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LTC3372 Datasheet

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

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LTC3372
60V Low IQ Buck Controller
Plus 4-Channel 8A Configurable Buck DC/DCs
FEATURES
nn HV Buck Controller: VIN = 4.5V to 60V, VOUT = 5V/3.3V
nn LV Buck Regulators: VINA-H = 2.25V to 5.5V,
VOUT1‑4 ≥ 0.8V
nn 8×1A LV Buck Integrated Power Stages, Configurable
as 2, 3 or 4 Output Channels
nn 8 Unique Output Configurations (1A to 4A Per Channel)
nn Low Total No-Load Input Supply Current (IQ)
nn 15µA HV Controller Only (5VOUT)
nn 23μA HV Controller Only (3.3VOUT)
nn 33μA HV Controller (3.3VOUT) Plus One LV Regulator
nn 9μA Per Additional LV Regulator Channel
nn 1MHz to 3MHz Operation (HV Runs at 1/6 Frequency)
nn Programmable or Synchronizable to External Clock
nn Programmable Watchdog and Power-On Reset Delay
nn IC Die Temperature Monitor Output
nn Thermally Enhanced 48-Pin 7mm × 7mm QFN Package
APPLICATIONS
nn Automotive and Industrial Always-On Systems
nn General Purpose Multi-Channel Power Supplies
DESCRIPTION
The LTC®3372 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) synchro-
nous 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 VOUT 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.
All registered trademarks and trademarks are the property of their respective owners.
TYPICAL APPLICATION
VIN
60V MAX
4.5V MIN
47µF
×2
100k
INTVCC
INTVCC /GND
8.06k
2.2nF
100pF
0.01µF
VIN INTVCC
RUN
PGOOD
VOUTPRG
TG
BOOST
ITH
SW
LTC3372 BG
VOUT1
1.0V
2A
VOUT
TRACK/SS
GND
SSEENNSSEE+
VOUT/ EXTVCC
VVSIIWNNBAA
SVVWIINNHGH
SWB SWG
FB1 FB4
EN1 EN4
VOUT2
1.2V
2A
VOUT
VVSIIWNNDCC
SWD
SVVWIINNFEF
SWE
FB2 FB3
EN2
EN3
TEMP
PLLIN/MODE WDI
RT WDO
CT C1 C2 C3RSTB
3372 TA01a
4.7µF
0.1µF
2.2µH 5mΩ
150µF
×2
VOUT
3.3V/5V
3A*
47µF
VOUT
VOUT
VOUT4
2.5V
2A
VOUT3
1.8V
2A
100k
INTVCC
*FULL LOAD IS EQUIVALENT TO SPECIFIED LOAD CURRENT
PLUS THE FULL LOAD INPUT CURRENT FROM VOUT1-4
Document Feedback
For more information www.analog.com
LV Efficiency vs Output Current
100
90
80
70
60
50
40
30
20 VINA–H = 3.3V
10
VOUT = 1.8V
fSW = 2MHz
0
0.0001 0.001 0.01
1A Buck
2A Buck
3A Buck
4A Buck
0.1 1 4
OUTPUT CURRENT (A)
3372 TA01b
Low Voltage Buck Regulator Configurations
C3 C2 C1 BUCK1 BUCK2 BUCK3 BUCK4
0 0 0 2A 2A 2A 2A
0 0 1 3A 1A 2A 2A
0 1 0 3A 1A 1A 3A
0 1 1 4A 1A 1A 2A
1 0 0 3A
2A
3A
1 0 1 4A – 2A 2A
1 1 0 4A – 1A 3A
1 1 1 4A
4A
Rev. A
1


Analog Devices Semiconductor Electronic Components Datasheet

LTC3372 Datasheet

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

No Preview Available !

LTC3372
TABLE OF CONTENTS
Features............................................................................................................................. 1
Applications........................................................................................................................ 1
Typical Application ................................................................................................................ 1
Description......................................................................................................................... 1
Absolute Maximum Ratings...................................................................................................... 3
Order Information.................................................................................................................. 4
Electrical Characteristics......................................................................................................... 4
Typical Performance Characteristics........................................................................................... 8
Pin Functions......................................................................................................................14
Block Diagram.....................................................................................................................17
Operation.......................................................................................................................... 18
Low Voltage Regulators......................................................................................................................................... 20
Applications Information........................................................................................................23
High Voltage Buck Controller................................................................................................................................. 23
Low Voltage Buck Regulators................................................................................................................................ 33
Printed Circuit Board PCB Layout Considerations.................................................................................................. 35
Typical Applications..............................................................................................................37
Package Description.............................................................................................................42
Revision History..................................................................................................................43
Typical Application...............................................................................................................44
Related Parts......................................................................................................................44
Rev. A
2 For more information www.analog.com


Part Number LTC3372
Description 60V Low Iq Buck Controller Plus 4-Channel 8A Configurable Buck DC/DCs
Maker Analog Devices
Total Page 30 Pages
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