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Analog Devices Inc. LTC4002EDD-4.2#TRPBF
- Part No.:
- LTC4002EDD-4.2#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Battery Chargers
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LTC4002EDD-4.2#TRPBF.pdf
- Description:
- IC BATT CHG LI-ION 1CELL 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:13,271
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Product details
Overview
LTC4002EDD-4.2#TRPBF from Analog Devices (formerly Linear Technology) is a standalone constant-current/constant-voltage switch-mode Li-ion battery charger controller for single-cell (4.2 V) applications. It features 500 kHz PWM switching, ±1% float voltage accuracy, ±5% charge current accuracy, and integrated battery temperature qualification via NTC sensing. It is used in portable computing and handheld instrumentation where compact, efficient, and thermally safe charging is required.
For engineers reviewing the LTC4002EDD-4.2#TRPBF datasheet, LTC4002EDD-4.2#TRPBF pinout, LTC4002EDD-4.2#TRPBF application, or LTC4002EDD-4.2#TRPBF equivalent, key selection considerations include its 4.7–22 V input range, 10 µA sleep-mode battery drain, 3-hour charge timer, automatic recharge at 4.05 V/cell, and DFN-10 package thermal performance with exposed pad grounding.
Technical Context
The LTC4002EDD-4.2#TRPBF implements a current-mode PWM buck controller architecture with internal 100 mV current-sense reference and precision 2.465 V bandgap reference for 4.2 V/cell regulation. Its COMP pin serves dual roles: compensation node for both voltage and current loops, and soft-start/shutdown control interface.
It integrates dedicated circuitry for trickle charge (2.9 V threshold), end-of-charge detection (25% of full-scale current), NTC-based thermal qualification (355 mV hot / 2.465 V cold thresholds), and automatic sleep mode activation when VCC − VBAT < 250 mV - all without external microcontroller intervention.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Charge Voltage Accuracy | ±1% (4.158 V to 4.242 V at 25°C); ensures compliance with Li-ion cell voltage tolerance limits and prevents overvoltage stress. |
| Charge Current Accuracy | ±5% (90–110 mV sense threshold over −40°C to 85°C); enables precise setting of full-scale current via RSENSE = 100 mV / ICHG. |
| Switching Frequency | 450–550 kHz (typ. 500 kHz); allows use of small external inductors (e.g., 6.8 µH) and ceramic output capacitors while minimizing EMI. |
| Sleep Mode Current | 10–20 µA (at VCC removed); reduces reverse battery drain to extend shelf life and standby time in battery-powered systems. |
| NTC Thresholds | 340–370 mV (hot), 2.428–2.502 V (cold); supports standard 10 kΩ NTC thermistors (e.g., DALE NTHS-1206N02) for 0°C–50°C qualification window. |
| Recharge Threshold | 4.05 V per cell (ΔV = 150 mV offset); triggers automatic recharge after self-discharge, maintaining >80% state-of-charge without host intervention. |
| Input Voltage Range | 4.7 V to 22 V; accommodates wide-input wall adapters and USB PD sources while supporting high-efficiency operation across input variation. |
Pinout & Package
Package: 10-lead (3 mm × 3 mm) plastic DFN with exposed pad (pin 11 = PGND/SGND). Exposed pad must be soldered to PCB ground for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (COMP) | Compensation / Soft-Start / Shutdown Control | High-impedance node for loop compensation (RC network); pulling below 360 mV forces shutdown; 100 µA internal pull-up sets soft-start slew rate. |
| 2 (VCC) | Positive Supply Input | Accepts 4.7–22 V; requires local 0.1 µF + 10 µF low-ESR decoupling; powers internal circuits and gate driver. |
| 3 (GATE) | P-Channel MOSFET Gate Driver Output | Clamped to VCC − 8 V max; drives external high-side P-MOSFET with 20 ns rise / 50 ns fall times into 2000 pF load. |
| 4, 5, 11 (PGND, SGND, Exposed Pad) | Power / Signal / Thermal Ground | Common return for power paths, analog references, and heat dissipation; exposed pad must be soldered to PCB ground plane. |
| 6 (CHRG) | Open-Drain Charge Status Output | Pulled low during active charge; weak 25 µA pull-down at end-of-charge; high-impedance after timer expiry or shutdown. |
| 7 (BAT) | Battery Voltage Sense Input | Connects to battery anode via Kelvin trace; internal resistor divider sets 4.2 V float; bypassed with 22 µF ceramic capacitor. |
