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LTM4630-1B PDF预览

LTM4630-1B

更新时间： 2024-09-13 01:10:51
品牌 Logo 应用领域
凌特 - Linear /
页数 文件大小 规格书
38页 421K
描述
Dual, Multiphase Current Mode Synchronous Controller for Sub-Milliohm DCR Sensing

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LTM4630-1B 数据手册

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LTC3774  
Dual, Multiphase Current  
Mode Synchronous Controller  
for Sub-Milliohm DCR Sensing  
DESCRIPTION  
FEATURES  
The LTC®3774 is a dual PolyPhase® current mode syn-  
chronous step-down switching regulator controller that  
drives power blocks, DRMOS or external gate drivers and  
power MOSFETs. It offers an LTC-proprietary technique  
that enhances the signal-to-noise ratio of the current  
sense signal, allowing the use of inductors with very low  
DC winding resistances as the current sense element for  
maximum efficiency and reduced jitter.  
n
Sub-Milliohm DCR Current Sensing  
n
Operates with Power Blocks, DRMOS or External  
Gate Drivers and MOSFETs  
n
Supports Phase Shedding and N+1 Phase  
Redundancy  
n
Programmable DCR Temperature Compensation  
n
0.ꢀ5ꢁ Maximum Total DC Output Error Over  
Temperature  
n
Dual Differential Remote Output Voltage Sense  
The maximum current sense voltage is programmable  
from 10mV to 30mV. High speed, low offset remote sense  
differentialamplifiersandaprecise0.6Vreferenceprovide  
accurateoutputvoltagesbetween0.6Vand3.5Vfromawide  
4.5V to 38V input supply range. Soft recovery from output  
shorts or overcurrent minimizes output overshoot. Burst  
Mode® operation, continuous and pulse-skipping modes  
are supported. The constant operating frequency can be  
synchronized to an external clock or linearly programmed  
from200kHzto1.2MHz.UptosixLTC3774controllerscan  
be paralleled for 1-, 2-, 3-, 4-, 6-, 8- or 12-phase operation.  
Amplifiers  
n
Phase-Lockable Fixed Frequency Range: 200kHz to  
1.2MHz  
n
V Range: 4.5V to 38V  
IN  
OUT  
n
n
n
n
n
V
Range: 0.6V to 3.5V  
Supports Smooth Start-Up into Pre-Biased Outputs  
Programmable Soft-Start or V Tracking  
Hiccup Mode/Soft Recovery from Output Overcurrent  
OUT  
36-Lead (5mm × 6mm) QFN Package  
APPLICATIONS  
The LTC3774 is available in a 36-lead (5mm × 6mm) QFN  
package.  
n
Computer Systems  
n
Telecom and Datacom Systems  
L, LT, LTC, LTM, Linear Technology, the Linear logo, PolyPhase and Burst Mode are registered  
n
Industrial Equipment  
DC Power Distribution Systems  
trademarks and No R  
and Hot Swap are trademarks of Analog Devices, Inc. All other  
SENSE  
trademarks are the property of their respective owners. Protected by U.S. Patents, including  
5481178, 5705919, 5929620, 6177787, 6580258, 6498466, 6611131, patent pending.  
n
TYPICAL APPLICATION  
High Efficiency Dual Phase 1.5V/60A Step-Down Converter  
V
IN  
4.5V TO 20V  
22µF  
50V  
V
IN  
RUN1, 2  
ILIM1, 2  
HIZB1  
PHSMD  
CLKOUT  
PGOOD1,2  
MODE/PLLIN  
1/4 INTV  
CC  
0.33µH  
(0.32mΩ DCR)  
0.33µH  
(0.32mΩ DCR)  
f
HIZB2  
IN  
500kHz  
LTC3774  
DRMOS  
DRMOS  
PWM1  
PWM2  
PWMEN1  
PWMEN2  
GND  
–
–
V
V
OSNS2  
OSNS1  
+
+
+
–
+
SNSA1  
SNS1  
SNSD1  
SNSA2  
SNS2  
SNSD2  
–
15k  
FREQ  
V
1.5V  
60A  
OUT  
+
+
V
V
OSNS1  
OSNS2  
I
I
TH1  
TH2  
TK/SS1  
TK/SS2  
INTV  
2200pF  
15k  
CC  
+
10k  
+
300µF  
4V  
330µF  
4V  
37.5k  
0.1µF  
4.7µF  
3774 TA01a  
3774fc  
1
For more information www.linear.com/LTC3774  
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