AS1334-BTDT-15 Ver la hoja de datos (PDF) - austriamicrosystems AG
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AS1334-BTDT-15 Datasheet PDF : 19 Pages
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AS1334
Datasheet - Detailed Description
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:
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 battery cell.
Provides for a maximum load capability of 650mA in PWM mode, wherein the maximum load range may vary depending on input voltage,
output voltage and the selected inductor.
lid Is ranked at an efficiency of around 96% for a 400mA load with a 3.6V input voltage.
Figure 22. AS1334 - Functional Block Diagram
G still va 1.13V –
+
POK
Oscillator
s A nt FB
am nte SoftStart
co Main Control
l EN
Shutdown
TechnicaControl
VDD
Current
Sense
Mosfet
Control
Logic
PVIN
SW
AS1334
SGND
PGND
The size of the external components is reduced by using a high switching frequency (2MHz). Figure 1 on page 1 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. See Shutdown Mode on page 12.
www.austriamicrosystems.com/DC-DC_Step-Down/AS1334
Revision 1.09
10 - 18
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