MAX4373TESA+T Low-Cost Micropower High-Side Current-Sense Amplifier + Comparator + Reference ICs
electronics ic chip
,integrated circuit components
MAX4373TESA+T Low-Cost, Micropower, High-Side Current-Sense Amplifier + Comparator + Reference ICs
General Description
The MAX4373/MAX4374/MAX4375 low-cost, micropower, high-side current-sense supervisors contain a highside current-sense amplifier, bandgap reference, and comparator with latching output. They feature a voltage output that eliminates the need for gain-setting resistors, making them ideal for today’s notebook computers, cell phones, and other systems where battery/DC current monitoring is critical. High-side current monitoring is especially useful in battery-powered systems since it does not interfere with the ground path of the battery charger. The 0 to +28V input common-mode range is independent of the supply voltage, which ensures that the current-sense feedback remains viable even when connected to a battery pack in deep discharge. The comparator output of the MAX4373/MAX4374/ MAX4375 is latched to provide a turn-off flag that doesn’t oscillate. In addition, the MAX4374/MAX4375 contain a second comparator for use in window-detection functions. The MAX4373/MAX4374/MAX4375 are available in three different gain versions (T = +20V/V, F = +50V/V, H = +100V/V) and use an external sense resistor to set the sensitivity of the input voltage to the load current. These features offer a high level of integration, resulting in a simple and compact currentsense solution. The MAX4373/MAX4374/MAX4375 operate from a single +2.7V to +28V supply and consume 50µA. They are specified for the extended operating temperature range (-40°C to +85°C) and are available in 8-pin and 10-pin µMAX packages.
Applications
Notebook Computers
Portable/Battery-Powered Systems
Smart Battery Packs/Chargers
Cell Phones
Power-Management Systems
General-System/Board-Level Current Monitoring
Precision Current Sources
Features
Current-Sense Amplifier plus Internal Comparator and Bandgap Reference
50µA Supply Current
Single +2.7V to +28V Operating Supply
0.66% Full-Scale Accuracy
Internal Bandgap Reference
Latching Comparator Output
Three Gain Versions Available (+20V/V, +50V/V, +100V/V)
Wide 0 to +28V Common-Mode Range, Independent of Supply Voltage
Ordering Information
PART TEMP. RANGE PINPACKAGE GAIN (V/V) |
MAX4373TEUA -40°C to +85°C 8 µMAX +20 |
MAX4373TESA -40°C to +85°C 8 SO +20 |
MAX4373FEUA -40°C to +85°C 8 µMAX +50 |
MAX4373FESA -40°C to +85°C 8 SO +50 |
MAX4373HEUA -40°C to +85°C 8 µMAX +100 |
MAX4373HESA -40°C to +85°C 8 SO +100 |
ABSOLUTE MAXIMUM RATINGS
VCC, RS+, RS- to GND ...........................................-0.3V to +30V
OUT to GND ................................................-0.3V to the lesser of (VCC + 0.3V) or +15V
CIN1, CIN2, RESET to GND ........................-0.3V to the lesser of (VCC + 0.3V) or +12V
Differential Input Voltage (VRS+ - VRS-)..............................±0.3V
COUT1, COUT2 to GND........................................-0.3V to +6.0V
Current into Any Pin..........................................................±10mA
Continuous Power Dissipation (T A = +70°C)
8-Pin µMAX (derate 4.1mW/°C above +70°C) .............330mW
8-Pin SO (derate 5.9mW/°C above +70°C)..................471mW
10-Pin µMAX (derate 5.6mW/°C above +70°C) ...........444mW
14-Pin SO (derate 8.3mW/°C above +70°C)................667mW
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
ELECTRICAL CHARACTERISTICS
(VCC = +2.7V to +28V, VRS+ = 0 to +28V, VSENSE = 0, VRESET = 0, RLOAD= 1M Ω, T A = TMIN to TMAX, unless otherwise noted. Typical values are at T A = +25°C.) (Note 1)
PARAMETER | SYMBOL | CONDITIONS | MIN TYP MAX | UNITS | |
Operating Voltage Range | VCC | 2.7 28 | V | ||
Common-Mode Input Range | VCMR | 0 28 | V | ||
Common-Mode Rejection | CMR | VRS+ > 2V | 85 | dB | |
Supply Current | ICC | VRS+ > 2V, VSENSE = 5mV | 50 100 | µA | |
Leakage Current | IRS+, IRS | VCC = 0 | ±0.015 ±0.5 | µA | |
Input Bias Current | IRS+ | VRS+ > 2V | 0 2.5 | µA | |
VRS+ ≤ 2V | -25 2.0 | ||||
IRS- | VRS+ > 2V | 0 4 | |||
VRS+ ≤ 2V | -50 4 | ||||
Full-Scale Sense Voltage | VSENSE | Gain = +20V/V, +50V/V | 150 170 | mV | |
Gain = +100V/V | 100 120 | ||||
Full-Scale Accuracy |
VSENSE = 100mV, VCC = 12V, VRS+ = 12V, TA = +25°C |
±0.66 ±5.5 | % | ||
Total OUT Voltage Error | VSENSE = 100mV | VCC = 12V, VRS+ = 12V, TA = TMIN to TMAX | ±7.5 | % | |
VCC = 28V, VRS+ = 28V, TA = TMIN to TMAX | ±0.55 ±7.5 | ||||
VCC = 12V, VRS+ = 0.1V | ±5.0 | ||||
VSENSE = 6.25mV, VCC = 12V, VRS+ = 12V | ±5.0 | ||||
OUT Voltage Low | VOUT | VCC = 2.7V | OUT = 10µA | 2.5 | mV |
IOUT = 100µA | 8.5 65 | ||||
OUT Voltage High | VCC - VOH | VCC = 2.7V, IOUT = -500µA | 0.25 | V |
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