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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

Products

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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
Simu­lation
Availability
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Downloads9 files

Status Activei| Production 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
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744311100
SPECWE-HCI SMT Flat Wire High Current Inductor, 1000 nH, 16.8 A
Simu­lation
Availability
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Downloads9 files

Status Activei| Production 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
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