S-8338ACCC-T8T1G

Overview

The S-8338ACCC-T8T1G is a CMOS step-up switching regulator controller from the S-8338 series, manufactured by ABLIC Inc. It operates within an input voltage range of 1.8 V to 6 V and utilizes pulse width modulation (PWM) control with a fixed maximum duty ratio of 88%. The internal oscillation frequency is adjustable up to 1.133 MHz via an external resistor on the ROSC pin. Phase compensation and gain are configurable through external components connected to the CC pin. The device integrates an error amplifier, under-voltage lockout circuit, and timer latch short-circuit protection. It is housed in an 8-pin TSSOP package.

Feature Summary

• Integrates a reference voltage circuit, oscillator, error amplifier, PWM controller, UVLO, and short-circuit protection.
• Features a low minimum operating voltage suitable for portable systems and LCD power supplies.
• Allows user-adjustable internal oscillation frequency up to 1.133 MHz via an external resistor.

Applications

• Power supply for liquid crystal displays (LCDs)
• Portable electronic systems requiring low voltage operation
• Step-up DC-DC converter designs

Procurement Notes

Verify the specific suffix 'T8T1G' against the manufacturer's official documentation to confirm the exact tape-and-reel packaging configuration and marking codes. Ensure that the ordering information matches the current revision level specified in the datasheet, as product change notifications may affect material composition or physical dimensions without altering electrical performance.

Selection Notes

Select this component when a fixed maximum duty ratio of approximately 88% is required for boost applications. Unlike the S-8337 series, the S-8338 does not allow external adjustment of the maximum duty cycle via an RDuty pin. Designers must account for the fixed duty limit when calculating output voltage ranges and ensure that the external ROSC resistor sets the desired switching frequency within the supported range.

Part Context

This part belongs to the S-8337/8338 series of high-frequency PWM control switching regulator controllers. The series is designed for CMOS technology to support low-voltage operation starting at 1.8 V. While the S-8337 allows variable maximum duty ratios, the S-8338 variant fixes this parameter, simplifying the external component count for specific boost converter topologies where the duty cycle limit is acceptable.

Replacement Considerations

S-8338ABEB-T8T1G

FAQ

How is the switching frequency determined?

The internal oscillation frequency is set externally by connecting a resistor to the ROSC pin, allowing frequencies up to 1.133 MHz.

What distinguishes the S-8338 from the S-8337 series?

The S-8338 has a fixed maximum duty ratio, whereas the S-8337 series allows the maximum duty ratio to be controlled by an external resistor connected to the RDuty pin.