会社ブログについて TI TLV1805 High Voltage Comparator With Push-Pull Output And Shutdown

Shenzhen Mingjiada Electronics Co., Ltd. supplies the TI TLV1805 high-voltage comparator, featuring push-pull output and a shutdown function.

I. TLV1805 Product Details

1. TLV1805 Product Description

The TLV1805 is a single-channel high-voltage comparator from TI. Its key features include a wide supply voltage range, rail-to-rail inputs, high-peak-current push-pull outputs and a dedicated shutdown pin. It integrates a power-on reset (POR) function and built-in hysteresis, balancing response speed, drive capability and low power consumption. It is specifically designed for high-side detection, power protection and direct MOSFET drive applications. Unlike traditional open-drain comparators, the push-pull output eliminates the need for pull-up resistors and can directly drive the gate of a power transistor; in the off state, the output enters a high-impedance state, making it suitable for multi-device parallel configurations, time-division control and low-power sleep modes. It is widely applicable to high-voltage signal detection chains in industrial power supplies, battery management and automation equipment.

2. TLV1805 Key Specifications

- Supply voltage range: 3.3 V to 40 V

- Number of channels: Single channel

- Output architecture: Push-pull output

- Typical quiescent current: 135 µA

- Propagation delay: 250 ns

- Typical input offset voltage: 500 µV

- Built-in hysteresis: 14 mV

- Input common-mode: Rail-to-rail input with built-in phase-reversal protection

- Shutdown characteristics: Controlled via the SHDN pin; output enters a high-impedance state upon shutdown

- Operating temperature range: –40°C to +125°C

- Power-on reset (POR): Locks the output during device power-up to prevent false triggering

- Mainstream package: SOT-23 (TLV1805DBVR)

- Compliance: RoHS and REACH compliant, industrial grade; an automotive-grade version, the TLV1805-Q1, is also available

3. TLV1805 Product Features

1. 40 V high-voltage, wide-range power supply, supporting 24 V industrial bus, multi-cell lithium-ion battery packs and high-side sampling and monitoring

2. High-peak-current push-pull output eliminates the need for external pull-up resistors and can directly drive the gates of N-channel and P-channel MOSFETs, simplifying the BOM

3. Rail-to-rail input with phase-reversal protection; no output latching or reverse false triggering occurs when the input exceeds the common-mode range

4. Built-in 14mV hysteresis suppresses input noise jitter and reduces the need for external hysteresis resistor design

5. Dedicated shutdown control pin; high-impedance output in sleep mode, facilitating system zone power-off and multiplexing with comparators

6. Fast propagation delay of 250 ns, suitable for fast protection circuits such as overvoltage, overcurrent and reverse current protection

7. Low quiescent current of 135 µA, suitable for battery-powered detection units requiring extended standby periods

8. Integrated power-on reset (POR) function; output state is controllable during power-up to prevent false protection during the initial power-up phase

9. Compact SOT-23 package saves PCB layout space and is suitable for compact control board designs

4. TLV1805 Typical Applications

- Overvoltage, undervoltage and overcurrent protection circuits in power supply systems

- Smart diodes and reverse current backflow prevention control circuits

- High-voltage signal threshold detection and fault alarms in industrial automation equipment

- High-voltage sampling and balancing control in Battery Management Systems (BMS)

- Secondary-side fault detection in DC-DC and isolated power supplies

- Gate drive control for relays and power switches

- Suitable for automation equipment applications; may also be used for signal discrimination in non-automotive high-voltage industrial control and energy storage data acquisition boards

II. TLV1805 Procurement, Selection and Buyer’s Guide

1. Key Considerations for Selection

1. Supply voltage compatibility: Where the bus voltage exceeds 3.3V but does not exceed 40V, and direct drive of MOSFET gates is required, the TLV1805 should be the preferred choice; If the application involves logic-level detection only and does not require push-pull driving, open-drain comparators may be considered as an alternative.

2. Shutdown Functionality Requirements: Where the system requires time-division activation, sleep mode power-off, or multi-channel signal polling, the TLV1805 with an SHDN shutdown pin must be selected; if no sleep mode is required, non-shutdown variants within the same series may be evaluated.

3. Temperature and Grade Classification: For standard industrial control, energy storage and general automation projects, select the industrial-grade TLV1805; for automotive and ADAS-related applications, select the TLV1805-Q1 automotive-grade version; the two are not directly interchangeable.

