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LT1614 Datasheet(PDF) 1 Page - Linear Technology |
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LT1614 Datasheet(HTML) 1 Page - Linear Technology |
1 / 16 page 1 LT1614 Inverting 600kHz Switching Regulator The LT ®1614 is a fixed frequency, inverting mode switch- ing reglator that operates from an input voltage as low as 1V. Utilizing a low noise topology, the LT1614 can gener- ate a negative output down to – 24V from a 1V to 5V input. Fixed frequency switching ensures a clean output free from low frequency noise. The device contains a low- battery detector with a 200mV reference and shuts down to less than 10 µA.NoloadquiescentcurrentoftheLT1614 is 1mA and the internal NPN power switch handles a 500mA current with a voltage drop of just 295mV. High frequency switching enables the use of small induc- tors and capacitors. Ceramic capacitors can be used in many applications, eliminating the need for bulky tanta- lum types. The LT1614 is available in 8-lead MSOP or SO packages. s Better Regulation Than a Charge Pump s 0.1 Ω Effective Output Impedance s – 5V at 200mA from a 5V Input s 600kHz Fixed Frequency Operation s Operates with VIN as Low as 1V s 1mA Quiescent Current s Low Shutdown Current: 10 µA s Low-Battery Detector s Low VCESAT Switch: 295mV at 500mA , LTC and LT are registered trademarks of Linear Technology Corporation. s MR Head Bias s LCD Bias s GaAs FET Bias s Positive-to-Negative Conversion 5V to – 5V Converter Efficiency Figure 1. 5V to – 5V/200mA Converter VIN SW LT1614 L1 22 µH VIN 5V D1 NFB SHDN 69.8k 24.9k 100k 1nF VOUT –5V 200mA C1, C2: AVX TAJB336M010 C3: TAIYO YUDEN EMK316BJ105MF D1: MBR0520 L1, L2: MURATA LQH3C220 1614 TA01 C1 33 µF C2 33 µF VC GND L2 22 µH C3 1 µF + LOAD CURRENT (mA) 310 30 60 70 80 90 100 300 1614 TA02 50 40 APPLICATIO S FEATURES TYPICAL APPLICATIO DESCRIPTIO |
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