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Analog Devices Inc. LT3652HVEDD#TRPBF
- Part No.:
- LT3652HVEDD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Battery Chargers
- Package:
- 12-WFDFN Exposed Pad
- Datasheet:
-
LT3652HVEDD#TRPBF.pdf
- Description:
- IC BAT CHG MULT-CHEM 4-5CL 12DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,609
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Product details
Overview
LT3652HVEDD#TRPBF from Analog Devices (formerly Linear Technology) is a monolithic 2A step-down battery charger IC with input voltage regulation loop, programmable 3.3V float reference, and C/10 or timer-based charge termination. It supports Li-ion/polymer, LiFePO₄, and lead-acid chemistries up to 18V float voltage and operates from 4.95V to 34V input, targeting solar MPPT and remote industrial power systems.
For engineers reviewing the LT3652HVEDD#TRPBF datasheet, LT3652HVEDD#TRPBF pinout, LT3652HVEDD#TRPBF application, or LT3652HVEDD#TRPBF equivalent, key selection considerations include its 1MHz fixed-frequency buck architecture, 0.5% VFB reference accuracy, 5% charge current accuracy, thermal foldback protection, and binary-coded open-collector status outputs for system monitoring.
Technical Context
The LT3652HVEDD#TRPBF implements average-current-mode control with a 1MHz fixed-frequency PWM switch and integrated 2A N-channel MOSFET driver. Its VIN_REG loop actively regulates input voltage by servoing charge current to maintain a user-programmed threshold-critical for solar panel peak power tracking.
It features dual-termination logic: C/10 detection (±2.5% accuracy) or programmable safety timer (±10% accuracy, typical 3-hour full-cycle timeout), plus precondition mode activation below 2.3V on VFB and auto-recharge at 2.5% float voltage drop. The IC integrates NTC thermistor bias (50µA), precision shutdown (1.2V threshold, 120mV hysteresis), and thermal foldback onset near 125°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.95V to 34V (40V absolute max); enables direct charging from unregulated 24V/36V industrial or solar sources without pre-regulation. |
| Max Charge Current | Up to 2A (programmable via sense resistor); supports fast charging of 4-cell LiFePO₄ (18V) or 5-cell configurations. |
| Float Voltage Accuracy | ±0.5% (3.3V reference); ensures stable 18V battery float with <±90mV error across temperature and line. |
| Charge Current Accuracy | ±5%; guarantees precise C-rate delivery for battery longevity and safety compliance in critical applications. |
| C/10 Detection Accuracy | ±2.5%; enables reliable end-of-charge detection without external comparators or microcontroller intervention. |
| Operating Frequency | 1MHz fixed; allows compact 20µH inductor and low-profile 10µF output capacitor in space-constrained designs. |
| Standby Current | 85µA; minimizes parasitic drain during battery maintenance, extending shelf life in remote deployments. |
Pinout & Package
LT3652HVEDD#TRPBF is housed in a thermally enhanced 12-lead 3mm × 3mm plastic DFN package with exposed pad (Pin 13 = GND), rated for –40°C to 125°C junction temperature. θJA = 43°C/W; requires soldered exposed pad for thermal performance and EMI reduction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (1) | Input supply rail | Accepts 4.95–34V; must be ≥3.3V above programmed float voltage for startup; connects to cathode of blocking diode. |
| VIN_REG (2) | Input regulation reference | Sets minimum operational input voltage; IC reduces charge current to hold this pin ≥2.7V-enables MPPT in solar applications. |
| SHDN (3) | Precision enable/disable | 1.2V rising threshold with 120mV hysteresis; pulls VIN current to 15µA in shutdown; supports UVLO implementation. |
| CHRG (4) | Open-collector status | Pulled low during active charging (>C/10) or thermal fault; high-Z when terminated or in standby; sinks ≤10mA. |
| FAULT (5) | Open-collector fault indicator | Pulled low for NTC out-of-range, bad battery, or timer fault; remains high-Z otherwise; sinks ≤10mA. |
| TIMER (6) | Capacitor-programmed timer | Connects to ground for C/10-only termination; 0.68µF sets 3-hour full-cycle timeout and 22.5-min precondition limit. |
| VFB (7) | Float voltage feedback | 3.3V internal reference; battery voltage scaled via resistor divider; auto-recharge triggers at 2.5% drop from float. |
| NTC (8) | Thermistor monitor input | Sources 50µA; monitors 10kΩ B=3380 NTC; disables charging if voltage <0.29V (>40°C) or >1.36V (<0°C). |
| BAT (9) | Battery output node | Reference for SENSE pin; connects to battery anode; bias current drops to <0.1µA post-termination to prevent discharge. |
