LM2596R-3.3_Datasheet

3.0A, 150kHz, Step-Down Switching Regulator LM2596
Jan. 2015 - Rev. 1.4.2 - 8 - HTC
PIN FUNCTION DESCRIPTION
Package
Symbol
Description
TO-220 5L
TO-263 5L
SOP8-PP
1
1
VIN
This pin is the positive input supply for the LM2596 step–down
switching regulator. In order to minimize voltage transients and to
supply the switching currents needed by the regulator, a suitable
input bypass capacitor must be present.
2
2
VOUT
This is the emitter of the internal switch. The saturation voltage
Vsat of this output switch is typically 1.5 V. It should be kept in mind
that the PCB area connected to this pin should be kept to a
minimum in order to minimize coupling to sensitive circuitry.
3
3
GND
Circuit ground pin.
4
4
FEEDBACK
This pin senses regulated output voltage to complete the feedback
loop. The signal is divided by the internal resistor divider network
R2, R1 and applied to the non–inverting input of the internal error
amplifier. In the Adjustable version of the LM2596 switching
regulator this pin is the direct input of the error amplifier and the
resistor network R2, R1 is connected externally to allow
programming of the output voltage.
5
5
ON/OFF
It allows the switching regulator circuit to be shut down using logic
level signals, thus dropping the total input supply current to
approximately 80uA. The threshold voltage is typically 1.3V.
Applying a voltage above this value (up to +Vin) shuts the regulator
off. If the voltage applied to this pin is lower than 1.3V or if this pin is
left open, the regulator will be in the "on" condition.
-
6, 7, 8
N.C.
No Connect.