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Analog Devices Inc. LTC4097EDDB#TRMPBF
- Part No.:
- LTC4097EDDB#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Battery Chargers
- Package:
- 12-WFDFN Exposed Pad
- Datasheet:
-
LTC4097EDDB#TRMPBF.pdf
- Description:
- IC BATT CHG LI-ION 1CELL 12DFN
- Quantity:
- Payment:
- Shipping:
Inventory:465
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Product details
Overview
LTC4097EDDB#TRMPBF from Analog Devices (acquired Linear Technology) is a standalone linear Li-ion/polymer battery charger IC supporting dual-input (DC wall adapter and USB) power source selection, fixed 4.2V float voltage with ±0.6% accuracy, programmable charge current up to 800mA from DCIN and 500mA from USBIN, and integrated thermal regulation at 115°C junction temperature - deployed in portable handheld devices requiring autonomous charging control.
For engineers reviewing the LTC4097EDDB#TRMPBF datasheet, LTC4097EDDB#TRMPBF pinout, LTC4097EDDB#TRMPBF application, or LTC4097EDDB#TRMPBF equivalent, key selection criteria include independent IDC/IUSB current programming, NTC-based temperature-qualified charging, VNTC 120mA bias output capability, and shutdown quiescent current of 20µA on DCIN and 10µA on USBIN.
Technical Context
The LTC4097EDDB#TRMPBF implements a constant-current/constant-voltage (CC/CV) charging algorithm with automatic input prioritization: DCIN takes precedence over USBIN when both are present and meet UVLO and voltage-margin conditions (e.g., VDCIN > BAT + 30mV). It uses two internal P-channel MOSFETs (RON-DC = 420mΩ, RON-USB = 470mΩ) eliminating external blocking diodes and sense resistors.
Thermal regulation operates via die-temperature feedback, reducing charge current above ~115°C to prevent overheating; a safety shutdown triggers at ~150°C. Charge termination is determined by an internal filtered comparator monitoring ITERM pin voltage (100mV threshold, 3ms filter), ensuring immunity to transient BAT load disturbances.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Float Voltage | 4.2V ±0.6% - ensures precise single-cell Li-ion full-charge termination without overvoltage stress. |
| Max DCIN Charge Current | 800mA (with RIDC = 1.24kΩ) - supports fast wall-adapter charging while maintaining thermal safety. |
| Max USBIN Charge Current | 500mA (with RIUSB = 2kΩ, HPWR = HIGH) - complies with USB 2.0 high-power port limits. |
| Termination Threshold | 50mA (with RITERM = 2kΩ) - enables reliable end-of-charge detection under varying battery ESR. |
| Junction Temp Limit | 115°C thermal regulation - dynamically scales charge current to sustain operation in compact enclosures. |
| VNTC Drive Capability | 120mA - powers external NTC bias network without additional regulators or buffers. |
| Shutdown Supply Current | 20µA (DCIN), 10µA (USBIN) - minimizes system standby power loss in battery-backed applications. |
Pinout & Package
Package: 12-lead (3mm × 2mm) DFN with exposed pad (Pin 13), thermally enhanced, 0.75mm profile, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DCIN (Pin 1) | Wall adapter input supply | Accepts 4.25–5.5V; powers charger and enables VNTC bias; max 1.2A continuous current. |
| USBIN (Pin 2) | USB input supply | Accepts 4.25–5.5V; automatically selected when DCIN absent or invalid; max 1A continuous. |
| VNTC (Pin 3) | NTC bias voltage output | Provides regulated 4.25–5.5V bias; sources up to 120mA; indicates valid input power presence. |
| CHRG (Pin 4) | Open-drain charge status | Pulled low during charging; high-Z at termination/shutdown; sinks up to 10mA for LED drive. |
| SUSP (Pin 5) | Charge enable/disable control | Logic low = active charge; internal 3.4MΩ pulldown defaults to enabled; logic high = shutdown. |
| NTC (Pin 6) | NTC thermistor input | Monitors battery temperature via voltage divider; suspends charge if cold (<0°C) or hot (>40°C). |
| HPWR (Pin 7) | USB high-power enable | Logic high = 100% programmed USB current; logic low = 20%; internal 3.4MΩ pulldown defaults low. |
| ITERM (Pin 8) | Charge termination threshold | Resistor-to-ground sets termination current (e.g., 2kΩ → 50mA); 100mV comparator threshold. |
| IUSB (Pin 9) | USB charge current program | Servos to 1V in CC mode; IBAT = VIUSB × 1000 / RIUSB; enables real-time current monitoring. |
