LTC3826 - 30µA IQ, Dual, 2-Phase Synchronous Step-Down Controller

Features

  • Wide Output Voltage Range: 0.8V ≤ VOUT ≤ 10V
  • Ultralow Operating IQ: 30µA (One Channel On)
  • Out-of-Phase Controllers Reduce Required Input Capacitance and Power Supply Induced Noise
  • OPTI-LOOP Compensation Minimizes COUT
  • ±1% Output Voltage Accuracy
  • Wide VIN Range: 4V to 36V Operation
  • Phase-Lockable Fixed Frequency 140kHz to 650kHz
  • Selectable Continuous, Pulse Skipping or Low Ripple Burst Mode Operation at Light Loads
  • Dual N-Channel MOSFET Synchronous Drive
  • Very Low Dropout Operation: 99% Duty Cycle
  • Adjustable Output Voltage Soft-Start or Tracking
  • Output Current Foldback Limiting
  • Power Good Output Voltage Monitor
  • Output Overvoltage Protection
  • Low Shutdown IQ: 4µA
  • Internal LDO Powers Gate Drive from VIN or VOUT
  • Small 5mm × 5mm QFN Package
Designed for Automotive and Transportation Applications
AEC-Q100 data available for specific packages


Typical Application

LTC3826 Typical Application
LTC3826 Typical Application

Description

The LTC3826 is a high performance dual step-down switching regulator controller that drives all N-channel synchronous power MOSFET stages. A constant frequency current mode architecture allows a phase-lockable frequency of up to 650kHz. Power loss and noise due to the ESR of the input capacitor are minimized by operating the two controller output stages out of phase.

The 30μA no-load quiescent current extends operating life in battery powered systems. OPTI-LOOP compensation allows the transient response to be optimized over a wide range of output capacitance and ESR values. The LTC3826 features a precision 0.8V reference and a power good output indicator. A wide 4V to 36V input supply range encompasses all battery chemistries.

Independent TRACK/SS pins for each controller ramp the output voltage during start-up. Current foldback limits MOSFET heat dissipation during short-circuit conditions.

The PLLIN/MODE pin selects among Burst Mode operation, pulse skipping mode, or continuous inductor current mode at light loads. For a leaded package version (28-lead SSOP), see the LTC3826-1 data sheet.

  PGOOD
PolyPhase
Defeatable Current Foldback
Package
LTC3826 2 Yes  Yes  QFN-32
LTC3826-1 1 No  No  SSOP-28

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
LTC3826EUH#PBF 5x5 QFN-32 UH E 05-08-1693 Yes
LTC3826EUH#TRPBF 5x5 QFN-32 UH E 05-08-1693 Yes
LTC3826IUH#PBF 5x5 QFN-32 UH I 05-08-1693 Yes
LTC3826IUH#TRPBF 5x5 QFN-32 UH I 05-08-1693 Yes


LTC3826 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
LTC3826EUH#PBF 5x5 QFN-32 E $7.86 $5.50 Yes
LTC3826EUH#TRPBF 5x5 QFN-32 E $5.56 Yes
LTC3826IUH#PBF 5x5 QFN-32 I $7.99 $5.59 Yes
LTC3826IUH#TRPBF 5x5 QFN-32 I $5.65 Yes
Buy NowRequest Samples
* 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
DC1235A LTC3826EG| 30uA IQ, Dual, 2-Phase Synchronous Step-Down Controller Contact Factory
Buy Now
Click here to view our complete list of demo boards

Designed for Automotive and Transportation Applications

AEC-Q100 data is available for these specific part numbers. Please contact your local sales representative for more information regarding reliability reports or to inquire about parts that are not included. For more information, view our Automotive and Transportation page

Part Number Package Temp Price
(1-99)
Price
(1k)*
RoHS
LTC3826IUH#PBF 5x5 QFN-32 I $7.99 $5.59 Yes
LTC3826IUH#TRPBF 5x5 QFN-32 I $5.65 Yes
Buy NowRequest Samples
* 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.

Applications

  • Automotive Systems
  • Battery-Operated Digital Devices
  • Distributed DC Power Systems

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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

To launch a ready to run LTspice demonstration circuit for this part:

To explore other ready to run LTspice demonstration circuits, please visit our Demo Circuits Collection.

Models for the following parts are available in LTspice:
LTC3826
LTC3826-1

Technical Support