MAX6977AAE+T

Voltage - Output:	5.5V
Base Part Number:	MAX6977
Supplier Device Package:	16-SSOP
Package / Case:	16-SSOP (0.209", 5.30mm Width)
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 125°C (TA)
Applications:	Lighting, Signage
Dimming:	--
Frequency:	--
Current - Output / Channel:	55mA
Series:	--
Voltage - Supply (Max):	5.5V
Voltage - Supply (Min):	3V
Number of Outputs:	8
Internal Switch(s):	Yes
Topology:	Shift Register
Type:	Linear
Part Status:	Active
Packaging:	Tape & Reel (TR)

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Introduction

MAX6977AAE+T is an advanced, 5-channel, serial-in/parallel-out LED driver by Maxim Integrated. It was designed to control the intensity of five separate LED elements and is suited for applications such as LCD backlighting and LED lighting fixtures. This LED driver is a member of Maxim\'s Power Management Integrated Circuits (PMIC) family, and is categorized as a LED Driver.

Application Field

MAX6977AAE+T is particularly useful for applications that require different illumination on multiple LEDs, such as LCD backlighting in various device displays, and LED lighting fixtures for general illumination. While the built-in multiple dimming functions, such as linear dimming, pulse-width-modulated (PWP) dimming, and current-based analog dimming, make MAX6977AAE+T suitable for displays requiring multiple intensity settings, its 6-bit resolution gives designers the flexibility to achieve various effects and color palettes. The device has a wide operating voltage ranging from 4.75V to 12V, and its low quiescent current of just 0.5uA makes it an energy-efficient choice. In addition, the MAX6977AAE+T has built-in thermal shutdown protection and short circuit protection, making it reliable and robust.

Working Principle

The MAX6977AAE+T works by converting serial input data into a parallel output current. This is done utilizing its five serial data inputs, data latch enable (DLE), and five output enable inputs. The device also contains five programmable output currents that vary from 5mA to 60mA, as well as a number of digital dimming functions. The serial data inputs are used to program the desired current levels of the output channels, from 5mA to 60mA. The controller shifts the data from serial to parallel using the DLE signal. The output enable (EN) pins can be used to turn off individual output channels. In addition, the DIM and DIMSEL pins are used for digital dimming functions such as PWM dimming and linear dimming. The MAX6977AAE+T LED driver is a current-sink output device, meaning that the output current flows from the VOUT pin to ground. This creates the necessary output voltage for the LEDs, which is determined by the voltage drop across the device.

Conclusion

The MAX6977AAE+T is a versatile LED driver, designed to control the intensity of up to five separate LED elements. It is suitable for a wide range of applications, including LCD backlighting and LED lighting fixtures. It works by converting serial input data into a parallel output current utilizing its data inputs, data latch enable, and output enable inputs. With its wide operating voltage, low quiescent current, and built-in protection, the MAX6977AAE+T makes a reliable and robust choice for LED driving applications.

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