Specification	CAT3644HV3-GT2

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

CAT3644 Series

LED Driver, 4-Channel

Part	Dimming	Package / Case	Voltage - Supply (Max)	Topology	Number of Outputs	Internal Switch(s)	Current - Output / Channel [custom]	Operating Temperature [Max]	Operating Temperature [Min]	Mounting Type	Supplier Device Package	Applications	Frequency [Min]	Frequency [Max]	Voltage - Output	Voltage - Supply (Min) [Min]	Type
ON Semiconductor CAT3644HV3-GT2	Multi-Step	16-WFQFN Exposed Pad	5.5 V	Switched Capacitor (Charge Pump)	4		25 mA	85 °C	-40 °C	Surface Mount	16-TQFN (3x3)	Backlight	1 MHz	1.3 MHz	7 V	2.5 V	DC DC Regulator

Pricing

Prices provided here are for design reference only. For realtime values and availability, please visit the distributors directly

Distributor	Package	Quantity	$

Description

General part information

CAT3644 Series

The CAT3644 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 2.5 V to 5.5 V. The EN/DIM logic input functions as a chip enable and a digital dimming interface for current setting of all LEDs. Six different current ratios are available via the interface.