Datasheet LTC3808 (Analog Devices) - 8
| Hersteller | Analog Devices |
| Beschreibung | No RSENSE , Low EMI, Synchronous DC/DC Controller with Output Tracking |
| Seiten / Seite | 28 / 8 — PI FU CTIO S (DFN/SSOP). SENSE– (Pin 13/Pin 15):. GND (Pin 15/Pins 1, … |
| Dateiformat / Größe | PDF / 386 Kb |
| Dokumentensprache | Englisch |
PI FU CTIO S (DFN/SSOP). SENSE– (Pin 13/Pin 15):. GND (Pin 15/Pins 1, 9):. SW (Pin 14/Pin 16):. FU CTIO AL DIAGRA
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LTC3808
U U U PI FU CTIO S (DFN/SSOP) SENSE– (Pin 13/Pin 15):
Negative Input to Differential Normally this pin is connected to the drain of the external Current Comparator. Normally is connected to the SW pin P-channel MOSFET, the drain of the external N-channel when the sense resistor is not used. When using a current MOSFET and the inductor. sense resistor, connect the resistor between SENSE+ and
GND (Pin 15/Pins 1, 9):
Ground connection for internal SENSE– and connect the source of the P-channel MOSFET circuits, the gate drivers and the negative input to the to the SENSE– pin. reverse current comparator. The exposed pad (Pin 15 in
SW (Pin 14/Pin 16):
Switch Node Connection to Inductor. DFN package) must be soldered to the PCB ground. This pin is also an input to the reverse current comparator.
U U W FU CTIO AL DIAGRA
VIN CIN VIN SENSE– SENSE+ IPRG PV VOLTAGE VREF SLOPE IN TG REFERENCE 0.6V CLK S MP + Q GND ICMP R UNDERVOLTAGE SENSE+ SWITCHING L LOCKOUT – LOGIC AND ANTI-SHOOT- V BLANKING THROUGH OUT VIN CIRCUIT SW COUT PVIN VIN BG UVSD MN 0.7µA RUN + GND FCB t = 1ms VIN INTERNAL SLEEP 0.15V + SOFT-START – OV IREV – 0.68V BURSTDIS 1µA R MUX TRK/SS B TRACK/SS 0.3V + + 0.54V SYNC/MODE BURST DEFEAT BURSTDIS UV FCB PHASE CLOCK DETECT DETECTOR – – VFB 0.4V ITH 2.6µA RC VREF + 0.6V CC EAMP + TRK/SS PLLLPF VFB – VCO R CLK A VIN 3808 FD + SW PGOOD I RICMP OV REV UV – GND UVSD GND 3808f 8
U U U PI FU CTIO S (DFN/SSOP) SENSE– (Pin 13/Pin 15):
Negative Input to Differential Normally this pin is connected to the drain of the external Current Comparator. Normally is connected to the SW pin P-channel MOSFET, the drain of the external N-channel when the sense resistor is not used. When using a current MOSFET and the inductor. sense resistor, connect the resistor between SENSE+ and
GND (Pin 15/Pins 1, 9):
Ground connection for internal SENSE– and connect the source of the P-channel MOSFET circuits, the gate drivers and the negative input to the to the SENSE– pin. reverse current comparator. The exposed pad (Pin 15 in
SW (Pin 14/Pin 16):
Switch Node Connection to Inductor. DFN package) must be soldered to the PCB ground. This pin is also an input to the reverse current comparator.
U U W FU CTIO AL DIAGRA
VIN CIN VIN SENSE– SENSE+ IPRG PV VOLTAGE VREF SLOPE IN TG REFERENCE 0.6V CLK S MP + Q GND ICMP R UNDERVOLTAGE SENSE+ SWITCHING L LOCKOUT – LOGIC AND ANTI-SHOOT- V BLANKING THROUGH OUT VIN CIRCUIT SW COUT PVIN VIN BG UVSD MN 0.7µA RUN + GND FCB t = 1ms VIN INTERNAL SLEEP 0.15V + SOFT-START – OV IREV – 0.68V BURSTDIS 1µA R MUX TRK/SS B TRACK/SS 0.3V + + 0.54V SYNC/MODE BURST DEFEAT BURSTDIS UV FCB PHASE CLOCK DETECT DETECTOR – – VFB 0.4V ITH 2.6µA RC VREF + 0.6V CC EAMP + TRK/SS PLLLPF VFB – VCO R CLK A VIN 3808 FD + SW PGOOD I RICMP OV REV UV – GND UVSD GND 3808f 8