Efficient and reliable power management chips are the core driving force in fields such as electric vehicle controllers, industrial systems, and fast charging equipment. CXSD62674H, as a high-performance buck DC-DC chip, is becoming an ideal choice for engineers to deal with complex power supply scenarios due to its wide input range of 10-120V, 1.5A output current, and zero power shutdown technology. This article will delve into its characteristics, design points, and typical application solutions.
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[ CXSD62674 ]"
Innovate the design of wide voltage power supply! CXSD62674H buck chip analysis: an efficient, compact, and zero power industrial grade solution
Efficient and reliable power management chips are the core driving force in fields such as electric vehicle controllers, industrial systems, and fast charging equipment.CXSD62674HAs a high-performance buck DC-DC chip, relying on10-120V ultra wide input rangeThe1.5A output currentandZero power shutdown technologyIt is becoming an ideal choice for engineers to deal with complex power supply scenarios. This article will delve into its characteristics, design points, and typical application solutions.
1、 Core advantages: high performance and high reliability
1. Minimalist design to reduce costs
a. Integrating power MOS transistors, streamlining peripheral circuits, significantly reducing BOM costs and PCB area.
b. The ESOP8 package combines heat dissipation and compact layout, making it suitable for space constrained scenarios such as balance car controllers.
2. Wide voltage input and flexible output
a. Input voltage coverage10V to 120VAdapt to battery power fluctuations (such as electric vehicle 48V system).
b. Free setting of output voltage through FB pin resistor division (formula:Vout=(1+R1/R2)× 1.25V）Supports commonly used voltages such as 5V/12V (Figure 6-2, 6-3).
3. Multiple protection mechanisms
a. Triple protection of cycle by cycle current limiting, output short-circuit protection, and 155 ℃ overheating protection ensures system robustness.
b. Input voltage withstand up to 120V, ESD protection up to 2KV (HBM), strong anti-interference ability.
2、 Breakthrough technology: zero power standby
1. EN enable pin control（High level>2.8V on, low level<1V off) to achieve complete shutdown, standby current≤10μ A,Significantly extend the battery life of battery devices (such as instrument power)
2. Typical application circuit (Figure 6-1) shows the button enable design, which can wake up the system without additional power consumption.
3、 Key Design Guidelines
1. Inductance selection
a. The working mode is determined by the inductance value: discontinuous mode (DCM) under light load and continuous mode (CCM) under heavy load.b.L =[(Vin-Vout)×D]/(Fs×ΔIL)Calculation formula: Calculate（Fs=110kHz, Δ ILSuggestion: 30% output current.
2. Optimization of capacitors and diodes
a. Output capacitorSelect low ESR capacitors, ripple formula:Δ Vo=Δ IL× (ESR+1/(8.5×Fs ×Co))
b. Freewheeling diodePrioritize Schottky diodes to reduce conduction voltage loss and improve efficiency.
3. Key points of PCB layout
a. The input capacitor and bootstrap capacitor (VB-VS) are tightly attached to the chip pins;
b. The high current path (VIN/GND/VS/IS) adopts short and wide wiring;
c. The back of the chip is extensively covered with copper to enhance heat dissipation (supporting full load 1.5A output).
4、 Typical application scenarios
| field | Solution Value |
|---|---|
| Electric vehicle controller | Wide voltage adaptability to battery fluctuations, high temperature resistance design |
| Fast charging power supply | 12V/5V multi output (Figure 6-4) |
| industrial control system | Short circuit protection prevents motor stalling and damage |
| Twisting car/balance car | Compact ESOP8 package saves space |
5、 Detailed explanation of electrical characteristics
1. Prioritize efficiencyStatic current is only 2mA (EN on), conversion efficiency>90% (typical value).
2. Precise controlFB feedback voltage 1.25V± 3.2%, current limiting threshold 0.18V, ensuring output stability.
3. Environmental adaptabilityWorking temperature -45 ℃~125 ℃, supporting industrial grade environment.
Conclusion
CXSD62674H passedHigh integration, ultra wide voltage input, and intelligent protectionSolved the pain points of power management for battery powered equipment and industrial systems. Its zero power consumption characteristics are particularly suitable for new energy vehicles and portable devices, providing a benchmark solution for efficient, compact, and highly reliable design. Engineers can refer to the typical circuits in the specification sheet (Figures 6-1 to 6-4) for rapid deployment, significantly reducing the development cycle.
Technical Specifications (Product PDF);Extension TipsIn the fast charging scheme (Figure 6-4), it is recommended to use synchronous rectification technology to further optimize efficiency; In high-temperature scenarios, it is necessary to ensure that the PCB heat dissipation design complies with the layout specifications in Section 8.1.
