LTC1551 - Low Noise, Switched Capacitor-Regulated Voltage Inverters

Features

  • Regulated Negative Voltage from a Single Positive Supply
  • Low Output Ripple: Less Than 1mVP-P Typ
  • High Charge Pump Frequency: 900kHz Typ
  • Small Charge Pump Capacitors: 0.1µF
  • Requires Only Four External Capacitors
  • Fixed -4.1V or Adjustable Output
  • Shutdown Mode Drops Supply Current to < 1µA
  • High Output Current: Up to 10mA, VCC = 5V
  • Output Regulation: 5%
  • Available in SO-8 and 16-Lead SSOP

Typical Application

LTC1551 Typical Application
LTC1551 Typical Application

Description

The LTC1550/LTC1551 are switched capacitor charge pump voltage inverters which include internal linear post-regulators to minimize output ripple. Output voltages are fixed at –4.1V, with ripple voltages typically below 1mVP-P. The LTC1550 is also available in an adjustable output voltage version. The LTC1550/LTC1551 are ideal for use as bias voltage generators for GaAs transmitter FETs in portable RF and cellular telephone applications. The LTC1550/LTC1551 operate from single 4.5V to 6.5V supplies and draw typical quiescent currents of 4.25mA with a 5V supply. Each device includes a TTL compatible Shutdown pin which drops supply current to 0.2µA typically. The LTC1550 Shutdown pin is active low (SHDN), while the LTC1551 Shutdown pin is active high (SHDN). Only four external components are required: an input bypass capacitor, two 0.1µF charge pump capacitors and a filter capacitor at the linear regulator output. The adjustable LTC1550 requires two additional resistors to set the output voltage. The LTC1550/LTC1551 will supply up to 10mA output current with a 5V supply, while maintaining guaranteed output regulation of ±5%. The fixed voltage LTC1550/LTC1551 are available in S0-8 plastic packages. The adjustable LTC1550 is available in a 16-pin SSOP.

Packaging

CAD Symbols and Footprints: The downloadable Zip file below contains the schematic symbol and PCB footprints.

For complete and up to date package information and drawings, please refer to our packaging page

Part Number Package Code Temp Package
Drawing
RoHS
LTC1551CS8-4.1#PBF SO-8 S8 C 05-08-1610 (S8) Yes
LTC1551CS8-4.1#TRPBF SO-8 S8 C 05-08-1610 (S8) Yes


LTC1551 Package Drawing
LTC1551 Package Drawing

Order Info

  • Part numbers ending in PBF are lead free. Solder plated terminal finish (SnPb) versions are non-standard and special terms and conditions and pricing applies if available. Please contact LTC marketing for information.
  • Part numbers containing TR or TRM are shipped in tape and reel or 500 unit mini tape and reel, respectively
  • Please refer to our general ordering information or the product datasheet for more details

Package Variations and Pricing

Part Number Package Temp Price
(1-99)
Price
(1k)*
RoHS
LTC1551CS8-4.1#PBF SO-8 C $2.85 $2.25 Yes
LTC1551CS8-4.1#TRPBF SO-8 C $2.31 Yes
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* The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Linear Technology sales office or authorized distributor.

Demo Boards

Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.

Click here to view our complete list of demo boards

Applications

  • GaAs FET Bias Generators
  • Negative Supply Generators
  • Battery-Powered Systems
  • Single Supply Applications

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Design Tools

LTspice

LTspice® software is a powerful, fast and free simulation tool, schematic capture and waveform viewer with enhancements and models for improving the simulation of switching regulators. Click here to download LTspice

Models for the following parts are available in LTspice:
LTC1551CS8-4.1
LTC1551LCS8
LTC1551LCS8-4.1

Technical Support