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Analog Devices Inc. LTC4070IDDB#TRPBF
- Part No.:
- LTC4070IDDB#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Battery Chargers
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC4070IDDB#TRPBF.pdf
- Description:
- IC BATT CHG LI-ION 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,854
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Product details
Overview
LTC4070IDDB#TRPBF from Analog Devices is a precision shunt-mode Li-ion/polymer battery charger IC designed for ultra-low-power energy harvesting systems. It delivers 450nA quiescent current, ±1% float voltage accuracy (4.0V/4.1V/4.2V pin-selectable), and 50mA internal shunt current - enabling reliable charging from intermittent solar or ambient sources into thin-film or backup batteries.
For engineers reviewing the LTC4070IDDB#TRPBF datasheet, LTC4070IDDB#TRPBF pinout, LTC4070IDDB#TRPBF application, or LTC4070IDDB#TRPBF equivalent, key selection criteria include NTC-qualified thermal float voltage adjustment, low-battery/high-battery status outputs (LBO/HBO), external PFET drive capability (DRV), and thermally enhanced 8-lead DFN (2mm × 3mm, 0.75mm height) packaging for space-constrained embedded designs.
Technical Context
The LTC4070IDDB#TRPBF implements a shunt-regulation architecture with a 3-state ADJ pin decoder to select 4.0V/4.1V/4.2V float voltages, each calibrated to ±1% over –40°C to 125°C junction temperature and full shunt current range (10µA–50mA). Its pulsed NTC bias circuit samples battery temperature every ~1.5s using a 30pA average sink current on NTCBIAS, enabling ultralow-power thermal qualification.
Internal regulation uses an error amplifier and shunt transistor to clamp VCC at the programmed float voltage; when VCC approaches VFLOAT_EFF, the device sinks increasing current via GND to divert charge away from the battery. The DRV output supports external PFETs to boost shunt current to 500mA while maintaining <3µA sink current into the DRV node.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Operating Current | 450nA typical quiescent current enables multi-year operation on microampere-scale energy harvesters. |
| Float Voltage Accuracy | ±1% over –40°C to 125°C and 10µA–50mA shunt current ensures stable cell voltage control without calibration. |
| Shunt Current | 50mA max internal; scalable to 500mA with external PFET via DRV pin for higher-power solar/battery systems. |
| NTC Float Adjustment | Programmable step-down: 50mV/75mV/100mV per 10°C above 40°C (ADJ = GND/FLOAT/VCC) for Li-ion thermal protection. |
| Status Outputs | LBO active-high below 3.2V (±120mV hysteresis); HBO active-high within 40mV of VFLOAT_EFF (±100mV hysteresis). |
| Package | 8-lead DFN (2mm × 3mm, 0.75mm height) with exposed pad - θJA = 76°C/W, rated for –40°C to 125°C operation. |
Pinout & Package
Package: 8-lead plastic DFN (2mm × 3mm, 0.75mm height), exposed thermal pad (Pin 9) must be soldered to PCB ground for thermal performance (θJA = 76°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| NTCBIAS (1) | NTC bias reference | Provides pulsed 30pA sink current to bias external 10kΩ NTC thermistor; minimizes power in thermal sensing path. |
| NTC (2) | Thermistor input | Compares NTC voltage against internal resistor-divider taps (NTCTH1–NTCTH4) to detect 40°C/50°C/60°C/70°C thresholds. |
| ADJ (3) | Float voltage selector | 3-state logic: GND = 4.0V, FLOAT = 4.1V, VCC = 4.2V; sampled every 1.5s to prevent board leakage corruption. |
| HBO (4) | High battery status output | CMOS output pulled high when VCC ≥ VFLOAT_EFF − 40mV; falls low when VCC drops >100mV below threshold. |
| GND (5) | Power and signal ground | Main return path for shunt current; exposed pad (Pin 9) must be connected to PCB ground for thermal compliance. |
| LBO (6) | Low battery status output | CMOS output pulled high when VCC ≤ 3.2V; hysteresis prevents chatter during slow discharge near 3.34V cutoff. |
| DRV (7) | External PFET gate driver | Open-drain output sinking ≤3µA; drives gate of P-channel MOSFET (e.g., Si3469DV) to extend shunt current to 500mA. |
| VCC (8) | Battery voltage input/output | Regulated node clamped to selected float voltage; sinks up to 50mA internally; requires ≥0.1µF decoupling if no battery present. |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow quiescent current | 450nA operating current enables >10-year shelf life in memory backup and energy harvesting applications. |
| Pin-selectable float voltage | Hardware-programmed 4.0V/4.1V/4.2V options eliminate need for external DAC or configuration registers. |
| NTC-qualified thermal regulation | Four-step voltage reduction (down to 3.8V minimum) protects Li-ion cells from thermal runaway above 40°C. |
| Integrated status monitoring | Dual CMOS outputs (LBO/HBO) provide direct system-level battery health indication without external comparators. |
| External PFET drive support | DRV pin enables seamless scaling to 500mA shunt current with low-Qg, high-VTH P-MOSFETs for high-power solar chargers. |
Applications
| Solar-Powered Remote Sensors | Embedded Automotive Memory Backup |
|---|---|
|
Use Scenario: Indoor/outdoor environmental sensors powered by miniature photovoltaic cells with intermittent illumination. IC Role / Device Role / Timing Role: Shunt regulator maintaining Li-ion cell at 4.1V float while dynamically reducing voltage to 3.8V during elevated ambient temperatures. Use Value: Enables >5-year maintenance-free operation using <100µA average harvest current, with thermal safety down to –40°C. |
Use Scenario: Non-volatile SRAM and real-time clock backup in automotive infotainment modules during engine-off periods. IC Role / Device Role / Timing Role: Low-leakage (300nA in LBO-active state) shunt charger preserving 3.2V–4.2V battery voltage across wide temperature swings. Use Value: Prevents data loss during 14-day vehicle dormancy while consuming <1µA average from backup cell. |
| Thin-Film Battery Energy Harvesting | Industrial IoT Edge Node Backup |
|
