L6902 1A Switching Regulator
The L6902D is a complete and simple step down switching regulator with adjustable current limit.
Based on a voltage mode structure it integrates a current error amplifier to have a constant voltage and constant current control.
By means of an on board current sense resistor and the availability of the current sense pins (both compatible to Vcc and for Cs- compatible with GND too) a current limit programming is very simple and accurate (±5%). Moreover constant current control can be used to charge NiMH and NiCd batteries.
The device can be used as a standard DC/DC converter with adjustable current limit (set by using the external sense resistor).
The internal robust P-channel DMOS transistor with a typical of 250 mΩ assures high efficiency and a minimum dropout even at high output current level. The internal limiting current (latched function) of typical value of 2.5 A protects the device from accidental output short circuit avoiding dangerous loads damage.
If the temperature of the chip goes higher than a fixed internal threshold (150°C with 20°C hysteresis), the power stage is turned off.
Other protections beside thermal shutdown complete the device for a safe and reliable application: overvoltage protection, frequency folback overcurrent protection and protection vs. feedback disconnection.
The internal fixed switching frequency of 250KHz, and the SO-8 package pin allow to built an ultra compact DC/ DC converter with a minimum board space.
技术特性
|
功能框图 |
L6902 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 |
| L6902D013TR | Active | 1000 | SO-8 | Tape And Reel | |||
| L6902 | Active | 1000 | SO-8 | Tube |
DATASHEET
| 描述 | 版本 | 大小 |
| L6902 : Up to 1 A switching regulator with adjustable current limit | 9 | 198KB |
APPLICATION NOTES
| 描述 | 版本 | 大小 |
| AN1941: Low Voltage LED Driver Using L6920D, L4971 and L6902D | 1 | 500KB |
| AN2129: Dimming of super high brightness LEDs with L6902D | 2 | 358KB |
