DC2000A: 1V @ 30A + 1.5V @ 30A, 4.5 ~ 14V in, Buck
Summary
Demonstration circuit 2000A is a high efficiency, high density, synchronous buck converter with a 4.5V to 14V input range. It can supply 30A maximum load current at a 1.0V output and at a 1.5V output separately. The demo board includes a LTC®3875EUJ controller. The LTC3875 is a feature-rich dual phase synchronous buck controller with very low DCR current sensing capability, on-chip drivers and remote output voltage sensing.
This board is set up with a 0.32mΩ DCR inductor. The temperature compensation function can guarantee accurate current limit over a wide temperature range with DCR sensing.
The LTC3875 is suitable for inputs from 4.5V to 38V and outputs up to 3.5V. It can provide a high efficiency, high power density and versatile power solution for telecom and datacom systems, industrial and medical instruments, DC power distribution systems and computer systems.
The LTC3875 is available in a 40-pin 6mm × 6mm QFN package.To shut down the converter, set the RUN1/RUN2 pin voltage below 1.2V (SW1: OFF; SW2: OFF). Use the JP1 jumper to select burst mode, pulse-skipping mode or forced continuous mode operation at light load. Switching frequency is pre-set at about 400kHz, and it can be easily modified from 250kHz to 770kHz. An on-board dynamic circuit is also available for the transient test. Please see the LTC3875 data sheet for more detailed information.
Specifications
| Manufacturer | Analog Devices Inc. |
|---|---|
| Category | AC/DC and DC/DC Conversion |
| Sub-Category | DC/DC SMPS - Multi Output |
| Eval Board Part Number | DC2000A-ND |
| Eval Board Supplier | Analog Devices Inc. |
| Eval Board |
Normally In Stock
|
| Topology |
Step Down
|
| Outputs and Type |
2 Non-Isolated
|
| Voltage Out: Highest Current First |
1V, 1.5V
|
| Current Out |
30A per Channel
|
| Voltage In |
4.5 ~ 14 V
|
| Efficiency @ Conditions |
>90%, 4.5V in, 1V @ 2 ~ 14 A
>90%, 4.5V in, 1.5V @ 1.5 ~ 19 A >90%, 12V in, 1.5V @ 5 ~ 28 A >85%, 12V in, 1V @ 4 ~ 30 A |
| Voltage Out Range |
0.6 ~ 5 V
|
| Features |
Current Foldback Protection
Current Limit (Adj. or Fixed) Over Voltage Protection Power Good Output Short Circuit Protection Shutdown, Enable, Standby Soft Start Voltage Tracking |
| Switching Frequency |
250 ~ 720 kHz
|
| Standby Current [Typical] |
40 µA
|
| Quiescent Current [Typical] |
7 mA
|
| Component Count + Extras |
87 + 34
|
| Internal Switch |
No
|
| Design Author |
Linear Technology
|
| Application / Target Market |
Power: Auxiliary Power Supply
Servers Telecom |
| Standby Current [Maximum] |
60 µA
|
| Quiescent Current [Maximum] |
10 mA
|
| Main I.C. Base Part |
LTC3875
|
| Date Created By Author | 2013-10 |
| Date Added To Library | 2017-02 |
