- 您现在的位置：买卖IC网 > PDF目录136945 > TPS82678SIP (TEXAS INSTRUMENTS INC) 0.6 A SWITCHING REGULATOR, 6000 kHz SWITCHING FREQ-MAX, BGA8 PDF资料下载
参数资料
| 型号： | TPS82678SIP |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 0.6 A SWITCHING REGULATOR, 6000 kHz SWITCHING FREQ-MAX, BGA8 |
| 封装： | 2.30 X 2.90 MM, 1 MM HEIGHT, LEAD FREE, USIP-8 |
| 文件页数： | 8/28页 |
| 文件大小： | 943K |
| 代理商： | TPS82678SIP |
第1页第2页第3页第4页第5页第6页第7页当前第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页
PFMModeatLightLoad
PFMRipple
PWMModeatHeavyLoad
NominalDCOutputVoltage
SLVSAI0A
– OCTOBER 2010 – REVISED APRIL 2011
DETAILED DESCRIPTION
OPERATION
The TPS8267x is a stand-alone, synchronous, step-down converter. The converter operates at a regulated
5.5-MHz frequency pulse width modulation (PWM) at moderate to heavy load currents (up to 600mA output
current). At light load currents, the TPS8267x converter operates in power-save mode with pulse frequency
modulation (PFM).
The converter uses a unique frequency-locked ring-oscillating modulator to achieve best-in-class load and line
response. One key advantage of the non-linear architecture is that there is no traditional feed-back loop. The
loop response to change in VO is essentially instantaneous, which explains the transient response. Although this
type of operation normally results in a switching frequency that varies with input voltage and load current, an
internal frequency lock loop (FLL) holds the switching frequency constant over a large range of operating
conditions.
Combined with best-in-class load and line-transient response characteristics, the low quiescent current of the
device (approximately 17
μA) helps to maintain high efficiency at light load while that current preserves a fast
transient response for applications that require tight output regulation.
The TPS8267x integrates an input current limit to protect the device against heavy load or short circuits and
features an undervoltage lockout circuit to prevent the device from misoperation at low input voltages. Fully
functional operation is permitted down to 2.1V input voltage.
POWER-SAVE MODE
If the load current decreases, the converter enters power-save mode automatically. During power-save mode,
the converter operates in discontinuous current, (DCM) single-pulse PFM mode, which produces a low output
ripple compared with other PFM architectures.
When in power-save mode, the converter resumes its operation when the output voltage falls below the nominal
voltage. The converter ramps up the output voltage with a minimum of one pulse and goes into power-save
mode when the output voltage is within its regulation limits.
The IC exits PFM mode and enters PWM mode when the output current can no longer be supported in PFM
mode. As a consequence, the DC output voltage is typically positioned approximately 0.5% above the nominal
output voltage. The transition between PFM and PWM is seamless.
Figure 40. Operation in PFM Mode and Transfer to PWM Mode
MODE SELECTION
The MODE pin selects the operating mode of the device. Connecting the MODE pin to GND enables the
automatic PWM and power-save mode operation. The converter operates in regulated frequency PWM mode at
moderate to heavy loads, and operates in PFM mode during light loads. This type of operation maintains high
efficiency over a wide load current range.
Pulling the MODE pin high forces the converter to operate in PWM mode even at light-load currents. The
advantage is that the converter modulates its switching frequency according to a spread spectrum PWM
modulation technique that allows simple filtering of the switching harmonics in noise-sensitive applications. In this
mode, the efficiency is lower when compared to the power-save mode during light loads.
