LTC3728LCGN#TR

Product Summary

The LTC3728LCGN#TR is a dual high performance step-down switching regulator controller that drive all N-channel synchronous power MOSFET stages. A constant frequency current mode architecture allows phaselockable frequency of up to 550kHz. Power loss and noise due to the ESR of the input capacitors are minimized by operating the two controller output stages out of phase. OPTI-LOOP compensation allows the transient response to be optimized over a wide range of output capacitance and ESR values. The applications of the LTC3728LCGN#TR are (1)notebook and palmtop computers; (2)telecom systems; (3)portable instruments; (4)battery-operated digital devices; (5)DC power distributiosystems.

Parametrics

LTC3728LCGN#TR absolute maximum ratings: (1)Input Supply Voltage (VIN): 30V to -0.3V; (2)Top Side Driver Voltages (BOOST1, BOOST2): 36V to -0.3V; (3)Switch Voltage (SW1, SW2): 30V to -5V; (4)INTVCC, EXTVCC, RUN/SS1, RUN/SS2, (BOOST1-SW1), (BOOST2-SW2), PGOOD: 7V to -0.3V; (5)SENSE1+, SENSE2 +, SENSE1-, SENSE2- Voltages: (1.1)INTVCC to -0.3V; (6)PLLIN, PLLFLTR, FCB, Voltage: INTVCC to -0.3V; (7)ITH1, ITH2, VOSENSE1, VOSENSE2 Voltages: 2.7V to -0.3V; (8)Peak Output Current <10ms (TG1, TG2, BG1, BG2): 3A; (9)INTVCC Peak Output Current: 40mA; (10)Operating Temperature Range: 0°C to 85°C; (11)Junction Temperature: 125°C; (12)Storage Temperature Range: - 65°C to 125°C; (13)Reflow Peak Body Temperature (UH Package): 260°C; (14)Lead Temperature (Soldering, 10 sec)(GN Package): 300°C.

Features

LTC3728LCGN#TR features: (1)Dual, 180° Phased Controllers Reduce Required Input Capacitance and Power Supply Induced Noise; (2)OPTI-LOOP CompensatioMinimizes COUT; (3)±1% Output Voltage Accuracy (LTC3728LC); (4)Power Good Output Voltage Indicator; (5)Phase-Lockable Fixed Frequency 250kHz to 550kHz; (6)Dual N-Channel MOSFET Synchronous Drive; (7)Wide VIN Range: 4.5V to 28V Operation; (8)Very Low Dropout Operation: 99% Duty Cycle; (9)Adjustable Soft-Start Current Ramping; (10)Foldback Output Current Limiting; (11)Latched Short-Circuit Shutdowwith Defeat Option; (12)Output Overvoltage Protection; (13)Low ShutdowIQ: 20mA; (14)5V and 3.3V Standby Regulators; (15)3 Selectable Operating Modes: Constant Frequency, Burst Mode Operatioand PWM.

Diagrams