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LTC1704EGN Datasheet(PDF) 8 Page - Linear Technology |
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LTC1704EGN Datasheet(HTML) 8 Page - Linear Technology |
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8 / 28 page  LTC1704/LTC1704B 8 1704bfa PI FU CTIO S compensation and soft-start connections should return to GND. GND and PGND should connect only at a single point, near the PGND pin and the negative plate of the VIN bypass capacitor. REGFB (Pin 9): Linear Regulator Controller Feedback Input. REGFB should be connected through a resistor divider network to VOUTREG to set the output voltage of the linear regulator. REGILM (Pin 10): Linear Regulator Controller Current Limit Setting cum ON/OFF Control. This pin is internally servoed to 0.8V. An external resistor RREGILM between VCC and REGILM programs the REGILM pin input current. This current determines the maximum pass transistor base current and directly controls the linear regulator current sourcing capabilitiy. An external capacitor, CDELAY is added to this pin to control the turn-on time of the linear regula- tor, the minimum value for this capacitor is 100pF. Refer to the Linear Regulator Current Limit Programming sec- tion for more information on choosing RREGILM andCDELAY. Pulling REGILM to GND turns off the linear regulator. If both RUN/SS and REGILM are pulled low, the LTC1704 enters shutdown mode. VCC (Pin 11): Power Supply Input. All internal circuits except the switcher output drivers are powered from this pin. VCC should be connected to a low noise 5V supply, and should be bypassed to GND with at least a 10 µF capacitor in close proximity to the LTC1704. PGOOD (Pin 12): Power Good. PGOOD is an open-drain logic output. PGOOD pulls low if any of the two supply outputs are outside ±10% of their nominal levels. An external pull-up resistor is required at PGOOD to allow it to swing positive. PGND (Pin 13): Power Ground. The BG driver returns to this pin. Connect PGND to a high current ground node in close proximity to the sources of external MOSFET QB, and the VIN and VOUTSW bypass capacitors. BG (Pin 14): Switcher Controller Bottom Gate Drive. The BG pin drives the gate of the bottom N-channel synchro- nous switch MOSFET, QB. BG is designed to typically drive up to 10,000pF of gate capacitance. PVCC(Pin15):SwitcherControllerBottomGateDriverSup- ply. PVCC provides power to the BG output driver. PVCC must be connected to a voltage high enough to fully turn on the external MOSFET, QB. PVCCshouldgenerallybecon- nected directly to VIN, the main system 5V supply. PVCC requires at least a 10 µF bypass capacitor directly to PGND. BOOST (Pin 16): Switcher Controller Top Gate Driver Supply. The BOOST pin supplies power to the floating TG driver. Bypass BOOST to SW with a 1 µF capacitor. An external Schottky diode from VIN to BOOST creates a complete floating charge-pumped supply at BOOST. No other external supplies are required. TEST CIRCUIT TG SW IMAX RUN/SS COMP FB REGDR GND BOOST PVCC BG PGND PGOOD VCC REGILM REGFB 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 LTC1704 2000pF 80k RREGILM 100k 10 µF 5V IBOOST + 100pF 1704 TC IPVCC IVCC 250k 100 Ω VFB fOSC 2k 1 µF 2000pF |
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