| 8 (SENSE) | Current-Sense Amplifier Input | Connected to low-side of RSENSE; develops 100 mV reference voltage for constant-current regulation (ICHG = 100 mV / RSENSE). |
| 9 (NTC) | NTC Thermistor Interface | 85 µA internal current source pulls up to sense voltage drop across 10 kΩ NTC; suspends charge if outside 0°C–50°C window. |
| 10 (NC) | No Connect | Not internally bonded; must remain unconnected on PCB. |
Key Features
| Feature | Design Value |
|---|---|
| Stable with ceramic output capacitors | Eliminates need for electrolytic or tantalum capacitors, reducing board area, cost, and failure risk in space-constrained portable designs. |
| Automatic battery recharge at 4.05 V/cell | Maintains >80% state-of-charge indefinitely without host firmware involvement, ideal for always-on instrumentation and docking stations. |
| Low 10 µA reverse battery drain in sleep mode | Extends shelf life and standby runtime in battery-backed systems where input supply may be intermittently disconnected. |
| Integrated 3-hour charge termination timer | Provides fail-safe cutoff independent of battery health or temperature, preventing overcharge in defective or aging cells. |
| Trickle charge for deeply discharged batteries | Enables safe recovery of cells down to 2.75 V with 10% full-scale current, avoiding lithium plating and capacity loss. |
Applications
| Portable Computers | Charging Docks |
|---|---|
|
Use Scenario: Integrated charging in ultrabooks and 2-in-1 tablets with single-cell Li-ion packs and wide-input AC adapters. IC Role / Device Role / Timing Role: Standalone buck-mode charger controller managing CC/CV profile, thermal qualification, and status signaling. Use Value: Enables compact, high-efficiency charging without MCU overhead; ±1% voltage accuracy protects cell longevity under variable input conditions. |
Use Scenario: Multi-port desktop charging station powering multiple devices simultaneously from a shared 12–20 V rail. IC Role / Device Role / Timing Role: Primary charge controller per port, coordinating with NTC sensing and CHRG status for user feedback. Use Value: Supports hot-plug safety via UVLO hysteresis and sleep mode; 500 kHz switching minimizes magnetic interference between adjacent ports. |
| Handheld Instruments | Medical Monitoring Devices |
|
Use Scenario: Battery-powered oscilloscopes, multimeters, and spectrum analyzers requiring reliable field recharging. IC Role / Device Role / Timing Role: Autonomous charger managing deep-discharge recovery, temperature-aware charging, and low-power sleep. Use Value: Trickle charge (2.9 V threshold) and automatic recharge (4.05 V) ensure readiness after long storage; 10 µA sleep current preserves battery for months. |
Use Scenario: Portable ECG, pulse oximeters, and infusion pumps needing certified, fail-safe battery management. IC Role / Device Role / Timing Role: Safety-critical charge supervisor enforcing thermal limits (0°C–50°C), voltage accuracy, and timer-based termination. Use Value: NTC qualification with hardware-enforced suspension eliminates software dependency; ±1% float voltage meets IEC 62368-1 battery safety margins. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Li-ion charger controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2617GQ-Z | Fixed 4.2 V output; no NTC input; uses external MOSFET but lacks integrated gate clamp; 2.5 A max charge current. | Targeted at cost-sensitive consumer electronics without thermal qualification requirements. | Select when NTC monitoring is unnecessary and higher current capability is needed; requires external gate protection circuitry. |
| BQ24075RGTR | Linear charger (not switch-mode); 1.5 A max; integrated MOSFET; no NTC support; 4.2 V ±0.5% accuracy. | Suitable only for low-power, low-heat applications with limited input-to-battery voltage differential (e.g., USB 5 V → 4.2 V). | Choose only for ultra-low-noise, space-constrained designs with <1 W dissipation budget; unsuitable for wide-input or high-current use cases. |
Compared with MP2617GQ-Z and BQ24075RGTR, the LTC4002EDD-4.2#TRPBF uniquely combines switch-mode efficiency across 4.7–22 V input, hardware-enforced thermal qualification, and autonomous 3-hour timer - making it the only option among the three qualified for industrial handhelds operating in variable ambient conditions.
