Rainbow Electronics MAX6380 User Manual

General Description

The MAX6375–MAX6380 are ultra-low-power circuits used for monitoring battery, power-supply, and regulated system voltages. Each detector contains a precision bandgap reference, comparator, and internally trimmed resistors that set specified trip threshold voltages. These devices provide excellent circuit reliability and low cost by eliminating external components and adjustments when monitoring nominal system voltages from 2.5V to 5V.

These circuits perform a single function: they assert an output signal whenever the VCCsupply voltage falls below a preset threshold. The devices are differentiated by their output logic configurations and preset threshold voltages. The MAX6375/MAX6378 (push-pull) and MAX6377/MAX6380 (open-drain) have an active-low output (OUT is logic low when VCCis below VTH). The MAX6376/MAX6379 have an active-high push-pull output (OUT is logic high when VCCis below VTH). All parts are guaranteed to be in the correct output logic state for VCCdown to 1V. The detector is designed to ignore fast transients on VCC. The MAX6375/MAX6376/ MAX6377 have voltage thresholds between 2.20V and

3.08V in approximately 100mV increments. The MAX6378/MAX6379/MAX6380 have voltage thresholds between 3.30V and 4.63V in approximately 100mV increments.

Ultra-low supply current of 500nA (MAX6375/MAX6376/ MAX6377) makes these parts ideal for use in portable equipment. All six devices are available in a space-saving SC70 package or in a tiny SOT23 package.

Applications

Precision Battery Monitoring

Load Switching/Power Sequencing

Power-Supply Monitoring in Digital/Analog Systems

Portable/Battery-Powered Equipment

Features

♦ Ultra-Low 500nA Supply Current

(MAX6375/MAX6376/MAX6377)

♦ Thresholds Available from 2.20V to 4.63V in

Approximately 100mV Increments

♦ ±2.5% Threshold Accuracy Over Temperature

♦ Low Cost ♦ Available in Three Versions: Push-Pull OUT,

Push-Pull OUT, and Open-Drain OUT

♦ Power-Supply Transient Immunity

♦ No External Components

♦ Available in Either a 3-Pin SC70

or 3-Pin SOT23 Package

MAX6375–MAX6380

3-Pin, Ultra-Low-Power SC70/SOT23

Voltage Detectors

________________________________________________________________ Maxim Integrated Products 1

Pin Configuration

19-1721; Rev 1; 12/01

The MAX6375/MAX6376/MAX6377 are available in factory-preset thresholds from 2.20V to 3.08V, in approximately 0.1V increments. The MAX6378/MAX6379/MAX6380 are available in factory-preset thresholds from 3.30V to 4.63V, in approximately

0.1V increments. Choose the desired threshold suffix from Table 1 and insert it in the blank spaces following R. There are 21 standard versions, with a required order increment of 2500 pieces. Sample stock is generally held on the standard versions only (see the Selector Guide). The required order increment is 10,000 pieces for nonstandard versions (Table 2). Contact factory for availability. All devices available in tape-and-reel only.

Ordering Information

Selector Guide appears at end of data sheet.

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

Ordering information continued at end of data sheet

PART* TEMP RANGE PIN-PACKAGE

MAX6375UR _ _ -T -40°C to +85°C 3 SOT23-3

MAX6375XR _ _ -T -40°C to +85°C 3 SC70-3

MAX6376UR _ _ -T -40°C to +85°C 3 SOT23-3

MAX6376XR _ _ -T -40°C to +85°C 3 SC70-3

TOP VIEW

OUT(OUT)

GND

MAX6375UR–

MAX6380UR

SOT23-3

GND

MAX6375XR–

MAX6380XR

OUT(OUT)

( ) ARE FOR MAX6376/MAX6379 ONLY.

SC70-3

MAX6375–MAX6380

3-Pin, Ultra-Low-Power SC70/SOT23 Voltage Detectors

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(VCC= full range, TA= -40°C to +85°C, unless otherwise noted. Typical values are at TA= +25°C and VCC= 3V.) (Note 1)

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.

Terminal Voltage (with respect to GND) V

...........................................................................-0.3V to +6V

OUT, OUT (push-pull) ................................-0.3V to (V

+ 0.3V)

OUT (open-drain) .....................................................-0.3V to +6V

Input Current (V

).............................................................20mA

Output Current (OUT, OUT) ................................................20mA

Continuous Power Dissipation (T

= +70°C)

3-Pin SC70 (derate 2.17mW/°C above +70°C)...........174mW

3-Pin SOT23 (derate 4mW/°C above +70°C)..............320mW

Operating Temperature Range ...........................-40°C to +85°C

Storage Temperature Range .............................-65°C to +150°C

Junction Temperature......................................................+150°C

Lead Temperature (soldering, 10s) .................................+300°C

Note 1: Production tested at +25°C only. Overtemperature limits are guaranteed by design, not production tested.

