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LADLD30 Datasheet(PDF) 2 Page - Unisonic Technologies |
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LADLD30 Datasheet(HTML) 2 Page - Unisonic Technologies |
2 / 8 page LADLD30 Preliminary CMOS IC UNISONICTECHNOLOGIESCO.,LTD 2 of 8 www.unisonic.com.tw QW-R502-330.c MARKING INFORMATION UTC Date Code LADLD30 L: Lead Free G: Halogen Free Lot Code PIN CONFIGURATION 1 2 3 45 6 7 8 VIN GND FB VOUT VOUT VIN VCNTL POK EN PIN DESCRIPTION PIN NO. PIN NAME DESCRIPTION 1 GND Ground pin. 2 FB There’s an external resistor divider connected to this pin which is necessary to give the feedback voltage to the regulator. The external circuit is combined as the follow: between VOUT and FB is R1(connected with a bypass capacitor which can improve the load transient response),and between FB and ground is R2.The value of R2 and R1 are recommended between 100Ω~10kΩ.So the output voltage is equals: VOUT=0.8·(1+ R2 R1 )(V) 3 4 VOUT The output voltage pin of the regulator. There should be set an output capacitor to compensate for closed-loop and also to improve transient responses. It’s necessary to connect Pin 3 and Pin 4 together by wide tracks. 5 VIN This pin is the main supply input. It’s necessary to connect the Exposed Pad and VIN together for lower dropout voltage. Monitoring this pin’s voltage can reset Power-On. 6 VCNTL Power input pin of the control circuitry. Connecting this pin to a +5V (recommended) supply voltage provides the bias for the control circuitry. The voltage at this pin is monitored for Power-On Reset purpose. 7 POK Output pin for Power-OK signal output. Being an open drain output, through senescing FB voltage, this pin can show the users the output voltage’s states. That’s this pin will be low under any of these tow situations: the rising FB voltage is not above the VPOK threshold; the falling FB voltage is below the VPNOK threshold. That indicates the output voltage is not ready for users. 8 EN Input Enable control pin. The output voltage can be shut down when this pin is below 0.3V. This pin’s voltage can be set higher than VCNTL voltage by an internal 10μA current source, and then the regulator will begin working normally. |
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