LTC3374_15 Datasheet, PDF (1/26 Pages) Linear Technology – 8-Channel Parallelable 1A Buck DC/DCs

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
V_IN1
V_CC
BUCK1
0.8V TO V_IN1
UP TO 1A
LTC3374
MASTER
V_IN2
BUCK2
SLAVE
0.8V TO V_IN2
UP TO 1A
EN1
EN2
EN3
EN4
EN5
V_IN7
EN6
BUCK7
EN7
EN8
PGOOD_ALL
TEMP
MODE
V_IN8
BUCK8
MASTER
MASTER
•
••
SLAVE
SLAVE
0.8V TO V_IN7
UP TO 1A
0.8V TO V_IN8
UP TO 1A
SYNC _RT
3374 TA01a
100
90
80
70
60
50
40
30
20
10
0
0
Buck Efficiency vs I_LOAD
SINGLE BUCK
DUAL BUCK
TRIPLE BUCK
QUAD BUCK
FORCED CONTINUOUS MODE
V_IN = 3.3V, V_OUT = 1.8V
f_OSC = 1MHz, L = 3.3µH
1000
2000
3000
LOAD CURRENT (mA)
4000
3374 TA01b
For more information www.linear.com/LTC3374
3374fa
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