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LTC3720EGN#TRPBF PDF预览

LTC3720EGN#TRPBF

更新时间: 2024-01-28 01:17:25
品牌 Logo 应用领域
凌特 - Linear 控制器
页数 文件大小 规格书
24页 294K
描述
LTC3720 - Single Phase VRM8.5 Current Mode Step-Down Controller; Package: SSOP; Pins: 28; Temperature Range: -40°C to 85°C

LTC3720EGN#TRPBF 技术参数

是否无铅: 含铅是否Rohs认证: 符合
生命周期:Active包装说明:SSOP,
针数:28Reach Compliance Code:compliant
风险等级:5.34模拟集成电路 - 其他类型:SWITCHING CONTROLLER
控制模式:CURRENT-MODE最大输入电压:36 V
最小输入电压:4 V标称输入电压:15 V
JESD-30 代码:R-PDSO-G28JESD-609代码:e3
长度:9.9 mm湿度敏感等级:1
功能数量:1端子数量:28
最高工作温度:70 °C最低工作温度:
最大输出电流:2 A封装主体材料:PLASTIC/EPOXY
封装代码:SSOP封装形状:RECTANGULAR
封装形式:SMALL OUTLINE, SHRINK PITCH峰值回流温度(摄氏度):250
认证状态:Not Qualified座面最大高度:1.75 mm
表面贴装:YES切换器配置:PUSH-PULL
温度等级:COMMERCIAL端子面层:Matte Tin (Sn)
端子形式:GULL WING端子节距:0.635 mm
端子位置:DUAL处于峰值回流温度下的最长时间:NOT SPECIFIED
宽度:3.9116 mm

LTC3720EGN#TRPBF 数据手册

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LTC3720  
Single Phase VRM8.5  
Current Mode Step-Down Controller  
U
FEATURES  
DESCRIPTIO  
5-Bit Programmable Output Voltage:  
The LTC®3720 is a synchronous step-down switching  
regulator controller for CPU power. An output voltage  
between 1.05V and 1.825V is selected by a 5-bit code  
(Intel VRM8.5 VID specification). The controller uses a  
valley current control architecture to deliver very low duty  
cycles without requiring a sense resistor. Operating fre-  
quency is selected by an external resistor and is compen-  
1.05V to 1.825V (VRM8.5)  
No Sense Resistor Required  
2% to 87% Duty Cycle at 200kHz  
tON(MIN) 100ns  
Supports Active Voltage Positioning  
True Current Mode Control  
Stable with Ceramic COUT  
sated for variations in VIN and VOUT.  
Dual N-Channel MOSFET Synchronous Drive  
Power Good Output Voltage Monitor  
Wide VIN Range: 4V to 36V  
±1% 0.8V Reference  
Adjustable Current Limit  
Adjustable Switching Frequency  
Forced Continuous Control Pin  
Programmable Soft-Start  
Output Overvoltage Protection  
Optional Short-Circuit Shutdown Timer  
Micropower Shutdown: IQ < 30µA  
Available in 28-LUead Narrow SSOP Package  
Discontinuous mode operation provides high efficiency  
operation at light loads. A forced continuous control pin  
reduces noise and RF interference and can assist second-  
ary winding regulation by disabling discontinuous mode  
operation when the main output is lightly loaded.  
Fault protection is provided by internal foldback current  
limiting, an output overvoltage comparator and optional  
short-circuitshutdowntimer.Soft-startcapabilityforsup-  
ply sequencing is accomplished using an external timing  
capacitor. The regulator current limit level is also user  
programmable. Wide supply range allows operation from  
4V to 36V at the input.  
, LTC and LT are registered trademarks of Linear Technology Corporation.  
No RSENSE is a trademark of Linear Technology Corporation.  
Pentium is a registered trademark of Intel Corporation.  
APPLICATIO S  
Power Supplies for Pentium® Processors  
Notebook Computers and Servers  
U
TYPICAL APPLICATIO  
LTC3720  
PGOOD  
330k  
Efficiency vs Output Current  
I
ON  
100  
V
IN  
V
= 1.45V  
OUT  
L1 = 1µH  
0.1µF  
V
IN  
5V TO 24V  
95  
90  
85  
80  
75  
70  
65  
60  
55  
10µF  
×5  
IRF7811W  
RUN/SS  
TG  
×2  
L1  
470pF  
1µH  
V
= 5V  
V
OUT  
I
SW  
IN  
V
TH  
1.05V TO 1.825V  
20A  
20k  
0.33µF  
C
OUT  
SGND BOOST  
+
= 15V  
IN  
270µF  
2V  
V
CMDSH-3  
CC  
INTV  
CC  
×4  
UPS840  
+
+
VID4  
VID3  
VID2  
VID1  
VID0  
SENSE  
BG  
4.7µF  
IRF7811W  
×3  
C
OUT  
: CORNELL DUBILIER  
ESRE271M02B  
L1: SUMIDA CEP125-IROMC  
5-BIT VID  
PGND  
SENSE¯  
3720 F01a  
V
OSENSE  
0.01  
1
10  
100  
0.1  
OUTPUT CURRENT (A)  
3720 F01b  
Figure 1. High Efficiency Step-Down Converter  
3720f  
1

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