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LTC1702I Datasheet(PDF) 7 Page - Linear Technology |
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LTC1702I Datasheet(HTML) 7 Page - Linear Technology |
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7 / 36 page  7 LTC1702 TEST CIRCUIT Test Circuit 1 controllers allow, improving stability and maximizing tran- sient response. The 800mV internal reference allows regulated output voltages as low as 800mV without exter- nal level shifting amplifiers. The LTC1702’s synchronous switching logic transitions automatically into Burst Mode operation, maximizing effi- ciency with light loads. Onboard power-good and over- voltage (OV) fault flags indicate when the output is in regulation or an OV fault has occurred. The OV flag can be set to latch the device off when an OV fault has occurred, or to automatically resume operation when the fault is removed. The LTC1702 takes a low input voltage and generates two lower output voltages at very high currents. Its strengths are small size, unmatched regulation and transient response and high efficiency. This combination makes it ideal for providing multiple low voltage logic supplies to microprocessors or high density ASICs in systems using a “2-step” regulation architecture, used in portable and advanced desktop computers. OVERVIEW The LTC1702 is a dual, step-down (buck), voltage mode feedback switching regulator controller. It is designed to be used in a synchronous switching architecture with two external N-channel MOSFETs per channel. It is intended to operate from a low voltage input supply (7V maximum) and provide a high power, high efficiency, precisely regu- lated output voltage. Several features make it particularly suited for microprocessor supply regulation. Output regu- lation is extremely tight, with DC line and load regulation and initial accuracy better than 1%, and total regulation including transient response inside of 3% with a properly designed circuit. The 550kHz switching frequency allows the use of physically small, low value external components without compromising performance. The LTC1702’s internal feedback amplifier is a 25MHz gain-bandwidth op amp, allowing the use of complex multipole/zero compensation networks. This allows the feedback loop to maintain acceptable phase margin at higher frequencies than traditional switching regulator APPLICATIONS INFORMATION VCC 5V 5V 10k 2k CL CL CL CL BOOST1 TG1 BG1 SW1 IMAX1 FCB PGOOD1 RUN/SS1 COMP1 FB1 LTC1702 BOOST2 TG2 BG2 SW2 IMAX2 PGOOD2 FAULT RUN/SS2 COMP2 FB2 0.1 µF 100 µF VPGOOD1 VFB1 VFB2 VPGOOD2 VFAULT IBOOST1 ICC IPVCC IBOOST2 fOSC MEASURED 1702 TC PVCC GND PGND + 2k 5V 10k |
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