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LTC3703 Datasheet(PDF) 1 Page - Linear Technology |
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LTC3703 Datasheet(HTML) 1 Page - Linear Technology |
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1 / 32 page  LTC3703 1 3703f APPLICATIO S DESCRIPTIO FEATURES TYPICAL APPLICATIO , LTC and LT are registered trademarks of Linear Technology Corporation. s High Voltage Operation: Up to 100V s Large 1 Ω Gate Drivers s No Current Sense Resistor Required s Step-Up or Step-Down DC/DC Converter s Dual N-Channel MOSFET Synchronous Drive s Excellent Transient Response and DC Line Regulation s Programmable Constant Frequency: 100kHz to 600kHz s ±1% Reference Accuracy s Synchronizable up to 600kHz s Selectable Pulse Skip Mode Operation s Low Shutdown Current: 50 µA Typ s Programmable Current Limit s Undervoltage Lockout s Programmable Soft-Start s 16-Pin Narrow SSOP and 28-Pin SSOP Packages The LTC ®3703 is a synchronous step-down switching regulator controller that can directly step-down voltages from up to 100V, making it ideal for telecom and automo- tive applications. The LTC3703 drives external N-channel MOSFETs using a constant frequency (up to 600kHz), voltage mode architecture. The external component count has been minimized, providing a compact overall solution footprint. A precise internal reference provides 1% DC accuracy. A high bandwidth error amplifier and patented line feed forward compensation provide very fast line and load transient response. Strong 1 Ω gate drivers allow the LTC3703 to drive multiple MOSFETs for higher current applications. The operating frequency is user program- mable from 100kHz to 600kHz and can also be synchro- nized to an external clock for noise-sensitive applications. Current limit is programmable with an external resistor and utilizes the voltage drop across the synchronous MOSFET to eliminate the need for a current sense resistor. Soft- start is provided by an external capacitor. Pulling the soft-start pin low shuts down the LTC3703, reducing supply current to 50 µA. s 48V Telecom and Base Station Power Supplies s Networking Equipment, Servers s Automotive and Industrial Control 100V Synchronous Switching Regulator Controller Efficiency vs Load Current Figure 1. High Efficiency High Voltage Step-Down Converter LTC3703 MODE/SYNC FSET COMP FB IMAX INV RUN/SS GND VIN BOOST TG SW VCC DRVCC BG BGRTN 22 µF ×2 3300pF 1500pF 22k 330 Ω 113k 1% 8.06k 1% 10 Ω 15k 30k 0.1 µF VIN 15V TO 100V Si7456DP 8 µH MBR1100 VOUT 12V 5A 220 µF 25V ×2 BAS21 VCC 9.3V TO 15V 0.1 µF 3703 F01 10 µF 1 µF + + + Si7456DP 22 µF 25V 15pF LOAD (A) 0 100 95 90 85 80 4 3703 F01b 1 2 3 5 VIN = 25V VIN = 50V VIN = 75V |
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