LTC3372

60V Low I_Q Buck Controller Plus 4-Channel 8A Configurable Buck DC/DCs

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Overview

Features and Benefits
Product Details

Features and Benefits

HV Buck Controller: V_IN = 4.5V to 60V, V_OUT = 5V/3.3V
LV Buck Regulators: V_INA-H = 2.25V to 5.5V, V_OUT1-4 ≥ 0.8V
8×1A 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 (I_Q)
- 15µA HV Controller Only (5V_OUT)
- 23μA HV Controller Only (3.3V_OUT)
- 33μA HV Controller (3.3V_OUT) Plus One LV Regulator
- 9μA Per Additional LV Regulator Channel

1MHz to 3MHz Operation (HV Runs at 1/6 Frequency)
Programmable or Synchronizable to External Clock
Programmable Watchdog and Power-On Reset Delay
IC Die Temperature Monitor Output
Thermally Enhanced 48-Pin 7mm × 7mm QFN Package

Product Details

The LTC3372 is a highly flexible multioutput power supply IC. The device includes a high-performance, high voltage (HV) step-down DC/DC switching regulator controller that drives an all N-channel synchronous power FET stage from a 4.5V to 60V input.

The LTC3372 also includes four low voltage (LV) synchronous buck regulators that can be programmed by the C1-C3 pins to share eight 1A integrated power stages in one of eight possible configurations. Each power stage is powered from independent inputs which may be connected to the HV buck’s V_OUT or to other 2.25V to 5.5V supplies.

The CT pin programs timing parameters of the watchdog timer and LV outputs’ Power-On Reset (RST). Precision enable thresholds facilitate reliable power-up sequencing.

The LTC3372 is available in a 48-pin 7mm × 7mm QFN package.

Applications

Automotive and Industrial Always-On Systems
General Purpose Multi-Channel Power Supplies

Product Categories

Power Management

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Product Lifecycle Recommended for New Designs

This product has been released to the market. The data sheet contains all final specifications and operating conditions. For new designs, ADI recommends utilization of these products.

Evaluation Kits (1)

DC2419A

LTC3372EUK#PBF Demo Board | 6V ≤ VIN ≤ 60V, VOUT_HV = 5V or 3.3V @ 10A; VOUT1 =1.2V @2A, VOUT2 =1.8V @2A, VOUT3 =2.5V @2A, VOUT4 =3.3V @2A

DC2419A

View Detailed Evaluation Kit Information

Demonstration circuit 2419A 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 (V_{OUT_HV}) is nominally 5V but can be configured for either 5V or 3.3V with the V_OUTPRG pin. V_{OUT_HV} supplies power to the configurable buck regulator. This regulator provides four low voltage (LV) outputs labelled V_OUT1-4. These outputs are 1.2V/2A, 1.8V/2A, 2.5V/2A and 3.3V/2A respectively. When V_{OUT_HV} is configured for 5V, it can supply 6A to the external loads with full load on VOUT1-4. With no load on V_OUT1-4, V_{OUT_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 V_{OUT_HV} is programmed for 3.3V, then V_OUT4 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 I_Q current of the LTC3372 provides high efficiency at light loads. When the V_{OUT_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.

The LTC3372 data sheet provides a complete description of the IC operation and application information. The data sheet must be read in conjunction with the quick start guide.

Features & Benefits

Selectable light load operating modes of:
- FCM
- Pulse-skipping (HV) and Burst Mode operation (LV)
- Burst Mode operation
PLLIN pin to synchronize the LV regulators over a 1MHz to 3MHz range (166kHz to 500kHz for the HV converter)
Watch dog circuit
TEMP pin to monitor the junction temperature of the LTC3372
PGOOD pin for the HV converter and RST pin for the LV regulators

Resources

Documentation & Resources

Data Sheets

LTC3372: 60V Low IQ Buck Controller Plus 4-Channel 8A Configurable Buck DC/DCs Data Sheet (Rev. A)
6/18/2018

PDF

2 M

Design Notes

Press Releases

60V Low IQ Buck Controller Plus 4-Channel 8A Configurable Buck DC/DCs
4/21/2022

Tools & Simulations

LTspice

LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.

LTspice downloads and documentation

Models for the following parts are available in LTspice:

LTC3372

Design Resources

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal.View our quality and reliability program and certifications for more information.

Part Number	Material Declaration	Reliability Data	Pin/Package Drawing	CAD Symbols, Footprints & 3D Models
LTC3372EUK#PBF	Material Declaration	Reliability Data	48-Lead QFN (7mm x 7mm x 0.75mm w/ EP)	Ultra Librarian SamacSys
LTC3372EUK#TRPBF	Material Declaration	Reliability Data	48-Lead QFN (7mm x 7mm x 0.75mm w/ EP)	Ultra Librarian SamacSys
LTC3372HUK#PBF	Material Declaration	Reliability Data	48-Lead QFN (7mm x 7mm x 0.75mm w/ EP)	Ultra Librarian SamacSys
LTC3372HUK#TRPBF	Material Declaration	Reliability Data	48-Lead QFN (7mm x 7mm x 0.75mm w/ EP)	Ultra Librarian SamacSys
LTC3372IUK#PBF	Material Declaration	Reliability Data	48-Lead QFN (7mm x 7mm x 0.75mm w/ EP)	Ultra Librarian SamacSys
LTC3372IUK#TRPBF	Material Declaration	Reliability Data	48-Lead QFN (7mm x 7mm x 0.75mm w/ EP)	Ultra Librarian SamacSys
Wafer Fabrication Data

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Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.