LT8415 - Ultralow Power Boost Converter with Dual Half-Bridge Switches

Features

  • High Voltage Switches Built in (Dual half-bridge)
  • Ultralow Quiescent Current
    10.5μA in Active Mode
    0μA in Shutdown Mode
  • Comparator Built into SHDN pin
  • Low Noise Control Scheme
  • Adjustable FB reference voltage
  • Wide Input Range: 2.5V to 16V
  • Wide Output Range: Up to 40V
  • Integrated Power NPN Switch (25mA Current Limit)
  • Integrated Schottky Diode
  • Integrated Output Disconnect
  • High Value (12.4M/0.4M) Feedback Resistor Integrated
  • Built in Soft Start (Optional Capacitor from VREF to GND)
  • Over Voltage Protection for CAP, VOUT, OUT1 and OUT2 Pins
  • 12-Pin 3mm × 2mm DFN package

Typical Application

LT8415 Typical Application
LT8415 Typical Application

Description

The LT8415 is an ultralow power boost converter with two integrated complementary MOSFET half-bridges (N- and P-channel), integrated power switch, Schottky diode and output disconnect circuitry. The N-channel and P-channel MOSFETs in each half-bridge are synchronously controlled by a single input pin, and never turn on at the same time in typical applications.

The boost regulator controls power delivery by varying both the peak inductor current and switch off-time. This control scheme results in low output voltage ripple as well as high efficiency over a wide load range. The quiescent current is a low 10.5μA, which is further reduced to 0μA in shutdown. The internal disconnect circuitry allows the output voltage to be blocked from the input during shutdown. High value (12.4M/0.4M) resistors are integrated on chip for output voltage detection, significantly reducing input referred quiescent current. The LT8415 also features a comparator built into the SHDN pin, overvoltage protection for the CAP, VOUT, OUT1 and OUT2 pins, built in soft start and comes in a tiny 12-pin 3mm × 2mm 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
LT8415EDDB#PBF 3x2 DFN-12 DDB E 05-08-1723 Yes
LT8415EDDB#TRMPBF 3x2 DFN-12 DDB E 05-08-1723 Yes
LT8415EDDB#TRPBF 3x2 DFN-12 DDB E 05-08-1723 Yes
LT8415IDDB#PBF 3x2 DFN-12 DDB I 05-08-1723 Yes
LT8415IDDB#TRMPBF 3x2 DFN-12 DDB I 05-08-1723 Yes
LT8415IDDB#TRPBF 3x2 DFN-12 DDB I 05-08-1723 Yes


LT8415 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
LT8415EDDB#PBF 3x2 DFN-12 E $3.43 Yes
LT8415EDDB#TRMPBF 3x2 DFN-12 E $3.43 $2.45 Yes
LT8415EDDB#TRPBF 3x2 DFN-12 E $3.43 $2.40 Yes
LT8415IDDB#PBF 3x2 DFN-12 I $3.43 Yes
LT8415IDDB#TRMPBF 3x2 DFN-12 I $3.94 $2.81 Yes
LT8415IDDB#TRPBF 3x2 DFN-12 I $3.94 $2.76 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
DC1449A LT8415EDDB Demo board |Ultralow Power Boost Converter with Dual Half-Bridge Switches $75.00
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Click here to view our complete list of demo boards

Applications

  • Sensor Power
  • RF Mems Relay Power
  • Low Power Actuator Bias/Control
  • Liquid Lens Driver

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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

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Models for the following parts are available in LTspice:
LT8415

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