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LTC1702A Datasheet(PDF) 1 Page - Linear Technology |
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LTC1702A Datasheet(HTML) 1 Page - Linear Technology |
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1 / 36 page  1 LTC1702A 1702afa Dual 550kHz Synchronous 2-Phase Switching Regulator Controller The LTC ®1702A is a dual switching regulator controller optimized for high efficiency with low input voltages. It includestwocomplete,on-chip,independentswitchingregu- lator controllers each designed to drive a pair of external N- channel MOSFETs in a voltage mode feedback, synchronous buck configuration. The LTC1702A uses a constant-fre- quency, true PWM design switching at 550kHz, minimizing external component size and cost and maximizing load transient performance. The synchronous buck architecture automatically shifts to discontinuous and then to Burst Mode ® operation as the output load decreases, ensuring maximum efficiency over a wide range of load currents. The LTC1702A features an onboard reference trimmed to 0.5% and can provide better than 1% regulation at the converteroutputs.Open-drainlogicoutputsindicatewhether either output has risen to within 5% of the final output voltage and an optional latching FAULT mode protects the load if the output rises 15% above the intended voltage. Each channel can be enabled independently; with both channels disabled, the LTC1702A shuts down and supply current drops below 100 µA. ■ Pin Compatible with the LTC1702 with Improved Current Limit Control ■ Two Sides Run Out-of-Phase to Minimize CIN ■ No External Current Sense Resistors ■ Excellent Output Regulation: 1% Total Output Accuracy ■ Two Independent Controllers in One Package ■ All N-Channel External MOSFET Architecture ■ 550kHz Switching Frequency Minimizes External Component Size ■ 1A to 25A Output Current per Channel ■ High Efficiency over Wide Load Current Range ■ Less Than 100 µA Shutdown Current ■ Small 24-Pin Narrow SSOP Package , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. Burst Mode is a registered trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents including 6144194. ■ Microprocessor, DSP Core and I/O Supplies ■ Multiple Logic Supply Generator ■ Distributed Power Applications ■ High Efficiency Power Conversion Dual Output High Power 3.3V/2.5V Logic Supply DESCRIPTIO FEATURES APPLICATIO S TYPICAL APPLICATIO LTC1702A PVCC BOOST1 BG1 TG1 SW1 IMAX1 PGOOD1 FCB RUN/SS COMP1 SGND FB1 IMAX2 BOOST2 BG2 TG2 SW2 PGND PGOOD2 FAULT RUN/SS2 COMP2 FB2 VCC 1 2 3 4 5 6 7 8 9 10 11 12 24 23 22 21 20 19 18 17 16 15 14 13 1 µF 10 Ω 1 µF 1 µF 11.8k 11.8k 1.6k 68k 1702 TA01 VIN 1.2k 10k 1% COUT1 180 µF ×4 820pF 27pF 680pF 47k 1 µF VOUT1 2.5V AT 15A 1 µF 4.75k 1% Q2 Q1 Q4 Q3 D3 D2 COUT1, COUT2: PANASONIC EEFUE0G181R CIN: KEMET TS10X337M010AS D1, D2: MOTOROLA MBR0520LT1 D3, D4: MOTOROLA MBRS320T3 L1, L2: SUMIDA CEP125-1R0 Q1 TO Q8: FAIRCHILD FDS6670A D1 PWRGD1 L1 1 µH + 10 µF 10 µF 1 µF VIN = 5V ±10% 1 µF CIN 330 µF ×3 + Q7 Q5 Q8 Q6 D4 680pF 27pF 3300pF 15.8k 1% 4.99k 1% 10k L2 1 µH COUT2 180 µF ×4 1 µF VOUT2 3.3V AT 15A PWRGD2 FAULT + VIN 10k |
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