DS2788 Stand-Alone Fuel-Gauge IC with LED Display Drivers

Description

The DS2788 measures voltage, temperature, and current, and estimates available capacity for rechargeable lithium-ion (Li+) and Li+ polymer batteries. Cell characteristics and application parameters used in the calculations are stored in on-chip EEPROM. The available capacity registers report a conservative estimate of the amount of charge that can be removed given the current temperature, discharge rate, stored charge, and application parameters. Capacity estimation is reported in mAh remaining and percentage of full.

LED display drivers and a debounced input make display of the capacity information easy. The LED pins can directly sink current, requiring only a resistor for setting the current in the LED display, thus reducing space and cost.

Key Features

Applications/Uses

Five 30mA Open-Drain Drivers for Driving LED Fuel-Gauge Display
Debounced Fuel-Gauge Display Enable
Internal Voltage Measurement Gain Register for Trimming External Voltage-Divider
Pin for Driving FETs to Enable Voltage-Divider Only During Voltage Measurement, Conserving Power
Precision Voltage, Temperature, and Current Measurement System
Accurate, Temperature-Stable, Internal Time Base
Absolute and Relative Capacity Estimated from Coulomb Count, Discharge Rate, Temperature, and Battery Cell Characteristics
Accurate Warning of Low Battery Conditions
Automatic Backup of Coulomb Count and Age Estimation to Nonvolatile (NV) EEPROM
Gain and Tempco Calibration Allows the Use of Low-Cost Sense Resistors
24-Byte Battery/Application Parameter EEPROM
16-Byte User EEPROM
Unique ID and Multidrop 1-Wire® Interface
14-Pin TSSOP Package

	Digital Cameras
	Electric Bicycles
	Electric Vehicles
	Power Tools
	Uninterruptible Power Supply

Key Specifications: Battery Protectors, Selectors and Monitors

Part Number

Functions

Battery Type

Interface

User Data Storage (bytes)

Parameters Measured

Supply Voltage (min) (V)

Supply Voltage (max) (V)

Features

Package

Smallest Available Package (max w/pins) (mm²)

RoHS Available

Operating Temp. Range (°C)

Price^**

DS2788

•	Fuel Gauge

1-10 Cell Li-Ion

1-Wire

16 EEPROM

Current
Temperature
Voltage

2.5

5.5

•	Digital Current Accumulation

•	External MOSFET Drivers

•	Integrated LED Drivers

•	On-chip Remaining Capacity Algorithms

•

Unique ID

TSSOP/14

Yes

-40 to +85

$2.72 @ 1k

See All Battery Protectors, Selectors and Monitors (21)

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.

Ordering Information

Notes:

Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales.
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Part number suffixes: T or T&R = tape and reel; + = RoHS/lead-free; # = RoHS/lead-exempt. More: SeeFull Data Sheet or Part 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.

Devices: 1-2 of 2

DS2788

Free
Sample

Buy

Package:	TYPE PINS FOOTPRINT
	DRAWING CODE/VAR *

Temp

RoHS/Lead-Free?
Materials Analysis

DS2788E+

TSSOP;14 pin;33 mm²
Dwg: 56-G2015-000B (PDF)
Use pkgcode/variation: U14+1*

-40°C to +85°C

RoHS/Lead-Free: Lead Free
Materials Analysis

DS2788K

TSSOP;14 pin;33 mm²
Dwg: 56-G2015-000B (PDF)
Use pkgcode/variation: U14+1*

-40°C to +85°C

RoHS/Lead-Free: Lead Free
Materials Analysis