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AS1340 Datasheet(PDF) 10 Page - ams AG |
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AS1340 Datasheet(HTML) 10 Page - ams AG |
10 / 16 page www.austriamicrosystems.com Revision 1.10 10 - 16 AS1340 Datasheet - A p p l i c a t i o n I n f o r m a t i o n 9 Application Information Power Supply Concept The AS1340 has an operating voltage range from 2.7 to 5.5V. If the inductor is supplied from the same source the bat- tery disconnect switch can be used as well (see Figure 1 on page 1). In case that a input voltage source is higher than 5.5V, the inductor can be supplied separately up to 50V (see Figure 28), but then the battery disconnect switch cannot be used, because its operating voltage range is limited to 5.5V. Shutdown A logic low on pin EN shuts down the AS1340 and a logic high on EN powers on the device. In shutdown mode the supply current drops to below 1µA to maximize battery life. In case that the battery disconnect switch is used, the battery is disconnected from the output during shutdown. Note: Pin EN should not be left floating. If the shutdown feature is not used, connect EN to VIN. Battery Disconnect The AS1340 has an integrated switch that can be used to disconnect the battery during shutdown. The operation volt- age of this switch is limited to 5.5V. When EN is high, the switch is closed and supplies the inductor. Due to the RON resistance the efficiency is slightly lower if the battery disconnect switch is used. PLOSS = IIN² x RON (EQ 1) Setting Output Voltage Output voltage can be adjusted by connecting a voltage divider between pins LX and FB (see Figure 28). Figure 28. Typical Application (SWVIN and SWOUT not in use.) The output voltage can be adjusted by selecting different values for R1 and R2. For R2, select a value between 10k and 200k Ω. Calculate R1 by: Where: VOUT = VIN to 50V, VFB = 1.25V The input bias current of FB has a maximum value of 100nA which allows for large-value resistors. For less than 1% error, the current through R2 should be 100 times the feedback input bias current (IFB). Supply 2.7V to VOUT 1 EN 7,9 GND 2 VCC 8 FB 5 LX On Off R1 2.2M Ω VOUT = 18V AS1340 L1 4.7µH C1 0.1µF CIN 10µF D1 COUT 1µF R2 165k Ω 3 SWVIN 6 SWOUT 4 POK VIN = 2.7V to 5.5V (EQ 2) R1 R2 VOUT VFB -------------- 1 – ⎝⎠ ⎛⎞ ⋅ = |
Similar Part No. - AS1340_1 |
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Similar Description - AS1340_1 |
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