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A843, A8430, A8430EEK

Table of contents:
Info of A843
Info of A8430
Info of A8430EEK

A843, A8430, A8430EEK Selling Leads, Datasheet

MFG:Allegro Microsystems Inc Category:Integrated Circuits (ICs) Package Cooled:QFN D/C:05+

A843, A8430, A8430EEK Datasheet download

Five Points

Part Number: A843

Category: Integrated Circuits (ICs)

MFG: Allegro Microsystems Inc

Package Cooled: QFN

D/C: 05+

Description: IC WHITE LED DRIVER 5-MLP

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A8430 General Description

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.

A8430 Maximum Ratings

SW Pin ................................................0.3 V to 36 V
Remaining Pins .................................. 0.3 V to 10 V
Ambient Operating Temperature, T_A....... 40°C to 85°C
Junction Temperature, T_J(max)...............................150°C
Storage Temperature, T_S .................... 55°C to 150°C

A8430 Features

`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 A shutdown current

A8430 Typical Application

·LED backlights
·Portable battery-powered equipment
·Cellular phones
·PDAs (Personal Digital Assistant)
·Camcorders, personal stereos, MP3 players, cameras
·Mobile GPS systems

A8430 Connection Diagram

A8430EEK Parameters

Technical/Catalog Information	A8430EEK
Vendor	Allegro Microsystems Inc
Category	Integrated Circuits (ICs)
Package / Case	5-MLPD
Packaging	Tube
Current - Output / Channel	20mA
Number of Outputs	1
Type	Backlight, White LED
Voltage - Supply	2.5 V ~ 10 V
Voltage - Output	36V
Topology	Switched Inductor, Step-Up (Boost)
Frequency	1.2MHz
Operating Temperature	-40°C ~ 85°C
Efficiency	-
Lead Free Status	Contains Lead
RoHS Status	RoHS Non-Compliant
Other Names	A8430EEK A8430EEK

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