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LT1611 Datasheet

LT1611 Datasheet

Inverting 1.4MHz Switching Regulator in 5-Lead SOT-23
Part No.: LT1611
Page: 12 Pages
Size: 243 KB
Manufacturer: Linear Technology
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Views: 3
Update Time: 2023-12-19 15:00:37
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LT1611 Datasheet Applicable Part

Part No. Packing SPQ Marking MSL Pins Temp Range Package Description Buy
LT1611CS5#PBF Tube   LTES 1 5 0°C ~ 70°C 5-Lead TSOT-23  
LT1611CS5#TRPBF Reel 2500 LTES 1 5 0°C ~ 70°C 5-Lead TSOT-23  
LT1611CS5#TRMPBF Reel 500 LTES 1 5 0°C ~ 70°C 5-Lead TSOT-23  
SPQ:Standard Pack Quantity;MSL:Moisture Sensitivity Level

LT1611 Datasheet(PDF)

LT1611 Datasheet(Picture)

LT1611 Features

  • Very Low Noise: 1mVP–P Output Ripple
  • –5V at 150mA from a 5V Input
  • Better Regulation Than a Charge Pump
  • Effective Output Impedance: 0.14Ω
  • Uses Tiny Capacitors and Inductors
  • Internally Compensated
  • Fixed Frequency 1.4MHz Operation
  • Low Shutdown Current: <1µA
  • Low VCESAT Switch: 300mV at 300mA
  • Tiny 5-Lead SOT-23 Package

LT1611 Applications

  • MR Head Bias
  • Digital Camera CCD Bias
  • LCD Bias
  • GaAs FET Bias
  • Positive-to-Negative Conversion

LT1611 Description

The LT1611 is the industry’s first inverting 5-lead SOT-23 current mode DC/DC converter. Intended for use in small, low power applications, it operates from an input voltage as low as 1.1V and switches at 1.4MHz, allowing the use of tiny, low cost capacitors and inductors 2mm or less in height. Its small size and high switching frequency enable the complete DC/DC converter function to consume less than 0.25 square inches of PC board area. Capable of generating –5V at 150mA from a 5V supply or –5V at 100mA from a 3V supply, the LT1611 replaces nonregulated “charge pump” solutions in many applications.

The LT1611 operates in a dual inductor inverting topology which filters the input side as well as the output side of the DC/DC converter. Fixed frequency switching ensures a clean output free from low frequency noise typically present with charge pump solutions. No load quiescent current of the LT1611 is 3mA, while in shutdown quiescent current drops to 0.5µA. The 36V switch allows VIN to VOUT differential of up to 33V.

The LT1611 is available in the 5-lead SOT-23 package.

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