Overview
The LTC2949HLXE#3ZZPBF is a high-precision current, voltage, temperature, charge, and energy meter integrated circuit designed by Analog Devices Inc. This component is specifically tailored for electrical and hybrid vehicles, as well as other isolated current sense applications. It accurately measures and monitors the voltage drop over up to two sense resistors and the battery pack voltage, enabling precise inference of charge and energy flow in and out of the battery pack.
Key Specifications
| Parameter | Conditions | Min | Typ | Max | Units |
|---|---|---|---|---|---|
| Energy Measurement TUEE | 1V ≤ |VDIFV| ≤ 4.8V, 25mV ≤ |VDIFI| ≤ 110mV | 0.9% | - | 1% | - |
| Reference Voltages VREF | - | - | 3 V | - | V |
| Reference Voltages VREF Error | - | - | ±1% | - | - |
| Reference Voltages VREF Temperature Coefficient | - | - | 7 ppm/K | - | - |
| Operating Temperature Range | - | -40°C | - | 125°C | °C |
| Package Type | - | - | 48-LEAD PLASTIC eLQFP | - | - |
Key Features
- High-precision measurement of current, voltage, temperature, charge, and energy for battery packs in electrical and hybrid vehicles.
- Simultaneous monitoring of voltage drop over up to two sense resistors and battery pack voltage.
- Low offset ΔΣ ADCs for accurate measurements with minimal power loss.
- Continuous integration of current and power for lossless tracking of charge and energy.
- Isolated isoSPI communication interface for secure data transfer.
- 12 internally buffered high impedance inputs for measuring voltages from external sensors or resistor dividers.
Applications
- Electrical and hybrid vehicles.
- Isolated current sense applications.
- Battery management systems for high-voltage battery packs.
- Monitoring of temperatures, HV-Link voltages, chassis isolation, and contactor states.
Q & A
- What is the primary function of the LTC2949HLXE#3ZZPBF? The primary function is to measure current, voltage, temperature, charge, and energy in high-voltage battery packs.
- What type of ADCs does the LTC2949 use? The LTC2949 uses low offset ΔΣ ADCs.
- What is the operating temperature range of the LTC2949HLXE#3ZZPBF? The operating temperature range is from -40°C to 125°C.
- What package type is the LTC2949HLXE#3ZZPBF available in? It is available in a 48-LEAD PLASTIC eLQFP package.
- Does the LTC2949 support isolated communication? Yes, it supports isolated isoSPI communication.
- How many high impedance inputs does the LTC2949 have? It has 12 internally buffered high impedance inputs.
- What is the typical reference voltage (VREF) of the LTC2949? The typical reference voltage (VREF) is 3 V.
- What is the energy measurement total unadjusted error (TUEE) of the LTC2949? The energy measurement TUEE is 0.9% to 1% under specified conditions.
- Can the LTC2949 be used in automotive applications? Yes, it is available in automotive-grade versions designated with a #3ZZ suffix.
- What other parameters can the LTC2949 monitor besides current and voltage? Besides current and voltage, it can monitor temperature, HV-Link voltages, chassis isolation, and contactor states.
