(China (Mainland))
Product Summary
The LT1499IS is an adaptive-frequency current mode step-up switching regulator with an internal power switch that is rated up to 700mA. In contrast to pulse skipping switching regulators, the LT1499IS uses a current mode topology that provides lower noise operation and improved efficiency. The applications of the LT1499IS are Portable Instrumentation, Battery Operated Systems, PDA’s, Standby Power.
Parametrics
LT1499IS absolute maximum ratings: (1)Supply Voltage:20V; (2)Switch Voltage (SW):30V; (3)Shutdown Voltage (SHDN):20V; (4)ISENSE Voltage:20V; (5)FB Voltage:5V; (6)LBI Voltage:5V; (7)LBO Voltage:15V; (8)Operating Ambient Temperature Range: Commercial:0℃ to 70℃, Industrial:–40℃ to 85℃; (9)Operating Junction Temperature Range: Commercial:0℃ to 100℃, Industrial:–40℃ to 100℃; (10)Storage Temperature Range:–65℃ to 150℃; (11)Lead Temperature (Soldering, 10 sec):300℃.
Features
LT1499IS features: (1)Low Noise Adaptive-Frequency Current Mode Operation Avoids Low Frequency Noise at Most Load Currents; (2)Can Be Externally Synchronized (LT1500); (3)Micropower Quiescent Current: 200μA; (4)Shutdown Current: 8μA Typ; (5)Internal Loop Compensation; (6)Low-Battery Comparator Active in Shutdown; (7)Minimum Input Voltage: 1.8V Typ; (8)Additional Negative Voltage Feedback Pin (LT1500); (9)Up to 500kHz Switching Frequency; (10)Uses Low Profile, Low Cost Surface Mount Inductors.
Diagrams
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LT1499IS#TR |
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LT1499IS#TRPBF |
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