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Analog Devices Inc. LTC4002EDD-8.4#PBF
- Part No.:
- LTC4002EDD-8.4#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Battery Chargers
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LTC4002EDD-8.4#PBF.pdf
- Description:
- IC BATT CHG LI-ION 2CELL 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,363
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Product details
Overview
LTC4002EDD-8.4#PBF from Analog Devices (formerly Linear Technology) is a standalone constant-current/constant-voltage switch-mode battery charger controller for two-cell (8.4V nominal) Li-ion batteries. It features 500kHz PWM switching, ±1% float voltage accuracy (8.4V), ±5% charge current accuracy via external sense resistor, and integrated battery temperature qualification using NTC thermistor input. It is used in portable medical instruments requiring reliable, thermally managed dual-cell charging from wide-input wall adapters.
For engineers reviewing the LTC4002EDD-8.4#PBF datasheet, LTC4002EDD-8.4#PBF pinout, LTC4002EDD-8.4#PBF application, or LTC4002EDD-8.4#PBF equivalent, key selection criteria include its 8.9–22V input range, 8.4V ±1% regulated float voltage, 3-hour programmable timer, end-of-charge detection at 10% of full current, and automatic recharge threshold at 4.05V per cell (8.1V total).
Technical Context
The LTC4002EDD-8.4#PBF implements a current-mode PWM buck topology with internal 100mV current-sense reference and precision 2.465V bandgap reference feeding a resistor divider to set 8.4V float voltage. Its COMP pin serves dual roles: inner-loop compensation node and shutdown control (≤350mV triggers shutdown).
It integrates battery temperature qualification via NTC pin with cold threshold at 2.465V (≈0°C) and hot threshold at 355mV (≈50°C), uses PGND/SGND separation for noise immunity in high-dI/dt paths, and clamps GATE drive to VCC – 8V to enable low-VGS P-channel MOSFETs. Sleep mode draws only 10µA when VCC < VBAT + 250mV.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Charge Voltage | 8.4V ±1% - precisely regulates two-cell Li-ion stack to prevent overvoltage stress and ensure cycle life. |
| Input Voltage Range | 8.9V to 22V - supports universal AC/DC adapters and industrial power rails without external pre-regulation. |
| Switching Frequency | 500kHz ±10% - enables compact magnetics and ceramic output capacitors while minimizing audible noise. |
| End-of-Charge Threshold | 10% of full-scale current - triggers near-EoC status via CHRG pin before timer expiration for system-level state awareness. |
| Trickle Charge Threshold | 4.7V to 5.3V - initiates safe low-current pre-charge for deeply discharged 2S batteries below safe CV entry voltage. |
| Recharge Threshold | 8.1V (4.05V/cell) - restarts charging automatically after self-discharge, maintaining >80% SoC without host intervention. |
| NTC Cold Threshold | 2.465V (≈0°C) - suspends charging if battery temperature falls below freezing, preventing lithium plating damage. |
Pinout & Package
Package: 10-lead (3mm × 3mm) plastic DFN with exposed thermal pad (Pin 11 = PGND/SGND). Requires soldering of exposed pad to PCB ground plane for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| NC (Pin 10) | No-connect | Not internally bonded; must be left floating or tied to GND per layout guidelines. |
| NTC (Pin 9) | Temperature sense input | Accepts voltage from 10kΩ NTC-to-ground; thresholds at 355mV (hot) and 2.465V (cold) to suspend charging outside 0°C–50°C. |
| SENSE (Pin 8) | Current sense amplifier input | Connects to low-side of external RSENSE; 100mV drop sets full charge current (ICHG = 100mV/RSENSE). |
| BAT (Pin 7) | Battery voltage feedback | High-impedance input for float voltage regulation; internal resistor divider sets 8.4V target with ±1% accuracy. |
| CHRG (Pin 6) | Open-drain charge status output | Pulled low during active charge; weak 25µA pull-down at near-EoC; high-Z after timer expiry or shutdown. |
| COMP (Pin 5) | Compensation / soft-start / shutdown | Internal 100µA current source sets soft-start slew rate; <350mV forces shutdown; external RC network stabilizes both CC/CV loops. |
| VCC (Pin 4) | Positive supply input | Accepts 8.9–22V; requires local 0.1µF + 10µF low-ESR decoupling; UVLO activates at 7.5V with 500mV hysteresis. |
