FP355KR-G1

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 VIN+ VINRS IS RG1 VIP LOAD RG2 VIN VIP 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: http://www.feeling-tech.com.tw Rev. 0.62 1/10 FP355 Function Block Diagram VIP VIN VCC OUT GND Pin Descriptions SOT23-5L Top View 1 GND 2 VIP 3 ZT915 OUT Name 5 4 VCC VIN No. I / O Description OUT 1 O Current Detect Output GND 2 P IC Ground VIP 3 I Positive Input of Differential OPA VIN 4 I Negative Input of Differential OPA VCC 5 P IC Power Supply 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: http://www.feeling-tech.com.tw Rev. 0.62 2/10 FP355 Marking Information SOT23-5L ZT915 Lot Number Year Part Number Code Lot Number: Wafer lot number’s last two digits For Example: 132386TB  86 Year: Production year’s last digit Part Number Code: Part number identification code for this product. It should be always “ZT”. 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: http://www.feeling-tech.com.tw Rev. 0.62 3/10 FP355 Ordering Information Part Number Operating Temperature Package MOQ Description -20°C ~ +125°C SOT23-5L 3000EA Tape & Reel FP355KR-G1 Absolute Maximum Ratings Parameter Symbol Conditions Min. Typ. Max. Unit Supply Voltage Vcc -0.3 12 V Common Mode Inputs Voltage Vi -0.3 12 V Differential Inputs Voltage (VIP – VIN) -12 1.5 V OUT Voltage -0.3 12 V Operating Temperature -20 +125 °C Storage Temperature -55 +150 °C +150 °C 220 mW Junction Temperature TJ Allowable Power Dissipation TA=25°C Junction to Ambient Thermal Resistance θJA +250 °C / W Junction to Case Thermal Resistance SOT25 Lead Temperature (soldering, 10 sec) θJC +150 °C / W +260 °C IR Re-flow Soldering Curve 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: http://www.feeling-tech.com.tw Rev. 0.62 4/10 FP355 Recommended Operating Conditions Parameter Symbol Supply Voltage Conditions Vcc Operating Temperature Min. Typ. Max. Unit 2.7 12 V -20 +125 °C Max. Unit 500 mV 12 V DC Electrical Characteristics + (VCC=5V, VIN =12V, ROUT=125KΩ, TA= -20°C~125°C, unless otherwise noted) Min. Typ. Parameter Symbol Conditions Full Scale Sense Voltage VSENSE Common-Mode Input Voltage + VSENSE=VIN －VIN VCM 100 2.7 + Common-Mode Rejection CMRR Input Offset Voltage vs temp VIN =2.7V to 12V, VSENSE=50mV 100 VOFFSET(TA) TMIN to TMAX 120 dB 4 μV / ℃ Input Bias Current IBIAS VCC=2.7V to 12V, VSENSE=50mV VIP,VIN Non-linearity Error NLE VSENSE=10mV to 150mV Total Output Error TOE VSENSE=100mV Output Impedance ROUT 1||5 GΩ||pF Voltage Swing to VCC VSCC VCC-0.8 V Voltage Swing to VCM VSCM VCM-0.5 V Bandwidth BW ROUT=125KΩ 32 kHz 5V Step, ROUT=125KΩ + VCC=VIN =12V, VSENSE=1V, RG1=RG2=1KΩ, RL=10KΩ BW=100KHz 30 μS Input Offset Voltage vs VCC VOFFSET(VCC) Settling Time Output Current Total Output-Current Noise Ts IOUT INOISE Operating Voltage Range VCC Quiescent Current ICC 2.5 μV/V μA 2 ±1 ±2 % % μA 350 3 2.7 VSENSE=0, Vcc=12V 10 nA 12 300 V μA 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: http://www.feeling-tech.com.tw Rev. 0.62 5/10 FP355 Typical Operating Characteristics (VCC=5V, VIN=12V, TA=25°C, unless otherwise noted) TOTAL OUTPUT ERROR VS Vsense VOLTAGE TOTAL OUTPUT ERROR (%) 4 VCC=5V，VIN=12V 2 25 C 0 85 C -2 -4 0 20 40 60 80 100 120 140 160 Vsense VOLTAGE (mV) 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: http://www.feeling-tech.com.tw Rev. 0.62 6/10 FP355 VOUT (RG1=RG2=1KΩ) G=1 G=10 G=1 G=25 VOUT (RG1=RG2=5KΩ) G=1 G=10 G=1 G=25 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: http://www.feeling-tech.com.tw Rev. 0.62 7/10 FP355 Function Description Figure 1 shows the FP355 basic application circuit, the load current (IS) flows from power supply + - and generates a voltage difference (VIN -VIN ) at the sense resistor (RS). Assume internal NPN transistor collector current is same as emitter current (I O) and VIP is very close VIN, the FP355 transfer function is:  IO  + VIN  VIN RG1  ----- (1) - In the circuit of Figure 1, the (VIN -VIN ), is equal to IS x RS and the output voltage (OUT) is equal to IO x RL. The final transfer function for rail current measurement in this application is: VOUT  G  IS  R S ----- (2) G  R L RG1 VIN+ ----- (3) VINRS IS RG1 V LOAD RG2 VIN IP VCC OUT GND RL IO Figure 1 Current Measurement Circuit Note: 1. The minimum operating voltages of VCC, VIP and VIN are 2.7V. If these supply voltages are lower than 2.7V, the transfer function at output of FP355 is no longer applicable. 2. Do not force a VIN voltage larger than VIP+15V. This condition would generate a leakage current and an incorrect voltage at FP355 output. 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: http://www.feeling-tech.com.tw Rev. 0.62 8/10 FP355 Figure 2 shows a simple method to delay the RS converting time. When a transient voltage happens at sense resistor (RS), the IC would RG1 change sourcing current (IO) to the output and RG2 generate a voltage change at the output. The RC 3 4 circuit will delay a time during output change. FP355 f-3dB 1 C R 1 f-3dB = 2 RC Figure 2 Output R-C Delay Circuit RS Figure 3 shows a detection circuit using 1.25V reference regulator and comparator. RG1 RG2 At VCC 4 3 initial, the non-inverting input of the comparator which is connected to the 1.25V FP355 R1 regulator is higher than inverting input. The 1 comparator’s output signal is high. Once the IC VOUT R output voltage is higher than 1.25V, the comparator’s output will change to low. VREF Figure 3 Comparator Detection Circuit 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: http://www.feeling-tech.com.tw Rev. 0.62 9/10 FP355 Package Outline SOT23-5L UNIT: mm Symbols Min. (mm) Max.(mm) A 1.050 1.350 A1 0.050 0.150 A2 1.000 1.200 b 0.250 0.500 c 0.080 0.200 D 2.700 3.000 E 2.600 3.000 E1 1.500 1.700 e 0.950 BSC e1 1.900 BSC L 0.300 0.550 L1 0.600 REF L2 0.250 BSC θ° 0° 10° θ1° 3° 7° θ2° 6° 10° Note: 1. Package dimensions are in compliance with JEDEC outline: MO-178 AA. 2. Dimension “D” does not include molding flash, protrusions or gate burrs. 3. Dimension “E1” does not include inter-lead flash or protrusions. 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: http://www.feeling-tech.com.tw Rev. 0.62 10/10