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LT1533C Datasheet(PDF) 1 Page - Linear Technology |
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LT1533C Datasheet(HTML) 1 Page - Linear Technology |
1 / 20 page 1 LT1533 Ultralow Noise 1A Switching Regulator FEATURES DESCRIPTION The LT ®1533 is a new class of switching regulator designed to reduce conducted and radiated electromagnetic interfer- ence (EMI). Ultralow noise and EMI are achieved by providing user control of the output switch slew rates. Voltage and current slew rates can be independently programmed to optimize switcher harmonic content versus efficiency. The LT1533 can reduce high frequency harmonic power by as much as 40dB with only minor losses in efficiency. The LT1533 utilizes a dual output switch current mode architecture optimized for low noise topologies. The IC includes two 1A power switches along with all necessary oscillator, control and protection circuitry. Unique error amp circuitry can regulate both positive and negative voltages. The internal oscillator may be synchronized to an external clock for more accurate placement of switching harmonics. Protection features include cycle by cycle current limit pro- tection, undervoltage lockout and thermal shutdown. Low minimum supply voltage and low supply current during shutdown make the LT1533 well suited for portable applica- tions. The part may also be forced into a 50% duty cycle mode for unregulated applications. The LT1533 is available in the 16-pin narrow SO package. s Greatly Reduced Conducted and Radiated EMI (<100 µVP-P in Typical Application) s Low Switching Harmonic Content s Independent Control of Switch Voltage and Current Slew Rates s Two 1A Current Limited Power Switches s Regulates Positive and Negative Voltages s 20kHz to 250kHz Oscillator Frequency s Easily Synchronized to External Clock s Wide Input Voltage Range: 2.7V to 23V s Low Shutdown Current: 12 µA Typical s Easier Layout than with Conventional Switchers s Outputs Can Be Forced to 50% Duty Cycle for Unregulated Applications s Precision Instrumentation Systems s Isolated Supplies for Industrial Automation s Medical Instruments s Wireless Communications s Single Board Data Acquisition Systems APPLICATIONS TYPICAL APPLICATION , LTC and LT are registered trademarks of Linear Technology Corporation. SHDN DUTY SYNC COL A COL B PGND RVSL RCSL FB NFB LT1533 GND VIN 5V 14 2 15 16 13 12 7 11 3 4 5 6 10 820pF 16.9k 0.015 µF 1000pF 15k Note 1 33 µF 15k 15k + T1 1N4148 B A L1 300 µH L2 33 µH 1N4148 2.49k 1% 8 9 21.5k, 1% C1 47 µF 16V + C2 33 µF 20V C1: SANYO OS-CON C2: AVX TPS TANTALUM L1: COILTRONICS CTX300-2 L2: COILCRAFT DT1608C-333 T1: COILTRONICS CTX02-13834 NOTE 1: 25nH TRACE INDUCTANCE OR COILCRAFT B07T 12V 150mA 1533 TA01 + CT RT VC Low Noise 5V to 12V Forward Push-Pull DC/DC Converter B 2mV/DIV A 100 µV/DIV 2 µs/DIV 1533 TA02 12V Output Noise (BW = 100MHz) <100 µVP-P |
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