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AIC1631CS Datasheet(PDF) 6 Page - Analog Intergrations Corporation |
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AIC1631CS Datasheet(HTML) 6 Page - Analog Intergrations Corporation |
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6 / 10 page  AIC1631 6 PIN DESCRIPTIONS AIC1631/ AIC1631-3 / AIC1631-5 PIN 1: ILIM/SD- 1. Connected to VIN pin through a resistor to set the switch peak current. It serves to protect IC and in- ductor, as well as to im- prove efficiency and output ripples. However, supply capability of the AIC1631 is limited by the current limit resistor. (See typical per- formance characteristics). The ILIM/SD pin should be shorted to VIN pin if limiting on switch peak current is not intended. 2. The AIC1631 goes in shut- down mode and consumes less than 10 µA when ILIM/SD pin is pulled to ground. PIN 2: VIN - Input supply. PIN 3: SW - Drain of the power switch, to be connected to inductor/ di- ode. PIN 4:SGND - Ground connected to source of power switch. PIN 5:CGND - Ground for control circuits of the IC. It should be separated from SGND to avoid the inter- ference. PIN 6:LBO - Open drain output of the bat- tery low detector, with 45 Ω “ON resistance” at VIN=2V. It is pulled low when the voltage on LBI pin is below 1.22V. PIN 7:LBI - The noninverting input of the battery low detector, of which the inverting input is internally connects to 1.22V voltage ref- erence. PIN 8:VOUT - The output voltage feedbacks to the IC through this pin. AIC1631A PIN 1: ILIM/SD- 1. Connected to VIN pin through a resistor to set the switch peak current. It serves to protect IC and inductor, as well as to improve efficiency and output ripples. However, supply capability of the AIC1631A is limited by the current limit resis- tor. (See typical performance characteristics). The ILIM/SD pin should be shorted to VIN pin if limiting on switch peak current is not intended. 2. The AIC1631A goes in shut- down mode and consumes less than 10 µA when ILIM/SD pin is pulled to ground. PIN 2: VIN - Input supply. PIN 3: SW - Drain of the power switch, to be connected to inductor/ diode. PIN 4: GND - Ground. PIN 5: FB - Output voltage can either be internally set to 5 volt by grounding FB pin, or be exter- nally set to an arbitrary voltage by applying to FB pin the divider voltage of two divider resistors. VOUT voltage is given by the following equation: 1 0.617 V R2 R1 OUT − = where R1 = Resistor connected between FB pin and VOUT pin. R2= Resistor connected be- tween FB pin and ground. VOUT=Output voltage to be set. PIN 6: LBO - Open drain output of the battery low detector, with 45 Ω “ON re- sistance” at VIN=2V. It is pulled low when the voltage on LBI pin is below 1.22V. |
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