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LTC3811

Features: 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 Amplifi er Inductor DCR or Sense Resi...

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SeekIC No. : 004402364 Detail

LTC3811: Features: 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 Ran...

LTC3811 Data Sheet

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Part Number:
LTC3811
Supply Ability:
5000

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  • 1~5000
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  • Negotiable
  • Processing time
  • 15 Days
Total Cost: $ 0.00

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Product Details

Description



Features:

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 Amplifi er
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


Application

Network Servers
High Current ASIC Supplies
Low Voltage Power Distribution


Pinout

Connection Diagram


Specifications

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+,
SENSE2 Voltages ............................  0.3V to INTVCC
DRVCC LDO RMS Output Current .........................100mA
OperatingTemperature Range (Note 2)..... 40to 85
Junction Temperature (Note 3) ............................. 125
Storage Temperature Range ................. 65 to 125
Lead Temperature (Soldering, 10 sec)
    SSOP Package .................................................. 300


Description

The LTC®3811 is a dual, PolyPhase® synchronous stepdown switching regulator controller optimized for output voltages up to 3.3V. The LTC3811 includes high bandwidth error amplifi ers as well as a high speed differential remote sense amplifi er. 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 20A.




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