4. Package Selection: For mass production, the standard choice is SOT-23 (DBVR), which offers good availability and mature assembly processes; confirm PCB pad compatibility before finalising the part number suffix.

5. Noise and Response Speed: Where input signal noise is high, utilise the built-in 14 mV hysteresis; if faster protection action is required, prioritise confirming whether the 250 ns propagation delay meets the protection window requirements.

2. Guidance on Avoiding Procurement Pitfalls

1. Part Number Suffix Verification: TLV1805DBVR and TLV1805DBVRG4 are versions with different suffixes; there are differences in packaging, tape labelling and batch management. When placing orders, ensure the full part number is strictly matched to avoid incorrect shipments due to substitution.

2. Distinguish between refurbished/loose new and original components: As this device is an analogue signal chain IC, refurbished or salvaged components are prone to offset drift, failure of the shutdown function and delay parameter exceedances; the use of non-original components in protection circuits is strictly prohibited.

3. Warning regarding substitution risks: Do not directly substitute with standard, generic comparators. Standard models typically feature open-drain outputs, which cannot directly drive MOSFETs, and lack phase-reversal protection and high-impedance shutdown characteristics; substitution may result in false protection triggers.

4. Sample and volume order timing: For initial hardware validation, request samples first; finalise volume orders only after completing high- and low-temperature, overvoltage surge, and shutdown/start-up tests. For long-term projects, secure a safety stock in advance to mitigate fluctuations in TI’s lead times.

5. Documentation Verification: Upon receipt, verify the batch label, date of manufacture (D/C), and original manufacturer’s traceability information; simultaneously verify the MSL class. The reflow soldering process must be strictly carried out in accordance with Class 1 moisture-sensitive device specifications.

III. Mingjiada Electronics — TLV1805 Supply Quality and Delivery Assurance

Shenzhen Mingjiada Electronics is a long-term supplier of TI’s full range of signal chain and power management components, including the TLV1805 industrial-grade and TLV1805-Q1 automotive-grade comparators. We also offer a buy-back service for idle and end-of-line stock of the same brand, providing one-stop component solutions for hardware R&D, industrial control and energy storage equipment manufacturers.

Supply Quality Control

1. Controlled sourcing channels; we specialise in genuine, factory-sealed products. Each batch is inspected upon arrival to verify original factory packaging, laser-etched markings and batch traceability codes; we strictly reject refurbished, sanded-down or disassembled components passed off as new. For critical components such as the TLV1805, which are used for power protection, we conduct separate electrical spot checks, focusing on offset voltage, high-impedance off-state, output push-pull drive capability and propagation delay.

2. Comprehensive documentation is provided, including original manufacturer’s datasheets, RoHS/REACH reports and factory batch records, to meet the factory audit and compliance archiving requirements of clients in industrial control and energy storage projects.

3. Material storage adheres to anti-static and temperature/humidity control standards. SOT-23 packaged components are stored in separate tape-and-reel containers to prevent pin oxidation and electrostatic damage to analogue ICs, thereby ensuring electrical consistency of the components.

4. We support rapid verification of any anomalies in incoming materials; in the event of parameter discrepancies or packaging irregularities, we can swiftly coordinate returns, replacements and technical verification.

Delivery and Supporting Services

1. Regular stock availability: We maintain stock of standard specifications for the TLV1805DBVR; small-batch samples and medium-volume orders can be dispatched rapidly; for scarce batches, we can schedule orders in advance to secure stock, alleviating pressure on the original manufacturer’s lead times.

2. Flexible delivery options: We support express sample dispatch, loose tray shipments and tape-and-reel packaging to meet the requirements of different stages—from R&D prototyping and pilot testing to mass production; for long-term partners, we offer VMI consignment and batch-by-batch on-demand dispatch.

3. Technical Collaboration Support: We provide technical support for complementary analogue components, assisting customers in confirming peripheral circuit designs for the TLV1805’s hysteresis circuit, SHDN shutdown driver and MOSFET gate driver, whilst offering product selection comparisons and alternative evaluation recommendations.

4. Dual Business Model: In addition to supplying brand-new components from stock, we simultaneously purchase surplus stock and project offcuts from other brands, helping customers to utilise idle inventory and reduce overall supply chain costs.