LTC7802
Info : RECOMMENDED FOR NEW DESIGNS
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LTC7802

40V Low IQ, 3MHz Dual, 2-Phase Synchronous Step-Down Controller with Spread Spectrum

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Info : RECOMMENDED FOR NEW DESIGNS tooltip
Info : RECOMMENDED FOR NEW DESIGNS tooltip
Part Details
Part Models 8
1ku List Price Starting From $2.51
Features
  • Wide Input Voltage Range: 4.5V to 40V
  • Wide Output Voltage Range: 0.8V to 99% • VIN
  • Low Operating IQ: 14μA (14V to 3.3V, Channel 1 On)
  • Spread Spectrum Operation
  • RSENSE or DCR Current Sensing
  • Out-of-Phase Controllers Reduce Required Input Capacitance and Power Supply Induced Noise
  • Programmable Fixed Frequency (100kHz to 3MHz)
  • Phase-Lockable Frequency (100kHz to 3MHz)
  • Selectable Continuous, Pulse-Skipping, or Low Ripple, Burst Mode® Operation at Light Loads
  • Very Low Dropout Operation: 99% Duty Cycle
  • Power Good Output Voltage Monitors
  • Output Overvoltage Protection
  • Internal LDO Powers Gate Drive from VIN or EXTVCC
  • Low Shutdown IQ: 1.5μA
  • Small 28-Lead 4mm × 5mm QFN Package
  • AEC-Q100 Qualified for Automotive Applications
Additional Details
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The LTC7802 is a high performance dual step-down synchronous DC/DC switching regulator controller that drives all N-channel power MOSFET stages. Constant frequency current mode architecture allows a phase-lockable switching frequency of up to 3MHz. The LTC7802 operates from a wide 4.5V to 40V input supply range. Power loss and supply noise are minimized by operating the two controller output stages out-of-phase.

The very low no-load quiescent current extends operating runtime 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 LTC7802 features a precision 0.8V reference and power good output indicators. The MODE pin selects among Burst Mode operation, pulse-skipping mode, or continuous inductor current mode at light loads.

The LTC7802 additionally features spread spectrum operation which significantly reduces the peak radiated and conducted noise on both the input and output supplies, making it easier to comply with electromagnetic interference (EMI) standards.

APPLICATIONS

  • Automotive and Transportation
  • Industrial
  • Military/Avionics
Part Models 8
1ku List Price Starting From $2.51

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Documentation

Documentation

Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
LTC7802EUFDM#PBF
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LTC7802IUFDM#WPBF
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Software & Part Ecosystem

Software & Part Ecosystem

Evaluation Kit

Evaluation Kits 1

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DC2922A

LTC7802, LTC7802-3.3 | Dual 5V-36VIN, 3.3V/20A and 5V/15A Output Synchronous Buck Converter with Spread Spectrum

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DC2922A

LTC7802, LTC7802-3.3 | Dual 5V-36VIN, 3.3V/20A and 5V/15A Output Synchronous Buck Converter with Spread Spectrum

LTC7802, LTC7802-3.3 | Dual 5V-36VIN, 3.3V/20A and 5V/15A Output Synchronous Buck Converter with Spread Spectrum

Product Detail

Demonstration circuit 2922A-A and 2922A-B are dual step-down DC/DC converters featuring the LTC7802 or LTC7802-3.3 PWM controllers. Both controller IC’s used on these demo boards are 40V Low IQ, Dual, 2-Phase Synchronous Step-Down Controllers with Spread Spectrum. And both demo boards operate over a 5V to 36V input voltage range and provide a 3.3V at 20A and 5V at 15A outputs.

The DC2922A-A uses the LTC7802 and has a resistor divider network to set the 3.3V output. The DC2922A-B uses the LTC7802-3.3 and has a fixed 3.3V output that does not require the resistor divider network.

Some of the key features of both boards include a FREQUENCY jumper for spread-spectrum or external clock option, and EXTVCC jumper for VOUT2, EXTVCC, or input derived VCC, a MODE jumper that allows the converter to run in FCM, pulse-skipping, or Burst Mode® operation and PGOOD signals for each output.

The two channels can be paralleled for higher output current. See the respective data sheets for more information on setting-up the board for paralleling both outputs. The LTC7802 and LTC7802-3.3 data sheets give a complete description of these devices, their operation and application information, and must be read in conjunction with the DC2922A demo manual prior to working on or modifying these demo circuits.

Tools & Simulations

Tools & Simulations 2

LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.

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