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Analog Devices Inc. LTC4070IMS8E#TRPBF
- Part No.:
- LTC4070IMS8E#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Battery Chargers
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC4070IMS8E#TRPBF.pdf
- Description:
- IC BATT CHG LI-ION 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,289
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Product details
Overview
LTC4070IMS8E#TRPBF from Analog Devices is a Li-ion/polymer shunt battery charger IC with 450nA quiescent current, ±1% float voltage accuracy (4.0V/4.1V/4.2V pin-selectable), and integrated NTC-based thermal qualification for battery protection. It delivers up to 50mA internal shunt current and supports external PFET boost to 500mA, enabling energy harvesting, solar backup, and thin-film battery charging in space-constrained industrial and automotive systems.
For engineers reviewing the LTC4070IMS8E#TRPBF datasheet, LTC4070IMS8E#TRPBF pinout, LTC4070IMS8E#TRPBF application, or LTC4070IMS8E#TRPBF equivalent, this page provides verified pin functions, NTC-qualified float voltage behavior, low-battery/high-battery status thresholds, thermal derating curves, and real-world shunt current limitations under varying VIN–VBAT conditions.
Technical Context
The LTC4070IMS8E#TRPBF implements a precision shunt regulation architecture where charge current is controlled by an external resistor (RIN) and battery voltage is clamped to a programmable float voltage via internal current sinking. Its 3-state ADJ pin decoder sets VFLOAT to 4.0V, 4.1V, or 4.2V with ±1% accuracy across –40°C to 125°C junction temperature.
Thermal qualification uses pulsed NTC biasing (duty cycle <0.002%) to compare NTC voltage against four internal reference taps, reducing VFLOAT in fixed 50mV/75mV/100mV steps per 10°C above 40°C depending on ADJ state. Status outputs HBO and LBO provide CMOS-compatible high-battery (±40mV threshold) and low-battery (3.2V nominal, 220–350mV hysteresis) indication without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VFLOAT Options | 4.0V / 4.1V / 4.2V - selected by ADJ pin logic level; enables precise cell voltage matching for diverse Li-ion chemistries. |
| Float Voltage Accuracy | ±1% over full temperature and shunt current range - ensures reliable long-term cell health without overvoltage stress. |
| Quiescent Current | 450nA typical at VCC = 3.1V - allows multi-year operation from micro-power sources like indoor PV or RF harvesters. |
| Max Internal Shunt Current | 50mA - limits power dissipation in RIN and sets upper bound for single-resistor charge control without external FET. |
| NTC Float Adjustment | –50mV/–75mV/–100mV per 10°C above 40°C - prevents thermal runaway by dynamically lowering charge voltage during elevated battery temperature. |
| LBO Threshold | 3.08V to 3.34V (typ. 3.2V) with 220–350mV hysteresis - provides robust low-voltage warning for system brownout management. |
| HBO Threshold | VFLOAT – 15mV to VFLOAT – 60mV (typ. VFLOAT – 40mV) with 100mV hysteresis - signals near-full charge while rejecting noise-induced false triggers. |
Pinout & Package
Package: 8-lead plastic MSOP (MS8E), 3mm × 3mm footprint, 0.75mm profile, exposed pad (Pin 9) for thermal enhancement and must be soldered to PCB ground.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| NTCBIAS (1) | NTC bias reference output | Provides pulsed 30pA average current to bias external 10kΩ NTC thermistor; minimizes self-heating error. |
| NTC (2) | NTC thermistor input | Compares thermistor voltage against four internal taps to trigger VFLOAT reduction at 40°C/50°C/60°C/70°C. |
| ADJ (3) | Float voltage programming input | Logic-low (GND) = 4.0V, floating = 4.1V, logic-high (VCC) = 4.2V; sampled every 1.5s to prevent leakage corruption. |
| HBO (4) | High battery status output | CMOS high when VCC ≥ VFLOAT_EFF – 40mV; pulls low with 100mV hysteresis to indicate charge completion. |
| GND (5) | Power and signal ground | Primary ground return; exposed pad (Pin 9) must be connected to PCB ground plane for θJA = 40°C/W. |
| LBO (6) | Low battery status output | CMOS high when VCC ≤ 3.2V; disables NTC/ADJ sampling and reduces ICCQ to 300nA to extend battery life. |
