STEVAL-ISA055V1: 1.2V @ 700mA, 2.5 ~ 5.5V in
Summary
This demonstration board is based on the ST1S12 family of synchronous step-down DC-DC converters optimized for powering low-voltage digital cores in HDD (hard disk drive) applications and is generally used to replace high-current linear solutions when power dissipation may cause high heating of the application environment.
It provides up to 0.7 A over an input voltage range of 2.5 V to 5.5 V. A high switching frequency of 1.7 MHz allows the use of tiny surface-mount components. For the adjustable version, a resistor divider to set the output voltage value, an inductor, and two capacitors are required. Only an inductor and 2 capacitors are needed for the 1.2 V and 1.8 V fixed version. A low output ripple is guaranteed by the current mode PWM topology and by the use of low ESR surface-mount ceramic capacitors.
The ST1S12 device is thermal protected and current limited to prevent damage due to accidental short-circuit.
It provides up to 0.7 A over an input voltage range of 2.5 V to 5.5 V. A high switching frequency of 1.7 MHz allows the use of tiny surface-mount components. For the adjustable version, a resistor divider to set the output voltage value, an inductor, and two capacitors are required. Only an inductor and 2 capacitors are needed for the 1.2 V and 1.8 V fixed version. A low output ripple is guaranteed by the current mode PWM topology and by the use of low ESR surface-mount ceramic capacitors.
The ST1S12 device is thermal protected and current limited to prevent damage due to accidental short-circuit.
Specifications
| Manufacturer | STMicroelectronics |
|---|---|
| Category | AC/DC and DC/DC Conversion |
| Sub-Category | DC/DC SMPS - Single Output |
| Eval Board Part Number | 497-8219-ND |
| Eval Board Supplier | STMicroelectronics |
| Eval Board |
Normally In Stock
|
| Topology |
Step Down
|
| Outputs and Type |
1 Non-Isolated
|
| Voltage Out: Factory Set |
1.2 V
|
| Current Out |
700 mA
|
| Voltage In |
2.5 ~ 5.5 V
|
| Efficiency @ Conditions |
>77%, 3V in, 1.2V @ 0.05 ~ 700 mA
|
| Voltage Out Range |
0.6 ~ Vin
|
| Features |
Current Limit (Adj. or Fixed)
Over Current Protection Shutdown, Enable, Standby Soft Start Thermal Protection Under Voltage Protection, Brown-Out |
| Switching Frequency |
1.7 MHz
|
| Standby Current [Typical] |
1 µA
|
| Quiescent Current [Typical] |
500 µA
|
| Component Count + Extras |
6 + 2
|
| Internal Switch |
Yes
|
| Design Author |
STMicroelectronics
|
| Application / Target Market |
Computers
Point of Load (PoL) |
| Standby Current [Maximum] |
1 µA
|
| Quiescent Current [Maximum] |
600 mA
|
| Main I.C. Base Part |
ST1S12_ADJ
|
| Date Created By Author | |
| Date Added To Library | 2011-03 |
Eval Board
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