LTC7897

RECOMMENDED FOR NEW DESIGNS

140V, Low IQ, Synchronous Buck Controller with Programmable 5V to 10V Gate Drive

Part Models
2
1ku List Price
Starting From $3.50

Part Details

  • Wide VIN Range: 4V to 135V (140V ABS MAX)
  • Wide Output Voltage Range: 0.8V ≤ VOUT ≤ 135V (140V ABS MAX)
  • Adjustable Gate Drive Level: 5V to 10V (OPTI-DRIVE, 15V ABS MAX)
  • Adjustable Driver Voltage UVLO
  • Adaptive or Resistor Adjustable Dead Times
  • Split-Output Gate Drivers for Adjustable Turn-On and Turn-Off Driver Strengths
  • 100% Duty Cycle Operation
  • Low Operating IQ: 5μA (48V<IN to 3.3VOUT)
  • Spread Spectrum Frequency Modulation
  • Programmable Frequency (100kHz to 2.5MHz);
  • Synchronizable Frequency (100kHz to 2.5MHz);
  • 28-Pin (4mm x 5mm) QFN Package
LTC7897
140V, Low IQ, Synchronous Buck Controller with Programmable 5V to 10V Gate Drive
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Evaluation Kits

eval board
EVAL-LTC7897-AZ

Wide Input and Output Voltage Synchronous Buck Controller

Product Details

The evaluation circuit EVAL-LTC7897-AZ features the LTC®7897: a 140V Low IQ Synchronous Buck Controller with Programmable 5V to 10V Gate Drive. Split gate drivers allow for easily adjustable turn-on and turn-off of FETs. User adjustable adaptive and smart dead time control modes are available for optimal gate timing. Additionally, the IC features low IQ, up to 2.5MHz programmable/synchronizable switching frequency, spread spectrum, and a small 28-lead (4mm x 5mm) QFN package. These features allow for a wide variety of applications including industrial, military, medical, and telecommunications systems.

The EVAL-LTC7897-AZ operates from a 16V to 100V input voltage range and generates a 12V, 20A output (see Figure 8 in user guide). The LTC7897 has a precision voltage reference providing an output voltage with 2% tolerance over the full operating conditions. The EVAL-LTC7897-AZ is set to a 200kHz switching frequency, which results in a small and efficient circuit. The converter achieves over 93% efficiency with a 20A load at full operating VIN and peak efficiency over 96%.

The LTC7897 supports output voltages from 0.8V to 135V. The evaluation circuit has been designed with 150V FETs. Various FETs of similar footprint can be substituted to fit a wide array of applications.

The EVAL-LTC7897-AZ provides a high-performance, cost-effective solution for generating a 12V output. The LTC7897 data sheet gives a complete description of this part, its operation, and application information. The data sheet must be read in conjunction with this user guide for EVAL-LTC7897-AZ.

Design files for this circuit board are available at www.analog.com.

EVAL-LTC7897-AZ
Wide Input and Output Voltage Synchronous Buck Controller

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