With the rapid development of fast charging technology, power management chips that support high-power and multi-protocol become the core requirements of electronic devices. As a digital power chip integrating synchronous four-switch buck-boost controller and USB PD3.0 protocol, CXSU63304 provides high-performance solutions for mobile power supplies, car chargers, electric tools and other equipment with 100W output capability, 13-90V wide voltage input and multiple safety protections.
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[ CXSU63304 ]"
Introduction
With the rapid development of fast charging technology, power management chips that support high-power and multi-protocol become the core requirements of electronic devices.CXSU63304As a digital power chip integrating synchronous four-switch buck-boost controller and USB PD3.0 protocol, it provides high-performance solutions for mobile power supplies, car chargers, electric tools and other equipment with 100W output capability, 13-90V wide voltage input and multiple safety protections.
1. core features: efficient and flexible fast charging engine
1. PD3.0 protocol is fully compatible
B. automatic identification of E-Mark cables, dynamic broadcast 3A/5A current capability, to ensure that the wire safety matching 100W output.
C. built-in USB Type-C interface logic and BMC communication module, simplify the Source device design.
2. Four-switch buck-boost architecture
B. Intelligent voltage regulation: 3.3 V-21V output range, support CC/CV mode and line loss compensation, conversion efficiency up to 94.5%.
c. Seamless switching: When the input voltage is higher than, lower than or equal to the output voltage, it can work stably.
3. Six-weight safety protection
c. Integrated MOSFET drive blocking function to eliminate the risk of upper and lower tube straight through.
| Type of protection | Trigger Threshold | Recovery Threshold |
|---|---|---|
| Input undervoltage protection | 0.40V | 0.43V |
| Input overvoltage protection | 2.94V | 2.78V |
| over-temperature protection | 90 ℃ | 80 ℃ |
2. technology advantages: precise control and easy to use design
1. Power switch intelligent management
a. Buck mode(VIN > VOUT):MOS tube Q3/Q4 is fixed on, and Q1/Q2 is regulated by PWM.
B. Boost mode(VOUT > VIN):Q1/Q2 is fixed on, Q3/Q4 is controlled by PWM.
c. Four-tube synchronous freewheeling topology significantly reduces power consumption and improves efficiency.
2. Constant current and overcurrent protection
A. current sampling is amplified by 21.4 times by differential operational amplifier and then input to ADC to realize accurate constant current control (formula:V=0.94 0.107*I）。
B. Over-current protection threshold 10A, quick cut-off output to ensure safety.
3. Dynamic configuration of power supply capabilityByHRPPin calibration pull-up resistor, flexible switching power supply capability:
A.36kH: Default USB powered
b.12kΩCapability: 1.5A
c.4.7kΩ: 3A capacity
4. VCONN Intelligent AllocationAutomatically detect CC1/CC2 channel, drive external MOS tube to provide VCONN power for E-Mark cable.
3. typical application scenariosThe CXSU63304 is widely used for Source devices that require high reliability power supply:
1. Portable equipmentMobile power supply, mobile phone/tablet fast charging head.
2. On-board systemCar charger (12V/24V/48V battery).
3. Power toolsLithium battery power tools, garden equipment.
4. Industrial EquipmentPower supply module for small household appliances and IoT devices.
Design Reference: Figure 6-1 provides a typical circuit for 13-90V input to 20V/5A output, integrating voltage feedback (VFB_VIN), current detection (IFB_VBUS) and temperature monitoring (TFB).
4. Encapsulation and Electrical Parameters
1. Encapsulation: LQFP64 (size 12 × 12mm), supporting industrial temperature (-40 ℃ ~ 105 ℃).
2. Electrical characteristics：
a. Driver power supply VDD12:10-18V (quiescent current 1mA)
B. Chip power supply VDD3/VDDA:3.3V ± 10% (quiescent current 5mA)
c.PWM frequency: 100kHz
Five. Application Design
1 Power switch control
Figure 8-1 shows a simplified schematic of how the four power switches are connected to the inductor, VIN, VOUT, and GND. CXSU63304 according to the VIN and
The size of VOUT and the size of the load automatically operate in buck mode or boost mode. The upper and lower tube PWM complementary to achieve synchronous freewheeling.
