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LTC1704 Datasheet(PDF) 7 Page - Linear Technology |
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LTC1704 Datasheet(HTML) 7 Page - Linear Technology |
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7 / 28 page  LTC1704/LTC1704B 7 1704bfa PI FU CTIO S TG (Pin 1): Switcher Controller Top Gate Drive. The TG pin drives the gate of the top N-channel MOSFET, QT. The TG driver draws power from the BOOST pin and returns it to the SW pin, providing true floating drive to QT. TG is de- signed to typically drive up to 10,000pF of gate capacitance. SW (Pin 2): Switcher Controller Switching Node. Connect SW to the switching node of the main converter. The TG driver ground returns to SW, providing floating gate drive to the top N-channel MOSFET, QT. The voltage at SW is compared to IMAX by the current limit comparator while the bottom MOSFET, QB is on. The Burst comparator (BURST, see Block Diagram) monitors the potential at SW and switches to Burst Mode operation under light load conditions. IMAX (Pin 3): Switcher Controller Current Limit Set. The IMAX pin sets the current limit comparator threshold for the switcher controller. If the voltage drop across the bottom MOSFET, QB, exceeds the magnitude of the volt- age at IMAX, the switcher controller enters current limit. The IMAX pin has an internal 10µA current source pull-up, allowing the current threshold to be set with a single external resistor to PGND. Kelvin connect this current setting resistor to the source of QB. Refer to the Current Limit Programming section for more information on choos- ing RIMAX. RUN/SS (Pin 4): Switcher Controller Soft-Start. A capaci- tor from RUN/SS to GND controls the turn-on time and rate of rise of the switcher output voltage at power up. An internal 3 µA current source pull-up at RUN/SS sets the turn-on time at approximately 300ms/ µF. If both RUN/SS and REGILM are pulled low, the LTC1704 enters shutdown mode. COMP (Pin 5): Switcher Controller Loop Compensation. The COMP pin is connected directly to the output of the switcher controller’s error amplifier and the input to the PWM comparator. Use an RC network between the COMP pin and the FB pin to compensate the feedback loop for optimum transient response. FB (Pin 6): Switcher Controller Feedback Input. FB should be connected through a resistor divider network to VOUTSW to set the switcher output voltage. Also, connect the switcher loop compensation network to FB. REGDR (Pin 7): Linear Regulator Controller Driver Output. Connect REGDR to the base of the external NPN Pass transistor. The REGILM pin input current controls the linear regulator controller maximum driving capability. GND (Pin 8): Signal Ground. All internal low power cir- cuitry returns to the GND pin. Connect to a low impedance ground, separated from the PGND node. All feedback, TYPICAL PERFOR A CE CHARACTERISTICS Supply Current vs Temperature IPVCC, IBOOST vs Driver Load TEMPERATURE ( °C) –50 0 1.5 3.0 4.5 6.0 –25 0 25 50 1704 G26 75 100 125 IVCC IPVCC IBOOST VCC = PVCC = BOOST = 5V TG, BG FLOAT TG, BG LOAD (pF) 0 0 5 15 20 25 35 1704 G27 10 30 4000 10000 2000 6000 8000 TA = 25°C PVCC = BOOST = 5V |
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Similar Description - LTC1704 |
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