LTC3265 - Low Noise Dual Supply with Boost and Inverting Charge Pumps

Features

  • Boost Charge Pump Generates 2 • VIN_P (VIN_P Range: 4.5V to 16V)
  • Inverting Charge Pump Generates –VIN_N (VIN_N Range: 4.5V to 32V)
  • Low Noise Positive LDO Post Regulator Up to 50mA
  • Low Noise Negative LDO Post Regulator Up to 50mA
  • 135μA Quiescent Current in Burst Mode® Operation with Both LDO Regulators On
  • 50kHz to 500kHz Programmable Oscillator Frequency
  • Stable with Ceramic Capacitors
  • Short-Circuit/Thermal Protection
  • Low Profile 3mm × 5mm 18-Lead DFN and Thermally Enhanced 20-Lead TSSOP Packages

Typical Application

LTC3265 Typical Application
LTC3265 Typical Application

Description

The LTC®3265 is a low noise dual polarity output power supply including a boost charge pump, an inverting charge pump and two low noise positive and negative LDO post regulators. The boost charge pump powers the positive LDO post regulator while the inverting charge pump powers the negative LDO regulator. Each LDO can provide up to 50mA of output current. The LDO output voltages can be adjusted using external resistor dividers.

The charge pumps employ low quiescent current Burst Mode operation or low noise constant frequency mode. During Burst Mode operation, the boost charge pump regulates its output (VOUT +) to 0.94 • 2 • VIN_P while the inverting charge pump regulates its output (VOUT ) to –0.94 • VIN_N. In Burst Mode operation the LTC3265 draws only 135μA of quiescent current with both LDOs on. In constant frequency mode, the boost and inverting charge pumps produce outputs equal to 2 • VIN_P and –VIN_N respectively and operate at a fixed 500kHz or to a programmed value between 50kHz to 500kHz using an external resistor. The LTC3265 is available in low profile 3mm × 5mm × 0.75mm 18-lead DFN and thermally enhanced 20-lead TSSOP packages.

Packaging

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

Part Number Package Code Temp Package
Drawing
RoHS
LTC3265EDHC#PBF 5x3 DFN-18 DHC E 05-08-1955 Yes
LTC3265EDHC#TRPBF 5x3 DFN-18 DHC E 05-08-1955 Yes
LTC3265EFE#PBF TSSOP-20 FE E 05-08-1663 (CA) Yes
LTC3265EFE#TRPBF TSSOP-20 FE E 05-08-1663 (CA) Yes
LTC3265HDHC#PBF 5x3 DFN-18 DHC H 05-08-1955 Yes
LTC3265HDHC#TRPBF 5x3 DFN-18 DHC H 05-08-1955 Yes
LTC3265HFE#PBF TSSOP-20 FE H 05-08-1663 (CA) Yes
LTC3265HFE#TRPBF TSSOP-20 FE H 05-08-1663 (CA) Yes
LTC3265IDHC#PBF 5x3 DFN-18 DHC I 05-08-1955 Yes
LTC3265IDHC#TRPBF 5x3 DFN-18 DHC I 05-08-1955 Yes
LTC3265IFE#PBF TSSOP-20 FE I 05-08-1663 (CA) Yes
LTC3265IFE#TRPBF TSSOP-20 FE I 05-08-1663 (CA) Yes
LTC3265MPDHC#PBF 5x3 DFN-18 DHC MP 05-08-1955 Yes
LTC3265MPDHC#TRPBF 5x3 DFN-18 DHC MP 05-08-1955 Yes
LTC3265MPFE#PBF TSSOP-20 FE MP 05-08-1663 (CA) Yes
LTC3265MPFE#TRPBF TSSOP-20 FE MP 05-08-1663 (CA) Yes


LTC3265 Package Drawing
LTC3265 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
LTC3265EDHC#PBF 5x3 DFN-18 E $5.43 $3.80 Yes
LTC3265EDHC#TRPBF 5x3 DFN-18 E $3.86 Yes
LTC3265EFE#PBF TSSOP-20 E $5.43 $3.80 Yes
LTC3265EFE#TRPBF TSSOP-20 E $3.86 Yes
LTC3265HDHC#PBF 5x3 DFN-18 H $6.71 $4.70 Yes
LTC3265HDHC#TRPBF 5x3 DFN-18 H $4.76 Yes
LTC3265HFE#PBF TSSOP-20 H $6.71 $4.70 Yes
LTC3265HFE#TRPBF TSSOP-20 H $4.76 Yes
LTC3265IDHC#PBF 5x3 DFN-18 I $6.24 $4.37 Yes
LTC3265IDHC#TRPBF 5x3 DFN-18 I $4.43 Yes
LTC3265IFE#PBF TSSOP-20 I $6.24 $4.37 Yes
LTC3265IFE#TRPBF TSSOP-20 I $4.43 Yes
LTC3265MPDHC#PBF 5x3 DFN-18 MP $14.66 $10.26 Yes
LTC3265MPDHC#TRPBF 5x3 DFN-18 MP $10.32 Yes
LTC3265MPFE#PBF TSSOP-20 MP $14.66 $10.26 Yes
LTC3265MPFE#TRPBF TSSOP-20 MP $10.32 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
DC2235A LTC3265 Demo Board | Dual Supply Boost/Inverting Charge Pumps with Post-Regulator LDOs, 4.5V ≤ VIN ≤ 16V, Vout = ±5V/±15V/±24V @ 50mA $150.00
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Click here to view our complete list of demo boards

Applications

  • Low Noise Bipolar/Inverting Supplies
  • Industrial/Instrumentation Low Noise Bias Generators

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Design Tools

LTspice

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Models for the following parts are available in LTspice:
LTC3265

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