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08-08-2017

20V, 20A Monolithic Synchronous Silent Switcher 2 Buck Regulator Reduces EMI & Enables High Power Density Applications

Analog Devices » LTC7150S

Analog Devices, Inc., which recently acquired Linear Technology Corporation, announces the LTC7150S, a 20 V, 20 A monolithic synchronous buck converter with differential VOUT remote sensing. The device’s unique phase lockable controlled on-time constant frequency current mode architecture eases compensation and is ideal for high step-down ratio applications that operate at high frequencies while demanding fast transient response. The LTC7150S uses Silent Switcher®2 technology, including integrated bypass capacitors to deliver a highly efficient solution with excellent EMI performance while easing layout constraints. Multiphase operation with up to 12 phases provides the capability to directly parallel multiple devices for higher current with minimal increase in input and output capacitance. VOUT remote sense ensures that voltage regulation at the load is accurate regardless of load current or board layout. The LTC7150S’s wide 3.1 V to 20 V input range supports a wide variety of applications, including most intermediate bus voltages, and is compatible with many battery types. Integrated N-channel MOSFETs deliver continuous load currents as high as 20 A with minimal thermal derating, at output voltages ranging from 0.6 V to VIN, ideal for point-of-load applications such as powering high current/low voltage DSPs, FPGAs and ASICs. Other applications include telecom/datacom systems, distributed power architectures and general high power density systems.

Analog Devices - LTC7150S

The LTC7150S’s very low 25 ns minimum on-time allows for a high step-down ratio power supply at high frequencies supporting both forced continuous and discontinuous mode operation. The operating frequency is selectable from 400 kHz to 3 MHz and can be synchronized to an external clock. The LTC7150S’s total differential output voltage accuracy is ±1% over the –40 °C to 125 °C operating junction temperature range. Additional features include differential remote VOUT sensing directly at the load, PHMODE phase selector pin, accurate 1.2 V RUN pin threshold, VIN overvoltage protection, power good and programmable soft-start/tracking.

The LTC7150S Typical Application
The LTC7150S Typical Application.

The LTC7150S is available in a thermally enhanced 42-lead 5 mm × 6 mm × 1.3 mm BGA package, in both RoHS lead-free and leaded SnPb (63/37) finishes. The E and I grades are specified from –40 °C to 125 °C operating junction temperature range. The 1,000-piece price starts at $5.60 each for the E grade. All versions are available from stock.

Efficiency and Power Loss vs Load Current
Efficiency and Power Loss vs Load Current.

Summary of Features: LTC7150S

  • Silent Switcher®2 Architecture
  • High Efficiency: Up to 96%
  • Output Current: 20 A
  • VIN Range: 3.1 V to 20 V
  • Integrated Power N-Channel MOSFETs (6 mΩ Top, 2.5 mΩ Bottom)
  • Differential VOUT Remote Sense
  • Adjustable Frequency: 400 kHz to 3 MHz
  • PolyPhase® Operation: Up to 12 Phases
  • Output Tracking & Soft-Start
  • Reference Accuracy: 0.6 V ±1%
  • Current Mode Operation for Excellent Line & Load Transient Response
  • Synchronizable Frequency from 400 kHz to 3 MHz
  • Accurate 1.2 V RUN Pin Threshold
  • Supports Forced Continuous/Discontinuous Modes
  • 42-Lead 5 mm × 6 mm × 1.3 mm BGA Package
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