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Analog Devices Inc. LT3652HVIMSE#PBF
- Part No.:
- LT3652HVIMSE#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Battery Chargers
- Package:
- 12-TSSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT3652HVIMSE#PBF.pdf
- Description:
- IC BAT CHG MULTCHEM 4-5CL 12MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:232
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Product details
Overview
LT3652HVIMSE#PBF from Analog Devices (formerly Linear Technology) is a monolithic 2A step-down battery charger IC with input voltage regulation loop, 4.95V–34V input range, 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 is used in solar-powered remote monitoring stations.
For engineers reviewing the LT3652HVIMSE#PBF datasheet, LT3652HVIMSE#PBF pinout, LT3652HVIMSE#PBF application, or LT3652HVIMSE#PBF equivalent, key selection criteria include input MPPT capability, 12-lead MSOP thermal performance, ±0.5% float voltage accuracy, and programmable 3-hour safety timer for automotive and off-grid battery systems.
Technical Context
The LT3652HVIMSE#PBF implements average-current-mode control with a fixed 1MHz switching frequency and integrated 2A NPN switch driven by a bootstrapped BOOST rail. Its VIN_REG loop actively regulates charge current to maintain input voltage at ≥2.7V-critical for solar panel peak power tracking.
It features dual termination modes: C/10 detection (±2.5% accuracy) and a programmable timer (±10% accuracy, typical 3 hr), plus preconditioning for deeply discharged batteries (70% VFLT threshold) and auto-recharge at 2.5% VFLT drop. Thermal foldback reduces max charge current above 125°C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.95V to 34V (40V absolute max); enables direct charging from unregulated 24VDC adapters or solar panels without pre-regulation. |
| Max Charge Current | Up to 2A (programmable via RSENSE = 0.05Ω); supports fast charging of 5-cell LiFePO₄ (18V) or 4-cell Li-ion packs. |
| Float Voltage Accuracy | ±0.5% (3.282V–3.318V at 25°C); ensures precise cell balancing and longevity for multi-cell lithium batteries. |
| Charge Termination | C/10 detection (±2.5%) or programmable timer (±10%, 3 hr typical); prevents overcharge while enabling top-off for high-impedance batteries. |
| Switch On-Resistance | 0.175Ω (typical); minimizes conduction loss and thermal rise in 12-lead MSOP package with exposed GND pad. |
| Standby Current | 85µA (post-termination); extends system runtime during battery maintenance without external enable control. |
| Operating Frequency | 1MHz fixed; allows compact 20µH inductor and low-profile 10µF output capacitor in space-constrained designs. |
Pinout & Package
LT3652HVIMSE#PBF is housed in a thermally enhanced 12-lead plastic MSOP package with exposed GND pad (Pin 13) requiring PCB soldering for thermal management and electrical grounding. θJA = 43°C/W, θJC = 3°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (1) | Input supply rail | Accepts 4.95V–34V; requires blocking diode and ≥10µF low-ESR input capacitor to handle 2A ripple current. |
| VIN_REG (2) | MPPT regulation reference | Programmed via resistor divider to set minimum input voltage; servo loop reduces charge current if input drops below 2.7V threshold. |
| SHDN (3) | Precision enable/disable | 1.2V rising threshold with 120mV hysteresis; pulls IC into 15µA shutdown when <0.4V applied. |
| CHRG (4) | Open-collector status | Sinks ≤10mA when charging active or fault occurs; high-Z after C/10 termination or timer expiry. |
| FAULT (5) | Open-collector fault indicator | Sinks ≤10mA on temperature fault or bad-battery condition; remains high-Z during normal CV mode. |
| TIMER (6) | Charge cycle timer input | Capacitor-to-ground sets full-cycle timeout (e.g., 0.68µF = 3 hr); grounded to disable timer and use C/10 only. |
| VFB (7) | Float voltage feedback | 3.3V internal reference; resistor divider from BAT to GND programs VFLT up to 18V with 250kΩ equivalent resistance. |
| NTC (8) | Battery temperature monitor | Sources 50µA for 10kΩ B=3380 thermistor; disables charging if voltage <0.29V (>40°C) or >1.36V (<0°C). |
