JY Electronics has recently introduced the TL1304, a single-channel load switch chip featuring ultra-low resistance and fast rise time. This product includes an N-channel MOSFET that operates within an input voltage range of 0.8V to 5V and supports a maximum continuous current of 4.5A. It can be widely applied in laptops, tablets, smartphones, PC motherboards, POS machines, handheld devices (GPS navigators and e-readers), set-top boxes, USB ports/hubs, automotive audio systems, and navigation devices. The product has passed high and low-temperature environmental tests, and the engineering batch has been verified.
Highlights of the TL1304 Product:
1、Compact and Space-Saving Package: The TL1304 is housed in a small SOT23-6L package with an integrated heat sink, enabling high power dissipation.
2、Wide Input Voltage Range: The switch input voltage VIN ranges from 0.8V to 5.5V, and the input bias voltage VBIAS ranges from 3V to 5.5V.
3、Low On-Resistance: At VIN = 1.05V (VBIAS = 3.3V to 5.5V), the on-resistance RON is 20mΩ, supporting a maximum continuous current of 4.5A.
4、Low Quiescent and Shutdown Currents: The device features low quiescent current (20μA at VBIAS = 5V) and low shutdown current (1μA at VBIAS = 5V).
5、Fast Output Discharge Capability: The TL1304 includes a fast output discharge function.
6、Undervoltage Protection and Enable Control: The chip offers undervoltage protection and enable control features.
7、Wide Operating Temperature Range: The TL1304 can operate normally within a temperature range of -40°C to +85°C.
Application Example: Laptops
A load switch is an integrated circuit used to turn power on and off. When enabled through the ON pin, the switch closes, allowing current to flow from the input pin to the output pin and delivering power to downstream circuits.
In laptops, load switches are commonly used in power management modules to achieve precise voltage regulation, current distribution control, and power switching operations. These functions enable laptops to efficiently manage power supply from batteries and external sources, ensuring efficient operation in various working modes. For example, in scenarios such as USB-C charging, DCIN charging, and power delivery through USB Type-A ports, load switches play a crucial role in power management.
Time Testing (VIN = 1.05V; VON = VBIAS = 3.3V; TA = 25°C; RL = 10Ω; CL = 0.1uF)
CH1:VON CH2:VOUT
Time (20μs/div)
TD+TR=17.5μs
CH1:VON CH2:VOUT
Time (50μs/div)
TOFF=2.4μs
CH1:VON CH2:VOUT
Time (20μs/div)
TF=1.91μs
Load switch chips are integrated solutions that implement load switch functionality. Compared to load switches built from discrete circuits, load switch chips offer higher integration levels. They simplify circuit design, reduce the PCB area occupied by components, and can achieve functions that are difficult to implement with discrete circuits.