42VCC= (VTH- 100mV) to (VTH+ 100mV)

SINK

= 100µA, VCC≥ 1.2V, OUT asserted

0.4

OUT Output Voltage (MAX6375/MAX6377/ MAX6378/MAX6380)

SINK

= 1.6mA, VCC> 2.1V, OUT asserted

0.3 V

MAX6375/76/77 only, VCC= 3.0V for VTH≤ 2.93V, VCC= 3.2V for VTH> 2.93V, no load

SOURCE

= 500µA, VCC= 3.2V, MAX6375 only

SOURCE

= 800µA, VCC= 4.5V, VTH≤ 4.38V

OUT Output Voltage (MAX6375/MAX6377)

SOURCE

= 800µA, VCC= V

TH(MAX)

, VTH≥ 4.5V

TA= -40°C to +85°C

TA= 0°C to +70°C

CONDITIONS

ppm/°C40∆VTH/°CVoltage Threshold Tempco

VVCCOperating Range

UNITSMIN TYP MAXSYMBOLPARAMETER

VCC= (VTH+ 100mV) to (VTH- 100mV)

µs

Propagation Delay

MAX6375/MAX6376/MAX6377 6.3

MAX6378/MAX6379/MAX6380 9.5

Voltage Threshold Hysteresis

0.1 µA

Open-Drain OUT Output Leakage Current

0.8 ✕V

1.0 5.5

1.2 5.5

TA= -40°C to +85°C

TA= +25°C

Table 1

VTH- 2.5% VTHVTH+ 2.5%

VTH-1.5% VTHVTH+1.5%

Voltage Threshold

VCC= 5.5V, no load

Supply Current

0.5 1.0 µA

1.0 1.75

SOURCE

= 500µA, VCC≥ 2.1V, OUT asserted

0.8 ✕V

SINK

= 1.2mA, VCC≥ 3.2V, OUT not asserted,

MAX6376 only

0.3

SOURCE

= 50µA, VCC≥ 1.2V, OUT asserted

SINK

= 3.2mA, VCC≥ 4.5V, OUT not asserted,

VTH≤ 4.38V

0.4

SINK

= 3.2mA, VCC= V

TH(MAX)

, VTH≥ 4.5V 0.4

OUT Output Voltage (MAX6376/MAX6379)

MAX6375–MAX6380

3-Pin, Ultra-Low-Power SC70/SOT23

Voltage Detectors

______________________________________________________________________________________ 3

__________________________________________Typical Operating Characteristics

= 5V, TA = +25°C, unless otherwise noted.)

Pin Description

MAX6375/MAX6378 MAX6377/MAX6380

MAX6376 MAX6379

OUT

GND

NAME

Supply Voltage33

Active-High Output. OUT remains high while VCCis below the threshold.2—

Active-Low Output. OUT remains low while VCCis below the threshold. OUT is open-drain on the MAX6377/MAX6380 and push-pull on the MAX6375/MAX6378.

—2

Ground11

FUNCTION

SUPPLY CURRENT vs. TEMPERATURE

1.0

0.9

0.8

0.7

0.6

0.5

0.4

0.3

SUPPLY CURRENT (µA)

0.2

0.1

-40 0-20 20 40 60 80

VCC = 5V

VCC = 3.3V

VCC = 1.2V

TEMPERATURE (°C)

PROPAGATION DELAY (RISING)

vs. TEMPERATURE

140

120

100

VOD = 10mV

VOD = 20mV

MAX6375-01

PROPAGATION DELAY (µs)

MAX6375-03

PROPAGATION DELAY (FALLING)

vs. TEMPERATURE

200

150

100

VOD = 20mV

VOD = 10mV

VOD = 100mV

VOD = 200mV

-40 0-20 20 40 60 80 TEMPERATURE (°C)

MAXIMUM TRANSIENT DURATION

vs. THRESHOLD OVERDRIVE

500

400

300

MAX6375-02

MAX6375-04

PROPAGATION DELAY (µs)

-40 0 20-20 40 60 80

VOD = 100mV

VOD = 200mV

TEMPERATURE (°C)

200

100

MAXIMUM TRANSIENT DURATION (µs)

1 100 1000

OUT/OUT IS ASSERTED

ABOVE LINE

THRESHOLD OVERDRIVE

- V

(mV)

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