| IDC (Pin 10) | DC charge current program | Servos to 1V in CC mode; IBAT = VIDC × 1000 / RIDC; independent of USB path for flexible design. |
| GND (Pin 11) | Power and signal ground | Primary reference for all analog and digital functions; connects to exposed pad for thermal conduction. |
| BAT (Pin 12) | Battery output and regulation node | Delivers charge current; regulates to 4.2V; requires no external compensation with battery attached. |
| Exposed Pad (Pin 13) | Thermal and electrical ground | Mandatory PCB solder connection; reduces θJA to 60°C/W; improves thermal regulation stability. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-input priority arbitration | Automatic DCIN-over-USBIN selection based on validated voltage margin and UVLO, eliminating external control logic. |
| Independent current programming | Separate RIDC and RIUSB resistors allow optimized wall/USB charge rates (e.g., 800mA/500mA) without compromise. |
| Integrated thermal regulation | On-die temperature feedback reduces charge current above 115°C, enabling robust operation in sealed enclosures. |
| NTC-based temperature qualification | Hardware-level cold/hot fault detection (0°C/40°C thresholds) with hysteresis prevents unsafe charging conditions. |
| Low-quiescent shutdown | 20µA DCIN / 10µA USBIN supply current in SUSP-high state preserves battery life during long-term storage. |
Applications
| Portable Medical Monitor | Industrial Handheld Scanner |
|---|---|
|
Use Scenario: Battery-powered vital sign monitor operating 12+ hours per charge in field deployments with intermittent access to wall or USB power. IC Role / Device Role: Standalone dual-input charger managing Li-ion cell health, temperature safety, and seamless source handover without MCU intervention. Use Value: Eliminates need for external microcontroller-based charging supervision; NTC integration ensures compliance with medical battery safety standards. |
Use Scenario: Rugged barcode scanner used in warehouse logistics, recharged via dock (DCIN) or PC USB port (USBIN) between shifts. IC Role / Device Role: Autonomous charge manager providing 800mA fast charge from dock and 500mA USB charge with HPWR-controlled current limiting. Use Value: Enables dual-mode charging infrastructure without redesign; thermal regulation prevents derating in high-ambient-temperature environments. |
| Consumer Bluetooth Headset | Smart Wearable Tracker |
|
Use Scenario: Compact wireless headset with 200mAh Li-polymer battery, charged via USB-C cable or proprietary wall adapter. IC Role / Device Role: Space-constrained linear charger delivering precise 4.2V float and trickle-charge recovery for deeply discharged cells. Use Value: 12-lead DFN package fits tight PCB layouts; 2µA battery drain in shutdown extends shelf life before first use. |
Use Scenario: Fitness tracker worn continuously, recharged nightly via USB; requires safe, temperature-aware charging near human skin. IC Role / Device Role: Temperature-monitored charger using NTC input to suspend charging above 40°C, preventing thermal discomfort or battery degradation. Use Value: Hardware-enforced thermal cutoff avoids firmware dependency; automatic recharge at 4.1V maintains >90% capacity without user action. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar standalone dual-input Li-ion charging applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX1555 | Fixed 4.2V float, 500mA max USB charge, no DCIN input, no NTC interface, no thermal regulation. | Only suitable for USB-only charging; lacks wall adapter support and temperature safety features. | Select only for cost-sensitive USB-only designs where thermal and NTC functionality are omitted. |
| BQ24075 | 4.2V float, 1.5A max charge, integrated USB detection, but no independent DCIN/USB current programming or VNTC bias output. | Requires external circuitry for dual-source priority and NTC biasing; higher quiescent current (75µA shutdown). | Prefer when higher charge current is needed and external bias/NTC circuitry is acceptable. |
Compared with MAX1555 and BQ24075, the LTC4097EDDB#TRMPBF uniquely delivers independent wall/USB current programming, integrated 120mA VNTC bias, and hardware thermal regulation - making it optimal for space-constrained, safety-critical dual-input portable systems.
