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LTC3830ES Datasheet(PDF) 1 Page - Linear Technology |
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LTC3830ES Datasheet(HTML) 1 Page - Linear Technology |
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1 / 24 page  1 LTC3830/LTC3830-1 sn3830 3830fs High Power Step-Down Synchronous DC/DC Controllers for Low Voltage Operation s High Power Switching Regulator Controller for 3.3V-5V to 1.xV-3.xV Step-Down Applications s No Current Sense Resistor Required s Low Input Supply Voltage Range: 3V to 8V s Maximum Duty Cycle > 91% Over Temperature s All N-Channel External MOSFETs s Excellent Output Regulation: ±1% Over Line, Load and Temperature Variations s High Efficiency: Over 95% Possible s Adjustable or Fixed 3.3V Output (16-Pin Version) s Programmable Fixed Frequency Operation: 100kHz to 500kHz s External Clock Synchronization s Soft-Start (Some Versions) s Low Shutdown Current: <10 µA s Overtemperature Protection s Available in S8, S16 and SSOP-16 Packages s CPU Power Supplies s Multiple Logic Supply Generator s Distributed Power Applications s High Efficiency Power Conversion The LTC ®3830/LTC3830-1 are high power, high effi- ciency switching regulator controllers optimized for 3.3V-5V to 1.xV-3.xV step-down applications. A preci- sion internal reference and feedback system provide ±1% output regulation over temperature, load current and line voltage variations. The LTC3830/LTC3830-1 use a synchronous switching architecture with N-channel MOSFETs. Additionally, the chip senses output current through the drain-source resistance of the upper N-channel FET, providing an adjustable current limit without a current sense resistor. The LTC3830/LTC3830-1 operate with an input supply voltage as low as 3V and with a maximum duty cycle of >91% over temperature. They include a fixed frequency PWM oscillator for low output ripple operation. The 200kHz free-running clock frequency can be externally adjusted or synchronizedwithanexternalsignalfrom100kHzto500kHz. In shutdown mode, the LTC3830 supply current drops to <10 µA. The LTC3830-1 differs from the LTC3830 S8 ver- sion by replacing shutdown with a soft-start function. For a similar, pin compatible DC/DC converter with an output voltage as low as 0.6V, please refer to the LTC3832. , LTC and LT are registered trademarks of Linear Technology Corporation. Figure 1. High Efficiency 3V-8V to 1.8V Power Converter + + 0.01 µF 15k SS COMP GND FB PVCC2 G1 PVCC1 G2 LTC3830-1 12V 3.3nF 0.1 µF 4.7 µF M1 Si7806DN 4.7 µF B320A 220 µF 10V 1.8V 9A L 3.2 µH M2 Si7806DN L: SUMIDA CDEP105-3R2MC-88 COUT: PANASONIC EEFUEOD271R COUT 270 µF 2V 3830 F01 5.1 Ω VIN 3V TO 8V 12.7k 1% 5.36k 1% LOAD CURRENT (A) 40 60 80 100 50 70 90 24 6 8 3830 TA02 10 1 03 5 7 9 VIN = 3.3V VOUT = 1.8V Efficiency DESCRIPTIO FEATURES APPLICATIO S TYPICAL APPLICATIO |
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