LM1770 #3: 2.5V @ 3A, 5V in, (Page 7)
Summary
The controller utilizes a constant on-time control scheme which eliminates the need for external compensation components, allowing the power supply designer to minimize necessary board space and reduce costs.
The use of a small valued inductor (1.5 µH) is made possible by the high frequency operation. A 68 µF, low profile, POSCAP output capacitor is used, along with a 10 nF ceramic feed-forward capacitor, to ensure stability. The 500 ns LM1770 timing option allows for the 1.5 MHz switching frequency.
The use of a small valued inductor (1.5 µH) is made possible by the high frequency operation. A 68 µF, low profile, POSCAP output capacitor is used, along with a 10 nF ceramic feed-forward capacitor, to ensure stability. The 500 ns LM1770 timing option allows for the 1.5 MHz switching frequency.
Specifications
| Manufacturer | Texas Instruments |
|---|---|
| Category | AC/DC and DC/DC Conversion |
| Sub-Category | DC/DC SMPS - Single Output |
| Eval Board |
Board not Stocked
|
| Topology |
Step Down
|
| Outputs and Type |
1 Non-Isolated
|
| Voltage Out: Factory Set |
2.5 V
|
| Current Out |
3 A
|
| Voltage In |
5 V
|
| Efficiency @ Conditions |
>84%, 5V in, 2.5V @ 0.8 ~ 3 A
|
| Voltage Out Range | |
| Features |
Short Circuit Protection
Soft Start |
| Switching Frequency |
1.5 MHz
|
| Standby Current [Typical] | |
| Quiescent Current [Typical] |
400 µA
|
| Component Count + Extras |
9 + 0
|
| Internal Switch |
No
|
| Design Author |
Texas Instruments
|
| Application / Target Market |
Computers
DVD/Blu-ray Players Point of Load (PoL) Portable Devices Set-Top Boxes Telecom USB Powered Devices White Goods |
| Standby Current [Maximum] | |
| Quiescent Current [Maximum] |
600 µA
|
| Main I.C. Base Part |
LM1770S
|
| Date Created By Author | |
| Date Added To Library | 2020-05 |
Support Documents & Media
Media
