FP355 Rail Current Measurement IC General Description The FP355 is a wide common mode range high side rail current measurement IC. It is suitable for power systems like battery charger or switching power supply applications. It includes a differential input amplifier and an NPN transistor with emitter output. With three external resistors, the rail current signal can be easily converted into an amplified voltage signal at the IC output pin. Also, the gain can be adjusted by changing the three external resistors values. Features Independent Power Supply Voltage: 2.7 to 12V Wide Input Common-Mode Voltage: 2.7 to 12V Source Current Emitter Output Three Resistors Gain Set-up Wide Temperature Range: -20 to +125 Package: SOT23-5L Applications Battery Charger High Side Rail Current Detector SPS (Adaptor) Current Sense Networking System Typical Application Circuit V + V - IN IN RS IS LOAD RG1 RG2 V V IP IN V IP VCC OUT GND RL IO This datasheet contains new product information. Feeling Technology reserves the rights to modify the product specification without notice. No liability is assumed as a result of the use of this product. No rights under any patent accompany the sales of the product. Website: ZT915 FP355 Function Block Diagram V V IP IN V CC OUT GND Pin Descriptions SOT23-5L Top View Name No. I / O Description OUT 1 O Current Detect Output 1 5 OUT VCC GND 2 P IC Ground GND 2 VIP 3 I Positive Input of Differential OPA V 4 I Negative Input of Differential OPA IN V 3 4 IP V IN V 5 P IC Power Supply CC This datasheet contains new product information. Feeling Technology reserves the rights to modify the product specification without notice. No liability is assumed as a result of the use of this product. No rights under any patent accompany the sales of the product. Website: