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Analog Devices Inc. LTC4071IDDB#TRMPBF
- Part No.:
- LTC4071IDDB#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Battery Chargers
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC4071IDDB#TRMPBF.pdf
- Description:
- IC BATT CHG LI-ION 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:987
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Product details
Overview
LTC4071IDDB#TRMPBF 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 ±1%). It operates from intermittent or ultra-low-current sources (550nA quiescent), delivers up to 50mA internal shunt current, and protects batteries down to <0.1nA leakage in disconnect mode. It is used in energy harvesting systems powering thin-film or low-capacity backup batteries.
For engineers reviewing the LTC4071IDDB#TRMPBF datasheet, LTC4071IDDB#TRMPBF pinout, LTC4071IDDB#TRMPBF application, or LTC4071IDDB#TRMPBF equivalent, key selection criteria include its 550nA operating current, near-zero-leakage battery disconnect, programmable 2.7V/3.2V LBD thresholds, ±1% float voltage accuracy over temperature, and thermally enhanced 8-lead DFN (2mm × 3mm, 0.75mm height) package.
Technical Context
The LTC4071IDDB#TRMPBF implements a shunt-based charging architecture requiring only one external resistor (RIN) to set charge/shunt current. Its internal PFET (MP1) enables battery reconnection after low-voltage disconnect via VCC-sensed thresholds (VLBC_VCC = 3.6V for LBSEL = VCC), while pulsed NTCBIAS sampling (0.002% duty cycle) minimizes power consumption during thermal qualification.
Float voltage is dynamically adjusted using a 3-state ADJ decoder and four-step NTC comparator (NTCTH1–NTCTH4) matched to Vishay Curve 2 (B25/85 = 3490) thermistors. Each 10°C rise above 40°C reduces VFLOAT by 50mV (ADJ = GND), 75mV (ADJ = floating), or 100mV (ADJ = VCC), yielding VFLOAT_EFF as low as 3.80V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Operating Current | 550nA typical - enables charging from microwatt-scale energy harvesters without draining battery during idle. |
| Max Shunt Current | 50mA - sets upper limit on charge current regulation; determines minimum RIN for given input voltage. |
| Float Voltage Accuracy | ±1% over –40°C to 125°C - ensures reliable Li-ion cell voltage control across industrial temperature range. |
| Low Battery Disconnect Leakage | <0.1nA - prevents deep discharge damage even in multi-year storage of micro-batteries. |
| NTC Temperature Steps | 4 thresholds (36.5%, 29.0%, 22.8%, 17.8% of NTCBIAS) - provides discrete, stable thermal qualification without analog-to-digital conversion. |
| HBO Threshold Hysteresis | 100mV - prevents output chatter during slow VCC transitions near float voltage. |
| Package Thermal Resistance | θJA = 76°C/W (DFN) - requires minimal PCB copper area for thermal management at full 50mA shunt. |
Pinout & Package
The LTC4071IDDB#TRMPBF is housed in an 8-lead plastic DFN package (2mm × 3mm, 0.75mm height) with exposed pad (Pin 9) that must be soldered to PCB ground for thermal performance. Pin 9 is not electrically connected internally.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| NTCBIAS (1) | NTC bias reference source | Pulsed 0.002% duty-cycle VCC output; powers external NTC/resistor divider while minimizing average current drain. |
| NTC (2) | Thermistor voltage sense input | Compares against internal resistor ladder to detect battery temperature; triggers VFLOAT reduction when >40°C. |
| ADJ (3) | Float voltage programming select | GND = 4.0V, floating = 4.1V, VCC = 4.2V; sampled every 1.2s (HBO high) or 3.6s (HBO low) to reject board leakage errors. |
| HBO (4) | High battery status CMOS output | Active-high signal indicating VCC ≥ (VFLOAT_EFF – 40mV); hysteresis ensures clean transition during charge termination. |
| LBSEL (5) | Low battery disconnect threshold select | GND = 3.2V disconnect, VCC = 2.7V disconnect; fixed logic level required-no floating allowed. |
| GND (6, 9) | Power and signal reference | Pin 6 is functional ground; Pin 9 (exposed pad) is thermal slug only-must be soldered to PCB ground plane. |
