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LT1941 Datasheet(PDF) 1 Page - Linear Technology |
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LT1941 Datasheet(HTML) 1 Page - Linear Technology |
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1 / 24 page  1 LT1941 1941f Triple Monolithic Switching Regulator s Wide Input Range: 3.5V to 25V s Three Switching Regulators with Internal Power Switches: 3A Step-Down, 2A Step-Down, 1.5A Inverting/Boost s Antiphase Switching Reduces Ripple s Independent Shutdown/Soft-Start Pins s Independent Power Good Indicators Ease Supply Sequencing s Input Voltage Power Good Indicators Monitor Input Supply s Uses Small Inductors and Ceramic Capacitors s Constant 1.1MHz Switching Frequency s Thermally Enhanced 28-Lead TSSOP Package , LTC and LT are registered trademarks of Linear Technology Corporation. s Cable Modems s DSL Modems s Distributed Power Regulation s Wall Transformer Regulation s Disk Drives s DSP Power The LT ®1941 is a triple current mode DC/DC converter with internal power switches. Two of the regulators are step-down converters with 3A and 2A power switches. The third regulator can be configured as a boost, inverter or SEPIC converter and has a 1.5A power switch. All three converters are synchronized to a 1.1MHz oscillator. The two step-down converters run with opposite phases, reducing input ripple current. The output voltages are set with external resistor dividers and each regulator has independent shutdown and soft-start circuits. Each regu- lator generates a power good signal when its output is in regulation, easing power supply sequencing and interfac- ing with microcontrollers and DSPs. The high switching frequency offers several advantages by permitting the use of small inductors and ceramic capacitors. Small inductors and capacitors lead to a very small triple output solution. The constant switching fre- quency, combined with low impedance ceramic capaci- tors, result in low, predictable output ripple. With its wide input voltage range of 3.5V to 25V, the LT1941 regulates a broad array of power sources from 4-cell batteries and 5V logic rails to unregulated wall transformers, lead acid batteries and distributed-power supplies. Figure 1. Triple Output Power Supply: 3.3V, 1.8V, –12V RUN/SS 2V/DIV VOUT1 2V/DIV VOUT2 5V/DIV VOUT3 10V/DIV IVIN(AVE) 1A/DIV PGOOD2 5V/DIV 1941 F01b Start-Up Waveforms with Sequencing VOUT2 VOUT1 LT1941 GND 0.22 µF 22 µF 1000pF 1.5nF 1.5nF 3300pF 13.7k 133k 2.49k 10k VIN 4.7V TO 14V 5GOOD 12GOOD VOUT1 1.8V 2.4A VOUT3* –12V 350mA 3.3 µH 3 µH 22 µH 22 µH 10.7k 13.7k 7.32k 3.3k 1.5k 1941 F01 130k 100k 100k 100k 100k PGOOD1 PGOOD2 PGOOD3 VOUT2 3.3V 1.4A 0.22 µF 33 µF 1 µF 10 µF *240mA AT VIN = 5V, 550mA AT VIN = 12V 10 µF 22nF PGOOD1 PGOOD2 PGOOD3 BOOST2 SW2 FB2 VC2 SW1 FB1 VC1 RUNSS2 BIAS1 BIAS2 VC3 RUNSS3 RUNSS1 SW3 NFB FB3 5GOOD 12GOOD BOOST1 1.5nF FEATURES DESCRIPTIO APPLICATIO S TYPICAL APPLICATIO |
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