The size of the external components is reduced by using a high switching frequency (2MHz).
demonstrates that only three external power components are required for implementation. Also, the system controller
should set EN low during power-up and other low supply voltage conditions.
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tery cell.
depending on input voltage, output voltage and the selected inductor.
Its operation is based on current-mode buck architecture with synchronous rectification for high efficiency.
Allows the application to operate at maximum efficiency over a wide range of power levels from a single Li-Ion bat-
Provides for a maximum load capability of 650mA in PWM mode, wherein the maximum load range may vary
Is ranked at an efficiency of around 96% for a 400mA load with a 3.6V input voltage.
EN
FB
1.13V
Soft Start
–
+
Main Control
Shutdown
Control
POK
Oscillator
Revision 1.04
Control
Mosfet
Logic
VDD
Current
Sense
See Shutdown Mode on page
AS1334
SGND
Figure 1 on page 1
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PGND
PVIN
SW
12.
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