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Linear Technology Electronic Components Datasheet

LTC3374AIFE Datasheet

High Accuracy 8-Channel Parallelable 1A Buck DC/DCs

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LTC3374A
High Accuracy 8-Channel
Parallelable 1A Buck DC/DCs
Features
Description
nn 8-Channel 1A Independent Step-Down DC/DCs
nn Master-Slave Configurable for Up to 4A of Output
Current with a Single Inductor
nn Independent VIN Supplies for Each DC/DC
(2.25V to 5.5V)
nn All DC/DCs Have 0.8V to VIN Output Range
nn ±1% VFB Accuracy, for Buck 1 (1A to 4A)
nn ±1% PGOOD Accuracy
nn Precision Enable Pin Thresholds for Autonomous
Sequencing
nn 1MHz to 3MHz Programmable/Synchronizable
Oscillator Frequency (2MHz Default)
nn Die Temperature Monitor Output
nn Thermally Enhanced 38-Lead 5mm × 7mm QFN and
TSSOP Packages
nn Pin-Compatible with LTC3374
Applications
nn General Purpose Multichannel Power Supplies
nn Industrial/Automotive/Communications
The LTC®3374A is a multioutput power supply IC consisting
of eight synchronous 1A buck converters, all powered from
independent 2.25V to 5.5V input supplies. An upgraded
pin-compatible version of the LTC3374, the LTC3374A,
has higher efficiency, improved output voltage accuracy
and an added overvoltage (OV) indicator.
The DC/DCs may be used independently or in parallel to
achieve higher output currents of up to 4A 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 simplify power-
up sequencing. The LTC3374A is available in a 38-lead
5mm × 7mm QFN package as well as a 38-lead exposed
pad 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
Eight Synchronous 1A Buck Regulators
2.25V TO 5.5V
VIN1
SW1
EN1
FB1
BUCK 1
0.8V TO VIN1
UP TO 1A
2.25V TO 5.5V
VIN2
SW2
EN2
FB2
THE EIGHT BUCKS CAN
BE CONFIGURED IN 15
DIFFERENT MASTER/SLAVE
COMBINATIONS
••
LTC3374A
••
2.25V TO 5.5V
VIN8
SW8
2.7V TO 5.5V
EN8
FB8
VCC
MODE
SYNC
PGOOD_ALL
RT
TEMP
GND
3374A TA01a
BUCK 2
0.8V TO VIN2
UP TO 1A
BUCK 8
0.8V TO VIN8
UP TO 1A
100
90
80
70
60
50
40
30
20
10
0
1m
Buck Efficiency vs ILOAD
fOSC = 1MHz
VOVUITN==13..83VV
VOUT = 1.8V
Burst Mode OPERATION
1A BUCK, L = 4.7µH, L DCR = 40mΩ
2A BUCK, L = 2.2µH, L DCR = 13mΩ
3A BUCK, L = 1.8µH, L DCR = 10mΩ
4A BUCK, L = 1.0µH, L DCR = 8mΩ
10m
100m
LOAD CURRENT (A)
1
4
3374A TA01b
For more information www.linear.com/LTC3374A
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Linear Technology Electronic Components Datasheet

LTC3374AIFE Datasheet

High Accuracy 8-Channel Parallelable 1A Buck DC/DCs

No Preview Available !

LTC3374A
Absolute Maximum Ratings (Note 1)
VIN1-8, FB1-8, EN1-8, VCC, PGOOD_ALL,
SYNC, RT, TEMP........................................... –0.3V to 6V
MODE................... –0.3V to Lesser of (VCC + 0.3V) or 6V
IPGOOD_ALL................................................................5mA
ISW1-8........................................................................2.6A
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 http://www.linear.com/product/LTC3374A#orderinfo
LEAD FREE FINISH
LTC3374AEUHF#PBF
TAPE AND REEL
PART MARKING*
LTC3374AEUHF#TRPBF 3374A
PACKAGE DESCRIPTION
38-Lead (5mm × 7mm) Plastic QFN
TEMPERATURE RANGE
–40°C to 125°C
LTC3374AIUHF #PBF
LTC3374AIUHF#TRPBF 3374A
38-Lead (5mm × 7mm) Plastic QFN
–40°C to 125°C
LTC3374AHUHF #PBF
LTC3374AHUHF#TRPBF 3374A
38-Lead (5mm × 7mm) Plastic QFN
–40°C to 150°C
LTC3374AEFE #PBF
LTC3374AEFE#TRPBF LTC3374AFE
38-Lead Plastic TSSOP
–40°C to 125°C
LTC3374AIFE #PBF
LTC3374AIFE#TRPBF LTC3374AFE
38-Lead Plastic TSSOP
–40°C to 125°C
LTC3374AHFE #PBF
LTC3374AHFE#TRPBF LTC3374AFE
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.
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For more information www.linear.com/LTC3374A


Part Number LTC3374AIFE
Description High Accuracy 8-Channel Parallelable 1A Buck DC/DCs
Maker Linear
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