UCC2806D

Frequency - Switching:	47kHz
Base Part Number:	UCC2806
Supplier Device Package:	16-SOIC
Package / Case:	16-SOIC (0.154", 3.90mm Width)
Operating Temperature:	-40°C ~ 85°C (TA)
Control Features:	Current Limit, Enable, Frequency Control
Serial Interfaces:	--
Clock Sync:	No
Synchronous Rectifier:	Yes
Duty Cycle (Max):	50%
Series:	--
Voltage - Supply (Vcc/Vdd):	8 V ~ 14.5 V
Output Phases:	1
Number of Outputs:	2
Topology:	Boost, Flyback, Forward Converter
Output Configuration:	Positive, Isolation Capable
Function:	Step-Up, Step-Up/Step-Down
Output Type:	Transistor Driver
Part Status:	Active
Packaging:	Tube

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UCC2806D Application Field and Working Principle

UCC2806D belongs to DC-DC Switching Charge Controllers. The UCC2806D is a Monolithic Switching Charge Controller with a working output of up to 4 A and an adjustable peak current operating frequency from 200kHz to 600kHz. It is designed to reduce the cost and complexity of a two-stage, two inductor buck-boost power management circuit.

UCC2806D Features

The UCC2806D DC-DC Switching Charge Controllers has a variety of features that makes it an ideal solution for many applications. It is designed to save board space, cost and simplify two-stage, two-inductor buck-boost power management circuits. The integrated controller offers the flexibility of an adjustable operating frequency, dynamic voltage scaling and built-in protection, such as over-temperature, over-current and under-voltage protection. Additionally, the UCC2806D has a cycle-by-cycle current limit feature which prevents the controller from drawing excessive power from the input power source and ensures a reliable, low-cost switching regulator solution.

UCC2806D Application Fields

UCC2806D DC-DC Switching Charge Controllers are useful in a variety of applications, including portable battery-powered devices, and power supplies for communications and consumer electronics. The UCC2806D is ideal for applications that require a reliable, high-efficiency bipolar switching charge controller in a low-cost solution. The peak current operating frequency can be adjusted to meet the requirements of different applications.

UCC2806D Working Principle

The UCC2806D has two operation modes, a buck-boost mode and a high-side buck mode. The operation mode is selected based on the difference in voltage levels between the input terminals of the controller. The buck-boost mode operates when the input voltage is greater than the output voltage and the high-side buck mode operates when the input voltage is lower than the output voltage. In both modes, the UCC2806D uses an internal comparator and an external reference voltage to control the output voltage. Specifically, when the output voltage falls below the reference voltage, the internal comparator triggers a PWM output. This PWM output turns on the commutated pass NMOS transistor which switch current from the input to the output. The maximum on-times for the NMOS are determined by the average current contained in the voltage feedback loop. The peak current operating frequency can be adjusted from 200kHz to 600kHz, allowing for an efficient switching solution for different applications. Additionally, the UCC2806D features a dynamic voltage scaling which provides the flexibility to lower the voltage output when needed. The UCC2806D also has a built-in protection feature which limit the power drawn from the input source. When the output current of the controller exceeds the preset value, the internal current limit circuit senses this and shuts off the PWM output of the controller. This prevents the controller from drawing excessive power from the input source.

Conclusion

The UCC2806D DC-DC Switching Charge Controllers is an ideal solution for applications that require a reliable, high-efficiency bipolar charge controller in a low cost solution. It is designed to reduce cost and complexity of a two-stage, two-inductor buck-boost power management circuit, while offering the flexibility of an adjustable operating frequency, dynamic voltage scaling and built-in protection. Additionally, the UCC2806D has a cycle-by-cycle current limit feature which prevents the controller from drawing excessive power from the input power source, further ensuring a reliable, low-cost switching regulator solution.

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