LM2756 Series

Multi-display inductorless LED driver with 32 exponential dimming steps in micro SMD

Catalog

Multi-display inductorless LED driver with 32 exponential dimming steps in micro SMD

Part	Outputs and Type	Outputs and Type	Features	Utilized IC / Part	Current - Output / Channel [custom]	Voltage - Input [Min]	Voltage - Input [Max]	Supplied Contents	Topology	Package / Case	Supplier Device Package	Operating Temperature [Min]	Operating Temperature [Max]	Current - Output / Channel	Dimming	Mounting Type	Voltage - Supply (Max)	Applications	Voltage - Output [Max]	Voltage - Output [Min]	Internal Switch(s)	Type	Frequency	Number of Outputs
Texas Instruments LM2756TMEV	8	Non-Isolated	Dimmable	LM2756	20 mA	2.7 V	5.5 V	Board(s)
Texas Instruments LM2756TM/NOPB									Switched Capacitor (Charge Pump)	20-WFBGA DSBGA	20-DSBGA	-30 °C	85 °C	30 mA	I2C	Surface Mount	5.5 V	Backlight	4 V	2 V		DC DC Regulator	1.3 MHz	8

Catalog

Multi-display inductorless LED driver with 32 exponential dimming steps in micro SMD

Key Features

• Drives up to 8 LEDs with up to 30mA of Diode Current Each32 Exponential Dimming Steps with 800:1 Dimming Ratio for Group A (Up to 6 LEDs)8 Linear Dimming States for Groups B (Up to 3 LEDs) and D1C (1 LED)Programmable Auto-Dimming Function3 Independently Controlled LED Groups Via I2C Compatible InterfaceUp to 90% EfficiencyTotal Solution Size < 21mm2Low Profile 20 Bump DSBGA Package (1.615mm × 2.015mm × 0.6mm)0.4% Accurate Current MatchingInternal Soft-Start Limits Inrush CurrentTrue Shutdown Isolation for LED’sWide Input Voltage Range (2.7V to 5.5V)Active High Hardware EnableAll trademarks are the property of their respective owners.Drives up to 8 LEDs with up to 30mA of Diode Current Each32 Exponential Dimming Steps with 800:1 Dimming Ratio for Group A (Up to 6 LEDs)8 Linear Dimming States for Groups B (Up to 3 LEDs) and D1C (1 LED)Programmable Auto-Dimming Function3 Independently Controlled LED Groups Via I2C Compatible InterfaceUp to 90% EfficiencyTotal Solution Size < 21mm2Low Profile 20 Bump DSBGA Package (1.615mm × 2.015mm × 0.6mm)0.4% Accurate Current MatchingInternal Soft-Start Limits Inrush CurrentTrue Shutdown Isolation for LED’sWide Input Voltage Range (2.7V to 5.5V)Active High Hardware EnableAll trademarks are the property of their respective owners.

Description

The LM2756 is a highly integrated, switched-capacitor, multi-display LED driver that can drive up to 8 LEDs in parallel with a total output current of 180mA. Regulated internal current sources deliver excellent current and brightness matching in all LEDs. The LED driver current sinks are split into three independently controlled groups. The primary group (Group A) can be configured to drive four, five or six LEDs for use in the main phone display, while the secondary group (Group B) can be configured to drive one, two or three LEDs for driving secondary displays, keypads and/or indicator LEDs. An additional driver, D1C, is provided for additional indicator lighting functions. The device provides excellent efficiency without the use of an inductor by operating the charge pump in a gain of 3/2 or in Pass-Mode. The proper gain for maintaining current regulation is chosen, based on LED forward voltage, so that efficiency is maximized over the input voltage range. The LM2756 is available in TI's tiny 20-bump, 0.4mm pitch, thin DSBGA package. The LM2756 is a highly integrated, switched-capacitor, multi-display LED driver that can drive up to 8 LEDs in parallel with a total output current of 180mA. Regulated internal current sources deliver excellent current and brightness matching in all LEDs. The LED driver current sinks are split into three independently controlled groups. The primary group (Group A) can be configured to drive four, five or six LEDs for use in the main phone display, while the secondary group (Group B) can be configured to drive one, two or three LEDs for driving secondary displays, keypads and/or indicator LEDs. An additional driver, D1C, is provided for additional indicator lighting functions. The device provides excellent efficiency without the use of an inductor by operating the charge pump in a gain of 3/2 or in Pass-Mode. The proper gain for maintaining current regulation is chosen, based on LED forward voltage, so that efficiency is maximized over the input voltage range. The LM2756 is available in TI's tiny 20-bump, 0.4mm pitch, thin DSBGA package.