| BAT (9) | Battery output connection | Reference for current sense and float voltage regulation; bias current <0.1µA post-termination to minimize self-discharge. |
| SENSE (10) | Current sense input | 100mV across RSENSE sets ICHG(MAX); RSENSE = 0.1Ω/ICHG(MAX) (e.g., 0.05Ω for 2A). |
| BOOST (11) | Switch gate drive supply | Connected to SW via ≥1µF capacitor; enables saturation of internal NPN switch for <350mV VSW(ON). |
| SW (12) | Switch emitter output | Drives external inductor; maximum 3A peak current limit; requires Schottky catch diode (e.g., MBRS340). |
| 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 adjusting charge current to hold VIN_REG ≥2.7V. |
| Binary-coded status outputs | CHRG and FAULT pins provide unambiguous real-time indication of charging state, thermal fault, or bad-battery condition. |
| Auto-recharge threshold | Triggers new charge cycle when battery voltage falls 2.5% below programmed float voltage-no external comparator needed. |
| Preconditioning mode | Reduces charge current to 15% of max until battery reaches 70% of VFLT, protecting cells below 2.5V/cell. |
| Thermal foldback protection | Automatically lowers max charge current as junction temperature approaches 125°C, preventing thermal runaway. |
Applications
| Solar-Powered Remote Monitoring | 12V–24V Automotive Battery Charging |
|---|---|
|
Use Scenario: Off-grid environmental sensor node powered by 24V solar panel with 5-cell LiFePO₄ backup battery. IC Role / Device Role / Timing Role: Primary battery charger with MPPT input regulation, 18V float voltage, and 3-hour safety timer. Use Value: Maintains panel at VMP under varying irradiance, delivers 1.5A charge current, and prevents overcharge with C/10 + timer dual termination. |
Use Scenario: Auxiliary battery charger in commercial vehicle with unregulated 24V alternator output and lead-acid starter battery. IC Role / Device Role / Timing Role: Constant-current/constant-voltage charger with 14.4V float programming and input droop protection. Use Value: Prevents alternator voltage collapse during high-current charging via VIN_REG loop; enters 85µA standby when engine off. |
| Portable Handheld Instrument Power | Industrial Backup Power System |
|
Use Scenario: Ruggedized handheld multimeter with hot-swappable 4-cell Li-ion pack and USB-C input adapter. IC Role / Device Role / Timing Role: Dual-input charger supporting both 5V USB and 12V wall adapter, with NTC temperature monitoring. Use Value: Enables safe 2A charging from 12V adapter while rejecting USB 5V input via VIN UVLO; halts charge if thermistor detects >40°C. |
Use Scenario: PLC backup power module using 24V DC input and sealed lead-acid battery for brownout ride-through. IC Role / Device Role / Timing Role: Maintenance charger with 27.6V float voltage, auto-recharge, and 85µA standby current. Use Value: Extends battery life via precision 0.5% float accuracy and eliminates manual recharging with 2.5% auto-restart threshold. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar battery charger applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3652EMSE#PBF | Same architecture but rated for –40°C to 85°C (vs. –40°C to 125°C); lower thermal robustness and no guaranteed 125°C operation. | Not suitable for under-hood automotive or high-ambient industrial environments where junction temperature exceeds 85°C. | Select LT3652HVIMSE#PBF when operating ambient exceeds 85°C or when full 125°C junction rating is required for reliability. |
| BQ24616RTWR | TI buck charger with 4.5V–28V input, 2A max, but lacks VIN_REG MPPT loop and uses 1.215V reference (lower float accuracy). | Requires external circuitry for solar MPPT; float voltage accuracy ±1% limits LiFePO₄ cell balancing precision. | Choose LT3652HVIMSE#PBF when integrated MPPT and ±0.5% float accuracy are mandatory for solar or high-precision chemistries. |
Compared with LT3652EMSE#PBF, LT3652HVIMSE#PBF guarantees operation to 125°C junction temperature and includes enhanced input regulation for solar MPPT; versus BQ24616RTWR, it delivers superior float voltage accuracy and eliminates need for external MPPT controllers in off-grid systems.
