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Battery Management Solutions
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High Performance Analog ICs ^^^F TECHNOLOGY

Battery-Fed (Charger-Fed) Systems First generation USB system applications incorporated a current- limited battery charger directly between the USB port and the battery (see Figure 1). In this battery-fed topology, the battery directly powers the system and the power available to the system because VBAT is the only voltage available to the system load. For linear chargers, input current approximately equals charge current, so a simple current limit is sufficient. Connecting the system load directly to the battery eliminates the need for a load sharing diode. Disadvantages of this topology...

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T O P O L O G Y O V E R V I E W — P O W E R PAT H C O N T R O L A N D B AT T E RY- F E D S Y S T E M S Switch Mode PowerPath Power Managers Third generation USB charging systems feature a switch mode-based topology (see Figure 3). This type of PowerPath device produces an intermediate bus voltage from a USB-compliant step-down switching regulator that regulates a small differential voltage above the battery voltage. Linear Technology refers to this as Bat-Track™ adaptive output control because the output voltage tracks the battery voltage. The differential voltage between the battery and...

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External High Voltage Switching Regulator Control Several Linear Technology power manager ICs (both linear and switching) provide the ability to adaptively control the output of an external high voltage switching regulator (see Figure 4). The WALL pin detects the presence of a high voltage supply (e.g., car battery, 12V wall adapter, FireWire input) and enables Bat-Track adaptive output control via the buck regulator's Vc pin. Similar to a switching PowerPath system, the output of the high voltage buck is regulated to a small differential voltage above the battery voltage with a minimum...

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Linear Li-Ion/Polymer Battery Chargers We produce a comprehensive line of high performance battery chargers for any rechargeable battery chemistry, including lithium-ion, lithium-polymer, lead acid, and nickel-based. Our linear battery charger ICs are completely autonomous in operation and offer many standard features for battery safety and management, including on-chip battery preconditioning, status signaling, thermal regulation LTC®4095: USB Li-Ion/Polymer Battery Charger in 2mm x 2mm DFN LTC4095: Actual Size Demo Circuit 500mA Single Cell Li-Ion Charger LTC4078/X: Dual Input...

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* USB 2,0 Compatible, t Onboard Comparator, t Constant-Current Mode (Voltage Mode Disabled), § Onboard LDO, H "X" (No Trickle Charge) Versions Useful when the System Load Exceeds the Trickle Charge Current at Very Low Battery Voltages # Pulse Charger

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Low Current/Coin Cell Battery Chargers Our coin cell battery chargers enable highly accurate charging of low capacity, charge-sensitive coin cells used in thin, compact devices such as Bluetooth headsets and hearing aids. LTC4054L: 150mA Standalone Li-Ion Battery Charger for LTC4065L: 250mA Standalone Linear Li-Ion Battery Charger in 90mA Li-Ion Coin Cell Charger Standalone Li-Ion Charger Actual Size Demo Circuit LTC4054L Complete Charge Cycle TIME (HOURS) LTC4065L Complete Charge Cycle * "X" (No Trickle Charge) Versions Useful when the System Load Exceeds the Trickle Charge Current at Very...

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N i M H & N i C d B AT T E RY C H A R G E R S NiMH/NiCd NiMH and NiCd Battery Chargers Our nickel battery chargers reduce component count, speed design and allow fast, accurate and reliable charging of both NiMH and NiCd cells. LTC4060: LTC4011: Actual Size Demo Circuit Actual Size Demo Circuit LTC4011: High Efficiency 4A Standalone Switch Mode Battery Charger with Analog INFET Control LTC4060: Standalone 2A Linear NiMH/NiCd Fast Battery Charger VIN = 5V 330Ω VCC SHDN ACP CHRG SENSE NTC “CHARGE” DRIVE LTC4011 LTC4060 NTC PROG 698Ω + BAT ARCT TIMER SEL0 CHEM SEL1 PAUSE GND NiMH BATTERY 1.5nF...

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USB Power Managers: Battery Chargers with PowerPath Control PowerPath products and architectures permit the load to be powered from both V|N and the battery, enabling shorter charge time, instant-on operation (even with a dead or missing battery) and more flexibility for the portable device designer. Other key features include standalone operation and thermal regulation. LTC4098/-1: USB Power Manager with Overvoltage Protection OVSENS IDGATE CLPROG PROG GND BATSENS High Efficiency USB/Automotive Power Manager with Overvoltage Protection Actual Size Demo Circuit Actual Size Demo Circuit...

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PMICs: Switch Mode Power Manager-Based Our power management integrated circuits (PMICs) address battery charging and multiple system power rail needs for single-cell lithium-ion/polymer portable products. Switch mode power management enables higher efficiency charging, less heat dissipation and compatibility with wall adapter, USB and high voltage power sources. LTC3556: High Efficiency Switch Mode USB Power Manager + Battery Charger + Dual Step-Down DC/DC + Buck-Boost + LDO Power Manager • High Efficiency Switching PowerPath Controller with Bat-Track Adaptive Output Control • Programmable...

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PMICs: Linear Power Manager-Based Our power management integrated circuits (PMICs) address battery charging and multiple system power rail needs in single-cell lithium- ion/polymer portable products. Linear power management allows seamless transition and manages power flow between input power sources such as a wall adapter, USB port, lithium battery and the system load. LTC3577/-1: Highly Integrated 6-Channel PMIC Full Featured Li-Ion Charger/PowerPath Controller with Instant-On Operation High Temperature Battery Voltage Reduction Improves Safety and 1.5A Maximum Charge Current with Thermal...

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PMICs: Linear Battery Charger (Battery-Fed) Our power management integrated circuits (PMICs) address battery charging and multiple system power rail needs in single-cell lithium portable products. A high level of integration is offered in a small footprint for a compact total solution size and ease-of-use. LTC3558: Linear USB Battery Charger with Buck-Boost and Buck Regulators Power Manager • Up to 950mA Charge Current Programmable via Single Resistor • HPWR Input Selects 20% or 100% of Programmed Charge Current • NTC Input for Temperature Qualified Charging • Internal Timer Termination...

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