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Linear Technology Electronic Components Datasheet

LTC3370HUH Datasheet

4-Channel 8A Configurable Buck DC/DCs

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LTC3370
4-Channel 8A Configurable
Buck DC/DCs
Features
Description
n 8 × 1A Power Stages Configurable as 2, 3, or 4 Output
Channels
n 8 Unique Output Configurations (1A to 4A Per Channel)
n Independent VIN Supplies for Each DC/DC
(2.25V to 5.5V)
n Low Total No Load Supply Current:
n Zero Current In Shutdown (All Channels Off)
n 63µA One Channel Active in Burst Mode® Operation
n 18µA Per Additional Channel
n Precision Enable Pin Thresholds for Autonomous
Sequencing
n 1MHz to 3MHz RT Programmable Frequency
(2MHz Default) or PLL Synchronization
n Temp Monitor Indicates Die Temperature
n PGOODALL Pin Indicates All Enabled Bucks Are in
Regulation
n 32-Lead 5mm × 5mm QFN Package
Applications
n General Purpose Multichannel Power Supplies:
Automotive, Industrial, Distributed Power Systems
The LTC®3370 is a highly flexible multioutput power
supply IC. The device includes four synchronous buck
converters, configured to share eight 1A power stages,
each of which is powered from independent 2.25V to
5.5V inputs.
The DC/DCs are assigned to one of eight power configu-
rations via pin programmable C1-C3 pins. 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 PLL/MODE pin for Burst Mode or forced continuous
mode operation. A PGOODALL output indicates when all
enabled DC/DCs are within a specified percentage of their
final output value.
To reduce input noise, the buck converters are phased
in 90° steps. Precision enable pin thresholds facilitate
reliable power-up sequencing. The LTC3370 is available
in a 32-lead 5mm × 5mm QFN package.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
Typical Application
VOUT1
1.2V/2A
2.25V TO 5.5V
2.2µH
324k
649k
VOUT2
1.5V/2A
2.25V TO 5.5V
2.2µH
715k
649k
2.7V TO 5.5V
VINA
VCC
VINE
VINB
VINF
SWA
SWE
SWB
SWF
FB1
FB3
EN1
EN3
LTC3370
VINC
VIND
SWC
SWD
VING
VINH
SWG
SWH
FB2
FB4
EN2
EN4
2.25V TO 5.5V
2.2µH
806k
649k
2.5V TO 5.5V
2.2µH
665k
309k
PLL/MODE TEMP
RT
PGOODALL
402k C1 C2 C3 GND
3370 TA01a
VOUT3
1.8V/2A
VOUT4
2.5V/2A
Buck Efficiency vs ILOAD
100
90
80
70
60
Burst Mode OPERATION
50
VIN = 3.3V
VOUT = 1.8V
40
f OSC = 1MHz
L = 3.3µH
30
1A BUCK
20
2A BUCK
10
3A BUCK
4A BUCK
0
1
10
100
1000 4000
LOAD CURRENT (mA)
3370 TA01b
C3 C2 C1 BUCK1 BUCK2 BUCK3 BUCK4
0
0
0
2A 2A 2A 2A
0
0
1
3A 1A 2A 2A
0
1
0
3A 1A 1A 3A
0
1
1
4A 1A 1A 2A
1
0
0
3A
2A
3A
1
0
1
4A
2A 2A
1
1
0
4A
1A 3A
1
1
1
4A
4A
3370fb
For more information www.linear.com/LTC3370
1


Linear Technology Electronic Components Datasheet

LTC3370HUH Datasheet

4-Channel 8A Configurable Buck DC/DCs

No Preview Available !

LTC3370
Table of Contents
Features............................................................................................................................. 1
Applications........................................................................................................................ 1
Typical Application ................................................................................................................ 1
Description......................................................................................................................... 1
Absolute Maximum Ratings...................................................................................................... 3
Order Information.................................................................................................................. 3
Pin Configuration.................................................................................................................. 3
Electrical Characteristics......................................................................................................... 4
Typical Performance Characteristics........................................................................................... 6
Pin Functions......................................................................................................................12
Block Diagram.....................................................................................................................14
Operation.......................................................................................................................... 15
Buck Switching Regulators.....................................................................................................................................15
Buck Regulators with Combined Power Stages......................................................................................................15
Power Failure Reporting Via PGOODALL Pin..........................................................................................................16
Temperature Monitoring and Overtemperature Protection......................................................................................16
Programming the Operating Frequency..................................................................................................................16
Applications Information........................................................................................................17
Buck Switching Regulator Output Voltage and Feedback Network.........................................................................17
Buck Regulators.....................................................................................................................................................17
Combined Buck Power Stages................................................................................................................................17
Input and Output Decoupling Capacitor Selection..................................................................................................17
PCB Considerations................................................................................................................................................19
Typical Applications..............................................................................................................20
Package Description.............................................................................................................23
Typical Application...............................................................................................................24
Related Parts......................................................................................................................24
3370fb
2
For more information www.linear.com/LTC3370


Part Number LTC3370HUH
Description 4-Channel 8A Configurable Buck DC/DCs
Maker Linear
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