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Analog Devices Inc. LT3650EDD-4.2#TRPBF
- Part No.:
- LT3650EDD-4.2#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Battery Chargers
- Package:
- 12-WFDFN Exposed Pad
- Datasheet:
-
LT3650EDD-4.2#TRPBF.pdf
- Description:
- IC BATT CHG LI-ION 1CELL 12DFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,652
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Product details
Overview
LT3650EDD-4.2#TRPBF from Analog Devices (formerly Linear Technology) is a monolithic 2A step-down Li-Ion/Polymer battery charger IC with fixed 4.2V float voltage, 1MHz average current mode control, and integrated 2.5A switch. It operates from 4.75V to 32V input, supports C/10 or timer-based termination, and delivers ±0.5% float voltage accuracy for precision single-cell charging in industrial handheld instruments and 12V–24V automotive systems.
For engineers reviewing the LT3650EDD-4.2#TRPBF datasheet, LT3650EDD-4.2#TRPBF pinout, LT3650EDD-4.2#TRPBF application, or LT3650EDD-4.2#TRPBF equivalent, this page provides verified technical context, validated pin functions, confirmed 3mm × 3mm DFN-12 package mapping, real-world charge termination behavior, and two rigorously cross-checked alternative parts for high-voltage Li-Ion charging designs.
Technical Context
The LT3650EDD-4.2#TRPBF implements average current mode control with a 1MHz fixed-frequency PWM architecture, using internal voltage and current error amplifiers to servo directly to average inductor current via the SENSE–BAT differential sense path. Its 2.5A integrated switch is driven by a bootstrapped BOOST rail referenced to SW, enabling saturation and minimizing forward drop (350mV at 2A).
Charge management includes dual termination modes: C/10 detection (±2.5% accuracy) or programmable internal timer (±10% accuracy, typically 3 hours), with auto-restart triggered by 2.5% float voltage droop. Preconditioning activates below 2.9V BAT, reducing charge current to 15% of programmed IMAX until threshold is crossed.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Float Voltage | 4.2V ±0.5% - ensures precise full-charge termination for standard Li-Ion cells without overvoltage risk. |
| Max Charge Current | 2A programmable via external sense resistor - enables scalable power delivery with 100mV full-scale sense voltage. |
| Input Voltage Range | 4.75V to 32V - supports direct connection to 12V/24V automotive and industrial rails without pre-regulation. |
| Switch Current Limit | 2.5A - provides headroom above 2A continuous charge current for transient surges and thermal margin. |
| Termination Accuracy | C/10 detection ±2.5% - guarantees reliable end-of-charge signaling across temperature and load conditions. |
| Standby Current | 85µA - minimizes system quiescent draw when battery is fully charged and no recharge is needed. |
| NTC Monitoring | 0.29V–1.36V active range - corresponds to ~0°C–40°C battery temperature window with 5°C hysteresis per threshold. |
Pinout & Package
LT3650EDD-4.2#TRPBF is housed in a 3mm × 3mm, 12-pin plastic DFN package with exposed thermal pad (Pin 13 = GND). The package supports high-power dissipation (θJC = 3°C/W) and requires soldering the exposed pad to PCB ground for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (1) | Input supply rail | Accepts 4.75V–32V; powers internal circuitry and switch; requires ≥7.5V or BOOST–SW > 2V for startup. |
| CLP (2) | System current limit monitor | Enables dynamic charge current reduction to maintain total system input current; connect to VIN if unused. |
| SHDN (3) | Enable/disable control | 1.225V rising threshold with 120mV hysteresis; pulls VIN current to 15µA in shutdown. |
| CHRG (4) | Open-collector status output | Pulled low during active charging; high-impedance after termination; sinks up to 10mA. |
| FAULT (5) | Open-collector fault indicator | Pulled low on NTC fault, bad-battery condition, or timer timeout; high-impedance otherwise. |
| TIMER (6) | End-of-cycle timer programming | Connect capacitor to GND for time-based termination (e.g., 0.68µF = 3 hours); tie to GND for C/10 only. |
| RNG/SS (7) | Charge current programming | Sets max IMAX via voltage (0–1V range); sources 50µA; enables soft-start with external capacitor. |
| NTC (8) | Battery temperature monitor | Sources 50µA for 10kΩ B=3380 thermistor; disables charging if voltage <0.29V or >1.36V. |
| BAT (9) | Battery voltage feedback | Direct connection to battery anode; senses float voltage; triggers auto-recharge at 97.5% VFLT. |
| SENSE (10) | Current sense input | High-side sense node; 100mV full-scale corresponds to 2A IMAX; bias current <0.1µA post-termination. |
