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LM2594
12 V
Unregulated
Feedback
DC Input
+V IN
LM2594
4
L1
C FF
R1 = 1 k W
R2 = 3k
7
Output
8
100 m H
V OUT = 5 V; I load = 0.5 A
C IN = 68 m F
5
ON/OFF
6
GND
D1
C OUT
220 m F
1N5817
Figure 1. Typical Application
0.5
Figure 2. Representative Block Diagram
PIN FUNCTION DESCRIPTION
Pin No.
1 ? 3
4
5
6
7
8
Symbol
NC
FB
ON/OFF
GND
+V IN
OUTPUT
Description (Refer to Figure 1)
Not Connected
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.
Allows the switching regulator circuit to be shut down using logic levels, thus dropping the total input supply
current to approximately 50 m A. The threshold voltage is typical. 1.6 V. Applying a voltage above this value
(up to V IN ) shuts the regulator off. If the voltage applied to this pin is lower than 1.6 V or if this pin is left open,
the regulator will be in the “on” condition.
Circuit ground pin. See the information about the printed circuit board layout.
Positive input supply for LM2594 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
(C IN in Figure 1)
Emitter of the internal switch. The saturation voltage Vsat of the output switch is typically 1 V. It should be
kept in mind that PCB area connected to this pin should be kept to a minimum in order to minimize coupling
to sensitive circuitry
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