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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  LT1941 1 1941fb TYPICAL APPLICATION DESCRIPTION Triple Monolithic Switching Regulator 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 phase, reducing input ripple current. The output voltages are set with external resistor dividers and each regulator has independent shutdown and soft-start circuits. Each regulator generates a power good signal when its output is in regulation, easing power supply sequencing and interfacing with microcontrollers and DSPs. The high switching frequency offers several advantages by permitting the use of small inductors and ceramic capacitors, leading to a very small triple output solution. The constant switching frequency, combined with low impedance ceramic capacitors, 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. L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. FEATURES APPLICATIONS n Wide Input Range: 3.5V to 25V n Three Switching Regulators with Internal Power Switches: 3A Step-Down, 2A Step-Down, 1.5A Inverting/Boost n Antiphase Switching Reduces Ripple n Independent Shutdown/Soft-Start Pins n Independent Power Good Indicators Ease Supply Sequencing n Input Voltage Power Good Indicators Monitor Input Supply n Uses Small Inductors and Ceramic Capacitors n Constant 1.1MHz Switching Frequency n Thermally Enhanced 28-Lead TSSOP Package n Cable Modems n DSL Modems n Distributed Power Regulation n Wall Transformer Regulation n Disk Drives n DSP Power Figure 1. Triple Output Power Supply: 3.3V, 1.8V, –12V Start-Up Waveforms with Sequencing VOUT2 VOUT1 LT1941 VIN GND 0.22μF 22μF 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* 3.3μH 3μH 22μH 22μH 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 0.22μF 33μF 1μF 10μF *240mA AT VIN = 5V, 550mA AT VIN = 12V 10μF 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 RUN/SS 2V/DIV 2ms/DIV VOUT1 2V/DIV VOUT2 5V/DIV VOUT3 10V/DIV IVIN(AVE) 1A/DIV PGOOD2 5V/DIV 1941 F01b |
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Similar Description - LT1941_15 |
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