L6725 datasheet(6/27 Pages) STMICROELECTRONICS

6 / 27 page

Pin connections and functions

L6725

6/27

Pin connections and functions

Figure 2.

Pins connection (Top view)

Table 3.

Pin functions

Pin n.

Name

Function

SGND

All the internal references are referred to this pin.

This pin is connected to the error amplifier inverting input. Connect it to VOUT through

the compensation network. This pin is also used to sense the output voltage in order

to manage the over voltage protection.

1COMP

This pin is connected to the error amplifier output and is used to compensate the

voltage control feedback loop.

SS/INH

The soft-start time is programmed connecting an external capacitor from this pin to

GND. The internal current generator forces a current of 10

µA through the capacitor.

When the voltage at this pin is lower than 0.5V the device is disabled.

EAREF

By setting the voltage at this pin is possible to select the internal/external reference

and the switching frequency:

VEAREF 0-80% of VCCDR -> External Reference/FSW = 250KHz

VEAREF = 80% - 95% of VCCDR -> VREF = 0.6V/FSW = 500KHz

VEAREF = 95% - 100% of VCCDR ->VREF = 0.6V/FSW = 250KHz

An internal clamp limits the maximum VEAREF at 2.5V (typ.). The device captures the

analog value present at this pin at the start-up when VCC meets the UVLO threshold.

SO16N

EAREF

HGATE

OCL

SS/INH

COMP

OCH

N.C.

LGATE

PHASE

N.C.

SGND

VCC

VCCDR

BOOT

PGND

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