AN2115 datasheet(6/33 Pages) STMICROELECTRONICS

6 / 33 page

Device description

AN2115

6/33

Doc ID 11165 Rev 5

Device description

The L6928 is a high efficiency monolithic synchronous step-down regulator capable of

delivering up to 800 mA at output voltages from 0.6 V to Vin (100% duty cycle). It has been

designed using BCDV technology and employs a constant frequency peak current mode as

the control loop architecture. The input voltage ranges from 2 V to 5.5 V. Thanks to very low

quiescent current (25 µA) and shutdown current (0.2 µA), the device is highly suitable for

supplying battery-powered equipment (particularly for those using single lithium-ion cells)

such as PDAs and hand-held terminals, DSCs (digital still cameras) and cellular phones.

While the switching frequency is internally set at 1.4 MHz, the device can be externally

synchronized from 1 MHz to 2 MHz. If this feature is not required, it can operate in low

consumption mode (LCM) or low noise mode (LNM), depending on the SYNC pin value. A

very low internal reference voltage (0.6 V typ.) allows the device to regulate very low output

voltages, in accordance with new microprocessor supply voltage requirements. The very low

RDS(on) of the Power MOSFETs ensures high efficiency at high output current. Other

beneficial features are UVLO (undervoltage lockout), OVP (overvoltage protection), constant

current short circuit protection, Power Good (power good output) and thermal shutdown.

The space saving MSOP8 package, combined with a minimum need for external

components, allows for very compact applications.

Figure 2.

Minimum size application circuit

Figure 3.

Pin connection

Figure 4.

Package

RUN

COMP

VFB

GND

VCC

SYNC

PGOOD

D01IN1239AMOD

AN2115 Arkusz danych(PDF) 6 Page - STMicroelectronics