Availability
LTC4002EDD-4.2#TRPBF is available at Aetrix Electronics and suitable for portable computers, charging docks, and handheld instrumentation requiring stable component supply, long-term lifecycle support, and guaranteed parametric compliance across −40°C to 85°C.
Supply support for LTC4002EDD-4.2#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 (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC4002EDD-4.2#TRPBF belongs to Linear's legacy Power Management portfolio, designed specifically for robust, autonomous Li-ion charging in space- and thermal-constrained portable systems without MCU supervision.
FAQ
What is the input voltage range supported by the LTC4002EDD-4.2#TRPBF?
The LTC4002EDD-4.2#TRPBF supports an input voltage range of 4.7 V to 22 V. This wide range accommodates common wall adapters, USB PD sources, and industrial power rails. Operation below 4.7 V triggers undervoltage lockout (UVLO), and the device enters sleep mode if VCC drops below (VBAT + 250 mV) or the UVLO threshold.
How does the LTC4002EDD-4.2#TRPBF handle battery temperature qualification?
The LTC4002EDD-4.2#TRPBF uses its NTC pin with an internal 85 µA current source to monitor a 10 kΩ NTC thermistor (e.g., DALE NTHS-1206N02). Charging suspends if the sensed voltage falls below 355 mV (≈50°C hot) or rises above 2.465 V (≈0°C cold). The CHRG pin remains unaffected during suspension, and charging resumes automatically when temperature returns to the valid window.
What is the purpose of the COMP pin on the LTC4002EDD-4.2#TRPBF?
The COMP pin on the LTC4002EDD-4.2#TRPBF serves three critical functions: (1) compensation node for both voltage and current control loops, (2) soft-start ramp generator (via internal 100 µA current source), and (3) manual shutdown input - pulling COMP below 360 mV disables the gate driver and places the device in 3 mA shutdown mode. A typical RC network (2.2 kΩ + 0.47 µF) provides stable loop response and ~2.35 ms soft-start.
Can the LTC4002EDD-4.2#TRPBF be used for two-cell (8.4 V) battery charging?
No - the LTC4002EDD-4.2#TRPBF is factory-configured for single-cell 4.2 V/cell operation. For two-cell applications, the pin-compatible LTC4002EDD-8.4 variant must be used, which has different internal resistor dividers, UVLO thresholds (7.5 V), and end-of-charge ratio (10% vs. 25%). Interchanging these variants will result in incorrect float voltage and unsafe charging behavior.
What is the maximum recommended charge current for the LTC4002EDD-4.2#TRPBF?
The LTC4002EDD-4.2#TRPBF does not impose a fixed maximum current limit; instead, full-scale charge current is set externally by RSENSE = 100 mV / ICHG. Design examples show operation up to 1.5 A (RSENSE = 68 mΩ). Practical limits depend on thermal design, MOSFET RDS(ON), inductor saturation, and PCB copper area - especially given the DFN-10 package's θJA = 43°C/W.
LTC4002EDD-4.2#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Battery Chemistry:
- Lithium Ion
- Number of Cells:
- 1
- Current - Charging:
- Constant - Programmable
- Programmable Features:
- Timer
- Fault Protection:
- -
- Charge Current - Max:
- -
- Battery Pack Voltage:
- 4.2V
- 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-4.2#TRPBF FAQ
1.How can I place an order for LTC4002EDD-4.2#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC4002EDD-4.2#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 LTC4002EDD-4.2#TRPBF reliable?
The price and inventory of LTC4002EDD-4.2#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC4002EDD-4.2#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC4002EDD-4.2#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC4002EDD-4.2#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC4002EDD-4.2#TRPBF?
LTC4002EDD-4.2#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC4002EDD-4.2#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 LTC4002EDD-4.2#TRPBF?
For technical support, including LTC4002EDD-4.2#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC4002EDD-4.2#TRPBF requirements.
6.How does Aetrix verify that LTC4002EDD-4.2#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC4002EDD-4.2#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 LTC4002EDD-4.2#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC4002EDD-4.2#TRPBF?
All LTC4002EDD-4.2#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC4002EDD-4.2#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 LTC4002EDD-4.2#TRPBF part is unused and in its original packaging.
Return procedure for LTC4002EDD-4.2#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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