| SENSE (10) | Current sense input | Measures voltage across RSENSE; 100mV = full-scale (2A); bias current <0.1µA post-termination. |
| BOOST (11) | Bootstrap supply | Drives high-side switch; requires ≥1µF cap to SW; enables saturation for low RDS(on) and high efficiency. |
| SW (12) | Switch node | Output of internal 2A switch; connects to inductor; effective on-resistance = 0.175Ω at full load. |
| GND (13) | Power and thermal ground | Exposed pad must be soldered to PCB ground plane for thermal management and noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Input voltage regulation loop | Enables true MPPT in solar-powered systems by dynamically adjusting charge current to hold VIN_REG ≥2.7V. |
| Programmable float voltage up to 18V | Supports 4-cell Li-ion (16.8V), 5-cell LiFePO₄ (18V), and 12V/24V lead-acid with single-resistor-divider configuration. |
| Binary-coded status outputs | CHRG and FAULT pins provide real-time state machine visibility (charging, standby, thermal fault, bad battery) without I²C/SPI overhead. |
| Precondition mode with 15% current limit | Automatically engages below 2.3V on VFB to safely recover deeply discharged batteries before full-rate charging. |
| Thermal foldback protection | Reduces maximum charge current as junction temperature approaches 125°C-prevents thermal runaway without external sensors. |
Applications
| Solar-Powered Remote Monitoring | 12V–24V Automotive Auxiliary Charging |
|---|---|
Use Scenario: Off-grid environmental sensor station powered by 36V solar array with 18V LiFePO₄ battery bank. IC Role / Device Role / Timing Role: Primary buck charger implementing MPPT via VIN_REG loop; regulates charge current to hold panel at VMPPT ≈ 30V while delivering 1.5A to battery. Use Value: Achieves >92% system-level energy harvest efficiency by eliminating need for separate DC-DC MPPT controller and charger IC. | Use Scenario: In-vehicle telematics unit drawing power from 24V truck battery, requiring backup Li-ion pack charged from alternator. IC Role / Device Role / Timing Role: Isolated battery charger interfacing with noisy automotive 24V rail; uses SHDN pin for ignition-synchronized enable and NTC for cabin temperature compensation. Use Value: Prevents overcharge and thermal stress in high-ambient environments (≥85°C) through integrated NTC monitoring and automatic current foldback. |
| Portable Handheld Instrument Power | Industrial Backup Power System |
Use Scenario: Ruggedized handheld multimeter with hot-swappable 4-cell Li-ion pack (16.8V nominal) charged via 24V wall adapter. IC Role / Device Role / Timing Role: Constant-current/constant-voltage charger with C/10 termination and auto-recharge; VFB divider sets 16.8V float; TIMER pin grounded. Use Value: Ensures full capacity recovery and cycle life >500 cycles by maintaining ±0.5% float voltage accuracy and preventing trickle overcharge. | Use Scenario: PLC I/O module with supercapacitor-assisted backup, using LT3652HVEDD#TRPBF to condition 12V lead-acid service battery. IC Role / Device Role / Timing Role: Lead-acid optimized charger with 14.4V float; uses internal timer (3h) for absorption phase and C/10 for float transition. Use Value: Extends battery service life by 40% versus fixed-timer chargers through adaptive termination and voltage-accurate absorption control. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar battery charger applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3652EMSE#TRPBF | Same core functionality but in 12-lead MSOP package; higher θJA (55°C/W vs 43°C/W); no exposed thermal pad. | Preferred for prototyping or low-power (<1.2A) applications where DFN reflow is unavailable; unsuitable for continuous 2A operation at high ambient. | Select only if board layout cannot accommodate DFN thermal pad or if manual assembly is required. |
| BQ24616RTWR | TI part with 3.5A max current, 4–28V input, but lacks VIN_REG loop and MPPT capability; uses external sense resistor for current programming. | Applicable for non-solar 24V adapter-fed systems requiring higher current; no native solar optimization or auto-recharge. | Choose when >2A output or cost-sensitive BOM is prioritized over MPPT and precision float accuracy. |
Compared with LT3652EMSE#TRPBF, the LT3652HVEDD#TRPBF delivers superior thermal performance and higher sustained current in compact layouts; compared with BQ24616RTWR, it provides integrated MPPT, tighter float voltage tolerance (0.5% vs 1%), and lower standby current (85µA vs 120µA), making it optimal for solar and battery-maintenance-critical designs.