Availability
LTC4097EDDB#TRMPBF is available at Aetrix Electronics and suitable for portable medical monitors, industrial handheld scanners, consumer Bluetooth headsets, smart wearables, and ruggedized IoT edge devices requiring stable component supply across extended production lifecycles.
Supply support for LTC4097EDDB#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, Inc. (ADI) acquired Linear Technology in 2017 and maintains its precision analog and power management portfolio with rigorous automotive-grade reliability and long-term product support.
The LTC4097EDDB#TRMPBF belongs to Linear's legacy high-accuracy battery management IC family, designed specifically for autonomous, dual-input Li-ion charging in space-constrained portable electronics where safety, thermal resilience, and minimal external components are critical.
FAQ
What is the maximum charge current supported by the LTC4097EDDB#TRMPBF from the wall adapter input?
The LTC4097EDDB#TRMPBF supports up to 800mA from the DCIN (wall adapter) input when configured with a 1.24kΩ resistor from the IDC pin to ground. This value is derived from the formula IBAT = VIDC × 1000 / RIDC, where VIDC servos to 1V in constant-current mode. The device's internal 420mΩ DCIN FET and thermal regulation ensure stable operation at this level under typical ambient conditions.
How does the LTC4097EDDB#TRMPBF handle simultaneous presence of DCIN and USBIN power sources?
The LTC4097EDDB#TRMPBF automatically selects DCIN over USBIN when both inputs are valid - defined as VDCIN > 4.2V and VDCIN > BAT + 30mV. If DCIN falls below these thresholds, it seamlessly transitions to USBIN without interruption. This priority behavior is implemented in hardware with no software or external logic required, ensuring robust source arbitration in portable systems.
Can the LTC4097EDDB#TRMPBF be used without an NTC thermistor?
Yes - the LTC4097EDDB#TRMPBF operates fully without an NTC thermistor. Leaving the NTC pin unconnected or floating disables temperature monitoring; charging proceeds normally. To explicitly disable the feature, pull the NTC pin below 0.017 × VNTC. The device retains all other functions including charge control, termination, and status indication regardless of NTC connection state.
What is the purpose of the VNTC pin on the LTC4097EDDB#TRMPBF, and what load can it drive?
The VNTC pin on the LTC4097EDDB#TRMPBF provides a regulated bias voltage (4.25–5.5V) to power the NTC thermistor divider network and serves as a power-present indicator. It is actively driven when either DCIN or USBIN meets UVLO and voltage-margin requirements. The pin can source up to 120mA continuously, enabling direct biasing of standard 100kΩ NTC networks without external regulators or buffers.
How does the LTC4097EDDB#TRMPBF achieve thermal regulation, and at what temperature does it activate?
The LTC4097EDDB#TRMPBF uses an on-die temperature sensor to activate thermal regulation when junction temperature reaches approximately 115°C. At this point, it dynamically reduces charge current to maintain a constant die temperature - not ambient - allowing sustained operation in thermally constrained PCB layouts. A secondary safety shutdown triggers at ~150°C to prevent permanent damage.
LTC4097EDDB#TRMPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 12-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Battery Chemistry:
- Lithium Ion/Polymer
- Number of Cells:
- 1
- Current - Charging:
- Constant - Programmable
- Programmable Features:
- Current
- Fault Protection:
- -
- Charge Current - Max:
- 1.2A
- Battery Pack Voltage:
- 4.2V
- Voltage - Supply (Max):
- 5.5V
- Interface:
- USB
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-DFN (3x2)
LTC4097EDDB#TRMPBF FAQ
1.How can I place an order for LTC4097EDDB#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC4097EDDB#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 LTC4097EDDB#TRMPBF reliable?
The price and inventory of LTC4097EDDB#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC4097EDDB#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC4097EDDB#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC4097EDDB#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC4097EDDB#TRMPBF?
LTC4097EDDB#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC4097EDDB#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 LTC4097EDDB#TRMPBF?
For technical support, including LTC4097EDDB#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC4097EDDB#TRMPBF requirements.
6.How does Aetrix verify that LTC4097EDDB#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC4097EDDB#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 LTC4097EDDB#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC4097EDDB#TRMPBF?
All LTC4097EDDB#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC4097EDDB#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 LTC4097EDDB#TRMPBF part is unused and in its original packaging.
Return procedure for LTC4097EDDB#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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