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Analog Devices Inc. LT3652HVIDD#PBF
- Part No.:
- LT3652HVIDD#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Battery Chargers
- Package:
- 12-WFDFN Exposed Pad
- Datasheet:
-
LT3652HVIDD#PBF.pdf
- Description:
- IC BAT CHG MULT-CHEM 4-5CL 12DFN
- Quantity:
- Payment:
- Shipping:
Inventory:225
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Product details
Overview
LT3652HVIDD#PBF 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 operates from 4.95V to 34V input, supports up to 18V battery float voltage, and delivers ±5% charge current accuracy for LiFePO₄, Li-ion, and lead-acid chemistries in solar-powered remote monitoring stations.
For engineers reviewing the LT3652HVIDD#PBF datasheet, LT3652HVIDD#PBF pinout, LT3652HVIDD#PBF application, or LT3652HVIDD#PBF equivalent, key selection criteria include its 12-lead DFN (3mm × 3mm) package with exposed GND pad, 1MHz fixed-frequency operation, 0.5% VFB reference accuracy, thermal foldback protection, and binary-coded open-collector status outputs (CHRG/FAULT).
Technical Context
The LT3652HVIDD#PBF implements average-current mode control with a 1MHz fixed-frequency buck converter architecture, integrating a 2.5A switch with 0.175Ω on-resistance and bootstrapped gate drive via BOOST pin. Its dual-loop regulation combines constant-current/constant-voltage (CC/CV) charging with an independent VIN_REG feedback loop that dynamically reduces charge current to maintain input voltage above a resistor-programmed threshold-critical for MPPT in solar applications.
It features preconditioning for deeply discharged batteries (activates at VFB < 2.3V), auto-recharge triggered by 2.5% float voltage drop, and dual termination modes: C/10 detection (±2.5% accuracy) or programmable safety timer (3-hour default). Temperature monitoring via NTC pin disables charging outside 0°C–40°C, and internal thermal foldback reduces maximum charge current as junction temperature approaches 125°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.95V to 34V - supports unregulated 24VDC adapters and solar panels up to 34V open-circuit voltage. |
| Max Charge Current | 2A - set by external sense resistor (RSENSE = 0.1Ω for 2A); limited to 2.5A switch current rating. |
| Float Voltage Reference | 3.3V ±0.5% - enables precise programming of battery float voltage up to 18V using resistor divider. |
| Charge Termination | C/10 detection (±2.5%) or 3-hour safety timer - ensures full top-off while preventing overcharge in variable-input systems. |
| Switching Frequency | 1MHz fixed - allows compact external magnetics and filtering; reduces EMI compared to lower-frequency chargers. |
| Standby Current | 85µA - minimizes battery self-discharge during maintenance mode after charge completion. |
| Operating Temp Range | –40°C to +125°C - qualified for automotive under-hood and industrial outdoor deployments. |
Pinout & Package
LT3652HVIDD#PBF uses a thermally enhanced 12-lead plastic DFN package (3mm × 3mm) with exposed GND pad (Pin 13) requiring PCB soldering for thermal and electrical integrity. θJA = 43°C/W, θJC = 3°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (1) | Input supply rail | Accepts 4.95V–34V; requires reverse-blocking diode and ≥10µF low-ESR decoupling; start-up requires VIN ≥ VBAT(FLT) + 3.3V. |
| VIN_REG (2) | Input regulation reference | Programs minimum operational input voltage (2.7V threshold); enables MPPT by servoing charge current to hold panel at peak power point. |
| SHDN (3) | Precision enable/disable | 1.2V rising threshold with 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 present; high-impedance during standby; indicates C/10 completion. |
| FAULT (5) | Open-collector fault indicator | Sinks ≤10mA during NTC out-of-range, bad battery, or thermal fault; remains high-Z if no fault detected. |
| TIMER (6) | Charge cycle timer input | Connects to ground for C/10-only termination; 0.68µF capacitor sets 3-hour full-cycle timeout and 22.5-min precondition limit. |
| VFB (7) | Float voltage feedback | 3.3V reference node; battery float voltage programmed via resistor divider; auto-recharge triggers at 2.5% below VFB(FLT). |
| NTC (8) | Temperature monitor input | Sources 50µA for 10kΩ B=3380 thermistor; disables charging if voltage <0.29V (T>40°C) or >1.36V (T<0°C). |
| BAT (9) | Battery output monitor | Reference for current sense (SENSE–BAT); connects to battery terminal; bias current drops to <0.1µA post-termination. |
| SENSE (10) | Current sense input | Measures voltage across RSENSE (BAT–SENSE); 100mV corresponds to full-scale charge current (e.g., 0.05Ω = 2A). |