| BAT (7) | Battery terminal | Sources current to VCC when no input supply present; disconnects from VCC below VLBD to prevent over-discharge. |
| VCC (8) | System load supply node | Regulated output (4.0/4.1/4.2V) powered by input via RIN; sinks up to 50mA to maintain regulation; decouple with ≥0.1µF capacitor. |
Key Features
| Feature | Design Value |
|---|---|
| Single-resistor shunt charging | Eliminates need for external MOSFET, op-amps, or precision references-reduces BOM count and layout complexity. |
| Ultralow-power NTC qualification | Reduces float voltage in 50/75/100mV steps per 10°C above 40°C without continuous bias current or ADC overhead. |
| Programmable low-battery disconnect | 2.7V or 3.2V thresholds allow trade-off between runtime extension and long-term battery shelf life. |
| High battery status output (HBO) | CMOS-compatible signal enables system-level charge state monitoring without additional sensing circuitry. |
| Thermally enhanced DFN package | 0.75mm profile supports space-constrained energy harvesting modules while maintaining θJA = 76°C/W. |
Applications
| Solar-Powered Sensor Node | Thin-Film Battery Backup |
|---|---|
|
Use Scenario: Indoor light-harvesting sensor node with 100µA average solar input powers wireless telemetry and RTC. IC Role / Device Role / Timing Role: LTC4071IDDB#TRMPBF acts as autonomous shunt charger and battery protector-regulating voltage, qualifying temperature, and disconnecting at 3.2V to preserve 10+ year shelf life. Use Value: Enables maintenance-free operation without firmware intervention or external supervision due to self-contained analog control loop. |
Use Scenario: Wearable medical patch uses 1.5mAh thin-film Li-ion battery charged intermittently by piezoelectric harvester. IC Role / Device Role / Timing Role: LTC4071IDDB#TRMPBF serves as ultra-low-quiescent battery manager-charging at 550nA, disconnecting below 2.7V, and pulsing NTCBIAS only when needed. Use Value: Prevents irreversible capacity loss from microamp-level parasitic loads during multi-month standby periods. |
| Memory Backup Power | Automotive Telematics Logger |
|
Use Scenario: Industrial PLC retains SRAM and real-time clock during AC mains failure using supercapacitor-assisted Li-ion backup. IC Role / Device Role / Timing Role: LTC4071IDDB#TRMPBF maintains precise 4.1V float voltage (ADJ floating) and disconnects at 3.2V to avoid memory corruption from brown-out. Use Value: Guarantees data integrity across power cycles with ±1% voltage accuracy and zero-maintenance battery protection. |
Use Scenario: OBD-II telematics module logs vehicle data during ignition-off periods using ambient vibration energy. IC Role / Device Role / Timing Role: LTC4071IDDB#TRMPBF functions as ruggedized battery supervisor-operating from –40°C to 125°C, adjusting float voltage above 40°C, and signaling full charge via HBO. Use Value: Extends operational lifetime in under-hood environments where thermal stress degrades conventional chargers. |
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 current; requires external FET for disconnect; no NTC support; 25µA quiescent current. | Designed for wall-adapter-powered portable devices-not optimized for µW harvesting or thermal qualification. | Select MAX1555 only if higher charge current and fixed 4.2V float are acceptable, and thermal protection is handled externally. |
| BQ29700 | Li-ion protector IC only-no charging function; 1.5µA quiescent; fixed 2.5V/3.0V LBD; no float voltage regulation or NTC interface. | Provides standalone over-discharge protection but cannot replace LTC4071IDDB#TRMPBF's integrated charge + protect + thermal qualification. | Choose BQ29700 only as supplemental protection layer alongside a separate charger; not a functional alternative. |
Compared with MAX1555 and BQ29700, the LTC4071IDDB#TRMPBF uniquely combines sub-µA quiescent operation, programmable float voltage, NTC-based thermal derating, and near-zero-leakage disconnect in a single 2mm × 3mm DFN-making it irreplaceable for energy-constrained, thermally variable, and maintenance-free battery systems.
