Overview
The BQ2031SN-A5TR, produced by Texas Instruments, is a Lead-Acid Fast-Charge IC designed to optimize the charging of lead-acid chemistry batteries. This integrated circuit utilizes a flexible pulse-width modulation regulator to control constant-voltage, constant-current, or pulsed-current charging. The switch-mode design minimizes power dissipation, making it suitable for high charge current applications. The BQ2031 starts a charge cycle when power is applied or the battery is replaced, ensuring safety by inhibiting charging until the battery voltage is within configured limits and the temperature is within the allowed range.
Key Specifications
| Parameter | Value | Unit | Notes |
|---|---|---|---|
| Package | SOIC (D) | - | 16 pins |
| Operating Temperature Range | -20 to 70 | °C | - |
| Supply Voltage (VCC) | 4.5 to 5.5 | V | Typical 5.0V ±10% |
| Internal Reference Voltage (VREF) | 2.20 | V | 1% at 25°C |
| Temperature Coefficient | -3.9 mV/°C | - | Normalized to 25°C |
| Charge Time-out Range (tMTO) | 1 to 24 hours | - | See Figure 9 |
Key Features
- Pin-selectable charge algorithms: Two-Step Voltage, Two-Step Current, and Pulsed Current
- Pin-selectable charge termination by maximum voltage, ∆2V, minimum current, and maximum time
- Pre-charge qualification detects shorted, opened, or damaged cells and conditions the battery
- Charging continuously qualified by temperature and voltage limits
- Internal temperature-compensated voltage reference
- Pulse-width modulation control
- Direct LED control outputs display charge status and fault conditions
- Ideal for high-efficiency switch-mode power conversion
- Configurable for linear or gated current use
Applications
The BQ2031SN-A5TR is designed for use in various battery charging applications, particularly those involving lead-acid chemistry batteries. It is suitable for cyclic and float charge applications, making it ideal for use in automotive systems, industrial power backup systems, and other battery-powered devices that require efficient and safe charging.
Q & A
- What is the primary function of the BQ2031SN-A5TR? The primary function is to optimize the charging of lead-acid chemistry batteries using various charge algorithms.
- What types of charge algorithms does the BQ2031SN-A5TR support? It supports Two-Step Voltage, Two-Step Current, and Pulsed Current algorithms.
- How does the BQ2031SN-A5TR ensure safety during charging? It inhibits charging until the battery voltage is within configured limits and the temperature is within the allowed range.
- What is the operating temperature range of the BQ2031SN-A5TR? The operating temperature range is -20 to 70°C.
- How is the charge termination determined in the BQ2031SN-A5TR? Charge termination is determined by maximum voltage, ∆2V, minimum current, and maximum time.
- Does the BQ2031SN-A5TR support temperature compensation? Yes, it includes an internal temperature-compensated voltage reference.
- What is the purpose of the MOD output in the BQ2031SN-A5TR? The MOD output is used to control the charging current to the battery.
- How does the BQ2031SN-A5TR detect battery presence or absence? It detects battery presence or absence based on the voltage at the BAT pin, which must be between the High-Voltage Cutoff (VHCO) and the Low-Voltage Cutoff (VLCO) thresholds.
- What happens if the battery voltage is less than the low-voltage threshold? The BQ2031SN-A5TR provides trickle-current charging until the voltage rises into the allowed range or an internal timer runs out and places the device in a Fault condition.
- Can the BQ2031SN-A5TR be configured for different charge display modes? Yes, it supports different charge display modes controlled by the DSEL input.
