CAT3648 Series

LED Driver, 4-Channel with 32 Dimming Levels

Catalog

LED Driver, 4-Channel with 32 Dimming Levels

Part	Dimming	Internal Switch(s)	Frequency [Min]	Frequency [Max]	Voltage - Supply (Min) [Min]	Number of Outputs	Package / Case	Supplier Device Package	Voltage - Supply (Max)	Applications	Voltage - Output	Current - Output / Channel [custom]	Topology	Mounting Type	Type	Operating Temperature [Max]	Operating Temperature [Min]
ON Semiconductor CAT3648HV3-GT2	Multi-Step		1 MHz	1.3 MHz	2.5 V	4	16-WFQFN Exposed Pad	16-TQFN (3x3)	5.5 V	Backlight	7 V	25 mA	Switched Capacitor (Charge Pump)	Surface Mount	DC DC Regulator	85 °C	-40 °C

Catalog

LED Driver, 4-Channel with 32 Dimming Levels

Key Features

• High efficiency 1.33x charge pump

• Quad-mode charge pump: 1x, 1.33x, 1.5x, 2x

• Drives up to 4 LEDs at 25 mA each

• 1-wire EZDim™ 32 linear steps

• 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 CAT3648 is a high efficiency fractional charge pump that can drive up to four LEDs programmable by a one wire digital interface. The inclusion of a 1.33x fractional charge pump mode increases 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 EN/DIM logic input functions as a chip enable and a digital dimming interface for setting the current in all the LED channels. The 1-wire pulse-dimming interface supports 32 linear steps from full-scale down to zero current.