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AS1337 Datasheet(PDF) 2 Page - ams AG |
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AS1337 Datasheet(HTML) 2 Page - ams AG |
2 / 14 page www.austriamicrosystems.com/DC-DC_Step-Up/AS1337 Revision 1.04 2 - 14 AS1337 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 2. Pin Descriptions Pin Name Pin Number Description VOUT 1 Output Voltage. Bias is derived from VOUT when VOUT exceeds VIN. PCB trace length from VOUT to the output filter capacitor(s) should be as short and wide as is practical. LX 2 Switch Pin. Connect an inductor between this pin and VIN. Keep the PCB trace lengths as short and wide as is practical to reduce EMI and voltage overshoot. If the inductor current falls to zero, or pin EN is low, an internal 100 Ω anti-ringing switch is connected from this pin to VIN to minimize EMI. Note: An optional Schottky diode can be connected between this pin and VOUT. PGND 3 Power Ground. Provide a short, direct PCB path between this pin and the out- put capacitor(s). GND 4 Ground EN 5 Enable Pin. Logic controlled enable input. 1 = Normal operation 0 = Shutdown Note: In a typical application, EN should be connected to VIN through a 1M Ω pull-up resistor. POK 6 POK. High when VOUT is within regulation. VIN 7 Input Voltage. The AS1337 gets its start-up bias from VIN unless VOUT exceeds VIN, in which case the bias is derived from VOUT. Thus, once started, operation is completely independent from VIN. Operation is only limited by the output power level and the internal series resistance of the supply. FB 8 Feedback Pin. Feedback input to the gm error amplifier. Connect a resistor divider tap to this pin. The output voltage can be adjusted from 2.5V to 5V by: VOUT = 1.23V[1 + (R1/R2)] GND 9 Exposed Pad Ground 5 EN 3 PGND 2 LX 1 VOUT 6POK 7VIN 8FB AS1337 4 GND 9GND |
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