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Analog Devices Inc. LT3652HVIMSE#TRPBF
- Part No.:
- LT3652HVIMSE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Battery Chargers
- Package:
- 12-TSSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT3652HVIMSE#TRPBF.pdf
- Description:
- IC BAT CHG MULTCHEM 4-5CL 12MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:7,015
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Product details
Overview
LT3652HVIMSE#TRPBF from Analog Devices (formerly Linear Technology) is a monolithic 1MHz step-down battery charger IC with integrated 2A switch, supporting 4.95V–34V input and programmable 3.3V reference-based float voltage up to 18V. It delivers constant-current/constant-voltage charging with C/10 or timer-based termination, input voltage regulation for MPPT solar tracking, and NTC-based temperature monitoring for Li-ion, LiFePO₄, and lead-acid batteries in remote power systems.
For engineers reviewing the LT3652HVIMSE#TRPBF datasheet, LT3652HVIMSE#TRPBF pinout, LT3652HVIMSE#TRPBF application, or LT3652HVIMSE#TRPBF equivalent, key selection considerations include its 2A programmable charge current, 0.5% float voltage reference accuracy, 5% charge current accuracy, 2.5% C/10 detection accuracy, and thermally enhanced 12-lead MSOP package with exposed GND pad.
Technical Context
The LT3652HVIMSE#TRPBF implements average-current mode control using a 1MHz fixed-frequency buck architecture with bootstrapped gate drive (BOOST pin), enabling high-efficiency operation across wide VIN–VBAT differentials. Its dual-loop regulation combines VFB-referenced CV control and VIN_REG-servoed CC control to maintain peak input power during solar harvesting.
It integrates preconditioning (15% reduced current below 70% VFLT), auto-recharge at 2.5% VFLT drop, thermal foldback above 125°C, and binary-coded open-collector status outputs (CHRG/FAULT) with 10mA sink capability. The internal 3-hour safety timer supports top-off charging beyond C/10 and enables bad-battery detection after 22.5 minutes.
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 via external sense resistor (RSENSE = 0.05Ω), enabling fast charging of 5-cell LiFePO₄ (18V) or 4-cell Li-ion packs. |
| Float Voltage Accuracy | ±0.5% - 3.3V internal reference enables precise programming of battery float voltages up to 18V with resistor divider. |
| C/10 Detection Accuracy | ±2.5% - ensures reliable termination when charge current drops to 1/10 of programmed maximum (e.g., 200mA for 2A setting). |
| Standby Current | 85µA - ultra-low quiescent current maintains long-term battery float without significant self-discharge. |
| Operating Frequency | 1MHz - allows compact external components (e.g., 20µH inductor, 10µF output cap) and reduces EMI in space-constrained designs. |
| Thermal Shutdown | 125°C - junction temperature limit with automatic foldback reduces ICHG before shutdown, protecting battery and IC. |
Pinout & Package
LT3652HVIMSE#TRPBF is housed in a thermally enhanced 12-lead plastic MSOP package (3mm × 4.9mm) 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 low-ESR bulk capacitor to handle switching ripple. |
| VIN_REG (2) | MPPT regulation reference | Programmable threshold (2.7V typ) to servo charge current and maintain solar panel at VMPPT. |
| SHDN (3) | Precision enable/disable | 1.2V rising threshold with 120mV hysteresis; pulls VIN current to 15µA in shutdown. |
| CHRG (4) | Open-collector status | Sinks 10mA when charging active or fault present; high-Z after C/10 or timer termination. |
| FAULT (5) | Open-collector fault indicator | Sinks 10mA on temperature fault or bad-battery condition; high-Z otherwise. |
| TIMER (6) | Charge cycle timer input | Connects to ground (disable) or 0.68µF cap (3-hour timeout); enables top-off and bad-battery detection. |
| VFB (7) | Float voltage feedback | 3.3V reference point; resistor divider from BAT sets VFLT up to 18V with 250kΩ equivalent impedance. |
| NTC (8) | Temperature monitor input | Sources 50µA for 10kΩ B=3380 thermistor; disables charging if T < 0°C or T > 40°C. |
| BAT (9) | Battery output connection | Reference for current sensing and voltage regulation; bias current < 0.1µA in standby to minimize discharge. |
