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MAQ3203YM Datasheet(PDF) 2 Page - Micrel Semiconductor |
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MAQ3203YM Datasheet(HTML) 2 Page - Micrel Semiconductor |
2 / 23 page Micrel, Inc. MAQ3203 March 2011 2 M9999-032411-A Ordering Information (1) Part Number Marking Junction Temperature Range Package PWM MAQ3203YM MAQ3203YM −40°C to +125°C 8-Pin SOIC Dither Note: 1. YM ® is a GREEN RoHS compliant package. Lead finish is NiPdAu. Mold compound is Halogen Free. Pin Configuration 8-Pin SOIC MAQ3203 Pin Description Pin Number Pin Name Pin Function 1 VCC Voltage Regulator Output. The VCC pin supplies the power to the internal circuitry. The VCC in the output of a linear regulator which is powered from VIN. A 1µF ceramic capacitor is recommended for bypassing and should be placed as close as possible to the VCC and AGND pins. Do not connect to an external load. 2 CS Current-Sense Input. The CS pin provides the high-side current sense to set the LED current with an external sense resistor. 3 VIN Input Power Supply. VIN is the input supply pin to the internal circuitry and the positive input to the current sense comparator. Due to the high frequency switching noise, a 10µF ceramic capacitor is recommended to be placed as close as possible to VIN and the power ground (PGND) pin for bypassing. Please refer to layout recommendations. 4 AGND Ground pin for analog circuitry. Internal signal ground for all low power sections. 5 EN Enable Input. The EN pin provides a logic level control of the output and the voltage has to be 2.0V or higher to enable the current regulator. The output stage is gated by the DIM pin. When the EN pin is pulled low, the regulator goes to off state and the supply current of the device is greatly reduced (below 1µA). In the off state, during this period the output drive is placed in a "tri-stated" condition, where MOSFET is in an “off” or non-conducting state. Do not drive the EN pin above the supply voltage. 6 DIM PWM Dimming Input. The DIM pin provides the control for brightness of the LED. A PWM input can be used to control the brightness of LED. DIM high enables the output and its voltage has to be at least 2.0V or higher. DIM low disables the output, regardless of EN “high” state. 7 PGND Power Ground Pin for Power FET. Power Ground (PGND) is for the high-current switching with hysteretic mode. The current loop for the power ground should be as small as possible and separate from the Analog ground (AGND) loop. Refer to the layout considerations for more details. 8 DRV Gate-Drive Output. Connect to the gate of an external N-channel MOSFET. The drain of the external MOSFET connects directly to the inductor and provides the switching current necessary to operate in hysteretic mode. Due to the high frequency switching and high voltage associated with this pin, the switch node should be routed away from sensitive nodes. |
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