The LTC3856EFE is a single output, dual channel PolyPhase synchronous step-down DC/DC controller that drives all N-channel power MOSFET stages. This device includes a high speed differential amplifier for remote output voltage sense. Power loss and supply noise are minimized by operating the two controller output stages out-of-phase and up to 12-phase operation can be achieved.
The LTC3856EFE monitors the output current by sensing the voltage drop across the output inductor (DCR) or by using a sense resistor. DCR temperature compensation maintains an accurate current sense threshold over a broad temperature range. A constant-frequency, current mode architecture allows a phase-lockable frequency of up to 770kHz.
A wide 4.5V to 38V input supply range encompasses most intermediate bus voltages and battery chemistries. Burst Mode operation, continuous or Stage Shedding modes are supported. A TK/SS pin shared by both channels ramps the output voltage during start-up.
Feature
- PolyPhase® Controller Reduces Input and Output Capacitance and Power Supply Induced Noise
- Wide VIN Range: 4.5V to 38V Operation
- ±0.75%, 0.6V Reference Voltage Accuracy
- High Efficiency: Up to 95%
- Programmable Burst Mode® Operation or Stage Shedding™ for Highest Light Load Efficiency
- Active Voltage Positioning (AVP)
- RSENSE or DCR Current Sensing
- Programmable DCR Temperature Compensation
- Phase-Lockable Fixed Frequency: 250kHz to 770kHz
- True Remote Sense Differential Amplifier
- Dual N-Channel MOSFET Synchronous Drive
- VOUT Range: 0.6V to 5V without Differential Amplifier
- VOUT Range: 0.6V to 3.3V with Differential Amplifier
- Adjustable Soft-Start or VOUT Tracking
- Stackable for Up to 12-Phase Operation
- 32-Pin (5mm × 5mm) QFN and 38-Pin TSSOP Packages
Applications
- Telecom and Datacom Systems
- Industrial and Medical Instruments
- DC Power Distribution Systems
- Computer Systems
(Picture: Pinout)
