A6902D(2007) Ver la hoja de datos (PDF) - STMicroelectronics

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A6902D
(Rev.:2007)

Up to 1A step down switching regulator with adjustable current limit for automotive applications

STMicroelectronics 

A6902D

1

Device summary

Device summary

The A6902D is a complete and simple step down switching regulator with adjustable current

limit. Based on a voltage mode structure it integrates a current error amplifier to have a

constant voltage and constant current control. By means of an on board current sense

resistor and the availability of the current sense pins (both compatible to Vcc and for Cs-

compatible with GND too) a current limit programming is very simple and accurate.

Moreover constant current control can be used to charge NiMH and NiCd batteries. The

device can be used as a standard DC/DC converter with adjustable current limit (set by

using the external sense resistor). The internal robust P-channel DMOS transistor with a

typical of 250mΩ assures high efficiency and a minimum dropout even at high output current

level. The internal limiting current (latched function) of typical value of 2.5A protects the

device from accidental output short circuit avoiding dangerous loads damage. If the

temperature of the chip goes higher than a fixed internal threshold (150°C with 20°C

hysteresis), the power stage is turned OFF.

Other protections beside thermal shutdown complete the device for a safe and reliable

application: overvoltage protection, frequency folback overcurrent protection and protection

vs. feedback disconnection. The internal fixed switching frequency of 250kHz, and the SO-8

package pin allow to built an ultra compact DC/ DC converter with a minimum board space.

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