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Analog Devices Inc. LTC1444CS#PBF
- Part No.:
- LTC1444CS#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Comparators
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1444CS#PBF.pdf
- Description:
- IC COMPARATOR 4 W/VOLT REF 16SO
- Quantity:
- Payment:
- Shipping:
Inventory:823
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Product details
Overview
LTC1444CS#PBF from Analog Devices (formerly Linear Technology) is an ultralow power quad comparator IC with integrated 1.221V ±1% voltage reference and open-drain outputs referenced to V–. It draws only 8.5µA max supply current over temperature, supports single-supply operation from 2V to 11V, and features programmable hysteresis via the HYST pin - enabling precise threshold detection in battery-powered sensor monitoring systems.
For engineers reviewing the LTC1444CS#PBF datasheet, LTC1444CS#PBF pinout, LTC1444CS#PBF application, or LTC1444CS#PBF equivalent, key selection criteria include its 1.221V reference accuracy, open-drain output compatibility with V–-referenced logic, 14µs propagation delay at 10mV overdrive, and SO-16 package suitability for space-constrained industrial and portable designs.
Technical Context
The LTC1444CS#PBF implements four independent comparators sharing a precision bandgap reference (1.221V ±1% over –40°C to +85°C), with input common-mode range extending from V– to V+ – 1.3V and typical input leakage of ±10pA. Its HYST pin enables adjustable hysteresis using two external resistors, supporting stable switching in noisy environments.
Unlike the TTL/CMOS-output LTC1443/LTC1445, the LTC1444CS#PBF uses open-drain outputs tied to V–, allowing level-shifting and wired-OR configurations. The reference output drives up to 0.01µF bypass capacitors without oscillation and delivers ±15µA sink/source capability while maintaining micropower operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Current | 8.5µA max over full temperature range - enables multi-year battery life in always-on monitoring nodes |
| Reference Voltage | 1.221V ±1% (C-temp), ±1.5% (I-temp) - provides stable threshold reference without external components |
| Propagation Delay | 14µs typ at 10mV overdrive (COUT = 100pF) - balances speed and power for low-frequency event detection |
| Input Offset Voltage | ±10mV max - ensures reliable detection of small differential signals near reference |
| Common-Mode Range | V– to V+ – 1.3V - supports rail-to-rail sensing in single-supply systems down to 2V |
| Output Type | Open-drain to V– - enables flexible interfacing with diverse logic families and pull-up voltages |
| Hysteresis Control | Programmable via HYST pin (REF – 50mV to REF) - eliminates chatter without external feedback networks |
Pinout & Package
Package: 16-lead plastic SO (Small Outline), 0.150-inch width, RoHS-compliant lead-free finish (PBF).
| 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 external circuits |
| V+ (3) | Positive supply rail | Accepts 2V–11V single supply or ±1V–±5.5V dual supply |
| IN A– (4) | Inverting input of Comparator A | Operates from V– to V+ – 1.3V; 10pA typical input bias current |
| IN A+ (5) | Noninverting input of Comparator A | Same common-mode range and bias as IN A– |
| IN B– (6) | Inverting input of Comparator B | Identical electrical characteristics to IN A– |
| IN B+ (7) | Noninverting input of Comparator B | Identical electrical characteristics to IN A+ |
| REF (8) | Reference voltage output | 1.221V ±1%, drives ≤0.01µF directly; sources/sinks ±15µA |
| V– (9) | Negative supply rail | Ground for single-supply operation; internally connected to exposed pad in DFN |
| IN C– (10) | Inverting input of Comparator C | Full common-mode range; matches inputs A/B/D |
| IN C+ (11) | Noninverting input of Comparator C | Same as IN C– |
| IN D– (12) | Inverting input of Comparator D | Fourth independent comparator input pair |
| IN D+ (13) | Noninverting input of Comparator D | Completes quad comparator set |
| HYST (14) | Hysteresis control input | Accepts voltage from REF – 50mV to REF; sets hysteresis band width |
| OUT D (15) | Comparator D open-drain output | Same sink capability and interface requirements as OUT A/B |
| OUT C (16) | Comparator C open-drain output | Final output channel; fully independent and identical to others |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow quiescent current | 8.5µA max over temperature - extends battery life in remote sensors and wearables |
| Integrated 1.221V reference | ±1% initial accuracy, ±1.5% over –40°C to +85°C - eliminates external reference IC and reduces BOM count |
| Programmable hysteresis | Adjustable via two resistors on HYST pin - prevents false triggering in noisy industrial environments |
| Open-drain outputs referenced to V– | Enables level translation and wired-OR bus architectures - simplifies interface with mixed-voltage systems |
| Wide supply range | 2V–11V single supply or ±1V–±5.5V dual supply - supports legacy and modern low-voltage rails |
| Input range includes negative rail | V– to V+ – 1.3V - allows direct sensing of ground-referenced signals without level shifters |
Applications
| Battery Voltage Monitor | Multi-Threshold Level Detector |
|---|---|
Use Scenario: Monitoring lithium-ion cell voltage during charge/discharge cycles in portable medical devices. IC Role / Device Role / Timing Role: LTC1444CS#PBF compares cell voltage against 1.221V reference scaled by resistor dividers to detect under-voltage (UVLO) and over-voltage (OVLO) thresholds. Use Value: Eliminates need for external reference and reduces total solution size by 30% versus discrete comparator + reference designs. | Use Scenario: Detecting multiple supply rails (e.g., 3.3V, 5V, 12V) in telecom line cards with fault isolation. IC Role / Device Role / Timing Role: LTC1444CS#PBF uses separate comparators per rail, each with independently programmed hysteresis via HYST pin. Use Value: Prevents nuisance trips from transient noise while ensuring fast response to sustained overvoltage events. |
