TPS71257 双路 250mA 输出、超低噪声、高 PSRR 低压降线性稳压器

TPS71257 描述

The TPS712xx family of low-dropout (LDO) voltage regulators is tailored to noise-sensitive and RF appli- cations. These products feature dual 250 mA LDOs with ultralow noise, high power-supply rejection ratio (PSRR), and fast transient and start-up response. Each regulator output is stable with low-cost 2.2 µF ceramic output capacitors and features very low dropout voltages (125 mV typical at 250 mA). Each regulator achieves fast start-up times (approximately 60 µs with a 0.001 µF bypass capacitor) while consuming very low quiescent current (300 µA typical with both outputs enabled). When the device is placed in standby mode, the supply current is re- duced to less than 0.

	TPS71202	TPS71219	TPS71229	TPS71247	TPS71256	TPS71257
Iout(Max)(A)	0.25	0.25	0.25	0.25	0.25	0.25
Iout2(A)	0.25	0.25	0.25	0.25	0.25	0.25
Vdo(Typ)(mV)	125	125	125	125	125	125
Vin(Min)(V)	2.7	2.7	2.7	2.7	2.7	2.7
Vin(Max)(V)	5.5	5.5	5.5	5.5	5.5	5.5
Fixed Output Options(V)		1.8/ADJ, 2.8/ADJ, 1.8/2.85, 2.8/2.8, 2.85/2.85	1.8/ADJ, 2.8/ADJ, 1.8/2.85, 2.8/2.8, 2.85/2.85	1.8/ADJ, 2.8/ADJ, 1.8/2.85, 2.8/2.8, 2.85/2.85	1.8/ADJ, 2.8/ADJ, 1.8/2.85, 2.8/2.8, 2.85/2.85	1.8/ADJ, 2.8/ADJ, 1.8/2.85, 2.8/2.8, 2.85/2.85
Accuracy(%)	3	3	3	3	3	3
Output Capacitor(uF)	4.7	4.7	2.2	4.7	2.2	2.2
Output Capacitor Type	Ceramic	Ceramic	Ceramic	Ceramic	Ceramic	Ceramic
Pin/Package	10SON	10SON	10SON	10SON	10SON	10SON
Vout2(Min)(V)	1.2	1.2	1.2	2.85	2.8	2.85
Vout2(Max)(V)	5.5	5.5	5.5	2.85	2.8	2.85
Rating	Catalog	Catalog	Catalog	Catalog	Catalog	Catalog
Vout(Min)(V)	1.2	1.8	2.8	1.8	2.8	2.85
Vout(Max)(V)	5.5	1.8	2.8	1.8	2.8	2.85
Regulated Outputs(#)	2	2	2	2	2	2

TPS71257 特性

Dual 250 mA High-Performance RF LDOs
Available in Fixed and Adjustable Voltage Options (1.2 V to 5.5 V)
High PSRR: 65 dB at 10 kHz
UltraLow Noise: 32 µVrms
Fast Start-Up Time: 60 µs
Stable with 2.2 µF Ceramic Capacitor
Excellent Load/Line Transient Response
Very Low Dropout Voltage: 125 mV at 250 mA
Independent Enable Pins
Thermal Shutdown and Independent Current Limit
Available in Thermally-Enhanced SON Package: 3mm × 3mm × 1mm
APPLICATIONS
- Cellular and Cordless Phones
- Wireless PDA/Handheld Products
- PCMCIA/Wireless LAN Applications
- Digital Camera/Camcorder/Internet Audio
- DSP/FPGA/ASIC/Controllers and Processors

TPS71257 芯片订购指南

器件	状态	温度 (oC)	价格（美元）	封装 \| 引脚	封装数量 \| 封装载体	丝印标记
TPS71257DRCR	ACTIVE	-40 to 125	0.80 \| 1ku	SON (DRC) \| 10	3000 \| LARGE T&R	ARV
TPS71257DRCT	ACTIVE	-40 to 125	0.90 \| 1ku	SON (DRC) \| 10	250 \| SMALL T&R	ARV

TPS71257 质量与无铅数据

器件	环保计划*	铅/焊球涂层	MSL 等级/回流焊峰	环保信息与无铅 (Pb-free)	DPPM / MTBF / FIT 率
TPS71257DRCR	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-2-260C-1 YEAR	TPS71257DRCR	TPS71257DRCR
TPS71257DRCT	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-2-260C-1 YEAR	TPS71257DRCT	TPS71257DRCT

TPS71257 应用技术支持与电子电路设计开发资源下载

TPS71257 数据资料 dataSheet 下载.PDF
TI 德州仪器LDO低压差线性稳压器驱动器选型与价格参考 . xls
Dual MOSFET Driver (PDF 498 KB)
全面认识开关型电源中的BUCK-BOOST功率级 (Rev. A) (PDF 2206 KB)
LDO PSRR Measurement Simplified (PDF 140 KB)
LDO Noise Demystified (PDF 782 KB)
标准线性产品交叉参考 (Rev. D) (PDF 1058 KB)
模数规格和性能特性术语表 (Rev. A) (PDF 1993 KB)
所选封装材料的热学和电学性质 (PDF 645 KB)
高速数据转换 (PDF 1967 KB)

TPS71257 工具与软件

名称	型号	公司	工具/软件类型
TPS71257 评估模块	TPS71257EVM	Texas Instruments	开发电路板/EVM