Datasheet > TPS7A85A

TPS7A85A

更新时间： 2024-11-24 11:12:03

品牌	Logo	应用领域
德州仪器 - TI		稳压器
页数	文件大小	规格书
49页	3362K
描述
具有电源正常指示功能的 4A、低输入电压 (1.1V)、低噪声、高精度、超低压降稳压器

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TPS7A85A

SBVS313 –JUNE 2017

TPS7A85A 4-A, High-Accuracy (0.75%), Low-Noise (4.4 μVRMS), LDO Regulator

1 Features

3 Description

The TPS7A85A is a low-noise (4.4 μV_RMS), low

dropout linear regulator (LDO) capable of sourcing 4

A with only 240 mV of maximum dropout. The device

output voltage is pin-programmable from 0.8 V to

3.95 V and adjustable from 0.8 V to 5.1 V using an

external resistor divider.

•

Low Dropout: 150 mV (Typical) at 4 A

•

0.75% (Maximum) Accuracy Over Line, Load, and

Temperature With BIAS

•

Output Voltage Noise:

–

4.4 μV_RMSat 0.8-V Output

7.7 μV_RMSat 5.1-V Output

The combination of low-noise (4.4 μV_RMS), high-

PSRR, and high output current capability makes the

•

Input Voltage Range:

TPS7A85A

ideal

power

noise-sensitive

–

Without BIAS: 1.4 V to 6.5 V

With BIAS: 1.1 V to 6.5 V

components such as those found in high-speed

communications, video, medical, or test and

measurement applications. The high performance of

the TPS7A85A limits power-supply-generated phase

noise and clock jitter, making this device ideal for

powering high-performance serializer and deserializer

(SerDes), analog-to-digital converters (ADCs), digital-

to-analog converters (DACs), and RF components.

Specifically, RF amplifiers benefit from the high-

performance and 5.1-V output capability of the

device.

•

ANY-OUT™ Operation:

Output Voltage Range: 0.8 V to 3.95 V

Adjustable Operation:

Output Voltage Range: 0.8 V to 5.1 V

Power-Supply Ripple Rejection:

40 dB at 500 kHz

–

•

Excellent Load Transient Response

Adjustable Soft-Start In-Rush Control

Open-Drain Power-Good (PG) Output

For digital loads (such as application-specific

integrated circuits (ASICs), field-programmable gate

arrays (FPGAs), and digital signal processors

(DSPs)) requiring low-input voltage, low-output (LILO)

voltage operation, the exceptional accuracy (0.75%

over load and temperature), remote sensing,

excellent transient performance, and soft-start

capabilities of the TPS7A85A ensure optimal system

performance.

Stable with a 47-μF or Larger Ceramic Output

Capacitor

•

θ_JC= 3.4°C/W

3.5-mm × 3.5-mm, 20-Pin VQFN

2 Applications

The versatility of the TPS7A8500A makes the device

•

Digital Loads: SerDes, FPGAs, and DSPs

Instrumentation, Medical, and Audio

High-Speed Analog Circuits:

component of choice for many demanding

applications.

Device Information⁽¹⁾

–

VCO, ADC, DAC, and LVDS

PART NUMBER

PACKAGE

BODY SIZE (NOM)

•

Imaging: CMOS Sensors and Video ASICs

Test and Measurement

TPS7A85A

VQFN (20)

3.50 mm × 3.50 mm

(1) For all available packages, see the orderable addendum at

the end of the data sheet.

Powering RF Components

Powering Digital Loads

TPS7A85A

C_BIAS

Bias

Supply

Input Supply

OUT

1.4 V_IN

BIAS

C_IN

OUT

SNS

VCC

R_PG

0.9 V_OUT

To Digital

Load

NR/SS

C_OUT

C_NR/SS

IQ Modulators

IQ Demodulators

TPS7A85A

1.6 V

TRF372017

TRF3722

TRF371125

TRF371135

C_FF

800 mV

400 mV

200 mV

100 mV

50 mV

ANYOUT

Used to set

voltage

GND

An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,

intellectual property matters and other important disclaimers. PRODUCTION DATA.

12 3 4 5 6 7...49

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