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Analog Devices Inc. LTC1444IS#PBF
- Part No.:
- LTC1444IS#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Comparators
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1444IS#PBF.pdf
- Description:
- IC COMPARATOR 4 W/VOLT REF 16SO
- Quantity:
- Payment:
- Shipping:
Inventory:338
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Product details
Overview
LTC1444IS#PBF from Analog Devices (formerly Linear Technology) is an ultralow power quad comparator IC with integrated 1.221V ±1% precision reference and open-drain outputs referenced to V–. It draws ≤8.5µA supply current over temperature, operates from 2V to 11V single or ±1V to ±5.5V dual supplies, supports programmable hysteresis via the HYST pin, and features rail-to-rail input range down to V–. It is used in battery-powered voltage monitoring and threshold detection where quiescent current and reference stability are critical.
For engineers reviewing the LTC1444IS#PBF datasheet, LTC1444IS#PBF pinout, LTC1444IS#PBF application, or LTC1444IS#PBF equivalent, key selection criteria include its open-drain output architecture (V–-referenced), 1.221V internal reference accuracy, programmable hysteresis capability, −40°C to +85°C industrial temperature rating, and SO-16 package compatibility with legacy designs.
Technical Context
The LTC1444IS#PBF implements four independent comparators sharing a common 1.221V bandgap reference, with each input operating from V– to (V+ − 1.3V). Its open-drain output stage sinks up to 5mA and is designed for level-shifting applications requiring V–-referenced logic transitions - unlike the TTL/CMOS-sourcing LTC1443/LTC1445 variants.
Hysteresis is implemented externally via two resistors between REF and HYST pins, enabling precise control of the hysteresis voltage band (up to 100mV max) without internal feedback paths. The reference output drives up to 0.01µF bypass capacitors without oscillation, supporting stable operation in noise-sensitive sensing circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Current | ≤8.5µA max over −40°C to +85°C - enables multi-year battery life in always-on sensor nodes |
| Reference Voltage | 1.221V ±1% (C temp), ±1.5% (I temp) - provides stable threshold for precision level detection |
| Input Common Mode Range | V– to (V+ − 1.3V) - supports direct sensing of signals near ground or negative rails |
| Propagation Delay | 14µs typical (10mV overdrive, 100pF load) - balances speed and ultralow power consumption |
| Output Type | Open-drain, V–-referenced - allows flexible pull-up to any logic rail or voltage domain |
| Hysteresis Control | Programmable via HYST pin (REF − 50mV to REF) - enables robust noise immunity without external op-amps |
| Input Leakage Current | ±0.02nA typical at 25°C - minimizes error in high-impedance divider networks |
Pinout & Package
Package: 16-pin Plastic Small Outline (SO-16), 150°C/W θJA, industrial temperature grade (−40°C to +85°C).
| 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; independent control per channel |
| V+ (3) | Positive supply rail | Accepts 2V–11V single or ±1V–±5.5V dual supply |
| IN A– (4) | Inverting input of Comparator A | Rail-to-rail capable down to V–; 10pA leakage enables high-Z dividers |
| IN A+ (5) | Noninverting input of Comparator A | Same specs as IN A–; differential pair input stage |
| HYST (14) | Hysteresis control input | Accepts voltage from REF − 50mV to REF; sets hysteresis band width |
| REF (8) | 1.221V reference output | Stable bandgap source/sink (200µA/15µA); drives 0.01µF directly |
| V– (9) | Negative supply rail | Reference for open-drain outputs and comparator inputs; tied to GND in single-supply use |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow quiescent current | 8.5µA max over full industrial temperature range - extends shelf life and runtime in coin-cell systems |
| Integrated precision reference | 1.221V ±1% initial accuracy, ±1.5% over −40°C to +85°C - eliminates external reference IC and trimming |
| Programmable hysteresis | Adjustable 0–100mV hysteresis band using two external resistors - prevents chatter in noisy analog environments |
| Open-drain V–-referenced outputs | Enables level translation to arbitrary logic rails (e.g., 1.8V, 3.3V, 5V) without additional interface circuitry |
| Wide supply range | 2V–11V single or ±1V–±5.5V dual - supports diverse power architectures including Li-ion, 5V, and split-rail analog front-ends |
Applications
| Battery Voltage Monitor | Multi-Supply Level Detector |
|---|---|
Use Scenario: Monitoring lithium-ion cell voltage during discharge to trigger low-battery warning before cutoff. IC Role / Device Role / Timing Role: Quad comparator compares divided cell voltage against 1.221V reference with user-defined hysteresis to prevent false triggers from ripple. Use Value: 8.5µA total supply current enables years of operation on a single CR2032; open-drain outputs interface directly with µP reset or interrupt lines. | Use Scenario: Simultaneous monitoring of multiple DC rails (e.g., 3.3V, 5V, 12V) in telecom equipment for fault reporting. IC Role / Device Role / Timing Role: Each comparator independently monitors one rail via resistor divider; HYST pins configured for rail-specific hysteresis. Use Value: Single IC replaces four discrete comparators + reference, reducing BOM count and PCB area while ensuring matched reference tracking across channels. |
| Window Comparator | Oscillator Circuit |