| GATE (Pin 3) | P-channel MOSFET gate driver | Drives external high-side switch; clamped to VCC – 8V to support 8V-rated MOSFETs; 20ns/50ns rise/fall into 2000pF. |
| PGND (Pin 2) | Power ground return | Low-impedance path for high-frequency switch-node current; separate from SGND to reduce noise coupling. |
| SGND (Pin 1) | Signal ground reference | Reference for analog circuits (COMP, NTC, SENSE); connects to PGND only at single point near exposed pad. |
Key Features
| Feature | Design Value |
|---|---|
| Stable with ceramic output capacitor | Eliminates need for bulk electrolytic capacitors, reducing board area and improving reliability in space-constrained portable devices. |
| Automatic battery recharge | Resumes charging when battery voltage drops to 8.1V (4.05V/cell), enabling maintenance-free operation in always-connected applications. |
| ±5% charge current accuracy | Enables precise capacity-based charging without calibration, critical for medical-grade battery runtime predictability. |
| Low 10µA reverse battery drain | Extends shelf life and standby time when input is removed-essential for battery-backed instrumentation and emergency equipment. |
| Integrated NTC temperature qualification | Prevents charging outside 0°C–50°C using standard 10kΩ NTC, meeting IEC 62133 safety requirements for Li-ion systems. |
Applications
| Portable Medical Instruments | Industrial Handheld Scanners |
|---|---|
|
Use Scenario: Battery-powered ultrasound probe with dual 3.7V Li-ion cells operating from field-deployable AC adapter. IC Role / Device Role / Timing Role: Standalone 2S Li-ion charger controller managing CC/CV profile, temperature qualification, and automatic top-off. Use Value: Ensures safe, compliant charging across ambient temperatures while maintaining >80% SoC during intermittent use-critical for clinical readiness. |
Use Scenario: Rugged barcode scanner used in warehouse logistics with frequent hot-swap battery packs. IC Role / Device Role / Timing Role: Primary charging controller handling wide-input (12–24V DC) adapter compatibility and fast 1.5A charge cycles. Use Value: Enables rapid turnaround between shifts via 3-hour fixed-timer termination and immediate recharge on voltage sag, boosting device uptime. |
| Test & Measurement Equipment | Mobile Diagnostic Tools |
|
Use Scenario: Portable oscilloscope with removable 2S battery pack charged via universal lab power supply (12–20V). IC Role / Device Role / Timing Role: Precision voltage-regulated charger with ±1% float accuracy and low-noise 500kHz operation. Use Value: Prevents battery overvoltage degradation during long-term bench charging, preserving calibration stability and battery longevity. |
Use Scenario: Field-deployable ECG monitor requiring fail-safe charging in variable ambient conditions (0°C–40°C). IC Role / Device Role / Timing Role: Safety-critical charger enforcing NTC-based thermal cutoff and trickle-to-CC transition at 5V. Use Value: Meets medical regulatory requirements by halting charge outside safe thermal window, eliminating risk of thermal runaway. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Li-ion battery charger controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC4002ES8-8.4 | 8-lead SO package; higher θJA (110°C/W vs 43°C/W); same electrical specs and pinout mapping except NC/GND assignment. | Preferred for prototyping or lower-power designs where thermal load is moderate and through-hole or larger footprint acceptable. | Select LTC4002ES8-8.4 for manual assembly or legacy SO-compatible layouts; LTC4002EDD-8.4#PBF for space-constrained, high-density, thermally demanding PCBs. |
| BQ24725ARHDT | TI part with SMBus interface, adjustable charge voltage (7.2–8.8V), but no integrated NTC qualification or 3-hour timer; requires external MCU supervision. | Suitable for systems with host processor control and custom thermal management, not for autonomous operation. | Choose BQ24725ARHDT only if SMBus telemetry and programmable parameters are required-and external NTC circuitry can be added. |
Compared with LTC4002ES8-8.4, the LTC4002EDD-8.4#PBF offers superior thermal performance (θJA = 43°C/W) and smaller footprint, while BQ24725ARHDT trades autonomous safety features for digital configurability-making LTC4002EDD-8.4#PBF optimal for self-contained, safety-certifiable 2S charging.
