L4978 2A Step down switching regulator
The L4978 is a step down monolithic power switching regulator delivering 2A at a voltage between 3.3V and 50V (selected by a simple external divider). Realized in BCD mixed technology, the device uses an internal power D-MOS transistor (with a typical Rdson of 0.25Ω) to obtain very high efficency and high switching speed.
A switching frequency up to 300KHz is achievable (the maximum power dissipation of the packages must be observed). A wide input voltage range between 8V to 55V and output voltages regulated from 3.3V to 50V cover the majority of today’s applications. Features of this new generations of DC-DC converter include pulse-by-pulse current limit, hiccup mode for short circuit protection, voltage feedforward regulation, soft-start, protection against feedback loop disconnection, inhibit for zero current consumption and thermal shutdown.
The device is available in plastic dual in line, DIP-8 for standard assembly, and SO16W for SMD assembly
技术特性
- UP TO 2A STEP DOWN CONVERTER
- OPERATING INPUT VOLTAGE FROM 8V TO 55V
- PRECISE 3.3V (±1%) INTERNAL REFERENCE VOLTAGE
- OUTPUT VOLTAGE ADJUSTABLE FROM 3.3V TO 50V
- SWITCHING FREQUENCY ADJUSTABLE UP TO 300KHz
- VOLTAGE FEEDFORWARD
- ZERO LOAD CURRENT OPERATION
- INTERNAL CURRENT LIMITING (PULSE-BYPULSE AND HICCUP MODE)
- INHIBIT FOR ZERO CURRENT CONSUMPTION
- PROTECTION AGAINST FEEDBACK DISCONNECTION
- THERMAL SHUTDOWN
- SOFT START FUNCTION
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功能框图
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L4978 订购信息
| 订购型号 |
产品状态 |
美金价格 |
数量 |
封装 |
包装形式 |
温度范围 |
材料声明 |
| L4978D013TR |
Active |
|
1000 |
SO-16W |
Tape And Reel |
|
|
| L4978 |
Active |
|
1000 |
DIP-8 |
Tube |
|
|
| L4978D |
Active |
|
1000 |
SO-16W |
Tube |
|
|
DATASHEET
| 描述 |
版本 |
大小 |
| L4978 : DS1309: 2A step down switching regulator |
9 |
579KB |
APPLICATION NOTES
| 描述 |
版本 |
大小 |
| AN1061: Designing with L4978, 2A high efficiency DC-DC convertery |
9 |
794KB |
DESIGN NOTES
| 描述 |
版本 |
大小 |
| DN0011: ST1S03 alternative topology: Using a buck in a negative buck-boost configuration |
1.0 |
360KB |
USER MANUALS
| 描述 |
版本 |
大小 |
| UM0581: STEVAL-PCC005V1, STR912FAW44 parallel interface to hard disk demonstration board |
1 |
1146KB |
SCHEMATIC PACKS
| 描述 |
版本 |
大小 |
| Board Schematic |
1.0 |
8KB |
