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Linear Technology Electronic Components Datasheet

LTC3375IUK Datasheet

Parallelable 1A Buck DC/DCs

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LTC3375
8-Channel Programmable,
Parallelable 1A Buck DC/DCs
Features
n 8-Channel Independent Step-Down DC/DCs
n Master-Slave Configurable for Up to 4A Per Output
Channel with a Single Inductor
n Independent VIN Supply for Each DC/DC
(2.25V to 5.5V)
n All DC/DCs Have 0.425V to VIN Output Voltage Range
n Precision Enable Pin Thresholds for Autonomous
Sequencing (or I2C Control)
n 1MHz to 3MHz Programmable/Synchronizable
Oscillator Frequency (2MHz Default)
n I2C Selectable Phasing (90° Steps) Per Channel
n Programmable Power-On Reset/Watch Dog/
Pushbutton Timing
n Die Temperature Monitor Output
n 48-Lead (7mm × 7mm) QFN Package
Applications
n General Purpose Multichannel Power Supplies
n Industrial/Automotive/Communications
Description
The LTC®3375 is a digitally programmable high efficiency
multioutput power supply IC. The DC/DCs consist of eight
synchronous buck converters (IOUT up to 1A each) all
powered from independent 2.25V to 5.5V input supplies.
DC/DC enables, output voltages, operating modes, and
phasing may all be independently programmed over I2C
or used in standalone mode via simple I/O with power-up
defaults. The DC/DCs may be used independently or in
parallel to achieve higher output currents of up to 4A per
output with a shared inductor. Alarm levels for high die
temperature may also be programmed via I2C with a mask-
able IRQ output for monitoring DC/DC and system faults.
Pushbutton ON/OFF/RESET control, power-on reset, and
a watchdog timer provide flexible and reliable power-up
sequencing and system monitoring. The LTC3375 is avail-
able in a low profile 48-lead 7mm × 7mm 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
8-Channel 1A Multioutput Buck Regulator
4V TO 40V
ALWAYS-ON
LDO
PB
VSHNT
VIN1
SW1
VCC
FB1
LTC3375
FBVCC
ON
VIN2
KILL
SW2
PB
2.2µH
MASTER
2.2µH
0.425V TO VIN1
UP TO 1A
10µF
SLAVE
0.425V TO VIN2
UP TO 1A
10µF
FB2
EN1
EN2
EN3
EN4
EN5
EN6
EN7
EN8
RST
TEMP
WDI
WD0
2
IRQ
I2C
SYNC
RT
MASTER
VIN7 2.2µH
SW7
FB7
MASTER
••
SLAVE
0.425V TO VIN7
UP TO 1A
10µF
VIN8
SW8
FB8
CT
2.2µH
SLAVE
0.425V TO VIN8
UP TO 1A
10µF
3375 TA01a
Buck Efficiency vs Load
100
90
80
1A BUCK
2A BUCK
70
3A BUCK
60
4A BUCK
50
40
30 Burst Mode OPERATION
20
VIN = 3.3V
VOUT = 1.8V
10 fOSC = 2MHz
L = 2.2µH
0
1
10
100
1000
LOAD CURRENT (mA)
3375 TA01b
For more information www.linear.com/3375
3375fd
1


Linear Technology Electronic Components Datasheet

LTC3375IUK Datasheet

Parallelable 1A Buck DC/DCs

No Preview Available !

LTC3375
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.................... 7
Pin Functions............................................... 12
Block Diagram.............................................. 15
Operation................................................... 16
Buck Switching Regulators...................................... 16
Buck Regulators with Combined Power Stages....... 16
Pushbutton Interface............................................... 17
Power-Up and Power-Down Via Pushbutton............ 17
Power-Up and Power-Down Via Enable Pin or I2C... 19
I2C Interface............................................................20
I2C Bus Speed..........................................................20
I2C Start and Stop Conditions..................................20
I2C Byte Format.......................................................20
I2C Acknowledge.....................................................20
I2C Slave Address.................................................... 21
I2C Sub-Addressed Writing......................................22
I2C Bus Write Operation ..........................................22
I2C Bus Read Operation...........................................22
Error Condition Reporting Via RST and IRQ Pins.....22
Temperature Monitoring and
Overtemperature Protection....................................23
RESET_ALL Functionality........................................ 24
Programming the Operating Frequency................... 24
VCC Shunt Regulator................................................25
Watchdog Timer......................................................25
Applications Information................................. 26
Buck Switching Regulator Output Voltage and
Feedback Network...................................................26
Buck Regulators......................................................26
Combined Buck Regulators.....................................26
VCC Shunt Regulator................................................ 28
Input and Output Decoupling Capacitor Selection ..29
Choosing the CT Capacitor.......................................29
Programming the Global Register............................29
Programming the RST and IRQ Mask Registers......29
Status Byte Read Back............................................29
PCB Considerations................................................. 31
Typical Applications....................................... 32
Package Description...................................... 35
Typical Application........................................ 36
Related Parts............................................... 36
3375fd
2
For more information www.linear.com/3375


Part Number LTC3375IUK
Description Parallelable 1A Buck DC/DCs
Maker Linear
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