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AS1326 Datasheet(PDF) 2 Page - ams AG |
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AS1326 Datasheet(HTML) 2 Page - ams AG |
2 / 18 page www.austriamicrosystems.com Revision 1.02 2 - 18 AS1326 Data Sheet - P i n o u t 4 Pinout Pin Assignments Figure 2. Pin Assignments (Top View) Pin Descriptions Table 2. Pin Descriptions Pin Number Pin Name Description 1 ISET N-Channel Current-Limit Control. For maximum current limit, connect to pin REF. To reduce current, supply a voltage between pin REF and GND using a resistive voltage-divider. If soft-start is desired, connect a capacitor from this pin to GND. 2REF 1.250V Internal Reference Bypass. Connect a 10nF ceramic bypass capacitor to GND. Up to 50µA of external load current is allowed. 3GND Ground. Connect this pin to PGND using a short trace. The exposed pad can be used for this routing. 4FB DC-DC Converter Feedback Input. To set fixed output voltage of +3.3V, connect this pin to GND. For adjustable output of 2.5 to 5.0V, connect to a resistor-divider network from pin OUT to GND. The set point for this pin is 1.24V. 5OUT IC Power, Supplied from the Output. Bypass this pin to GND with a 330nF ceramic capacitor, and connect to POUT with a 10 Ω series resistor (see Figure 19 on page 11). 6 CLK/SEL Clock Input for the DC-DC Converter. This pin is also used to program the operational mode as follows: 0 = Normal operation – the AS1326A operates at a fixed frequency, and switches into automatic powersave operation if the load is minimized. 1 = Forced-PWM mode – the AS1326A operates in low-noise, constant-frequency mode at all loads. Clocked = Forced-PWM mode with the internal oscillator synchronized to this pin in 500 to 1200kHz range. 7PGND N-Channel Power MOSFET Switch Source 8LX Inductor Connection 9POUT Power Output. P-channel synchronous rectifier source. 10 ONN Enable Low (AS1326A only). Must be connected to GND for normal operation. 0 = The AS1326A is on. 1 = The AS1326A is off. ON Enable High (AS1326B only). Must be connected to OUT for normal operation. 0 = The AS1326B is off. 1 = The AS1326B is on. 11 NC Exposed Pad. This pad is not connected internally. It can be used for ground connection between GND and PGND. AS1326A/ AS1326B 4 FB 3 GND 2 REF 1 ISET 6 CLK/SEL 7 PGND 9 POUT 10 ONN/ON 5 OUT 8 LX 11 |
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