Availability
LT3652HVEDD#TRPBF is available at Aetrix Electronics and suitable for solar-powered remote monitoring stations, 12V–24V automotive auxiliary systems, and portable handheld instrument power supplies requiring stable component supply, long-term lifecycle support, and guaranteed parametric performance across –40°C to 125°C.
Supply support for LT3652HVEDD#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, Inc. (ADI) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, formed through the acquisition of Linear Technology in 2017.
The LT3652HV product line was designed specifically for high-input-voltage, multi-chemistry battery charging in harsh environments-emphasizing MPPT capability, wide temperature operation, and minimal external component count for industrial and renewable energy applications.
FAQ
What is the maximum battery float voltage supported by the LT3652HVEDD#TRPBF?
The LT3652HVEDD#TRPBF supports a programmable battery float voltage up to 18V, achieved via a resistor divider on the VFB pin referencing its internal 3.3V precision voltage reference. This enables direct charging of 4-cell Li-ion (16.8V), 5-cell LiFePO₄ (18V), and 12V/24V lead-acid batteries without external op-amps or DACs. The 0.5% reference accuracy ensures float voltage stability within ±90mV over temperature and line variations.
How does the LT3652HVEDD#TRPBF implement maximum power point tracking (MPPT) for solar panels?
The LT3652HVEDD#TRPBF implements hardware-based MPPT using its VIN_REG pin: a resistor divider from the solar panel output to VIN_REG sets a target voltage (e.g., 30V), and the IC dynamically reduces charge current to maintain that voltage-keeping the panel operating at peak power. Unlike microcontroller-based solutions, this analog loop responds in real time to irradiance changes with no firmware overhead or latency, and requires zero additional components beyond the divider resistors.
Can the LT3652HVEDD#TRPBF charge batteries at temperatures outside 0°C to 40°C?
No-the LT3652HVEDD#TRPBF suspends charging if the NTC pin voltage falls below 0.29V (indicating >40°C) or rises above 1.36V (indicating <0°C), per its integrated battery temperature monitoring circuit. This hard safety cutoff prevents lithium-based battery damage or thermal runaway. Charging resumes automatically only when the NTC voltage returns to the 0.29V–1.36V window, corresponding to ~0°C–40°C with ~5°C hysteresis at each threshold.
What is the purpose of the precondition mode in the LT3652HVEDD#TRPBF?
The precondition mode in the LT3652HVEDD#TRPBF activates automatically when the VFB pin voltage is below 2.3V-indicating a deeply discharged battery. During this mode, charge current is limited to 15% of the programmed maximum (e.g., 300mA for a 2A design) to safely raise cell voltage without stress. Once VFB reaches 70% of the final float voltage, the IC transitions to full-rate constant-current charging, protecting battery health and ensuring safe recovery of damaged or aged cells.
Does the LT3652HVEDD#TRPBF require external components for basic operation?
Yes-the LT3652HVEDD#TRPBF requires seven essential external components for basic operation: input capacitor (CVIN), output capacitor (CBAT), power inductor (L), sense resistor (RSENSE), bootstrap capacitor (CBOOST), VFB divider resistors (R1/R2), and optional NTC thermistor. No external MOSFETs, op-amps, or microcontrollers are needed. The IC integrates the 2A switch, 1MHz oscillator, reference, error amplifiers, and status logic-reducing BOM count and PCB area versus discrete charger solutions.
LT3652HVEDD#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:
- 4 ~ 5
- Current - Charging:
- Constant - Programmable
- Programmable Features:
- Current, Timer
- Fault Protection:
- -
- Charge Current - Max:
- 2A
- Battery Pack Voltage:
- 18V (Max)
- Voltage - Supply (Max):
- 34V
- Interface:
- -
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-DFN (3x3)
LT3652HVEDD#TRPBF FAQ
1.How can I place an order for LT3652HVEDD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3652HVEDD#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 LT3652HVEDD#TRPBF reliable?
The price and inventory of LT3652HVEDD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3652HVEDD#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3652HVEDD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3652HVEDD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3652HVEDD#TRPBF?
LT3652HVEDD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3652HVEDD#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 LT3652HVEDD#TRPBF?
For technical support, including LT3652HVEDD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3652HVEDD#TRPBF requirements.
6.How does Aetrix verify that LT3652HVEDD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3652HVEDD#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 LT3652HVEDD#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3652HVEDD#TRPBF?
All LT3652HVEDD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3652HVEDD#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 LT3652HVEDD#TRPBF part is unused and in its original packaging.
Return procedure for LT3652HVEDD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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