Rainbow Electronics MAX6781 - Manual

General Description
The MAX6775–MAX6781 low-power, 1%-accurate bat-
tery 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 lithi-
um-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 elimi-
nates the output chatter sometimes associated with bat-
tery 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 fac-
tory-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 out-
puts 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