TPS7A8901RTJR集成电路（IC）的线性+开关稳压器规格书PDF中文资料

TPS7A8901RTJR属于集成电路（IC）的线性+开关稳压器。由德州仪器制造生产的TPS7A8901RTJR稳压器 - 线性线性稳压器用于提供稳定的输出电压，无论负载电流、输入电压或环境因素如何变化，这些输出电压通常都要保持不变。它们的工作原理要求输入电压维持在高于所需的输出电压，而且要超出某个最小量，并且在工作时会将输入端的任何多余电压转换为热量。对于大多数应用而言，虽然这种稳压器的效率低于开关模式的稳压器，但它们通常更适合对噪声高度敏感的应用。

1 Features

1• Two Independent LDO Channels

• 4-mm × 4-mm, 20-Pin WQFN Package

• Low Output Noise: 3.8 μVRMS (10 Hz to 100 kHz)

• Low Dropout: 180 mV (typ) at 2 A

• Wide Input Voltage Range: 1.4 V to 6.5 V

• Wide Output Voltage Range: 0.8 V to 5.2 V

• High Power-Supply Rejection Ratio (PSRR):

– 75 dB at DC

– 40 dB at 100 kHz

– 40 dB at 1 MHz

• 1.0% Accuracy Over Line, Load, and Temperature

• Excellent Load Transient Response

• Adjustable Start-Up In-Rush Control

• Selectable Soft-Start Charging Current

• Independent Open-Drain Power-Good (PGx)

Outputs

• Stable with a 10 μF or Larger Ceramic Output

Capacitor

2 Applications

• High-Speed Analog Circuits:

– VCOs, ADCs, DACs, LVDSs

• Imaging: CMOS Sensors, Video ASICs

• Test and Measurement

• Instrumentation, Medical, and Audio

• Digital Loads Auxiliary Rails:

– SerDes, FPGAs, DSPs

3 Description

The TPS7A89 is a dual, low-noise (3.8 μVRMS), lowdropout

(LDO) voltage regulator capable of sourcing

2 A per channel with only 400 mV of maximum

dropout.

The TPS7A89 provides the flexibility of two

independent LDOs and approximately 60% smaller

solution size than two single-channel LDOs. Each

output is adjustable with external resistors from 0.8 V

to 5.2 V. The wide input-voltage range of the

TPS7A89 supports operation as low as 1.4 V and up

to 6.5 V.

With 1% output voltage accuracy (over line, load, and

temperature) and soft-start capabilities to reduce inrush

current, the TPS7A89 is ideal for powering

sensitive analog low-voltage devices [such as

voltage-controlled oscillators (VCOs), analog-to-digital

converters (ADCs), digital-to-analog converters

(DACs), high-end processors, and fieldprogrammable

gate arrays (FPGAs)].

The TPS7A89 is designed to power noise-sensitive

components such as those found in high-speed

communication, video, medical, or test and

measurement applications. The very low 3.8-μVRMS

output noise and wideband PSRR (40 dB at 1 MHz)

minimizes phase noise and clock jitter. These

features maximize the performance of clocking

devices, ADCs, and DACs.