NCP1421:600 mA, 1.2 MHz Adjustable Sync-Rect PFM Boost Converter with True-Cutoff and Ring-Killer
NCP1421 is a monolithic micropower high-frequency step-up switching converter IC specially designed for battery- operated hand-held electronic products up to 600 mA 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 reduces 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 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 typically only 8.5 5A. This device is available in the compact and low Micro8 package.
技术特性
- High Efficiency:
94% for 3.3 V Output at 200 mA from 2.0 V Input
84% for 3.3 V Output at 500 mA from 2.5 V Input
- High Switching Frequency, up to 1.2 MHz (Not Hitting Current Limit)
- True-Cutoff Function Reduces Device Shutdown Current to typically 50nA
- Anti-Ringing Ring-Killer for Discontinuous Conduction Mode
- High Accuracy Reference Output, 1.2V 1 1.5%,
can supply 2.5mA Loading Current when VOUT > 3.3V
- Low Quiescent Current of 8.5 µA
- Integrated Low-Battery Detector
- Open Drain Low -Battery Detector Output
- 1.0V Startup at No Load Guaranteed
- Output Voltage from 1.5V to 5.0V Adjustable
- 1.5 A Cycle-by-Cycle Current Limit
- Multi-function Logic Controlled Shutdown Pin
- On Chip Thermal Shutdown with Hysteresis
- Output Current up to 600mA at VIN=2.5V and VOUT=3.3V
- Pb-Free Package is Available
- Housed in Space Saving and Low Profile Micro8 package
|
应用
- Personal Digital Assistants (PDA)
- Handheld Digital Audio Products
- Camcorders and Digital Still Cameras
- Handheld Instruments
- Conversion from one to two Alkaline, NiMH, NICd Battery Cells to 3.0-5.0V or one Lithium-ion cell to 5.0V
封装图 PACKAGE DIMENSIONS
|
评估板信息
| 评估板 |
状况 |
无铅(Pb-free) |
简短说明 |
| NCP1421EVB |
Active |
|
NCP1421 Up to 600 mA DC-DC Converter Evaluation Board |
| NCP1421LEDGEVB |
Active |
 |
EVB FOR NCP1421LED |
订购信息 Ordering Information
| 产品 |
状况 |
Compliance |
具体说明 |
封装 |
MSL* |
容器 |
预算价格 (1千个数量的单价） |
| 类型 |
外形 |
类型 |
数量 |
| NCP1421DMR2G |
Active |
|
600 mA, 1.2 MHz Adjustable Sync-Rect PFM Boost Converter with True-Cutoff and Ring-Killer |
Micro8™-8 |
846A-02 |
1 |
Tape and Reel |
4000 |
$0.6 |
| NCP1421DMR2 |
Last Shipments |
|
600 mA, 1.2 MHz Adjustable Sync-Rect PFM Boost Converter with True-Cutoff and Ring-Killer |
Micro8™-8 |
846A-02 |
1 |
Tape and Reel |
4000 |
|
数据资料DataSheet下载
