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DESCRIPTION
The Texas Instruments bq27425 system-side LiCoO2 battery fuel gauge is an easy to configure microcontroller peripheral that provides fuel gauging for single-cell LiCoO2 battery packs. The device requires minimal user configurations and system microcontroller firmware development for accurate fuel gauging.
The bq27425 uses the patented Impedance Track™ algorithm for fuel gauging, and provides information such as remaining battery capacity (mAh), state-of-charge (%), and battery voltage (mV).
Battery fuel gauging with the bq27425 requires only PACK+ (P+), PACK– (P–), for a removable battery pack or embedded battery circuit. The 15-pin 2,69 × 1,75 mm, 0.5 mm pitch CSP package is ideal for space constrained applications.

FEATURES
• Battery Fuel Gauge for 1-Series LiCoO2 battery
   Applications
• Easy to Configure Battery Fuel Gauging Based
   on Patented Impedance Track™ Technology
   – Models Battery Discharge Curve for
      Accurate State-of-Charge Report
   – Automatically Adjusts for Battery Aging,
      Battery Self-Discharge, and
      Temperature/Rate Inefficiencies
   – Low-Value Integrated Sense Resistor
      (10 mΩ typical)
• Resides on System Main Board
   – Works with Embedded or Removable
      Battery Packs
   – Integrated LDO allows devices to be
      powered directly from battery pack
• Microcontroller Peripheral Provides:
   – Accurate Battery Fuel Gauging
   – Internal Temperature Sensor for Battery
      Temperature Reporting
   – Configurable Level of State-of-Charge
      (SOC) Interrupts
• I2C™ for Connection to System
   Microcontroller Port
• Small 15-pin 2,69 × 1,75 mm, 0.5 mm pitch
   CSP package
  
APPLICATIONS
• Feature Phones
• Smart Phones
• PDAs
• Digital Still and Video Cameras
• Handheld Terminals
• MP3 or Multimedia Players

DESCRIPTION
The bq24190, bq24192, bq24192I, and bq24193 are highly-integrated switch-mode battery charge management and system power path management devices for single cell Li-Ion and Li-polymer battery in a wide range of tablet and other portable devices. Its low impedance power path optimizes switch-mode operation efficiency, reduces battery charging time and extends battery life during discharging phase. The I2C serial interface with charging and system settings makes the device a truly flexible solution.

FEATURES
• High Efficiency 4.5A Switch Mode Charger
– 92% Charge Efficiency at 2A, 90% at 4A
– Accelerate Charge Time by Battery Path Impedance Compensatioin
• Highest Battery Discharge Efficiency with 12mΩ Battery Discharge MOSFET up to 9A Discharge Current
• Single Input USB-compliant/Adapter Charger
– USB Host or Charging Port D+/D- Detection Compatible to USB Battery Charger Spec 1.2
– Input Voltage and Current Limit Supports USB2.0 and USB 3.0
– Input Current Limit: 100mA, 150mA, 500mA, 900mA, 1.2A, 1.5A, 2A and 3A
• 3.9V–17V Input Operating Voltage Range
– Support All Kinds of Adapter with Input Voltage DPM Regulation
• USB OTG 5V at 1.3A Synchronous Boost Converter Operation
– 93% 5V Boost Efficiency at 1A
• Narrow VDC (NVDC) Power Path Management
– Instant-on Works with No Battery or Deeply Discharged Battery
– Ideal Diode Operation in Battery Supplement Mode
• 1.5MHz Switching Frequency for Low Profile Inductor
• Autonomous Battery Charging with or without Host Management
– Battery Charge Enable
– Battery Charge Preconditioning
– Charge Termination and Recharge
• High Accuracy (0°C to 125°C)
– ±0.5% Charge Voltage Regulation
– ±7% Charge Current Regulation
– ±7.5% Input Current Regulation
– ±2% Output Regulation in Boost Mode
• High Integration
– Power Path Management
– Synchronous Switching MOSFETs
– Integrated Current Sensing
– Bootstrap Diode
– Internal Loop Compensation
• Safety
– Battery Temperature Sensing and Charging Safety Timer
– JEITA Guideline Compliant (bq24193)
– Thermal Regulation and Thermal Shutdown
– Input System Over-Voltage Protection
– MOSFET Over-Current Protection
• Charge Status Outputs for LED or Host Processor
• Low Battery Leakage Current and Support Shipping Mode
• 4mm x 4mm QFN-24 Package

