AS1326A-BTDT-1K ams

austriamicrosystems AG is now ams AG The technical content of this austriamicrosystems datasheet is still valid. Contact information: Headquarters: ams AG Tobelbaderstrasse 30 8141 Unterpremstaetten, Austria Tel: +43 (0) 3136 500 0 e-Mail: ams_sales@ams.com Please visit our website at www.ams.com Datasheet AS1326 High Current, 0.8A DC-DC Step-Up Converters 1 General Description 2 Key Features ! Up to 800mA Output The AS1326A/AS1326B are high-efficiency, high cur- rent, DC-DC step-up converters specifically designed for ! Constant-Frequency (1MHz) Operation battery-powered wireless applications. Low quiescent supply current (65A), high operating frequency (1MHz), ! Up to 96% Efficiency and minimal external component requirements make these devices perfect for small hand-held applications. ! Input Range: 0.7 to 5.0V Table 1. Standard Products ! Fixed Output: 3.3V Model Input Signal Activation ! Adjustable Output: 2.5 to 5.0V AS1326A Logic-Low On ! PWM Synchronous-Rectified Technology AS1326B Logic-High On ! Logic-Controlled Shutdown: 0.1A Both devices use synchronous-rectified pulse-width modulation (PWM) boost technology to generate 2.5 to ! Synchronizable Switching Frequency 5.0V outputs from a wide range of inputs, such as 1 to 3 (0.5 to 1.2MHz) alkaline/NiCd/NiMH cells or a single lithium-ion (Li+) cell. Automatic powersave operation significantly ! Adjustable Current Limit improves efficiency at light-loads. ! Adjustable Soft-Start Continuous switching mode is available for applications requiring constant-frequency operation at all load cur- ! 10-pin TDFN (3.0mm x 3.0mm) Package rents. PWM operation can also be synchronized to an external clock to protect sensitive frequency bands in 3 Applications communications equipment. Analog soft-start and adjustable current limit permit opti- The devices are ideal for digital cordless phones. mobile mization of rush in current and external component size. phones, wireless handsets, hand-held instruments, PDAs, two-way pagers, and any battery-operated equip- The AS1326A/AS1326B are available in a 10-pin TDFN ment. (3.0mm x 3.0mm) package. Figure 1. AS1326 - Block Diagram 5 Undervoltage AS1326 + Lockout OUT IC Power 9 2.15V On Q 10 D POUT AS1326B Startup only ON Controller Osc 10 AS1326A 8 only ONN On Rdy En LX Reference 2 1.25V En Osc Osc Ref GND 1MHz Osc REF 7 CLK/SEL Mode Mode 3 PGND GND 6 FB ISET CLK/SEL 4 FB 1 ISET www.austriamicrosystems.com Revision 1.05 1 - 18 ams AG Technical content still valid