Datasheet

ManualsBrandsMAXIM INTEGRATED ManualsLinear ICsLinear IC - Custom amplification Amplifier, Comparator, Reference uMAX 10

General Description

The MAX4373/MAX4374/MAX4375 low-cost, micropow-

er, high-side current-sense supervisors contain a high-

side 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-detec-

tion 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 inte-

gration, resulting in a simple and compact current-

sense solution.

The MAX4373/MAX4374/MAX4375 operate from a sin-

gle +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 with Improved Accuracy

♦ 50µA Supply Current

♦ Single +2.7V to +28V Operating Supply

♦ 1mV (max) Input Offset Voltage

♦ 2% (max) Full-Scale Accuracy

♦ Internal Bandgap Reference (±1.6% Accuracy)

♦ Latching Comparator Output

♦ Three Gain Versions Available (+20V/V, +50V/V,

+100V/V)

♦ High Accuracy +2V to +28V Common-Mode

Range, Functional Down to 0V, Independent of

Supply Voltage

MAX4373/MAX4374/MAX4375

Low-Cost, Micropower, High-Side Current-Sense

Amplifier + Comparator + Reference ICs

________________________________________________________________

Maxim Integrated Products

MAX4373

RS-RS+

OUT

CIN

LOAD/

BATTERY

= 2.7V TO 28V

= 0 TO 28V

GND

SENSE

+ V

SENSE

LOAD

PULL-UP

(UP TO 5V)

COUT

0.1µF

RESET

Typical Operating Circuit

19-1630; Rev 4; 1/11

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,

or visit Maxim’s website at www.maxim-ic.com.

Pin Configurations appear at end of data sheet.

Denotes a lead(Pb)-free/RoHS-compliant package.

Ordering Information continued at end of data sheet.

Ordering Information

PART TEMP RANGE

PIN-

PACKAGE

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

µMAX is a registered trademark of Maxim Integrated Products, Inc.

EVALUATION KIT

AVAILABLE

Summary of content (13 pages)

