Datasheet LTC3562 (Analog Devices) - 7

LTC3562
PIN FUNCTIONS AGND (Pin 1):
Analog Ground Pin. All small-signal com-
OUT600B (Pin 13):
Output Voltage Feedback Pin for ponents should connect to this ground, which in turn R600B. An I2C programmable internal resistor divider connects to PGND at one point. divides the output voltage down for comparison to the internal reference voltage. This pin converges to 1 of
FB400A (Pin 2):
Feedback Pin for R400A. When the con- 128 possible set-points based on the programmed value trol loop is complete, this pin servos to 1 of 16 possible from the I2C serial port (see Tables 5 and 6). This node set-points based on the programmed value from the I2C must be bypassed to GND with a 10μF or greater ceramic serial port (see Table 4). capacitor.
OUT400B (Pin 3):
Output Voltage Feedback Pin for
FB600A (Pin 14):
Feedback Pin for R600A. When the con- R400B. An I2C programmable internal resistor divider trol loop is complete, this pin servos to 1 of 16 possible divides the output voltage down for comparison to the set-points based on the programmed value from the I2C internal reference voltage. This pin converges to 1 of serial port (see Table 4). 128 possible set-points based on the programmed value from the I2C serial port (see Tables 5 and 6). This node
POR600A (Pin 15):
Power-On Reset for R600A. This open- must be bypassed to GND with a 10μF or greater ceramic drain output goes high impedance after a 230ms delay capacitor. after the output of R600A reaches 92% of its regulation voltage. This output gets pulled to GND whenever R600A
SW400B (Pin 4):
Switch Node Connection to the Inductor falls below 92% of its regulation voltage. for R400B. This pin connects to the drains of the internal power MOSFET switches of R400B.
RUN400A (Pin 16):
Enable Pin for R400A, Active High. Apply a voltage greater than 1V to enable this regulator.
PGND (Pins 5, 11):
Power Ground Pin. Connect this pin closely to the (–) terminal of CIN.
RUN600A (Pin 17):
Enable Pin for R600A, Active Low. Apply a voltage less than 0.3V to enable this regulator.
SW400A (Pin 6):
Switch Node Connection to the Inductor for R400A. This pin connects to the drains of the internal
DVCC (Pin 18):
Supply Voltage for I2C Lines. This pin sets the power MOSFET switches of R400A. logic reference level of the LTC3562. A UVLO circuit on the DV
V
CC pin forces all registers to a default setting whenever
IN (Pins 7, 8, 9):
Input Supply Pin. This pin must be DV closely decoupled to GND with a 10μF or greater ceramic CC is < 1V. Bypass to GND with a 0.1μF capacitor. capacitor.
SCL (Pin 19):
I2C Clock Input. Serial data is shifted one bit per clock to control the LTC3562. The logic level for
SW600A (Pin 10):
Switch Node Connection to the Inductor SCL is referenced to DV for R600A. This pin connects to the drains of the internal CC. power MOSFET switches of R600A.
SDA (Pin 20):
I2C Data Input. The logic level for SDA is referenced to DV
SW600B (Pin 12):
Switch Node Connection to the Inductor CC. for R600B. This pin connects to the drains of the internal
Exposed Pad (Pin 21):
Ground. Must be soldered to power MOSFET switches of R600B. PCB ground for electrical contact and optimum thermal performance. 3562fa 7