mic3202 Micrel Semiconductor, mic3202 Datasheet - Page 2

• Manufacturer Part Number: mic3202
• Description: High-brightness Led Driver With Integrated Mosfet And High-side Current Sense
• Manufacturer: Micrel Semiconductor

Ordering Information
Note:
1.
Pin Configuration
Pin Description
Micrel, Inc.
Part Number
MIC3202YME
MIC3202-1YME
September 2010
Number
YM
Pin
EP
1
2
3
4
5
6
7
8
®
is a GREEN RoHS-compliant package. Lead finish is NiPdAu. Mold compound is Halogen Free.
Pin Name
AGND
PGND
GND
VCC
DIM
VIN
CS
EN
LX
Pin Function
Voltage Regulator Output. The VCC pin supplies the power to the internal circuitry. The VCC is 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.
Current-Sense Input. The CS pin provides the high-side current sense to set the LED current using an
external sense resistor.
Input Power Supply. The VIN pin 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 1µF ceramic capacitor is
recommended to be placed as close as possible to VIN pin and the power ground (PGND) pin for
bypassing. Please refer to layout recommendations.
Ground pin for analog circuitry. Internal signal ground for all low power sections.
Enable Input. The EN pin provides a logic level control of the output. The voltage has to be 2.0V or higher
to enable the current regulator. The output stage is also gated by the DIM input. 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).
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.
Power Ground pin for Internal Power FET. Power Ground (PGND) is the ground path for the high current.
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.
Drain of Internal Power MOSFET. The LX pin 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.
Connect to PGND.
(1)
MIC3202-1YME
MIC3202YME
Marking
MIC3202/MIC3202-1
8-Pin ePAD SOIC
Junction Temperature Range
−40°C to +125°C
−40°C to +125°C
2
8-Pin SOIC
8-Pin SOIC
Package
MIC3202/MIC3202-1
M9999-091710-A
Non-Dither
Dither
PWM