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LTC3374EUHF#PBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P26
LTC3374
1
3374fc
For more information www.linear.com/LTC3374
TYPICAL APPLICATION
FEATURES DESCRIPTION
8-Channel Parallelable
1A Buck DC/DCs
The LT C
®
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.
8-Channel 1A Multioutput Buck Regulator
Buck Efficiency vs I
LOAD
APPLICATIONS
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 V
IN
Supplies for Each DC/DC
(2.25V to 5.5V)
n
All DC/DCs Have 0.8V to V
IN
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
n
General Purpose Multichannel Power Supplies
n
Industrial/Automotive/Communications
L, LT , LT C , LT M, 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.
0.8V TO V
IN1
UP TO 1A
BUCK1
2.7V TO 5.5V
V
IN1
BUCK2
V
IN2
BUCK7
V
IN7
BUCK8
V
IN8
V
CC
0.8V TO V
IN2
UP TO 1A
SLAVE
MASTER
SLAVE
MASTER
SLAVE
MASTER
EN1
EN2
EN3
EN4
EN5
EN6
EN7
EN8
PGOOD_ALL
TEMP
MODE
SYNC
0.8V TO V
IN7
UP TO 1A
0.8V TO V
IN8
UP TO 1A
RT
LTC3374
3374 TA01a
•
•
•
2.2µH
22µF
2.2µH
22µF
2.2µH
10µF
2.2µH
10µF
LOAD CURRENT (mA)
0
0
EFFICIENCY (%)
10
30
40
50
100
70
1000
2000
3374 TA01b
20
80
90
60
3000
4000
FORCED CONTINUOUS MODE
V
IN
= 3.3V, V
OUT
= 1.8V
f
OSC
= 1MHz, L = 3.3µH
1A BUCK
2A BUCK
3A BUCK
4A BUCK
LTC3374
2
3374fc
For more information www.linear.com/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
LTC3374
3
3374fc
For more information www.linear.com/LTC3374
PIN CONFIGURATION
ABSOLUTE MAXIMUM RATINGS
V
IN1-8
, FB1-8, EN1-8, V
CC
, PGOOD_ALL,
SYNC, RT, MODE
......................................... –0.3V to 6V
TEMP
.................. –0.3V to Lesser of (V
CC
+ 0.3V) or 6V
I
PGOOD_ALL
...............................................................5mA
(Note 1)
13 14 15 16
TOP VIEW
39
GND
UHF PACKAGE
38-LEAD (5mm × 7mm) PLASTIC QFN
17 18 19
38 37 36 35 34 33 32
24
25
26
27
28
29
30
31
8
7
6
5
4
3
2
1FB1
V
IN1
SW1
SW2
V
IN2
FB2
FB3
V
IN3
SW3
SW4
V
IN4
FB4
FB8
V
IN8
SW8
SW7
V
IN7
FB7
FB6
V
IN6
SW6
SW5
V
IN5
FB5
EN1
EN2
TEMP
V
CC
MODE
EN7
EN8
EN4
EN3
PGOOD_ALL
SYNC
RT
EN6
EN5
23
22
21
20
9
10
11
12
T
JMAX
= 150°C, θ
JA
= 34°C/W
EXPOSED PAD (PIN 39) IS GND, MUST BE SOLDERED TO PCB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
TOP VIEW
FE PACKAGE
38-LEAD PLASTIC TSSOP
38
37
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
21
20
TEMP
EN2
EN1
FB1
V
IN1
SW1
SW2
V
IN2
FB2
FB3
V
IN3
SW3
SW4
V
IN4
FB4
EN4
EN3
PGOOD_ALL
SYNC
V
CC
MODE
EN7
EN8
FB8
V
IN8
SW8
SW7
V
IN7
FB7
FB6
V
IN6
SW6
SW5
V
IN5
FB5
EN5
EN6
RT
39
GND
T
JMAX
= 150°C, θ
JA
= 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
LTC3374
IFE #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 LT C 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.
Operating Junction Temperature Range
(Notes 2, 3)
............................................ –40°C to 150°C
Storage Temperature Range
.................. –65°C to 150°C
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LTC3374EUHF#PBF

Mfr. #:
Buy LTC3374EUHF#PBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators 8-Channel Programmable, Parallelable 1A Buck DC-DCs
Lifecycle:
New from this manufacturer.
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