Use Scenario: Wireless vibration monitors using printed thin-film Li-ion batteries recharged by piezoelectric harvesters. IC Role / Device Role / Timing Role: Precision 4.2V float regulation with 1% accuracy ensures optimal capacity retention in low-capacity (<10mAh) cells. Use Value: Achieves >95% usable capacity utilization over 500+ charge cycles despite sub-1µA input current availability. |
Use Scenario: Programmable logic controllers with supercapacitor-assisted brownout recovery and long-term battery backup. IC Role / Device Role / Timing Role: Dual-status signaling (LBO/HBO) triggers firmware-controlled shutdown before critical 3.2V undervoltage threshold. Use Value: Eliminates need for external supervisor ICs, reducing BOM count and PCB area in DIN-rail mounted controllers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt-mode Li-ion battery charger applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX1555 | Higher 100µA quiescent current; fixed 4.2V float; no NTC support; 20mA max shunt current. | Limited to continuous high-current sources (e.g., USB); unsuitable for energy harvesting or thermal-critical deployments. | Select MAX1555 only for cost-sensitive, non-thermal, high-input-current applications where 450nA operation is unnecessary. |
| BQ29700 | Fixed 4.2V float; no ADJ pin; 1.5µA quiescent current; no DRV output; no NTC interface; 25mA shunt limit. | Designed for basic overvoltage protection only; lacks status outputs and thermal qualification for Li-ion safety compliance. | Choose BQ29700 solely for simple, single-function overvoltage clamping where LBO/HBO signaling and thermal adaptation are not required. |
Compared with MAX1555 and BQ29700, the LTC4070IDDB#TRPBF uniquely combines ultralow 450nA operation, programmable float voltage, integrated NTC thermal qualification, and DRV-driven external PFET support - making it the only viable option for certified energy harvesting and automotive-grade backup systems requiring full IEC 62368-1 thermal management.
Availability
LTC4070IDDB#TRPBF is available at Aetrix Electronics and suitable for solar-powered remote sensors, embedded automotive memory backup, and industrial IoT edge node backup requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for LTC4070IDDB#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, and power management markets.
The LTC4070 belongs to Analog Devices' Linear Technology battery management product line, engineered specifically for ultra-low-power, thermally adaptive shunt charging in energy-constrained and safety-critical applications.
FAQ
What is the operating temperature range for the LTC4070IDDB#TRPBF?
The LTC4070IDDB#TRPBF is specified for operation from –40°C to 125°C junction temperature. Its electrical characteristics - including ±1% float voltage accuracy and 450nA quiescent current - are guaranteed across this full range, with thermal performance dependent on PCB layout and exposed pad grounding per the DFN package requirements.
How does the ADJ pin configure the float voltage on the LTC4070IDDB#TRPBF?
The ADJ pin on the LTC4070IDDB#TRPBF selects one of three precise float voltages: tie ADJ to GND for 4.0V, leave ADJ floating for 4.1V, or connect ADJ to VCC for 4.2V. The LTC4070IDDB#TRPBF samples this state approximately every 1.5 seconds using a low-impedance internal circuit to reject board leakage effects and ensure stable programming.
Can the LTC4070IDDB#TRPBF support NTC thermistors other than Vishay NTHS0402N02N1002F?
Yes, the LTC4070IDDB#TRPBF supports alternate NTC thermistors by adjusting the NTCBIAS resistor (RNOM) value or adding a series fix resistor (RFIX) to align trip points (40°C/50°C/60°C/70°C) with the internal NTCTH1–NTCTH4 thresholds. For example, a 100kΩ thermistor with B25/85 = 3950 can be matched using RNOM = 88.7kΩ or RFIX = 3.92kΩ.
What is the maximum shunt current capability of the LTC4070IDDB#TRPBF without external components?
The LTC4070IDDB#TRPBF provides up to 50mA of internal shunt current to regulate battery voltage. This is the absolute maximum current it can sink through the VCC-to-GND path while maintaining ±1% float voltage accuracy. Exceeding 50mA requires an external PFET driven by the DRV pin to scale shunt current to 500mA.
How does the LTC4070IDDB#TRPBF reduce battery discharge current during low-voltage conditions?
When VCC falls below the LBO threshold (≤3.2V), the LTC4070IDDB#TRPBF disables NTC and ADJ sampling and reduces total supply current to ≤300nA (typical). This ultra-low standby mode extends backup runtime in memory retention applications, ensuring minimal self-discharge even during prolonged system dormancy.
LTC4070IDDB#TRPBF 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)
LTC4070IDDB#TRPBF FAQ
1.How can I place an order for LTC4070IDDB#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC4070IDDB#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 LTC4070IDDB#TRPBF reliable?
The price and inventory of LTC4070IDDB#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC4070IDDB#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC4070IDDB#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC4070IDDB#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC4070IDDB#TRPBF?
LTC4070IDDB#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC4070IDDB#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 LTC4070IDDB#TRPBF?
For technical support, including LTC4070IDDB#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC4070IDDB#TRPBF requirements.
6.How does Aetrix verify that LTC4070IDDB#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC4070IDDB#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 LTC4070IDDB#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC4070IDDB#TRPBF?
All LTC4070IDDB#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC4070IDDB#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 LTC4070IDDB#TRPBF part is unused and in its original packaging.
Return procedure for LTC4070IDDB#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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