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Analog Devices Inc. LTC4071EDDB#TRMPBF
- Part No.:
- LTC4071EDDB#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Battery Chargers
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC4071EDDB#TRMPBF.pdf
- Description:
- IC BATT CHG LI-ION 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:319
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Product details
Overview
LTC4071EDDB#TRMPBF from Analog Devices is a Li-ion/polymer shunt battery charger IC with integrated low-battery disconnect, thermal qualification via NTC, and programmable 4.0V/4.1V/4.2V float voltage. It operates from 550nA quiescent current, supports up to 50mA internal shunt current, and delivers near-zero leakage (<0.025nA) battery disconnect at 2.7V or 3.2V thresholds-enabling energy harvesting, thin-film battery backup, and solar-powered memory retention systems.
For engineers reviewing the LTC4071EDDB#TRMPBF datasheet, LTC4071EDDB#TRMPBF pinout, LTC4071EDDB#TRMPBF application, or LTC4071EDDB#TRMPBF equivalent, key selection criteria include shunt-based charging simplicity (single external resistor), ±1% float voltage accuracy over temperature, ultralow-power NTC sampling, and thermally enhanced 2mm × 3mm DFN-8 package with exposed pad for thermal management.
Technical Context
The LTC4071EDDB#TRMPBF implements a shunt-regulated architecture where charge current flows through an external resistor (RIN) into the battery via the internal PFET body diode until VCC reaches the low-battery connect threshold (VLBC_VCC), after which MP1 closes to directly connect BAT and VCC. Its 3-state ADJ pin decoder selects float voltage (GND = 4.0V, floating = 4.1V, VCC = 4.2V), while NTC monitoring uses pulsed 30–200µs biasing at ~0.003% duty cycle to reduce power consumption.
Low-battery disconnect is latching and near-zero-current: below VLBD, the internal switch opens and leakage remains ≤25nA across –40°C to 125°C; reconnection requires VCC to rise above VLBC_VCC (3.6V when LBSEL = VCC) to turn on MP1. HBO provides CMOS high-battery status with 40mV threshold and 100mV hysteresis referenced to effective float voltage (VFLOAT_EFF), including NTC-induced reductions.
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 full temperature range |
| Max Shunt Current | 50mA; limits maximum charge rate and regulates VCC without external FET or controller |
| Quiescent Current | 550nA typical at VCC; enables multi-year operation on microampere-scale energy harvesters |
| Low-Battery Disconnect | Selectable 2.7V (LBSEL = VCC) or 3.2V (LBSEL = GND); latching, <25nA leakage at 2.65V |
| NTC Thermal Qualification | Four-step voltage thresholds (36.5%/29.0%/22.8%/17.8% of NTCBIAS) match Vishay Curve 2 thermistor; reduces float voltage by 50/75/100mV per 10°C above 40°C |
| HBO Output | CMOS high-battery flag with 40mV rising threshold and 100mV hysteresis relative to VFLOAT_EFF |
| Operating Temp Range | –40°C to +125°C junction; validated for automotive and industrial embedded backup applications |
Pinout & Package
Package: 8-lead (2mm × 3mm) plastic DFN with 0.75mm profile and exposed thermal pad (Pin 9, not internally connected; must be soldered to PCB ground).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| NTCBIAS (1) | NTC bias reference source | Pulsed 30–200µs VCC output at ~0.003% duty cycle; powers external NTC/resistor divider with minimal average current (30–50pA avg) |
| NTC (2) | Thermistor input node | Compares against internal resistor divider taps to detect battery temperature; triggers ∆VFLOAT(NTC) reduction steps above 40°C |
| ADJ (3) | Float voltage programming input | 3-state logic: GND → 4.0V, floating → 4.1V, VCC → 4.2V; sampled every 1.2s (HBO high) or 3.6s (HBO low) |
| HBO (4) | High-battery status output | CMOS active-high signal indicating VCC ≥ VFLOAT_EFF – 40mV; sinks 1mA low, sources 0.5mA high |
| LBSEL (5) | Low-battery disconnect level select | GND → 3.2V disconnect, VCC → 2.7V disconnect; must be hard-wired, not floated |
| GND (6, 9) | Power and signal ground | Pin 6 is electrical ground; Pin 9 is exposed thermal pad-must be soldered to PCB ground plane for θJA = 76°C/W |
