LTC3890-2
RECOMMENDED FOR NEW DESIGNS60V Low IQ, Dual, 2-Phase Synchronous Step-Down DC/DC Controller
- Part Models
- 14
- 1ku List Price
- Starting From $6.93
Overview
- Wide VIN Range: 4V to 60V (65V Abs Max)
- Low Operating IQ: 50µA (One Channel On)
- Wide Output Voltage Range: 0.8V ≤ VOUT ≤ 24V
- RSENSE or DCR Current Sensing
- Out-of-Phase Controllers Reduce Input Capacitance and Power Supply Induced Noise
- Phase-Lockable Frequency (75kHz to 850kHz)
- Programmable Fixed Frequency (50kHz to 900kHz)
- Selectable Continuous, Pulse-Skipping or Low Ripple Burst Mode® Operation at Light Loads
- Selectable Current Limit
- Very Low Dropout Operation: 99% Duty Cycle
- Adjustable Output Voltage Soft-Start or Tracking
- Power Good Output Voltage Monitors
- Low Shutdown IQ : < 14µA
- Internal LDO Powers Gate Drive from VIN or EXTVCC
- Small Low Profile (0.75mm) 5mm × 5mm QFN Package
- AEC-Q100 Qualified for Automotive Applications
The LTC3890-2 is a high performance dual step-down switching regulator DC/DC controller that drives all N-channel synchronous power MOSFET stages. A constant frequency current mode architecture allows a phase-lockable frequency of up to 850kHz. 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 50μA no-load quiescent current extends operating run time in battery-powered systems. OPTI-LOOP® compensation allows the transient response to be optimized over a wide range of output capacitance and ESR values. A wide 4V to 60V input supply range encompasses a wide range of intermediate bus voltages and battery chemistries.
Independent TRACK/SS pins for each controller ramp the output voltages during start-up. Current mode control limits the inductor current during short-circuit conditions. The PLLIN/MODE pin selects among Burst Mode operation, pulse-skipping mode, or continuous conduction mode at light loads. For versions with different and/or additional features, see the LTC3890 family summary, Table 1, in the Pin Functions section of this data sheet.
| LTC3890 | LTC3890-1 | LTC3890-2 | LTC3890-3 | |
| Adjustable Current Limit | Yes | No | Yes | No |
| CLKOUT/PHASMD for Multiphase Operation |
Yes | No | Yes | No |
| Number of PGood Outputs |
2 | 1 | 2 | 1 |
| OVP – Bottom Gate Crowbar |
Yes | Yes | No | No |
| Current Limit Foldback | Yes | Yes | No | No |
| Light Load Operation when Synced to External Clock |
Forced Continuous | Forced Continuous | Pulse Skipping | Pulse Skipping |
| SENSE Pins Common Mode Range |
Common Mode < 0.5V Requires VFB < 0.65V |
Common Mode < 0.5V Requires VFB < 0.65V |
Not Dependant on VFB. Easy to make a non-synchronous Boost or SEPIC |
Not Dependant on VFB. Easy to make a non-synchronous Boost or SEPIC |
| Package | 5X5 QFN-32 | SSOP-28 | 5X5 QFN-32 | SSOP-28 |
Applications
- Automotive Always-On Systems
- Battery Operated Digital Devices
- Distributed DC Power Systems
Documentation
Data Sheet 1
User Guide 1
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 |
|---|---|---|---|
| LTC3890EUH-2#PBF | 32-Lead QFN (5mm x 5mm x 0.75mm w/ EP) | ||
| LTC3890EUH-2#TRPBF | 32-Lead QFN (5mm x 5mm x 0.75mm w/ EP) | ||
| LTC3890EUH-2#WPBF | 32-Lead QFN (5mm x 5mm x 0.75mm w/ EP) | ||
| LTC3890EUH-2#WTRPBF | 32-Lead QFN (5mm x 5mm x 0.75mm w/ EP) | ||
| LTC3890HUH-2#PBF | 32-Lead QFN (5mm x 5mm x 0.75mm w/ EP) | ||
| LTC3890HUH-2#TRPBF | 32-Lead QFN (5mm x 5mm x 0.75mm w/ EP) | ||
| LTC3890HUH-2#WPBF | 32-Lead QFN (5mm x 5mm x 0.75mm w/ EP) | ||
| LTC3890HUH-2#WTRPBF | 32-Lead QFN (5mm x 5mm x 0.75mm w/ EP) | ||
