LTC3372
60V Low I Buck Controller
Q
Plus 4-Channel 8A Configurable Buck DC/DCs
FEATURES
DESCRIPTION
n
HV Buck Controller: V = 4.5V to 60V, V
= 5V/3.3V
OUT
TheLTC®3372isahighlyflexiblemultioutputpowersupply
IC. The device includes a high-performance, high voltage
(HV)step-downDC/DCswitchingregulatorcontrollerthat
drives an all N-channel synchronous power FET stage
from a 4.5V to 60V input.
IN
n
LV Buck Regulators: V
OUT1-4
= 2.25V to 5.5V,
INA-H
V
≥ 0.8V
n
8×1A LV Buck Integrated Power Stages, Configurable
as 2, 3 or 4 Output Channels
n
n
8 Unique Output Configurations (1A to 4A Per Channel)
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
poweredfromindependentinputswhichmaybeconnected
Low Total No-Load Input Supply Current (I )
Q
n
15µA HV Controller Only (5V
)
OUT
n
n
n
23μA HV Controller Only (3.3V
)
OUT
33μA HV Controller (3.3V ) Plus One LV Regulator
9μA Per Additional LV Regulator Channel
OUT
to the HV buck’s V
or to other 2.25V to 5.5V supplies.
OUT
n
n
n
n
n
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
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.
Thermally Enhanced 48-Pin 7mm × 7mm QFN Package
The LTC3372 is available in a 48-pin 7mm × 7mm
QFN package.
APPLICATIONS
All registered trademarks and trademarks are the property of their respective owners.
n
Automotive and Industrial Always-On Systems
General Purpose Multi-Channel Power Supplies
n
LV Efficiency vs Output Current
TYPICAL APPLICATION
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5mΩ
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Low Voltage Buck Regulator Configurations
C3 C2 C1 BUCK1 BUCK2 BUCK3 BUCK4
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2A
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2A
1A
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1A
2A
–
2A
2A
1A
1A
–
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1A
–
2A
2A
3A
2A
3A
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4A
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Rev. A
1
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