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reference designLTC7817 | Demoboard DC3033A

Analog Devices LTC7817 | Demoboard DC3033A

40V, Low IQ, 3MHz, Triple Output Buck/Buck/Boost Synchronous Controller

Overview

TopologyBuck Converter
Input voltage4.5-36 V
Output 13.3 V / 10 A
Output 25 V / 10 A
Output 310 V / 10 A

Description

Demonstration circuit 3033A is a triple output synchronous step-up/dual step-down supply featuring the LTC7817. The demonstration circuit is designed for two buck outputs 5V/10A, 3.3V/10A supplied by a boosted 10V 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 circuit uses a drop-in layout whereas the main buck circuit components fit in an area of ¾-inch by 1½-inch, while the main boost circuit area is ¾-inch by 1¾-inch. The package style for the LTC7817 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 (CH1 only), and a mode selector that allow the converter to run in forced continuous mode (FCM), pulse-skipping (PSM) or Burst Mode® operation (BURST). Synchronization to an external clock is also possible. The LTC7817 data sheet gives a complete description of these parts, operation and application information. The data sheet must be read in conjunction with this quick start guide for demo circuit 3033A.

Features

  • Dual Buck Plus Single Boost Synchronous Controllers
  • Low Operating IQ:
  • 14μA (14V to 3.3V, Channel 1 On)
  • Outputs Remain in Regulation Through Cold Crank Down to 1V Input Supply Voltage
  • Wide Bias Input Voltage Range: 4.5V to 40V
  • Buck and Boost Output Voltages up to 40V
  • Pass-Thru™ Operation: 100% Duty Cycle for Boost Synchronous MOSFET
  • 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
  • Very Low Buck Dropout Operation: 99% Duty Cycle
  • Low Shutdown IQ: 1.5μA
  • Small 38-Lead 5mm × 7mm QFN Package
  • AEC-Q100 Automotive Qualification in Process

Typical applications

  • Battery fed applications
  • Automotive

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