L7981 3 A step-down switching regulator

The L7981 is a step down switching regulator with 3.7 A (minimum) current limited embedded power MOSFET, so it si able to deliver up to 3 A current to the load depending on the application conditions.

The input voltage can range from 4.5 V to 28 V, while the output voltage can be set starting from 0.6 V to VIN.

Requiring a minimum set of external components, the device includes an internal 250 kHz switching frequency oscillator that can be externally adjusted up to 1 MHz.

The QFN and the HSOP packages with exposed pad allow reducing the RthJA down to 60°C/W and 40°C/W respectively

技术特性

3 A DC output current
4.5 V to 28 V input voltage
Output voltage adjustable from 0.6 V
250 kHz switching frequency, programmable up to 1 MHz
Internal soft-start and enable
Low dropout operation: 100% duty cycle
Voltage feed-forward
Zero load current operation
Overcurrent and thermal protection
VFQFPN3x3-8L and HSOP8 package

功能框图

L7981 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
L7981A	Active		1000	PowerSO-8	Tube
L7981ATR	Active		1000	PowerSO-8	Tape And Reel
L7981TR	Active		1000	VDFPN 8 3x3x1.0	Tape And Reel
L7981	Active		1000	VDFPN 8 3x3x1.0	Tube

DATASHEET

描述	版本	大小
L7981 : 3 A step-down switching regulator	3	1316KB

DESIGN NOTES

描述	版本	大小
DN0011: ST1S03 alternative topology: Using a buck in a negative buck-boost configuration	1.0	360KB