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Analog Devices Inc. LTC1760IFW#TRPBF
- Part No.:
- LTC1760IFW#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Battery Chargers
- Package:
- 48-TFSOP (0.240", 6.10mm Width)
- Datasheet:
-
LTC1760IFW#TRPBF.pdf
- Description:
- IC BATT CHG SMART 2CEL 48TSSOP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LTC1760IFW#TRPBF from Analog Devices (formerly Linear Technology) is a dual smart battery system manager IC implementing SMBus Level 3 charger/selector functionality for portable systems with two smart batteries. It features ±0.2% voltage/current accuracy referenced to battery-reported values, autonomous PowerPath™ switching (<10 µs), and simultaneous charging/discharging capability in a 48-lead TSSOP package. It is used in high-reliability portable computers requiring seamless AC/battery switchover and extended runtime.
For engineers reviewing the LTC1760IFW#TRPBF datasheet, LTC1760IFW#TRPBF pinout, LTC1760IFW#TRPBF application, or LTC1760IFW#TRPBF equivalent, key selection criteria include dual-battery SMBus arbitration support, programmable charge current/voltage limits via ILIMIT/VLIMIT pins, thermistor-based SafetySignal monitoring, and guaranteed operation from –40°C to 125°C.
Technical Context
The LTC1760IFW#TRPBF integrates three independent SMBus interfaces - one host-facing (SCL/SDA), and two battery-facing (SCL1/SDA1, SCL2/SDA2) - enabling real-time servoing of charge parameters to internal battery measurements. Its proprietary PowerPath architecture uses six P-channel MOSFET gate drivers (GDCO/GDCI, GB1O/GB1I, GB2O/GB2I) to manage power routing between DCIN, BAT1, and BAT2 without interruption.
It implements all SMBus Charger V1.1 safety features including overvoltage shutdown (107% of programmed voltage), short-circuit detection (90–115 mV threshold), and autonomous emergency switching triggered by LOPWR/DCDIV comparators. Charging regulation is achieved via a synchronous buck converter controlled by TGATE/BGATE/BOOST/SW pins, with inner-loop current control on ITH and outer-loop voltage feedback via VSET.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Operating Temp Range | –40°C to 125°C (I-grade), enabling use in industrial and extended-temperature portable equipment |
| Charging Voltage Accuracy | ±32 mV vs battery-reported Voltage() value, ensuring precise cell-level voltage regulation per SMBus spec |
| Charging Current Accuracy | ±2–8 mA depending on RILIMIT setting, supporting accurate current limiting across 930–4430 mA range |
| PowerPath Switching Time | <10 µs autonomous switchover prevents system brownout during AC adapter removal or battery depletion |
| SMBus Timing Compliance | Meets SMBus v1.1 timing: tHIGH ≥4 µs, tLOW ≥4.7 µs, tTIMEOUT_SMB ≤35 ms, with integrated SMBus Accelerator |
| Battery Voltage Range | 0–28 V per battery input (BAT1/BAT2), supporting Li-ion, NiMH, and multi-cell configurations |
| DCIN Operating Range | 6–28 V, compatible with standard 12–24 V wall adapters and automotive inputs |
Pinout & Package
Package: 48-lead plastic TSSOP (FW package), RoHS-compliant, lead-free finish, moisture sensitivity level 3.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VPLUS (1) | Internal diode-OR power rail | Supplies internal circuitry from DCIN, BAT1, BAT2, or SCN; bypassed with 0.1 µF + 1 µF capacitors |
| BAT1 (3), BAT2 (2) | Battery input terminals | Direct connection points for dual smart battery packs; enable autonomous discharge into single load |
| GDCO/GDCI (6/7), GB1O/GB1I (8/9), GB2O/GB2I (10/11) | P-channel FET gate drivers | Control six external P-MOSFETs to implement lossless, bidirectional PowerPath switching |
| SCH1/SCH2 (45/48), GCH1/GCH2 (46/47) | Charger MUX switch controls | Drive back-to-back N-MOSFET pairs to route buck charger output to BAT1 or BAT2 selectively |
| VSET (13), ITH (14), ISET (15), ILIMIT (32), VLIMIT (33) | Programmable charge interface | Set target voltage/current via resistor dividers; enable fine-grained DAC resolution (11-bit VDAC, 10-bit IDAC) |
| TH1A/TH1B (17/18), TH2A/TH2B (21/22) | Thermistor interface | Monitor battery temperature and disconnection status (SafetySignal) using dual 2-resistor thermistor networks |
| SCL/SDA (18/19), SCL1/SDA1 (17/20), SCL2/SDA2 (16/23) | SMBus physical layer | Three isolated SMBus ports: host, battery 1, battery 2 - with internal pull-ups and accelerator logic |