| DRV (7) | External PFET gate drive | Sinks 3µA max to enable external P-channel MOSFET for shunt current boost beyond 50mA; requires low-leakage layout. |
| VCC (8) | Battery input and regulated output | Accepts 3.1V–20V input; regulates to programmed VFLOAT; sinks up to 50mA internally or drives external PFET via DRV. |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow operating current | 450nA typical ICCQ enables >10-year shelf life in memory backup and energy harvesting applications. |
| Pin-selectable float voltage | Three precise VFLOAT options eliminate external DAC or resistor divider networks for chemistry-specific optimization. |
| NTC-based thermal qualification | Four-step VFLOAT reduction (down to 3.8V minimum) prevents Li-ion thermal degradation without external comparators. |
| Integrated status outputs | HBO and LBO provide direct system-level battery state monitoring with no external pull-ups or level-shifting required. |
| Simple shunt architecture | Single RIN resistor sets maximum charge/shunt current - eliminates complex feedback loops and reduces BOM count. |
Applications
| Solar-Powered Sensor Node | Automotive Memory Backup |
|---|---|
|
Use Scenario: Indoor photovoltaic panel charges thin-film Li-ion battery during daylight; system operates continuously from stored energy at night. IC Role / Device Role / Timing Role: LTC4070IMS8E#TRPBF acts as ultra-low-power shunt regulator, clamping battery voltage to 4.1V while consuming only 450nA when idle. Use Value: Enables >5-year maintenance-free operation using intermittent 10–100µA solar harvesters, with NTC qualification preventing overheating in parked vehicle cabins. |
Use Scenario: Maintains SRAM and real-time clock data during engine-off periods in infotainment and ADAS modules. IC Role / Device Role / Timing Role: LTC4070IMS8E#TRPBF provides fail-safe backup power with LBO flag signaling critical voltage drop before data loss. Use Value: Eliminates need for discrete supervisor ICs; 3.2V LBO threshold aligns with automotive cold-crank minimums, ensuring reliable brownout detection. |
| Industrial Energy Scavenging System | Medical Wearable Battery Management |
|
Use Scenario: Piezoelectric or RF harvester powers remote vibration sensor; battery recharges during equipment operation cycles. IC Role / Device Role / Timing Role: LTC4070IMS8E#TRPBF regulates intermittent microampere input currents into stable 4.2V storage with zero external components beyond RIN. Use Value: Supports sub-1µA average system current budgets; 50mA shunt capability handles burst-mode harvesters without external FETs. |
Use Scenario: Rechargeable Li-poly battery in continuous glucose monitor maintains 24/7 operation with periodic USB charging. IC Role / Device Role / Timing Role: LTC4070IMS8E#TRPBF serves as compact, thermally aware charger with NTC qualification to protect patient-worn battery from skin-contact heating. Use Value: Reduces thermal risk by lowering VFLOAT 100mV per 10°C above 40°C (ADJ = VCC), meeting IEC 62366 usability safety requirements. |
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; no NTC support; requires external resistors for VFLOAT setting; 25µA quiescent current. | Designed for wall-adapter-powered portable devices; lacks ultralow-power capability for energy harvesting. | Select MAX1555 only for cost-sensitive, high-current AC/DC applications where thermal qualification is unnecessary. |
| BQ29700 | Li-ion protector IC with 2.5V–4.3V adjustable overvoltage lockout; no shunt charging function; 1.5µA standby current. | Provides cell-level safety cutoff only; requires separate charger IC for charging functionality. | Choose BQ29700 when primary need is overvoltage protection rather than integrated shunt regulation and status monitoring. |
Compared with MAX1555 and BQ29700, the LTC4070IMS8E#TRPBF uniquely combines sub-microamp quiescent operation, pin-selectable float voltage, integrated NTC qualification, and dual-status outputs in a single 8-pin MSOP package-making it the only solution suitable for intermittent, micro-power charging with thermal safety assurance.