APPLICATIONS
• Tablet PC
• Smart Phone
• Portable Audio Speaker
• Portable Media Players
• Internet Devices

DESCRIPTION
The bq24195L, bq24195 are highly-integrated switch-mode battery charge management and system power path management devices for single cell Li-Ion and Li-polymer battery in a wide range of power bank, tablet and other portable devices. Its low impedance power path optimizes switch-mode operation efficiency, reduces battery charging time and extends battery life during discharging phase. The I2C serial interface with charging and system settings makes the device a truly flexible solution.

FEATURES
• High Efficiency Switch Mode Charger
   – 2.5A(bq24195L) or 4.5A(bq24195) Fast Charging
   – 92% Charge Efficiency at 2A, 90% at 4A
• Synchronous Boost Converter in Battery Boost Mode
   – 5.1V at 1A (bq24195L) or 5.1V at 2.1A (bq24195)
   – 94% 5.1V Boost Efficiency at 1A, 91% at 2.1A
• Highest Battery Discharge Efficiency with 12mΩ Battery Discharge MOSFET up to 9A
    Discharge Current
• Single Input USB-compliant/Adapter Charger
   – USB Host or Charging Port D+/D- Detection Compatible to USB Battery Charger Spec 1.2
   – Input Voltage and Current Limit Supports USB2.0 and USB 3.0
   – Input Current Limit: 100mA, 150mA, 500mA, 900mA, 1.2A, 1.5A, 2A and 3A
• 3.9V–17V Input Operating Voltage Range
   – Support All Kinds of Adapter with Input Voltage DPM Regulation
• Narrow VDC (NVDC) Power Path Management
   – Instant-on Works with No Battery or Deeply Discharged Battery
   – Ideal Diode Operation in Battery Supplement Mode
• 1.5MHz Switching Frequency for Low Profile Inductor
• Autonomous Battery Charging with or without Host Management
   – Battery Charge Enable
   – Battery Charge Preconditioning
   – Charge Termination and Recharge
• High Accuracy (0°C to 125°C)
   – ±0.5% Charge Voltage Regulation
   – ±7% Charge Current Regulation
   – ±7.5% Input Current Regulation
   – ±2% Output Regulation in Boost Mode
• High Integration
   – Power Path Management
   – Synchronous Switching MOSFETs
   – Integrated Current Sensing
   – Bootstrap Diode
   – Internal Loop Compensation
• Safety
   – Battery Temperature Sensing and Charging Safety Timer
   – Thermal Regulation and Thermal Shutdown
   – Input System Over-Voltage Protection
   – MOSFET Over-Current Protection
• Charge Status Outputs for LED or Host Processor
• Low Battery Leakage Current and Support Shipping Mode
• 4mm x 4mm QFN-24 Package

APPLICATIONS
• Power Bank for Smartphone, Tablet
• Tablet PC
• Smart Phone
• Portable Audio Speaker
• Portable Media Players
• Internet Devices

DESCRIPTION
The Texas Instruments bq27541 Li-Ion battery fuel gauge is a microcontroller peripheral that provides fuel gauging for single-cell Li-Ion battery packs. The device requires little system microcontroller firmware development for accurate battery fuel gauging. The bq27541 resides within the battery pack or on the system’s main-board with an embedded battery (nonremovable).
The bq27541 uses the patented Impedance Track™ algorithm for fuel gauging, and provides information such as remaining battery capacity (mAh), state-of-charge (%), run-time to empty (min.), battery voltage (mV), and temperature (°C).
The bq27541 also features integrated support for secure battery pack authentication, using the SHA-1/HMAC authentication algorithm.

