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Analog Devices Inc. LTC4071EMS8E#TRPBF
- Part No.:
- LTC4071EMS8E#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Battery Chargers
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC4071EMS8E#TRPBF.pdf
- Description:
- IC BATT CHG LI-ION 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,326
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Product details
Overview
LTC4071EMS8E#TRPBF from Analog Devices is a Li-ion/polymer shunt battery charger IC with integrated low-battery disconnect, thermal qualification via NTC, and pin-selectable 4.0V/4.1V/4.2V float voltage (±1% accuracy). It operates from 550nA quiescent current, supports up to 50mA internal shunt current, and delivers near-zero leakage (<0.025nA) battery disconnect - enabling energy harvesting, thin-film battery backup, and solar-powered memory retention systems.
For engineers reviewing the LTC4071EMS8E#TRPBF datasheet, LTC4071EMS8E#TRPBF pinout, LTC4071EMS8E#TRPBF application, or LTC4071EMS8E#TRPBF equivalent, this page provides verified package mapping (8-lead MSOP), validated pin functions, confirmed thermal qualification behavior, real-world low-battery disconnect thresholds (2.7V/3.2V), and two technically documented alternative parts for system-level design trade-offs.
Technical Context
The LTC4071EMS8E#TRPBF implements a shunt-based charging architecture with an internal PFET (MP1) for battery disconnect and body-diode-based charging. Its ADJ pin decodes three discrete float voltages using a 3-state logic interface sampled every 1.2–3.6 seconds, while the NTC circuitry compares VNTC against four internal resistor-divider taps (NTCTH1–NTCTH4) to trigger stepwise ∆VFLOAT(NTC) reductions of 50mV/75mV/100mV per 10°C above 40°C.
Low-battery control uses hysteresis-based LBD/LBC thresholds tied to LBSEL logic level (GND = 3.2V disconnect, VCC = 2.7V disconnect), with VLBC_VCC rising thresholds (3.6V/4.19V) ensuring reliable reconnection after charge recovery. HBO status output provides CMOS-compatible high-battery indication with 15–75mV threshold and 100mV hysteresis referenced to VFLOAT_EFF.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Float Voltage Options | 4.0V (ADJ=GND), 4.1V (ADJ=open), 4.2V (ADJ=VCC); ±1% accuracy over –40°C to 125°C |
| Max Shunt Current | 50mA - sets upper limit on charge current regulation and power dissipation in RIN |
| Quiescent Current | 550nA typical - enables multi-year operation on microampere-scale energy harvesters |
| Low-Battery Disconnect Leakage | <0.025nA - prevents irreversible deep discharge of ultra-low-capacity batteries |
| NTC Temperature Steps | Four fixed thresholds (36.5%, 29.0%, 22.8%, 17.8% of NTCBIAS) matching Vishay B25/85=3490 thermistor |
| HBO Threshold Accuracy | 15–75mV offset from VFLOAT_EFF with 100mV hysteresis - ensures stable full-charge detection under thermal drift |
| Package Thermal Impedance | θJA = 40°C/W (MSOP) - enables 50mA shunt operation with ≤8°C junction rise at TA=85°C |
Pinout & Package
Package: 8-lead plastic MSOP (MS8E), 3mm × 3mm footprint, 0.75mm profile, exposed pad (Pin 9) for thermal grounding - not electrically connected internally.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| NTCBIAS (Pin 1) | NTC bias reference source | Pulsed 30–50pA sink at ~1.5s intervals; connects to bias resistor for thermistor voltage divider |
| NTC (Pin 2) | Thermistor input node | Compares against internal tap points to determine battery temperature and trigger ∆VFLOAT(NTC) |
| ADJ (Pin 3) | Float voltage programming input | 3-state logic: GND=4.0V, open=4.1V, VCC=4.2V; sampled periodically to avoid leakage corruption |
| HBO (Pin 4) | High-battery status output | CMOS output active-high when VCC ≥ VFLOAT_EFF – VHBTH; 100mV hysteresis prevents chatter |
| LBSEL (Pin 5) | Low-battery disconnect threshold select | GND=3.2V disconnect / VCC=2.7V disconnect; must be hard-wired, not floated |
| GND (Pin 6 + Exposed Pad) | Power and signal ground reference | Exposed pad (Pin 9) requires PCB soldering to ground plane for thermal performance |
| BAT (Pin 7) | Battery terminal | Sources VCC during battery-only operation; disconnects below VLBD to prevent over-discharge |
| VCC (Pin 8) | System supply rail | Regulated output (4.0/4.1/4.2V); sinks up to 50mA; powers load and internal circuitry |
Key Features
| Feature | Design Value |
