A8430EEK Allegro Microsystems Inc, A8430EEK Datasheet - Page 2

• Manufacturer Part Number: A8430EEK
• Description: IC LED DRVR WHITE BCKLGHT 5-MLPD
• Manufacturer: Allegro Microsystems Inc
• Type: Backlight, White LEDr

Specifications of A8430EEK

• Constant Current: Yes
• Topology: PWM, Step-Up (Boost)
• Number Of Outputs: 1
• Internal Driver: Yes
• Type - Primary: Backlight
• Type - Secondary: White LED
• Frequency: 1.2MHz
• Voltage - Supply: 2.5 V ~ 10 V
• Voltage - Output: 36V
• Mounting Type: Surface Mount
• Package / Case: 5-WDFN Exposed Pad
• Operating Temperature: -40°C ~ 85°C
• Current - Output / Channel: 20mA
• Internal Switch(s): Yes
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Efficiency: -

SW Pin ................................................–0.3 V to 36 V
Remaining Pins .................................. –0.3 V to 10 V
Ambient Operating Temperature, T
Junction Temperature, T
Storage Temperature, T
AB SO LUTE MAX I MUM RAT INGS
R
Same pad footprint as SOT-23-5
θJA
White LED Driver Constant Current Step-up Converter
Approximate actual size
= 50 °C/W, see note 1, page 2
GND
SW
FB
A8430 MLPD
J(max)
S
1
2
3
.................... –55°C to 150°C
............................... 150°C
5
4
A
....... –40°C to 85°C
VIN
EN
A8430
The A8430 is a noninverting boost converter that steps-up the input
voltage, to provide a programmable constant current output at up to
36 V for driving white LEDs in series. Driving LEDs in series ensures
identical currents and uniform brightness. Up to four white LEDs can
be driven at 20 mA from a single cell Li-ion or a multicell NiMH power
source. Up to seven white LEDs can be driven by increasing the supply
voltage up to 10 V.
The A8430 incorporates a power switch and feedback sense amplifier
to provide a solution with minimum external components. The output
current can be set by adjusting a single external sense resistor and can
be varied with a voltage or filtered PWM signal when dimming control
is required. The high switching frequency of 1.2 MHz allows the use of
small inductor and capacitor values.
The A8430 is provided in a 5-pin 3 mm x 3 mm MLP package (part
number suffix EK), that has a nominal height of only 0.75 mm. The
lead-free version (part number suffix EK-T) has 100% lead-free matte
tin leadframe plating.
FEATURES
APPLICATIONS
Use the following complete part number when ordering:
Part Number
A8430EEK-T
A8430EEK
Output voltage up to 36 V
2.5 V to 10 V input
Drives up to 4 LEDs at 20 mA from a 2.5 V supply
Drives up to 5 LEDs at 20 mA from a 3 V supply
1.2 MHz switching frequency
300 mA switch current limit
1 µA shutdown current
LED backlights
Portable battery-powered equipment
Cellular phones
PDAs (Personal Digital Assistant)
Camcorders, personal stereos, MP3 players, cameras
Mobile GPS systems
5-pin, MLPD
5-pin, MLPD
Package
Lead-Free, Surface Mount
Surface Mount
Description