Rainbow Electronics MAX6781 User Manual

General Description

The MAX6775–MAX6781 low-power, 1%-accurate bat­tery monitors are available in the ultra-small µDFN
package (1.0mm x 1.5mm) and SC70 packages. These
low-power devices are ideal for monitoring single lithi­um-ion (Li+) cells, or multicell alkaline/NiCd/NiMH
power sources. These devices offer single (MAX6775/
MAX6776/MAX6777/MAX6778) or dual (MAX6779/
MAX6780/MAX6781) low-battery outputs and feature
fixed or resistor-adjustable hysteresis. Hysteresis elimi­nates the output chatter sometimes associated with bat­tery voltage monitors, usually due to input-voltage noise
or battery terminal voltage recovery after load removal.

These devices are available in several versions: with
single- or dual-voltage monitors, and with fixed or
adjustable hysteresis. The MAX6775/MAX6776 offer a
single battery monitor and factory-set hysteresis of

0.5%, 5%, or 10%. The MAX6779/MAX6780/MAX6781
have two battery monitors in a single package and fac­tory-set hysteresis of 0.5%, 5%, or 10%. The MAX6777/
MAX6778 offer a single battery monitor with external
inputs for the rising and falling thresholds, allowing
external hysteresis control.

For convenient interface with system power circuitry or
microprocessors, both open-drain and push-pull out­puts are available. The single-channel devices are
available with open-drain or push-pull outputs. The
dual-channel devices are available with both outputs
open-drain, both outputs push-pull, or one of each
(see the Selector Guide). This family of devices is
offered in small 5-pin SC70 and ultra-small 6-pin µDFN
packages, and is fully specified over the -40°C to
+85°C extended temperature range.

Applications

Battery-Powered Systems (Single-Cell Li+ or
Multicell NiMH, NiCd, Alkaline)

Cell Phones/Cordless Phones

Pagers

Portable Medical Devices

PDAs

Electronic Toys

MP3 Players

Features

♦ 1.0%-Accurate Threshold Specified Over

Temperature

♦ Single/Dual, Low-Battery Output Options

♦ Low 3µA Battery Current

♦ Open-Drain or Push-Pull Low-Battery Outputs

♦ Fixed or Adjustable Hysteresis

♦ Low-Input Leakage Current Allows Use of Large

Resistors

♦ Guaranteed Valid Low-Battery-Output Logic State

Down to V

BATT

= 1V

♦ Immune to Short Battery Transients

♦ Fully Specified from -40°C to +85°C

♦ Small 5-Pin SC70 or Ultra-Small 6-Pin µDFN

(1mm x 1.5mm) Package

MAX6775–MAX6781

Low-Power, 1%-Accurate Battery

Monitor in µDFN and SC70 Packages

________________________________________________________________ Maxim Integrated Products 1

Ordering Information

LBI

3.6V

LBO

BATT

MAX6775

SHDN OUT

DC-DC

CONVERTER

IN

Typical Operating Circuit

19-3774; Rev 0; 8/05

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.

+Denotes lead-free package.

*Future product—contact factory for availability.
MAX6775/MAX6776/MAX6779/MAX6780/MAX6781 are available
with factory-trimmed hysteresis. Specify trim by replacing “_”
with “A” for 0.5%, “B” for 5%, or “C” for 10% hysteresis.

Pin Configurations appear at end of data sheet.

PART TEMP RANGE PIN-PACKAGE

MAX6775XK_+T -40°C to +85°C 5 SC70-5

MAX6775LT_+T* -40°C to +85°C 6 µDFN-6

MAX6776XK_+T* -40°C to +85°C 5 SC70-5

MAX6776LT_+T* -40°C to +85°C 6 µDFN-6

MAX6777XK+T -40°C to +85°C 5 SC70-5

MAX6777LT+T* -40°C to +85°C 6 µDFN-6

MAX6775–MAX6781

Low-Power, 1%-Accurate Battery
Monitor in µDFN and SC70 Packages

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(V

BATT

= 1.6V to 5.5V, TA= -40°C to +85°C, unless otherwise specified. Typical values are at TA= +25°C.) (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.

BATT to GND............................................................-0.3V to +6V

LBI, LBL, LBH, LBI1, LBI2 to GND ...............-0.3V to minimum of

((V

BATT

+ 0.3V) and +6V)

LBO, LBO1, LBO2 to GND (open-drain) .................-0.3V to +6V

LBO, LBO1, LBO2 to GND (push-pull).........-0.3V to minimum of

((V

BATT

+ 0.3V) and +6V)

Input Current (all pins) ........................................................20mA

Output Current (all pins) .....................................................20mA

Continuous Power Dissipation (T

A

= +70°C)

5-Pin SC70 (derate 3.1mW/°C above +70°C)..............247mW

6-Pin µDFN (derate 2.1mW°C above +70°C) ..............168mW

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

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

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

PARAMETER

CONDITIONS MIN TYP MAX

UNITS

TA = 0°C to +70°C 1.0 5.5

Operating Voltage Range
(Note 2)

TA = -40°C to +85°C 1.2 5.5

V

V

BATT

= 3.7V, no load 4 7

Supply Current I

Q

V

BATT

= 1.8V, no load 3.2 6

µA

FIXED HYSTERESIS (MAX6775/MAX6776/MAX6779/MAX6780/MAX6781)

0.5% hysteresis version

5% hysteresis version

LBI, LBI_ Falling Threshold
(Note 3)

