CAT4240 Series

LED Driver, Boost Converter, 6 Watt

Catalog

LED Driver, Boost Converter, 6 Watt

Part	Voltage - Output	Voltage - Supply (Max)	Voltage - Supply (Min) [Min]	Internal Switch(s)	Type	Dimming	Package / Case	Number of Outputs	Current - Output / Channel	Topology	Mounting Type	Operating Temperature [Max]	Operating Temperature [Min]	Frequency	Voltage - Input	Utilized IC / Part	Features	Supplied Contents	Outputs and Type
ON Semiconductor CAT4240TD-GT3	38 V	5.5 V	2.8 V		DC DC Regulator	Analog PWM	SOT-23-5 Thin TSOT-23-5	1	750 mA	Step-Up (Boost)	Surface Mount	85 °C	-40 °C	1 MHz
ON Semiconductor CAT4240AEVB															5 VDC 12 VDC	CAT4240	Dimmable	Board(s)	1 Non-Isolated Output

Catalog

LED Driver, Boost Converter, 6 Watt

Key Features

• Switch Current Limit 750 mA

• Drives High Voltage LED strings (38 V)

• Up to 94% Efficiency

• Low Quiescent Ground Current 0.6 mA

• 1 MHz Fixed Frequency Low noise Operation

• Soft start "in-rush" current limiting

• Shutdown current less than 1 µA

• Open LED Overvoltage Protection

• Automatic Shutdown at 1.9 V (UVLO)

• Thermal overload protection

Description

The CAT4240 is a DC-DC step-up converter that delivers an accurate constant current ideal for driving LEDs. Operation at a fixed switching frequency of 1 MHz allows the device to be used with small value external ceramic capacitors and inductor. LEDs connected in series are driven with a regulated current set by the external resistor R1. The CAT4240 high-voltage output stage is perfect for driving mid-size and large panel displays containing up to ten white LEDs in series.LED dimming can be done by using a DC voltage, a logic signal, or a pulse width modulation (PWM) signal. The shutdown input pin allows the device to be placed in power-down mode with 'zero' quiescent current.In addition to thermal protection and overload current limiting, the device also enters a very low power operating mode during 'Open LED' fault conditions.