参数资料
型号: LTC3811EG#TRPBF
厂商: Linear Technology
文件页数: 1/48页
文件大小: 0K
描述: IC REG CTRLR BUCK PWM CM 36-SSOP
标准包装: 2,000
系列: PolyPhase®
PWM 型: 电流模式
输出数: 2
频率 - 最大: 850kHz
占空比: 90%
电源电压: 4.5 V ~ 30 V
降压:
升压:
回扫:
反相:
倍增器:
除法器:
Cuk:
隔离:
工作温度: -40°C ~ 85°C
封装/外壳: 36-SSOP(0.209",5.30mm 宽)
包装: 带卷 (TR)
LTC3811
High Speed Dual,
Multiphase Step-Down DC/DC
FEATURES
DESCRIPTION
Controller
Fixed Frequency, Peak Current Mode Control
±0.5% Output Accuracy Over Temperature
Optimized for Low V OUT Applications (Up to 3.3V)
Dual or Single Output, Multiphase Operation
Wide V IN Range: 4.5V to 30V Operation
High Speed Differential Remote Sense Ampli?er
Inductor DCR or Sense Resistor Capable
Adjustable Peak Current Sense Voltage:
24mV to 85mV
Very Low Duty Cycle Operation: t ON(MIN) = 65ns (Typ)
Powerful Internal Gate Drivers
Output Voltage Soft-Start, Tracking and Sequencing
Programmable Load Line for Reduced C OUT
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
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 ampli?ers as well as a high speed differential remote
sense ampli?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,
APPLICATIONS
and soft-start is programmed with an external capacitor.
Shutdown reduces supply current to 20μA.
Network Servers
High Current ASIC Supplies
Low Voltage Power Distribution
, 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
Dual Output, 2-Phase Tracking Core and I/O Supply
V IN
4.5V TO 14V
Load Step
TG1
V IN
INTV CC
DRV CC
TG2
BOOST1
SW1
BG1
RUN1
RUN2
LTC3811
BOOST2
SW2
BG2
PGND
V OUT
100mV/DIV
DIFF/IN +
V OUT1
2V
15A
SENSE1 + SENSE2 +
SENSE1 – SENSE2 –
RNG1
DIFF/IN –
RNG2
DIFF/OUT
FB1 FB2
COMP1 COMP2
SS/TRACK1 SGND SS/TRACK2
V OUT2
1.5V
15A
I L
5A/DIV
V IN = 12V
V OUT = 2V
I OUT = 0A to 12.5A
20μs/DIV
3811 TA01b
3811 TA01a
3811f
1
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