Summary description

L6725 - L6725A

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1

Summary description

The device is a flexible high performance PWM buck controller dedicated for low voltage

distributed DC-DC. The input voltage can range from 1.8V to 18V, while the supply voltage can

range from 4.5V to 18V. The output voltage is adjustable down to 0.6V.

High peak current gate drivers provide for fast switching to the external power section, and the

output current can be in excess of 20A. The device is capable to manage minimum on-times

switching frequency. In order to guarantee a real overcurrent protection, also with very narrow

necessary, two different current limit protections can be externally set through an external

resistor. The device can sink current after the soft-start phase while, during the soft-start, the

sink mode capability is disabled in order to allow a proper start-up also in pre-biased output

voltage conditions. Other features are over-voltage-protection and thermal shutdown.

1.1

Functional description

Figure 1.

Block diagram

Vin=1.8V-14V

Vcc=4.5V-14V

L6725

PGND

PHASE

GND

LGATE

BOOT

HGATE

OCH

FB

SS

Monitor

Protection and Ref

OSC

+

-

+

-

E/A

PWM

VCCDR

-

+

-

0.6V

OCL

COMP

EAREF

LDO

PGND

PHASE

GND

LGATE

BOOT

HGATE

OCH

V

OUT

FB

SS

Monitor

Protection and Ref

OSC

+

-

+

-

+

-

E/A

PWM

VCCDR

-

+

-

OCL

COMP

EAREF

LDO

PGOOD

SYNCH

Vcc = 14V - 18V

Vin = 14V - 18V