FEATURES
• Battery Fuel Gauge for 1-Series Li-Ion
   Applications
• Microcontroller Peripheral Provides:
   – Accurate Battery Fuel Gauging
   – Internal Temperature Sensor for System
      Temperature Reporting
   – SHA-1/HMAC Authentication
   – Lifetime Data Logging
   – 96 Bytes of Non-Volatile Scratch Pad
      FLASH
• Battery Fuel Gauging Based on Patented
   Impedance Track™ Technology
   – Models Battery Discharge Curve for
      Accurate Time-To-Empty Predictions
   – Automatically Adjusts for Battery Aging,
      Battery Self-Discharge, and
      Temperature/Rate Inefficiencies
   – Low-Value Sense Resistor (5mΩ to 20mΩ)
• HDQ and I2C™ Interface Formats for
   Communication With Host System
• Small 12-pin 2.5 mm × 4 mm SON Package

APPLICATIONS
• Smartphones
• PDAs
• Digital Still and Video Cameras
• Handheld Terminals
• MP3 or Multimedia Players

DESCRIPTION
The DS2437 Smart Battery Monitor provides several functions that are desirable to carry in a battery pack: a means of tagging a battery pack with a unique serial number; a direct-to-digital temperature sensor which eliminates the need for thermistors in the battery pack; an A/D converter which measures the battery voltage and current; an integrated current accumulator, which keeps a running total of all current going into and out of the battery; a real-time clock; and 40 bytes of nonvolatile EEPROM memory for storage of important parameters such as battery capacity, capacity remaining, and indication of battery cycling.
Information is sent to/from the DS2437 over a 1-Wire interface, so that only one wire (and ground) needs to be connected from a central microprocessor to a DS2437. This means that battery packs need only have three output connectors: battery power, ground, and the 1-Wire interface.
Because each DS2437 contains a unique silicon serial number, multiple DS2437s can exist on the same 1-Wire bus. This allows multiple battery packs to be charged or used in the system simultaneously.

FEATURES
■ Unique 1-Wire® interface requires only one port pin for communication
■ Provides unique 64-bit serial number to battery packs
■ Eliminates thermistors by sensing battery temperature on-chip
■ On-board A/D converter allows monitoring of battery voltage for end-of-charge and end-of discharge determination
■ On-board integrated current accumulator facilitates gas gauging
■ Real-time clock in binary format
■ 40-byte nonvolatile user memory available for storage of user data such as gas gauge and manufacturing information
■ Operating range -40°C to +85°C
■ Applications include portable computers, portable/cellular phones, consumer electronics, and handheld instrumentation

Low Power RTC with VDD Battery Backed SRAM and Embedded Temp Compensation ±5ppm with Auto Day Light Saving

The ISL12021 device is a low power real time clock with an embedded Temp sensor for oscillator compensation, clock/calendar, power fail, low battery monitor, brown out indicator, single periodic or polled alarms, intelligent battery backup switching and 128 bytes of battery-backed user SRAM.
The oscillator uses an external, low-cost 32.768kHz crystal.
The real time clock tracks time with separate registers for hours, minutes, and seconds. The device has calendar registers for date, month, year and day of the week. The calendar is accurate through 2099, with automatic leap year correction.
Daylight Savings time adjustment is done automatically, using parameters entered by the user. Power fail and battery monitors offer user-selectable trip levels. A time stamp function records the time and date of switchover from VDD to battery power, and also from battery to VDD power.

Features
• Real Time Clock/Calendar
   - Tracks Time in Hours, Minutes and Seconds
   - Day of the Week, Day, Month and Year
• On-chip Oscillator Compensation Over the Operating
   Temp Range
   - ±5ppm over -20°C to +70°C
• Day Light Saving Time
   - Customer Programmable
• Separate FOUT pin
   - 15 Selectable Frequency Outputs
• 1 Alarm
   - Settable to the Second, Minute, Hour, Day of the Week,
      Day, or Month
   - Single Event or Pulse Interrupt Mode
   - Dedicated IRQ output pin
• Automatic Backup to Battery or Super Cap
   - Operation to VBAT = 1.8V
   - 1.0µA Battery Supply Current
• Battery Status Monitor, 2 Levels, Selectable by Customer
   to:
   - Seven Selectable Voltages for Each Level
• Power status Brown Out Monitor
   - Six selectable trip level, from 4.675V to 2.295V
   - Separate Low Voltage LVRST pin
• Time Stamp during Power to Battery and Battery to Power
   Cross Over
   - Time Stamp. First VDD to VBAT, and Last VBAT to VDD
• 128 Bytes Battery-Backed User SRAM
• I2C Interface
   - 400kHz Clock Frequency
• 14 Ld TSSOP package
• Pb-Free Plus Anneal Available (RoHS Compliant)