Availability
LTC4002EDD-8.4#PBF is available at Aetrix Electronics and suitable for portable medical instruments, industrial handheld scanners, and test & measurement equipment requiring stable component supply, long-lifecycle assurance, and compliance-ready battery management.
Supply support for LTC4002EDD-8.4#PBF 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 (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management ICs, serving industrial, automotive, communications, and healthcare markets.
The LTC4002 product line delivers highly integrated, autonomous switch-mode Li-ion charger controllers optimized for space-constrained, thermally sensitive portable equipment-designed to eliminate external supervision while meeting stringent safety and accuracy requirements.
FAQ
What is the exact float voltage regulation accuracy of the LTC4002EDD-8.4#PBF?
The LTC4002EDD-8.4#PBF regulates battery float voltage to 8.4V with ±1% accuracy over –40°C to 85°C, achieved via an internal 2.465V precision reference and trimmed resistor divider. This ensures each cell remains within 4.158V–4.242V, critical for maximizing cycle life and avoiding overvoltage stress in two-cell Li-ion stacks.
Does the LTC4002EDD-8.4#PBF support automatic recharge, and at what voltage threshold?
Yes, the LTC4002EDD-8.4#PBF supports automatic recharge when the battery voltage drops to 8.1V (4.05V per cell) after full charge completion. This behavior is fixed and non-adjustable, ensuring the battery remains above 80% state-of-charge without host processor involvement-ideal for always-on portable instrumentation.
What is the purpose of the NC pin (Pin 10) on the LTC4002EDD-8.4#PBF DFN package?
The NC (No Connect) pin (Pin 10) on the LTC4002EDD-8.4#PBF is not internally bonded and serves no electrical function. Per Analog Devices layout guidance, it may be left floating or connected to GND to improve mechanical stability-however, it must never be driven or used as a signal path, as it has no internal connection to the die.
How does the LTC4002EDD-8.4#PBF handle battery temperature qualification?
The LTC4002EDD-8.4#PBF uses its NTC pin (Pin 9) to monitor a 10kΩ NTC thermistor to ground, suspending charge when voltage falls below 355mV (≈50°C) or rises above 2.465V (≈0°C). The internal 85µA pull-up current establishes these thresholds, and the timer freezes during suspension-ensuring compliance with IEC 62133 thermal safety mandates.
What is the minimum input voltage required for the LTC4002EDD-8.4#PBF to initiate charging?
The LTC4002EDD-8.4#PBF requires VCC to exceed 7.5V (UVLO threshold) and remain at least 250mV above battery voltage to begin charging. For example, with an 8.4V battery, VCC must be ≥8.9V-matching its specified 8.9V–22V input range and preventing unstable start-up near battery voltage.
LTC4002EDD-8.4#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-WFDFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Battery Chemistry:
- Lithium Ion
- Number of Cells:
- 2
- Current - Charging:
- Constant - Programmable
- Programmable Features:
- Timer
- Fault Protection:
- -
- Charge Current - Max:
- -
- Battery Pack Voltage:
- 8.4V
- Voltage - Supply (Max):
- 22V
- Interface:
- -
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-DFN (3x3)
LTC4002EDD-8.4#PBF FAQ
1.How can I place an order for LTC4002EDD-8.4#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC4002EDD-8.4#PBF 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 LTC4002EDD-8.4#PBF reliable?
The price and inventory of LTC4002EDD-8.4#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC4002EDD-8.4#PBF is usually 5 days.
3.What payment methods are accepted for LTC4002EDD-8.4#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC4002EDD-8.4#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC4002EDD-8.4#PBF?
LTC4002EDD-8.4#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC4002EDD-8.4#PBF 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 LTC4002EDD-8.4#PBF?
For technical support, including LTC4002EDD-8.4#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC4002EDD-8.4#PBF requirements.
6.How does Aetrix verify that LTC4002EDD-8.4#PBF is sourced from the original manufacturer or authorized distributors?
All LTC4002EDD-8.4#PBF 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 LTC4002EDD-8.4#PBF meets industry standards.
7.What is the process for return or replacement of LTC4002EDD-8.4#PBF?
All LTC4002EDD-8.4#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC4002EDD-8.4#PBF, 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 LTC4002EDD-8.4#PBF part is unused and in its original packaging.
Return procedure for LTC4002EDD-8.4#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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