| Allicdata Part #: | LTC1734LES6-4.2#TRPBF-ND |
| Manufacturer Part#: |
LTC1734LES6-4.2#TRPBF |
| Price: | $ 1.18 |
| Product Category: | Integrated Circuits (ICs) |
| Manufacturer: | Linear Technology/Analog Devices |
| Short Description: | IC BATT CHRGR LI-ION LIN SOT23-6 |
| More Detail: | Charger IC Multi-Chemistry TSOT-23-6 |
| DataSheet: |  LTC1734LES6-4.2#TRPBF Datasheet/PDF |
| Quantity: | 1000 |
| 1 +: | $ 1.18000 |
| 10 +: | $ 1.14460 |
| 100 +: | $ 1.12100 |
| 1000 +: | $ 1.09740 |
| 10000 +: | $ 1.06200 |
| Series: | -- |
| Packaging: | Tape & Reel (TR) |
| Part Status: | Active |
| Battery Chemistry: | Multi-Chemistry |
| Number of Cells: | 1 |
| Current - Charging: | Constant - Programmable |
| Programmable Features: | Current |
| Fault Protection: | Over Current, Over Temperature |
| Charge Current - Max: | 180mA |
| Battery Pack Voltage: | 4.2V |
| Voltage - Supply (Max): | 8V |
| Interface: | -- |
| Operating Temperature: | -40°C ~ 85°C (TA) |
| Package / Case: | SOT-23-6 Thin, TSOT-23-6 |
| Supplier Device Package: | TSOT-23-6 |
| Base Part Number: | LTC1734 |
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LTC1734LES6-4.2#TRPBF application field and working principle
The LTC1734LES6-4.2#TRPBF is a Li-ion cell charger and system power manager with integrated switching and sequencing control. The device is especially suited for low-power system with one or two cell Li-ion batteries.
The LTC1734LES6-4.2#TRPBF is a highly integrated power management and battery charging solution, specificially designed for use with Li-ion and Li-polymer batteries. It integrates an LDO and two switching converters and offers high efficiency, low quiescent current, and low noise operation. In addition, it is highly integrated with system power and charging related features, such as adjustable charging current, programmable voltage clamp, programmable charge cycles, battery temperature monitoring, and smart cell balancing.
The LTC1734LES6-4.2#TRPBF integrates two P-channel MOSFETs and two regulators to provide a charger and system power manager with integrated switching and sequencing control. The device is ideal for powering low-power system with one or two cell Li-ion or Li-polymer batteries. It is capable of delivering up to 4.2A of charge current. The system also features programmable under-voltage and over-voltage protection settings.
Application Field
The LTC1734LES6-4.2#TRPBF is primarily suited for handheld and portable applications, such as cellphones and PDAs, but may also be used in other applications that require power management and high efficiency charging. Because it includes advanced features such as charge current adjustment and system voltage and current monitoring, the device is especially suitable for applications that require advanced system level intelligence and control.
Working Principle
The LTC1734LES6-4.2#TRPBF consists of two main components: a system power management block and a battery charger block. The system power management block is responsible for providing regulated system voltage and current, while the battery charger block is responsible for charging the Li-ion cell. Both blocks are connected to an external Li-ion cell or battery as well as an external voltage source.
The system power management portion of the device consists of two power control circuits that regulate the output voltage and current. The first circuit is a linear low-dropout (LDO) regulator, while the second is a switching power supply. The LDO provides adjustable regulation from 2.5V to 5.5V, and the switching power supply is capable of converting up to 5.2V to 3.4V with up to 4.2A of output current. Both circuits are controlled by a programmable digital control section.
The battery charger portion of the device contains a buck converter that is capable of charging the Li-ion battery at up to 4.2A. The charger includes an adjustable output voltage, current limit, and a programmable charge cycle. The device also incorporates temperature monitoring, cell balancing, and programmable over-voltage and under-voltage protection settings. Additionally, the device can be used in autonomous “sleep” and “shutdown” modes to save power and maximize charge cycles.
Conclusion
The LTC1734LES6-4.2#TRPBF is a highly integrated lithium-ion cell charger and power management solution tailored for portable and handheld applications. It provides a linear low-dropout regulator, a buck converter, temperature monitoring, charge scheduling, and system voltage and current monitoring. With its ultra-low quiescent current and high efficiency charging capabilities, the device is well suited for low-power applications requiring advanced system level intelligence and control.