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Linear Technology Electronic Components Datasheet

LTC3811EUHF Datasheet

Multiphase Step-Down DC/DC Controller

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LTC3811
FEATURES
High Speed Dual,
Multiphase Step-Down DC/DC
DESCRIPTION
Controller
Fixed Frequency, Peak Current Mode Control
±0.5% Output Accuracy Over Temperature
Optimized for Low VOUT Applications (Up to 3.3V)
Dual or Single Output, Multiphase Operation
Wide VIN Range: 4.5V to 30V Operation
High Speed Differential Remote Sense Amplifier
Inductor DCR or Sense Resistor Capable
Adjustable Peak Current Sense Voltage:
24mV to 85mV
Very Low Duty Cycle Operation: tON(MIN) = 65ns (Typ)
Powerful Internal Gate Drivers
Output Voltage Soft-Start, Tracking and Sequencing
Programmable Load Line for Reduced COUT
Clock Input and Output for Up to 12-Phase Operation
Fixed Frequency Operation from 250kHz to 750kHz
PLL Synchronization from 150kHz Up to 900kHz
Selectable CCM or DCM Operation
Available in 5mm × 7mm QFN and G36 Packages
APPLICATIONS
Network Servers
High Current ASIC Supplies
Low Voltage Power Distribution
The LTC®3811 is a dual, PolyPhase® synchronous step-
down switching regulator controller optimized for output
voltages up to 3.3V. The LTC3811 includes high bandwidth
error amplifiers as well as a high speed differential remote
sense amplifier. The sense voltage range is programmable
from 24mV to 85mV, allowing the use of either the inductor
DCR or a discrete sense resistor. Multiphase operation is
made possible using the MODE/SYNC input, the CLKOUT
output and the PHASEMODE control pin, allowing 1-, 2-,
3-, 4-, 6- or 12-phase operation.
Large internal gate drivers minimize switching losses and
allow the use of multiple power MOSFETs connected in
parallel for high current applications.
The operating frequency of the LTC3811 can be programmed
from 250kHz to 750kHz and can also be synchronized to
an external clock using the internal PLL.
Tracking and sequencing are possible with the LTC3811,
and soft-start is programmed with an external capacitor.
Shutdown reduces supply current to 20μA.
, LT, LTC, LTM and PolyPhase are registered trademarks of Linear Technology
Corporation. All other trademarks are the property of their respective owners.
Protected by U.S. Patents, including 5481178, 6304066, 5929620, 6177787, 6144194,
6580258, 5705919.
TYPICAL APPLICATION
VOUT1
2V
15A
Dual Output, 2-Phase Tracking Core and I/O Supply
VIN
4.5V TO 14V
VIN
TG1
INTVCC DRVCC
TG2
BOOST1
SW1
BG1
BOOST2
SW2
BG2
RUN1
PGND
RUN2
SENSE1+
SENSE1
RNG1
RNG2
FB1
LTC3811
SENSE2+
SENSE2
DIFF/IN+
DIFF/IN
DIFF/OUT
FB2
COMP1
COMP2
SS/TRACK1 SGND SS/TRACK2
VOUT2
1.5V
15A
3811 TA01a
VOUT
100mV/DIV
Load Step
IL
5A/DIV
VIN = 12V
VOUT = 2V
IOUT = 0A to 12.5A
20μs/DIV
3811 TA01b
3811f
1


Linear Technology Electronic Components Datasheet

LTC3811EUHF Datasheet

Multiphase Step-Down DC/DC Controller

No Preview Available !

LTC3811
ABSOLUTE MAXIMUM RATINGS (Note 1)
Input Supply Voltage (VIN) ......................... –0.3V to 30V
Topside Driver Voltages
(BOOST1, BOOST2) ............................... –0.3V to 37V
Switch Voltage (SW1, SW2) ......................... –5V to 30V
BOOST1 – SW1, BOOST2 – SW2................. –0.3V to 7V
DRVCC, INTVCC, EXTVCC, RUN1, RUN2, DIFF/IN+,
DIFF/IN, PHASEMODE, PGOOD1, PGOOD2,
MODE/SYNC Voltages.................................. –0.3V to 7V
FB1, FB2, RNG1, RNG2, SS/TRACK1, SS/TRACK2,
PLL/LPF, SENSE1+, SENSE1, SENSE2+,
SENSE2Voltages................................. –0.3V to INTVCC
DRVCC LDO RMS Output Current.........................100mA
OperatingTemperature Range (Note 2)..... –40°C to 85°C
Junction Temperature (Note 3) ............................. 125°C
Storage Temperature Range................... –65°C to 125°C
Lead Temperature (Soldering, 10 sec)
SSOP Package .................................................. 300°C
PIN CONFIGURATION
TOP VIEW
SENSE1+ 1
SENSE1– 2
SS/TRACK1 3
COMP1 4
FB1 5
SGND 6
INTVCC 7
FB2 8
COMP2 9
SS/TRACK2 10
SENSE211
SENSE2+ 12
38 37 36 35 34 33 32
39
13 14 15 16 17 18 19
31 BOOST1
30 TG1
29 SW1
28 BG1
27 EXTVCC
26 PGND
25 DRVCC
24 VIN
23 BG2
22 SW2
21 TG2
20 BOOST2
UHF PACKAGE
38-LEAD (5mm × 7mm) PLASTIC QFN
TJMAX = 125°C, θJA = 34°C/W
EXPOSED PAD (PIN 39) IS PGND, MUST BE SOLDERED TO PCB
PGOOD1 1
RUN1 2
RUN2 3
SENSE1+ 4
SENSE15
SS/TRACK1 6
COMP1 7
FB1 8
SGND 9
INTVCC 10
FB2 11
COMP2 12
SS/TRACK2 13
SENSE214
SENSE2+ 15
DIFF/OUT 16
DIFF/IN17
DIFF/IN+ 18
TOP VIEW
36 PGOOD2
35 PLL/LPF
34 MODE/SYNC
33 BOOST1
32 TG1
31 SW1
30 BG1
29 EXTVCC
28 PGND
27 DRVCC
26 VIN
25 BG2
24 SW2
23 TG2
22 BOOST2
21 CLKOUT
20 RNG2
19 RNG1
G PACKAGE
36-LEAD PLASTIC SSOP WIDE
TJMAX = 125°C, θJA = 100°C/W
ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING
PACKAGE DESCRIPTION
LTC3811EUHF#PBF
LTC3811EUHF#TRPBF 3811
38-Lead (5mm × 7mm) Plastic QFN
LTC3811EG#PBF
LTC3811EG#TRPBF
LTC3811EG
36-Lead Plastic SSOP Wide
Consult LTC Marketing for parts specified with wider operating temperature ranges.
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/
TEMPERATURE RANGE
–40°C to 85°C
–40°C to 85°C
3811f
2


Part Number LTC3811EUHF
Description Multiphase Step-Down DC/DC Controller
Maker Linear Technology
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