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AS1322

ams
Part Number AS1322
Manufacturer ams
Description DC-DC Step-Up Converters
Published Feb 18, 2015
Detailed Description AS1322 Low Voltage, Micropower, DC-DC Step-Up Converters 1 General Description The AS1322A and the AS1322B are synchro...
Datasheet PDF File AS1322 PDF File

AS1322
AS1322

Overview
AS1322 Low Voltage, Micropower, DC-DC Step-Up Converters 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 DCDC conversion, especially when driving white LEDs.
The converters are available as the standard products listed in Table 1.
Table 1.
Standard Products Model Light Load Switching AS1322A Automatic Powersave Operation AS1322B Continuous Switching 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 shutdown.
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.
Figure 1.
Typical Application Diagram – Single Cell to 3.
3V Synchronous Boost Converter 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 equipment, hand-held instruments, pagers, digital cameras, remote wireless transmitters, MP3 players, LCD bias supplies, cordless phones, GPS receivers, and ...


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