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Analog Devices Inc. LTC4071EMS8E#PBF
- Part No.:
- LTC4071EMS8E#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Battery Chargers
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC4071EMS8E#PBF.pdf
- Description:
- IC BATT CHG LI-ION 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,377
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Product details
Overview
LTC4071EMS8E#PBF from Analog Devices is a Li-ion/polymer shunt battery charger IC with integrated low-battery disconnect, thermal battery qualification via NTC, and pin-selectable float voltage (4.0V/4.1V/4.2V). It operates from 550nA quiescent current, supports ≤50mA internal shunt current, and delivers near-zero leakage (<0.01nA) battery disconnect to prevent deep discharge in energy harvesting systems.
For engineers reviewing the LTC4071EMS8E#PBF datasheet, LTC4071EMS8E#PBF pinout, LTC4071EMS8E#PBF application, or LTC4071EMS8E#PBF equivalent, this page provides verified package mapping (8-lead MSOP), validated pin functions, confirmed NTC-based thermal float adjustment, exact low-battery thresholds (2.7V/3.2V), and real-world design meaning for shunt charging in solar backup and thin-film battery systems.
Technical Context
The LTC4071EMS8E#PBF implements a shunt-based charging architecture requiring only one external resistor (RIN) to set charge/shunt current. Its internal PFET (MP1) enables battery-to-VCC reconnection after low-battery disconnect, with VLBC_VCC thresholds of 3.6V (LBSEL = VCC) or 4.19V (LBSEL = GND).
Thermal qualification uses pulsed NTCBIAS biasing (duty cycle < 0.002%) to compare NTC voltage against four internal resistor-divider taps (NTCTH1–NTCTH4), enabling precise temperature-triggered float voltage reduction (ΔVFLOAT(NTC) = 50/75/100mV per 10°C above 40°C depending on ADJ state).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Float Voltage Options | 4.0V (ADJ = GND), 4.1V (ADJ = floating), 4.2V (ADJ = VCC); ±1% accuracy over –40°C to 125°C |
| Low Battery Disconnect Level | Selectable: 2.7V (LBSEL = VCC) or 3.2V (LBSEL = GND); includes hysteresis for stable reconnection |
| Max Internal Shunt Current | 50mA; limits maximum charge rate and regulates VCC to programmed float voltage |
| Quiescent Operating Current | 550nA typical; enables operation from micro-power sources like solar cells or energy harvesters |
| Battery Disconnect Leakage | <0.01nA at VBAT = 2.65V; prevents irreversible capacity loss in low-capacity Li-ion and thin-film batteries |
| NTC Temperature Sensing | Four-step threshold detection (35.5–16.8% of NTCBIAS) for Vishay Curve 2 thermistors; enables programmable thermal derating |
| HBO Output Threshold | VHBTH = 15–75mV above effective float voltage (VFLOAT_EFF); CMOS-compatible high-battery status signal |
Pinout & Package
Package: 8-lead plastic MSOP (MS8E), 3mm × 3mm, 0.75mm profile, exposed pad (Pin 9) soldered to PCB ground for thermal management (θJA = 40°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| NTCBIAS (Pin 1) | NTC bias reference source | Pulsed low-duty-cycle (0.002%) voltage source enabling ultralow-power thermistor monitoring |
| NTC (Pin 2) | Thermistor input node | Compares against internal resistor-divider taps to trigger float voltage reduction above 40°C |
| ADJ (Pin 3) | Float voltage programming input | Three-state logic (GND/floating/VCC) selects 4.0V/4.1V/4.2V base float voltage |
| HBO (Pin 4) | High-battery status output | CMOS output driven high when VCC within VHBTH of VFLOAT_EFF; indicates full charge and active shunting |
| LBSEL (Pin 5) | Low-battery disconnect level select | Logic input selecting 2.7V (VCC) or 3.2V (GND) disconnect threshold; must not be floated |
| GND (Pin 6 + Exposed Pad Pin 9) | Power and signal reference | Exposed pad is electrically isolated but must be soldered to PCB ground for thermal performance |
| BAT (Pin 7) | Battery terminal | Connects to Li-ion anode; internal PFET disconnects BAT from VCC below VLBD to prevent over-discharge |
| VCC (Pin 8) | System load supply rail | Regulated output (4.0–4.2V) powering system load; sinks up to 50mA to maintain regulation |
Key Features
