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reference designLTC7815 | Demoboard DC2738A

Analog Devices LTC7815 | Demoboard DC2738A

Triple Output Synchronous Step-Up/Dual Step-Down Supply

Overview

TopologyBuck-Boost Converter
Input voltage4.5-36 V
Output 15 V / 8 A
Output 210 V / 7 A
Output 33.3 V / 8 A

Description

Demonstration circuit 2738A is a triple output synchronous step-up/dual step-down supply featuring the LTC®7815. The demonstration circuit is designed for twobuck 5V/8A, 3.3V/8A outputs supplied by a boost 10V/7A output. Benefiting from this feature, the buck outputs are able to maintain regulation over a wide input voltage range of 4.5V to 36V which is suitable for automotive or other battery fed applications. Also, the demonstration circuituses a drop-in layout that the main buck circuit components fit in an area of three-quarter inches by 1.5 inches,while the main boost circuit area is three-quarter inchesby 1.75 inches. The package style for the LTC7815 is a 38-pin exposed pad QFN.The main features of the board include rail tracking (buck channels only), an internal 5V linear regulator for bias,separated RUN pins for each output, a PGOOD signal (CH1only), an over voltage indicator for CH3 and a mode selector that allow the converter to run in CCM, pulse-skipping or Burst Mode® operation. Synchronization to an externalclock is also possible. The LT7815 data sheet gives a complete description of these parts, operation and application information. The data sheet must be read in conjunctionwith this quick start guide for demo circuit 2738A.

Features

  • Dual Buck Plus Single Boost Synchronous Controllers
  • Wide Bias Input Voltage Range: 4.5V to 38V
  • Outputs Remain in Regulation Through Cold Crank Down to a 2.5V Input Supply Voltage
  • Buck Output Voltage Range: 0.8V ≤ VOUT ≤ 24V
  • Boost Output Voltage Up to 60V
  • Low Operating IQ: 28μA (One Channel On)
  • RSENSE or DCR Current Sensing
  • 100% Duty Cycle for Boost Synchronous MOSFET Even in Burst Mode® Operation
  • Phase-Lockable Frequency (320kHz to 2.25MHz)
  • Programmable Fixed Frequency (320kHz to 2.25MHz)
  • Very Low Buck Dropout Operation: 98% Duty Cycle
  • Small 38-Lead 5mm × 7mm QFN Package

Typical applications

  • Automotive Always-On and Start-Stop Systems
  • Multioutput Buck-Boost Applications
  • Distributed DC Power Systems
  • Battery Operated Digital Devices

More information

Products

Order Code
Data­sheet
Downloads
Status
Product series
f(mm)
Pins
Type
Mount
L(mm)
IR(A)
Working Voltage(V (AC))
Operating Temperature
Samples
702935000
WA-SNSR Self-Retaining Spacer, 4.8 mm, –
Downloads3 files

CAD files ZIP

Download all 3 files as zip archive
ZIP

Status Activei| Production is active. Expected lifetime: >10 years.
Product seriesWA-SNSR Self-Retaining Spacer
Drilling in Panel4.8 mm
–
–
–
Length12.7 mm
–
–
Operating Temperature -30 °C up to +85 °C
60800213421
WR-PHD Jumper, –, 2
Downloads3 files

CAD files ZIP

Download all 3 files as zip archive
ZIP

Status Activei| Production is active. Expected lifetime: >10 years.
Product seriesWR-PHD Jumper
–
Pins2 
–
–
–
Rated Current3 A
Working Voltage200 V (AC)
Operating Temperature -25 °C up to +105 °C
62000311121
WR-PHD Pin Header, –, 3
Downloads7 files

EDA models: Components ZIP

CAD files ZIP

Status Activei| Production is active. Expected lifetime: >10 years.
Product seriesWR-PHD Pin Header
–
Pins3 
TypeStraight 
MountTHT 
Length6 mm
Rated Current2 A
Working Voltage200 V (AC)
Operating Temperature -40 °C up to +105 °C
62000411121
WR-PHD Pin Header, –, 4
Downloads7 files

EDA models: Components ZIP

CAD files ZIP

Status Activei| Production is active. Expected lifetime: >10 years.
Product seriesWR-PHD Pin Header
–
Pins4 
TypeStraight 
MountTHT 
Length8 mm
Rated Current2 A
Working Voltage200 V (AC)
Operating Temperature -40 °C up to +105 °C