Datasheet LTC3561A (Analog Devices) - 6

LTC3561A
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, VIN = 3.6V, fO = 1MHz, unless otherwise noted. Load Step VOUT Short to Ground
VOUT 100mV/DIV VOUT AC COUPLED 1V/DIV IL 1A/DIV IL 2A/DIV ILOAD 1A/DIV VIN = 3.6V 3561A G25 40µs/DIV VIN = 3.6V 3561A G26 40µs/DIV VOUT = 1.8V VOUT = 1.8V ILOAD = 200mA to 1A ILOAD = 0A
PIN FUNCTIONS SHDN/RT (Pin 1):
Combination Shutdown and Timing
PVIN (Pin 5):
Main Supply Pin. Must be closely decoupled Resistor Pin. The oscillator frequency is programmed by to PGND. connecting a resistor from this pin to ground. Forcing
SV
this pin to SV
IN (Pin 6):
The Signal Power Pin. All active circuitry IN causes the device to be shut down. In is powered from this pin. Must be closely decoupled to shutdown all functions are disabled. SGND. SVIN must be greater than or equal to PVIN.
SGND (Pin 2):
Signal Ground. All SGND and PGND pins
V
must be connected together through a thick copper trace
FB (Pin 7):
Receives the feedback voltage from the ex- ternal resistive divider across the output. Nominal voltage or ground plane. for this pin is 0.8V.
SW (Pin 3):
The Switch Node Connection to the Inductor.
I
This pin swings from PV
TH (Pin 8):
Error Amplifier Compensation Point. The IN to PGND. current comparator threshold increases with this control
PGND (Pin 4/Exposed Pad Pin 9):
Power Ground Pins. voltage. Nominal voltage range for this pin is 0.4V to 1.4V. Connect to the (–) terminal of COUT and (–) terminal of CIN. The exposed pad must be soldered to electrical ground of the PCB. All SGND and PGND pins must be connected together through a thick copper trace or ground plane.
NOMINAL (V) ABSOLUTE MAX (V) PIN NAME DESCRIPTION MIN TYP MAX MIN MAX
1 SHDN/RT Shutdown/Timing Resistor –0.3 0.8 SVIN –0.3 SVIN + 0.3 2 SGND Signal Ground 0 3 SW Switch Node 0 PVIN –0.3 PVIN + 0.3 4 PGND Main Power Ground 0 5 PVIN Main Power Supply –0.3 5.5 –0.3 SVIN + 0.3 6 SVIN Signal Power Supply 2.5 5.5 –0.3 6 7 VFB Output Feedback Pin 0 0.8 1.0 –0.3 SVIN + 0.3 8 ITH Error Amplifier Compensation and Run Pin 0.4 1.4 –0.3 SVIN + 0.3 3561afa 6 For more information www.linear.com/LTC3561A