16
Copyright
2010–2011, Texas Instruments Incorporated
相关PDF资料 |
PDF描述 |
|---|---|
| TC151B2912EOA723 | 0.25 A SWITCHING REGULATOR, 50 kHz SWITCHING FREQ-MAX, PDSO8 |
| TC151B1717EOA713 | 0.25 A SWITCHING REGULATOR, 50 kHz SWITCHING FREQ-MAX, PDSO8 |
| TC151B3017EOA723 | 0.25 A SWITCHING REGULATOR, 50 kHz SWITCHING FREQ-MAX, PDSO8 |
| TC151A3320EOA723 | 0.25 A SWITCHING REGULATOR, 50 kHz SWITCHING FREQ-MAX, PDSO8 |
| TC151A5339EOA723 | 0.25 A SWITCHING REGULATOR, 50 kHz SWITCHING FREQ-MAX, PDSO8 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| TPS8267XEVM | 制造商:TI 制造商全称:Texas Instruments 功能描述:The TPS82671 and TPS82675 devices are series of high-frequency, synchronous, step-down dc-dc converters optimized for battery-powered portable applications |
| TPS8268090SIPT | 功能描述:Buck Switching Regulator IC Positive Fixed 0.9V 1 Output 1.6A 9-SMD Module 制造商:texas instruments 系列:- 包装:剪切带（CT） 零件状态:有效 功能:降压 输出配置:正 拓扑:降压 输出类型:固定 输出数:1 电压 - 输入（最小值）:2.5V 电压 - 输入（最大值）:5.5V 电压 - 输出（最小值/固定）:0.9V 电压 - 输出（最大值）:- 电流 - 输出:1.6A 频率 - 开关:5.5MHz 同步整流器:是 工作温度:-40°C ~ 85°C（TA） 安装类型:表面贴装 封装/外壳:9-SMD 模块 供应商器件封装:9-USIP 标准包装:1 |
| TPS8268105SIPT | 功能描述:Buck Switching Regulator IC Positive Fixed 1.05V 1 Output 1.6A 9-SMD Module 制造商:texas instruments 系列:- 包装:剪切带（CT） 零件状态:有效 功能:降压 输出配置:正 拓扑:降压 输出类型:固定 输出数:1 电压 - 输入（最小值）:2.5V 电压 - 输入（最大值）:5.5V 电压 - 输出（最小值/固定）:1.05V 电压 - 输出（最大值）:- 电流 - 输出:1.6A 频率 - 开关:5.5MHz 同步整流器:是 工作温度:-40°C ~ 85°C（TA） 安装类型:表面贴装 封装/外壳:9-SMD 模块 供应商器件封装:9-USIP 标准包装:1 |
| TPS8268120SIPR | 功能描述:Buck Switching Regulator IC Positive Fixed 1.2V 1 Output 1.6A 9-VBGA 制造商:texas instruments 系列:- 包装:剪切带（CT） 零件状态:有效 功能:降压 输出配置:正 拓扑:降压 输出类型:固定 输出数:1 电压 - 输入（最小值）:2.5V 电压 - 输入（最大值）:5.5V 电压 - 输出（最小值/固定）:1.2V 电压 - 输出（最大值）:- 电流 - 输出:1.6A 频率 - 开关:5.5MHz 同步整流器:是 工作温度:-40°C ~ 85°C（TA） 安装类型:表面贴装 封装/外壳:9-VBGA 供应商器件封装:9-USIP 标准包装:1 |
| TPS8268120SIPT | 功能描述:Buck Switching Regulator IC Positive Fixed 1.2V 1 Output 1.6A 9-VBGA 制造商:texas instruments 系列:- 包装:剪切带（CT） 零件状态:有效 功能:降压 输出配置:正 拓扑:降压 输出类型:固定 输出数:1 电压 - 输入（最小值）:2.5V 电压 - 输入（最大值）:5.5V 电压 - 输出（最小值/固定）:1.2V 电压 - 输出（最大值）:- 电流 - 输出:1.6A 频率 - 开关:5.5MHz 同步整流器:是 工作温度:-40°C ~ 85°C（TA） 安装类型:表面贴装 封装/外壳:9-VBGA 供应商器件封装:9-USIP 标准包装:1 |
发布紧急采购，3分钟左右您将得到回复。