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AL8806Q Datasheet

AUTOMOTIVE GRADE BUCK LED DRIVER

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AL8806Q pdf
AL8806Q
HIGH EFFICIENCY 30V 1.6A
AUTOMOTIVE GRADE BUCK LED DRIVER
Description
The AL8806Q is a step-down DC/DC converter designed to drive LEDs
with a constant current. The device can drive up to 8 LEDs, depending
on the forward voltage of the LEDs, in series from a voltage source of
6V to 30V. The AL8806Q switches at frequencies up to 1MHz. This
allows the use of small size external components, hence minimizing
the PCB area needed.
Maximum output current of AL8806Q is set via an external resistor
connected between the VIN and SET input pins. Dimming is achieved
by applying either a DC voltage or a PWM signal at the CTRL input
pin. An input voltage of 0.4V or lower at CTRL switches off the output
MOSFET simplifying PWM dimming.
The AL8806Q has been qualified to AEC-Q100 Grade 1 and is
Automotive Grade supporting PPAPs
Features
LED driving current up to 1.5A
Better than 5% accuracy
High efficiency up to 98%
Optimally controlled switching speeds
Operating input voltage from 6V to 30V
PWM/DC input for dimming control
Built-in output open-circuit protection
Automotive Grade with AEC-Q100 Qualification
MSOP-8EP: Available in “Green” Molding Compound (No Br, Sb)
ƒ Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
ƒ Halogen and Antimony Free. “Green” Device (Note 3)
Automotive Grade
ƒ Qualified to AEC-Q100 Standards for High Reliability
ƒ PPAP Capable (Note 4)
Pin Assignments
Applications
Automotive LED Lamps
Multi-Die LED Driver
Notes:
1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant.
2. See http://www.diodes.com/quality/lead_free.html for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green"
and Lead-free.
3. Halogen- and Antimony-free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and
<1000ppm antimony compounds.
4. Automotive products are AEC-Q100 qualified and are PPAP capable. Automotive, AEC-Q100 and standard products are electrically and thermally the same,
except where specified. For more information, please refer to http://www.diodes.com/quality/product_compliance_definitions/.
Typical Applications Circuit
AL8806Q
Document number: DS36905 Rev. 1 - 2
1 of 13
www.diodes.com
April 2014
© Diodes Incorporated



Diodes Semiconductor Electronic Components Datasheet

AL8806Q Datasheet

AUTOMOTIVE GRADE BUCK LED DRIVER

No Preview Available !

AL8806Q pdf
AL8806Q
Pin Descriptions
Pin Name
SET
GND
CTRL
SW
N/C
VIN
EP
Pin Number
1
2, 3
4
5, 6
7
8
EP
Functions
Set Nominal Output Current Pin. Configure the output current of the device.
GND Pin
Dimming and On/Off Control Input.
Leave floating for normal operation.
(VCTRL = VREF = 2.5V giving nominal average output current IOUTnom = 0.1/RS)
Drive to voltage below 0.4V to turn off output current
Drive with DC voltage (0.5V < VCTRL < 2.5V) to adjust output current from 20% to 100% of IOUTnom
A PWM signal (low level 0.4V and high level > 2.6; transition times less than 1us) allows the output
current to be adjusted below the level set by the resistor connected to SET input pin.
Switch Pin. Connect inductor/freewheeling diode here, minimizing track length at this pin to reduce EMI.
No Connection
Input Supply Pin. Must be locally decoupled to GND with > 2.2µF X7R ceramic capacitor – see applications
section for more information.
Exposed pad:
Connect to GND and thermal mass for enhanced thermal impedance. It should not be used as electrical
ground conduction path.
Functional Block Diagram
Absolute Maximum Ratings (@TA = +25°C, unless otherwise specified.)
Symbol
ESD HBM
ESD MM
ESD CDM
VIN
VSW
VCTRL
ISW-RMS
ISW-PK
TJ
TLEAD
TST
Parameter
Human Body Model ESD Protection
Machine Model ESD Protection
Charged Device Model ESD Protection
Continuous VIN pin voltage relative to GND
Transient VIN pin voltage relative to GND
SW voltage relative to GND
CTRL pin input voltage
DC or RMS Switch current
Peak Switch current (<10%)
Junction Temperature
Lead Temperature Soldering
Storage Temperature Range
Ratings
2.5
200
-0.3 to +36
-0.3 to +40
-0.3 to +36
-0.3 to +6
1.65
3
150
300
-65 to +150
Unit
kV
V
V
V
V
V
A
A
°C
°C
°C
Caution:
Stresses greater than the 'Absolute Maximum Ratings' specified above, may cause permanent damage to the device. These are stress ratings only;
functional operation of the device at these or any other conditions exceeding those indicated in this specification is not implied. Device reliability may be
affected by exposure to absolute maximum rating conditions for extended periods of time.
Semiconductor devices are ESD sensitive and may be damaged by exposure to ESD events. Suitable ESD precautions should be taken when handling
and transporting these devices.
AL8806Q
Document number: DS36905 Rev. 1 - 2
2 of 13
www.diodes.com
April 2014
© Diodes Incorporated