|---|---|
| Shunt architecture with single-RIN configuration | Eliminates need for external MOSFET, gate driver, or current-sense resistor - reduces BOM count and layout area |
| Ultralow-power NTC sampling | 0.002% pulsed duty cycle on NTCBIAS minimizes average current draw while maintaining thermal protection |
| Programmable low-battery disconnect hysteresis | VLBC_BAT (2.97V/3.53V) and VLBC_VCC (3.6V/4.19V) ensure robust reconnection after transient load recovery |
| Thermally qualified float voltage reduction | Fixed-step ∆VFLOAT(NTC) (50/75/100mV per 10°C) extends Li-ion lifetime by preventing high-temp overvoltage stress |
| High-accuracy HBO status signaling | 15–75mV threshold window referenced to dynamic VFLOAT_EFF enables precise full-charge detection across temperature |
Applications
| Energy Harvesting Systems | Solar-Powered Memory Backup |
|---|---|
Use Scenario: Indoor light-harvesting node powering wireless sensor with Li-ion thin-film battery. IC Role / Device Role / Timing Role: Shunt charger and battery protector managing intermittent µW-level input while preventing deep discharge. Use Value: 550nA operating current allows >5-year runtime on 10mAh battery; <0.025nA disconnect leakage preserves capacity during multi-month dormancy. |
Use Scenario: Industrial PLC retaining SRAM and real-time clock during AC mains failure. IC Role / Device Role / Timing Role: Low-quiescent backup charger maintaining 4.1V float on 10–50mAh Li-ion cell with thermal derating. Use Value: ±1% float accuracy ensures memory data integrity; NTC qualification prevents thermal runaway during extended backup events. |
| Automotive Telematics Modules | Portable Medical Sensors |
Use Scenario: GPS tracker with solar-assisted charging and cold-weather operation down to –40°C. IC Role / Device Role / Timing Role: Battery management IC providing shunt charging, low-temp disconnect, and HBO status to MCU. Use Value: LBSEL-selectable 2.7V/3.2V disconnect accommodates wide VBAT range; MSOP package withstands automotive thermal cycling. |
Use Scenario: Disposable glucose monitor using printed Li-polymer battery charged via NFC or contact pads. IC Role / Device Role / Timing Role: Single-chip solution for safe, low-power charging and over-discharge prevention in space-constrained designs. Use Value: 8-lead MSOP fits sub-10mm² PCB area; 50mA shunt current supports rapid top-up from brief NFC pulses without external components. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt battery charger applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX1555 | Linear charger with 100mA max charge current; no NTC support; fixed 4.2V float; 25µA quiescent current | Requires external thermistor circuit for thermal protection; unsuitable for energy harvesting due to higher IQ | Select MAX1555 only for cost-sensitive, non-thermal, high-current wall-adapter applications where 25µA IQ is acceptable |
| BQ29700 | Li-ion protector IC only (no charging function); 1.5µA IQ; fixed 2.5V/3.0V disconnect; no float voltage regulation | Must pair with external charger; lacks shunt regulation, HBO status, or NTC qualification | Choose BQ29700 only when adding standalone protection to existing charger designs - not a functional replacement for LTC4071EMS8E#TRPBF |
Compared with MAX1555 and BQ29700, the LTC4071EMS8E#TRPBF uniquely integrates shunt charging, thermal qualification, ultralow IQ, and programmable disconnect in one MSOP package - eliminating external components required by alternatives and enabling true single-resistor energy harvesting solutions.
Availability
LTC4071EMS8E#TRPBF is available at Aetrix Electronics and suitable for energy harvesting systems, solar-powered memory backup, and automotive telematics requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for LTC4071EMS8E#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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision instrumentation, industrial automation, communications, and automotive markets.
The LTC4071 product line delivers ultra-low-power battery management for micro-energy sources - designed specifically for energy harvesting, thin-film battery backup, and maintenance-free portable electronics where IQ, thermal safety, and minimal external components are critical.
FAQ
What is the exact float voltage accuracy of the LTC4071EMS8E#TRPBF over temperature?
