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DS2786BG-

Description
Accelerometers
Categorysemiconductor    Power management   
File Size353KB,21 Pages
ManufacturerMaxim
Websitehttps://www.maximintegrated.com/en.html
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DS2786BG- Overview

Accelerometers

DS2786BG- Parametric

Parameter NameAttribute value
Product CategoryBattery Management
ManufacturerMaxim
RoHSDetails
ProductFuel Gauges
Battery TypeLi-Ion, Li-Polymer
Operating Supply Voltage2.5 V to 4.5 V
Operating Supply Current50 uA
Minimum Operating Temperature- 40 C
Maximum Operating Temperature+ 85 C
Package / CaseTDFN-10
PackagingBulk
Mounting StyleSMD/SMT
Factory Pack Quantity100
Unit Weight0.001764 oz
19-5223; Rev 1; 4/10
Stand-Alone OCV-Based Fuel Gauge
General Description
The DS2786B estimates available capacity for recharge-
able Li-ion (Li+) and Li+ polymer batteries based on the
cell voltage in the open-circuit state following a relax-
ation period. The open-circuit voltage (OCV) is used to
determine relative cell capacity based on a lookup table
stored in the IC. This capability makes accurate capacity
information available immediately after a battery pack is
inserted. During periods of moderate to high rate dis-
charging, which preclude OCV measurements, the
DS2786B uses coulomb counting as a secondary
means of estimating relative capacity.
Remaining capacity is reported in percent, along with
cell voltage, current, and temperature information. Cell
characteristics and application parameters used in the
calculations are stored in on-chip EEPROM.
The DS2786B is intended for use on the host side of
portable devices, though it can also be mounted within a
battery pack. Measurement and estimated capacity data
are accessed through an I
2
C interface. Temperature
data is available from an on-die sensor. Resistance mea-
surements of a pack identification resistor and pack ther-
mistor are supported by ratiometric measurements on
two auxiliary inputs.
The DS2786B comes in a 10-pin, lead-free, TDFN 3mm
x 3mm package with an exposed pad (EP).
Features
Relative Capacity Calculated from Combination
Coulomb Counter and Open-Circuit Cell Voltage
(OCV) Battery Model
Accurate Warning of Low-Battery Conditions
Even on First Cycle (No Learn Cycle Needed)
12-Bit Battery Voltage Measurement
±10mV Accuracy
1.22mV LSB, 0V to 4.5V Input Range
11-Bit Bidirectional Current Measurement
25µV LSB, ±51.2mV Dynamic Range
1.67mA LSB, ±3.4A (R
SNS
= 15mΩ)
Current Accumulation Measurement Resolution
±204.8mVh Range
±13.65Ah (R
SNS
= 15mΩ)
Internal Temperature Measurement
0.125°C LSB, ±3°C Accuracy
Two 11-Bit Auxiliary Input-Voltage Measurements
±8 LSB Accuracy, Ratiometric Inputs Eliminate
Supply Accuracy Issues
V
OUT
Pin Drives Resistive Dividers, Reduces
Current Consumption
2-Wire Interface
Low Power Consumption
Active Current: 50µA (typ), 80µA (max)
Sleep Current: 1µA (typ), 3µA (max)
DS2786B
Applications
3G Multimedia Wireless Handsets
Digital Still Cameras
Digital Audio (MP3) Players
PART
DS2786BG+
Ordering Information
TEMP RANGE
-20°C to +70°C
PIN-PACKAGE
10 TDFN-EP*
DS2786BG+T&R
-20°C to +70°C
10 TDFN-EP*
+Denotes
a lead(Pb)-free/RoHS-compliant package.
*EP
= Exposed pad.
T&R = Tape and reel.
Operating Diagram
V
OUT
V
IN
SYSTEM
μP
DS2786B
Li+
PROTECTION
CIRCUIT
THERMISTOR
PACKID
AIN0
AIN1
V
SS
SDA
SCL
SNS
I
2
C
INTERFACE
R
SNS
(EEPROM PROGRAMMING TEST POINT NOT SHOWN)
________________________________________________________________
Maxim Integrated Products
1
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.

DS2786BG- Related Products

DS2786BG- DS2786BG-TR
Description Accelerometers Battery Management Stand-Alone Fuel Gauge
Product Category Battery Management Battery Management
Manufacturer Maxim Maxim
RoHS Details Details
Product Fuel Gauges Fuel Gauges
Battery Type Li-Ion, Li-Polymer Li-Ion, Li-Polymer
Operating Supply Voltage 2.5 V to 4.5 V 2.5 V to 4.5 V
Operating Supply Current 50 uA 50 uA
Minimum Operating Temperature - 40 C - 40 C
Maximum Operating Temperature + 85 C + 85 C
Package / Case TDFN-10 TDFN-10
Packaging Bulk Reel
Mounting Style SMD/SMT SMD/SMT
Factory Pack Quantity 100 2500
Unit Weight 0.001764 oz 0.001764 oz
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