LT3472 - Boost and Inverting DC/DC Converter for CCD Bias

Features

  • Generates 15V at 20mA, –8V at 50mA from a
    Li-Ion Cell
  • Internal Schottky Diodes
  • VIN Range: 2.2V to 16V
  • Output Voltages Up to ±34V
  • Capacitor-Programmable Soft-Start
  • Sequencing: Positive Output Reaches 88% of Final Value Before Negative Output Begins
  • Requires Only One Resistor to Set Output Voltage
  • Constant Switching Frequency Ensures Low Noise Outputs
  • Available in a 10-Lead (3mm × 3mm) DFN Package

Typical Application

LT3472 Typical Application
LT3472 Typical Application

Description

The LT3472 dual channel switching regulator generates positive and negative outputs for biasing CCD imagers. The device delivers up to –8V at 50mA and 15V at 20mA from a lithium-ion cell, providing bias for many popular CCD imagers. Switching at 1.1MHz, the LT3472 uses tiny, low profile capacitors and inductors and generates low noise outputs that are easy to filter. Schottky diodes are internal and the output voltages are set with one resistor per channel, reducing external component count. The entire solution is less than 1mm profile and occupies just 50mm2.

Internal sequencing circuitry disables the negative channel until the positive channel has reached 88% of its final value, ensuring that the sum of the two outputs is always positive. Separate soft-start capacitors for each output allow the ramp of each output to be independently controlled.

The LT3472 is available in a low profile (0.75mm) 10-pin 3mm × 3mm DFN package.

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
LT3472EDD#PBF 3x3 DFN-10 DD E 05-08-1699 Yes
LT3472EDD#TRPBF 3x3 DFN-10 DD E 05-08-1699 Yes


LT3472 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
LT3472EDD#PBF 3x3 DFN-10 E $2.31 $1.95 Yes
LT3472EDD#TRPBF 3x3 DFN-10 E $2.15 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
DC760A LT3472EDD | Boost and Inverting DC/DC Converters, Vin = 2.7V - 4.2V, Vout1 = 15V @ 25mA-45mA, Vout2 = -8V @ 35mA-65mA $100.00
Buy Now
Click here to view our complete list of demo boards

Applications

  • CCD Bias
  • TFT LCD Bias
  • OLED Bias
  • ± Rail Generation for Op Amps

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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:
LT3472

Technical Support