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| MITSUMI Sense Current Amplifier MM1380 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 150A typ. 50/100 times switching 0.5mV High/Low switching Package VSOP-8A Applications (1) Notebook PCs (2) PDA Pin Assignment 1 8 7 6 5 2 3 1 2 3 4 4 5 6 VSOP-8A 7 8 ISEL ININ+ GND COM OUT VCC GSEL MITSUMI Sense Current Amplifier MM1380 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 Internal equivalent circuit 2 3 ININ+ Inverted input terminal Non-Inverted input terminal 5 COM Reference voltage input terminal 6 7 OUT VCC Output terminal Supply voltage terminal 8 GSEL Gain selection switch terminal Voltage gain GSEL ="H" : Gv=100 GSEL ="L" : Gv=50 MITSUMI Sense Current Amplifier MM1380 Block Diagram Absolute Maximum Ratings Item Storage temperature Supply voltage Input terminal voltage Allowable loss Symbol TSTG VCCmax. VImax. Pd Ratings -40~+125 -0.3~+25 -0.3~+25 300 Units C V V mW Recommended Operating Conditions Item Operating temperature Operating voltage Symbol TOPR VCC Ratings -20~+85 +3~+24 Units C V MITSUMI Sense Current Amplifier MM1380 Electrical Characteristics (Except where otherwise indicated, Ta=25C, VCC=5V, Vicm=15V, Vcom=25V, Visel=5V, Vgsel=5V, RL=10k) Item Supply voltage range Supply current Voltage gain 1 ( 100) Voltage gain 2 ( 50) Input offset voltage 1 (High side) Input offset voltage 2 (Low side) Temperature coefficient of Voff 1 Temperature coefficient of Voff 2 Input common mode voltage range 1 (High side) Input common mode voltage range 2 (Low side) Input differential voltage Input bias current 1 (High side) Input bias current 2 (Low side) Input impedance COM terminal voltage range ISEL terminal current 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) Output voltage range Output source current Output sink current Cut off frequency 1 (GV1=100) Cut off frequency 2 (GV2=50) 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) Signal VCC ICC GV1 GV2 VOFF1 VOFF2 VOFF1 VOFF2 Vicm1 Vicm2 Vidf Ib1 Ib2 Zi Vcom Iisel Visel1 Visel2 Igsel Vgsel1 Vgsel2 VOUT Isrc Isnk FC1 FC2 PSRR1 PSRR2 CMRR1 CMRR2 RL : OPEN VOUT=VCC-0.3V VOUT=0.3V Vgsel=5V, VOUT=-3dB Vgsel=0V, VOUT=-3dB f=1kHz, Visel=5V f=1kHz, Visel=0V f=1kHz, Visel=5V f=1kHz, Visel=0V 70 70 70 70 Vgsel=5V 1.7 0 0.3 0.5 -0.5 1.0 -1.0 100 140 80 80 80 80 RL : OPEN Visel=5V 1.7 0 1.0 24 0.5 VCC-0.3 Visel=5V, Visel=0V, VIN=0V VIN=0V Measurement conditions Vcom=VCC/2 VIN=0V, RL : OPEN Vgsel=5V Vgsel=0V VIN=0V, Visel=5V VIN=0V, Visel=0V Visel=5V Visel=0V Visel=5V Visel=0V 97 48.5 -0.5 -0.5 -4 -6 1.8 -0.3 -200 0.8 -0.8 100 1.2 1.0 24 0.5 VCC-1.2 1.2 -1.2 Min. Typ. Max. Unit 3 150 100 50 24 200 103 0.5 0.5 4 6 24 VCC-2.4 200 1.6 -1.6 V A mV/mV mV mV V/C V/C V V mV A A k V A V V A V V V mA mA kHz kHz dB dB dB dB 51.5 mV/mV 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 MITSUMI Sense Current Amplifier MM1380 Application Circuit Battery current sensing circuit Charger current sensing circuit Characteristics Minimum output voltage-COM terminal voltage VOUT (min.) -Vcom 1.0 7. E-06 Input bias current-differential input voltage VOUT (min.) (V) IINBais (A) 1.5 2.0 2.5 0.8 0.6 0.4 0.2 0.0 0.0 R1=OPEN R1=20k R1=10k R1=5.1k 6. E-06 5. E-06 4. E-06 3. E-06 2. E-06 1. 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 Vcom (V) VINDiff (V) |
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