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reference designLTC7899

Analog Devices LTC7899

140V, Low IQ, Negative to Positive Synchronous Boost Controller with 10V Gate Drive

Overview

TopologyBoost Converter
Input voltage1-135 V
Switching frequency370-2500 kHz
Output 1135 V / 8.8 A

Description

The LTC®7899 is a high performance DC/DC negative to positive switching regulator controller that drives all N-channel synchronous MOSFET stages and can operate from input voltages up to 135V. The positive output voltage can easily be programmed with only two resistors by using the integrated feedback level shifter. The LTC7899 can alternatively be configured as a step-up (Boost) operation with pass-through.The gate drive voltage for the LTC7899 can be programmed from 5V to 10V to allow the use of logic or standard-level MOSFETs to maximize efficiency.The low no-load quiescent current extends operating run time 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 user can adjust the dead times of the LTC7899 with external resistors for margin or to tailor the application for higher efficiency and allow for high frequency operation.The LTC7899 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.

Features

  • Converts Negative Input to Positive Output Regulated with Respect to Ground
  • Wide |VIN |+VOUT Range: 4V to 135V (140V ABS MAX)
  • Internal Feedback Level Shifter for Easy Output Voltage Programming with Two Resistors
  • Adjustable Gate Drive Level: 5V to 10V (OPTI-DRIVE, 14V 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
  • Supports Positive Input to Positive Output Boost Up to 135V with Pass-Through
  • Operation Down to 1V after Start-Up
  • CLK Output for High Power PolyPhase Operation
  • Spread Spectrum Frequency Modulation
  • Programmable Frequency (100kHz to 2.5MHz)
  • Phase-Lockable Frequency (100kHz to 2.5MHz)
  • 28-Pin (4mm x 5mm) QFN Package

Typical applications

  • Industrial Power Systems
  • Telecommunications Power Systems
  • Military/Avionics

More information

Products

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Data­sheet
Simu­lation
Downloads
Status
Product series
L(µH)
IRP,40K(A)
ISAT,10%(A)
ISAT,30%(A)
RDC max.(mΩ)
fres(MHz)
Wire Type
SamplesAvailability & Sample
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7443640470B
SPECWE-HCF SMT High Current Inductor, 4.7 µH, 59.2 A
Simu­lation
Availability
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Downloads9 files

Status Activei| Production is active. Expected lifetime: >10 years.
Product seriesWE-HCF SMT High Current Inductor
Inductance4.7 µH
Performance Rated Current59.2 A
Saturation Current @ 10%43.85 A
Saturation Current @ 30%49.5 A
DC Resistance0.97 mΩ
Self Resonant Frequency22.6 MHz
Wire TypeFlat 
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7443641000
SPECWE-HCF SMT High Current Inductor, 10 µH, 34.95 A
Simu­lation
Availability
–
Downloads9 files

Status Activei| Production is active. Expected lifetime: >10 years.
Product seriesWE-HCF SMT High Current Inductor
Inductance10 µH
Performance Rated Current34.95 A
Saturation Current @ 10%32.6 A
Saturation Current @ 30%37 A
DC Resistance2.64 mΩ
Self Resonant Frequency13 MHz
Wire TypeFlat 
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7443641500
SPECWE-HCF SMT High Current Inductor, 15 µH, 34.95 A
Simu­lation
Availability
–
Downloads9 files

Status Activei| Production is active. Expected lifetime: >10 years.
Product seriesWE-HCF SMT High Current Inductor
Inductance15 µH
Performance Rated Current34.95 A
Saturation Current @ 10%22 A
Saturation Current @ 30%26 A
DC Resistance2.64 mΩ
Self Resonant Frequency11 MHz
Wire TypeFlat 
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