LTC1555IGN

Product Overview

• Category: Integrated Circuit (IC)
• Use: Battery Charger Controller
• Characteristics: High Efficiency, Low Quiescent Current
• Package: 16-Lead SSOP
• Essence: Regulates and Controls Battery Charging Process
• Packaging/Quantity: Tape & Reel, 2500 units per reel

Specifications

• Input Voltage Range: 4.5V to 20V
• Charge Voltage Accuracy: ±1%
• Charge Current Accuracy: ±5%
• Operating Temperature Range: -40°C to 85°C
• Quiescent Current: 30µA (typical)

Detailed Pin Configuration

The LTC1555IGN has a 16-lead SSOP package with the following pin configuration:

1. VCC: Power Supply Input
2. GND: Ground
3. PROG: Charge Current Programming Pin
4. STAT: Status Output Pin
5. EN: Enable Pin
6. TS: Temperature Sense Input
7. BAT: Battery Connection
8. VFB: Feedback Voltage Input
9. ISET: Charge Current Setting Pin
10. TIMER: Timer Control Pin
11. SENSE: Current Sense Input
12. NC: No Connection
13. NC: No Connection
14. NC: No Connection
15. NC: No Connection
16. NC: No Connection

Functional Features

• Accurate Constant Current and Constant Voltage Charging
• Programmable Charge Current and Timer
• Automatic Trickle Charge for Low Battery Conditions
• Thermal Regulation and Protection
• Status Indication for Charge Complete or Fault Conditions

Advantages and Disadvantages

Advantages: - High charging efficiency - Low quiescent current consumption - Accurate charge voltage and current control - Programmable charge current and timer for flexibility - Built-in thermal regulation and protection

Disadvantages: - Limited to 16-lead SSOP package - Requires external components for complete battery charging circuit

Working Principles

The LTC1555IGN is a battery charger controller IC that regulates and controls the charging process of batteries. It operates by monitoring the battery voltage, current, and temperature to ensure safe and efficient charging. The IC provides constant current charging until the battery voltage reaches a predetermined level, after which it switches to constant voltage mode. The charge current and timer can be programmed to suit different battery types and capacities.

Detailed Application Field Plans

The LTC1555IGN is commonly used in various portable electronic devices such as smartphones, tablets, digital cameras, and portable power banks. It is suitable for charging lithium-ion (Li-Ion) and lithium-polymer (Li-Po) batteries. The IC's high efficiency and low quiescent current make it ideal for battery-powered applications where energy efficiency is crucial.

Detailed and Complete Alternative Models

1. LTC1556IGN: Similar to LTC1555IGN with additional features for multi-cell battery charging.
2. LTC1557IGN: Low-power version of LTC1555IGN with reduced quiescent current for ultra-low power applications.
3. LTC1558IGN: High-power version of LTC1555IGN capable of charging larger capacity batteries.

These alternative models offer similar functionality to the LTC1555IGN but may have additional features or variations to suit specific application requirements.

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