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AS1322B-BTTT Datasheet(PDF) 1 Page - ams AG |
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AS1322B-BTTT Datasheet(HTML) 1 Page - ams AG |
1 / 17 page AS1322 Low Vo ltage, Micropower, DC-DC Step-Up Converters Dat a Sh eet www.austriamicrosystems.com Revision 1.07 1 - 17 1 General Description The AS1322A and the AS1322B are synchronous, fixed frequency, very high-efficiency DC-DC boost converters capable of supplying 3.3V at 150mA from a single AA- supply. Compact size and minimum external parts requirements make these devices perfect for modern portable devices. High-speed switching frequency (1.2MHz) and internally compensated PWM current mode design provide highly- reliable DC-DC conversion, especially when driving white LEDs. The converters are available as the standard products listed in Table 1. The devices contain two internal MOSFET switches: one NMOS switch and one PMOS synchronous rectifier. Anti-ringing control circuitry reduces EMI by damping the inductor in discontinuous mode, and the devices exhibit extremely low quiescent current (< 1µA) in shut- down. In shutdown mode the battery is connected to the output and VOUT is held at approximately VIN - 0.6V. The AS1322 is available in a 6-pin TSOT-23 package. 2 Key Features ! 95% Efficiency ! Single-Cell Operation ! Delivers 160mA @ 3.3V (from Single AA Cell) ! Delivers 220mA @ 5.0V (from Two AA Cells) ! Delivers 570mA @ 3.3V (from Two AA Cells) ! Low Start-Up Voltage: 0.85V ! High-Speed Fixed-Frequency: 1.2MHz ! Internal PMOS Synchronous Rectifier ! Automatic Powersave Operation (AS1322A) ! Continuous Switching at Light Loads (AS1322B) ! Anti-Ringing Control Minimizes EMI ! Logic Controlled Shutdown (< 1µA) ! Output Range: 2.5 to 5.0V ! 6-pin TSOT-23 Package 3 Applications The AS1322 is ideal for low-power applications where ultra-small size is critical as in medical diagnostic equip- ment, hand-held instruments, pagers, digital cameras, remote wireless transmitters, MP3 players, LCD bias supplies, cordless phones, GPS receivers, and PC cards. Table 1. Standard Products Model Light Load Switching AS1322A Automatic Powersave Operation AS1322B Continuous Switching AA Battery AS1322 C2 10µF R2 604k Ω 1% R1 1.02M Ω 1% On Off L1 4.7µH C1 10µF GND 2 SW 1 VOUT 3.3V 160mA 4 SHDNN 3 FB 6 VIN 5 VOUT Figure 1. Typical Application Diagram – Single Cell to 3.3V Synchronous Boost Converter |
Similar Part No. - AS1322B-BTTT |
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Similar Description - AS1322B-BTTT |
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