LTC3892 - 60V Low IQ, Dual, 2-Phase Synchronous Step-Down DC/DC Controller
Features
- Wide VIN Range: 4.5V to 60V (65V Abs Max)
- Wide Output Voltage Range: 0.8V ≤ VOUT ≤ 99% • VIN
- Adjustable Gate Drive Level 5V to 10V (OPTI-DRIVE)
- No External Bootstrap Diodes Required
- Low Operating IQ: 29μA (One Channel On)
- Selectable Gate Drive UVLO Thresholds
- Out-of-Phase Operation Reduces Required Input Capacitance and Power Supply Induced Noise
- Phase-Lockable Frequency: 75kHz to 850kHz
- Selectable Continuous, Pulse Skipping or Low Ripple Burst Mode® Operation at Light Loads
- Selectable Current Limit (LTC3892/LTC3892-2)
- Very Low Dropout Operation: 99% Duty Cycle
- Power Good Output Voltage Monitors (LTC3892/LTC3892-2)
- Low Shutdown IQ: 3.6μA
- Small 32-Lead 5mm × 5mm QFN Package (LTC3892/ LTC3892-2) or TSSOP Package (LTC3892-1)
AEC-Q100 data available for specific packages
Typical Application
Description
The LTC®3892/LTC3892-1/LTC3892-2 is a high performance dual step-down DC/DC switching regulator controller that drives all N-channel synchronous power MOSFET stages. Power loss and noise are minimized by operating the two controller output stages out-of-phase.
The gate drive voltage can be programmed from 5V to 10V to allow the use of logic or standard-level FETs and to maximize efficiency. Internal switches in the top gate drivers eliminate the need for external bootstrap diodes.
A wide 4.5V to 60V input supply range encompasses a wide range of intermediate bus voltages and battery chemistries. Output voltages up to 99% of VIN can be regulated. OPTILOOP® compensation allows the transient response and loop stability to be optimized over a wide range of output capacitance and ESR values.
The 29μA no-load quiescent current extends operating run time in battery powered systems. For a comparision of the LTC3892 to the LTC3892-1 and LTC3892-2, see Table 1 in the Pin Functions section of this data sheet.
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 |
|---|---|---|---|---|---|
| LTC3892EFE-1#PBF | TSSOP-28 | FE | E | 05-08-1663 (EA) | Yes |
| LTC3892EFE-1#TRPBF | TSSOP-28 | FE | E | 05-08-1663 (EA) | Yes |
| LTC3892EUH-2#PBF | 5x5 QFN-32 | UH | E | 05-08-1693 | Yes |
| LTC3892EUH-2#TRPBF | 5x5 QFN-32 | UH | E | 05-08-1693 | Yes |
| LTC3892EUH#PBF | 5x5 QFN-32 | UH | E | 05-08-1693 | Yes |
| LTC3892EUH#TRPBF | 5x5 QFN-32 | UH | E | 05-08-1693 | Yes |
| LTC3892HFE-1#PBF | TSSOP-28 | FE | H | 05-08-1663 (EA) | Yes |
| LTC3892HFE-1#TRPBF | TSSOP-28 | FE | H | 05-08-1663 (EA) | Yes |
| LTC3892HUH-2#PBF | 5x5 QFN-32 | UH | H | 05-08-1693 | Yes |
| LTC3892HUH-2#TRPBF | 5x5 QFN-32 | UH | H | 05-08-1693 | Yes |
| LTC3892HUH#PBF | 5x5 QFN-32 | UH | H | 05-08-1693 | Yes |
| LTC3892HUH#TRPBF | 5x5 QFN-32 | UH | H | 05-08-1693 | Yes |
| LTC3892IFE-1#PBF | TSSOP-28 | FE | I | 05-08-1663 (EA) | Yes |
| LTC3892IFE-1#TRPBF | TSSOP-28 | FE | I | 05-08-1663 (EA) | Yes |
| LTC3892IUH-2#PBF | 5x5 QFN-32 | UH | I | 05-08-1693 | Yes |
| LTC3892IUH-2#TRPBF | 5x5 QFN-32 | UH | I | 05-08-1693 | Yes |
| LTC3892IUH#PBF | 5x5 QFN-32 | UH | I | 05-08-1693 | Yes |
| LTC3892IUH#TRPBF | 5x5 QFN-32 | UH | I | 05-08-1693 | Yes |
| LTC3892MPFE-1#PBF | TSSOP-28 | FE | MP | 05-08-1663 (EA) | Yes |
| LTC3892MPFE-1#TRPBF | TSSOP-28 | FE | MP | 05-08-1663 (EA) | Yes |
| LTC3892MPUH-2#PBF | 5x5 QFN-32 | UH | MP | 05-08-1693 | Yes |
| LTC3892MPUH-2#TRPBF | 5x5 QFN-32 | UH | MP | 05-08-1693 | Yes |
| LTC3892MPUH#PBF | 5x5 QFN-32 | UH | MP | 05-08-1693 | Yes |
| LTC3892MPUH#TRPBF | 5x5 QFN-32 | UH | MP | 05-08-1693 | Yes |
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
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 |
|---|---|---|---|
| DC1998A | LTC3892EUHF Demo Board | Dual Sync Buck Controller, 6V ≤ VIN ≤ 60V; VOUT1 = 5V @ 8A, VOUT2 = 12V @ 5A | $175.00 | |
| DC2190A-A | LTC3892EFE-1 Demo Board | LTC3892-1(x2) 4-Phase Buck Controller, 16V ≤ VIN ≤ 55V; VOUT = 12V @ 60A | Contact Factory | |
| DC2190A-B | LTC3892EFE-1 Demo Board | 2-Phase Buck Controller, 16V ≤ VIN ≤ 55V; VOUT = 12V @ 30A | Contact Factory | |
| DC2493A | LTC3892EUH-2 Demo Board | 2-Phase Sync Buck Controller, 16V ≤ VIN ≤ 55V; VOUT = 12V @ 30A | $200.00 | |
| Buy Now | |||
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 pagesales office or authorized distributor.
Applications
- Automotive and Industrial Power Systems
- Distributed DC Power Systems
- High Voltage Battery Operated 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:
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To explore other ready to run LTspice demonstration circuits, please visit our Demo Circuits Collection.
Models for the following parts are available in LTspice:
LTC3892
LTC3892-1
LTpowerCAD
The LTpowerCAD design tool is a complete power supply design tool program that can significantly ease the tasks of power supply design. It guides users to a solution, selects power stage components, provides detailed power efficiency, shows quick loop bode plot stability and load transient analysis, and can export a final design to LTspice for simulation. Click here to download LTpowerCAD
Design tools for the following parts are available in LTpowerCAD:
LTC3892
LTC3892 Parallel
LTC3892-1
LTC3892-1 Parallel
LTC3892-2
LTC3892-2 Parallel
Technical Support
- For immediate technical assistance, contact your local sales office or distributor or call 1-800-4-LINEAR (US customers only) or 408-432-1900.
- For less urgent requests, please complete our Technical Support Request Form. Please allow 2-3 business days for reply.
