Overview
The NCP1423DMR2G is a monolithic micropower high-frequency step-up switching converter IC designed by onsemi. It is specifically tailored for battery-operated handheld electronic products, offering high efficiency and compact design. The IC integrates a synchronous rectifier, eliminating the need for an external Schottky diode, and features a high switching frequency of up to 600 kHz. This allows for the use of low-profile inductors and output capacitors, making it ideal for space-constrained applications. The device also includes advanced features such as low-battery detection, cycle-by-cycle current limit, overvoltage protection, and thermal shutdown, ensuring reliable operation in various battery-operated devices.
Key Specifications
| Characteristic | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Operating Voltage (VIN) | 0.8 | - | VOUT | V |
| Output Voltage Range (VOUT) | 1.8 | - | 3.3 | V |
| Minimum Input Voltage for Startup (VIN_MIN) | 0.85 | 0.90 | - | V |
| Reference Voltage (VREF) | 1.177 | 1.195 | 1.213 | V |
| FB Input Threshold (VFB) | 0.489 | 0.500 | 0.512 | V |
| Internal NFET ON-Resistance (RDS(ON)_N) | 0.3 | 0.45 | - | Ω |
| Internal PFET ON-Resistance (RDS(ON)_P) | 0.6 | 0.8 | - | Ω |
| LX Switch Current Limit (ILIM) | 1.2 | - | - | A |
| Maximum Continuous Output Current (IOUT) | 100 | - | - | mA |
| Soft Start Time (TSS) | 2.0 | 8.0 | - | ms |
| EN Shutdown Threshold (VSHDN) | 0.34 | 0.50 | 0.68 | V |
| Thermal Shutdown Temperature (TSHDN) | - | - | 145 | °C |
| Thermal Shutdown Hysteresis (TSDHYS) | - | - | 30 | °C |
Key Features
- Synchronous Rectifier: Integrates a synchronous rectifier to improve efficiency and eliminate the need for an external Schottky diode.
- High Switching Frequency: Operates at a high switching frequency of up to 600 kHz, allowing for the use of low-profile inductors and output capacitors.
- True-Cutoff: Features a True-Cutoff function that isolates the output from the battery when the device is disabled, significantly reducing battery current consumption during shutdown.
- Low-Battery Detection: Includes a low-battery detection function with a comparator and adjustable threshold.
- Overvoltage Protection and Thermal Shutdown: Provides overvoltage protection and thermal shutdown to ensure reliable operation.
- Cycle-by-Cycle Current Limit: Offers cycle-by-cycle current limiting to protect against overcurrent conditions.
- Compact Package: Available in a compact Micro10 package, making it suitable for space-constrained applications.
Applications
- Wireless Optical Mouse: Ideal for powering wireless optical mice due to its high efficiency and low power consumption.
- Wireless Headsets: Suitable for wireless headsets and other audio devices that require efficient power conversion.
- Internet Audio Players: Used in internet audio players and other portable audio devices.
- Personal Digital Assistants (PDAs): Applicable in PDAs and other handheld computing devices.
- Hand-held Instruments: Suitable for various hand-held instruments and devices.
Q & A
- What is the operating voltage range of the NCP1423DMR2G?
The operating voltage range is from 0.8 V to VOUT (which can be up to 3.3 V).
- What is the maximum continuous output current of the NCP1423DMR2G?
The maximum continuous output current is 100 mA (up to 200 mA for short periods).
- What is the switching frequency of the NCP1423DMR2G?
The switching frequency can be up to 600 kHz.
- What is the purpose of the True-Cutoff function in the NCP1423DMR2G?
The True-Cutoff function isolates the output from the battery when the device is disabled, reducing battery current consumption during shutdown.
- How does the low-battery detection work in the NCP1423DMR2G?
The low-battery detection is performed by a comparator with a 15 mV hysteresis, using an external resistor divider network to set the detection threshold.
- What are the thermal shutdown and hysteresis temperatures for the NCP1423DMR2G?
The thermal shutdown temperature is 145°C, and the hysteresis is 30°C.
- What is the typical quiescent supply current of the NCP1423DMR2G?
The typical quiescent supply current is 9 μA.
- What package type is the NCP1423DMR2G available in?
The device is available in a compact Micro10 package.
- What are some typical applications of the NCP1423DMR2G?
Typical applications include wireless optical mice, wireless headsets, internet audio players, PDAs, and hand-held instruments.
- Is the NCP1423DMR2G RoHS compliant?
Yes, the NCP1423DMR2G is Pb-free and RoHS compliant).
