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AS1334-BTDT-12 Datasheet(PDF) 11 Page - ams AG |
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AS1334-BTDT-12 Datasheet(HTML) 11 Page - ams AG |
11 / 19 page www.austriamicrosystems.com/DC-DC_Step-Down/AS1334 Revision 1.09 10 - 18 AS1334 Datasheet - Detailed Descr i pti on 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. Is ranked at an efficiency of around 96% for a 400mA load with a 3.6V input voltage. Figure 22. AS1334 - Functional Block Diagram 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. Mosfet Control Logic Shutdown Control Main Control Soft Start Oscillator Current Sense PVIN VDD FB EN SW SGND PGND AS1334 POK + – 1.13V |
Similar Part No. - AS1334-BTDT-12 |
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Similar Description - AS1334-BTDT-12 |
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