Features and Benefits
- Dual, 180° Phased Controllers
- 2-Pin VID Output Voltage Programming from 0.6V to 5V
- High Efficiency: Up to 95%
- RSENSE or DCR Current Sensing
- Phase-Lockable Fixed Frequency 250kHz to 770kHz
- Adjustable Current Limit
- Dual N-Channel MOSFET Synchronous Drive
- Wide VIN Range: 4.5V to 38V Operation
- Adjustable Soft-Start Current Ramping or Tracking
- Output OV Protection With Reverse Current Limit
- Power Good Output Voltage Monitor
- 32-Pin 5mm × 5mm QFN and 38-Lead TSSOP Packages
The LTC3865/LTC3865-1 are high performance dual synchronous step-down DC/DC switching regulator controllers that drive all N-channel synchronous power MOSFET stages. A constant frequency current mode architecture allows a phase-lockable frequency of up to 770kHz. Power loss and 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. Independent track/soft-start pins for each controller ramp the output voltage 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, and continuous inductor current mode. The output voltages can be precisely programmed by pin strapping or external resistors.
The LTC3865/LTC3865-1 are available in low profile (5mm × 5mm) 32-pin QFN and 38-Lead thermally enhanced TSSOP packages.
- DC Power Distribution Systems
Product Lifecycle Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Evaluation Kits (2)
Demonstration circuit 1480A is a dual output synchronous buck DC/DC converter featuring the LTC3865EUH-1. The input voltage range is from 4.5V to 14V. The default outputs are 3.3V/5A and 1.8V/5A, but pin programming allows each output to be set at 5V, 3.3V, 2.5V, 1.8V, 1.5V, 1.2V, 1.1V, 1V or an adjustable voltage.
Demonstration circuit 1479A is a dual output synchronous buck DC/DC converter featuring the LTC3865EUH. The input voltage range is from 4.5V to 14V. The outputs are 1.5V/15A and 1.2V/15A. Each output voltage can be precisely programmed to a preset value within 1% error using two 3-state programming pins. The output voltage can be set to 1.0V, 1.1V, 1.2V, 1.5V, 1.8V, 2.5V 3.3V or 5V. The LTC3865 differs from the LTC3865-1 in that the "-1" has a fixed current limit threshold. The 32-pin package options for both devices have no SGND pin and only one PGND pin.
Documentation & Resources
R526 Reliability Data3/26/2018
Tools & Simulations
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Models for the following parts are available in LTspice:
LTC3865 Companion Parts
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Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.