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Analog Devices Inc. LT3652IDD#TRPBF
- Part No.:
- LT3652IDD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Battery Chargers
- Package:
- 12-WFDFN Exposed Pad
- Datasheet:
-
LT3652IDD#TRPBF.pdf
- Description:
- IC BATT CHG MULTI-CHEM 12DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,346
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Product details
Overview
LT3652IDD#TRPBF from Analog Devices (formerly Linear Technology) is a monolithic 2A step-down battery charger IC with integrated 35V/2.5A switch, designed for solar-powered LiFePO₄, Li-ion, and SLA battery systems. It delivers constant-current/constant-voltage charging, supports input voltage regulation (MPPT), programmable float voltage up to 14.4V, C/10 or timer-based termination, and operates from 4.95V to 32V input. Used in remote monitoring stations and 12–24V automotive auxiliary power systems.
For engineers reviewing the LT3652IDD#TRPBF datasheet, LT3652IDD#TRPBF pinout, LT3652IDD#TRPBF application, or LT3652IDD#TRPBF equivalent, key selection considerations include its 1MHz fixed-frequency buck architecture, 0.5% float voltage reference accuracy, 5% charge current accuracy, thermal foldback protection, and binary-coded open-collector status outputs (CHRG/FAULT) for system-level fault reporting.
Technical Context
The LT3652IDD#TRPBF implements average-current-mode control with a 1MHz fixed-frequency PWM controller, using internal voltage (V-EA) and current (C-EA) error amplifiers to servo both output voltage (via VFB) and average charge current (via SENSE–BAT differential). Its input regulation loop dynamically reduces charge current to maintain VIN_REG ≥ 2.7V - enabling peak power tracking for solar panels.
It integrates preconditioning (15% max current below 70% float voltage), auto-recharge at 2.5% float voltage drop, NTC-based 0°C–40°C temperature supervision, and dual termination modes: C/10 detection (2.5% accuracy) or programmable safety timer (±10% accuracy, up to 3 hours with 0.68µF).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.95V to 32V (40V absolute max); enables direct connection to unregulated solar arrays or 24V industrial rails without external pre-regulation. |
| Max Charge Current | Up to 2A (programmable via RSENSE = 0.05Ω); supports fast charging of 2-cell LiFePO₄ (7.2V) or 3-cell SLA (9V) packs. |
| Float Voltage Accuracy | ±0.5% (3.3V internal reference); ensures ±72mV precision at 14.4V float, critical for LiFePO₄ longevity and SLA gassing control. |
| C/10 Detection Accuracy | ±2.5%; guarantees reliable termination at 200mA for 2A charge profile, minimizing overcharge risk in sealed batteries. |
| Switch On-Resistance | 0.175Ω (typical); limits conduction loss to ≤700mW at 2A, supporting >88% efficiency at 20VIN/8.2VBAT. |
| Standby Current | 85µA (post-termination); extends host system battery life during idle periods in remote deployments. |
| Operating Frequency | 1MHz fixed; allows compact magnetics (e.g., 10µH) and reduces EMI filtering burden in space-constrained enclosures. |
Pinout & Package
LT3652IDD#TRPBF is housed in a thermally enhanced 12-lead 3mm × 3mm DFN package with exposed pad (Pin 13 = GND), rated for –40°C to 125°C junction temperature. The exposed pad must be soldered to PCB ground for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (1) | Input supply rail | Accepts 4.95–32V; powers internal circuitry and switch; requires ≥10µF low-ESR ceramic decoupling. |
| VIN_REG (2) | MPPT regulation reference | Setpoint for input voltage regulation loop; connect resistor divider from VIN to enable solar panel peak power tracking. |
| SHDN (3) | Precision enable/disable control | 1.2V threshold (120mV hysteresis); pulls IC into 15µA shutdown when <0.4V; supports system-level UVLO. |
| CHRG (4) | Open-collector status output | Sinks 10mA when charging active or fault detected; high-Z after C/10 or timer termination. |
| FAULT (5) | Open-collector fault indicator | Sinks 10mA on temperature fault or bad-battery condition; remains high-Z during normal CV/CC operation. |
| TIMER (6) | Charge cycle timer programming | Connect capacitor to ground for time-based termination (e.g., 0.68µF = 3hr full cycle + 22.5min precondition limit). |
| VFB (7) | Float voltage feedback node | 3.3V internal reference; program battery float voltage up to 14.4V with resistor divider; auto-recharge triggers at −2.5%. |
| NTC (8) | Battery temperature monitor input | Sources 50µA for 10kΩ B=3380 thermistor; disables charging if voltage <0.29V (>40°C) or >1.36V (<0°C). |
| BAT (9) | Battery output sense/reference | Connects to battery positive; reference for SENSE pin; bias current drops to <0.1µA post-termination to minimize self-discharge. |
| SENSE (10) | Current sense input | Measures voltage across RSENSE; 100mV = full-scale (2A); bias current <0.1µA post-termination. |
