ELM614MB
18V 720kHz 2A Fast-PWM synchronous step-down converter
ELM614MB is a fully integrated high efficiency synchronous step-down converter which requires minimum number of external components. It offers very compact solution with up to 2A continuous output current over a wide input range. ELM614MB employs prorietary Constant On-Time (COT) control scheme providing superior transient response and maintaining conatant switching frequency under the continuous conduction mode operation. The external ramp compensation network allows stable operation with ultra-low equivalent series resistance (ESR) output ceramic capacitors. An internal compensated error amplifier in the control loop provides excellent line and load regulation. ELM614MB integrates extensive protection functions include: NVLO, OCP, UVP and therrnal shutdown. The converter is available in a small 6 pin SOT-563.
| Stable operation with low ESR ceramic output capacitors | |
|---|---|
| Fast PWM COT control with superior transient performance and stable switching frequency | |
| Accurate EN UVLO threshold | |
| High Efficiency Operation at light load | |
| Thermal Shutdown with Auto recovery | |
| Hiccup mode short circuit protection | |
| Input voltage range | 4.5V to 18V |
| Output voltage range | 0.804V to 18V |
| Continuous output current | 2A |
| Duty cycle low dropout operation | 100% |
| Switching frequency | 720kHz |
| Internal soft start | 1.6ms |
| Integrated HS/LS power switches | 60mΩ/37mΩ |
| Package | SOT-563 (Show datasheet) |
| Datasheet | ELM614MB |
- Application
- Laptop computer
- Tablet PC
- Networking systems
- Personal video recorders
- Flat panel television and monitors
- Distributed power systems
Recommend Operating Conditions
| Parameter | Symbol | Limit | Unit |
|---|---|---|---|
| Input voltage | Vin | +4.5 to +18.0 | V |
| Operating temperature range | Top | -40 to +85 | °C |
| Junction temperature range | Tj | -40 to +125 | °C |
Absolute Maximum Ratings
| Parameter | Symbol | Limit | Unit |
|---|---|---|---|
| Supply voltage | Vin | +19 | V |
| EN voltage | Ven | +19 | V |
| SW voltage | Vsw | Vsw-0.3 to Vin+0.3 | V |
| Dynamic VSW in 10ns duration | Vdsw | -3 to Vin+3.0 | V |
| BS-SW voltage | Vbs-sw | +6 | V |
| FB voltage | Vfb | +6 | V |
| Power dissipation | Pd | 1.5 | W |
| Junction temperature range | Tj | -40 to +150 | °C |
| Storage temperature range | Tstg | -65 to +150 | °C |
| Lead temperature (Soldering 10s) | +260 | °C | |
| Thermal resistance | θja θjc | 83 31 | °C/W |
Block diagram