Use Scenario: Detecting if sensor output remains within safe operational bounds (e.g., temperature transducer in medical device). IC Role / Device Role / Timing Role: Two comparators form upper/lower thresholds using same REF; third comparator combines outputs via wired-OR logic. Use Value: Internal reference guarantees identical threshold tracking across temperature; hysteresis prevents oscillation near window edges. | Use Scenario: Building a relaxation oscillator for low-frequency clock generation in energy-harvesting systems. IC Role / Device Role / Timing Role: One comparator charges/discharges capacitor through feedback network; REF provides stable trip point. Use Value: 1.221V reference stability and <100pA input leakage ensure predictable frequency drift <±0.5%/°C over industrial range. |
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 |
|---|---|---|---|
| LTC1445IS#PBF | TTL/CMOS push-pull output (sources 40mA), no HYST pin; same 1.221V reference and quiescent current | Requires V+ pull-up for high-side switching; unsuitable where V–-referenced sinking is needed | Select when driving LEDs, relays, or logic inputs directly without external pull-ups |
| LTC1440CS#PBF | Single comparator, 1.128V ±1% reference, 5.7µA supply current, no hysteresis pin | Lower integration; lacks quad functionality and programmable hysteresis | Select for space-constrained single-threshold detection where hysteresis is fixed or unnecessary |
Compared with LTC1445IS#PBF, LTC1444IS#PBF offers V–-referenced sinking for level-shifted interfaces but cannot source current; compared with LTC1440CS#PBF, it delivers four-channel monitoring and field-adjustable hysteresis at higher component count efficiency.
Availability
LTC1444IS#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 LTC1444IS#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, power management, and sensing solutions for industrial, automotive, and communications markets.
The LTC1444IS#PBF belongs to Linear's ultralow power comparator family designed specifically for energy-constrained applications such as portable instrumentation, remote sensors, and maintenance-free monitoring systems where microamp-level quiescent current and integrated reference stability are mandatory.
FAQ
What is the reference voltage tolerance of the LTC1444IS#PBF over temperature?
The LTC1444IS#PBF features a 1.221V internal reference with ±1% initial accuracy at room temperature and ±1.5% maximum deviation over the full −40°C to +85°C industrial operating range. This specification is confirmed in the Electrical Characteristics table under "VREF" with conditions labeled "l" (applies over full temperature range), making LTC1444IS#PBF suitable for precision threshold detection without external calibration.
Can the LTC1444IS#PBF operate from a single 3.3V supply?
Yes, the LTC1444IS#PBF operates from a single 2V to 11V supply. With a 3.3V supply, V+ = 3.3V and V– = GND (0V), enabling full functionality including reference output, comparator inputs spanning 0V to 2.0V (V+ − 1.3V), and open-drain outputs that sink to GND. This configuration is explicitly supported in the Absolute Maximum Ratings and Applications Information sections of the datasheet.
How is hysteresis programmed on the LTC1444IS#PBF?
Hysteresis on the LTC1444IS#PBF is programmed externally using two resistors: R1 between REF and HYST pins, and R2 between HYST and V–. The hysteresis voltage band (VHB) equals twice the voltage difference between REF and HYST, with a maximum VHB of 100mV. The HYST pin accepts voltages from (REF − 50mV) to REF, and the design equations are provided in the Applications Information section (Figure 4 and associated calculations).
What is the maximum capacitive load the REF pin of the LTC1444IS#PBF can drive without oscillation?
The REF pin of the LTC1444IS#PBF can drive up to 0.01µF (10nF) capacitance directly without oscillation, as stated in the Description and Applications Information sections. For larger bypass capacitors (up to 100µF), a series damping resistor (e.g., 430Ω for 1µF, per Figure 2) must be added between REF and the capacitor to maintain stability.
Is the LTC1444IS#PBF pin-compatible with other devices in the LTC144x family?
The LTC1444IS#PBF shares the same 16-pin SO package and pinout as LTC1443IS#PBF and LTC1445IS#PBF, but Pin 14 functions as HYST (not GND) and outputs are open-drain (not push-pull). Therefore, while footprint-compatible, direct substitution requires circuit review - especially for pull-up requirements, hysteresis configuration, and output loading - as confirmed in the Pin Configuration diagrams and Pin Functions table.
LTC1444IS#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- 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-SO
LTC1444IS#PBF FAQ
1.How can I place an order for LTC1444IS#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1444IS#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 LTC1444IS#PBF reliable?
The price and inventory of LTC1444IS#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1444IS#PBF is usually 5 days.
3.What payment methods are accepted for LTC1444IS#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1444IS#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1444IS#PBF?
LTC1444IS#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1444IS#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 LTC1444IS#PBF?
For technical support, including LTC1444IS#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1444IS#PBF requirements.
6.How does Aetrix verify that LTC1444IS#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1444IS#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 LTC1444IS#PBF meets industry standards.
7.What is the process for return or replacement of LTC1444IS#PBF?
All LTC1444IS#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1444IS#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 LTC1444IS#PBF part is unused and in its original packaging.
Return procedure for LTC1444IS#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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