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| 型号： | S-8340A25AFT-T2 |
| 元件分类： | 稳压器 |
| 英文描述： | 0.1 A SWITCHING CONTROLLER, 690 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封装： | TSSOP-8 |
| 文件页数： | 1/53页 |
| 文件大小： | 855K |
| 代理商： | S-8340A25AFT-T2 |
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Rev.2.2_00
STEP-UP, 600 kHz, PWM CONTROL OR PWM/PFM
SWITCHABLE SWITCHING REGULATOR CONTROLLER S-8340/8341 Series
Seiko Instruments Inc.
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
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
Drawing Code
Package Name
Package
Tape
Reel
8-Pin TSSOP
FT008-A
FT008-E
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相关代理商/技术参数 |
参数描述 |
|---|---|
| S-8340A25AFT-T2-G | 功能描述:DC/DC 开关控制器 2.5V Step-Up 2.0% RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| S-8340A30AFT-T2 | 功能描述:DC/DC 开关控制器 3.0V Step-Up 2.0% RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| S-8340A30AFT-T2-G | 功能描述:DC/DC 开关控制器 3.0V Step-Up 2.0% RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| S-8340A33AFT-T2 | 功能描述:DC/DC 开关控制器 3.3V Step-Up 2.0% RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| S-8340A33AFT-T2-G | 功能描述:DC/DC 开关控制器 3.3V Step-Up 2.0% RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
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