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LT1777CS PDF预览

LT1777CS

更新时间: 2024-02-14 00:57:32
品牌 Logo 应用领域
凌特 - Linear 稳压器开关
页数 文件大小 规格书
24页 272K
描述
Low Noise Step-Down Switching Regulator

LT1777CS 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:SOP,
针数:16Reach Compliance Code:compliant
风险等级:5.15Is Samacsys:N
模拟集成电路 - 其他类型:SWITCHING REGULATOR控制模式:CURRENT-MODE
控制技术:PULSE WIDTH MODULATION最小输入电压:7.4 V
标称输入电压:24 VJESD-30 代码:R-PDSO-G16
JESD-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:16最大输出电流:1 A
封装主体材料:PLASTIC/EPOXY封装代码:SOP
封装形状:RECTANGULAR封装形式:SMALL OUTLINE
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:BUCK最大切换频率:115 kHz
端子面层:Matte Tin (Sn)端子形式:GULL WING
端子节距:1.27 mm端子位置:DUAL
处于峰值回流温度下的最长时间:NOT SPECIFIED宽度:3.9 mm
Base Number Matches:1

LT1777CS 数据手册

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LT1777  
ELECTRICAL CHARACTERISTICS  
The denotes specifications which apply over the full operating temperature range, otherwise specifications are at TJ = 25°C.  
IN = 24V, VSW Open, VCC = 5V, VC = 1.4V unless otherwise noted.  
V
SYMBOL PARAMETER CONDITIONS  
Output Switch  
MIN  
TYP  
MAX  
UNITS  
R
Output Switch On Voltage  
Switch Current Limit  
I
= 0.5A  
SW  
1.0  
0.70  
1.3  
1.5  
1.0  
V
A
ON  
I
(Note 3)  
0.55  
0.6  
LIM  
Output dl/dt Sense Voltage  
V
V
2.0  
Current Amplifier  
Control Pin Threshold  
Duty Cycle = 0%  
0.9  
1.1  
2
1.25  
V
Control Voltage to Switch Transconductance  
A/V  
Timing  
f
Switching Frequency  
90  
85  
100  
90  
110  
115  
kHz  
kHz  
Maximum Switch Duty Cycle  
85  
%
Sync Function  
Minimum Sync Amplitude  
1.5  
40  
2.2  
V
kHz  
kΩ  
Synchronization Range  
SYNC Pin Input R  
130  
250  
SHDN Pin Function  
V
Shutdown Mode Threshold  
0.5  
V
V
SHDN  
0.2  
0.8  
Upper Lockout Threshold  
Lower Lockout Threshold  
Shutdown Pin Current  
Switching Action On  
Switching Action Off  
1.260  
1.245  
V
V
I
V
V
= 0V  
= 1.25V  
12  
2.5  
20  
10  
µA  
µA  
SHDN  
SHDN  
SHDN  
Note 1: Absolute Maximum Ratings are those values beyond which the life  
of a device may be impaired.  
Note 4: During normal operation the V pin may fly as much as 3V  
below ground. However, the LT1777 may not be used in an inverting  
DC/DC configuration.  
SW  
Note 2: Control circuitry powered from V  
.
CC  
Note 3: Switch current limit is DC trimmed and tested in production.  
Inductor dI/dt rate will cause a somewhat higher current limit in actual  
application.  
3

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