ELM613xDC
4A 30V 500kHz synchronous step-down DC/DC converter
ELM613xDC 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 4A continuous output current over a wide input range.
ELM613xDC employs proprietary Constant On-Time (COT) control scheme providing superior transient response and maintaining constant switching frequency under the continuous conduction mode operation.
The internal ramp compensation network allows stable operation with ultra-low equivalent series resistance (ESR) output ceramic capacitors without using external compensation network. An error amplifier in the control loop provides excellent line and load regulation.
ELM613xDC integrates extensive protection functions include: UVLO, OCP and thermal shutdown. Input under- voltage lockout is internally set as 3.8V.
The unique ultrasonic pulse-skipping mode (ELM613UDC) maintains the switching frequency above 25kHz, which eliminates noise in audio applications. Other features include pulse skipping mode (ELM613NDC), which maximizes efficiency in light-load applications,
and forced PWM mode(ELM613ADC) which operates in constant frequency PWM mode regardless of load current.
| Stable operation with output low ESR ceramic capacitors | |
|---|---|
| Externally adjustable built-in soft start (Typ.2ms) | |
| Fast PWM Constant On Time (COT) control scheme with superior transient performance | |
| Accurate EN threshold for the external programmable Vin UVLO | |
| Low quiescent current | |
| Thermal shutdown with auto recovery | |
| Hiccup mode 8 times then latch-off over current protection | |
| Input voltage range | 4.0V to 30.0V |
| Feedback voltage accuracy | 0.8V±2% |
| Continuous output current | Max.4A(5A Peak) |
| Duty cycle (low dropout operation) | Max.100% |
| Switching frequency | Typ.500kHz |
| 2 Types of light load mode and a forced PWM mode control schemes | ELM613UDC: Ultrasonic pulse skip mode (25kHz min) ELM613NDC: Pulse skip mode ELM613ADC: Forced PWM mode |
| Integrated high side and low side switches | 40mΩ/40mΩ |
| Package | SOP-8 (with Exposed Pad) Show datasheet |
| Datasheet | ELM613xDC |
- 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 |
|---|---|---|---|
| Supply voltage | Vin | +4.0 to +30.0 | V |
| Output voltage | Vout | 0.8 to Vin | V |
| Operating temperature | Top | -40 to +125 | °C |
Absolute Maximum Ratings
| Parameter | Symbol | Limit | Unit |
|---|---|---|---|
| VIN supply voltage | Vin | +36 | V |
| EN to GND | Ven | +36 | V |
| SW to GND | Vsw | -0.3 to Vin+0.3 | V |
| PGND to GND | Vpgnd | -0.3 to +0.3 | V |
| BST to SW | Vbst | -0.3 to +6.0 | V |
| All other pins to GND | Vall | -0.3 to +6.0 | V |
| Junction temperature | Tj | +150 | °C |
| Thermal resistance | θja | 51 | °C/W |
| Power dissipation | Pd | 2.45 | W |
| Storage temperature range | Tstg | -65 to +150 | °C |
Block diagram
