AS1372-BWLT-13

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Overview

The AS1372-BWLT-13 is a dual supply rail linear regulator designed for ultra-low voltage applications. It provides a fixed output of 1.3V with a maximum output current of 350mA. The device operates with an input voltage range of 0.7V to 4.5V and a bias supply voltage of 2.5V to 5.5V. Output voltage accuracy is ±1.5% at nominal conditions. Dropout voltage is 135mV at 350mA load. Quiescent current is typically 10nA in shutdown mode. Power-supply rejection ratio exceeds 80dB from 10Hz to 1kHz. Noise voltage is 50µVRMS from 10Hz to 1000kHz. Operating temperature range is -40°C to +85°C. Package is 5-bumps CS-WLP.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Feature Summary

• Dual supply architecture utilizing separate VIN and VBIAS pins to optimize efficiency and dropout performance at low output voltages.
• Integrated chip enable input with internal pull-down resistor and extremely low shutdown current.
• Robust protection mechanisms including thermal shutdown, overcurrent limiting, and under-voltage lockout.
• High power-supply rejection ratio and low noise characteristics suitable for sensitive analog circuits.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Applications

• Cordless and mobile phones
• MP3 players and PDAs
• Hand-held computers and digital cameras
• Battery-powered devices requiring ultra-low voltages

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Procurement Notes

Verify the specific ordering code AS1372-BWLT-13 against official manufacturer documentation to confirm the 1.3V fixed output specification. Ensure compatibility with the required 5-bumps CS-WLP package dimensions and pin assignments. Confirm that the application environment falls within the specified operating temperature range of -40°C to +85°C. Check for any recent product discontinuation notices or alternative sourcing options if availability is constrained.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Selection Notes

Select this component when designing systems that require precise low-voltage regulation with minimal quiescent current consumption. The dual-rail design is particularly advantageous for battery-operated devices where maximizing efficiency at light loads is critical. Consider the package size constraints as the 5-bumps CS-WLP offers a compact footprint. Ensure the external capacitors meet the ESR requirements for stability across the full load and temperature range.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Part Context

The AS1372 belongs to a family of dual supply rail linear regulators manufactured by ams OSRAM (formerly austriamicrosystems). These devices are engineered to address the limitations of traditional single-supply LDOs at very low output voltages. By decoupling the pass transistor supply from the core circuitry, they achieve superior transient response and efficiency. This specific model represents a standard fixed-output variant within the series.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Replacement Considerations

Direct substitutes include other models from the AS1372 series with different fixed output voltages, such as AS1372-BWLT-12 (1.2V) or AS1372-BWLT-15 (1.5V), provided the system voltage requirements can be adjusted. Verify pin-to-pin compatibility and electrical parameter alignment before substitution.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators FAQ

What is the function of the VBIAS pin?

The VBIAS pin provides a dedicated bias supply voltage (2.5V to 5.5V) for the internal circuitry and the NMOS pass transistor gate drive. This allows the drain-source voltage of the pass transistor to be minimized independently of the core logic supply, improving efficiency and reducing dropout voltage.

How does the dual supply architecture improve performance?

The dual supply approach uses an NMOS pass transistor in a common-drain configuration. This allows the input voltage (VIN) to track closely with the output voltage while the bias supply (VBIAS) powers the control loop. This results in lower dropout voltage, higher efficiency at low output voltages, and faster load transient response compared to traditional PMOS-based single-supply LDOs.