LTC1550L - 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, ±2.5V, ±2V or Adjustable Output
  • Shutdown Mode Drops Supply Current to <1µA
  • High Output Current: Up to 20mA (Depending on VCC to VOUT Range)
  • Output Regulation: 2.5% Over Line, Load and Temperature
  • Available in 8-Lead MSOP, 8-Lead Narrow SO and 16-Lead Narrow SSOP

Typical Application

LTC1550L Typical Application
LTC1550L Typical Application

Description

The LTC1550L/LTC1551L are switched capacitor charge pump voltage inverters which include internal linear post-regulators to minimize output ripple. The LTC1550L fixed output voltage versions include ±4.1V, ±2.5V and ±2V with ripple voltages typically below 1mVP-P. The LTC1550L is also available in an adjustable output voltage version. The LTC1550L/LTC1551L are ideal for use as bias voltage generators for GaAs transmitter FETs in portable RF and cellular telephone applications.

The LTC1550L/LTC1551L operate from single 2.7V to 5.5V supplies and draw typical quiescent currents of 3.5mA with a 5V supply. Each device includes a TTL compatible Shutdown pin which drops supply current to 0.2µA typically. The LTC1550L Shutdown pin is active low (SHDN), while the LTC1551L 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 LTC1550L/LTC1551L require two additional resistors to set the output voltage. The LTC1550L/LTC1551L will supply up to 20mA (depending on VCC to VOUT range), while maintaining guaranteed output regulation of ±2.5%.

Both fixed voltage and adjustable LTC1550L/LTC1551L are available in 8-lead MSOP and SO plastic packages: the adjustable LTC1550L is also available in a 16-pin SSOP with the REG pin.

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
LTC1550LCGN#PBF SSOP-16 GN C 05-08-1641 (GN16) Yes
LTC1550LCGN#TRPBF SSOP-16 GN C 05-08-1641 (GN16) Yes
LTC1550LCMS8-2.5#PBF MS-8 MS8 C 05-08-1660 Yes
LTC1550LCMS8-2.5#TRPBF MS-8 MS8 C 05-08-1660 Yes
LTC1550LCMS8-2#PBF MS-8 MS8 C 05-08-1660 Yes
LTC1550LCMS8-2#TRPBF MS-8 MS8 C 05-08-1660 Yes
LTC1550LCMS8-4.1#PBF MS-8 MS8 C 05-08-1660 Yes
LTC1550LCMS8-4.1#TRPBF MS-8 MS8 C 05-08-1660 Yes
LTC1550LCMS8#PBF MS-8 MS8 C 05-08-1660 Yes
LTC1550LCMS8#TRPBF MS-8 MS8 C 05-08-1660 Yes
LTC1550LCS8-2.5#PBF SO-8 S8 C 05-08-1610 (S8) Yes
LTC1550LCS8-2.5#TRPBF SO-8 S8 C 05-08-1610 (S8) Yes
LTC1550LCS8-2#PBF SO-8 S8 C 05-08-1610 (S8) Yes
LTC1550LCS8-2#TRPBF SO-8 S8 C 05-08-1610 (S8) Yes
LTC1550LCS8-4.1#PBF SO-8 S8 C 05-08-1610 (S8) Yes
LTC1550LCS8-4.1#TRPBF SO-8 S8 C 05-08-1610 (S8) Yes
LTC1550LCS8#PBF SO-8 S8 C 05-08-1610 (S8) Yes
LTC1550LCS8#TRPBF SO-8 S8 C 05-08-1610 (S8) Yes
LTC1550LIGN#PBF SSOP-16 GN I 05-08-1641 (GN16) Yes
LTC1550LIGN#TRPBF SSOP-16 GN I 05-08-1641 (GN16) Yes


LTC1550L Package Drawing
LTC1550L Package Drawing
LTC1550L 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
LTC1550LCGN#PBF SSOP-16 C $2.25 $1.90 Yes
LTC1550LCGN#TRPBF SSOP-16 C $1.96 Yes
LTC1550LCMS8-2.5#PBF MS-8 C $2.25 $1.90 Yes
LTC1550LCMS8-2.5#TRPBF MS-8 C $1.96 Yes
LTC1550LCMS8-2#PBF MS-8 C $2.25 $1.90 Yes
LTC1550LCMS8-2#TRPBF MS-8 C $1.96 Yes
LTC1550LCMS8-4.1#PBF MS-8 C $2.25 $1.90 Yes
LTC1550LCMS8-4.1#TRPBF MS-8 C $1.96 Yes
LTC1550LCMS8#PBF MS-8 C $2.25 $1.90 Yes
LTC1550LCMS8#TRPBF MS-8 C $1.96 Yes
LTC1550LCS8-2.5#PBF SO-8 C $2.00 $1.70 Yes
LTC1550LCS8-2.5#TRPBF SO-8 C $1.76 Yes
LTC1550LCS8-2#PBF SO-8 C $2.00 $1.70 Yes
LTC1550LCS8-2#TRPBF SO-8 C $1.76 Yes
LTC1550LCS8-4.1#PBF SO-8 C $2.00 $1.70 Yes
LTC1550LCS8-4.1#TRPBF SO-8 C $1.76 Yes
LTC1550LCS8#PBF SO-8 C $2.00 $1.70 Yes
LTC1550LCS8#TRPBF SO-8 C $1.76 Yes
LTC1550LIGN#PBF SSOP-16 I $2.65 $2.25 Yes
LTC1550LIGN#TRPBF SSOP-16 I $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.

Part Number Description Price Documentation
DC092A-A LTC1550LCS8 | -4.1V OUTPUT GaAs FET BIAS GENERATOR ACTIVE LOW SHUTDOWN $100.00
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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:
LTC1550
LTC1550CS8-4.1
LTC1550L
LTC1550LCS8
LTC1550LCS8-2
LTC1550LCS8-2.5
LTC1550LCS8-4.1

Technical Support