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Linear Technology Electronic Components Datasheet

LTC3861-1 Datasheet

Multiphase Step-Down Voltage Mode DC/DC Controller

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LTC3861-1
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 Differential Remote Output Voltage Sense Amplifier
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 32-Pin 5mm × 5mm QFN Package
Applications
n High Current Distributed Power Systems
n DSP, FPGA and ASIC Supplies
n Datacom and Telecom Systems
n Industrial Power Supplies
The LTC®3861-1 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 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.
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
LTC3861-1 controllers can operate in parallel for 1-, 2-, 3-,
4-, 6- or 12-phase operation.
The LTC3861-1 is pin-to-pin compatible with the LTC3860.
It is available in a 32-pin 5mm × 5mm QFN package. The
LTC3861is a 36-pin QFN version of the LTC3861-1, which
has dual differential output voltage sense amplifiers.
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
Typical Application
VCC
1µF
28.7k
VOUT
1nF
20k 221Ω
20k 1nF 13k 220pF
VIN, 7V TO 14V
VCC
FREQ
VINSNS PWM1
FB2
ILIM2
LTC3861-1
VSNSOUT
RUN1,2
ILIM1
ISNS1P
VSNSP
ISNS1N
VSNSN
ISNS2N
CONFIG
ISNS2P
PWM2
FB1 IAVG
COMP1,2 SS1,2 SGND CLKIN
0.1µF
VCC
59k
LTC4449
IN
VLOGIC
VCC
BOOST
GND
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
180µF
0.47µH
2.87k
VIN 2.87k
330µF
×6
100µF
×4
VOUT
1.2V
60A
0.47µH
38611 TA01
For more information www.linear.com/LTC3861-1
38611fb
1


Linear Technology Electronic Components Datasheet

LTC3861-1 Datasheet

Multiphase Step-Down Voltage Mode DC/DC Controller

No Preview Available !

LTC3861-1
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
32 31 30 29 28 27 26 25
VCC 1
FB1 2
COMP1 3
24 RUN1
23 ILIM1
22 ISNS1P
VSNSOUT 4
VSNSN 5
33
SGND
21 ISNS1N
20 ISNS2N
VSNSP 6
19 ISNS2P
COMP2 7
FB2 8
18 ILIM2
17 RUN2
9 10 11 12 13 14 15 16
UH PACKAGE
32-LEAD (5mm × 5mm) PLASTIC QFN
TJMAX = 125°C, θJA = 34°C/W
EXPOSED PAD (PIN 33) IS SGND, MUST BE SOLDERED TO PCB
Order Information
LEAD FREE FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC3861EUH-1#PBF
LTC3861EUH-1#TRPBF 38611
32-Lead (5mm × 5mm) Plastic QFN
–40°C to 125°C
LTC3861IUH-1#PBF
LTC3861IUH-1#TRPBF 38611
32-Lead (5mm × 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 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/
38611fb
2 For more information www.linear.com/LTC3861-1


Part Number LTC3861-1
Description Multiphase Step-Down Voltage Mode DC/DC Controller
Maker Linear Technology
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