Sense Current Amplifier MM1380 MITSUMI Sense Current Amplifier Monolithic IC MM1380 Outline This IC improves on the previous sensor amp MM1089 (Dual). It is a single amp that allows current sensing regardless of the IC power supply (VCC). Further, the common mode signal rejection ratio and power supply fluctuation rejection ratio have been improved, and gain is switched between 50 and 100 times. Features (1) Common mode signal rejection ratio (CMRR1.1kHz) (2) Power supply fluctuation rejection ratio (PSRR1.1kHz) (3) Operating power supply voltage range (4) Consumption current (5) Voltage gain (6) Input equivalent offset voltage (7) Current detection (8) Single type 100dB typ. 80dB typ. +3 ~ +24V 150µA typ. 50/100 times switching ±0.5mV High/Low switching Package VSOP-8A Applications (1) Notebook PCs (2) PDA Pin Assignment 8 1 7 2 6 3 VSOP-8A 5 4 1 ISEL 2 IN- 3 IN+ 4 GND 5 COM 6 OUT 7 VCC 8 GSEL Sense Current Amplifier MM1380 MITSUMI Pin Description Pin No. Pin name 1 ISEL Functions Input selection switch terminal Input common mode voltage range ISEL ="H" : from 1.8V to 24V ISEL ="L" : from -0.3V to VCC-2.4V 4 GND Ground terminal 2 IN- Inverted input terminal 3 IN+ Non-Inverted input terminal 5 COM Reference voltage input terminal 6 OUT Output terminal 7 VCC Supply voltage terminal 8 GSEL Gain selection switch terminal Voltage gain GSEL ="H" : Gv=100 GSEL ="L" : Gv=50 Internal equivalent circuit Sense Current Amplifier MM1380 MITSUMI Block Diagram Absolute Maximum Ratings Item Symbol Ratings Units Storage temperature TSTG -40~+125 °C Supply voltage VCCmax. -0.3~+25 V Input terminal voltage VImax. -0.3~+25 V Allowable loss Pd 300 mW Recommended Operating Conditions Item Symbol Ratings Units Operating temperature TOPR -20~+85 °C Operating voltage VCC +3~+24 V Sense Current Amplifier MM1380 MITSUMI Electrical Characteristics (Except where otherwise indicated, Ta=25°C, VCC=5V, Vicm=15V, Vcom=25V, Visel=5V, Vgsel=5V, RL=10kΩ) Item Signal Measurement conditions Min. Typ. Max. Unit Supply voltage range VCC Vcom=VCC/2 Supply current ICC Voltage gain 1 ( 100) GV1 Vgsel=5V Voltage gain 2 ( 50) GV2 Vgsel=0V Input offset voltage 1 (High side) VOFF1 VIN=0V, Visel=5V -0.5 0.5 mV Input offset voltage 2 (Low side) VOFF2 VIN=0V, Visel=0V -0.5 0.5 mV 3 24 V 150 200 µA 97 100 103 mV/mV 48.5 50 51.5 mV/mV VIN=0V, RL : OPEN Temperature coefficient of Voff 1 VOFF1 Visel=5V -4 4 µV/°C Temperature coefficient of Voff 2 VOFF2 Visel=0V -6 6 µV/°C Vicm1 Visel=5V 1.8 24 V Vicm2 Visel=0V -0.3 VCC-2.4 V -200 200 mV Input common mode voltage range 1 (High side) Input common mode voltage range 2 (Low side) Input differential voltage Vidf Input bias current 1 (High side) Ib1 Visel=5V, VIN=0V 0.8 1.2 1.6 µA Input bias current 2 (Low side) Ib2 Visel=0V, VIN=0V -0.8 -1.2 -1.6 µA Input impedance Zi COM terminal voltage range Vcom RL : OPEN ISEL terminal current Iisel Visel=5V ISEL terminal voltage range 1 (High side) ISEL terminal voltage range 2 (Low side) GSEL terminal sink current GSEL terminal voltage range 1 ( 100) GSEL terminal voltage range 2 ( 50) 100 kΩ 1.2 VCC-1.2 1.0 V µA Visel1 1.7 24 V Visel2 0 0.5 V Igsel Vgsel=5V 1.0 µA Vgsel1 1.7 24 V Vgsel2 0 0.5 V VCC-0.3 V Output voltage range VOUT RL : OPEN 0.3 Output source current Isrc VOUT=VCC-0.3V 0.5 1.0 mA Output sink current Isnk VOUT=0.3V -0.5 -1.0 mA Cut off frequency 1 (GV1=100) FC1 Vgsel=5V, VOUT=-3dB 100 kHz Cut off frequency 2 (GV2=50) FC2 Vgsel=0V, VOUT=-3dB 140 kHz PSRR1 f=1kHz, Visel=5V 70 80 dB PSRR2 f=1kHz, Visel=0V 70 80 dB CMRR1 f=1kHz, Visel=5V 70 80 dB CMRR2 f=1kHz, Visel=0V 70 80 dB Supply voltage rejection ratio 1 (High side) Supply voltage rejection ratio 2 (Low side) Common mode rejection ratio 1 (High side) Common mode rejection ratio 2 (Low side) MITSUMI Sense Current Amplifier MM1380 Measuring Circuit Supply voltage range Supply current Voltage gain Offset voltage Input common mode voltage range Input bias current COM terminal voltage range Output voltage range MITSUMI Sense Current Amplifier MM1380 Output source current Output sink current Cut off frequency Supply voltage rejection ratio Common mode rejection ratio ISEL terminal sink current GSEL terminal sink current Sense Current Amplifier MM1380 MITSUMI Application Circuit Battery current sensing circuit Charger current sensing circuit Characteristics Minimum output voltage-COM terminal voltage Input bias current-differential input voltage VOUT (min.) -Vcom 7. E-06 0.8 0.6 R1=OPEN R1=20k R1=10k R1=5.1k 6. E-06 IINBais (A) VOUT (min.) (V) 1.0 0.4 4. E-06 3. E-06 2. E-06 1. E-06 0.2 0.0 0.0 5. E-06 0. E+00 -0.25-0.20-0.15-0.10-0.05 0.00 0.05 0.10 0.15 0.20 0.25 0.5 1.0 1.5 Vcom (V) 2.0 2.5 VINDiff (V)