| BOOST (11) | Bootstrap supply rail | Drives high-side switch; requires ≥1µF capacitor to SW; operates 0–8.5V above SW; enables low RDS(on) switching. |
| SW (12) | Switch node output | Emitter of integrated NPN switch; connects to inductor; voltage swing limited to VIN–0.35V due to internal saturation. |
| GND (13) | Ground and thermal pad | Exposed pad must be soldered to PCB ground plane for thermal dissipation and noise immunity; primary return path. |
Key Features
| Feature | Design Value |
|---|---|
| Input voltage regulation loop | Enables MPPT in solar applications by dynamically reducing charge current to maintain VIN_REG ≥2.7V, maximizing energy harvest without external controllers. |
| Resistor-programmable float voltage | Supports 4-cell Li-ion (16.8V), 5-cell LiFePO₄ (18V), and lead-acid (14.4V) via two-resistor divider; 250kΩ equivalent resistance compensates for VFB bias current error. |
| Preconditioning mode | Activates automatically when VFB <2.3V; limits charge current to 15% of programmed max until battery reaches 70% of float voltage, preventing damage to deeply discharged cells. |
| Binary-coded status outputs | CHRG and FAULT pins provide real-time state visibility (charging, standby, NTC fault, bad battery) without I²C/SPI overhead-ideal for microcontroller GPIO monitoring. |
| Thermal foldback protection | Reduces maximum charge current as junction temperature rises toward 125°C, maintaining safe operation in enclosed or high-ambient environments without external thermal sensors. |
Applications
| Solar-Powered Remote Monitoring | 12V–24V Automotive Battery Charging |
|---|---|
|
Use Scenario: Off-grid environmental sensor node powered by 24V solar panel with unregulated output and variable irradiance. IC Role / Device Role / Timing Role: Primary battery charger managing CC/CV profile, MPPT via VIN_REG loop, and auto-recharge for long-term deployment. Use Value: Eliminates need for external MPPT controller; maintains >90% solar energy capture across irradiance changes while supporting 5-cell LiFePO₄ (18V) battery packs. |
Use Scenario: Auxiliary battery charger in commercial vehicle telematics unit powered from 24V truck electrical system with load-dump transients. IC Role / Device Role / Timing Role: Robust step-down charger with input overvoltage protection (40V abs max), thermal foldback, and C/10 termination for sealed lead-acid backup battery. Use Value: Survives ISO 7637-2 pulses; delivers stable 2A charge current despite engine cranking dips; reduces BOM count by integrating switch, control, and safety logic. |
| Portable Handheld Instruments | Battery Charging from Current-Limited Adapters |
|
Use Scenario: High-precision field multimeter with removable Li-ion pack, charged via USB-C PD adapter negotiating 15V/3A. IC Role / Device Role / Timing Role: Input-flexible charger accepting 15V input, regulating to 8.4V (2S Li-ion), and terminating at C/10 with auto-recharge. Use Value: Enables fast 2A charging from wide-input adapters; NTC monitoring prevents overheating during rapid charge; 85µA standby preserves battery during storage. |
Use Scenario: Industrial handheld scanner using inexpensive 24V/1A unregulated wall adapter to charge 18V LiFePO₄ pack. IC Role / Device Role / Timing Role: Input regulation loop prevents adapter voltage droop below 24V by scaling charge current, avoiding brownouts during peak demand. Use Value: Allows use of low-cost unregulated supplies; eliminates need for oversized adapter; maintains stable 1.5A charge rate even as adapter output sags under load. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar battery charger IC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3652EMSE#PBF | Same die, MSOP-12 package (5.0mm × 4.0mm); higher θJA (50°C/W); no exposed thermal pad. | Limited to lower-power or better-ventilated designs; unsuitable for sustained 2A operation in compact enclosures. | Select LT3652HVIDD#PBF for space-constrained, thermally demanding applications requiring DFN thermal performance. |
| BQ24616RTWR | TI part; 3.5A max; 4.5–28V input; no VIN_REG loop; fixed 1.25V VREF; requires external MOSFETs. | Needs external high-side switch and current sense amplifier; lacks integrated MPPT capability and auto-recharge. | Choose LT3652HVIDD#PBF when MPPT, compactness, and integrated switch are required; BQ24616RTWR suits higher-current, non-solar designs with external FET flexibility. |
Compared with LT3652EMSE#PBF, LT3652HVIDD#PBF offers superior thermal management in dense layouts; versus BQ24616RTWR, it provides monolithic integration and native solar MPPT-reducing component count and enabling autonomous peak-power tracking without MCU intervention.
