TS2580

2A / 52KHz Buck Switching Regulator

3/5

Version: B11

Pin Function Description

VIN

This is the positive input supply for the IC switching regulator. A suitable input bypass capacitor must be presented

at this pin to minimize voltage transients and to supply the switching currents needed by the regulator.

Ground

Circuit ground

SW Output

Internal switch. The voltage at this pin switches between (+Vcc – Vsat) and approximately – 0.5V, with a duty cycle

of approximately Vout / Vcc. To minimize coupling to sensitive circuitry, the PC board copper area connected to this

pin should be minimized.

Adjustable

Adjustment Input

Enable

Allows the switching regulator circuit to be shutdown using logic level signals thus dropping the total input supply

current to approximately 100uA. Pulling this pin below a threshold voltage of approximately 1.3V turns the regulator

on, and pulling this pin above 1.3V (up to a maximum of Vcc) shuts the regulator down. If this shutdown feature is

not needed, the EN pin can be wired to the ground pin.

Typical Application Circuit

1. Adjustable output voltage version

Resistor select for output voltage setting

Vout

R1

R2

5V

4.7K

1.5K

5.6K

1.8K

3.3V

2.5K

1.5K

3.0K

1.8K

2.5V

1.8K

1.8K

1.8V

0.82K

1.8K

Vout

2.5V

3.3V

5V

12V

120uH

120uH

120uH

NA

120uH

120uH

120uH

150uH