AAT1171 Datasheet PDF – Step-Down Converter – Skyworks

Part Number: AAT1171

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

Package : TDFN33-12, WLCSP-5 Type

Manufacturer: Skyworks Solutions


AAT1171 datasheet



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.


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


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


SY8208BQNC Datasheet – Synchronous Step Down Regulator

Part Number: SY8208BQNC

Function: Synchronous Step Down Regulator

Package: QFN3x3-10

Manufacturer: Silergy

Image :

SY8208BQNC Image


1. Low RDS(ON) for internal switches (top/bottom) : 20/10 mΩ
2. Wide input voltage range : 4-28V
3. Instant PWM architecture to achieve fast transient responses
4. Internal 400uS softstart limits the inrush current
5. Pseudo-constant frequency : 800kHz.


SY8208BQNC Pinout


2. Set Top Box
3. Notebook
4. High Power AP

SY8208BQNC Datasheet

SY8208BQNC pdf datasheet

SY8208BQNC Datasheet

Reference Datasheet : SY8208AQNC Datasheet

The SY8208A develops a high efficiency synchronous step-down DC-DC regulator capable of delivering 8A continuous, 16A peak current. The SY8208A operates over a wide input voltage range from 4V to 28V and integrates main switch and synchronous switch with very low R DS(ON) to minimize the conduction loss. The SY8208A adopts the instant PWM architecture to achieve fast transient responses for high step down applications and high efficiency at light loads. In addition, it operates at pseudo-constant frequency of 800kHz under continuous conduction mode to minimize the size of inductor and capacitor.

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