LTC3802 Dual 550kHz Synchronous 2-Phase DC/DC Controller with Programmable Up/Down Tracking UFEATURESDESCRIPTIO ■ Wide VIN Range: 3V to 30V Operation with Line The LTC®3802 is a dual switching regulator controller Feedforward Compensation optimized for high efficiency step-down conversion from ■ Leading Edge Modulation Architecture for input voltages between 3V to 30V. The controller uses a Extremely Low Duty Cycle Operation leading edge modulation scheme to allow extremely low ■ Phase-Lockable Fixed Frequency: 330kHz to 750kHz duty cycle operation. The constant frequency voltage mode ■ Two 180 ° Out-of-Phase Controllers controller allows a phase-lockable frequency between ■ Fast Programmable Power-Up/-Down Tracking 330kHz and 750kHz. Power loss and noise due to the ESR ■ Programmable Current Limit Without External of the input capacitors are minimized by operating the two Current Sense Resistor controller output stages 180° out of phase. The synchro- ■ Optional Burst Mode® Operation at Light Load nous buck architecture automatically shifts to Burst Mode ■ ±1% 0.6V Voltage Reference operation as the output load decreases, ensuring maxi- ■ External N-Channel MOSFET Architecture mum efficiency over a wide range of load currents. ■ Low Shutdown Current: <100µA The LTC3802 features an onboard, trimmed 0.6V refer- ■ Overvoltage Protection and PGOOD Flag ence and provides better than 1% regulation at the con- ■ Small 28-Lead SSOP and 32-Lead QFN Packages verter outputs. A separate output sense provides real time U overvoltage protection and PGOOD sensing. An FBT pin APPLICATIO S programs the power-up/-down tracking between the two ■ Notebook and Palmtop Computers channels to meet various sequencing requirements. A ■ Portable Instruments RUN/SS pin provides soft-start and externally program- ■ Battery-Operated Digital Devices mable current limit protection functions. ■ DC Power Distribution Systems , LTC and LT are registered trademarks of Linear Technology Corporation. Burst Mode is a registered trademark of Linear Technology Corporation. U.S. Patent Nos 5481178, 5846544, 6304066, 6580258, 5055767, 6307356 UTYPICAL APPLICATIO VIN 5V TO 22V + 56µF 4.7µF 5V 25V 25V + CMDSH-3 ×2 ×8 CMDSH-3 10µF Si7860DP Si7860DP ×2 TG1 PV ×2 CC TG2 1 V µH OUT1 BOOST2 1µH VOUT2 3.3V 0.1µF 0.1µF 2.5V 15A BOOST1 SW2 B340B 15A Si7440DP B340B SW1 BG2 10k 10k + 330µF ×2 330µF + BG1 PLLIN 10k 10k 4V Si7440DP PGND PLLLPF 4V ×3 ×2 47k 47k ×3 LTC3802 I I MAX1 MAX2 560pF 3.16k 3.16k FBT CMPIN2 2.21k 2.21k CMPIN1 VCC 5V 1500pF 2200pF 10 + Ω COMP1 COMP2 560pF 390Ω 15k 0.1µF 10µF FB1 FB2 330pF SGND PHASEMD 2200pF 1500pF 15k 390Ω FCB VINFF RUN/SS PGOOD 330pF 3802 TA01 0.1 10k µF V 5V IN 0.47µF 3802f 1
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