Datasheet for LTC3890:
- Manufacturer Part Number : LTC3890
- Manufacturer : AD
- Description : 60V Low IQ, Dual, 2-Phase Synchronous Step-Down DC/DC Controller
- Series : LTC3890
- Reference Price : USD 3.672
- Our Price : We have a better price, contact us by email
- Product Type : Switching Regulators
- Function : Step-Down (Buck) Regulators
- Current Suggest : Recommended for New Designs
- Status : Production
- RoHS Status: -
- Voltage: -
- Feature: -
- Package Case: -
- Temperature Range: -
- Packing: Reel/Tray/Tube
- Standard Packing Quantity: -
- Country of Origin: -
- Other Part Number : LTC3890
- Shipping methods : DHL FEDEX UPS TNT
- Delivery Time : Ship within 1 day.
- Manufacturer Production time : 6-8 weeks (Normally have stocks)
- Weight : 0.001KG
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- 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
- Selectable Current Limit
- Very Low Dropout Operation: 99% Duty Cycle
- Adjustable Output Voltage Soft-Start or Tracking
- Power Good Output Voltage Monitors
- Output Overvoltage Protection
- Low Shutdown IQ : < 14µA
- Internal LDO Powers Gate Drive from VIN or EXTVCC
- No Current Foldback During Start-Up
- Small Low Profile (0.75mm) 5mm × 5mm QFN Package
- AEC-Q100 Qualified for Automotive Applications
The LTC3890 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. The LTC3890 features a precision 0.8V reference and power good output indicators. 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 leaded package version (28-lead Narrow SSOP), see the LTC3890-1 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
This product has been released to the market. The data sheet contains all final specifications and operating conditions. For new designs, ADI recommends utilization of these products.
