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LTC3874 Datasheet

PolyPhase Step-Down Synchronous Slave Controller

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LTC3874
PolyPhase Step-Down
Synchronous Slave Controller with
Sub-Milliohm DCR Sensing
FEATURES
n Phase Extender for High Phase Count Voltage Rails
n Accurate Phase-to-Phase Current Sharing
n Sub-Milliohm DCR Current Sensing
n Phase-Lockable Fixed Frequency 250kHz to 1MHz
n Immediate Response to Master IC's Fault
n Up to 12 Phase Operation
n Wide VIN Range: 4.5V to 38V
n VOUT Up to 5.5V
n Proprietary Current Mode Control Loop
n Programmable CCM/DCM Operation
n Programmable Phase Shift Control
n Dual N-Channel MOSFET Gate Drivers
n 28-Lead (4mm × 5mm) QFN Package
APPLICATIONS
n High Current Distributed Power Systems
n Telecom, Datacom, and Storage Systems
n Intelligent Energy Efficient Power Regulation
DESCRIPTION
The LTC®3874 is a dual PolyPhase® current mode synchro-
nous step-down slave controller. It enables high current,
multi-phase applications when paired with a companion
master controller by extending the phase count. Compat-
ible master controllers include the LTC3866, LTC3875 and
LTC3774. The LTC3874 employs a unique architecture that
enhances the signal-to-noise ratio of the current sense
signal, allowing the use of sub-milliohm DC resistance
power inductors to maximize efficiency while reduc-
ing switching jitter. Its peak current mode architecture
allows for accurate phase to phase current sharing even
for dynamic loads.
Effectively working with a master controller, the LTC3874
supports all the programmable features as well as fault
protection. The constant operating frequency can be
synchronized to an external clock or linearly programmed
from 250KHz to 1MHz.
L, LT, LTC, LTM, Linear Technology, the Linear logo, PolyPhase and Burst Mode are registered
trademarks of Linear Technology Corporation. All other trademarks are the property of their
respective owners. Protected by U.S. Patents, including 5481178, 5705919, 5929620, 6100678,
6144194, 6177787, 6304066, 6580258.
TYPICAL APPLICATION
VIN
4.7µF
90k
VIN INTVCC
LTC3874 TG0
PHASMD BOOST0
LOWDCR SW0
EXTVCC
BG0
FREQ
ILIM
ISENSE0+
ISENSE0–
MASTER
RUN0
CONTROLLER RUN1
GPIO0
VSENSE0+
VSENSE1+
GPIO1
PGOOD0
PGOOD1
ITH0
ITH1
SYNC
RUN0
RUN1
FAULT0
FAULT1
MODE0
MODE1
ITH0
ITH1
SYNC
TG1
BOOST1
SW1
BG1
GND
ISENSE1+
ISENSE1–
0.1µF
931Ω
0.22µF
0.1µF
931Ω
0.22µF
0.33µH
(0.32mΩ DCR)
+ 470µF
×2
VOUT
1.8V
120A
0.33µH
(0.32mΩ DCR)
+ 470µF
×2
3874 TA02
For more information www.linear.com/LTC3874
Dual Phase Efficiency and Power Loss
vs Output Current, Sub-Milliohm DCR
vs Traditional DCR
100 VIN = 12V
VOUT = 1.8V
95 CCM
14
12
90
85
80
75
70
0
EFFICIENCY
10
8
POWER LOSS
6
0.32mΩ 4
1.5mΩ
0.32mΩ
2
1.5mΩ
0
10 20 30 40 50 60
LOAD CURRENT (A)
3874 TA01b
3874f
1


Linear Technology Electronic Components Datasheet

LTC3874 Datasheet

PolyPhase Step-Down Synchronous Slave Controller

No Preview Available !

LTC3874
ABSOLUTE MAXIMUM RATINGS
(Note 1)
VIN.............................................................. −0.3V to 40V
BOOST0, BOOST1....................................... −0.3V to 46V
SW0, SW1..................................................... −5V to 40V
(BOOST0-SW0), (BOOST1-SW1).................. −0.3V to 6V
ISENSE0+, ISENSE0–, ISENSE1+, ISENSE1–.... −0.3V to INTVCC
EXTVCC, INTVCC, RUN0, RUN1..................... −0.3V to 6V
MODE0, MODE1, ILIM, LOWDCR,
PHASMD, FREQ..................................... −0.3V to INTVcc
SYNC, FAULT0, FAULT1, ITH0, ITH1.......... −0.3V to INTVcc
INTVCC Peak Output Current.................................100mA
Operating Junction Temperature Range
(Note 2)................................................... −40°C to 125°C
Storage Temperature Range................... −65°C to 150°C
PIN CONFIGURATION
TOP VIEW
28 27 26 25 24 23
MODE0 1
ISENSE0+ 2
ISENSE0– 3
22 BOOST0
21 BG0
20 VIN
RUN0 4
RUN1 5
ISENSE1– 6
ISENSE1+ 7
29 19 INTVCC
GND 18 EXTVCC
17 BG1
16 BOOST1
MODE1 8
15 SW1
9 10 11 12 13 14
UFD PACKAGE
28-LEAD (4mm × 5mm) PLASTIC QFN
θJA = 43°C/W, θJC = 3.4°C/W
EXPOSED PAD (PIN 29) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC3874EUFD#PBF
LTC3874EUFD#TRPBF 3874
28-Lead (4mm × 5mm) Plastic QFN
–40°C to 125°C
LTC3874IUFD#PBF
LTC3874IUFD#TRPBF 3874
28-Lead (4mm × 5mm) Plastic QFN
–40°C to 125°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
Consult LTC Marketing for information on nonstandard lead based finish parts.
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/
3874f
2 For more information www.linear.com/LTC3874


Part Number LTC3874
Description PolyPhase Step-Down Synchronous Slave Controller
Maker Linear
Total Page 28 Pages
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