PAGE 1
9-1630; Rev 4; 1/11 KIT ATION EVALU E L B AVAILA Low-Cost, Micropower, High-Side Current-Sense Amplifier + Comparator + Reference ICs 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.
PAGE 2
MAX4373/MAX4374/MAX4375 Low-Cost, Micropower, High-Side Current-Sense Amplifier + Comparator + Reference ICs 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.......
PAGE 3
Low-Cost, Micropower, High-Side Current-Sense Amplifier + Comparator + Reference ICs (VCC = +2.7V to +28V, VRS+ = 0 to +28V, VSENSE = 0V, V RESET = 0V, RLOAD= 1MΩ, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1) PARAMETER -3dB Bandwidth SYMBOL BW CONDITIONS VRS+ = 12V, VCC = 12V, CLOAD = 10pF MIN VSENSE = 100mV, Gain = +20V/V 200 VSENSE = 100mV, Gain = +50V/V 120 VSENSE = 100mV, Gain = +100V/V 110 VSENSE = 6.
PAGE 4
ELECTRICAL CHARACTERISTICS (continued) (VCC = +2.7V to +28V, VRS+ = 0 to +28V, VSENSE = 0V, V RESET = 0V, RLOAD= 1MΩ, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1) PARAMETER SYMBOL Output High Leakage Current CONDITIONS MIN TYP MAX UNITS 1 µA VCC = 28V, VPULL-UP = 5V (Note 10) RESET Input High Voltage VIH RESET Input Low Voltage VIL 2.0 V µA Minimum RESET Pulse Width tRPW 1.
PAGE 5
Low-Cost, Micropower, High-Side Current-Sense Amplifier + Comparator + Reference ICs TOTAL OUTPUT ERROR vs. SUPPLY VOLTAGE TOTAL OUTPUT ERROR vs. SENSE VOLTAGE 1.0 OUTPUT ERROR (%) 2 1 AV = +20V/V -2 -3 AV = +20V/V -0.5 -1.0 AV = +50V/V -2.0 -1.5 -2.5 25 SUPPLY VOLTAGE (V) 50 75 100 125 150 10 AV = +100V/V AV = +50V/V 1.
PAGE 6
Typical Operating Characteristics (continued) (VRS+ = +12V, VCC = +12V, R LOAD = 1MΩ, V RESET = 0V, VSENSE = 100mV, VPULL-UP = +5V, RPULL-UP = 10kΩ, TA = +25°C, unless otherwise noted.) LARGE-SIGNAL PULSE RESPONSE (AV = +100V/V) LARGE-SIGNAL PULSE RESPONSE (AV = +50V/V) LARGE-SIGNAL PULSE RESPONSE (AV = +20V/V) 50mV 5mV 3V 7.5V 9.5V 2.5V 20µs/div POWER-SUPPLY REJECTION vs. FREQUENCY COMMON-MODE REJECTION vs.
PAGE 7
Low-Cost, Micropower, High-Side Current-Sense Amplifier + Comparator + Reference ICs COMPARATOR POWER-UP DELAY POWER-UP DELAY MAX4373 toc20 MAX4373 toc19 VCC = VPULL-UP AV = +20V/V 5V 6V VCC VCC 0 0 5V 2V OUTPUT OUTPUT 0 0 10µs/div 100µs/div COMPARATOR TRIP POINT vs. SUPPLY VOLTAGE 598 597 MAX4373 toc22 599 TRIP POINT (mV) COMPARATOR PROPAGATION DELAY MAX4373 toc21 600 VOD = 5mV INPUT 125mV/div 596 595 594 593 OUTPUT 2.
PAGE 8
Typical Operating Characteristics (continued) (VRS+ = +12V, VCC = +12V, R LOAD = 1MΩ, V RESET = 0V, VSENSE = 100mV, VPULL-UP = +5V, RPULL-UP = 10kΩ, TA = +25°C, unless otherwise noted.) COMPARATOR RESET VOLTAGE vs. SUPPLY VOLTAGE MAX4373 toc28 1.8 80 70 60 1.6 VOL (mV) RESET VOLTAGE (V) COMPARATOR VOL vs. ISINK 90 MAX4373 toc27 2.0 1.4 1.2 50 40 30 20 1.0 10 0.8 0 5 10 15 20 25 30 0 0.2 0.4 0.6 SUPPLY VOLTAGE (V) 0.8 1.0 1.2 1.4 1.6 ISINK (mA) TOTAL OUTPUT ERROR vs.
PAGE 9
Low-Cost, Micropower, High-Side Current-Sense Amplifier + Comparator + Reference ICs PIN NAME FUNCTION MAX4373 MAX4374/MAX4375 µMAX/SO µMAX SO 1 1 1 VCC Supply Voltage Input 2 2 2 OUT Voltage Output. VOUT is proportional to VSENSE (VRS+ - VRS-). 3 3 4 CIN1 Comparator Input 1. Positive input of an internal comparator. The negative terminal is connected to a 0.6V internal reference. — 4 5 CIN2 Comparator Input 2. Terminal of a second internal comparator.
PAGE 10
MAX4373/MAX4374/MAX4375 Low-Cost, Micropower, High-Side Current-Sense Amplifier + Comparator + Reference ICs Internal Comparator(s) The MAX4373/MAX4374/MAX4375 contain an opendrain output comparator for current limiting. The comparator’s negative terminal is connected to the internal 600mV reference. The positive terminal is accessible at CIN1. When RESET is high, the internal latch is active, and once CIN1 rises above 600mV, the output latches into the open state. Pulsing RESET low for 1.
PAGE 11
Low-Cost, Micropower, High-Side Current-Sense Amplifier + Comparator + Reference ICs VIN = 0 TO 28V RSENSE LOAD RS+ VCC = 2.7V TO 28V RS- VCC OUT VPULL-UP (UP TO 5V) R1 MAX4375 R3 CIN2 COUT1 R4 R2 CIN1 COUT2 GND RESET R5 GND The RESET pin is used to control the latch function of comparator 1. Holding RESET low (<0.8V) makes the latch transparent and COUT1 will respond to changes at CIN1, above and below the internal 600mV reference threshold voltage. When RESET is high (>2.
PAGE 12
MAX4373/MAX4374/MAX4375 Low-Cost, Micropower, High-Side Current-Sense Amplifier + Comparator + Reference ICs Pin Configurations TOP VIEW + + CIN1 14 RS+ OUT 2 13 RS- 10 RS+ N.C. 3 12 N.C. 9 RS- CIN1 4 8 COUT1 CIN2 5 7 COUT2 N.C. 6 9 N.C.
PAGE 13
Low-Cost, Micropower, High-Side Current-Sense Amplifier + Comparator + Reference ICs REVISION NUMBER REVISION DATE 3 6/10 Clarified 0V to 2V is not a high-accuracy range for the device, added lead-free options and soldering temperature 4 1/11 Clarified VRS+ conditions in Electrical Characteristics table DESCRIPTION PAGES CHANGED 1, 2, 12 2 Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied.