NCP1422: Boost Converter, Sync-Rect, PFM, DC-DC, 800 mA, with True-Cutoff and Ring-Killer
NCP1422 is a monolithic micropower high frequency step-up switching converter IC specifically designed for battery-operated hand-held electronic products up to 800mA loading. It integrates Sync-Rect to improve efficiency and to eliminate the external Schottky Diode. High switching frequency (up to 1.2 MHz) allows for a low profile, small-sized inductor and output capacitor to be used. When the device is disabled, the internal conduction path from LX or BAT to OUT is fully blocked and the OUT pin is isolated from the battery. This True-Cutoff function reduce the shutdown current to typically only 50nA. Ring-Killer is also integrated to eliminate the high-frequency ringing in discontinuous conduction mode. In addition to the above, Low-Battery Detector, Logic-Controlled Shutdown, Cycle-by-Cycle Current Limit and Thermal Shutdown provide value-added features for various battery-operated applications. With all these functions ON, the quiescent supply current is typical only 8.5 uA. This device is available in compact and low profile DFN10 package.
Features- Output Current up to 800 mA at VIN = 2.5 V and VOUT = 3.3 V
- High Switching Frequency, up to 1.2MHz
- Anti-Ringing Ring-Killer for Discontinuous Conduction Mode
- Low Quiescent Current of 8.5 µA
- 1.0V Startup at No Load Guaranteed
- Output Voltage from 1.5V to 5V Adjustable
- 1.5A Cycle by Cycle Current Limit
- On Chip Thermal Shutdown with Hysteresis
- Housed in Space-Saving and Low Profile DFN10 package
- Pb-Free Package is Available
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Applications- Personal Digital Assistants (PDA)
- Handheld Digital Audio Products
- Camcorders and Digital Still Cameras
- Conversion from one to two Alkaline, NiMH, NiCd battery cells to 3.0-5.0V or one Lithium-ion cells to 5.0V
- While LED Flash for Digital Cameras
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Application Notes (1)
Data Sheets (1)
Evaluation Board Documents (9)
Package Drawings (1)
Evaluation/Development Tool Information
| Product | Status | Compliance | Short Description |
|---|
| NCP1422GEVB | Active | Pb-free | Up to 800 mA DC-DC Converter Evaluation Board |
| NCP1422LEDGEVB | Active | Pb-free | High Current LED Driver Evaluation Board |
Order Information
| Product | Status | Compliance | Package | MSL* | Container | Budgetary Price/Unit |
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| NCP1422MNR2G | Active | Pb-free
Halide free | DFN-10 | 485C | 1 | Tape and Reel | 3000 | $0.7333 |
Specifications
| Product | Topology | Control Mode | VCC Min (V) | VCC Max (V) | VO Typ (V) | IO Typ (A) | Efficiency (%) | fSW Typ (kHz) |
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| NCP1422MNR2G | Step-Up | Current/Voltage Mode | 1 | 5.5 | 1.5 to 5.0 | 0.8 | Up to 94 | Up to 1200 |
