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Analog Devices Inc. LTC1444IDHD#PBF
- Part No.:
- LTC1444IDHD#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Comparators
- Package:
- 16-WFDFN Exposed Pad
- Datasheet:
-
LTC1444IDHD#PBF.pdf
- Description:
- IC COMPARATOR 4 W/VOLT REF 16DFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,625
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Product details
Overview
LTC1444IDHD#PBF from Analog Devices (formerly Linear Technology) is an ultralow power quad comparator IC with integrated 1.221V ±1% voltage reference and programmable hysteresis. It features 8.5µA max supply current, open-drain outputs referenced to V–, and operates from single 2V–11V or dual ±1V–±5.5V supplies. Used in battery-powered threshold detection where precision, low quiescent current, and stable reference are critical.
For engineers reviewing the LTC1444IDHD#PBF datasheet, LTC1444IDHD#PBF pinout, LTC1444IDHD#PBF application, or LTC1444IDHD#PBF equivalent, key selection criteria include its 1.221V reference accuracy over –40°C to +85°C, HYST pin-based hysteresis programming, open-drain output compatibility with mixed-voltage systems, and DFN-16 (5mm × 4mm) thermal performance with exposed V– pad.
Technical Context
The LTC1444IDHD#PBF implements four independent comparators sharing a single internal bandgap reference. Its HYST pin enables precise hysteresis control via external resistors-voltage difference between REF and HYST sets the hysteresis band (max 100mV), with no internal hysteresis defaulting when HYST = REF.
Input common-mode range extends from V– to V+ – 1.3V, supporting rail-to-rail sensing in low-voltage systems. Open-drain outputs sink up to 5mA and tolerate voltages up to (V+ + 0.3V), enabling level-shifting and wired-OR configurations without external pull-ups required for V–-referenced loads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Current | 8.5µA max over –40°C to +85°C - enables multi-year operation on coin-cell batteries |
| Reference Voltage | 1.221V ±1% (C temp), ±1.5% (I temp) - provides stable trip point without external reference |
| Propagation Delay | 14µs typical at 10mV overdrive - balances speed and ultralow power in slow-signal monitoring |
| Input Offset Voltage | ±10mV max - ensures reliable detection of small differential signals near reference |
| Input Leakage Current | ±1nA max - minimizes error in high-impedance sensor interfaces (e.g., thermistors) |
| Output Type | Open-drain to V– - supports flexible termination, negative rail logic, and fault-safe sinking |
| Reference Load Drive | Sinks 15µA / sources 200µA - drives 0.01µF bypass cap directly without oscillation |
Pinout & Package
Package: 16-lead DFN (5mm × 4mm, 0.8mm height), exposed pad internally connected to V– for thermal enhancement.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OUT B (1) | Comparator B open-drain output | Sinks up to 5mA; requires external pull-up for logic-high assertion |
| OUT A (2) | Comparator A open-drain output | Same as OUT B; enables independent control of two thresholds |
| V+ (3) | Positive supply input | Accepts 2V–11V single or ±1V–±5.5V dual supply; bypass with 0.1µF recommended |
| IN A– (4) | Inverting input of comparator A | Common-mode range: V– to V+ – 1.3V; leakage ≤ ±1nA enables high-Z dividers |
| IN A+ (5) | Noninverting input of comparator A | Matches IN A– specs; used with REF for fixed-threshold detection |
| HYST (14) | Hysteresis control input | Accepts voltage from REF – 50mV to REF; sets hysteresis band = 2×(REF – HYST) |
| REF (8) | 1.221V reference output | Referenced to V–; drives 0.01µF cap directly; source/sink capability supports local regulation |
| V– (9) | Negative supply / ground reference | Connect to system ground for single-supply use; exposed pad tied internally |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow quiescent current | 8.5µA max across full temperature range - extends battery life in always-on sensors |
| Programmable hysteresis | Configurable 0–100mV input hysteresis via two external resistors - eliminates false triggering in noisy environments |
| Integrated 1.221V reference | ±1% initial accuracy, ±1.5% over –40°C to +85°C - removes need for external reference IC or precision resistor network |
| Open-drain outputs | Compatible with V–-referenced loads and mixed-voltage buses - simplifies interface to microcontrollers or FPGAs with different I/O rails |
| Wide supply range | Operates from 2V to 11V single supply - supports direct connection to Li-ion, alkaline, or regulated 3.3V/5V rails |
Applications
| Battery Voltage Monitor | Multi-Supply Level Detector |
|---|---|
Use Scenario: Monitoring lithium-ion cell voltage during charge/discharge cycles in portable medical devices. IC Role / Device Role / Timing Role: Quad comparator compares cell voltage against 1.221V reference scaled by resistor dividers to detect under-voltage (2.8V) and over-voltage (4.3V) thresholds. Use Value: 8.5µA quiescent current enables continuous monitoring without depleting standby battery; open-drain outputs interface directly to MCU wake-up pins. | Use Scenario: Detecting valid operating voltage across three independent power rails (3.3V, 5V, 12V) in industrial PLC backplanes. IC Role / Device Role / Timing Role: Each comparator monitors one rail using REF-based divider; HYST pin configures 50mV hysteresis per rail to reject supply ripple. Use Value: Single IC replaces four discrete comparators + reference; DFN package saves board space in dense control modules. |
| Window Comparator | Oscillator Circuit |
Use Scenario: Validating sensor output stays within safe operational bounds (e.g., pressure transducer output 0.5–4.5V). IC Role / Device Role / Timing Role: Two comparators form upper/lower limits using REF and resistor networks; third comparator combines outputs via wired-AND to generate fault flag. Use Value: Programmable hysteresis prevents chatter at window edges; 1.221V reference ensures consistent trip points across temperature. | Use Scenario: Building a low-power relaxation oscillator for real-time clock backup in energy-harvesting nodes. IC Role / Device Role / Timing Role: One comparator charges/discharges capacitor through REF and HYST feedback; oscillation frequency set by RC time constant and hysteresis band. Use Value: Eliminates external reference IC; 8.5µA supply current allows oscillator to run indefinitely on harvested microwatts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad comparator with reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC1444IS#PBF | SO-16 package, same electrical specs, θJA = 150°C/W vs DFN's 41.7°C/W | Less thermal efficiency; suitable for lower-power or less space-constrained designs | Select for legacy SO footprint compatibility or simplified reflow process |
| LTC1445IS#PBF | TTL/CMOS push-pull outputs (not open-drain); identical reference and hysteresis | Requires no external pull-ups; incompatible with V–-terminated loads or wired-OR logic | Choose when driving standard logic inputs directly without level-shifting |
Compared with LTC1444IS#PBF, the LTC1444IDHD#PBF offers superior thermal performance in compact layouts, while LTC1445IS#PBF trades open-drain flexibility for simpler interfacing-selection depends on output load topology and board area constraints.
