We use cookies to ensure that we can provide you with the best experience on our website. By using our website, you are consenting to the use of cookies as set out in our policy. OK
Show Prices Inc VAT
Help
  • Sign up for our Newsletter

Introducing the LTC3372 Low IQ Buck Controller Plus 4-Channel 8A Configurable Buck DC/DCs from Analog Devices

Date Published : 16/04/2019 Share with:

Analog Devices has released the Power by Linear™ LTC3372, a highly integrated power management solution for systems that require multiple low voltage outputs generated from an input voltage as high as 60V. The LTC3372 features a 60V synchronous buck switching regulator controller followed by four configurable synchronous monolithic buck regulators. This combination provides up to five high efficiency low quiescent current outputs in a single IC, ideal for automotive, industrial and medical applications.

 

The LTC3372's buck controller operates over a 4.5V to 60V input voltage range and drives an all N-channel MOSFET power stage. Its output can be programmed to either 3.3V or 5V and can generate an output current up to 20A. The controller output is typically used to feed the four monolithic buck regulators. Each monolithic buck channel can be programmed to regulate an output voltage as low as 0.8V with a configurable output current up to 4A. Eight 1A integrated power stages are programmed by the C1-C3 pins into one of eight unique configurations, from a quad 2A buck to a dual 4A buck. This allows only one inductor per channel.

Application Circuit

The LTC3372 offers a low IQ solution ideal for battery-powered or automotive applications in which one or more power supply rails are always on. With just the high voltage controller enabled, the device draws 15µA from a 12V input supply while regulating the output to 5V at no load. Each monolithic buck regulator adds only 8µA of additional IQ per channel enabled. The LTC3372's monolithic buck switching frequency can be programmed from 1MHz to 3MHz and can be synchronized to an external clock while the buck controller switches at 1/6 of this frequency. Additional features include foldback current limiting, soft-start, short-circuit protection and output overvoltage protection.

The LTC3372 is available in a thermally enhanced 48-pin 7mm × 7mm QFN package. E and I grades are specified over an operating junction temperature range of –40°C to 125°C, and the H grade features operation from –40°C to 150°C.

LTC3372 Key Features

  • High Voltage Buck Controller: VIN = 4.5V to 60V, VOUT = 5V/3.3V
  • Low Voltage Buck Regulators: VINA-H = 2.25V to 5.5V, VOUT1-4 ≥ 0.8V
  • 8 X1A LV Buck Integrated Power Stages, Configurable as 2, 3 or 4 Output Channels
  • 8 Unique Output Configurations (1A to 4A per Channel)
  • Low Total No-Load Input Supply Current (IQ)
    • 15μA HV Controller Only (5VOUT)
    • 23μA HV Controller Only (3.3VOUT)
    • 9μA Per Additional LV Regulator Channel
  • 1MHz to 3MHz Operation (HV Controller Runs at 1/6 Frequency)
  • Programmable Frequency or Synchronizable to External Clock
  • Programmable Watchdog & Power-On Reset Delay
  • IC Die Temperature Monitor Output
  • Thermally Enhanced 48-Pin7mm × 7mm QFN Package

The LTC3372 is supported by the DC2419A demonstration board, the board features the LTC3372 in a multi-output step-down converter. The controller portion of the LTC3372 drives a high output voltage (HV) buck converter which has an input voltage range of 6V to 60V. Its output voltage (VOUT_HV) is nominally 5V but can be configured for either 5V or 3.3V with the VOUTPRG pin. VOUT_HV supplies power to the configurable buck regulator. This regulator provides four low voltage (LV) outputs labelled VOUT1-4. These outputs are 1.2V/2A, 1.8V/2A, 2.5V/2A and 3.3V/2A respectively. When VOUT_HV is configured for 5V, it can supply 6A to the external loads with full load on VOUT1-4. With no load on VOUT1-4, VOUT_HV can supply 10A to the external loads

The LV buck regulator consists of eight power stages that can be arranged in up to four channels. The LV regulator on the DC2419A is setup for four channels of two power stages each. With modifications, the LV buck regulator can be setup for eight different configurations. If VOUT_HV is programmed for 3.3V, then VOUT4 which provides 3.3V/2A will be in dropout. This rail will require an external input voltage to stay in regulation. The LV rails operate at 2MHz and the HV converter operates at one-sixth this frequency or 333kHz.

The high frequency of the LV rails allows the use of 4mm × 4mm inductors. The power stage for the HV converter consists of 60V avalanche rated MOSFETs and a 2.2μH 10mm × 10mm inductor. A 4mΩ discrete sense resistor is used to sense current.

The low IQ current of the LTC3372 provides high efficiency at light loads. When the VOUT_HV is supplying the nominal 5V, its Burst Mode® efficiency with 1mA load is 90.3% for a 12V input. When the HV converter is off, it only draws 27μA from a 12V input.

Click here for more information or to buy from Anglia Live.

Click here to download datasheet for the LTC3372

Click here to download the manual for the DC2419A Demonstration Board

Anglia are offering customers a FREE evaluation board and samples of LTC3372 Low IQ Buck Controller Plus 4-Channel 8A Configurable Buck DC/DCs from Analog Devices, please fill in the form below to register for your FREE samples now.
 

Requesting....

 

To register for a FREE evaluation board and samples of LTC3372 Low IQ Buck Controller Plus 4-Channel 8A Configurable Buck DC/DCs from Analog Devices, please fill in the form below

First name *
Last name *
Company *
Telephone *
Email Address *
Project Name
Project Volume  *
Project Description

Interested in more FREE samples for your design? Click here to try our Ezysample service.

FREE samples for UK and Ireland customers only, subject to availability.

 

 

You may also be interested in

Design Techniques for Signal Conditioning with Anglia and Analog Devices, register now for a Free Workshop place

Anglia and Analog Devices are hosting two in depth technical workshops in April. The workshops will focus on the exploration of the signal chain and techniques to quantify noise, signal conditioning of analog /digital converters.


Introducing the AD4130-8 Ultra Low Power 24-Bit Sigma-Delta ADC from Analog Devices. Evaluation board and samples available from Anglia.

The AD4130-8 from Analog Devices is an ultra low power, high precision, measurement solution for low bandwidth battery operated applications.


Maxim Integrated products now available from Anglia Live

Maxim Integrated is now part of Analog Devices - The collective expertise from Maxim and Analog Devices in areas like automotive, connected factory, electrification and digital healthcare are helping to make "what if" become "what is".


Introducing the ADE9430 High Performance Polyphase Energy and Class S Power Quality Monitoring IC from Analog Devices. Evaluation board and samples available from Anglia.

The ADE9430 from Analog Devices is a highly accurate, fully integrated, polyphase energy and power quality monitoring device.


Focus on Motion with the ADXL367 Digital output MEMS accelerometer from Analog Devices that offers excellent resolution and ultralow power consumption. Evaluation board and samples available from Anglia

The ADXL367 from Analog Devices is an ultralow power, 3-axis microelectromechanical systems (MEMS) accelerometer that consumes just 0.89 μA at a 100 Hz output data rate and 180 nA when in motion-triggered wake-up mode


Quad-Channel Isolators from Analog Devices feature Integrated DC-to-DC converter, samples and evaluation board available from Anglia

The ADuM642xA family from Analog Devices are quad-channel digital isolators with an isoPower, integrated, isolated dc-to-dc converter.


ANGLIA-LIVE.COM IS A B2B WEBSITE ONLY
© 2024 Anglia Components Plc. All rights reservedTerms & ConditionsTerms of UsePrivacy PolicyAnti Bribery Statement