Datasheet LTC3826-1 (Analog Devices) - 8
| Fabricante | Analog Devices |
| Descripción | 30µA IQ, Dual, 2-Phase Synchronous Step-Down Controller |
| Páginas / Página | 32 / 8 — PIN FUNCTIONS. RUN1, RUN2 (Pins 8, 9):. BOOST1, BOOST2 (Pins 24, 17):. … |
| Formato / tamaño de archivo | PDF / 438 Kb |
| Idioma del documento | Inglés |
PIN FUNCTIONS. RUN1, RUN2 (Pins 8, 9):. BOOST1, BOOST2 (Pins 24, 17):. INTVCC (Pin 19):. SW1, SW2 (Pins 25, 16):
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LTC3826-1
PIN FUNCTIONS RUN1, RUN2 (Pins 8, 9):
Digital Run Control Inputs for
BOOST1, BOOST2 (Pins 24, 17):
Bootstrapped Supplies Each Controller. Forcing either of these pins below 0.7V to the Topside Floating Drivers. Capacitors are connected shuts down that controller. Forcing both of these pins between the BOOST and SW pins and Schottky diodes are below 0.7V shuts down the entire LTC3826-1, reducing tied between the BOOST and INTVCC pins. Voltage swing quiescent current to approximately 4μA. at the BOOST pins is from INTVCC to (VIN + INTVCC).
INTVCC (Pin 19):
Output of the Internal Linear Low Dropout
SW1, SW2 (Pins 25, 16):
Switch Node Connections to Regulator. The driver and control circuits are powered Inductors. Voltage swing at these pins is from a Schottky from this voltage source. Must be decoupled to power diode (external) voltage drop below ground to VIN. ground with a minimum of 4.7μF tantalum or other low
TG1, TG2 (Pins 26, 15):
High Current Gate Drives for ESR capacitor. Top N-Channel MOSFETs. These are the outputs of fl oat-
EXTVCC (Pin 20):
External Power Input to an Internal LDO ing drivers with a voltage swing equal to INTVCC – 0.5V Connected to INTVCC. This LDO supplies INTVCC power, superimposed on the switch node voltage SW. bypassing the internal LDO powered from VIN whenever
PGOOD1 (Pin 27):
Open-Drain Logic Output. PGOOD1 is EXTVCC is higher than 4.7V. See EXTVCC Connection in pulled to ground when the voltage on the V the Applications Information section. Do not exceed 10V FB1 pin is not within ±10% of its set point. on this pin.
TRACK/SS1, TRACK/SS2 (Pins 28, 14):
External Track-
PGND (Pin 21):
Driver Power Ground. Connects to the sources ing and Soft-Start Input. The LTC3826-1 regulates the of bottom (synchronous) N-channel MOSFETs, anodes of V the Schottky rectifi ers and the (–) terminal(s) of C FB1,2 voltage to the smaller of 0.8V or the voltage on the IN. TRACK/SS1,2 pin. A internal 1μA pull-up current source
VIN (Pin 22):
Main Supply Pin. A bypass capacitor should is connected to this pin. A capacitor to ground at this be tied between this pin and the signal ground pin. pin sets the ramp time to fi nal regulated output voltage. Alternatively, a resistor divider on another voltage supply
BG1, BG2 (Pins 23, 18):
High Current Gate Drives for Bot- connected to this pin allows the LTC3826-1 output to track tom (Synchronous) N-Channel MOSFETs. Voltage swing the other supply during startup. at these pins is from ground to INTVCC. 38261fb 8
PIN FUNCTIONS RUN1, RUN2 (Pins 8, 9):
Digital Run Control Inputs for
BOOST1, BOOST2 (Pins 24, 17):
Bootstrapped Supplies Each Controller. Forcing either of these pins below 0.7V to the Topside Floating Drivers. Capacitors are connected shuts down that controller. Forcing both of these pins between the BOOST and SW pins and Schottky diodes are below 0.7V shuts down the entire LTC3826-1, reducing tied between the BOOST and INTVCC pins. Voltage swing quiescent current to approximately 4μA. at the BOOST pins is from INTVCC to (VIN + INTVCC).
INTVCC (Pin 19):
Output of the Internal Linear Low Dropout
SW1, SW2 (Pins 25, 16):
Switch Node Connections to Regulator. The driver and control circuits are powered Inductors. Voltage swing at these pins is from a Schottky from this voltage source. Must be decoupled to power diode (external) voltage drop below ground to VIN. ground with a minimum of 4.7μF tantalum or other low
TG1, TG2 (Pins 26, 15):
High Current Gate Drives for ESR capacitor. Top N-Channel MOSFETs. These are the outputs of fl oat-
EXTVCC (Pin 20):
External Power Input to an Internal LDO ing drivers with a voltage swing equal to INTVCC – 0.5V Connected to INTVCC. This LDO supplies INTVCC power, superimposed on the switch node voltage SW. bypassing the internal LDO powered from VIN whenever
PGOOD1 (Pin 27):
Open-Drain Logic Output. PGOOD1 is EXTVCC is higher than 4.7V. See EXTVCC Connection in pulled to ground when the voltage on the V the Applications Information section. Do not exceed 10V FB1 pin is not within ±10% of its set point. on this pin.
TRACK/SS1, TRACK/SS2 (Pins 28, 14):
External Track-
PGND (Pin 21):
Driver Power Ground. Connects to the sources ing and Soft-Start Input. The LTC3826-1 regulates the of bottom (synchronous) N-channel MOSFETs, anodes of V the Schottky rectifi ers and the (–) terminal(s) of C FB1,2 voltage to the smaller of 0.8V or the voltage on the IN. TRACK/SS1,2 pin. A internal 1μA pull-up current source
VIN (Pin 22):
Main Supply Pin. A bypass capacitor should is connected to this pin. A capacitor to ground at this be tied between this pin and the signal ground pin. pin sets the ramp time to fi nal regulated output voltage. Alternatively, a resistor divider on another voltage supply
BG1, BG2 (Pins 23, 18):
High Current Gate Drives for Bot- connected to this pin allows the LTC3826-1 output to track tom (Synchronous) N-Channel MOSFETs. Voltage swing the other supply during startup. at these pins is from ground to INTVCC. 38261fb 8