PT4115 Datasheet – 30V, 1.2A Step-down LED Driver

Part Number : PT4115

Function : 30V, 1.2A Step-down  High Brightness LED Driver with 5000:1 Dimming

Package : SOT89-5 , ESOP8 Pin Type

Manufacturers : PowTech

See the preview image and the PT4115 Datasheet file for more information.

Image :

PT4115 image
Description :

The PT4115 is a continuous conduction mode inductive step-down converter, designed for driving single or multiple series connected LED efficiently from a voltage source higher than the total LED chain voltage.
The device operates from an input supply between 6V and 30V and provides an externally adjustable output current of up to 1.2A. Depending upon the supply voltage and external components, the PT4115 can provide more than 30 watts of output power. The PT4115 includes the power switch and a high-side output current sensing circuit, which uses an external resistor to set the nominal average output current, and a dedicated DIM input accepts either a DC voltage or a wide range of pulsed dimming. Applying a voltage of 0.3V or lower to the DIM pin turns the output off and switches the device into a low current standby state.

PT4115 Pinout

PT4115 pinout

Features

1. Simple low parts count
2. Wide input voltage range: 6V to 30V
3. Up to 1.2A output current
4. Single pin on/off and brightness control  using DC voltage or PWM
5. Up to 1MHz switching frequency
6. Typical 5% output current accuracy
7. Inherent open-circuit LED protection
8. High efficiency (up to 97%)
9. High-Side Current Sense
10. Hysteretic Control: No Compensation
11. Adjustable Constant LED Current
12. ESOP8 package for large output power application
13. RoHS compliant

Circuit

PT4115 circuit

Other data sheets within the file : PT4115B89E, PT4115B89E-B, PT4115BSOH, PT4115BSOH-B

PT4115 Datasheet PDF Download

AAT1171 Datasheet PDF – Step-Down Converter – Skyworks

Part Number : AAT1171

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

Package : TDFN33-12, WLCSP-5 Type

Manufacturers : 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 within the file : AAT1171IUP-1-T1, AAT1171IWP-1-T1

AAT1171 Datasheet PDF Download

AAT1171 pdf