| BOOST (11) | Bootstrap supply for switch drive | Capacitor from BOOST to SW enables switch saturation; operating range 0V–4.5V relative to SW. |
| SW (12) | Switch output | Emitter of internal NPN switch; connects to inductor; forward drop ≤350mV at 2A. |
| SGND (13) | Signal and thermal ground | Exposed pad; must be soldered to PCB ground plane for thermal management and reference stability. |
Key Features
| Feature | Design Value |
|---|---|
| No blocking diode required | Integrated reverse-voltage protection eliminates external diode, reducing BOM count and forward drop loss. |
| Dynamic charge rate programming | RNG/SS pin allows real-time IMAX adjustment or soft-start via RC network-critical for inrush control. |
| Auto-precondition & bad-battery detection | Activates trickle-charge below 2.9V BAT; halts charging and asserts FAULT if battery fails to respond within 22.5 min. |
| Binary-coded status outputs | CHRG and FAULT pins provide unambiguous state signaling (charging, standby, NTC fault, timer fault) without I²C/SPI overhead. |
| Programmable input current limit | CLP pin enables system-level current budgeting-e.g., limiting total draw from USB-C PD or PoE-powered hosts. |
Applications
| Industrial Handheld Instruments | 12V–24V Automotive Systems |
|---|---|
|
Use Scenario: Portable multimeters, gas detectors, and ruggedized data loggers powered by single-cell Li-Ion batteries and charged from vehicle 12V/24V systems. IC Role / Device Role / Timing Role: Primary battery charger managing CC/CV profile, preconditioning deeply discharged cells, and monitoring battery temperature during field operation. Use Value: Enables direct connection to automotive rails without pre-regulator; 4.2V float accuracy prevents cell degradation; NTC monitoring ensures safe charging in varying ambient temperatures. |
Use Scenario: In-vehicle infotainment accessories, telematics modules, and ADAS camera power supplies requiring reliable Li-Ion backup during engine-off periods. IC Role / Device Role / Timing Role: High-voltage monolithic charger providing regulated 4.2V float, auto-restart on voltage sag, and fault-safe shutdown during cold cranking transients. Use Value: 32V absolute max input withstands load-dump spikes; 85µA standby current extends battery hold-up time; CLP pin allows coordinated current sharing with main system loads. |
| Desktop Cradle Chargers | Notebook Computers |
|
Use Scenario: Docking stations and charging cradles for tablets and medical devices that accept wide-input AC/DC adapters (e.g., 9–24V universal inputs). IC Role / Device Role / Timing Role: Standalone charging controller delivering 2A peak current, implementing C/10 or timer termination, and signaling charge status to host MCU via open-drain pins. Use Value: Eliminates need for external MOSFETs or controllers; 3mm × 3mm DFN footprint saves space in compact enclosures; binary status outputs simplify host firmware integration. |
Use Scenario: Secondary battery charging circuits in ultrabooks and 2-in-1 laptops where primary adapter supplies >12V and secondary cell requires isolated, accurate charging. IC Role / Device Role / Timing Role: Auxiliary Li-Ion charger supporting hot-swap battery replacement, preconditioning before main system boot, and seamless transition between AC and battery power. Use Value: Auto-recharge at 97.5% float voltage maintains optimal SOC; SHDN pin integrates with system PMIC for coordinated power sequencing; low 15µA shutdown current aids platform-level energy efficiency. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-voltage Li-Ion charging applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2617GQ-Z | 4.2V float, 2A max, 4.5V–36V input, but uses peak-current mode control and lacks integrated timer-based termination. | Requires external timer circuit for time-limited charging; no built-in bad-battery detection or auto-precondition logic. | Choose MP2617GQ-Z only if system already implements external timing/fault logic and requires wider 36V input range. |
| BQ24610RGER | 4.2V float, 3A max, 4.5V–28V input, supports external N-channel MOSFET switch and offers more flexible charge current programming via resistor ladder. | Lacks integrated switch - requires external high-side FET and gate driver; no CLP system current limit function. | Choose BQ24610RGER when higher than 2A charge current is needed and board space allows discrete switch implementation. |
Compared with LT3650EDD-4.2#TRPBF, MP2617GQ-Z trades integrated safety features for extended input voltage, while BQ24610RGER sacrifices monolithic simplicity for higher current scalability-neither offers the same combination of embedded timer, preconditioning, and system current limiting in a 3mm × 3mm DFN.
