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reference designLTC7802

Analog Devices LTC7802

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

Overview

TopologyBuck Converter
Input voltage4.5-38 V
Switching frequency100-3000 kHz
Output 12.5 V / 10 A
Output 21 V / 20 A

Description

The LTC®7802 is a high performance dual step-down synchronous DC/DC switching regulator controller that drives all N-channel power MOSFET stages. Constant fre¬quency current mode architecture allows a phase-lockable switching frequency of up to 3MHz. The LTC7802 oper¬ates 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 oper¬ating runtime in battery powered systems. OPTI-LOOP compensation allows the transient response to be opti¬mized 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.

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

Typical applications

  • Automotive and Transportation
  • Industrial
  • Military/Avionics

More information

Parts approved by Analog Devices

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Order Code
Data­sheet
Simu­lation
Downloads
Status
Product series
L(nH)
IRP,40K(A)
ISAT,10%(A)
ISAT,30%(A)
RDC(mΩ)
fres(MHz)
Material
Qty.
LR(nH)
IR(A)
SamplesAvailability & Sample
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744308020
SPECWE-HCM SMT High Current Flat Wire Inductor, 200 nH, 54.3 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
–
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
Inductance200 nH
Performance Rated Current54.3 A
Saturation Current @ 10%44 A
Saturation Current @ 30%50.4 A
DC Resistance0.37 mΩ
Self Resonant Frequency45 MHz
MaterialMnZn 
Packaging Unit500 
Rated Inductance198 nH
Rated Current25 A
–Check availability
744311100
SPECWE-HCI SMT Flat Wire High Current Inductor, 1000 nH, 16.8 A

PCN pending

Due to a pending PCN, a modification of the component will be implemented soon. Please find the PCN below. If you have further questions please get in contact with our sales staff.

Simu­lation
Availability
–
Downloads9 files

Status
ActiveProduction is active. Expected lifetime: >10 years.
iProduction is active. Expected lifetime: >10 years.
Product seriesWE-HCI SMT Flat Wire High Current Inductor
Inductance1000 nH
Performance Rated Current16.8 A
Saturation Current @ 10%8 A
Saturation Current @ 30%19 A
DC Resistance4.6 mΩ
Self Resonant Frequency85 MHz
MaterialSuperflux 
Packaging Unit1000 
Rated Inductance780 nH
–
–Check availability