Key Features
| Feature | Design Value |
|---|---|
| Dual SMBus Battery Arbitration | Enables concurrent communication with two smart batteries while preventing partial-message corruption via internal multiplexer |
| Autonomous PowerPath Switching | Sub-10 µs switchover between DCIN, BAT1, and BAT2 ensures zero-interruption power delivery during source transitions |
| Smart Battery Servo Charging | Charges to voltage/current values reported by battery electronics (not terminal measurements), achieving ±0.2% accuracy |
| Programmable Charge Limits | Pin-strapped ILIMIT and VLIMIT allow safe, application-specific current/voltage ceilings without firmware changes |
| Integrated Thermistor Safety Monitoring | Dual THxA/THxB inputs detect cold/hot/under/over-range conditions and open-circuit faults per SafetySignal protocol |
| SMBus Accelerator Logic | Reduces host-side SMBus timing constraints by handling clock stretching and retry logic internally |
Applications
| Portable Computers | Standalone Dual Smart Battery Chargers |
|---|---|
Use Scenario: Notebook PCs requiring hot-swappable dual battery operation with uninterrupted runtime during AC adapter insertion/removal. IC Role / Device Role / Timing Role: System-level smart battery manager coordinating charge/discharge, power routing, and SMBus telemetry between host and two batteries. Use Value: Extends typical battery runtime by up to 10% and reduces full-charge time by up to 50% versus sequential charging. | Use Scenario: Bench-top or rack-mounted chargers servicing two removable smart battery packs independently. IC Role / Device Role / Timing Role: Standalone SMBus charger/selector executing autonomous charging sequences without host CPU involvement. Use Value: Enables wake-up charging (60–100 mA) and controlled charging with timeout (140–210 sec) for deeply discharged cells. |
| Battery Backup Systems | Industrial Portable Instruments |
Use Scenario: Critical infrastructure UPS or telecom backup units needing failover between primary and secondary battery banks. IC Role / Device Role / Timing Role: Redundant power path controller enforcing strict undervoltage lockout (UVLO = 3–5 V) and fast fault isolation. Use Value: Guarantees <10 µs switchover during input failure, meeting stringent uptime requirements for mission-critical loads. | Use Scenario: Handheld test equipment operating in wide ambient temperatures (-40°C to 125°C junction). IC Role / Device Role / Timing Role: Temperature-hardened battery manager supporting thermistor-based thermal shutdown and cold-weather wake-up. Use Value: Validated I-grade operation ensures reliable performance in uncontrolled environments where C-grade parts would fail. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar smart battery management applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ24725ARSMR | Single-battery SMBus charger; lacks dual-battery arbitration, PowerPath switching, and SafetySignal thermistor interface | Designed for single-battery notebooks; cannot replace LTC1760IFW#TRPBF in dual-battery topologies | Select only if system uses one smart battery and requires lower BOM cost |
| ISL9237HRZ-T | Supports dual batteries but uses I²C (not SMBus), lacks autonomous PowerPath switching, and has no integrated SMBus accelerator | Targeted at embedded systems with host-controlled power management; requires external MCU for switchover logic | Choose when SMBus compliance is not required and host firmware can handle timing-critical switching |
Compared with BQ24725ARSMR and ISL9237HRZ-T, the LTC1760IFW#TRPBF uniquely delivers true dual-SMBus arbitration, sub-10 µs autonomous PowerPath switching, and SafetySignal-compliant thermistor monitoring - making it irreplaceable in high-availability dual-battery systems demanding zero-interruption operation.
Availability
LTC1760IFW#TRPBF is available at Aetrix Electronics and suitable for portable computers, battery backup systems, and industrial portable instruments requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC1760IFW#TRPBF 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, Inc. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors.
The LTC1760IFW#TRPBF belongs to Linear's Smart Battery System Manager product line, designed specifically for SMBus Level 3 dual-battery portable platforms requiring autonomous, high-accuracy charging and seamless power source handoff.