Applications
• Utility Meters
• POS Equipment
• Medical Application
• Security Related Application
• Vending Machine
• White Goods

DESCRIPTION
The bq24630 is a highly integrated switch-mode battery charge controller designed specifically for lithium phosphate batteries. It offers a constant-frequency synchronous PWM controller with high-accuracy current and voltage regulation, charge preconditioning, termination, adapter current regulation, and charge status monitoring.
The bq24630 charges the battery in three phases: preconditioning, constant current, and constant voltage. Charge is terminated when the current reaches a minimum user-selectable level. A programmable charge timer provides a safety backup. The bq24630 automatically restarts the charge cycle if the battery voltage falls below an internal threshold and enters a low-quiescent-current sleep mode when the input voltage falls below the battery voltage.

FEATURES
• 300-kHz NMOS-NMOS Synchronous Buck
   Converter
• Stand-Alone Charger Specifically for Lithium
   Phosphate
• 5-V–28-V VCC Input Operating Range,
   Supports 1–7 Battery Cells
• High-Accuracy Voltage and Current Regulation
   – ±0.5% Charge Voltage Accuracy
   – ±3% Charge Current Accuracy
   – ±3% Adapter Current Accuracy
• Integration
   – Automatic System Power Selection From
      Adapter or Battery
   – Internal Loop Compensation
   – Internal Soft Start
   – Dynamic Power Management (DPM)
• Safety Protection
   – Input Overvoltage Protection
   – Battery Thermistor Sense Suspend Charge
      at Hot/Cold and Automatically ICHARGE/8 at
      Hot/Cold or Warm/Cool
   – Battery Detection
   – Reverse Protection Input FET
   – Programmable Safety Timer
   – Charge Overcurrent Protection
   – Battery Short Protection
   – Battery Overvoltage Protection
   – Thermal Shutdown
• Status Outputs
   – Adapter Present
   – Charger Operation Status
• Charge Enable Pin
• 6-V Gate Drive for Synchronous Buck
   Converter
• 30-ns Driver Dead Time and 99.95% Max.
   Effective Duty Cycle
• 24-Pin 4-mm × 4-mm QFN Package
• Energy Star Low Quiescent Current Iq
   – < 15-μA Off-State Battery Discharge Current
   – < 1.5-mA Off-State Input Quiescent Current

APPLICATIONS
• Power Tool and Portable Equipment
• Personal Digital Assistants
• Handheld Terminals
• Industrial and Medical Equipment
• Netbook, Mobile Internet Device, and
   Ultra-Mobile PC

Description
The bq24715 is a NVDC-1 synchronous battery charge controller with low quiescent current, high light load efficiency for 2S or 3S Li-ion battery charging applications, offering low component count.
The power path management allows the system to be regulated at battery voltage but does not drop below the programmable system minimum voltage.
The bq24715 provides N-channel ACFET and RBFET drivers for the power path management. It also provides driver of the external P-channel battery FET. The loop compensation is fully integrated.
The bq24715 has programmable 11-bit charge
voltage, 7-bit input/charge current and 6-bit minimal system voltage with very high regulation accuracies through the SMBus communication interface.
The v monitors adapter current or battery discharge current through the IOUT pin allowing the host to throttle down CPU speed when needed.
The bq24715 provides extensive safety features for over current, over voltage and MOSFET short circuit.

Features
• 6-24V Input SMBus NVDC-1 2-3S Battery
   Charger Controller
• System Instant-on Operation with No Battery or
   Deeply Discharged Battery
• Ultra-Fast Transient Response of 100 µs
• Ultra-Low Quiescent Current of 500 µA and High
   PFM Light Load Efficiency 80% at 20mA load to
   Meet Energy Star and ErP Lot6
• Switching Frequency: 600kHz/800kHz/1MHz
• Programmable System/Charge Voltage (16
   mV/step), Input/Charge Current (64 mA/step) with
   High Accuracy
   – ±0.5% Charge Voltage Regulation
   – ±3% Input/Charge Current Regulation
   – ±2% 40x Input/16x Discharge Current Monitor
      Output
• Support Battery LEARN Function
• Maximize CPU Performance with Deeply
   Discharged Battery or No Battery
• Integrated NMOS ACFET and RBFET Driver
• 20-pin 3.5 x 3.5 mm2 QFN Package

