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reference designLTC7803-3.3 | Demoboard LTC7803-3.3

Analog Devices LTC7803-3.3 | Demoboard LTC7803-3.3

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

Overview

TopologyBuck Converter
Input voltage4.5-40 V
Output 13.3 V

Description

The LTC®7803-3.3 is a high performance synchronous step-down DC/DC switching regulator controller that drives an all N-channel power MOSFET stage.Synchronous rectification increases efficiency, reduces power losses and eases thermal requirements. A constant frequency current mode architecture allows a phase-lockable switching frequency of up to 3MHz. The LTC7803‑3.3 operates from a wide 4.5V to 40V input supply range and regulates the output to a fixed 3.3V voltage using an internal feedback resistor divider.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 MODE pin selects among Burst Mode operation,pulse-skipping mode, or continuous inductor current mode at light loads.The LTC7803-3.3 additionally features spread spectrum operation which significantly reduces the peak radiatedand conducted noise on both the input and output supplies,making it easier to comply with electromagnetic interference (EMI) standards.

Features

  • Low Operating IQ: 12μA (14V VIN to 3.3V VOUT)
  • Wide Input Voltage Range: 4.5V to 40V
  • Fixed 3.3V Regulated Output Voltage
  • Spread Spectrum Operation
  • RSENSE or DCR Current Sensing
  • 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
  • Low Shutdown IQ: 1.2μA
  • Thermally Enhanced 16-Lead 3mm × 3mm QFN Package
  • AEC-Q100 Qualified for Automotive Applications

Typical applications

  • Industrial
  • Military/Avionics
  • Telecommunications
  • Automotive and Transportation

More information

Parts approved by Analog Devices

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Order Code
Data­sheet
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Downloads
Status
Product series
L(µH)
IR(A)
ISAT(A)
RDC max.(mΩ)
fres(MHz)
Mount
LR(µH)
ISAT,10%(A)
ISAT,30%(A)
RDC(mΩ)
Material
SamplesAvailability & Sample
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7443082022
SPECWE-HCM SMT High Current Flat Wire Inductor, 0.22 µH, 60 A

PCN pending

Due to a pending PCN there will be a new datasheet revision issued for this order code soon. Please find the actual as well based on valid PCN date the new revision datasheet below. If you have further questions please get in contact with our sales staff.

Simu­lation
Availability
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Downloads9 files

Status
ActiveProduction is active. Expected lifetime: >10 years.
iProduction is active. Expected lifetime: >10 years.
Product seriesWE-HCM SMT High Current Flat Wire Inductor
Inductance0.22 µH
Rated Current60 A
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Self Resonant Frequency52 MHz
MountSMT 
Rated Inductance0.154 µH
Saturation Current @ 10%52.7 A
Saturation Current @ 30%59.3 A
DC Resistance0.18 mΩ
MaterialMnZn 
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7843320068
SPECWE-CHSA SMT High Current Inductor, 0.68 µH, 25.3 A
Simu­lation
Availability
–
Downloads9 files

Status
ActiveProduction is active. Expected lifetime: >10 years.
iProduction is active. Expected lifetime: >10 years.
Product seriesWE-CHSA SMT High Current Inductor
Inductance0.68 µH
Rated Current25.3 A
Saturation Current41.4 A
DC Resistance2.05 mΩ
Self Resonant Frequency88 MHz
MountSMT 
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