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DS2746
Low-Cost, 2-Wire Battery Monitor with Ratiometric A/D Inputs
2-Wire Fuel Gauge Measures Battery Current and Voltage and Includes Ratiometric Voltage Inputs that Can Be Used to Sample Thermistor, Pack ID, or Another Voltage Source
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Status
Active: In Production.
Description
The DS2746 provides system-side battery capacity monitoring in cost-sensitive applications. Voltage, bidirectional current, and accumulated current measurement data is provided to the host processor over a 2-wire interface. Offset bias and offset blanking features greatly enhance the accuracy of the coulomb counter. In addition, the DS2746 has two auxiliary A/D inputs to sample the pack identification resistor, thermistor, or other voltage source. The results are reported as a ratiometric fraction of the supply voltage eliminating error related to the supply. The DS2746 reduces the total power consumption of the measurement circuit by enabling the resistor dividers, through the VOUT pin, only while measurements are made. When the system is inactive, a low power sleep mode reduces current consumption while maintaining the coulomb count. The tiny 3mm × 3mm TDFN package consumes only 9mm² of PCB space
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Data Sheet
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An evaluation kit is available: DS2746EVKIT NOTE: This product uses the following:DS2746K Evaluation Kit Software
Key Features
- 14-Bit Bidirectional Current Measurement
- 6.25µV LSB, ±51.2mV Dynamic Range
- 416.7µA LSB, ±3.4A Range (RSNS = 15mΩ)
- Current Accumulation Register Resolution
- 6.25µVhr LSB, 409.6mVh Range
- 417µAhr LSB, 27.31Ah Range
- 11-Bit Battery Voltage Measurement
- 2.44mV LSB, 0V to 4.997V Input Range
- ±10mV Accuracy at 3.6V Input
- Two 11-Bit Aux Input Voltage Measurements
- Ratiometric Inputs Eliminate Supply Error
- VOUT drives Dividers, Reduces Power
- ±8 LSB Accuracy
- Low Power Consumption:
- Active Current: 70µA typical, 100µA max
- Sleep Current: 1µA typical, 3µA max
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Applications/Uses
- 2.5G/3G Wireless Handsets
- Digital Still and Video Cameras
- Handheld Computers and Terminals
- PDA/Smartphones
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Key Specifications:
| Battery Protectors, Selectors and Monitors |
| Part Number |
Functions |
Battery Type |
Interface |
Parameters Measured |
VSUPPLY
(V) |
VSUPPLY
(V) |
Package/Pins |
Smallest Available Pckg.
(mm2) |
Oper. Temp.
(°C) |
Budgetary Price |
| min |
max |
max w/pins |
See Notes |
| DS2746 |
Fuel Gauge |
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2-Wire |
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2.5 |
5.5 |
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9.6 |
-40 to +85 |
$1.67 @1k |
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See All Battery Protectors, Selectors and Monitors (29)
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Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific prices and delivery, please see the price and availability page or contact an authorized distributor.
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Diagram
Typical Operating Circuit
Application Notes
Reliability Reports
Software/Models
Ordering Information
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Part Number
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Free
Sample |
Buy |
Status
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Package:
TYPE PINS FOOTPRINT
DRAWING CODE/VAR *
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Temp |
RoHS/Lead-Free?
Materials Analysis
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| DS2746G+
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Active |
TDFN-EP;10 pin;9.6 mm²
Outline Drawing:21-0137 (PDF)
Land Pattern: 90-0003 (PDF)
Use pkgcode/variation: T1033+1*
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-40°C to +85°C
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RoHS/Lead-Free: Lead Free
Materials Analysis |
| DS2746G+T&R
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Active |
TDFN-EP;10 pin;9.6 mm²
Outline Drawing:21-0137 (PDF)
Land Pattern: 90-0003 (PDF)
Use pkgcode/variation: T1033+1*
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-40°C to +85°C
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RoHS/Lead-Free: Lead Free
Materials Analysis |
Notes:
- Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales.
- Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day.
- Part number suffixes: T or T&R = tape and reel; + = RoHS/lead-free; # = RoHS/lead-exempt; -D = drypack; -U/+U on DS parts = cut tape. More: See Full Data Sheet or Maxim Product Naming Conventions.
- * Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.
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Information Index
Document Ref.: 19-4632
Rev 4;
2009-06-22
This page last modified: 2009-09-04
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