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S-8340D25AFT-T2-U Datasheet(PDF) 1 Page - Seiko Instruments Inc |
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S-8340D25AFT-T2-U Datasheet(HTML) 1 Page - Seiko Instruments Inc |
1 / 55 page S-8340/8341 Series www.sii-ic.com STEP-UP, 600 kHz, PWM CONTROL OR PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER © SII Semiconductor Corporation, 1999-2010 Rev.4.0_01 1 The S-8340/8341 Series is a CMOS step-up switching regulator controller which mainly consists of a reference voltage source, oscillation circuit, error amplifier, phase compensation circuit, PWM control circuit (S-8340 Series), and PWM/PFM switching control circuit (S-8341 Series). Since the oscillation frequency is a high 300 kHz or 600 kHz, with the addition of a small external part, the S-8340/8341 Series functions as a highly efficient step-up switching regulator with a high output current. The speed of the output stage is enhanced so that the N-channel power MOS with a low on-resistance can be switched quickly. The S-8340 Series realizes low ripple, high efficiency, and excellent transient characteristics thanks to a PMW control circuit capable of varying the duty ratio linearly from 0 to 82%, optimized error amplifier, and phase compensation circuit. The S-8341 Series contains a PWM/PFM switching control circuit so that it operates using PWM control with a duty ratio of 27% or higher and using PFM control with a duty ratio of lower than 27% to ensure high efficiency in all load ranges. These S-8340/8341 Series serve as ideal main power supply units for portable devices when coupled with the 8-Pin TSSOP package and high oscillation frequencies. Features • Oscillation frequency : 600 kHz (A and B types), 300 kHz (C and D types). • Output voltage : Selectable in 0.1 V steps between 2.5 to 6.0 V (output voltage fixed output type) • Output voltage accuracy : ±2.0% • Output voltage external setting (FB) type available. FB terminal voltage (VFB) 1.0 V • External parts : Coil, diode, capacitors (3), transistor, and resistor only • Duty ratio : 0 to 82% (typ.) PWM control (S-8340 Series) 27 to 82% (typ.) PWM/PFM switching control (S-8341 Series A and B types) 21 to 82% (typ.) PWM/PFM switching control (S-8341 Series C and D types) • Low-voltage operation: Oscillation guaranteed to start when VDD = 0.9 V • Built-in current limit circuit: Can be set with an external resistor (RSENSE) • Soft-start function set by an external capacitor (CSS) • Shutdown function • Lead-free, Sn 100%, halogen-free*1 *1. Refer to “ Product Name Structure” for details. Applications • Power supplies for portable equipments such as PDAs, electronic notebooks, and cellular phones • Power supplies for audio equipments such as portable CD players, portable MD players, and headphone stereos • Main or local power supplies for notebook PCs and peripherals • Constant voltage power supplies for cameras, VCRs, and communication devices Package • 8-Pin TSSOP |
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