参数资料
| 型号： | SC194BMLTRT |
| 厂商： | Semtech |
| 文件页数： | 1/17页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK ADJ 1A 10MLP |
| 标准包装： | 1 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 可调 |
| 输入电压： | 2.7 V ~ 5.5 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 1MHz |
| 电流 - 输出： | 1A |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 10-VFDFN 裸露焊盘 |
| 包装： | 标准包装 |
| 供应商设备封装： | 10-MLP（3x3） |
| 产品目录页面： | 1357 (CN2011-ZH PDF) |
| 其它名称： | SC194BMLDKR |
SC194B
Selectable 3.6V/3.3V/3.0V/2.5V
1A Synchronous Buck Converter
POWER MANAGEMENT
Description
The SC194B is a synchronous step-down converter with
integrated power devices. Four selectable output voltages
suitable for portable device interface, memory function
blocks, and 5V to 3.3V voltage conversion are available.
Automatic selection of Power Save Mode (PSAVE) is
supported which enhances ef ? ciency. A 100% duty cycle
mode allows operation for input voltages close to the
required output voltage.
The need for external components is minimized by
providing internal feedback compensation, and allowing
selection of the required output voltage by hard wiring VID
code inputs. The maximum current rating of the internal
MOSFET switches allows a DC output current of 1A.
The switching frequency is nominally set to 1MHz, allowing
the use of small inductors and capacitors. A ? exible
clocking scheme is used that allows synchronization to an
external oscillator or control by the internal oscillator.
The device can operate in either forced PWM mode or
in PSAVE mode. If PSAVE mode is enabled the part will
automatically enter PSAVE at light loads to maintain
maximum ef ? ciency across the full load range. For noise
sensitive applications, PSAVE mode can be disabled by
synchronizing to an external oscillator, or pulling the SYNC/
PWM pin high. Shutdown turns off all the control circuitry
to achieve a typical shutdown current of 0.1 μ A.
Typical Application Circuit
Features
Up to 95% ef ? ciency
PSAVE operation to maximize ef ? ciency
Output current — 1A
Input range — 2.7V to 5.5V
Four selectable output voltages
Quiescent current — 17 μ A in PSAVE
Dynamic voltage positioning capability
Fixed 1MHz frequency or 750kHz to 1.25MHz syn-
chronized operation
Current mode operation for excellent line and load
transient response
100% duty cycle in dropout
Soft-start
Over-temperature and short-circuit protection
Lead-free package — 3mm x 3mm MLPD
Applications
PDA
Pocket PC and Smart Phones
USB Powered Modems
CPUs and DSPs
PC Cards and Notebooks
xDSL Applications
Standard 5-V to 3.3-V Conversion
V IN
3.6V to 5.5V
C IN
SC194B
VIN
EN
SYNC/PWM
VID0
LX
VOUT
L1
4.7 μ H
C OUT
V OUT
3.3V
1A
VID1
PGND
August 24, 2006
10 μ F
MODE
1
GND
22 μ F
www.semtech.com
相关PDF资料 |
PDF描述 |
|---|---|
| SC195ULTRT | IC REG BUCK SYNC ADJ 0.5A 8MLPQ |
| SC196AMLTRT | IC REG BUCK SYNC 1.5A 10MLP |
| SC196ULTRT | IC REG BUCK SYNC ADJ 1.5A 10MLPD |
| SC198AMLTRT | IC REG BUCK SYNC PROG .8A 20MLPQ |
| SC198MLTRT | IC REG BUCK SYNC PROG .6A 20MLPQ |
相关代理商/技术参数 |
参数描述 |
|---|---|
| SC195 | 制造商:SEMTECH 制造商全称:Semtech Corporation 功能描述:3.5MHz, 500mA Synchronous Step Down DC-DC Regulator |
| SC195_10 | 制造商:SEMTECH 制造商全称:Semtech Corporation 功能描述:3.5MHz, 500mA Synchronous Step Down DC-DC Regulator |
| SC1959 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Mini size of Discrete semiconductor elements |
| SC195EVB | 制造商:SEMTECH 制造商全称:Semtech Corporation 功能描述:3.5MHz, 500mA Synchronous Step Down DC-DC Regulator |
| SC195UL.TRT | 制造商:SEMTECH 功能描述:I.C. |
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