Applications
• Ultrabook, Notebook, and Tablet PC
• Industrial and Medical Equipment
• Portable Equipment

Description
The bq24618 device is highly integrated Li-ion or Li-polymer switched-mode battery-charge controller. The bq24618 offers a constant-frequency synchronous switching PWM controller with high-accuracy charge current and voltage regulation, charge preconditioning, termination, adapter current regulation and charge status monitoring.
The bq24618 operates from either a USB port or AC adapter and supports charge currents up to 10 A. The device charges the battery in three phases: preconditioning, constant current, and constant voltage. Charge is terminated when the current reaches a minimum user-selectable level. A programmable charge timer provides a safety backup for charge termination. The bq24618 automatically restarts the charge cycle if the battery voltage falls below an internal threshold, and enters a low quiescent current sleep mode when the input voltage falls below the battery voltage.

Features
• USB-Friendly 4.7-V to 28-V Input Operating
   Range
• Stand-Alone Charge Controller to Support 1 to 6
   Li-Ion or Li-Polymer Battery Cells
• Up to 10-A Charge Current and Adapter Current
• 600-kHz NMOS-NMOS Synchronous Buck
   Converter
• High-Accuracy Voltage and Current Regulation
   – ±0.5% Charge Voltage Accuracy
   – ±3% Charge Current Accuracy
   – ±3% Adapter Current Accuracy
• Integration
   – Automatic System Power Selection From
      Adapter or Battery
   – Internal Loop Compensation
   – Internal Soft Start
   – Dynamic Power Management
• Safety Protection
   – Input Overvoltage Protection
   – Battery Thermistor Sense Hot/Cold Charge
      Suspend
   – Battery Detection
   – Reverse-Protection Input FET
   – Programmable Safety Timer
   – Charge Overcurrent Protection
   – Battery Short Protection
   – Battery Overvoltage Protection
   – Thermal Shutdown
• Status Outputs
   – Adapter Present
   – Charger Operation Status
• Charge Enable Pin
• 6-V Gate Drive for Synchronous Buck Converter
• 30-ns Driver Dead-Time and 99.5% Maximum
   Effective Duty Cycle
• Energy Star Low Quiescent Current Iq
   – < 15-µA Off-State Battery Discharge Current
   – < 1.5-mA Off-State Input Quiescent Current

Applications
• Tablet PCs
• Smart Phones
• Portable Media Players, Navigation Devices,
   Notebooks and Ultra-Mobile PCs
• Personal Digital Assistants
• Handheld Terminals
• Industrial and Medical Equipment

Highly Integrated Narrow VDC Battery Charger for Notebook Computers

The ISL6257 is a highly integrated battery charger controller for Li-Ion/Li-Ion polymer batteries. ISL6257 is designed for Narrow VDC applications where the system power source is either the battery pack or the regulated output of the charger. This makes the max voltage to the system equal to the max battery voltage instead of the max adapter voltage. Operating at lower system voltage can improve overall efficiency. High efficiency is achieved in the charger with a synchronous buck topology. The low-side MOSFET emulates a diode at light loads to improve the light loadefficiency and prevent system bus boosting.

Features
• ±0.5% Charge Voltage Accuracy (-10°C to +100°C)
• ±3% Accurate Input Current Limit
• ±3% Accurate Battery Charge Current Limit
• ±25% Accurate Battery Trickle Charge Current Limit
• Programmable Charge Current Limit, Adapter Current Limit and Charge Voltage
• Fixed 300kHz PWM Synchronous Buck Controller with Diode Emulation at Light Load
• AC Adapter Present Indicator
• Fast Input Current Limit Response
• Input Voltage Range 7V to 25V
• Support 2, 3 and 4 Cells Battery Pack
• Up to 17.64V Battery-Voltage Set Point
• Control Adapter Power Source Select MOSFET
• Thermal Shutdown
• Aircraft Power Capable
• DC Adapter Present Indicator
• Battery Discharge MOSFET Control
• Less than 10µA Battery Leakage Current
• Support Pulse Charging
• Charge any Battery Chemistry: Li-Ion, NiCd, NiMH, etc.
• Pb-Free Plus Anneal Available (RoHS Compliant)

Applications
• Notebook, Desknote and Sub-notebook Computers
• Personal Digital Assistant