Availability
LT3652HVIMSE#PBF is available at Aetrix Electronics and suitable for solar-powered remote monitoring, 12V–24V automotive battery charging, portable handheld instrument power, and industrial backup power systems requiring stable component supply across extended temperature ranges.
Supply support for LT3652HVIMSE#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 aerospace markets.
The LT3652HV product line delivers monolithic, high-input-voltage battery chargers optimized for solar MPPT, automotive, and industrial applications where wide VIN range, precision float control, and thermal resilience are critical.
FAQ
What is the maximum battery float voltage supported by the LT3652HVIMSE#PBF?
The LT3652HVIMSE#PBF supports a programmable battery float voltage up to 18V using an external resistor divider on the VFB pin. This accommodates 4-cell Li-ion/polymer (16.8V), 5-cell LiFePO₄ (18V), and 12V lead-acid (14.4V) chemistries. The internal 3.3V reference ensures ±0.5% accuracy across temperature, making LT3652HVIMSE#PBF suitable for precision multi-cell battery management.
How does the LT3652HVIMSE#PBF implement maximum power point tracking (MPPT) for solar panels?
The LT3652HVIMSE#PBF implements MPPT via its VIN_REG input regulation loop: a resistor divider sets a target input voltage (e.g., panel VMP), and the IC dynamically reduces charge current to prevent VIN from falling below that threshold. This servo action maintains the solar panel at peak output power without external microcontrollers or dedicated MPPT ICs-directly enabled by LT3652HVIMSE#PBF's analog regulation architecture.
Can the LT3652HVIMSE#PBF charge batteries at temperatures outside 0°C to 40°C?
No-the LT3652HVIMSE#PBF 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 prevents unsafe charging conditions. If ambient operation beyond this range is required, external thermistor biasing or discrete temperature supervision must be added-LT3652HVIMSE#PBF itself enforces strict 0°C–40°C charging limits.
What is the purpose of the TIMER pin on the LT3652HVIMSE#PBF, and how is it configured?
The TIMER pin on LT3652HVIMSE#PBF accepts a capacitor to ground to set the full-charge cycle timeout (tEOC = CTIMER × 4.4×10⁶ seconds). A 0.68µF capacitor yields ~3 hours. When enabled, the timer allows top-off charging beyond C/10 and triggers bad-battery detection if preconditioning lasts >1/8 of tEOC. Grounding the pin disables the timer, reverting to C/10-only termination-making LT3652HVIMSE#PBF flexible for diverse battery types.
Does the LT3652HVIMSE#PBF require external components for basic operation, and what are the minimum requirements?
Yes-LT3652HVIMSE#PBF requires external components for core functionality: a 1µF BOOST capacitor (VIN to SW), 10µF BAT decoupling capacitor, inductor (e.g., 20µH), Schottky catch diode (e.g., MBRS340), RSENSE for current setting, and a VFB resistor divider for float voltage. Minimum configuration excludes NTC, TIMER, and VIN_REG dividers-but omitting VIN_REG forfeits MPPT, and omitting NTC removes thermal protection. All essential power-path components are mandatory for LT3652HVIMSE#PBF operation.
LT3652HVIMSE#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 12-TSSOP (0.118", 3.00mm Width) 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-MSOP-EP
LT3652HVIMSE#PBF FAQ
1.How can I place an order for LT3652HVIMSE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3652HVIMSE#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 LT3652HVIMSE#PBF reliable?
The price and inventory of LT3652HVIMSE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3652HVIMSE#PBF is usually 5 days.
3.What payment methods are accepted for LT3652HVIMSE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3652HVIMSE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3652HVIMSE#PBF?
LT3652HVIMSE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3652HVIMSE#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 LT3652HVIMSE#PBF?
For technical support, including LT3652HVIMSE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3652HVIMSE#PBF requirements.
6.How does Aetrix verify that LT3652HVIMSE#PBF is sourced from the original manufacturer or authorized distributors?
All LT3652HVIMSE#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 LT3652HVIMSE#PBF meets industry standards.
7.What is the process for return or replacement of LT3652HVIMSE#PBF?
All LT3652HVIMSE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3652HVIMSE#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 LT3652HVIMSE#PBF part is unused and in its original packaging.
Return procedure for LT3652HVIMSE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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