| Manufacturer | Linear Technology | National Semiconductor | Maxim | Zetex | On Semiconductor | |
| Part No. | LT3474 | LM3402 LM3404 | LM3406HV | MAX16819 | ZXLD1350 | NCP3066 |
| Vin(V)min. | 4 | 6 | 6 | 4.5 | 7 | 3 |
| Vin(V)Max. | 36 | 42 | 75 | 28 | 30 | 40 |
| Switch Integrated | Yes | Yes | Yes | No | Yes | Yes |
| Iout(A)max. | 1 | 0.5/1.0/1.5 | 0.5/1.0/1.5 | 3 | 0.35 | 1.5 |
| Operate Frequency(MHz) | 2 | 1 | 1 | 2 | 1 | 0.25 |
| Peak Efficiency | 92% | 95% | 95% | 97% | 95% | 93% |
| Topology | Buck | Buck | Buck | Buck | Buck | Buck/BOOST |
| Quiescent Current | 4mA | N/A | N/A | 1.5mA | 0.5mA | 7mA |
| Shutdown Current | 2uA | N/A | N/A | 425uA | 20uA | 120uA |
| Dimming | 400:1 | Yes | Yes | Yes | Yes | Yes |
| Dimming Interface | PWM | PWM | PWM | PWM | PWM | PWM |
| Open LED Protection | Yes | Yes | Yes | No | Yes | No |
| Soft-Start | No | No | No | No | Yes | No |
| Short-Circuit Protection | Yes | No | No | Yes | Yes | Yes |
| Thermal Overload Protection | Yes | Yes | Yes | No | No | Yes |
| Over Voltage Protection | No | Yes | Yes | No | No | No |
| Ambient Temp(0C) | –40°C to 125°C | –40°C to 125°C | –40°C to 125°C | –40°C to 125°C | -40 to 105°C | –40°C to 85°C |
| Package | TSSOP-16 | MSOP-8 PSOP-8 | MSOP-8 PSOP-8 | TDFN-6 | TSOT23-5 | QFN-8 SOIC-8 DIP-8 |
| Comparison conclusion: 1.Currently the power of LEDs for lighting include 1 W, 3 W and 5 W, the current specifications is respectively 0.35 A, 1 A, 1.5 A. Power LED will produce a great deal of heat, leading to the need for higher efficiency of driving circuit, as a result Buck become the mainstream application. 2.Wide voltage input is a relatively important feature, because it can configure the number of LED driver with flexibility, keep minimum difference between input and output voltages, helpful to improving efficiency. 3.Because of the enormous volume of the LED lighting and the need for the reliabillity, the cost, operating temperature and various protection funtions are important. Customers need to select based on their project requirements. |