Availability
LTC1444IDHD#PBF is available at Aetrix Electronics and suitable for battery-powered system monitoring, threshold detectors, window comparators, and oscillator circuits requiring stable component supply across industrial temperature ranges.
Supply support for LTC1444IDHD#PBF includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Analog Devices acquired Linear Technology in 2017 and maintains its precision analog portfolio, emphasizing high-performance signal conditioning and power management ICs for demanding industrial and automotive applications.
The LTC144x family was designed specifically for ultralow-power sensing and monitoring in portable and energy-constrained systems, integrating reference, hysteresis control, and robust input/output architecture in minimal footprint packages.
FAQ
What is the reference voltage tolerance of the LTC1444IDHD#PBF over temperature?
The LTC1444IDHD#PBF features a 1.221V reference with ±1% initial accuracy at 25°C and ±1.5% maximum deviation over the full –40°C to +85°C industrial temperature range, as specified in the Electrical Characteristics table under "VREF No Load, LTC1444/LTC1445 I Temp Range." This stability enables reliable threshold setting without calibration.
Can the LTC1444IDHD#PBF operate from a single 3.3V supply?
Yes, the LTC1444IDHD#PBF supports single-supply operation from 2V to 11V. At 3.3V, it delivers 8.5µA max supply current and maintains full functionality-including REF output, HYST-controlled hysteresis, and open-drain outputs sinking to V– (ground). Input common-mode range spans 0V to 2.0V (V+ – 1.3V), accommodating typical 3.3V sensor outputs.
How is hysteresis programmed on the LTC1444IDHD#PBF?
Hysteresis is programmed by connecting a resistor (R1) between REF and HYST pins, and a second resistor (R2) from HYST to V–. The hysteresis voltage band equals twice the voltage difference between REF and HYST, with a maximum of 100mV. If unused, HYST must be shorted to REF to disable hysteresis-no internal default hysteresis exists.
What is the purpose of the exposed pad on the LTC1444IDHD#PBF DFN package?
The exposed pad (Pin 17) on the LTC1444IDHD#PBF is internally connected to V– and serves as a thermal conduction path. Soldering it to a PCB copper pour significantly reduces θJA from 41.7°C/W to ~30°C/W, improving reliability in sustained-output or high-ambient-temperature applications-no electrical connection beyond V– is required.
Does the LTC1444IDHD#PBF require external components for stable reference operation?
The LTC1444IDHD#PBF reference can drive up to a 0.01µF bypass capacitor directly without oscillation, eliminating mandatory external compensation. For larger capacitors (up to 100µF), a series damping resistor (e.g., 430Ω for 1µF) is required per Figure 2 in the datasheet-no additional active components are needed for basic stability.
LTC1444IDHD#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Package/Case:
- 16-WFDFN Exposed Pad
- Series:
- -
- Packaging:
- Tube
- Product Status:
- Active
- Type:
- with Voltage Reference
- Number of Elements:
- 4
- Output Type:
- CMOS, Open-Drain, TTL
- Voltage - Supply, Single/Dual (±):
- 2V ~ 11V, ±1V ~ 5.5V
- :
- 10mV @ 5V
- Voltage - Input Offset (Max):
- -
- Current - Input Bias (Max):
- 0.015mA @ 5V
- Current - Output (Typ):
- 8.5µA
- Current - Quiescent (Max):
- 80dB CMRR, 80dB PSRR
- CMRR, PSRR (Typ):
- 12µs
- Propagation Delay (Max):
- 50mV
- Hysteresis:
- -40°C ~ 85°C
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- Surface Mount
- :
- 16-DFN (5x4)
LTC1444IDHD#PBF FAQ
1.How can I place an order for LTC1444IDHD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1444IDHD#PBF on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LTC1444IDHD#PBF reliable?
The price and inventory of LTC1444IDHD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1444IDHD#PBF is usually 5 days.
3.What payment methods are accepted for LTC1444IDHD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1444IDHD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1444IDHD#PBF?
LTC1444IDHD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1444IDHD#PBF order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LTC1444IDHD#PBF?
For technical support, including LTC1444IDHD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1444IDHD#PBF requirements.
6.How does Aetrix verify that LTC1444IDHD#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1444IDHD#PBF products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LTC1444IDHD#PBF meets industry standards.
7.What is the process for return or replacement of LTC1444IDHD#PBF?
All LTC1444IDHD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1444IDHD#PBF, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LTC1444IDHD#PBF part is unused and in its original packaging.
Return procedure for LTC1444IDHD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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