Availability
LT3652HVIDD#PBF is available at Aetrix Electronics and suitable for solar-powered remote monitoring stations, 12V–24V automotive systems, portable handheld instruments, and battery charging from current-limited adapters requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT3652HVIDD#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 semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LT3652HV product line delivers robust, integrated battery charging solutions for high-input-voltage applications-including solar, automotive, and industrial backup systems-designed to minimize external components while ensuring safety, efficiency, and reliability across harsh operating conditions.
FAQ
What is the maximum battery float voltage supported by the LT3652HVIDD#PBF?
The LT3652HVIDD#PBF supports battery float voltages up to 18V, programmed via a resistor divider on the VFB pin using the internal 3.3V reference. This accommodates 5-cell LiFePO₄ (18V), 4-cell Li-ion (16.8V), and 12V lead-acid (14.4V) chemistries. The 0.5% reference accuracy ensures tight regulation across temperature and line variations.
How does the LT3652HVIDD#PBF implement maximum power point tracking (MPPT) for solar panels?
The LT3652HVIDD#PBF implements MPPT using its VIN_REG input regulation loop: a resistor divider from VIN to VIN_REG sets a target input voltage (e.g., 24V for a 24V-panel's peak power point), and the IC dynamically reduces charge current to maintain VIN_REG ≥2.7V. This servo action holds the panel at its maximum power voltage without requiring external microcontrollers or complex algorithms.
Can the LT3652HVIDD#PBF charge a battery while powering a system load simultaneously?
Yes, the LT3652HVIDD#PBF supports pass-through operation where the BAT pin supplies both the battery and a parallel system load. During charging, current splits between battery replenishment and load demand. The IC regulates battery voltage to the programmed float level regardless of load current, provided total output current (battery + load) stays within the 2A limit and thermal constraints.
What happens if the NTC thermistor is disconnected from the LT3652HVIDD#PBF?
If the NTC pin is left unconnected, the LT3652HVIDD#PBF disables temperature monitoring-the NTC function remains inactive and charging proceeds normally. The datasheet specifies that the NTC circuit only activates when thermistor resistance to ground is <250kΩ; open-circuit or high-resistance conditions are treated as "no monitoring required," with no fault assertion or operational impact.
Does the LT3652HVIDD#PBF require external compensation components for stability?
No, the LT3652HVIDD#PBF uses internal compensation for its average-current mode control loop. External components required are limited to the inductor, input/output capacitors, sense resistor, VFB divider, BOOST capacitor, and optional TIMER capacitor-no external compensation network (e.g., RC across error amp) is needed, simplifying layout and reducing design risk.
LT3652HVIDD#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 12-WFDFN Exposed Pad
- Packaging:
- Tube
- 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)
LT3652HVIDD#PBF FAQ
1.How can I place an order for LT3652HVIDD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3652HVIDD#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 LT3652HVIDD#PBF reliable?
The price and inventory of LT3652HVIDD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3652HVIDD#PBF is usually 5 days.
3.What payment methods are accepted for LT3652HVIDD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3652HVIDD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3652HVIDD#PBF?
LT3652HVIDD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3652HVIDD#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 LT3652HVIDD#PBF?
For technical support, including LT3652HVIDD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3652HVIDD#PBF requirements.
6.How does Aetrix verify that LT3652HVIDD#PBF is sourced from the original manufacturer or authorized distributors?
All LT3652HVIDD#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 LT3652HVIDD#PBF meets industry standards.
7.What is the process for return or replacement of LT3652HVIDD#PBF?
All LT3652HVIDD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3652HVIDD#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 LT3652HVIDD#PBF part is unused and in its original packaging.
Return procedure for LT3652HVIDD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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