LTC2946IDE#PBF Analog Devices Integrated Circuit (Small Outline No-lead) In Stock
LTC2946IDE#PBF is a high-voltage wide-range power monitor IC from Analog Devices, capable of measuring voltage, current, and power on rails from 2.7 V to 100 V with 12-bit resolution via an I2C/SMBus interface. It integrates 3 monitoring channels, adjustable alert thresholds, and energy accumulation registers in a compact 16-pin DFN-EP package. Ideal for server power management, automotive telematics, and industrial energy monitoring applications.
- Manufacturer
- Analog Devices
- Package
- Small Outline No-lead
- Pin Count
- 16
- Lifecycle
- ACTIVE
- Datasheet
- LTC2946IDE#PBF Datasheet PDF
- Category
- Integrated Circuit
- Price
- From $6.7600(MOQ 1)
- Temp Range
- -40.0°C to 85.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- 2.7 V to 100 V wide operating range covers automotive 12/24/48 V and server 48 V bus rails in a single device
- Simultaneous 12-bit voltage, current, and power measurement with integrated sense resistor averaging
- I2C/SMBus interface with programmable alert thresholds and energy accumulation registers for autonomous power logging
- 3 independent monitoring channels enable multi-rail power budgeting without additional ICs
- Compact 16-pin 5×3 mm DFN-EP package with exposed pad for low-profile, thermally efficient PCB mounting
Applications
The LTC2946IDE#PBF is designed for precision power management in high-voltage systems such as 48 V server backplane rails, automotive battery management units, and industrial motor drives where continuous real-time energy metering is required. Its 2.7 V to 100 V operating range and 3-channel architecture allow a single device to simultaneously monitor input, intermediate, and output rails in DC-DC converter stages. With programmable alert thresholds and an I2C interface, it integrates directly into BMC or microcontroller-based power monitoring loops for overcurrent protection and energy-efficiency reporting.
Specifications
| Pbfree Code | No |
| Manufacturer Package Code | 05-08-1732 |
| Reach Compliance Code | Compliant |
| YTEOL | 10 |
| Additional Feature | MNL RST:N;PW FL IO:N;PRG RST DLY:N;WD:N;WDO:N;WWD:N |
| Adjustable Threshold | YES |
| Analog IC - Other Type | VOLTAGE SUPERVISOR/RESET IC |
| JESD-30 Code | R-PDSO-N16 |
| JESD-609 Code | e3 |
| Number of Channels | 3 |
| Number of Functions | 1 |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | SOLCC16,.12,18 |
| Package Shape | RECTANGULAR |
| Package Style | SMALL OUTLINE, VERY THIN PROFILE, SHRINK PITCH |
| Supply Current-Max (Isup) | 1.3mA |
| Supply Voltage-Max (Vsup) | 100V |
| Supply Voltage-Min (Vsup) | 4V |
| Supply Voltage-Nom (Vsup) | 48V |
| Surface Mount | NO |
| Technology | CMOS |
| Temperature Grade | INDUSTRIAL |
| Terminal Finish | Matte Tin (Sn) |
| Terminal Form | NO LEAD |
| Terminal Pitch | 0.45mm |
| Terminal Position | DUAL |
| Threshold Voltage-Nom | +1.3V |
| Package | Small Outline No-lead |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| Moisture Sensitivity Level | MSL 1 |
| ECCN | EAR99 |
| HTS Code | 8542.39.00.01 |
| Country of Origin | Thailand |
Alternate & Equivalent Parts
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
What voltage rails can the LTC2946IDE#PBF monitor, and is it suitable for 48 V server power architecture?
The LTC2946IDE#PBF operates across a 2.7 V to 100 V input range, making it fully compatible with 48 V server open-rack power architectures as well as 12 V and 24 V systems. Its 12-bit ADC resolves voltage differences as small as approximately 25 mV on a 100 V bus, enabling tight power budgeting. All 3 monitoring channels share this range, so a single IC can simultaneously track the 48 V input and two lower-voltage intermediate bus rails.
How does the LTC2946IDE#PBF calculate power, and what accuracy can system designers expect?
The LTC2946IDE#PBF multiplies 12-bit digitized voltage and current samples to produce real-time power readings and accumulates them into 24-bit energy registers, allowing energy-to-date calculations without an external microcontroller. Current is measured via an external shunt resistor—typically 10 mΩ to 100 mΩ—and the device's current-sense input range of ±102.4 mV supports milliamp resolution. The integrated ADC achieves better than 0.5% linearity error across the full operating range, sufficient for server power monitoring and IEC 62053 sub-metering compliance.
Can the LTC2946IDE#PBF trigger automatic alerts for overcurrent conditions without continuous firmware polling?
Yes, the LTC2946IDE#PBF provides programmable upper and lower threshold registers for voltage, current, and power. When any measurement crosses a programmed limit, an open-drain ALERT pin asserts low, notifying the host MCU or BMC via interrupt without polling. Threshold hysteresis is also configurable to prevent chatter on noisy rails. This autonomous alert mechanism allows software to handle only exception events rather than continuously reading the I2C bus, reducing CPU overhead in 48 V server management controllers.
For an automotive 48 V mild-hybrid system, how should the external shunt resistor for the LTC2946IDE#PBF be selected?
In a 48 V mild-hybrid system passing up to 100 A, the shunt resistor must fit within the LTC2946IDE#PBF's ±102.4 mV sense input range. A 1 mΩ shunt produces 100 mV at 100 A—well within range—while dissipating only 10 W. For lower currents such as 10 A auxiliary loads, a 10 mΩ shunt giving 100 mV at full scale improves 12-bit resolution to approximately 0.025 mA per LSB. The shunt should be an AEC-Q200-qualified component rated for the required continuous current and -40°C to +125°C automotive temperature range.
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About Analog Devices
Analog Devices (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing integrated circuits used in virtually all types of electronic equipment.
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| Qty. | Unit Price | Ext. Price |
|---|---|---|
| 1+ | $13.3900 | $13.39 |
| 10+ | $9.2580 | $92.58 |
| 19+ | $8.2400 | $156.56 |
| 35+ | $7.5920 | $265.72 |
| 100+ | $7.2800 | $728.00 |
| 200+ | $6.7600 | $1352.00 |
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