Microchip MAQ3203YM Handleiding

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MAQ3203
High- Brightness LED Driver Controller
with High Side Current Sense-
Micrel Inc. • 2180 Fortune Drive • Jose, CA 95131 • USA • tel +1 (408) 944 0800 • fax + 1 (408) 474 1000 • San - - http://www.micrel.com
April
20, 2015
Revision 1.2
General Description
The MAQ3203 is a hysteretic, step down, constant- -
current, High Brightness LED (HB LED) driver. It provides -
an ideal solution for interior/exterior lighting, architectural
and ambient lighting, LED bulbs, and other general
illumination applications.
The MAQ3203 is well suited for lighting applications
requiring a wide-input voltage range. The hysteretic control
gives good supply rejection and fast response during load
transients and PWM dimming. The high side current -
sensing and on chip current sense amplifier delivers LED - -
current with 5% accuracy. An external high side current±- -
sense resistor is used to set the output current.
The MAQ3203 offers a dedicated PWM input (DIM) which
enables a wide range of pulsed dimming. A high-frequency
switching operation up to 1.5MHz allows the use of smaller
external components minimizing space and cost. The
MAQ3203 offers frequency dither feature for EMI control.
The MAQ3203 perates o over a junction temperature from
− ° + °40 C to 125 C 8-and is available in an pin SOIC
p -ackage. The MAQ3203 is AEC Q100 qualified for
automotive applications.
Datasheets and support documentation are available on
Micrel’s web site at: www.micrel.com.
Features
• -AEC Q100 qualified
• 4.5V to 42V input voltage range
• > High efficiency ( 90%)
• ± 5% LED current accuracy
• Dither enabled for low EMI
• - High side current sense
• Dedicated dimming control input
• Hysteretic control (no compensation!)
• Up to 1.5MHz switching frequency
• Adjustable constant LED current
• - Over temperature protection
• − ° + ° 40 C to 125 C junction temperature range
Applications
• Automotive lighting
• Industrial lighting
Typical Application
MAQ3203 Step- Down LED Driver
Micrel, Inc.
MAQ3203
20, 2015 2 Revision 1.2
Ordering Information
Part Number
( )1
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 Conguration
8-Pin ( SOIC M)
(Top View)
Pin Description
Pin Number Pin Name Pin Function
1 VCC
Voltage Regulator Output. The V
CC 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. 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.
Micrel, Inc.
MAQ3203
20, 2015 3 Revision 1.2
Absolute Maximum Ratings( )2
VIN to PGND .................................................. − +0.3V to 45V
VCC to PGND ................................................ − +0.3V to 6.0V
CS to PGND ........................................ −0.3V to (V
IN +0.3V)
EN to AGND ........................................ −0.3V to (V
IN +0.3V)
DIM to AGND ...................................... −0.3V to (V
IN +0.3V)
DRV to PGND .................................... −0.3V to (V
CC +0.3V)
PGND AGND to ........................................... − +0.3V to 0.3V
Junction Temperature ................................................ 150°C
Storage Temperature Range .................... − + °60°C to 150 C
Lead Temperature (soldering, 10s) ............................ 260°C
ESD Ratings(4)
HBM ...................................................................... 1.5kV
MM ......................................................................... 200V
Operating Ratings( )3
Supply Voltage (VIN) .......................................... 4.5V to 42V
Enable Voltage (VEN) .............................................. 0V to V
IN
Dimming Voltage (VDIM) .................................................................
0V to VIN
Junction Temperature (TJ) ........................ − ° + °40 C to 125 C
Junction Thermal Resistance
SOIC (θJA) ....................................................... 98.9°C/W
SOIC (θJC) ....................................................... 48.8°C/W
Electrical Characteristics(5)
VIN
= VEN = VDIM = 12V; CVCC µ T= 1.0 F; J = 25°C, bold values indicate 40− ° ≤C TA C; ≤ +125°unless noted.
Symbol Parameter Condition Min. Typ. Max. Units
Input Supply
VIN Input Voltage Range (V
IN)
4.5
42
V
IS Supply Current DRV = open 1 3 mA
ISD Shutdown Current VEN = 0V 1 µA
UVLO VIN UVLO Threshold VIN rinsing 3.2 4 4.5 V
UVLOHYS VIN UVLO Hysteresis 500 mV
VCC Supply
VCC VCC Output Voltage VIN = 12V, ICC
= 10mA 4.5 5 5.5 V
Current Limit
VCS(MAX) Current Sense Upper Threshold VCS(MAX ) = VIN V−CS 201.4 212 222.6 mV
199 212 225
VCS(MIN) Sense Voltage Threshold Low VCS(MIN ) = VIN V−CS
168 177 186 mV
165 177 189
VCSHYS VCS Hysteresis 35 mV
Current Sense Response Time VCS Rising
50
ns
VCS Falling 70
CS Input Current VIN V−CS
= 220mV 0.5 10 µA
Notes:
2. Exceeding the absolute maximum ratings may damage the device.
3. The device is not guaranteed to function outside its operating ratings.
4. Devices are ESD sensitive. Handling precautions are recommended. Human body model, 1.5k in series with 100pF.Ω
5. Specification for packaged product only.

Product specificaties

Merk: Microchip
Categorie: Niet gecategoriseerd
Model: MAQ3203YM

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