Availability
LT3650EDD-4.2#TRPBF is available at Aetrix Electronics and suitable for industrial handheld instruments, 12V–24V automotive systems, and desktop cradle chargers requiring stable component supply, long-term lifecycle support, and guaranteed lead-free compliance.
Supply support for LT3650EDD-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 precision instrumentation, automotive, and industrial markets.
The LT3650 product line was designed specifically for high-input-voltage, monolithic Li-Ion charging in space-constrained, thermally demanding applications-emphasizing integration, accuracy, and robust fault handling without external switches or controllers.
FAQ
What is the exact float voltage of the LT3650EDD-4.2#TRPBF?
The LT3650EDD-4.2#TRPBF has a nominal float voltage of 4.2V, specified as 4.18V to 4.24V over temperature and line conditions. This value is factory-trimmed and guaranteed to ±0.5% accuracy, making it suitable for standard single-cell Li-Ion and Li-Polymer batteries requiring precise 4.2V termination.
Does the LT3650EDD-4.2#TRPBF require an external blocking diode on the VIN rail?
No, the LT3650EDD-4.2#TRPBF does not require an external blocking diode on VIN. It incorporates internal reverse-voltage protection, allowing direct connection to input supplies up to 32V without risk of reverse current flow into the input source when the battery voltage exceeds VIN.
How is charge termination configured on the LT3650EDD-4.2#TRPBF?
Charge termination on the LT3650EDD-4.2#TRPBF is configurable via the TIMER pin: connect a capacitor to ground for time-based termination (e.g., 0.68µF = 3 hours), or tie TIMER to ground for C/10-only termination. Both modes are mutually exclusive and selected at hardware level-no register programming is involved.
What happens during preconditioning on the LT3650EDD-4.2#TRPBF?
When the BAT pin voltage falls below 2.9V, the LT3650EDD-4.2#TRPBF enters precondition mode, reducing charge current to 15% of the programmed maximum (set by RSENSE). If the battery fails to reach 2.9V within one-eighth of the programmed timer duration (e.g., 22.5 minutes for 3-hour timer), a bad-battery fault is asserted and charging halts.
Can the LT3650EDD-4.2#TRPBF operate from a 5V input supply?
Yes, the LT3650EDD-4.2#TRPBF can operate from a 5V input supply, but only if the BOOST–SW voltage exceeds 2V at startup. Since VIN = 5V is below the 7.5V minimum start-up threshold, the BOOST capacitor must be pre-charged via an external path (e.g., diode from BAT or auxiliary supply) to meet the bootstrap condition for initial switch enablement.
LT3650EDD-4.2#TRPBF 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:
- Timer
- Fault Protection:
- Over Temperature
- Charge Current - Max:
- 2A
- Battery Pack Voltage:
- 4.2V
- Voltage - Supply (Max):
- 32V
- Interface:
- -
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-DFN (3x3)
LT3650EDD-4.2#TRPBF FAQ
1.How can I place an order for LT3650EDD-4.2#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3650EDD-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 LT3650EDD-4.2#TRPBF reliable?
The price and inventory of LT3650EDD-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 LT3650EDD-4.2#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3650EDD-4.2#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3650EDD-4.2#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3650EDD-4.2#TRPBF?
LT3650EDD-4.2#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3650EDD-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 LT3650EDD-4.2#TRPBF?
For technical support, including LT3650EDD-4.2#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3650EDD-4.2#TRPBF requirements.
6.How does Aetrix verify that LT3650EDD-4.2#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3650EDD-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 LT3650EDD-4.2#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3650EDD-4.2#TRPBF?
All LT3650EDD-4.2#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3650EDD-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 LT3650EDD-4.2#TRPBF part is unused and in its original packaging.
Return procedure for LT3650EDD-4.2#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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