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AS1331-BTDT-25 Datasheet(PDF) 2 Page - ams AG |
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AS1331-BTDT-25 Datasheet(HTML) 2 Page - ams AG |
2 / 16 page www.austriamicrosystems.com Revision 1.03 2 - 16 AS1331 Datasheet - P i n A s s i g n m e n t s 4 Pin Assignments Figure 2. Pin Assignments (Top View) Pin Descriptions Table 1. Pin Descriptions Pin Name Pin Number Description VOUT 1 Output of the Buck/Boost Converter. SW1 2 Buck/Boost Switch Pin. Connect the inductor from SW1 to SW2 PGND 3 Power Ground. Both GND pins must be connected. SW2 4 Buck/Boost Switch Pin. Connect the inductor from SW1 to SW2. An optional Schottky diode can be connected between this pin and VOUT to increase efficiency. VIN 5 Input Supply Pin. A minimum 2.2µF capacitor should be placed between VIN and GND. EN 6 Enable Pin. Logic controlled shutdown input. 1 = Normal operation; 0 = Shutdown; quiescent current <1µA. LBI 7 Low Battery Comperator Input. 1.25V Threshold. May not be left floating. If connected to GND LBO is working as Output Power okay. LBO 8 Low Battery Comperator Output. This open-drain output is low when the voltage on LBI is less than 1.25V. GND 9 Ground. Both GND pins must be connected. FB 10 Feedback Pin. Feedback input for the adjustable version. Connect a resistor divider tap to this pin. The output voltage can be adjusted from 2.5V to 3.3V by: VOUT = 1.25V[1 + (R1/R2)] Note: For the fixed Output Voltage Version contact this pin to VOUT. NC 11 Exposed Pad. This pad is not connected internally. It can be used for ground connection between GND and PGND. AS1331 SW2 2 SW1 4 VOUT 1 PGND 3 LBI 7 LBO 8 GND 9 FB 10 11 VIN 5 EN 6 |
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