PAM2842RGR

Voltage - Output:	--
Base Part Number:	PAM2842
Supplier Device Package:	20-TSSOP-EP
Package / Case:	20-TSSOP (0.173", 4.40mm Width) Exposed Pad
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 85°C (TA)
Applications:	Backlight
Dimming:	Analog, PWM
Frequency:	--
Current - Output / Channel:	3.5A (Switch)
Series:	--
Voltage - Supply (Max):	40V
Voltage - Supply (Min):	5.5V
Number of Outputs:	1
Internal Switch(s):	Yes
Topology:	SEPIC, Step-Down (Buck), Step-Up (Boost)
Type:	DC DC Regulator
Part Status:	Obsolete
Packaging:	Tape & Reel (TR)

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Introduction to PMIC - LED Drivers

Power Management Integrated Circuit (PMIC) is a type of integrated circuit (IC) that\'s used to manage a system\'s overall power. PMICs are most often used in battery-operated devices, where power saving is important. The PMIC is basically a switch-based and a voltage-conversion circuit all in one package, which simplifies the design of a portable device. PMICs are capable of both high and low voltage operations, enabling the device to efficiently control power within the system. To name a few of their capabilities, they can monitor a system\'s voltages and current, filter input signals, and switch sources as required.LED Drivers are one type of PMICs, which are primarily used to provide the electrical power for driving high-power light-emitting diodes (LEDs). LEDs, as one of the most energy-efficient lighting solutions, are, however, quite sensitive to current. Therefore, high-current stability is vital when it comes to driving the LED with a PMIC. Under the context, LED Drivers are designed to offer both low-level and high-level current stability.

PAM2842RGR Application Field and Working Principle

The PAM2842RGR is a single-channel LED Driver IC (VLD/DFIB) that is manufactured by the Taiwanese semiconductor company Richtek. The PAM2842RGR is made using Richtek’s proprietary DFIB (Digital Fidelity Interface and Biasing) architecture. The DFIB architecture integrates DMOS power devices and digital calibrators that allow the IC to accurately control the LED current by varying both VCC and RDS currents. Combined with the LED current monitoring feedback, the LED LED current regulation accuracy is greatly improved. The PAM2842RGR is designed primarily for LED applications, including backlight applications in both LCD and OLED displays. It can operate with input supply voltages from 2.5 V to 10 V, making it suitable for a wide range of battery-powered applications. The power switch’s maximum voltage rating is 30 V, and it can accommodate a maximum of 2.4 A current. The IC is also equipped with a three-stage dimming function, allowing for both dithering and PWMs. The three stages correspond to a 10:1 current ratio, providing a greater accuracy in the dimming effect. Furthermore, the output current can also be set via a common external resistor or digitally through its internal registers. Last but not least, Richtek also provides comprehensive protection features that include thermal protection, current protection, and overvoltage protection, making the PAM2842RGR particularly suitable for thermally sensitive applications. In conclusion, the PAM2842RGR is a single-channel LED Driver IC that is ideal for LCD and OLED backlighting applications. It offers superior LED current regulation accuracy thanks to its DFIB circuitry, coupled with comprehensive protection features for safety.

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