Diodes Semiconductor Electronic Components Datasheet

AL8806Q Datasheet

AUTOMOTIVE GRADE BUCK LED DRIVER

No Preview Available !

AL8806Q pdf
Recommended Operating Conditions (@TA = +25°C, unless otherwise specified.)
Symbol
VIN
VCTRLH
VCTRLDC
VCTRLL
fSW
ISW
TJ
Parameter
Operating Input Voltage relative to GND
Voltage High for PWM Dimming Relative to GND
Voltage range for 20% to 100% DC Dimming Relative to GND
Voltage Low for PWM Dimming Relative to GND
Maximum Switching Frequency
Continuous Switch Current
Junction Temperature Range
Min
6.0
2.6
0.5
0
-40
AL8806Q
Max
30
5.5
2.5
0.4
1
1.5
+125
Unit
V
V
V
V
MHz
A
°C
Electrical Characteristics (@ VIN = 12V, TA = +25°C, unless otherwise specified.)
Symbol
VINSU
VINSH
IQ
IS
VTH
VTH-H
ISET
RCTRL
VREF
RDS(on)
ISW_Leakage
θJA
θJC
Parameter
Internal regulator start up threshold
Internal regulator hysteresis threshold
Quiescent current
Input supply Current
Set current Threshold Voltage
Set threshold hysteresis
SET pin input current
CTRL pin input resistance
Internal Reference Voltage
On Resistance of SW MOSFET
Switch leakage current
Thermal Resistance Junction-to-
Ambient (Note 6)
Thermal Resistance Junction-to-Case
(Note 6)
Conditions
VIN rising
VIN falling
Output not switching (Note 5)
CTRL pin floating f = 250kHz
VCTRL 2.6V or floating.
VSET = VIN-0.1
Referred to internal reference
ISW = 1A
VIN = 30V
(Note 7)
(Note 7)
Min Typ. Max
— — 5.9
100 — 300
— — 350
— 1.8
5
95 100 105
— ±20 —
— 16 22
— 50 —
— 2.5 —
— 0.18 0.35
— — 0.5
— 69 —
— 4.3 —
Unit
V
mV
µA
mA
mV
mV
µA
k
V
μA
°C/W
Notes:
5. AL8806Q does not have a low power standby mode but current consumption is reduced when output switch is inhibited: VSENSE = 0V. Parameter is tested
with VCTRL 2.5V
6. Refer to figure 5 for the device derating curve.
7. Measured on an FR4 51x51mm PCB with 2oz copper standing in still air with minimum recommended pad layout on top layer and thermal vias to bottom
layer maximum area ground plane. For better thermal performance, larger copper pad for heat-sink is needed.
8. Dominant conduction path via exposed pad. Refer to figure 5 for the device derating curve.
AL8806Q
Document number: DS36905 Rev. 1 - 2
3 of 13
www.diodes.com
April 2014
© Diodes Incorporated




Part Number AL8806Q
Description AUTOMOTIVE GRADE BUCK LED DRIVER
Maker Diodes
Total Page 13 Pages
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