CAT3649 Series

LED Driver, 6-Channel, with 32 Dimming Levels and PWM

Catalog

LED Driver, 6-Channel, with 32 Dimming Levels and PWM

Part	Number of Outputs	Voltage - Output	Topology	Voltage - Supply (Min) [Min]	Operating Temperature [Max]	Operating Temperature [Min]	Frequency [Min]	Frequency [Max]	Package / Case	Dimming	Type	Voltage - Supply (Max)	Supplier Device Package	Internal Switch(s)	Applications	Current - Output / Channel [custom]	Mounting Type
ON Semiconductor CAT3649HV3-GT2	6	7 V	Switched Capacitor (Charge Pump)	2.4 V	85 °C	-40 °C	1 MHz	1.3 MHz	16-WFQFN Exposed Pad	Analog PWM	DC DC Regulator	5.5 V	16-TQFN (3x3)		Backlight	25 mA	Surface Mount

Catalog

LED Driver, 6-Channel, with 32 Dimming Levels and PWM

Key Features

• High Efficiency 1.33x Charge Pump

• Quad-mode Charge Pump: 1x, 1.33x, 1.5x, 2x

• Drives up to 6 LEDs at 25 mA Each

• PWM Dimming 100 Hz to 200 kHz for CABC

• 1-wire EZDimTM32 Linear Steps (ADIM)

• Power Efficiency up to 92%

• Low Noise Input Ripple in All Modes

• Zero Current Shutdown Mode

• Soft Start and Current Limiting

• Short Circuit Protection

• Thermal Shutdown Protection

Description

The CAT3649 is a high efficiency fractional charge pump that can drive up to six LEDs. The inclusion of a 1.33x fractional charge pump mode increases the device efficiency by up to 10% over traditional 1.5x charge pumps with no added external capacitors.Low noise input ripple is achieved by operating at a constant switching frequency which allows the use of small external ceramic capacitors. The multi-fractional charge pump supports a wide range of input voltages from 2.4 V to 5.5 V.The LED current can be adjusted in different ways. The full-scale LED current is set to 25 mA once the device is enabled. Analog dimming in 32 linear steps is achieved via a 1-wire pulse-dimming input (ADIM). Further adjustment of the LED current can be done by applying a pulse width modulation (PWM) signal on the PWM input. The PWM dimming control is compatible with content adaptive brightness control (CABC) for a wide range of PWM signal frequency up to 200 kHz.The CAT3649 can be shut down by holding the ADIM or PWM input in a logic low condition for greater than 30 ms.