LTC3850
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LTC3850

Dual, 2-Phase Synchronous Step-Down Switching Controller

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LTspice LTC3850 Demo Circuit - Dual, 2-Phase Synchronous step-down Controller (12V to 2.5V @ 10A & 1.2V @ 10A) Download 9.00KB LTspice LTC3850 - Step-Down (Buck) Regulators Download 6.22 KB
Part Models 24
1ku List Price Starting From $2.90
Features
  • Dual, 180° Phased Controllers Reduce Required Input Capacitance and Power Supply Induced Noise
  • High Efficiency: Up to 95%
  • RSENSE or DCR Current Sensing
  • ±1% 0.8V Output Voltage Accuracy
  • Phase-Lockable Fixed Frequency 250kHz to 780kHz
  • Supports Pre-Biased Output
  • Dual N-Channel MOSFET Synchronous Drive
  • Wide VIN Range: 4V to 24V (30V for LTC3850I) Operation
  • Adjustable Soft-Start Current Ramping or Tracking
  • Foldback Output Current Limiting
  • Power Good Output Voltage Monitor
  • 28-Pin 4mm × 4mm, 4mm × 5mm QFN and Narrow SSOP Packages
  • AEC-Q100 Qualified for Automotive Applications
Additional Details
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The LTC3850 is a high performance dual synchronous step-down switching regulator controller that drives all N-channel power MOSFET stages. A constant-frequency current mode architecture allows a phase-lockable frequency of up to 780kHz. Power loss and supply noise are minimized by operating the two controller output stages out of phase.

OPTI-LOOP® compensation allows the transient response to be optimized over a wide range of output capacitance and ESR values. The LTC3850 features a precision 0.8V reference and a power good output indicator. A wide 4V to 24V (28V maximum/30V for LTC3850I) input supply range encompasses most battery chemistries and intermediate bus voltages.

Independent TK/SS pins for each controller ramp the output voltages during start-up. Current foldback limits MOSFET heat dissipation during short-circuit conditions. The MODE/PLLIN pin selects among Burst Mode® operation, pulse-skipping mode, or continuous inductor current mode and allows the IC to be synchronized to an external clock.

The LTC3850 is available in low profile 28-pin 4mm × 4mm, 4mm × 5mm QFN and narrow SSOP packages.


 Features
LTC3850 SSOP-28 and QFN-28 Packages
LTC3850-1 ILIM function replaced with an EXTVCC function, SSOP-28 package only
LTC3850-2 The LTC3850-2 is identical to the LTC3850-1 SSOP-28, except they have different pin-outs

Applications

  • Notebook and Palmtop Computers
  • Portable Instruments
  • Battery-Operated Digital Devices
  • DC Power Distribution Systems
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file View Data Sheet (Rev.D)
Documentation View All Documentation
LTspice LTC3850 Demo Circuit - Dual, 2-Phase Synchronous step-down Controller (12V to 2.5V @ 10A & 1.2V @ 10A) Download 9.00KB LTspice LTC3850 - Step-Down (Buck) Regulators Download 6.22 KB
Part Models 24
1ku List Price Starting From $2.90
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LTC3850

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Data Sheet

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UPDATED 03/04/2011
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LTC3850: Dual, 2-Phase Synchronous Step-Down Switching Controller Data Sheet (Rev.D)

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UPDATED 08/26/2008
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LTC3850: デュアル、2フェーズ、同期整流式降圧スイッチング・コントローラ データシート

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User Guide

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UPDATED 12/17/2013
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DC1185B - Demo Manual redirect icon

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UPDATED 03/07/2011
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DC1185A - Demo Manual redirect icon

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UPDATED 09/24/2009
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DC1231A - Demo Manual redirect icon

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UPDATED 09/24/2009
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DC1126A - Demo Manual redirect icon

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Reliability Data

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UPDATED 03/26/2018
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R526 Reliability Data redirect icon

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Technical Articles

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UPDATED 04/01/2010
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6mm × 6mm DC/DC Controller for High Current DCR Sensing Applications redirect icon

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UPDATED 10/01/2011
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3-Phase Synchronous Step-Down DC/DC Controller with Stage Shedding, Active Voltage Positioning and Nonlinear Control for High Efficiency and Fast Transient Response redirect icon

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UPDATED 10/01/2007
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2-Phase Synchronous Buck Controller Delivers Maximum Features in Minimum Footprint redirect icon

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Documentation

Technical Documents 9
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Data Sheet 1

