Summary
Demonstration circuit DC1663A features the LTM4628EV, the high efficiency, high density, dual 8A output, switch mode step-down power module. The input voltage is from 4.5V to 26.5V. The output voltage is programmable from 0.6V to 5.5V. Output current derating is necessary for certain VIN, VOUT, and thermal conditions.
The board operates in continuous conduction mode in heavy load conditions. For high efficiency at low load currents, the MODE jumper (JP1) selects pulse-skipping mode for noise sensitive applications or Burst Mode® operation in less noise sensitive applications. The DC1663A sets the LTM4628EV default switching frequency to 400kHz; however the frequency is resistor programmable from 250kHz up to 780kHz. An internal phase-lock loop allows the module to be synchronized to an external clock.
The board allows the user to program how its output ramps up and down through the TRACK/SS pin. The output can be set up to either coincidentally or ratio metrically track with another supply’s output. Remote output voltage sensing is available for improved output voltage regulation at the load point.
Specifications
| Manufacturer | Analog Devices Inc. |
|---|---|
| Category | AC/DC and DC/DC Conversion |
| Sub-Category | DC/DC SMPS - Multi Output |
| Eval Board Part Number | DC1663A-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 |
1.2V, 1.5V
|
| Current Out |
8A per Channel
|
| Voltage In |
4.5 ~ 26.5 V
|
| Efficiency @ Conditions |
>87%, 12V in, 1.5V @ 4 ~ 8 A
>86%, 12V in, 1.2V @ 4 ~ 8 A |
| Voltage Out Range |
- Not Given
|
| Features |
Current Foldback Protection
Over Current Protection Over Voltage Protection Shutdown, Enable, Standby Soft Start Synchronizable Under Voltage Protection, Brown-Out Voltage Tracking |
| Switching Frequency |
400 kHz
|
| Standby Current [Typical] |
60 µA
|
| Quiescent Current [Typical] |
15 mA
|
| Component Count + Extras |
18 + 62
|
| Internal Switch |
Yes
|
| Design Author |
Linear Technology
|
| Application / Target Market |
Telecom
|
| Standby Current [Maximum] |
- Not Given
|
| Quiescent Current [Maximum] |
- Not Given
|
| Main I.C. Base Part |
LTM4628
|
| Date Created By Author | 2010-09 |
| Date Added To Library | 2012-12 |