V

LBIF

10% hysteresis version

V

LBI Rising Threshold V

LBIR

1.222

V

LBI Input Leakage Current 0.2V ≤ V

LBI

≤ V

BATT

- 0.2V -5 +5 nA

ADJUSTABLE HYSTERESIS (MAX6777/MAX6778)

LBL, LBH Threshold V

BATT

= 1.8V to 5.5V

1.222

V

LBL, LBH Input Leakage Current

V

BATT

- 0.2V ≥ V

LBL/LBH

≥ 0.2V -5 +5 nA

SYMBOL

V

BATT

1.2037 1.2159 1.2280

1.1493 1.1609 1.1725

1.0888 1.0998 1.1108

1.2098

1.2098

1.2342

1.2342

MAX6775–MAX6781

Low-Power, 1%-Accurate Battery

Monitor in µDFN and SC70 Packages

_______________________________________________________________________________________ 3

ELECTRICAL CHARACTERISTICS (continued)

(V

BATT

= 1.6V to 5.5V, TA= -40°C to +85°C, unless otherwise specified. Typical values are at TA= +25°C.) (Note 1)

Note 1: Devices are tested at T

A

= +25°C and guaranteed by design for TA=T

MIN

to T

MAX

, as specified.

Note 2: Operating range ensures low-battery output is in the correct state. Minimum battery voltage for electrical specification is 1.6V.
Note 3: The rising threshold is guaranteed to be higher than the falling threshold.

PARAMETER

SYMBOL

CONDITIONS MIN TYP MAX

UNITS

LOW-BATTERY OUTPUTS (LBO, LBO1, LBO2)

Propagation Delay t

PD

V

LBI_

+ 100mV to V

LBI_

- 100mV 9 µs

Startup Time V

BATT

rising above 1.6V 3 ms

V

BATT

≥ 1.2V, I

SINK

= 100µA 0.3

V

BATT

≥ 2.7V, I

SINK

= 1.2mA 0.3

Output Low (Push-Pull or
Open-Drain)

V

OL

V

BATT

≥ 4.5V, I

SINK

= 3.2mA 0.3

V

V

BATT

≥ 1.6V, I

SOURCE

= 100µA

0.8 x

V

BATT

≥ 2.7V, I

SOURCE

= 500µA

0.8 x

Output High (Push-Pull ) V

OH

V

BATT

≥ 4.5V, I

SOURCE

= 800µA

0.8 x

V

Output Leakage Current
(Open-Drain)

Output not asserted, V

LBO_

= 5.5V -100 +100 nA

Typical Operating Characteristics

(TA = +25°C, unless otherwise noted.)

SUPPLY CURRENT

vs. TEMPERATURE

MAX6775 toc01

TEMPERATURE (°C)

SUPPLY CURRENT (µA)

603510-15

3.0

3.5

4.0

4.5

5.0

5.5

6.0

2.5

-40 85

V

BATT

= 5V

V

BATT

= 3.6V

V

BATT

= 3V

V

BATT

= 2.4V

V

BATT

= 1.6V

PROPAGATION DELAY

vs. TEMPERATURE

MAX6775 toc02

TEMPERATURE (°C)

PROPAGATION DELAY (µs)

603510-15

8

9

10

11

12

7

-40 85

V

BATT

= 5V

100mV OVERDRIVE

V

BATT

= 1.6V

MAXIMUM TRANSIENT DURATION

vs. THRESHOLD OVERDRIVE

MAX6775 toc03

THRESHOLD OVERDRIVE VTH - VCC (mV)

MAXIMUM TRANSIENT DURATION (µs)

10010

10

20

30

40

50

60

70

0

1 1000

OUTPUT ASSERTED ABOVE THIS LINE

V

BATT

V

BATT

V

BATT

MAX6775–MAX6781

Low-Power, 1%-Accurate Battery
Monitor in µDFN and SC70 Packages

4 _______________________________________________________________________________________

Typical Operating Characteristics (continued)

(TA = +25°C, unless otherwise noted.)

NORMALIZED THRESHOLD VOLTAGES

vs. TEMPERATURE, MAX67__A

MAX6775 toc04

TEMPERATURE (°C)

THRESHOLD VOLTAGE (mV)

603510-15

-4

-3

-2

-1

0

1

-5

-40 85

NORMALIZED AT TA = +25°C

RISING

FALLING

NORMALIZED THRESHOLD VOLTAGES

vs. TEMPERATURE, MAX67__B

MAX6775 toc05

TEMPERATURE (°C)

THRESHOLD VOLTAGE (mV)

603510-15

-3

-2

-1

0

1

-4

-40 85

NORMALIZED AT TA = +25°C

RISING

FALLING

NORMALIZED THRESHOLD VOLTAGES

vs. TEMPERATURE, MAX67__C

MAX6775 toc06

TEMPERATURE (°C)

THRESHOLD VOLTAGE (mV)

603510-15

-2

-1

0

1

-3

-40 85

NORMALIZED AT TA = +25°C

RISING

FALLING

LBO OUTPUT VOLTAGE

vs. SINK CURRENT

MAX6775 toc07

SINK CURRENT (mA)

OUTPUT VOLTAGE (V)

12963

0.1

0.2

0.3

0.4

0.5

0

015

V

BATT

= 5.0V

V

BATT

= 1.8V

V

BATT

= 3.3V

LBO OUTPUT VOLTAGE
vs. SOURCE CURRENT

MAX6775 toc08

SOURCE CURRENT (mA)

OUTPUT VOLTAGE (V)

4321

1.5

2.0

2.5

3.0

3.5

4.0

4.5

5.0

5.5

1.0
05

V

BATT

= 5.0V

V

BATT

= 3.3V

V

BATT

= 1.8V