LTC3850: Dual, 2-Phase Synchronous Step-Down Switching Controller Data Sheet (Rev.D)

Reliability Data 1

R526 Reliability Data

User Guide 4

DC1185B - Demo Manual
DC1185A - Demo Manual
DC1231A - Demo Manual
DC1126A - Demo Manual

Technical Articles 3

6mm × 6mm DC/DC Controller for High Current DCR Sensing Applications
3-Phase Synchronous Step-Down DC/DC Controller with Stage Shedding, Active Voltage Positioning and Nonlinear Control for High Efficiency and Fast Transient Response
2-Phase Synchronous Buck Controller Delivers Maximum Features in Minimum Footprint

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2017-09-18

Voltage vs. Current Mode Control Curent Sharing in a PolyPhase DC/DC Converter - LTC3731, LTC3853, LTC3850

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ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.

Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
LTC3850EGN#PBF 28-Lead SSOP (Narrow 0.15 Inch) external-link
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LTC3850EUFD#TRPBF 28-Lead QFN (4mm x 5mm x 0.75mm w/ EP) external-link
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LTC3850IGN#PBF 28-Lead SSOP (Narrow 0.15 Inch) external-link
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LTC3850IGN#WPBF 28-Lead SSOP (Narrow 0.15 Inch) external-link
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LTC3850IGN#WTRPBF 28-Lead SSOP (Narrow 0.15 Inch) external-link
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LTC3850IGN-1#PBF 28-Lead SSOP (Narrow 0.15 Inch) external-link
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LTC3850IGN-1#TRPBF 28-Lead SSOP (Narrow 0.15 Inch) external-link
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LTC3850IGN-1#WPBF 28-Lead SSOP (Narrow 0.15 Inch) external-link
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LTC3850IGN-1#WTRPBF 28-Lead SSOP (Narrow 0.15 Inch) external-link
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LTC3850IUF#PBF 28-Lead QFN (4mm x 4mm x 0.75mm w/ EP) external-link
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LTC3850IUF#TRPBF 28-Lead QFN (4mm x 4mm x 0.75mm w/ EP) external-link
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LTC3850IUFD#PBF 28-Lead QFN (4mm x 5mm x 0.75mm w/ EP) external-link
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LTC3850IUFD#TRPBF 28-Lead QFN (4mm x 5mm x 0.75mm w/ EP) external-link
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Laser Top Mark Conversion for QSOP20_24_28 Assembled in ADPG [PNG] and UTL

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Jul 31, 2020

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Notification of Wafer Fab Location Change for 0.6µm BICMOS Process Devices from ADI Milpitas (Hillview) to Vanguard Int. (Taiwan)

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Oct 3, 2024

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(QSOP/SSOP PKG) Migrating Bottom Trace Code Marking to Top Side Laser Marking

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Laser Top Mark Conversion for QSOP20_24_28 Assembled in ADPG [PNG] and UTL

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Notification of Wafer Fab Location Change for 0.6µm BICMOS Process Devices from ADI Milpitas (Hillview) to Vanguard Int. (Taiwan)

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Oct 3, 2024

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(QSOP/SSOP PKG) Migrating Bottom Trace Code Marking to Top Side Laser Marking

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Evaluation Kits 6

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DC1185A-A

LTC3850EUF Demo Board | 4.5V ≤ VIN ≤ 14V; VOUT1: 2V @ 10A, VOUT2: 1.8V @ 10A

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DC1185A-A

LTC3850EUF Demo Board | 4.5V ≤ VIN ≤ 14V; VOUT1: 2V @ 10A, VOUT2: 1.8V @ 10A

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DC1185A-A
LTC3850EUF Demo Board | 4.5V ≤ VIN ≤ 14V; VOUT1: 2V @ 10A, VOUT2: 1.8V @ 10A
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Demonstration circuit 1185 is a dual phase/dual output synchronous buck converter featuring the LTC3850EUF. The demo board comes in two versions. The output voltages for version -A are 2.0V/10A and 1.8V/10A and the output voltages for version -B are 1.5V/15A and 1.2V/15A. The input voltage range is 6.5V to 14V for both versions. For applications that have a 5V ±0.5V input, the board has an optional resistor to tie the INTVCC pin to the VIN pin.

