LTC3890-1
RECOMMENDED FOR NEW DESIGNS60V Low IQ, Dual, 2-Phase Synchronous Step-Down DC/DC Controller
- Part Models
- 8
- 1ku List Price
- Starting From $6.75
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 Required 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
- Very Low Dropout Operation: 99% Duty Cycle
- Adjustable Output Voltage Soft-Start or Tracking
- Power Good Output Voltage Monitor
- Output Overvoltage Protection
- Low Shutdown IQ: <14μA
- Internal LDO Powers Gate Drive from VIN or EXTVCC
- No Current Foldback During Start-Up
- Narrow SSOP Package
The LTC3890-1 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 supply noise are minimized by operating the two controller output stages out-of-phase.
The 50μA 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. 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 foldback limits MOSFET heat dissipation during short-circuit conditions. The PLLIN/MODE pin selects among Burst Mode operation, pulse-skipping mode, or continuous conduction mode at light loads.
For a leadless 32-pin QFN package with additional features of adjustable current limit, clock out, phase modulation and two PGOOD outputs, see the LTC3890 data sheet.
| LTC3890 | LTC3890-1 | LTC3890-2 | LTC3890-3 | |
| Adjustable Current Limit | 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 | 5 × 5 QFN-32 | SSOP-28 | 5 × 5 QFN-32 | SSOP-28 |
Applications
- Automotive Always-On Systems
- Battery Operated Digital Devices
- Distributed DC Power Systems
Documentation
Data Sheet 1
User Guide 2
Product Selector Card 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 |
|---|---|---|---|
| LTC3890EGN-1#PBF | 28-Lead SSOP (Narrow 0.15 Inch) | ||
| LTC3890EGN-1#TRPBF | 28-Lead SSOP (Narrow 0.15 Inch) | ||
| LTC3890HGN-1#PBF | 28-Lead SSOP (Narrow 0.15 Inch) | ||
| LTC3890HGN-1#TRPBF | 28-Lead SSOP (Narrow 0.15 Inch) | ||
| LTC3890IGN-1#PBF | 28-Lead SSOP (Narrow 0.15 Inch) | ||
| LTC3890IGN-1#TRPBF | 28-Lead SSOP (Narrow 0.15 Inch) | ||
| LTC3890MPGN-1#PBF | 28-Lead SSOP (Narrow 0.15 Inch) | ||
| LTC3890MPGN-1#TRPBF | 28-Lead SSOP (Narrow 0.15 Inch) |
| Part Models | Product Lifecycle | PCN |
|---|---|---|
|
Oct 3, 2024 - 24_0235 (QSOP/SSOP PKG) Migrating Bottom Trace Code Marking to Top Side Laser Marking |
||
| LTC3890EGN-1#PBF | PRODUCTION | |
| LTC3890EGN-1#TRPBF | PRODUCTION | |
| LTC3890HGN-1#PBF | PRODUCTION | |
| LTC3890HGN-1#TRPBF | PRODUCTION | |
| LTC3890IGN-1#PBF | PRODUCTION | |
| LTC3890IGN-1#TRPBF | PRODUCTION | |
|
Aug 10, 2022 - 22_0177 Laser Top Mark Conversion for QSOP20_24_28 Assembled in ADPG [PNG] and UTL |
||
| LTC3890EGN-1#PBF | PRODUCTION | |
| LTC3890EGN-1#TRPBF | PRODUCTION | |
| LTC3890HGN-1#PBF | PRODUCTION | |
| LTC3890HGN-1#TRPBF | PRODUCTION | |
| LTC3890IGN-1#PBF | PRODUCTION | |
| LTC3890IGN-1#TRPBF | PRODUCTION | |
| LTC3890MPGN-1#PBF | PRODUCTION | |
| LTC3890MPGN-1#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) |
||
| LTC3890EGN-1#PBF | PRODUCTION | |
| LTC3890EGN-1#TRPBF | PRODUCTION | |
| LTC3890HGN-1#PBF | PRODUCTION | |
| LTC3890HGN-1#TRPBF | PRODUCTION | |
| LTC3890IGN-1#PBF | PRODUCTION | |
| LTC3890IGN-1#TRPBF | PRODUCTION | |
| LTC3890MPGN-1#PBF | PRODUCTION | |
| LTC3890MPGN-1#TRPBF | 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 1
Models for the following parts are available in LTspice:
- LTC3890
- LTC3890-1
- LTC3890-2
- LTC3890-3
LTpowerCAD 2
- LTC3890-1 Project - Low Iq, Dual, 2-Phase Synchronous Step-Down DC/DC Supply with Inductor DCR Current Sensing (14-55V to 3.3V @ 5A & 8.4V @ 3A)
- LTC3890-1 Project - Low Iq, Dual, 2-Phase Synchronous Step-Down DC/DC Supply with Rsense Current Sensing (14-55V to 3.3V @ 5A & 8.4V @ 3A)
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
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