AS1332 austriamicrosystems AG, AS1332 Datasheet - Page 11

• Manufacturer Part Number: AS1332
• Description: 650mA Step-Down DC-DC Converter
• Manufacturer: austriamicrosystems AG

AS1332
Datasheet - D e t a i l e d D e s c r i p t i o n
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8 Detailed Description
For driving RF power amplifiers in portable devices and battery powered RF devices the AS1332 is a very suitable DC-
DC converter. The AS1332 features current overload protection, thermal overload shutdown and soft start. Besides
these features the device also displays the following characteristics:
Figure 30. AS1332 Block Diagram
AS1332 is fabricated using a 8-pin WL-CSP, which requires special design considerations for implementation. Its fine
bumppitch requires careful board design and precision assembly equipment. This package offers the smallest possible
size, for space-critical applications such as cell phones, where board area is an important design consideration. The
size of the external components is reduced by using a high switching frequency (2MHz). For implementation only three
external power components are required
opaque case applications, where its edges are not subject to high intensity ambient red or infrared light. Also the
system controller should set EN low during power-up and other low supply voltage conditions.
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depending on input voltage, output voltage and the selected inductor.
adjusting the voltage on the control pin without the need for external feedback resistors.
Current-mode buck architecture with synchronous rectification for high efficiency.
Operation at maximum efficiency over a wide range of power levels from a single Li-Ion battery cell.
The maximum load capability of 650mA is provided in PWM mode, wherein the maximum load range may vary
Efficiency is of around 96% for a 400mA load with 3.16V output and 3.6V input.
For longer battery life, the output voltage can be dynamically programmable from 1.3V (typ) to 3.16V (typ) by
13.
VCON
FB
EN
Logic and
Soft Start
Clamp
Oscillator
Main Control
Shutdown
Control
(see Figure 1 on page
Revision 1.01
1). The 8-pin WL-CSP package is appropriate for
Control
Mosfet
Logic
VDD
Current
Sense
AS1332
AGND
PVIN
See Shutdown Mode on
PGND
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