TPS71257DRCR集成电路（IC）的线性+开关稳压器规格书PDF中文资料

1FEATURES

• 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 mVrms

• Fast Start-Up Time: 60 ms

• Stable with 2.2 mF 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 x 3mm x 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

DESCRIPTION

The TPS712xx family of low-dropout (LDO) voltage

regulators is tailored to noise-sensitive and RF

applications. 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 mF ceramic output capacitors and

features very low dropout voltages (125 mV typical at

250 mA). Each regulator achieves fast start-up times

(approximately 60 ms with a 0.001 mF bypass

capacitor) while consuming very low quiescent

current (300 mA typical with both outputs enabled).

When the device is placed in standby mode, the

supply current is reduced to less than 0.3 mA typical.

Each regulator exhibits approximately 32 mVrms of

output voltage noise with VOUT = 2.8 V and a 0.01 mF

noise reduction (NR) capacitor. Applications with

analog components that are noise-sensitive, such as

portable RF electronics, will benefit from high PSRR,

low noise, and fast line and load transient features. The TPS712 family is offered in a thin 3mm x 3mm

SON package and is fully specified from -40°C to

+125°C (TJ).