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MAQ3203YM Datasheet(PDF) 2 Page - Micrel Semiconductor

Part # MAQ3203YM
Description  High-Brightness LED Driver Controller with High-Side Current Sense
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Manufacturer  MICREL [Micrel Semiconductor]
Direct Link  http://www.micrel.com
Logo MICREL - Micrel Semiconductor

MAQ3203YM Datasheet(HTML) 2 Page - Micrel Semiconductor

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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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