| LTC3890IUH-2#PBF | 32-Lead QFN (5mm x 5mm x 0.75mm w/ EP) | ||
| LTC3890IUH-2#TRPBF | 32-Lead QFN (5mm x 5mm x 0.75mm w/ EP) | ||
| LTC3890IUH-2#WPBF | 32-Lead QFN (5mm x 5mm x 0.75mm w/ EP) | ||
| LTC3890IUH-2#WTRPBF | 32-Lead QFN (5mm x 5mm x 0.75mm w/ EP) | ||
| LTC3890MPUH-2#PBF | 32-Lead QFN (5mm x 5mm x 0.75mm w/ EP) | ||
| LTC3890MPUH-2#TRPBF | 32-Lead QFN (5mm x 5mm x 0.75mm w/ EP) |
| Part Models | Product Lifecycle | PCN |
|---|---|---|
|
Feb 14, 2025 - 25_0017 Bond Wire Change from Gold to Copper |
||
| LTC3890EUH-2#PBF | PRODUCTION | |
| LTC3890EUH-2#TRPBF | PRODUCTION | |
| LTC3890IUH-2#PBF | PRODUCTION | |
| LTC3890IUH-2#TRPBF | PRODUCTION | |
|
Jul 31, 2020 - 20_0245 Notification of Wafer Fab Location Change for 0.6µm BICMOS Process Devices from ADI Milpitas (Hillview) to Vanguard Int. (Taiwan) |
||
| LTC3890EUH-2#PBF | PRODUCTION | |
| LTC3890EUH-2#TRPBF | PRODUCTION | |
| LTC3890EUH-2#WPBF | PRODUCTION | |
| LTC3890EUH-2#WTRPBF | PRODUCTION | |
| LTC3890HUH-2#PBF | PRODUCTION | |
| LTC3890HUH-2#TRPBF | PRODUCTION | |
| LTC3890HUH-2#WPBF | PRODUCTION | |
| LTC3890HUH-2#WTRPBF | PRODUCTION | |
| LTC3890IUH-2#PBF | PRODUCTION | |
| LTC3890IUH-2#TRPBF | PRODUCTION | |
| LTC3890IUH-2#WPBF | PRODUCTION | |
| LTC3890IUH-2#WTRPBF | PRODUCTION | |
| LTC3890MPUH-2#PBF | PRODUCTION | |
| LTC3890MPUH-2#TRPBF | PRODUCTION | |
|
Apr 17, 2025 - 25_0043 Change of Gold to Copper Wire and BOM (Automotive) |
||
| LTC3890EUH-2#WPBF | PRODUCTION | |
| LTC3890EUH-2#WTRPBF | PRODUCTION | |
| LTC3890HUH-2#WPBF | PRODUCTION | |
| LTC3890HUH-2#WTRPBF | PRODUCTION | |
| LTC3890IUH-2#WPBF | PRODUCTION | |
| LTC3890IUH-2#WTRPBF | PRODUCTION | |
|
Apr 14, 2025 - 25_0017 Bond Wire Change from Gold to Copper |
||
| LTC3890EUH-2#WPBF | PRODUCTION | |
| LTC3890EUH-2#WTRPBF | PRODUCTION | |
| LTC3890HUH-2#WPBF | PRODUCTION | |
| LTC3890HUH-2#WTRPBF | PRODUCTION | |
| LTC3890IUH-2#WPBF | PRODUCTION | |
| LTC3890IUH-2#WTRPBF | PRODUCTION | |
This is the most up-to-date revision of the Data Sheet.
Software Resources
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Request a Driver/SoftwareHardware Ecosystem
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Tools & Simulations
LTspice 3
- LTC3890-2 Demo Circuit - Automotive 12V SEPIC and 3.3V Step-Down Converter (5-35V to 12V @ 2A and 3.3V @ 10A)
- LTC3890-2 Demo Circuit - Automotive 12V SEPIC and 3.3V Step-Down Converter (10-18V to 12V @ 3A & 3.3V @ 10A)
- LTC3890-2 - Step-Down (Buck) Regulators
Models for the following parts are available in LTspice:
- LTC3890
- LTC3890-1
- LTC3890-2
- LTC3890-3
LTpowerCAD 4
- LTC3890 Project - Low Iq, 2-Phase Synchronous Step-Down DC/DC Supply with Inductor DCR Current Sensing (16-55V to 12 @ 25A)
- LTC3890 Project - Low Iq, 2-Phase Synchronous Step-Down DC/DC Supply with Rsense Current Sensing (16-55V to 12 @ 25A)
- LTC3890-2 Project - Synchronous PolyPhase Buck Converter (16-60V to 12V @ 25A)
- LTC3890-2 Example Design 12Vin to 3.3Vout1 5A max 8.5Vout2 3A max
Design tools for the following parts are available in LTpowerCAD:
- LTC3890
- LTC3890-2
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.
LTpowerCAD® is a power supply design program which selects power stage components, provides detailed power efficiency, shows quick loop Bode plot stability and load transient analysis, and can export to LTspice for simulation.
Evaluation Kits
LTC3890EUH-2 Demo Board | 16V ≤ VIN ≤ 60V; VOUT = 12V @ 25A
Resources
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