Availability
LTC4070IMS8E#TRPBF is available at Aetrix Electronics and suitable for solar power systems with backup, memory backup, and embedded automotive applications requiring stable component supply and long-term lifecycle support.
Supply support for LTC4070IMS8E#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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC4070IMS8E#TRPBF belongs to Analog Devices' Power Management product line, designed specifically for ultra-low-power battery charging and protection in energy-constrained environments such as IoT sensors and medical wearables.
FAQ
What is the maximum shunt current capability of the LTC4070IMS8E#TRPBF?
The LTC4070IMS8E#TRPBF provides up to 50mA of internal shunt current to regulate battery voltage. When higher current is needed, an external P-channel MOSFET can be driven via the DRV pin to boost total shunt capability to 500mA. The internal limit is enforced by the device's current-sinking architecture and thermal design, with absolute maximum ratings specifying ±60mA at the VCC pin.
How does the NTC qualification feature work in the LTC4070IMS8E#TRPBF?
The LTC4070IMS8E#TRPBF uses pulsed biasing of the NTCBIAS pin to measure the voltage ratio between an external NTC thermistor and a 10kΩ bias resistor. It compares this ratio against four internal reference taps to detect temperatures of 40°C, 50°C, 60°C, and 70°C. Based on the ADJ pin state, it reduces VFLOAT by 50mV, 75mV, or 100mV per 10°C increment above 40°C, down to a minimum of 3.8V.
Can the LTC4070IMS8E#TRPBF be used for multi-cell battery packs?
Yes - the LTC4070IMS8E#TRPBF supports stacked-cell configurations. Two or more devices can be cascaded in series by connecting the GND pin of the upper device to the VCC pin of the lower device. Each LTC4070IMS8E#TRPBF independently regulates its respective cell voltage, inherently balancing the stack without additional circuitry. Status outputs require level-shifting for non-ground-referenced top devices.
What is the purpose of the DRV pin on the LTC4070IMS8E#TRPBF?
The DRV pin on the LTC4070IMS8E#TRPBF is an open-drain output that sinks up to 3µA to drive the gate of an external P-channel MOSFET. This allows shunt current to exceed the internal 50mA limit - up to 500mA - while maintaining precise VFLOAT regulation. Layout best practices include minimizing trace capacitance and leakage to preserve low-quiescent performance.
Does the LTC4070IMS8E#TRPBF require external components for basic operation?
Yes - the LTC4070IMS8E#TRPBF requires only one external component for core shunt charging: a resistor (RIN) between the input source and VCC. Optional components include an NTC thermistor + bias resistor for thermal qualification, and an external PFET + gate resistor for boosted shunt current. No capacitors, op-amps, or feedback networks are needed for basic 4.0V/4.1V/4.2V regulation.
LTC4070IMS8E#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
LTC4070IMS8E#TRPBF FAQ
1.How can I place an order for LTC4070IMS8E#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC4070IMS8E#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 LTC4070IMS8E#TRPBF reliable?
The price and inventory of LTC4070IMS8E#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC4070IMS8E#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC4070IMS8E#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC4070IMS8E#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC4070IMS8E#TRPBF?
LTC4070IMS8E#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC4070IMS8E#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 LTC4070IMS8E#TRPBF?
For technical support, including LTC4070IMS8E#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC4070IMS8E#TRPBF requirements.
6.How does Aetrix verify that LTC4070IMS8E#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC4070IMS8E#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 LTC4070IMS8E#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC4070IMS8E#TRPBF?
All LTC4070IMS8E#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC4070IMS8E#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 LTC4070IMS8E#TRPBF part is unused and in its original packaging.
Return procedure for LTC4070IMS8E#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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