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AS1335 Datasheet(PDF) 2 Page - ams AG |
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AS1335 Datasheet(HTML) 2 Page - ams AG |
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2 / 19 page  AS1335 1.5A, 1.5MHz, Synchronous DC/DC Step-Down Converter www.austriamicrosystems.com/DC-DC_Step-Down/AS1335 Revision 1.03 1 - 18 Data sheet 1 General Description The AS1335 is a high-efficiency, constant-frequency synchronous buck converter available in a fixed or an adjustable output voltage version. The wide input volt- age range (2.6V to 5.25V), the high output current (up to 1.5A) and minimal external component requirements make the AS1335 perfect for any single Li-Ion battery- powered application. Typical supply current with no load is 400µA and decreases to ≤1µA in shutdown mode. The highly effi- cient duty cycle (100%) provides low dropout operation, prolonging battery life in portable systems. The device also offers a power-ok signal with a 215ms delay, which can be reseted or delayed further via the RSI pin. An internal synchronous switch increases efficiency and eliminates the need for an external Schottky diode. The internally fixed switching frequency (1.5MHz) allows for the use of small surface mount external components. The AS1335 is available in a 10-pin TDFN 3x3mm pack- age. Figure 1. AS1335 - Typical Application Diagram 2 Key Features ! High Efficiency: Up to 96% ! Output Current: 1.5A ! Input Voltage Range: 2.6V to 5.25V ! Output Voltage Range: 0.6V to VIN ! Constant Frequency Operation: 1.5MHz ! No Schottky Diode Required ! Power OK with 215ms delay ! Low Dropout Operation: 100% Duty Cycle ! Low Quiescent Supply Current: 400µA ! Shutdown Mode Supply Current: ≤1µA ! Current Mode Operation for Excellent Line/Load Transient Response ! Thermal Protection ! 10-pin TDFN 3x3mm Package 3 Applications The device is ideal for mobile communication devices, laptops and PDAs, ultra-low-power systems, threshold detectors/discriminators, telemetry and remote systems, medical instruments, or any other space-limited applica- tion with low power-consumption requirements. AS1335 COUT 22µF CIN 22µF VIN 2.6V to 5.25V VOUT 1.0V, 1.5A 2.2µH NC GND VIN SW POK FB EN GND PGND RSI |
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