| SENSE (10) | Current sense input | Measures voltage across RSENSE; 100mV corresponds to full-scale 2A charge current. |
| BOOST (11) | Bootstrap supply | Drives high-side switch; requires ≥1µF capacitor to SW for saturation and low RDS(on). |
| SW (12) | Switch node | Connects to inductor; internal 2.5A switch with 0.175Ω effective on-resistance under boost drive. |
| GND (13) | Power and thermal ground | Exposed pad must be soldered to PCB ground plane for thermal dissipation and noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Input voltage regulation loop | Enables true MPPT for solar panels by dynamically reducing charge current to hold VIN_REG at 2.7V, maximizing energy harvest. |
| Programmable float voltage | Supports 4-cell Li-ion (16.8V), 5-cell LiFePO₄ (18V), and 12V/24V lead-acid via resistor divider - no external DAC required. |
| Auto-recharge threshold | Triggers new charge cycle when battery voltage drops 2.5% below VFLT, maintaining optimal state-of-charge in intermittently powered systems. |
| Preconditioning mode | Reduces charge current to 15% of max if battery voltage < 70% VFLT, preventing damage to deeply discharged cells. |
| Binary status outputs | CHRG and FAULT pins provide unambiguous system-level visibility into charging progress, faults, and standby state without ADC overhead. |
Applications
| Solar-Powered Remote Monitoring | 12V–24V Automotive Auxiliary Charging |
|---|---|
Use Scenario: Off-grid environmental sensor station powered by 30V solar panel with 18V LiFePO₄ battery pack. IC Role / Device Role / Timing Role: Primary battery charger implementing MPPT via VIN_REG loop and C/10 termination with auto-recharge. Use Value: Maximizes daily energy harvest while ensuring safe, full charging of 5-cell LiFePO₄ without microcontroller intervention. |
Use Scenario: In-vehicle telematics unit drawing from 12V/24V vehicle bus while maintaining backup Li-ion battery. IC Role / Device Role / Timing Role: Standalone buck charger regulating from variable automotive rail to stable 8.4V (2S Li-ion) float voltage. Use Value: Eliminates need for external LDO or DC-DC pre-regulator; withstands load dump transients up to 40V absolute max rating. |
| Portable Handheld Instrument Power | Battery Charging from Unregulated Adapter |
Use Scenario: Field-deployable multimeter with removable 4-cell Li-ion pack charged via USB-C PD or wall adapter. IC Role / Device Role / Timing Role: Integrated charger managing CC/CV profile, NTC temperature supervision, and status signaling to host MCU. Use Value: Reduces BOM count by integrating switch, controller, and protection - no external MOSFET or discrete sense amp needed. |
Use Scenario: Industrial IoT gateway powered by low-cost 24V/1A unregulated wall adapter charging 18V LiFePO₄ battery. IC Role / Device Role / Timing Role: Input regulation prevents adapter droop below 24V while delivering 1.5A constant current until C/10. Use Value: Enables use of inexpensive, non-current-limited adapters without risking brownout or overloading the supply. |
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 architecture but rated for –40°C to 85°C (vs. –40°C to 125°C for HV grade); lower input voltage max (28V vs. 34V). | Suitable for commercial-temperature indoor applications only; not rated for automotive under-hood or solar outdoor ambient extremes. | Select LT3652HVIMSE#TRPBF for extended temperature range and higher input voltage headroom in harsh environments. |
| BQ24616RGER | TI part with 3.5A max current, 4.5V–28V input, but lacks VIN_REG MPPT loop and uses external N-channel FET instead of integrated switch. | Requires external high-side MOSFET and gate driver; no built-in solar tracking - needs MCU-based MPPT algorithm. | Choose LT3652HVIMSE#TRPBF for monolithic simplicity, integrated MPPT, and smaller solution size in solar or adapter-fed systems. |
Compared with LT3652EMSE#TRPBF, the LT3652HVIMSE#TRPBF provides 6V higher input voltage margin and guaranteed operation to 125°C junction temperature; compared with BQ24616RGER, it eliminates external FET and gate drive complexity while adding autonomous MPPT - reducing component count and firmware dependency.
