Datasheet MAX471 (Maxim) - 3

Precision, High-Side Current-Sense Amplifiers ABSOLUTE MAXIMUM RATINGS
Supply Voltage, RS+, RS-, VCC to GND..-0.3V, +40V Continuous Power Dissipation (TA = +70°C) RMS Current, RS+ to RS- (MAX471 only)..±3.3A MAX471 (Note 1): Peak Current, (RS+ to RS-) ..see Figure 5 Plastic DIP (derate 17.5mW/°C above +70°C) ..1.4W Differential Input Voltage, RG1 to RG2 (MAX472 only) ...±0.3V SO (derate 9.9mW/°C above +70°C) ...791mW Voltage at Any Pin Except SIGN MAX472 : MAX471 only ...-0.3V to (RS+ - 0.3V) Plastic DIP (derate 9.09mW/°C above +70°C) ..727mW MAX472 only ..-0.3V to (VCC + 0.3V) SO (derate 5.88mW/°C above +70°C) ...471mW Voltage at SIGN..-0.3V to +40V Operating Temperature Ranges Current into SHDN, GND, OUT, RG1, RG2, VCC..±50mA MAX47_C_A ..0°C to +70°C Current into SIGN...+10mA, -50mA MAX47_E_A ...-40°C to +85°C Junction Temperature Range ..-60°C to +150°C Storage Temperature Range ...-60°C to +160°C Lead Temperature (soldering, 10sec) ...+300°C
Note 1:
Due to special packaging considerations, MAX471 (DIP, SO) has a higher power dissipation rating than the MAX472. RS+ and RS- must be soldered to large copper traces to achieve this dissipation rating.
MAX471/MAX472
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS—MAX471
(RS+ = +3V to +36V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Supply Voltage VRS+ 3 36 V Supply Current IRS+ ILOAD = 0A, excludes ISIGN 50 113 µA Sense Current ILOAD ±3 ARMS Sense Resistor RSENSE 35 70 mΩ IOUT/ ILOAD = 1A, MAX471C 0.490 0.500 0.510 Current-Sense Ratio mA/A ILOAD RS+ = 10V MAX471E 0.4875 0.500 0.5125 ILOAD = 0A, MAX471C 2.5 No-Load OUT Error µA RS+ = 10V MAX471E 3.0 ILOAD = 30mA, MAX471C ±2.5 Low-Level OUT Error µA RS+ = 10V MAX471E ±3.0 Power-Supply Rejection Ratio PSRR 3V ≤ RS+ ≤ 36V, ILOAD = 1A 0.1 %/V MAX471C ±4.0 ±6.0 SIGN Threshold (ILOAD required mA to switch SIGN) MAX471E ±7.0 SIGN Output Leakage Current VSIGN = 36V 1.0 µA SIGN Sink Current IOL VSIGN = 0.3V 0.1 mA Shutdown Supply Current IRS+(SHDN) VSHDN = 2.4V; VCC = 3V to 20V 1.5 18.0 µA SHDN Input Low Voltage VIL 0.3 V SHDN Input Low Current IIL VSHDN = 0V 1.0 µA SHDN Input High Voltage VIH 2.4 V SHDN Input High Current IIH VSHDN = 2.4V 1.0 µA OUT Output Voltage Range VOUT 0 VRS+ - 1.5 V OUT Output Resistance ROUT ILOAD = 3.0A, VOUT = 0V to (VRS+ - 1.5V) 1 3 MΩ I OUT Rise, Fall Time t LOAD = 50mA to 3.0A, ROUT = 2kΩ, R, tF 4 µs COUT = 50pF, 10% to 90% OUT Settling Time to 1% I t LOAD = 100mA to 3.0A, ROUT = 2kΩ, 15 µs of Final Value s COUT = 50pF
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