| BAT (7) | Battery terminal | Sources current to VCC when no input supply present; disconnects from VCC below VLBD to prevent deep discharge |
| VCC (8) | System load supply node | Regulated output (4.0/4.1/4.2V); sinks up to 50mA; decoupling capacitor ≥0.1µF required |
Key Features
| Feature | Design Value |
|---|---|
| Single-resistor shunt charging | Eliminates need for external MOSFET, current sense, or control loop-reduces BOM count and layout area |
| Ultralow-quiescent disconnect | ≤25nA leakage at 2.65V ensures >10-year shelf life for 10mAh thin-film batteries |
| Programmable thermal float adjustment | Four NTC thresholds map to 40/50/60/70°C; fixed ∆VFLOAT(NTC) steps preserve battery longevity at elevated temperatures |
| High-battery status with hysteresis | 40mV detection threshold + 100mV hysteresis prevents chatter during charge termination near VFLOAT_EFF |
| Thermally enhanced DFN package | 2mm × 3mm footprint with exposed pad achieves 76°C/W θJA, enabling 50mA shunt operation in compact designs |
Applications
| Energy Harvesting Backup | Solar-Powered Memory Retention |
|---|---|
|
Use Scenario: Indoor light-harvesting circuit powers RTC and SRAM using amorphous silicon photodiode delivering 5–50µA average current. IC Role / Device Role / Timing Role: LTC4071EDDB#TRMPBF acts as ultra-low-power shunt regulator and battery protector-charging thin-film Li-ion while enforcing 3.2V disconnect to maximize shelf life. Use Value: Enables >5-year maintenance-free operation without battery replacement; 550nA ICCQ ensures harvested energy isn't consumed by the charger itself. |
Use Scenario: Outdoor solar panel (2.5V–4.5V output) charges backup battery for industrial PLC nonvolatile memory during grid outages. IC Role / Device Role / Timing Role: LTC4071EDDB#TRMPBF regulates VCC to 4.2V float, monitors battery temperature via NTC, and disables charging above 70°C to prevent thermal runaway. Use Value: Prevents premature battery degradation in unventilated enclosures; NTC qualification extends usable cycle life by 3× versus fixed-voltage chargers. |
| Embedded Automotive Telematics | Medical Sensor Data Logger |
|
Use Scenario: CAN bus telematics module retains GPS position and crash data during vehicle ignition-off periods using supercapacitor-assisted Li-ion backup. IC Role / Device Role / Timing Role: LTC4071EDDB#TRMPBF provides latching 2.7V disconnect to maximize runtime, while HBO signals full charge to MCU for low-power sleep entry. Use Value: Eliminates need for discrete load switch and voltage supervisor; single-chip solution reduces footprint by 40% vs discrete alternatives. |
Use Scenario: Portable ECG patch records 72-hour waveform data onto flash memory; powered by printed Li-polymer battery charged intermittently via piezoelectric harvester. IC Role / Device Role / Timing Role: LTC4071EDDB#TRMPBF manages intermittent charging from µW-level mechanical energy, enforces 4.0V float for extended cell lifetime, and disconnects at 3.2V to preserve diagnostic accuracy. Use Value: Achieves 12-month clinical-grade data retention without battery replacement; 4.0V float setting increases cycle count to >500 vs 4.2V standard. |
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 current-limit resistor; no NTC support; 25µA quiescent current | Designed for wall-adapter charging only; unsuitable for energy harvesting due to high IQ | Select MAX1555 only for cost-sensitive, high-current AC-powered backup where thermal qualification is unnecessary |
| BQ29700 | Li-ion protector IC only-no charging function; 1.5µA IQ; fixed 2.5V/3.0V disconnect; no float voltage regulation | Requires separate charger IC; lacks integrated shunt regulation and voltage programming | Choose BQ29700 only when adding standalone protection to existing charger designs with strict size constraints |
Compared with MAX1555 and BQ29700, the LTC4071EDDB#TRMPBF uniquely integrates shunt charging, thermal qualification, and programmable disconnect in one 2mm × 3mm DFN-enabling self-contained, µA-scale energy harvesting solutions impossible with either alternative.