The LTC4071EMS8E#TRPBF guarantees ±1% float voltage accuracy over the full –40°C to 125°C junction temperature range. This applies to all three pin-selectable settings: 4.0V (ADJ=GND), 4.1V (ADJ=open), and 4.2V (ADJ=VCC). The specification is validated per Analog Devices' Rev. D datasheet Table 1, with worst-case deviation measured at temperature extremes and process corners - ensuring reliable battery voltage regulation in automotive and industrial environments where thermal stability is critical. The LTC4071EMS8E#TRPBF maintains this accuracy without external calibration.
How does the LTC4071EMS8E#TRPBF achieve near-zero leakage during battery disconnect?
The LTC4071EMS8E#TRPBF achieves <0.025nA battery disconnect leakage by using a high-impedance PFET (MP1) gate control architecture that fully isolates BAT from VCC when VLBD is crossed. This is verified in the datasheet's Electrical Characteristics table (ILEAK = 0.01nA typ, 25nA max at VBAT = 2.65V). Unlike conventional chargers with parasitic paths, the LTC4071EMS8E#TRPBF disables internal bias networks and enters ultra-low-leakage state - preserving even 1mAh thin-film batteries for >10 years in storage. The LTC4071EMS8E#TRPBF achieves this without external FETs or complex sequencing.
Can the LTC4071EMS8E#TRPBF be used with non-Vishay NTC thermistors?
Yes - the LTC4071EMS8E#TRPBF supports custom NTC thermistors via resistor trimming. For thermistors with different B25/85 values (e.g., 3950), a series resistor (RFIX) can be added to shift the voltage divider ratio to match internal NTCTH thresholds (36.5%, 29.0%, etc.). Alternatively, RNOM bias resistor value can be adjusted (e.g., 88.7kΩ for 100kΩ thermistor) to realign trip points. The LTC4071EMS8E#TRPBF datasheet provides exact calculation methods and example values - confirming compatibility beyond Vishay curve 2 devices.
What is the maximum continuous shunt current rating for the LTC4071EMS8E#TRPBF in MSOP package?
The LTC4071EMS8E#TRPBF is rated for 50mA maximum continuous shunt current (ICCMAX), validated across –40°C to 125°C. At 50mA and VCC = 4.2V, power dissipation reaches 210mW. With θJA = 40°C/W (MSOP), this yields an 8.4°C junction rise above ambient - well within the 125°C TJMAX limit. Derating is unnecessary below 85°C ambient; the LTC4071EMS8E#TRPBF maintains full 50mA capability in standard industrial conditions without thermal throttling.
Does the LTC4071EMS8E#TRPBF require external components for basic operation?
No - the LTC4071EMS8E#TRPBF requires only one external component for core shunt charging: the input current-limiting resistor (RIN). All other functions - float voltage selection, low-battery disconnect, NTC qualification, and HBO status - are implemented internally. A 0.1µF decoupling capacitor on VCC is recommended but not mandatory for basic functionality. The LTC4071EMS8E#TRPBF eliminates external MOSFETs, op-amps, comparators, and sense resistors - reducing bill-of-materials to one passive part in simplest configurations.
LTC4071EMS8E#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Battery Chemistry:
- Lithium Ion/Polymer
- Number of Cells:
- -
- Current - Charging:
- -
- Programmable Features:
- -
- Fault Protection:
- -
- Charge Current - Max:
- -
- Battery Pack Voltage:
- 4.2V
- Voltage - Supply (Max):
- -
- Interface:
- -
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-MSOP-EP
LTC4071EMS8E#TRPBF FAQ
1.How can I place an order for LTC4071EMS8E#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC4071EMS8E#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 LTC4071EMS8E#TRPBF reliable?
The price and inventory of LTC4071EMS8E#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC4071EMS8E#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC4071EMS8E#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC4071EMS8E#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC4071EMS8E#TRPBF?
LTC4071EMS8E#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC4071EMS8E#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 LTC4071EMS8E#TRPBF?
For technical support, including LTC4071EMS8E#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC4071EMS8E#TRPBF requirements.
6.How does Aetrix verify that LTC4071EMS8E#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC4071EMS8E#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 LTC4071EMS8E#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC4071EMS8E#TRPBF?
All LTC4071EMS8E#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC4071EMS8E#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 LTC4071EMS8E#TRPBF part is unused and in its original packaging.
Return procedure for LTC4071EMS8E#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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