Executive Summary
The S-8340/8341 Series from Seiko Instruments Inc. comprises CMOS step-up switching regulator controllers with a high oscillation frequency of 300 kHz or 600 kHz, designed to facilitate the creation of highly efficient step-up switching regulators suitable for portable devices.
Key Features
Oscillation Frequency: Options include 600 kHz for A and B types, and 300 kHz for C and D types.
Output Voltage: Fixed types are selectable in increments of 0.1 V between 2.5 to 6.0 V, with an accuracy of ±2.0%, while the FB (feedback) type is adjustable.
Duty Ratio: Ranges from 0 to 82% for PWM control in the S-8340 Series, and 27 to 82% for PWM or PWM/PFM switching control in S-8341 Series A and B types, and 21 to 82% for S-8341 Series C and D types.
Low-Voltage Operation: Ensures oscillation starts with a VoD as low as 0.9 V.
Protection and Control: Features current limit, soft-start, and shutdown functions for device security and power management.
Applications
Intended primarily for power supplies in portable equipment such as PDAs, electronic notebooks, and cellular phones, the S-8340/8341 Series is also suited for audio equipment, computer peripherals, and constant voltage power supplies in imaging devices.
Design Ease
Designers can easily implement the S-8340/8341 controllers into systems due to minimal external part requirements, including a coil, diode, capacitors, transistor, and resistor. The 8-Pin TSSOP package allows for compact and versatile designs.
Circuit Efficiency
The S-8340 Series boasts a high-dutycycle PWM control circuit that achieves low ripple and high efficiency. The S-8341 Series adds a PWM/PFM switching control circuit that adapts duty cycles for efficiency across all load ranges.
Diagrams and Package Details
Block diagrams are provided for each type, illustrating the internal circuitry including the oscillation, phase compensation, error amplifier, and PWM/PFM switching control circuits. Package details are specified as the FTO08-A for the component, with tape and reel information under the code FTo08-E and FT008-E, respectively.
The datasheet emphasizes the flexibility and efficiency of these regulation controllers, making them suitable for a broad range of applications that require robust power management in a compact form factor.
References:
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