FAQ
What is the operating temperature range for the LTC1760IFW#TRPBF?
The LTC1760IFW#TRPBF is rated for operation from –40°C to 125°C junction temperature (I-grade). This specification is guaranteed per datasheet Note 6 and validated across process corners and silicon lots. The LTC1760IFW#TRPBF achieves this range via enhanced thermal design and screening, distinguishing it from the C-grade version (0°C to 85°C). Applications requiring extended environmental tolerance - such as industrial handhelds or outdoor telecom equipment - rely on this rating for sustained reliability.
How does the LTC1760IFW#TRPBF achieve ±0.2% charging accuracy?
The LTC1760IFW#TRPBF achieves ±0.2% voltage and current accuracy by servoing directly to the Voltage() and Current() values reported by the smart battery's internal fuel gauge IC over SMBus - not to terminal measurements. This eliminates errors from IR drops, connector resistance, and cable losses. The LTC1760IFW#TRPBF reads these values every second (tQUERY = 1 sec) and adjusts its buck regulator accordingly. Accuracy is confirmed in Electrical Characteristics table under VTOL (±32 mV) and ITOL (±2–8 mA), referenced to battery-reported data.
Can the LTC1760IFW#TRPBF operate without an SMBus host controller?
Yes, the LTC1760IFW#TRPBF supports fully autonomous operation without an SMBus host. It implements all SMBus Charger V1.1 safety features - including overvoltage shutdown, short-circuit protection, and thermal monitoring - and executes wake-up charging, controlled charging, and PowerPath switching independently. The MODE pin and VDDS supply configure standalone behavior, and the device maintains valid SMBus responses on SCL/SDA even when disconnected from a host, enabling compatibility with legacy or minimal-host designs.
What is the purpose of the SafetySignal function in the LTC1760IFW#TRPBF?
The SafetySignal function in the LTC1760IFW#TRPBF monitors thermistor networks on both batteries using TH1A/TH1B and TH2A/TH2B pins to detect temperature excursions and open-circuit faults. It implements the Smart Battery System SafetySignal protocol, reporting cold, hot, under-range, and over-range conditions to the host via SMBus. This enables real-time thermal protection and battery disconnection detection - critical for UL/IEC 62133 compliance. The LTC1760IFW#TRPBF validates thermistor resistances against four trip thresholds (e.g., 95–105 kΩ for cold-range) per datasheet Table on page 6.
Does the LTC1760IFW#TRPBF support simultaneous charging of both batteries?
Yes, the LTC1760IFW#TRPBF supports true simultaneous charging of both batteries using its integrated dual-charge MUX (SCH1/GCH1 and SCH2/GCH2) and buck regulator. Unlike sequential chargers, it routes charger output to BAT1 and BAT2 concurrently via back-to-back N-MOSFET pairs, enabling up to 50% faster full-charge times and >95% efficiency. This capability is confirmed in the Typical Application diagram (TA01), performance graphs (G03, G06), and Features list ("Low Loss Simultaneous Charging of Two Batteries").
LTC1760IFW#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 48-TFSOP (0.240", 6.10mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Battery Chemistry:
- Smart Batteries
- Number of Cells:
- 2
- Current - Charging:
- Constant - Programmable
- Programmable Features:
- -
- Fault Protection:
- -
- Charge Current - Max:
- 4.43A
- Battery Pack Voltage:
- -
- Voltage - Supply (Max):
- 28V
- Interface:
- I2C
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 48-TSSOP
LTC1760IFW#TRPBF FAQ
1.How can I place an order for LTC1760IFW#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1760IFW#TRPBF 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 LTC1760IFW#TRPBF reliable?
The price and inventory of LTC1760IFW#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1760IFW#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1760IFW#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1760IFW#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1760IFW#TRPBF?
LTC1760IFW#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1760IFW#TRPBF 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 LTC1760IFW#TRPBF?
For technical support, including LTC1760IFW#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1760IFW#TRPBF requirements.
6.How does Aetrix verify that LTC1760IFW#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1760IFW#TRPBF 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 LTC1760IFW#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1760IFW#TRPBF?
All LTC1760IFW#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1760IFW#TRPBF, 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 LTC1760IFW#TRPBF part is unused and in its original packaging.
Return procedure for LTC1760IFW#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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