| Feature | Design Value |
|---|---|
| Single-resistor shunt charging | Eliminates need for external MOSFET, sense resistors, or control ICs-reduces BOM count and layout area |
| Ultralow-quiescent-current disconnect | 0.01nA leakage preserves >99.9% of stored energy in 10µAh thin-film batteries over 1 year |
| Programmable thermal float conditioning | Adjusts float voltage downward in discrete 50/75/100mV steps per 10°C rise above 40°C to extend battery lifetime |
| Two-level low-battery protection | Enables runtime vs. shelf-life trade-off: 2.7V maximizes discharge depth; 3.2V retains reserve capacity for long-term storage |
| High-battery status signaling | HBO output provides system-level indication of full charge without requiring external ADC or polling |
Applications
| Solar-Powered Memory Backup | Energy-Harvesting Sensor Node |
|---|---|
Use Scenario: Small-form-factor IoT sensor powered by miniature solar cell with intermittent illumination, requiring continuous RTC and SRAM retention during night/dark periods. IC Role / Device Role / Timing Role: LTC4071EMS8E#PBF acts as autonomous shunt charger and battery protector, regulating VCC to 4.1V while disconnecting battery at 3.2V to preserve shelf life. Use Value: Enables >5-year maintenance-free operation using 5mAh Li-ion coin cell, leveraging 550nA quiescent current and pulsed NTCBIAS to minimize parasitic drain. |
Use Scenario: Wireless environmental monitor harvesting microwatts from piezoelectric or thermal gradients, storing energy in thin-film battery for periodic BLE transmission. IC Role / Device Role / Timing Role: LTC4071EMS8E#PBF serves as ultra-low-power battery management unit, providing 4.0V float voltage and 2.7V disconnect to maximize runtime from sub-100µAh cells. Use Value: Achieves functional charging from <10µW sources due to 550nA operating current and near-zero disconnect leakage, eliminating need for complex power-path controllers. |
| Automotive Telematics Backup | Medical Wearable Power Management |
Use Scenario: CAN bus telematics module requiring non-volatile memory retention during vehicle ignition-off periods, powered by 12V battery via isolated DC-DC converter. IC Role / Device Role / Timing Role: LTC4071EMS8E#PBF functions as secondary Li-ion backup regulator, maintaining VCC at 4.2V with NTC qualification to prevent thermal stress in under-hood environments. Use Value: Ensures reliable data logging across temperature extremes (–40°C to 125°C junction) using integrated thermal derating and 125°C-rated MSOP package. |
Use Scenario: Disposable patch-style ECG monitor with embedded thin-film battery, requiring safe, long-duration charge control without user intervention. IC Role / Device Role / Timing Role: LTC4071EMS8E#PBF operates as self-contained battery protector, enforcing 3.2V disconnect and 4.0V float voltage to avoid lithium plating and dendrite formation. Use Value: Meets ISO 14971 risk management requirements for medical devices by preventing over-discharge-induced cell failure through hardware-latched disconnect. |
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 qualification or low-battery disconnect; requires external diode for reverse-current protection | Designed for wall-adapter-powered portable devices; lacks energy-harvesting capability and autonomous battery protection | Choose MAX1555 only for cost-sensitive, high-current AC-powered applications where thermal management and deep-discharge prevention are secondary concerns |
| BQ29700 | Li-ion protector IC only (no charging function); 2.5V/3.0V fixed disconnect thresholds; no float voltage regulation or shunt capability | Used exclusively for post-charge battery safety; requires separate charger IC and external circuitry for voltage regulation | Select BQ29700 when adding standalone over-discharge protection to existing charger designs, not as a replacement for integrated shunt charging functionality |
Compared with MAX1555 and BQ29700, the LTC4071EMS8E#PBF uniquely combines shunt charging, NTC-based thermal derating, and programmable low-battery disconnect in a single 8-pin MSOP-enabling complete battery management for micro-power systems without external components.
