Details, datasheet, quote on part number: S-8341C33AFT-T2
PartS-8341C33AFT-T2
CategoryPower Management and Supplies => IC Voltage Regulators => IC Switching Voltage Regulators => 7613340
TitleSWITCHING CONTROLLER, 345 kHz SWITCHING FREQ-MAX, PDSO8
Description
CompanySeiko Instruments
DatasheetDownload S-8341C33AFT-T2 datasheet
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Specifications 
Configuration / FunctionSINGLE
Package TypeOther, HALOGEN FREE AND LEAD FREE, TSSOP-8
Life Cycle StageACTIVE
VIN1 to 1.5 volts
fsw345 kHz
Operating Temperature-40 to 85 C (-40 to 185 F)

 

Features, Applications

STEP-UP, 600 kHz, PWM CONTROL OR PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER

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 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 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 0.1 V steps between 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 to 82% (typ.) PWM control (S-8340 Series) to 82% (typ.) PWM/PFM switching control (S-8341 Series A and B types) 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, 100%, halogen-free*1

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

STEP-UP, 600 kHz, PWM CONTROL OR PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER Rev.4.0_00 S-8340/8341 Series Block Diagrams

(1) S-8340/8341 Series A and C Types (Output Voltage Fixed Output Type)
Figure (2) S-8340/8341 Series B and D Types (Output Voltage External Setting Type)
Triangular wave oscillation circuit Phase compensation circuit

STEP-UP, 600 kHz, PWM CONTROL OR PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER Rev.4.0_00 S-8340/8341 Series Product Name Structure

The control method, product type, and output voltage values for the S-8340/8341 Series can be selected depending on usage. Refer to "1. Product Name" for the definition of the product name, "2. Package" regarding the package drawings and "3. Product Name List" for the full product names.

x Environmental code U : Lead-free (Sn 100%), halogen-free G : Lead-free (for details, please contact our sales office) IC direction in tape specifications Package name (abbreviation) : 8-Pin TSSOP Output voltage to 60 (E.g., when the output voltage it is expressed as 25.) Product type A : Output voltage fixed output type, fOSC = 600 kHz B : Output voltage external setting type, fOSC = 600 kHz C : Output voltage fixed output type, fOSC = 300 kHz D : Output voltage external setting type, fOSC = 300 kHz Control method 0 : PWM control 1 : PWM/PFM switching control

Package Name 8-Pin TSSOP Environmental code = G Environmental code = U Drawing Code Tape FT008-E-C-SD


 

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