| Glitch-Immune Oscillator | Window Comparator for Sensor Signals |
Use Scenario: Building a low-power relaxation oscillator for periodic wake-up in IoT edge nodes. IC Role / Device Role / Timing Role: LTC1444CS#PBF configures one comparator as hysteresis-based Schmitt trigger driving RC timing network; reference stabilizes threshold. Use Value: Achieves <1µA average current in sleep mode while maintaining ±2% frequency stability across temperature. | Use Scenario: Validating thermistor or RTD output stays within safe operating window in HVAC control systems. IC Role / Device Role / Timing Role: Two comparators in LTC1444CS#PBF form upper/lower bounds around 1.221V reference; third monitors reference integrity. Use Value: Provides fail-safe detection with built-in redundancy - no external op-amps or precision resistors required. |
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 |
|---|---|---|---|
| LTC1445CS#PBF | TTL/CMOS push-pull outputs (not open-drain); same 1.221V reference and hysteresis capability | Requires V+ referenced logic; unsuitable for level-shifting or wired-OR buses | Select when driving standard CMOS loads directly without pull-ups |
| LTC1441CS#PBF | Dual comparator (not quad); 1.182V reference; no hysteresis pin; 5.7µA supply current | Lower channel count and power; lacks programmable hysteresis and open-drain flexibility | Select when only two thresholds needed and minimal current draw is critical |
Compared with LTC1445CS#PBF, the LTC1444CS#PBF trades push-pull drive for open-drain versatility and level-shifting capability; compared with LTC1441CS#PBF, it doubles channel count and adds hysteresis control at the cost of 2.8µA higher quiescent current.
Availability
LTC1444CS#PBF is available at Aetrix Electronics and suitable for battery-powered system monitoring, threshold detectors, window comparators, and oscillator circuits requiring stable component supply and long-term manufacturability.
Supply support for LTC1444CS#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 high-precision analog IC portfolio, emphasizing reliability, low-power innovation, and automotive/industrial qualification.
The LTC1444CS#PBF belongs to Linear's ultralow power comparator family, designed specifically for energy-constrained applications where reference stability, hysteresis control, and minimal supply current are critical - such as portable instrumentation and remote environmental sensors.
FAQ
What is the reference voltage tolerance of the LTC1444CS#PBF over temperature?
The LTC1444CS#PBF features a 1.221V internal reference with ±1% initial accuracy at 25°C and ±1.5% total variation over the industrial temperature range (–40°C to +85°C). This specification is confirmed in the Electrical Characteristics table under "VREF" with conditions noted for C- and I-grade parts. The reference remains stable under load, delivering ±15µA sink/source while holding regulation within 2.5mV.
Can the LTC1444CS#PBF operate from a single 3.3V supply?
Yes, the LTC1444CS#PBF operates from a single 2V to 11V supply, making 3.3V fully supported. With V– tied to ground, all inputs function from 0V to 2.0V (V+ – 1.3V), and the 1.221V reference provides a robust mid-rail threshold. Open-drain outputs require external pull-up to 3.3V, enabling clean interfacing with 3.3V logic families without level translators.
How is hysteresis configured on the LTC1444CS#PBF?
Hysteresis on the LTC1444CS#PBF is configured using two external 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 maximum VHB = 100mV (REF – HYST ≤ 50mV). For example, setting R2 = 2.4MΩ and R1 = 15kΩ yields ~15mV hysteresis at the comparator input when scaled by the external divider.
What is the maximum capacitive load the REF pin can drive without oscillation?
The REF pin of the LTC1444CS#PBF can directly drive a bypass capacitor of up to 0.01µF (10nF) without oscillation, as explicitly stated in the datasheet's Description and Applications Information sections. For larger capacitors (up to 100µF), a series damping resistor (e.g., 430Ω for 1µF) must be added between REF and the capacitor to ensure stability, per Figure 1 and Figure 2 in the datasheet.
Is the LTC1444CS#PBF pin-compatible with any legacy comparators?
The LTC1444CS#PBF is not documented as pin-compatible with MAX924 or other legacy comparators. While the LTC1443 is noted as a pin-compatible upgrade for MAX924, the LTC1444 differs in output structure (open-drain vs. push-pull) and pin 14 function (HYST vs. GND), making direct replacement impossible without PCB modification. System-level validation is required before substitution.
LTC1444CS#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:
- 0°C ~ 70°C
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- Surface Mount
- :
- 16-SO
LTC1444CS#PBF FAQ
1.How can I place an order for LTC1444CS#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1444CS#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 LTC1444CS#PBF reliable?
The price and inventory of LTC1444CS#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1444CS#PBF is usually 5 days.
3.What payment methods are accepted for LTC1444CS#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1444CS#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1444CS#PBF?
LTC1444CS#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1444CS#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 LTC1444CS#PBF?
For technical support, including LTC1444CS#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1444CS#PBF requirements.
6.How does Aetrix verify that LTC1444CS#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1444CS#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 LTC1444CS#PBF meets industry standards.
7.What is the process for return or replacement of LTC1444CS#PBF?
All LTC1444CS#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1444CS#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 LTC1444CS#PBF part is unused and in its original packaging.
Return procedure for LTC1444CS#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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