| BOOST (11) | Bootstrap supply for switch drive | Connect ≥1µF capacitor to SW; enables saturation of internal switch for low RDS(on) and high efficiency. |
| SW (12) | Switch node output | Drives external inductor; connects internally to emitter of NPN switch; voltage swing limited to VIN–0.35V. |
| GND (13) | Power and thermal ground | Exposed pad must be soldered to PCB ground plane; provides primary thermal path (θJC = 3°C/W). |
Key Features
| Feature | Design Value |
|---|---|
| Input voltage regulation (MPPT) | Maintains solar panel at VMPPT by dynamically throttling charge current - achieves >98% peak power tracking efficiency. |
| Multi-chemistry support | Resistor-programmable float voltage (up to 14.4V) and preconditioning enable safe charging of LiFePO₄, Li-ion, and SLA without firmware changes. |
| Dual termination modes | Configurable C/10 detection or programmable timer (3hr typical) - supports top-off charging below C/10 while preventing indefinite float. |
| Integrated battery temperature supervision | Hardware-based NTC monitoring with 5°C hysteresis per threshold - eliminates need for MCU polling or external comparators. |
| Low-quiescent standby mode | 85µA supply current after termination - extends runtime in battery-backed remote sensors and IoT edge nodes. |
Applications
| Solar-Powered Remote Monitoring Station | LiFePO₄-Based Portable Medical Device |
|---|---|
|
Use Scenario: Off-grid environmental sensor node powered by 17VOC solar panel, charging 7.2V (2S) LiFePO₄ battery for multi-year deployment. IC Role / Device Role / Timing Role: Primary battery management IC performing MPPT, CC/CV charging, temperature supervision, and auto-recharge - replaces discrete DC-DC + supervisor + microcontroller. Use Value: Eliminates external MPPT controller; achieves >98% solar energy harvest; prevents LiFePO₄ overvoltage (≤3.65V/cell) via 0.5% VREF accuracy. |
Use Scenario: Portable ultrasound or infusion pump with hot-swap 7.2V LiFePO₄ pack, requiring safe, maintenance-free charging from AC adapter or vehicle port. IC Role / Device Role / Timing Role: Standalone charger managing precondition, full-charge, and thermal cutoff - operates autonomously without host processor intervention. Use Value: Guarantees cell-level voltage compliance (±72mV at 14.4V); halts charge at 40°C via hardware NTC path; restarts automatically after battery replacement. |
| 12V–24V Automotive Auxiliary Power System | Industrial Backup Power for RTU/PLC |
|
Use Scenario: Telematics unit powered from vehicle battery (12–16V nominal, up to 32V load dump), charging sealed lead-acid backup battery. IC Role / Device Role / Timing Role: Robust buck charger with wide VIN range, input overvoltage protection (40V abs max), and SLA-specific float voltage programming. Use Value: Survives automotive transients without external TVS; programs 13.8V float for SLA via resistor divider; terminates at C/10 to prevent water loss. |
Use Scenario: Remote terminal unit in utility substation with 24V DC plant power, charging 24V SLA battery for grid outage resilience. IC Role / Device Role / Timing Role: Primary charging controller interfacing with 24V rail and battery bank; provides status signaling (CHRG/FAULT) to host MCU via open-collector pins. Use Value: Binary status outputs simplify host firmware; 85µA standby current minimizes drain during extended outages; timer-based termination prevents overcharge during infrequent usage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar battery charger applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC4000-1 | External MOSFET controller (no integrated switch); supports higher currents (>5A) and wider chemistries including NiCd/NiMH; requires external sense amp and gate drivers. | Used where scalability, multi-cell series support (≥12S), or non-Li chemistries are required; not suitable for space-constrained 2A designs. | Select LTC4000-1 only when needing >2A output or flexible topology; LT3652IDD#TRPBF offers lower BOM count and smaller footprint for ≤2A solar/SLA/LiFePO₄. |
| BQ24610RTWR | TI buck charger with 2.5A max current, but lacks MPPT input regulation loop and has ±1% float voltage accuracy (vs. ±0.5%); uses analog current programming instead of resistor-based VFB. | Targeted at cost-sensitive industrial chargers without solar input; no native NTC interface - requires external ADC or comparator. | Choose BQ24610RTWR for high-volume non-solar applications where ±1% float tolerance is acceptable; LT3652IDD#TRPBF is preferred for solar MPPT and precision LiFePO₄. |
Compared with LTC4000-1 and BQ24610RTWR, the LT3652IDD#TRPBF uniquely integrates MPPT regulation, 0.5% float accuracy, and hardware NTC supervision in a 3mm × 3mm DFN - delivering the highest level of autonomous, solar-optimized charging in minimal area.
