
Allicdata Part #: | UCC29421NG4-ND |
Manufacturer Part#: |
UCC29421NG4 |
Price: | $ 0.00 |
Product Category: | Integrated Circuits (ICs) |
Manufacturer: | Texas Instruments |
Short Description: | IC REG CTRLR MULT TOPOLOGY 16DIP |
More Detail: | Boost, Flyback, SEPIC Regulator Positive Output St... |
DataSheet: | ![]() |
Quantity: | 1000 |
1 +: | 0.00000 |
Frequency - Switching: | 150kHz ~ 1.2MHz |
Base Part Number: | UCC29421 |
Supplier Device Package: | 16-PDIP |
Package / Case: | 16-DIP (0.300", 7.62mm) |
Operating Temperature: | -40°C ~ 85°C (TA) |
Control Features: | Enable, Frequency Control, Low Battery, Reset |
Serial Interfaces: | -- |
Clock Sync: | Yes |
Synchronous Rectifier: | Yes |
Duty Cycle (Max): | 88% |
Series: | -- |
Voltage - Supply (Vcc/Vdd): | 1.8 V ~ 8 V |
Output Phases: | 1 |
Number of Outputs: | 1 |
Topology: | Boost, Flyback, SEPIC |
Output Configuration: | Positive |
Function: | Step-Up, Step-Up/Step-Down |
Output Type: | Transistor Driver |
Part Status: | Discontinued at Digi-Key |
Packaging: | Tube |
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The UCC29421NG4 is a high-performance non-synchronous buck controller with excellent control performance, wide voltage range and high power conversion ratio. It is designed to be used in a voltage-regulator power-supply circuit and provides reliable protection while maintaining dynamic response to a wide range of line, load and temperature conditions. UCC29421NG4 operates with high efficiency over a wide input voltage range and offers integrated low-side current sensing, fast loop-response and fast transient response.
Overview
UCC29421NG4 is a synchronous buck controller from Texas Instruments. It is a high-performance non-synchronous buck controller with excellent control performance, wide voltage range and high power conversion ratio. It is designed for use in small form factor, low noise and low power applications such as notebooks, PDAs, cellular phones and other computing devices.
UCC29421NG4 offers high efficiency operation over a wide input voltage range and offers integrated low-side current sensing, fast loop-response and fast transient response. Furthermore, it offers two options for the output voltage, either off or on. This makes it an ideal solution for easy-to-use and efficient power conversion.
Features
UCC29421NG4 offers the following features:
- Wide input voltage range (3.3 V to 16 V)
- Low quiescent current (less than 5 mA)
- Integrated low-side current sensing
- Fast loop-response
- Fast transient response
- Supports off voltage or on voltage output selection
- High loop-gain stability
- Thermal shutdown with hysteresis
- Fault protection circuits
Applications
UCC29421NG4 is suitable for various applications, including but not limited to: notebooks, PDAs, cellular phones, and other computing devices. Other applications include LED lighting drivers, special consumer products, etc.
Working Principle
UCC29421NG4 is a buck controller with integrated low-side current sensing. It is designed to control the output voltage by switching a buck PWM or pulse-width-modulated (PWM) power supply between an input and an output. The switched mode power supply operates by controlling the “on” time and “off” time of a power switch. By controlling the amount of time that the power switch is on and off, the output voltage can be controlled and regulated.
The UCC29421NG4 controller senses the current in the low-side MOSFET, conveniently located at the source of the main MOSFET switch, to derive a grounded source voltage as a measure of the average voltage across the drain and source pins. This voltage is measured using an internal voltage divider circuit.
UCC29421NG4 uses a hysteretic control loop for pulse-width modulation and current-sense circuit. A hysteretic loop monitors the voltage across the switch’s source and gate, and adjusts the PWM duty cycle through a low-pass filter and comparator.
UCC29421NG4 also monitors the temperature of the device and provides an additional temperature protection circuit to ensure safe operation in extreme environments.
Conclusion
UCC29421NG4 is a highly efficient, low power buck controller suitable for various applications and offers various integrated features for easy and efficient power conversion. It offers excellent control performance, wide voltage range and high power conversion ratio. With integrated low-side current sensing, fast loop-response and fast transient response, it is an ideal solution to provide reliable protection and maintain dynamic response to a wide range of line, load and temperature conditions.
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