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Linear Technology Electronic Components Datasheet

LTC3374HUHF Datasheet

8-Channel Parallelable 1A Buck DC/DCs

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FEATURES
n 8-Channel Independent Step-Down DC/DCs
n Master-Slave Configurable for Up to 4A per Output
Rail with a Single Inductor
n Independent VIN Supplies for Each DC/DC
(2.25V to 5.5V)
n All DC/DCs Have 0.8V to VIN Output Range
n Precision Enable Pin Thresholds for Autonomous
Sequencing
n 1MHz to 3MHz Programmable/Synchronizable
Oscillator Frequency (2MHz Default)
n Die Temperature Monitor Output
n Thermally-Enhanced 38-Lead QFN (5mm × 7mm)
and TSSOP Packages
APPLICATIONS
n General Purpose Multichannel Power Supplies
n Industrial/Automotive/Communications
LTC3374
8-Channel Parallelable
1A Buck DC/DCs
DESCRIPTION
The LTC®3374 is a high efficiency multioutput power sup-
ply IC. The DC/DCs consist of eight synchronous buck
converters (1A each) all powered from independent 2.25V
to 5.5V input supplies.
The DC/DCs may be used independently or in parallel to
achieve higher currents of up to 4A per output with a shared
inductor. The common buck switching frequency may be
programmed with an external resistor, synchronized to an
external oscillator, or set to a default internal 2MHz clock.
The operating mode for all DC/DCs may be programmed
via the MODE pin.
To reduce input noise the buck converters are phased in
90° steps. Precision enable pin thresholds provide reli-
able power-up sequencing. The LTC3374 is available in a
compact 38-lead 5mm × 7mm QFN package as well as a
38-lead TSSOP package.
L, LT, LTC, LTM, Linear Technology, the Linear logo and Burst Mode are registered trademarks
of Linear Technology Corporation. All other trademarks are the property of their respective
owners.
TYPICAL APPLICATION
8-Channel 1A Multioutput Buck Regulator
2.7V TO 5.5V
VIN1 2.2µH
VCC
BUCK1
0.8V TO VIN1
UP TO 1A
22µF
LTC3374
MASTER
VIN2
BUCK2
2.2µH
SLAVE
0.8V TO VIN2
UP TO 1A
22µF
EN1
EN2
EN3
EN4
EN5
VIN7
EN6
BUCK7
EN7
EN8
PGOOD_ALL
TEMP
MODE
VIN8
BUCK8
MASTER
2.2µH
MASTER
2.2µH
••
SLAVE
SLAVE
SYNC
RT
0.8V TO VIN7
UP TO 1A
10µF
0.8V TO VIN8
UP TO 1A
10µF
3374 TA01a
100
90
80
70
60
50
40
30
20
10
0
0
Buck Efficiency vs ILOAD
1A BUCK
2A BUCK
3A BUCK
4A BUCK
FORCED CONTINUOUS MODE
VIN = 3.3V, VOUT = 1.8V
fOSC = 1MHz, L = 3.3µH
1000
2000
3000
LOAD CURRENT (mA)
4000
3374 TA01b
For more information www.linear.com/LTC3374
3374fc
1


Linear Technology Electronic Components Datasheet

LTC3374HUHF Datasheet

8-Channel Parallelable 1A Buck DC/DCs

No Preview Available !

LTC3374
TABLE OF CONTENTS
Features...................................................... 1
Applications................................................. 1
Typical Application ......................................... 1
Description.................................................. 1
Absolute Maximum Ratings............................... 3
Pin Configuration........................................... 3
Order Information........................................... 3
Electrical Characteristics.................................. 4
Typical Performance Characteristics.................... 6
Pin Functions............................................... 11
Block Diagram.............................................. 13
Operation................................................... 14
Buck Switching Regulators...................................... 14
Buck Regulators with Combined Power Stages....... 14
Power Failure Reporting Via PGOOD_ALL Pin......... 15
Temperature Monitoring and Overtemperature
Protection................................................................ 15
Programming the Operating Frequency................... 15
Applications Information................................. 17
Buck Switching Regulator Output Voltage
and Feedback Network............................................. 17
Buck Regulators...................................................... 17
Combined Buck Regulators..................................... 17
Input and Output Decoupling Capacitor Selection... 17
PCB Considerations................................................. 19
Package Description...................................... 23
Revision History........................................... 25
Typical Application........................................ 26
Related Parts............................................... 26
3374fc
2
For more information www.linear.com/LTC3374


Part Number LTC3374HUHF
Description 8-Channel Parallelable 1A Buck DC/DCs
Maker Linear
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