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Linear Technology Electronic Components Datasheet

LTC3861 Datasheet

Multiphase Step-Down Voltage Mode DC/DC Controller

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LTC3861
Features
Dual, Multiphase Step-Down
Voltage Mode DC/DC Controller
with Accurate Current Sharing
Description
n Operates with Power Blocks, DrMOS or External
Gate Drivers and MOSFETs
n Constant-Frequency Voltage Mode Control with
Accurate Current Sharing
n ±0.75% 0.6V Voltage Reference
n Dual Differential Output Voltage Sense Amplifiers
n Multiphase Capability—Up to 12-Phase Operation
n Programmable Current Limit
n Safely Powers a Prebiased Load
n Programmable or PLL-Synchronizable Switching
Frequency Up to 2.25MHz
n Lossless Current Sensing Using Inductor DCR or
Precision Current Sensing with Sense Resistor
n VCC Range: 3V to 5.5V
n VIN Range: 3V to 24V
n Power Good Output Voltage Monitor
n Output Voltage Tracking Capability
n Programmable Soft-Start
n Available in a 36-Pin 5mm × 6mm QFN Package
Applications
n High Current Distributed Power Systems
n DSP, FPGA and ASIC Supplies
n Datacom and Telecom Systems
n Industrial Power Supplies
L, LT, LTC, LTM, PolyPhase, Linear Technology and the Linear logo are registered trademarks
of Linear Technology Corporation. All other trademarks are the property of their respective
owners. Protected by U.S. Patents, including 6144194, 5055767
The LTC®3861 is a dual PolyPhase® synchronous step-
down switching regulator controller for high current
distributed power systems, digital signal processors, and
other telecom and industrial DC/DC power supplies. It uses
a constant-frequency voltage mode architecture combined
with very low offset, high bandwidth error amplifiers and a
remote output sense differential amplifier per channel for
excellent transient response and output regulation.
The controller incorporates lossless inductor DCR current
sensing to maintain current balance between phases and to
provide overcurrent protection. The chip operates from a
VCC supply between 3V and 5.5V and is designed for step-
down conversion from VIN between 3V and 24V to output
voltages between 0.6V and VCC – 0.5V.
The TRACK/SS pins provide programmable soft-start or
tracking functions. Inductor current reversal is disabled
during soft-start to safely power prebiased loads. The
constant operating frequency can be synchronized to an
external clock or linearly programmed from 250kHz to
2.25MHz. Up to six LTC3861 controllers can operate in
parallel for 1-, 2-, 3-, 4-, 6- or 12-phase operation.
The LTC3861isavailableina36-pin 5mm × 6mmQFNpack-
age. LTC3861-1 is a 32-pin QFN version of the LTC3861,
which has a single differential remote output voltage sense
amplifier.
Typical Application
VIN
VCC
1µF
28k
VOUT
10k
3.3nF 10k
10k 280Ω
4.7nF 5.9k 100pF
VCC
FREQ
VINSNS PWM1
FB2
ILIM2
LTC3861
VSNSOUT1
VSNSP1
VSNSN1
VSNSOUT2
VSNSP2
RUN1,2
ILIM1
ISNS1P
ISNS1N
ISNS2N
ISNS2P
VSNSN2
CONFIG
PWM2
FB1 IAVG
COMP1,2 SS1,2 SGND CLKIN
0.1µF
VCC
59k
LTC4449
IN GND
VLOGIC
VCC
BOOST
TG
TS
BG
0.22µF
0.22µF
0.22µF
VCC
100pF
LTC4449
IN GND
VLOGIC
VCC
BOOST
TG
TS
BG
0.22µF
VIN, 7V TO 14V
TG1
SW1
BG1
180µF
0.47µH
2.87k
VIN 2.87k
330µF
×6
TG2
SW2
0.47µH
3861 TA01
BG2
For more information www.linear.com/LTC3861
100µF
×4
VOUT
1.2V
60A
3861fb
1


Linear Technology Electronic Components Datasheet

LTC3861 Datasheet

Multiphase Step-Down Voltage Mode DC/DC Controller

No Preview Available !

LTC3861
Absolute Maximum Ratings
(Note 1)
VCC Voltage................................................... –0.3V to 6V
VINSNS Voltage.......................................... –0.3V to 30V
RUN1, RUN2 Voltage.........................–0.3V to VCC + 0.3V
ISNS1P, ISNS1N,
ISNS2P, ISNS2N............................ –0.3V to (VCC + 0.1V)
All Other Pins.................................–0.3V to (VCC + 0.3V)
Operating Junction Temperature Range
(Notes 2, 3)............................................. –40°C to 125°C
Storage Temperature Range................... –65°C to 150°C
Pin Configuration
TOP VIEW
36 35 34 33 32 31 30 29
FB1 1
28 RUN1
COMP1 2
VSNSP1 3
27 ILIM1
26 SGND
VSNSN1 4
VSNSOUT1 5
VSNSOUT2 6
37
SGND
25 ISNS1P
24 ISNS1N
23 ISNS2N
VSNSN2 7
22 ISNS2P
VSNSP2 8
21 SGND
COMP2 9
FB2 10
20 ILIM2
19 RUN2
11 12 13 14 15 16 17 18
UHE PACKAGE
36-LEAD (5mm × 6mm) PLASTIC QFN
TJMAX = 125°C, θJA = 43°C/W
EXPOSED PAD (PIN 37) IS SGND, MUST BE SOLDERED TO PCB
Order Information
LEAD FREE FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC3861EUHE#PBF
LTC3861EUHE#TRPBF 3861
36-Lead (5mm × 6mm) Plastic QFN
–40°C to 125°C
LTC3861IUHE#PBF
LTC3861IUHE#TRPBF 3861
36-Lead (5mm × 6mm) 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 non-standard 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/
3861fb
2 For more information www.linear.com/LTC3861


Part Number LTC3861
Description Multiphase Step-Down Voltage Mode DC/DC Controller
Maker Linear Technology
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LTC3861 Datasheet PDF





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