STOD32WJR

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PMIC - Voltage Regulators - Special Purpose

The STOD32WJR is a digitally programmable, non-isolated step-down regulator. It uses two-phase pulse width modulation to provide high efficiency at low output currents, and also improves stability for transient loads.

The STOD32WJR features an integrated over-current protection that works independently of the other protection features such as overvoltage, undervoltage, and over temperature protections. It has adjustable output voltage and is designed to operate at output currents of up to 5 amps. It is also suitable for applications that have high capacitive loads.

Applications

• Modems
• VoIP gateways
• Office automation equipment
• Industrial printers
• Computers
• Power supplies
• Motor drives

Working Principle

The STOD32WJR uses two-phase pulse-width modulation (PWM) control to provide high efficiency at low output currents and to improve stability for transient loads. The two-phase architecture provides several advantages over single-phase PWM regulators:

1. The output voltage is tracked more closely, providing higher accuracy.
2. The inductor ripple current is reduced, providing higher efficiency and better noise protection.
3. Ripple voltage is reduced over a wide range of output load currents, improving load regulation.
4. The two-phase architecture provides superior stability for transient loads.

The STOD32WJR features adjustable current-mode limits, enabling independent operation of the two phases and providing a wide range of control architectures. The adjustable limits prevent large excursions of the output voltage, resulting in improved line regulation. It also reduces output noise, improving the transient response of the regulator.

The adjustable over-current protection (OCP) protects against both continuous and transient overload conditions. The OCP is adjustable by an external resistor, enabling protection to be tailored to the specific application.

Conclusion

The STOD32WJR is a highly efficient, digitally programmable, step-down regulator. It can handle output currents of up to 5A and has integrated protection features that improve its line regulation, transient response, and overload protection. Its two-phase PWM architecture enables superior load regulation and stability for transient loads.

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