In today's diversified electronic equipment power supply system, a high-efficiency boost converter that can adapt to wide input voltage and has flexible current protection function is particularly important. The CXSU63310 is designed for this kind of demand. It integrates 80mΩ low-resistance MOSFET, supports wide input voltage from 2.2V to 16V, and has programmable overcurrent protection function. It is suitable for battery-powered equipment, network equipment, LCD bias system and other application scenarios. This article will comprehensively analyze the technical characteristics, working principles and design practices of the CXSU63310 to help engineers build a more robust and efficient power architecture.
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[ CXSU63310 ]"
CXSU63310: Wide Input Range, Adjustable Current Limit High Efficiency Boost Converter Depth Analysis
In today's diversified electronic equipment power supply system, a high-efficiency boost converter that can adapt to wide input voltage and has flexible current protection function is particularly important. The CXSU63310 is designed for this kind of demand. It integrates 80mΩ low-resistance MOSFET, supports wide input voltage from 2.2V to 16V, and has programmable overcurrent protection function. It is suitable for battery-powered equipment, network equipment, LCD bias system and other application scenarios. This article will comprehensively analyze the technical characteristics, working principles and design practices of the CXSU63310 to help engineers build a more robust and efficient power architecture.
1. CXSU63310 Product Core Features
The CXSU63310 is a fixed-frequency, peak-current-controlled boost converter in a 6-pin SOT23-6 package that delivers high-performance power conversion in a compact volume:
· Wide input voltage range: 2.2V-16V, compatible with a variety of power input
· High efficiency conversionUp to 93% efficiency, support light-load PFM mode
· Adjustable overcurrent protection: Set the current limiting point of 0.5A-2.5A through external resistor
· High degree of integrationBuilt-in 80mΩ MOSFET, soft start, OVP, UVLO and thermal protection
· Fixed switching frequency: 1.2MHz, support small size inductor and capacitor
Output voltage up to 20VTo meet the needs of medium and high voltage applications
2. typical application areas
The CXSU63310 is suitable for a variety of low and medium power boost scenarios, especially:
· Battery-Powered Portable Devices: such as handheld instruments, mobile terminals
· Network and Communication EquipmentDSL/cable modem, router, PCIe power supply network card
· Display System BiasLCD display bias power supply
· Industrial and Consumer Electronics: All kinds of occasions that need to be boosted from 5V/12V system to higher voltage
3. electrical characteristics and performance
Under typical conditions of VIN = 5V and TA = 25°C, the CXSU63310 key parameters are as follows:
· Feedback reference voltage: 0.6V (typical)
· Quiescent currentPFM mode about 100 μA,PWM mode about 1.6mA
· Switch on-resistance: 80mΩ (typical)
· Internal current limit value: 2.5A when OC pin is floating
· Overvoltage protection threshold：20V
· Thermal shutdown temperature: 160 ℃, with 25 ℃ hysteresis
The efficiency curve shows that under the conditions of 5V output and 3.7V input, the efficiency of the load current remains above 90% in the range of 0.5 A- 1A, which is an excellent performance.
4. functional architecture and working principle
The CXSU63310 adopts the peak current control architecture, the MOSFET is turned on in each oscillation cycle, and the turn-off time is controlled by the comparison of the current detection and the error amplifier, so as to realize the stable adjustment of the output voltage. The system has built-in slope compensation to prevent sub-harmonic oscillations when the duty cycle exceeds 50%.
Its uniqueness lies inProgrammable Overcurrent Protection (OC Pin), through the external resistor (19kΩ-96kΩ) can accurately set the current limiting point of 0.5A-2.5A, adapt to different load and inductor selection requirements, and improve the flexibility of system design.
5. Application Design Guide
1. Output voltage setting
The output voltage is set by voltage divider resistors R1, R2 connected to the FB pin:
2. Overcurrent protection resistor configuration
The relationship between the external resistor R3 of OC pin and the current limit value is:
R3 takes a value of 19kΩ-96kΩ, corresponding to a current limiting range of 2.5A-0.5A.
3. Inductor Selection
It is recommended that 4.7 μH-22 μH power inductors should have low DCR, high saturation current and low core loss characteristics suitable for 1.2MHz.
4. Capacitor selection
A 22 μF ceramic capacitor is recommended for input and output, preferably X5R/X7R, whose low ESR helps reduce ripple.
5. Diode selection
It is recommended to use Schottky diode, its low forward voltage drop and fast recovery characteristics are beneficial to improve efficiency. The withstand voltage of the diode shall be higher than the output voltage, and the current capacity shall meet the following requirements:
6. PCB Layout Recommendations
· The input and output capacitors are close to the chip and connected to the full ground plane
· High current path is short and wide, reducing conduction loss and noise
· Compact layout of SW nodes to suppress high-frequency noise radiation
· The feedback network is located away from the switch node and close to the FB pin
6. Encapsulation Information
CXSU63310 in a SOT23-6 package, compact size, clear pin definition, support for automated placement and standardized soldering process, easy to integrate into high-density PCB design.
7. Related Productsmore...
Eight,About JTM-IC
JTM-IC (official website:jtm-ic.com) Committed to providing efficient and reliable power management solutions to customers worldwide. CXSU63310 is our high-performance boost converter for wide input voltage and adjustable current limit for a wide range of network, industrial and consumer devices. We provide complete technical documentation, reference design and application support, welcome to visit the official website for more product information, application samples or contact technical support.