Availability
LT3652HVIMSE#TRPBF is available at Aetrix Electronics and suitable for solar-powered remote monitoring stations, 12V–24V automotive auxiliary systems, portable handheld instruments, and battery charging from unregulated adapters requiring stable component supply across industrial temperature ranges.
Supply support for LT3652HVIMSE#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 and maintains its high-performance analog IC portfolio, focusing on precision power management, signal conditioning, and timing solutions for demanding industrial and automotive applications.
The LT3652HV series was designed as a monolithic, high-input-voltage battery charger targeting solar, remote, and automotive auxiliary power systems where reliability, minimal external components, and autonomous MPPT are critical design requirements.
FAQ
What is the maximum battery float voltage supported by the LT3652HVIMSE#TRPBF?
The LT3652HVIMSE#TRPBF supports battery float voltages up to 18V, programmed via a resistor divider connected to the VFB pin using the internal 3.3V reference. This accommodates 5-cell LiFePO₄ (18V), 4-cell Li-ion (16.8V), and standard lead-acid chemistries. The 0.5% reference accuracy ensures tight regulation across temperature and line conditions.
How does the LT3652HVIMSE#TRPBF implement MPPT for solar panels?
The LT3652HVIMSE#TRPBF implements MPPT using its VIN_REG pin: a resistor divider from VIN to GND sets a target input voltage (e.g., panel VMPPT), and the IC dynamically reduces charge current to maintain that voltage. This servo action keeps the solar panel operating at peak power point without requiring an external MCU or algorithm.
Can the LT3652HVIMSE#TRPBF charge batteries below 0°C or above 40°C?
No - the LT3652HVIMSE#TRPBF disables charging if the NTC pin voltage falls outside 0.29V–1.36V, corresponding to battery temperatures below 0°C or above 40°C. This hard thermal cutoff protects cell integrity and is enforced regardless of timer or C/10 settings. Charging resumes automatically once temperature returns to the safe range.
What is the purpose of the TIMER pin on the LT3652HVIMSE#TRPBF?
The TIMER pin on the LT3652HVIMSE#TRPBF programs the end-of-charge safety timer: a 0.68µF capacitor yields a 3-hour timeout. When enabled, it allows top-off charging beyond C/10 and triggers bad-battery detection if preconditioning persists past 22.5 minutes (1/8 of full cycle). Grounding the pin disables timer functionality and defaults to C/10 termination.
Does the LT3652HVIMSE#TRPBF require external MOSFETs for operation?
No - the LT3652HVIMSE#TRPBF integrates a 2.5A-rated internal N-channel power switch with bootstrapped gate drive (via BOOST pin), eliminating the need for external MOSFETs, drivers, or associated passive components. This monolithic design reduces solution size, cost, and layout complexity compared to controller-only alternatives.
LT3652HVIMSE#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 12-TSSOP (0.118", 3.00mm Width) 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-MSOP-EP
LT3652HVIMSE#TRPBF FAQ
1.How can I place an order for LT3652HVIMSE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3652HVIMSE#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 LT3652HVIMSE#TRPBF reliable?
The price and inventory of LT3652HVIMSE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3652HVIMSE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3652HVIMSE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3652HVIMSE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3652HVIMSE#TRPBF?
LT3652HVIMSE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3652HVIMSE#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 LT3652HVIMSE#TRPBF?
For technical support, including LT3652HVIMSE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3652HVIMSE#TRPBF requirements.
6.How does Aetrix verify that LT3652HVIMSE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3652HVIMSE#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 LT3652HVIMSE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3652HVIMSE#TRPBF?
All LT3652HVIMSE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3652HVIMSE#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 LT3652HVIMSE#TRPBF part is unused and in its original packaging.
Return procedure for LT3652HVIMSE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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