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DC1185A - Design Files Download

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DC1185A - Demo Manual Download

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DC1185A - Schematic Download

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DC1231A-A

LTC3850EGN Demo Board | 6.5V < VIN < 24V, VOUT1 = 3.3V/5A, VOUT2 = 2.5V/5A

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DC1231A-A

LTC3850EGN Demo Board | 6.5V < VIN < 24V, VOUT1 = 3.3V/5A, VOUT2 = 2.5V/5A

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DC1231A-A
LTC3850EGN Demo Board | 6.5V < VIN < 24V, VOUT1 = 3.3V/5A, VOUT2 = 2.5V/5A
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Demonstration circuit 1231A is a Dual Output, Dual Phase 5A Synchronous Buck Converter featuring the LTC3850EGN. The entire circuit, including the bulk output capacitors, fit within a 1.04” × 0.94” area on all layers. The package style for the LTC3850EGN is a 28-lead narrow plastic SSOP. The main features of the board include rail tracking, an internal 5V linear regulator for bias, RUN pins for each output and a PGOOD signal and a Mode selector that allow the converter to run in CCM, pulse skip or Burst Mode operation. Synchronization to an external clock is also possible through some minor component changes. Two versions of the board are available. DC-1231A-A has an on-board sense resistor for current feedback, while the DC1231A-B is configured with a DCR sense circuit that allows the converter to use the inductor’s DCR as the sense element instead of the on-board sense resistors to save cost and board space and improves efficiency.


 


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DC1231A - Demo Manual Download

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DC1231A - Schematic Download

37.00K

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DC1231A - Design File Download

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DC1231A-B

LTC3850EGN Demo Board | 6.5V < VIN < 24V, VOUT1 = 3.3V/5A, VOUT2 = 2.5V/5A, with DCR Current Sense

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DC1231A-B

LTC3850EGN Demo Board | 6.5V < VIN < 24V, VOUT1 = 3.3V/5A, VOUT2 = 2.5V/5A, with DCR Current Sense

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DC1231A-B
LTC3850EGN Demo Board | 6.5V < VIN < 24V, VOUT1 = 3.3V/5A, VOUT2 = 2.5V/5A, with DCR Current Sense
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Product Detail

Demonstration circuit 1231A is a Dual Output, Dual Phase 5A Synchronous Buck Converter featuring the LTC3850EGN. The entire circuit, including the bulk output capacitors, fit within a 1.04” × 0.94” area on all layers. The package style for the LTC3850EGN is a 28-lead narrow plastic SSOP. The main features of the board include rail tracking, an internal 5V linear regulator for bias, RUN pins for each output and a PGOOD signal and a Mode selector that allow the converter to run in CCM, pulse skip or Burst Mode operation. Synchronization to an external clock is also possible through some minor component changes. Two versions of the board are available. DC-1231A-A has an on-board sense resistor for current feedback, while the DC1231A-B is configured with a DCR sense circuit that allows the converter to use the inductor’s DCR as the sense element instead of the on-board sense resistors to save cost and board space and improves efficiency.


 


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DC1231A - Demo Manual Download

192.00K

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DC1231A - Schematic Download

37.00K

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DC1231A - Design File Download

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DC1126A

LTC3850EUF Demo Board | 6.5V ≤ VIN ≤ 14V, VOUT = 3.3V @ 5A & 2.5V @ 5A

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DC1126A

LTC3850EUF Demo Board | 6.5V ≤ VIN ≤ 14V, VOUT = 3.3V @ 5A & 2.5V @ 5A

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DC1126A
LTC3850EUF Demo Board | 6.5V ≤ VIN ≤ 14V, VOUT = 3.3V @ 5A & 2.5V @ 5A
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Product Detail

Demonstration circuit 1126 is a high density dual output (3.3V/5A and 2.5V/5A) step down converter featuring the LTC3850EUF. The input voltage range is 6.5V to 14V. For applications that have a 5V +/- 0.5V input, the board has an optional resistor to tie the INTVCC pin to the VIN pin.


An optional DCR sense circuit allows the converter to use the inductor’s DCR as the sense element instead of the on-board sense resistors to save cost and board space and to improve efficiency.