When VIN is higher than VOUT, the chip operates in buck mode. During voltage reduction, MOS tube Q3 and MOS tube Q4 have fixed output. MOS tube Q2,Q1
The duty cycle is controlled by the voltage current loop. When VOUT is higher than VIN, the chip operates in boost mode. When boosting, MOS tube Q1 and MOS tube Q2
Fixed output; duty cycle of MOS tube Q4,Q3 is controlled by voltage and current loop.
The principle of constant current output is shown in Figure 8-2:
The first step is to calculate the DC offset:
The second step is to calculate the magnification of the operational amplifier: A =(R35//R34)/R44
The third step, calculate the output voltage:
From the above formula, the amplification factor of the op amp is 21.4 times. When the current flowing through the sampling resistor RS is 1A, the sampling resistor
The voltage difference between the two ends is 5mV. After being amplified by 21.4 times by a differential operational amplifier, it is input to the internal ADC pin of the CXSU63304, and its voltage amplitude is
Offset Vout = 0.94V 0.107V = 1.047V, and then adjust PWM after internal circuit error calculation to control current output.
The principle of output overcurrent protection, the circuit structure is shown in Figure 8-2:
According to the formula 1 and formula 2 in the constant current output principle, it can be seen that the relationship between the output current and the voltage is: V = 0.94 0.107 * I (formula 3)
When the voltage at CXAR41214 pin 6 is greater than the voltage at pin 5, overcurrent protection is triggered. The overcurrent protection threshold is about 10A.
3 Input voltage feedback
The CXSU63304 has an input voltage detection control unit to achieve overvoltage and undervoltage detection of the input voltage. Input undervoltage threshold is 0.40V;
The input undervoltage recovery threshold is 0.43V. The input overvoltage threshold is 2.94V; the input overvoltage recovery threshold is 2.78V.
When the input voltage is lower than 13V, the input undervoltage protection is triggered, thus turning off the VBUS voltage output. When the input voltage returns to above 14V, it will resume
Complex VBUS 5V voltage output.
When the input voltage is higher than 95V, the input overvoltage protection is triggered to turn off the VBUS voltage output. When the input voltage returns to below 90V,
Restore VBUS 5V voltage output.
4 Temperature feedback
CXSU63304 support over-temperature protection. The over-temperature protection threshold is 90 ℃. Over-temperature recovery threshold 80 ℃. When the PCB ambient temperature exceeds 90 ℃, trigger
over-temperature protection, which turns off the VBUS voltage output. When the ambient temperature drops below 80 ℃, exit the over-temperature protection and restore the VBUS 5V voltage output.
5 Power Capability Selection
The pull-up resistor is CXSU63304 calibrated via pin HRP. Different pull-up resistors represent different power supply capabilities.
Table 8-1. Power Supply Capability
6 VCONN Control
After the CXSU63304 detects that the device or E-Mark cable is connected, it automatically selects CC1 or CC2 as the data communication pin. When CC1 acts
When the data communication pin, the pin ENCC2 will output a low level to drive the external MOS transistor to output the VCONN power supply. When CC2 is used as data communication
pin ENCC1 will output a low level to drive the external MOS transistor to output the VCONN power supply.
Conclusion
CXSU63304Full-protocol fast charge support, wide-pressure buck-boost control, multiple protection mechanismsAs the core competitiveness, it helps developers to quickly realize high-performance Type-C power solutions. Its digital architecture (supporting UART/SWCLK upgrade interface) further simplifies the debugging process, suitable for consumer electronics, industrial equipment and emerging energy storage.
Technical Specification (Product PDF)Download resourcesPackage size (LQFP64), typical application circuit and pin definition are detailed in the technical document.
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Product packaging diagram
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