STEVAL-ISA044V6: 3.3V @ 3A, 2.5 ~ 18V, DFN

Summary

The STEVAL-ISA044V6 demonstration board is based on the ST1S10 device assembled in a DFN package. The ST1S10 is a step-down DC-DC converter with the inhibit function optimized for powering high voltages in LCD applications and low voltages in digital-core HDD applications.

It provides up to 3 A over an input voltage range of 2.5 V to 18.0 V, and synchronous rectification removes the need for an external Schottky diode. A high internal switching frequency (900 kHz) allows for the use of tiny surface-mount components, as well as a resistor divider to set the output voltage value. Only an inductor and 3 capacitors are required.

The current-mode PWM architecture and stable operation with low-ESR SMD ceramic capacitors result in low output ripple. To maximize power conversion efficiency in light load, the regulator can work in burst mode automatically. The device can operate in PWM mode with a fixed frequency or synchronized to an external frequency. It switches at a frequency of 900 kHz when the SYNC pin is connected to ground or a fixed voltage (less than 5.5 V), and can synchronize the switching frequency between 400 kHz to 1.2 MHz from an external clock applied to the SYNC pin.

A thermal shutdown circuit is integrated and activates at 150 °C. Cycle-by-cycle current limitation provides protection against shorted outputs. The quiescent current is less than 6 μA in the inhibit state.

Specifications

Manufacturer STMicroelectronics
Category AC/DC and DC/DC Conversion
Sub-Category DC/DC SMPS - Single Output
Eval Board Part Number 497-11283-ND
Eval Board Supplier STMicroelectronics
Eval Board Normally In Stock
Topology Step Down
Outputs and Type 1 Non-Isolated
Voltage Out: Factory Set 3.3 V
Current Out 3 A
Voltage In 2.5 ~ 18 V
Efficiency @ Conditions >95%, 16V in, 12V @ 0.4 ~ 3 A
>91%, 12V in, 5V @ 0.3 ~ 3 A
>90%, 5V in, 3.3V @ 0.1 ~ 2.6 A
Voltage Out Range 0.8 ~ 12 V
Features Light Load Mode
Over Current Protection
Short Circuit Protection
Shutdown, Enable, Standby
Soft Start
Synchronizable
Thermal Protection
Switching Frequency 900 kHz
Standby Current [Typical] 2 µA
Quiescent Current [Typical] 1.5 mA
Component Count + Extras 8 + 5
Internal Switch Yes
Design Author STMicroelectronics
Application / Target Market Automotive
Battery Chargers
Computers
DVD/Blu-ray Players
FPGA / DSP / Processors
LCD TV / Monitor
Point of Load (PoL)
Set-Top Boxes
Standby Current [Maximum] 6 µA
Quiescent Current [Maximum] 2.5 mA
Main I.C. Base Part ST1S10
Date Created By Author 2011-10
Date Added To Library 2012-07

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