Step-Down

AAT1171 Datasheet PDF – Step-Down Converter – Skyworks

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Part Number: AAT1171

Function: 600mA, Voltage-Scaling Step-Down Converter

Package : TDFN33-12, WLCSP-5 Type

Manufacturer: Skyworks Solutions

Pinouts:

AAT1171 datasheet

 

Description

The AAT1171 SwitchReg™ dynamically controls the operating voltage of a WCDMA or CDMA power amplifier inside single-cell, lithium-ion battery-powered systems. The AAT1171 outputs a voltage between 0.6V and 3.6V, thereby optimizing the amplifier efficiency at both low and high transmit levels.

The AAT1171 output voltage is controlled via an analog signal from the baseband processor. It can deliver
600mA of continuous load current while maintaining a low 45μA of no load quiescent current. The 2MHz switching frequency minimizes the size of external components while keeping switching losses low. To further improve system efficiency, an 85mΩ bypass MOSFET transistor is also included to allow the PA to be powered directly from the battery.

Features

1. VIN Range : 2.7V to 5.5V
2. Variable Output Voltage : 0.6V to 3.6V
3. 600mA Output Current
4. DAC Input: 0.2V to 1.2V
5. High Output Accuracy : ±3%
6. 45μA No Load Quiescent Current
7. Internal Soft Start Limits Startup Current and Output Voltage Overshoot
8. Synchronizable to External 19.8MHz System Clock
9. Over-Temperature and Current Limit Protection
10. Integrated 85mΩ Bypass MOSFET
11. 2MHz Operation

Applications

1. WCDMA or CDMA PA in Cellular Phones, Smartphones, Feature Phones, etc.
2. Express Card
3. PCMCIA Data Cards

Other data sheets are available within the file: AAT1171IUP-1-T1, AAT1171IWP-1-T1

AAT1171 Datasheet PDF Download

AAT1171 pdf


 

LM2595 Datasheet PDF – Step-Down (Buck) Converter – TI

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Part Number: LM2595

Function: LM2595 SIMPLE SWITCHER® Power Converter 150 kHz 1A Step-Down Voltage Regulator

Manufacturer: Texas Instruments

Pinouts:

LM2595 datasheet

 

Description

The LM2595 series of regulators are monolithic integrated circuits that provide all the active functions for a step-down (buck) switching regulator, capable of driving a 1A load with excellent line and load regulation. These devices are available in fixed output voltages of 3.3V, 5V, 12V, and an adjustable output version.

Requiring a minimum number of external components, these regulators are simple to use and include internal frequency compensation†, and a fixed-frequency oscillator.

The LM2595 series operates at a switching frequency of 150 kHz thus allowing smaller sized filter components than what would be needed with lower frequency switching regulators. Available in a standard 5-lead TO-220 package with several different lead bend options, and a 5-lead TO-263 surface mount package. Typically, for output voltages less than 12V, and ambient temperatures less than 50°C, no heat sink is required.

 

Features

1. 3.3V, 5V, 12V, and Adjustable Output Versions
2. Ensured 1A Output Load Current
3. Input Voltage Range Up to 40V

Official Homepage: https://www.ti.com/product/lm2595

LM2595 Datasheet PDF Download

LM2595 pdf

Other data sheets are available within the file: LM2595S-12, LM2595S-12/NOPB, LM2595S-3.3, LM2595S-3.3/NOPB