LTC1440 - Ultralow Power Single/Dual Comparator with Reference
Features
- Ultralow Quiescent Current: 2.1µA Typ
- Reference Output Drives 0.01µF Capacitor
- Adjustable Hysteresis
- Wide Supply Range:
Single: 2V to 11V
Dual: ±1V to ±5.5V - Input Voltage Range Includes the Negative Supply
- TTL/CMOS Compatible Outputs
- 12µs Propagation Delay with 10mV Overdrive
- No Crowbar Current
- 40mA Continuous Source Current
- Pin Compatible Upgrades for MAX921/931
- 3mm x 3mm x 0.75mm DFN Package
Typical Application
Description
The LTC1440 is an ultralow power comparator with a built-in voltage reference. The comparator features less than 4.0µA supply current over temperature. The internal reference is 1.182V with ±1% accuracy. The LTC1440 has programmable hysteresis and TTL/CMOS outputs that sink and source current. The reference output can drive a bypass capacitor of up to 0.01µF without oscillation.
The comparators operate from a single 2V to 11V supply or a dual ±1V to ±5.5V supply. Comparator hysteresis is easily programmed by using two resistors and the HYST pin. Each comparator’s input operates from the negative supply to within 1.3V of the positive supply. The comparator output stage can continuously source up to 40mA. By eliminating the cross-conducting current that normally happens when the comparator changes logic states, the power supply glitches are eliminated.
The LTC1440 is available in a 3mm x 3mm x 0.75mm DFN package, as well as 8-pin PDIP and SO-8.
Packaging
CAD Symbols and Footprints: The downloadable Zip file below contains the schematic symbol and PCB footprints.
For complete and up to date package information and drawings, please refer to our packaging page
| Part Number | Package | Code | Temp | Package Drawing |
RoHS |
|---|---|---|---|---|---|
| LTC1440CDD#PBF | 3x3 DFN-8 | DD | C | 05-08-1698 | Yes |
| LTC1440CDD#TRPBF | 3x3 DFN-8 | DD | C | 05-08-1698 | Yes |
| LTC1440CMS8#PBF | MS-8 | MS8 | C | 05-08-1660 | Yes |
| LTC1440CMS8#TRPBF | MS-8 | MS8 | C | 05-08-1660 | Yes |
| LTC1440CN8#PBF | N-8 | N | C | 05-08-1510 (N8) | Yes |
| LTC1440CS8#PBF | SO-8 | S8 | C | 05-08-1610 (S8) | Yes |
| LTC1440CS8#TRPBF | SO-8 | S8 | C | 05-08-1610 (S8) | Yes |
| LTC1440IDD#PBF | 3x3 DFN-8 | DD | I | 05-08-1698 | Yes |
| LTC1440IDD#TRPBF | 3x3 DFN-8 | DD | I | 05-08-1698 | Yes |
| LTC1440IMS8#PBF | MS-8 | MS8 | I | 05-08-1660 | Yes |
| LTC1440IMS8#TRPBF | MS-8 | MS8 | I | 05-08-1660 | Yes |
| LTC1440IN8#PBF | N-8 | N | I | 05-08-1510 (N8) | Yes |
| LTC1440IS8#PBF | SO-8 | S8 | I | 05-08-1610 (S8) | Yes |
| LTC1440IS8#TRPBF | SO-8 | S8 | I | 05-08-1610 (S8) | Yes |
Order Info
- Part numbers ending in PBF are lead free. Solder plated terminal finish (SnPb) versions are non-standard and special terms and conditions and pricing applies if available. Please contact LTC marketing for information.
- Part numbers containing TR or TRM are shipped in tape and reel or 500 unit mini tape and reel, respectively
- Please refer to our general ordering information or the product datasheet for more details
Package Variations and Pricing
| Part Number | Package | Temp | Price (1-99) |
Price (1k)* |
RoHS | |
|---|---|---|---|---|---|---|
| LTC1440CDD#PBF | 3x3 DFN-8 | C | $2.36 | $1.65 | Yes | |
| LTC1440CDD#TRPBF | 3x3 DFN-8 | C | $1.75 | Yes | ||
| LTC1440CMS8#PBF | MS-8 | C | $2.15 | $1.65 | Yes | |
| LTC1440CMS8#TRPBF | MS-8 | C | $1.71 | Yes | ||
| LTC1440CN8#PBF | N-8 | C | $1.85 | $1.45 | Yes | |
| LTC1440CS8#PBF | SO-8 | C | $1.85 | $1.45 | Yes | |
| LTC1440CS8#TRPBF | SO-8 | C | $1.51 | Yes | ||
| LTC1440IDD#PBF | 3x3 DFN-8 | I | $2.64 | $1.85 | Yes | |
| LTC1440IDD#TRPBF | 3x3 DFN-8 | I | $1.95 | Yes | ||
| LTC1440IMS8#PBF | MS-8 | I | $2.64 | $1.85 | Yes | |
| LTC1440IMS8#TRPBF | MS-8 | I | $1.91 | Yes | ||
| LTC1440IN8#PBF | N-8 | I | $2.20 | $1.70 | Yes | |
| LTC1440IS8#PBF | SO-8 | I | $2.20 | $1.70 | Yes | |
| LTC1440IS8#TRPBF | SO-8 | I | $1.76 | Yes | ||
| Buy Now • Request Samples | ||||||
Demo Boards
Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.Click here to view our complete list of demo boards
Applications
- Battery-Powered System Monitoring
- Threshold Detectors
- Window Comparators
- Oscillator Circuits
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Design Tools
LTspice
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Models for the following parts are available in LTspice:
LTC1440
Technical Support
- For immediate technical assistance, contact your local sales office or distributor or call 1-800-4-LINEAR (US customers only) or 408-432-1900.
- For less urgent requests, please complete our Technical Support Request Form. Please allow 2-3 business days for reply.