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Selection Guide for Related Chips; More related products .....
| model | VCC startup voltage | VCC shutdown voltage | Input voltage range | starting current | switching frequency | Output voltage accuracy | Built in power transistor | feature | encapsulation |
| CXDC65167 | 6.5V | 3.5V | 20-60V | Built in quick start | 10-100K， Peripheral can be set | 3% | have | 48V battery power supply system step-down switch power supply chip | ESOP8 |
| CXAC85204 | 16V | 9V | 20-150V | 3uA | frequency jitter | 1.5% | have | Non isolated system constant voltage and constant current output | SOP7 |
| CXAC85207 | 9.5V | 7.8V | 10-25V | 80uA | 0-300K, Peripheral adjustable | 1.50% | none | Programmable power chip | SOP16 |
| CXLB73135 | 9.5V | 7.8V | 10-25V | 80uA | 0-300K, Peripheral adjustable | 1.50% | none | Programmable power chip | SSOP24 |
| CXDC65168 | 6.5V | 3.5V | 10-600V | 200uA | 0-300K， Peripheral can be set | 1.5% | none | Synchronous rectification, highefficiencyCan support constant current and constant voltage charging of batteries | SOP16 |
| CXSU63303 | - | - | 7-150V | External auxiliary power supply | 70K | 1.5% | none | Voltage regulator control chip, supporting high-voltage and high current protection solutions | QFN32 |
| CXSU63304 | - | - | 13-90V | External auxiliary power supply | 100K | 1.5% | none | Digital power supply chip supporting PD3.0 protocol for voltage regulation | QFN64 |
| CXSU63305 | 3.65V | 3.6V | 4-600V | 50uA | 0-300K， Peripheral can be set | 1.5% | none | Boost synchronous rectification scheme, supporting high voltage and high current schemes | SOP16 |
| CXSD62669 | 16V | 9V | 20-90V | 3uA | frequency jitter | 1.5% | have | Non isolated system constant voltage and constant current output | SOP7 |
| CXSD62670 | 16V | 9V | 20-600V | 3uA | frequency jitter | 1.5% | have | Non isolated system constant voltage and constant current output | SOP7 |
| CXSD62671 | - | - | 10-115V | Built in quick start | 140KHz | 3% | none | Short circuit hiccup, flexible and adjustable output voltage | ESOP8 |
| CXSD62672 | - | - | 10-115V | Built in quick start | 120KHz | 3% | none | Short circuit locking, flexible and adjustable output voltage | ESOP8 |
| CXSD62673 | - | - | 10-100V | Built in quick start | 120KHz | 3% | have | Zero power consumption enabled, flexible and adjustable output voltage | ESOP8 |
| CXSD62674 | - | - | 10-120V | Built in quick start | 120KHz | 3% | have | Zero power consumption enabled, flexible and adjustable output voltage | ESOP8 |
| CXSD62675 | - | - | 10-120V | Built in quick start | 120KHz | 3% | have | Short circuit hiccup, flexible and adjustable output voltage | ESOP8 |
| CXSD62676 | - | - | 10-120V | Built in quick start | 120KHz | 3% | none | Short circuit hiccup, flexible and adjustable output voltage | ESOP8 |
| CXSD62677 | - | - | 10-120V | Built in quick start | 70KHz | 3% | none | Short circuit locking, flexible and adjustable output voltage | ESOP8 |
| CXSD62678 | 4.6V | 3.8V | 4-600V | 50uA | 0-300K， Peripheral can be set | 1.5% | none | Voltage reduction synchronous rectification scheme, supporting high voltage and high current schemes | SOP16 |
| CXSD62679 | 16.5V | 8V | 10-600V | 200uA | 0-300K， Peripheral can be set | 1.5% | none | Synchronous rectification, highefficiencyCan support constant current and constant voltage charging of batteries | SOP16 |
| CXSD62680 | 8.5V | 7.5V | 10-600V | 200uA | 0-300K， Peripheral can be set | 1.5% | none | Synchronous rectification, highefficiencyCan support constant current and constant voltage charging of batteries | SOP16 |
| CXSD62681 | 9.5V | 7.8V | 11-250V | 200uA | 0-300K， Peripheral can be set | 1.5% | none | Synchronous rectification, highefficiencyShort circuit locking, built-in temperature protection, etc | SSOP16 |
| CXSD62682 | 9.5V | 7.8V | 11-100V | 200uA | 0-300K， Peripheral can be set | 1.5% | have | Synchronous rectification, highefficiencyShort circuit locking, built-in temperature protection, etc | QFN32 |
| CXSD62683 | 9.5V | 7.8V | 11-30V | 200uA | 0-300K， Peripheral can be set | 1.5% | have | Synchronous rectification, highefficiencyShort circuit locking, built-in temperature protection, etc | QFN32 |
| CXSD62684 | - | - | - | External auxiliary power supply | Maximum operating frequency 100KHz | - | none | Digital algorithm current mode synchronous voltage reduction control chip | SSOP24 |
| CXSD62685 | 9.5V | 7.8V | 10-25V | 80uA | 0-300K, Peripheral adjustable | 1.50% | none | Synchronous rectification step-down power supply control chip | SSOP16 |