Availability
LTC4071EDDB#TRMPBF is available at Aetrix Electronics and suitable for energy harvesting backup, solar-powered memory retention, and embedded automotive telematics requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC4071EDDB#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 since 1965.
The LTC4071EDDB#TRMPBF belongs to Analog Devices' Power Management product line, engineered specifically for ultra-low-power battery charging and protection in energy-constrained environments such as IoT sensors and portable medical devices.
FAQ
What is the minimum input current required for the LTC4071EDDB#TRMPBF to initiate charging?
The LTC4071EDDB#TRMPBF begins regulating VCC as soon as input current exceeds its 550nA operating current-enabling charging from sources as low as 1µA. No minimum "start-up" current threshold exists; the device enters active regulation once VCC rises above the low-battery connect threshold (VLBC_VCC ≈ 3.6V with LBSEL = VCC), which occurs after sufficient charge accumulates via the internal PFET body diode.
How does the NTC qualification affect the effective float voltage of the LTC4071EDDB#TRMPBF?
The LTC4071EDDB#TRMPBF reduces float voltage in discrete 50mV (ADJ = GND), 75mV (ADJ = floating), or 100mV (ADJ = VCC) steps for each 10°C rise above 40°C, based on NTC thermistor voltage ratios matching internal thresholds NTCTH1–NTCTH4. At 70°C+, VFLOAT_EFF reaches its minimum: 3.800V (ADJ = GND), 3.800V (ADJ = floating), or 3.800V (ADJ = VCC)-ensuring safe operation under thermal stress.
Can the LTC4071EDDB#TRMPBF be used with batteries other than Li-ion or Li-polymer?
No-the LTC4071EDDB#TRMPBF is specifically designed for single-cell Li-ion and Li-polymer batteries with nominal voltages of 3.6V–3.7V and full-charge voltages of 4.0V–4.2V. Its float voltage options, disconnect thresholds, and NTC qualification curve are calibrated for these chemistries; using it with NiMH, LiFePO4, or lead-acid batteries would result in undercharging, overcharging, or incorrect thermal response.
What is the purpose of the exposed pad (Pin 9) on the LTC4071EDDB#TRMPBF DFN package?
The exposed pad (Pin 9) on the LTC4071EDDB#TRMPBF is not electrically connected internally but serves as a thermal interface-requiring direct soldering to the PCB ground plane to achieve the specified θJA = 76°C/W. Failure to connect it degrades thermal performance, risking junction temperature exceedance during 50mA shunt operation, especially in enclosed or high-ambient environments.
How does the HBO output behave during NTC-induced float voltage reduction?
The HBO output of the LTC4071EDDB#TRMPBF references the effective float voltage (VFLOAT_EFF), not the base programmed value-so its rising threshold becomes VFLOAT_EFF – 40mV and falling threshold becomes VFLOAT_EFF – 140mV (40mV + 100mV hysteresis). For example, with ADJ = VCC and NTC indicating 55°C, VFLOAT_EFF = 4.000V, making HBO rise at 3.960V and fall at 3.860V-ensuring accurate state indication despite thermal adjustment.
LTC4071EDDB#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)
LTC4071EDDB#TRMPBF FAQ
1.How can I place an order for LTC4071EDDB#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC4071EDDB#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 LTC4071EDDB#TRMPBF reliable?
The price and inventory of LTC4071EDDB#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC4071EDDB#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC4071EDDB#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC4071EDDB#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC4071EDDB#TRMPBF?
LTC4071EDDB#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC4071EDDB#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 LTC4071EDDB#TRMPBF?
For technical support, including LTC4071EDDB#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC4071EDDB#TRMPBF requirements.
6.How does Aetrix verify that LTC4071EDDB#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC4071EDDB#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 LTC4071EDDB#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC4071EDDB#TRMPBF?
All LTC4071EDDB#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC4071EDDB#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 LTC4071EDDB#TRMPBF part is unused and in its original packaging.
Return procedure for LTC4071EDDB#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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