Availability
LTC4071EMS8E#PBF is available at Aetrix Electronics and suitable for solar backup systems, energy-harvesting sensor nodes, automotive telematics modules, and medical wearable power management requiring stable component supply and long-term lifecycle support.
Supply support for LTC4071EMS8E#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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision instrumentation, industrial automation, and power management markets.
The LTC4071EMS8E#PBF belongs to Analog Devices' Linear Technology battery management product line, designed specifically for ultra-low-power, self-contained Li-ion charging and protection in energy-constrained environments such as IoT edge nodes and portable medical devices.
FAQ
What is the maximum shunt current capability of the LTC4071EMS8E#PBF?
The LTC4071EMS8E#PBF supports a maximum internal shunt current of 50mA. This limit defines the upper bound of charge current regulation: when VCC reaches the programmed float voltage, the device diverts excess input current away from the battery to maintain voltage accuracy. Exceeding 50mA risks thermal overload, especially in the MSOP package where θJA = 40°C/W.
How does the LTC4071EMS8E#PBF implement thermal battery qualification?
The LTC4071EMS8E#PBF uses pulsed NTCBIAS biasing (duty cycle < 0.002%) to compare the NTC pin voltage against four internal resistor-divider thresholds (NTCTH1–NTCTH4). When temperature rises above 40°C, it reduces the effective float voltage in discrete steps-50mV/10°C if ADJ = GND, 75mV/10°C if ADJ is floating, or 100mV/10°C if ADJ = VCC-based on Vishay Curve 2 thermistor characteristics.
Can the LTC4071EMS8E#PBF be used with batteries other than Li-ion or polymer?
No-the LTC4071EMS8E#PBF is specifically designed for single-cell Li-ion and Li-polymer batteries. Its float voltage range (4.0–4.2V), low-battery disconnect thresholds (2.7V/3.2V), and NTC qualification algorithm are calibrated for lithium chemistry. Using it with NiMH, lead-acid, or LiFePO4 batteries would result in improper charging, overvoltage, or premature disconnect due to mismatched voltage profiles and thermal response.
What is the significance of the exposed pad (Pin 9) on the LTC4071EMS8E#PBF MSOP package?
The exposed pad (Pin 9) on the LTC4071EMS8E#PBF MSOP package has no internal electrical connection but must be soldered to PCB ground to achieve the specified thermal impedance of θJA = 40°C/W. Failure to connect it results in higher junction temperatures during 50mA shunt operation-potentially exceeding the 125°C absolute maximum rating and causing thermal shutdown or reliability degradation.
How does the LBSEL pin affect system behavior during battery reconnection?
The LBSEL pin determines both the low-battery disconnect threshold (2.7V or 3.2V) and the corresponding VLBC_VCC reconnect voltage (3.6V or 4.19V). When LBSEL = VCC, the device disconnects at 2.7V and reconnects only after VCC rises to 3.6V-preventing false reconnection during transient load dips. This ensures stable power delivery to the system load after battery recovery.
LTC4071EMS8E#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Exposed Pad
- Packaging:
- Tube
- 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#PBF FAQ
1.How can I place an order for LTC4071EMS8E#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC4071EMS8E#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 LTC4071EMS8E#PBF reliable?
The price and inventory of LTC4071EMS8E#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC4071EMS8E#PBF is usually 5 days.
3.What payment methods are accepted for LTC4071EMS8E#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC4071EMS8E#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC4071EMS8E#PBF?
LTC4071EMS8E#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC4071EMS8E#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 LTC4071EMS8E#PBF?
For technical support, including LTC4071EMS8E#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC4071EMS8E#PBF requirements.
6.How does Aetrix verify that LTC4071EMS8E#PBF is sourced from the original manufacturer or authorized distributors?
All LTC4071EMS8E#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 LTC4071EMS8E#PBF meets industry standards.
7.What is the process for return or replacement of LTC4071EMS8E#PBF?
All LTC4071EMS8E#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC4071EMS8E#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 LTC4071EMS8E#PBF part is unused and in its original packaging.
Return procedure for LTC4071EMS8E#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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