 


Resources

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DC1126A - Demo Manual Download

501.00K

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DC1126A - Design File Download

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DC1126A - Schematic Download

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DC1185B-B

LTC3850EUF Demo Board | 4.5V ≤ VIN ≤ 14V; VOUT1: 1.5V @ 15A, VOUT2: 1.2V @ 15A

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DC1185B-B

LTC3850EUF Demo Board | 4.5V ≤ VIN ≤ 14V; VOUT1: 1.5V @ 15A, VOUT2: 1.2V @ 15A

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DC1185B-B
LTC3850EUF Demo Board | 4.5V ≤ VIN ≤ 14V; VOUT1: 1.5V @ 15A, VOUT2: 1.2V @ 15A
Buy Now View Details

Product Detail

Demonstration circuit 1185 is a dual phase/dual output synchronous buck converter featuring the LTC3850EUF. The demo board comes in two versions. The output voltages for version -A are 2.0V/10A and 1.8V/10A and the output voltages for version -B are 1.5V/15A and 1.2V/15A. The input voltage range is 6.5V to 14V for both versions. For applications that have a 5V ± 0.5V input, the board has an optional resistor to tie the INTVCC pin to the VIN pin.

Resources

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DC1185B - Schematic Download

49.00K

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DC1185B - Demo Manual Download

426.00K

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DC1185B - Design Files Download

1.00M

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DC1185B-A

LTC3850EUF Demo Board | 4.5V ≤ VIN ≤ 14V; VOUT1: 2V @ 10A, VOUT2: 1.8V @ 10A

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DC1185B-A

LTC3850EUF Demo Board | 4.5V ≤ VIN ≤ 14V; VOUT1: 2V @ 10A, VOUT2: 1.8V @ 10A

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DC1185B-A
LTC3850EUF Demo Board | 4.5V ≤ VIN ≤ 14V; VOUT1: 2V @ 10A, VOUT2: 1.8V @ 10A
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Product Detail

Demonstration circuit 1185 is a dual phase/dual output synchronous buck converter featuring the LTC3850EUF. The demo board comes in two versions. The output voltages for version -A are 2.0V/10A and 1.8V/10A and the output voltages for version -B are 1.5V/15A and 1.2V/15A. The input voltage range is 6.5V to 14V for both versions. For applications that have a 5V ±0.5V input, the board has an optional resistor to tie the INTVCC pin to the VIN pin.

Resources

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DC1185B - Schematic Download

49.00K

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DC1185B - Demo Manual Download

426.00K

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ZIP

DC1185B - Design Files Download

1.00M

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Evaluation Kits6

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DC1185A-A

LTC3850EUF Demo Board | 4.5V ≤ VIN ≤ 14V; VOUT1: 2V @ 10A, VOUT2: 1.8V @ 10A
evaluation kit item images

DC1231A-A

LTC3850EGN Demo Board | 6.5V < VIN < 24V, VOUT1 = 3.3V/5A, VOUT2 = 2.5V/5A
evaluation kit item images

DC1231A-B

LTC3850EGN Demo Board | 6.5V < VIN < 24V, VOUT1 = 3.3V/5A, VOUT2 = 2.5V/5A, with DCR Current Sense
evaluation kit item images

DC1126A

LTC3850EUF Demo Board | 6.5V ≤ VIN ≤ 14V, VOUT = 3.3V @ 5A & 2.5V @ 5A
evaluation kit item images

DC1185B-B

LTC3850EUF Demo Board | 4.5V ≤ VIN ≤ 14V; VOUT1: 1.5V @ 15A, VOUT2: 1.2V @ 15A
evaluation kit item images

DC1185B-A

LTC3850EUF Demo Board | 4.5V ≤ VIN ≤ 14V; VOUT1: 2V @ 10A, VOUT2: 1.8V @ 10A

Tools & Simulations 2

LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.

To launch ready-to-run LTspice demonstration circuits for this part:

Step 1: Download and install LTspice on your computer.

Step 2: Click on the link in the section below to download a demonstration circuit.

Step 3: If LTspice does not automatically open after clicking the link below, you can instead run the simulation by right clicking on the link and selecting “Save Target As.” After saving the file to your computer, start LTspice and open the demonstration circuit by selecting ‘Open’ from the ‘File’ menu.

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LTC3850 Demo Circuit - Dual, 2-Phase Synchronous step-down Controller (12V to 2.5V @ 10A & 1.2V @ 10A) Download

9.00K

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LTC3850 - Step-Down (Buck) Regulators Download

6.22 K

Reference Designs 1

DK-DEV-4CGX150N FPGA Development Kit

Altera Cyclone IV GX FPGA Development Kit

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Altera Cyclone IV GX FPGA Development Kit

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Altera Cyclone IV GX FPGA Development Kit

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View Detailed Reference Design external link

Part Used 4

LTC3026 reference design link

LT3027 reference design link

LTC3850 reference design link

LTC3853 reference design link

Reference Designs1

DK-DEV-4CGX150N FPGA Development Kit

Altera Cyclone IV GX FPGA Development Kit

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