DatasheetsPDF.com

Buck DC/DCs. LTC3374 Datasheet

DatasheetsPDF.com

Buck DC/DCs. LTC3374 Datasheet






LTC3374 DC/DCs. Datasheet pdf. Equivalent




LTC3374 DC/DCs. Datasheet pdf. Equivalent





Part

LTC3374

Description

8-Channel Parallelable 1A Buck DC/DCs



Feature


FEATURES n 8-Channel Independent Step-Do wn DC/DCs n Master-Slave Configurable f or Up to 4A per Output Rail with a Sing le 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 Pr ecision Enable Pin Thresholds for Auton omous Sequencing n 1MHz to 3MHz Program mable/Synchronizable Oscillator Frequen cy (2MHz Default) .
Manufacture

Linear Technology

Datasheet
Download LTC3374 Datasheet


Linear Technology LTC3374

LTC3374; n Die Temperature Monitor Output n Therm ally-Enhanced 38-Lead QFN (5mm × 7mm) and TSSOP Packages APPLICATIONS n Gener al 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 suppl y IC. The DC/DCs consist of eight synch ronous buck converte.


Linear Technology LTC3374

rs (1A each) all powered from independen t 2.25V to 5.5V input supplies. The DC/ DCs may be used independently or in par allel to achieve higher currents of up to 4A per output with a shared inductor . The common buck switching frequency m ay be programmed with an external resis tor, synchronized to an external oscill ator, or set to a default internal 2MHz clock. The operat.


Linear Technology LTC3374

ing mode for all DC/DCs may be programme d via the MODE pin. To reduce input noi se the buck converters are phased in 90 ° steps. Precision enable pin threshol ds provide reliable 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 lo go and Burst Mode ar.

Part

LTC3374

Description

8-Channel Parallelable 1A Buck DC/DCs



Feature


FEATURES n 8-Channel Independent Step-Do wn DC/DCs n Master-Slave Configurable f or Up to 4A per Output Rail with a Sing le 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 Pr ecision Enable Pin Thresholds for Auton omous Sequencing n 1MHz to 3MHz Program mable/Synchronizable Oscillator Frequen cy (2MHz Default) .
Manufacture

Linear Technology

Datasheet
Download LTC3374 Datasheet




 LTC3374
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




 LTC3374
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




 LTC3374
LTC3374
ABSOLUTE MAXIMUM RATINGS (Note 1)
VIN1-8, FB1-8, EN1-8, VCC, PGOOD_ALL,
SYNC, RT, MODE.......................................... –0.3V to 6V
TEMP................... –0.3V to Lesser of (VCC + 0.3V) or 6V
IPGOOD_ALL................................................................5mA
Operating Junction Temperature Range
(Notes 2, 3)............................................. –40°C to 150°C
Storage Temperature Range................... –65°C to 150°C
PIN CONFIGURATION
TOP VIEW
FB1 1
VIN1 2
SW1 3
SW2 4
VIN2 5
FB2 6
FB3 7
VIN3 8
SW3 9
SW4 10
VIN4 11
FB4 12
38 37 36 35 34 33 32
39
GND
13 14 15 16 17 18 19
31 FB8
30 VIN8
29 SW8
28 SW7
27 VIN7
26 FB7
25 FB6
24 VIN6
23 SW6
22 SW5
21 VIN5
20 FB5
UHF PACKAGE
38-LEAD (5mm × 7mm) PLASTIC QFN
TJMAX = 150°C, θJA = 34°C/W
EXPOSED PAD (PIN 39) IS GND, MUST BE SOLDERED TO PCB
TEMP 1
EN2 2
EN1 3
FB1 4
VIN1 5
SW1 6
SW2 7
VIN2 8
FB2 9
FB3 10
VIN3 11
SW3 12
SW4 13
VIN4 14
FB4 15
EN4 16
EN3 17
PGOOD_ALL 18
SYNC 19
TOP VIEW
39
GND
38 VCC
37 MODE
36 EN7
35 EN8
34 FB8
33 VIN8
32 SW8
31 SW7
30 VIN7
29 FB7
28 FB6
27 VIN6
26 SW6
25 SW5
24 VIN5
23 FB5
22 EN5
21 EN6
20 RT
FE PACKAGE
38-LEAD PLASTIC TSSOP
TJMAX = 150°C, θJA = 25°C/W
EXPOSED PAD (PIN 39) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC3374EUHF#PBF
LTC3374EUHF#TRPBF 3374
38-Lead (5mm × 7mm) Plastic QFN
–40°C to 125°C
LTC3374IUHF #PBF
LTC3374IUHF#TRPBF 3374
38-Lead (5mm × 7mm) Plastic QFN
–40°C to 125°C
LTC3374HUHF #PBF
LTC3374HUHF#TRPBF 3374
38-Lead (5mm × 7mm) Plastic QFN
–40°C to 150°C
LTC3374EFE #PBF
LTC3374EFE#TRPBF
LTC3374FE
38-Lead Plastic TSSOP
–40°C to 125°C
LTC3374IFE #PBF
LTC3374IFE#TRPBF
LTC3374FE
38-Lead Plastic TSSOP
–40°C to 125°C
LTC3374HFE #PBF
LTC3374HFE#TRPBF
LTC3374FE
38-Lead Plastic TSSOP
–40°C to 150°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/. Some packages are available in 500 unit reels through
designated sales channels with #TRMPBF suffix.
3374fc
For more information www.linear.com/LTC3374
3



Recommended third-party LTC3374 Datasheet






@ 2014 :: Datasheetspdf.com :: Semiconductors datasheet search & download site (Privacy Policy & Contact)