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LTC1704 データシート(PDF) 1 Page - Linear Technology |
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LTC1704 データシート(HTML) 1 Page - Linear Technology |
1 / 28 page LTC1704/LTC1704B 1 1704bfa DESCRIPTIO FEATURES APPLICATIO S TYPICAL APPLICATIO The LTC ®1704/LTC1704B include a high power synchro- nous switching regulator controller plus a linear regulator controller. The switching regulator controller is designed to drive a pair of N-channel MOSFETs in a voltage mode, synchronous buck configuration to provide the main sup- ply. The constant frequency, true PWM architecture switches at 550kHz, minimizing external component size, cost and optimizing load transient performance. The LTC1704 features automatic transition to power saving Burst Mode operation at light loads. The LTC1704B does not shift into Burst Mode operation at light loads, eliminat- ing low frequency output ripple at the expense of light load efficiency. The linear regulator controller is designed to drive an external NPN power transistor to provide up to 2A of current to an auxiliary load. The LTC1704/LTC1704B deliver better than ±1.5% DC accuracy at the switcher outputs and ±2% at the linear regulator outputs. High performance feedback loops allow the circuit to keep total output regulation within ±5% under all transient conditions. An open-drain PGOOD output indicates when both outputs are within ±10% of their regulated values. s Multiple Logic Supply Generator s Distributed Power Applications s High Efficiency Power Conversion , LTC and LT are registered trademarks of Linear Technology Corporation. s Dual Regulated Outputs: One Switching Regulator and One Linear Regulator s Excellent DC Accuracy: ±1.5% for Switcher and ±2% for Linear Regulator s External N-Channel MOSFET Architecture s No External Current Sense Resistor Required s Burst Mode ® Operation at Light Load (LTC1704) s Continuous Switching at Light Load (LTC1704B) s Linear Regulator with Programmable Current Limit s Linear Regulator with Programmable Start-Up Delay s Low Shutdown Current: <150 µA s High Efficiency Over Wide Load Current Range s PGOOD Flag Monitors Both Outputs s Small 16-Pin Narrow SSOP Package 550kHz Synchronous Switching Regulator Controller Plus Linear Regulator Controller Burst Mode is a registered trademark of Linear Technology Corporation. 5V to 1.8V/15A and 1.5V/2A Application BOOST TG SW PGOOD REGILM CCP 1 µF 10 Ω 13.7k 11k 1.8k 10k 8.06k 1800pF 5k 470k 10 µF 10 µF MBR0520LT1 16 1 2 QTB 1 µF L1 0.68 µH 11 12 10 0.1 µF 1000pF ON SEMI D44H11 698 Ω 806 Ω RUN/SS 4 GND 8 REGDR 7 REGFB 9 1704 TA01 PVCC LTC1704 VCC QTA BG 14 IMAX 3 PGND 13 COMP 5 FB 6 QBA QBB + 100 µF TANT VOUTREG 1.5V 2A VOUTSW 330pF 1800pF CIN: KEMET T510X337K010AS COUTSW: PANASONIC EEFUE0G181R L: SUMIDA CEP125-4712-T007 QTA, QTB, QBA, QBB: FAIRCHILD FDS6670A + + COUTSW 180 µF 4V ×6 CIN 330 µF 10V ×3 VIN 5V VOUTSW 1.8V 15A + + 15 ILOAD (A) 0 80 90 100 12 1704 G04 70 60 50 3 6 9 15 VIN = 5V VOUTSW = 1.8V TA = 25°C QT = QB = 2xFDS6670A Switcher Efficiency |
同様の部品番号 - LTC1704_15 |
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同様の説明 - LTC1704_15 |
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