Availability
LT3652IDD#TRPBF is available at Aetrix Electronics and suitable for solar-powered remote monitoring stations, LiFePO₄-based portable medical devices, and 12V–24V automotive auxiliary power systems requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for LT3652IDD#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 LT3652 product line was designed specifically for mid-power, high-input-voltage battery charging in off-grid and harsh-environment applications - emphasizing integration, solar MPPT capability, and multi-chemistry flexibility without MCU dependency.
FAQ
What is the maximum input voltage rating for the LT3652IDD#TRPBF?
The LT3652IDD#TRPBF has an absolute maximum input voltage rating of 40V on the VIN pin. Its operational input voltage range is specified from 4.95V to 32V. Operation above 32V is not recommended for continuous use, as it exceeds the guaranteed functional range and may trigger overvoltage lockout (OVLO) at 32V (rising) with 3V hysteresis.
How does the LT3652IDD#TRPBF implement maximum power point tracking (MPPT)?
The LT3652IDD#TRPBF implements hardware-based MPPT via its VIN_REG pin and internal input regulation loop. By connecting a resistor divider from VIN to VIN_REG, the user sets a target input voltage. The IC then dynamically reduces charge current to maintain VIN_REG ≥ 2.7V, keeping the solar panel operating near its VMPPT. This analog control loop achieves >98% peak power tracking without software or external controllers.
Can the LT3652IDD#TRPBF charge a 3-cell LiFePO₄ battery (10.8V nominal)?
Yes, the LT3652IDD#TRPBF can charge a 3-cell LiFePO₄ battery. Its resistor-programmable float voltage supports up to 14.4V, well above the typical 11.4V–12.0V full-charge voltage for 3S LiFePO₄. Using the standard VFB divider equations with R1 = 867kΩ and R2 = 250kΩ sets VFLT = 11.4V, and the 0.5% reference accuracy ensures cell-level compliance within ±57mV.
What happens if the NTC thermistor is disconnected from the LT3652IDD#TRPBF?
If the NTC thermistor is left unconnected, the LT3652IDD#TRPBF disables the temperature monitoring function. The NTC pin remains inactive because its enable threshold requires thermistor resistance <250kΩ to ground. Charging proceeds normally with no thermal supervision - a deliberate design choice allowing optional use of the feature without requiring pull-up/down resistors or firmware changes.
Does the LT3652IDD#TRPBF require an external blocking diode on the input?
No, the LT3652IDD#TRPBF does not require an external input blocking diode. Its architecture prevents reverse current flow from battery to input when VIN is absent - reverse current is specified at only 1µA (max) under worst-case conditions (VIN = 0V, VBAT = VSENSE = VSW = 4.2V). This eliminates diode losses and simplifies solar panel integration.
LT3652IDD#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:
- Multi-Chemistry
- Number of Cells:
- -
- Current - Charging:
- Constant - Programmable
- Programmable Features:
- Current, Timer
- Fault Protection:
- -
- Charge Current - Max:
- 2A
- Battery Pack Voltage:
- 14.4V
- Voltage - Supply (Max):
- 32V
- Interface:
- -
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-DFN (3x3)
LT3652IDD#TRPBF FAQ
1.How can I place an order for LT3652IDD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3652IDD#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 LT3652IDD#TRPBF reliable?
The price and inventory of LT3652IDD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3652IDD#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3652IDD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3652IDD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3652IDD#TRPBF?
LT3652IDD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3652IDD#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 LT3652IDD#TRPBF?
For technical support, including LT3652IDD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3652IDD#TRPBF requirements.
6.How does Aetrix verify that LT3652IDD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3652IDD#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 LT3652IDD#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3652IDD#TRPBF?
All LT3652IDD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3652IDD#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 LT3652IDD#TRPBF part is unused and in its original packaging.
Return procedure for LT3652IDD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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