Availability
LTC4071IDDB#TRMPBF is available at Aetrix Electronics and suitable for solar-powered sensor nodes, thin-film battery backup systems, and automotive telematics loggers requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for LTC4071IDDB#TRMPBF 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 industrial, automotive, communications, and healthcare markets.
The LTC4071IDDB#TRMPBF belongs to Analog Devices' Linear Technology legacy battery management portfolio, designed specifically for ultra-low-power, self-contained charging and protection of Li-ion/polymer cells in energy harvesting and backup applications.
FAQ
What is the maximum shunt current capability of the LTC4071IDDB#TRMPBF?
The LTC4071IDDB#TRMPBF supports a maximum internal shunt current of 50mA. This value defines the upper bound of regulated charge current and determines the minimum allowable input resistor (RIN) for a given input voltage. Exceeding this current causes the device to clamp VCC at the programmed float voltage, diverting all excess current away from the battery. The 50mA rating applies across the full –40°C to 125°C junction temperature range and is validated in the Absolute Maximum Ratings table.
How does the LTC4071IDDB#TRMPBF achieve near-zero leakage during battery disconnect?
The LTC4071IDDB#TRMPBF achieves <0.1nA battery disconnect leakage by turning off the internal PFET (MP1) and placing the BAT pin into a high-impedance state when VBAT falls below the selected VLBD threshold (2.7V or 3.2V). This physically isolates the battery from both the VCC load and the IC's own quiescent current path. The specification is verified at VBAT = 2.65V and is guaranteed over temperature, enabling safe multi-year storage of micro-batteries without capacity degradation.
Can the LTC4071IDDB#TRMPBF be used with non-Vishay NTC thermistors?
Yes, the LTC4071IDDB#TRMPBF supports custom NTC thermistors via external resistor tuning. For thermistors with different B25/85 values (e.g., 3950), a series resistor (RFIX) can be added to shift the voltage divider ratio to align with the internal NTCTH thresholds (36.5%, 29.0%, etc.). Alternatively, RNOM-the bias resistor from NTCBIAS to NTC-can be adjusted to recalibrate trip points. Both methods are documented in the Applications Information section of the datasheet.
What is the purpose of the pulsed NTCBIAS output on the LTC4071IDDB#TRMPBF?
The NTCBIAS pin on the LTC4071IDDB#TRMPBF outputs brief (30–200µs), low-duty-cycle (0.002%) pulses of VCC to bias the external NTC/resistor divider. This technique reduces average current consumption to ~50pA while preserving accurate temperature measurement. The pulse timing is synchronized with ADJ sampling, ensuring coordinated thermal and float voltage qualification without continuous power draw-critical for energy harvesting applications.
Does the LTC4071IDDB#TRMPBF require external components beyond RIN for basic operation?
For basic shunt charging and disconnect functionality, the LTC4071IDDB#TRMPBF requires only one external component: the input current-setting resistor RIN. However, optional features demand additional parts-e.g., an NTC thermistor + bias resistor for thermal qualification, a 0.1µF capacitor from VCC to GND for stability, and pull-up/down resistors on ADJ and LBSEL if not directly tied to rails. No external MOSFET, op-amp, or voltage reference is needed for core operation.
LTC4071IDDB#TRMPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-WFDFN 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-DFN (3x2)
LTC4071IDDB#TRMPBF FAQ
1.How can I place an order for LTC4071IDDB#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC4071IDDB#TRMPBF 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 LTC4071IDDB#TRMPBF reliable?
The price and inventory of LTC4071IDDB#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC4071IDDB#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC4071IDDB#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC4071IDDB#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC4071IDDB#TRMPBF?
LTC4071IDDB#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC4071IDDB#TRMPBF 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 LTC4071IDDB#TRMPBF?
For technical support, including LTC4071IDDB#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC4071IDDB#TRMPBF requirements.
6.How does Aetrix verify that LTC4071IDDB#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC4071IDDB#TRMPBF 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 LTC4071IDDB#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC4071IDDB#TRMPBF?
All LTC4071IDDB#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC4071IDDB#TRMPBF, 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 LTC4071IDDB#TRMPBF part is unused and in its original packaging.
Return procedure for LTC4071IDDB#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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