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Analog Devices Inc. LT3652IDD#PBF
- Part No.:
- LT3652IDD#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Battery Chargers
- Package:
- 12-WFDFN Exposed Pad
- Datasheet:
-
LT3652IDD#PBF.pdf
- Description:
- IC BATT CHG MULTI-CHEM 12DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,037
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Product details
Overview
LT3652IDD#PBF 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 and high-input-voltage battery charging systems. It delivers constant-current/constant-voltage charging with resistor-programmable float voltage up to 14.4V, input voltage regulation for MPPT, and C/10 or timer-based termination - used in remote LiFePO₄ monitoring stations and 12–24V automotive auxiliary power systems.
For engineers reviewing the LT3652IDD#PBF datasheet, LT3652IDD#PBF pinout, LT3652IDD#PBF application, or LT3652IDD#PBF equivalent, key selection considerations include its 4.95–32V input range, 1MHz fixed-frequency operation, ±0.5% float voltage reference accuracy, thermal foldback protection, and compatibility with Li-ion, LiFePO₄, and SLA chemistries without external blocking diodes for ≤4.2V batteries.
Technical Context
The LT3652IDD#PBF implements average-current-mode control with a 1MHz fixed-frequency buck architecture, using an internal 35V NPN switch driven by a bootstrapped BOOST rail. Its dual-loop regulation includes a voltage error amplifier (V-EA) referencing 3.3V at VFB and a current error amplifier (C-EA) servoing to ITH-derived thresholds for precise CC/CV transition.
Input voltage regulation (VIN_REG loop) maintains peak power point tracking by dynamically reducing charge current when VIN_REG falls below 2.7V; precondition mode activates below 2.3V on VFB to limit current to 15% of programmed max until battery reaches 70% of float voltage. Termination is configurable via C/10 detection (10mV sense threshold) or a programmable timer (e.g., 3-hour EOC with 0.68µF capacitor).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.95V to 32V - supports direct connection to unregulated solar panels and 24V industrial rails without pre-regulation. |
| Max Charge Current | 2A - set by external sense resistor (RSENSE = 0.05Ω), enabling full-charge delivery to 2-cell LiFePO₄ (7.2V) or 3-cell SLA (9V) packs. |
| Float Voltage Accuracy | ±0.5% (3.282–3.318V at VFB) - ensures ±0.072V tolerance on 14.4V battery systems, critical for LiFePO₄ longevity. |
| Charge Termination | C/10 detection (±2.5%) or programmable timer (±10%) - allows top-off charging beyond C/10 for improved capacity utilization. |
| Switch On-Resistance | 0.175Ω - minimizes conduction loss at 2A, supporting >88% efficiency at 20VIN/8.2VBAT. |
| Standby Current | 85µA - enables multi-year operation in solar-powered remote sensors without battery drain. |
| Operating Frequency | 1MHz fixed - permits compact 10µH inductor and 10µF output capacitor designs, reducing board area vs. lower-frequency chargers. |
Pinout & Package
LT3652IDD#PBF is housed in a thermally enhanced 12-lead 3mm × 3mm DFN package with exposed GND pad (Pin 13) requiring PCB soldering for thermal and electrical integrity. θJA = 43°C/W enables 2A operation without forced airflow in typical 2-layer layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (1) | Input supply rail | Accepts 4.95–32V; bias source for internal circuitry; requires ≥10µF low-ESR ceramic decoupling. |
| VIN_REG (2) | MPPT regulation reference | Programs input voltage threshold (2.7V typ); connects to resistor divider from solar panel to enable peak power tracking. |
| SHDN (3) | Precision enable/disable | 1.2V rising threshold with 120mV hysteresis; pulls IC into 15µA shutdown when <0.4V. |
| CHRG (4) | Open-collector status | Sinks 10mA when charging active or faulted; high-Z after C/10 or timer EOC; signals "charging in progress". |
| FAULT (5) | Open-collector fault indicator | Sinks 10mA during NTC over/under-temp, bad battery, or thermal shutdown; remains high-Z otherwise. |
| TIMER (6) | Capacitor-programmed timer | Connects to ground for C/10-only termination; 0.68µF sets 3-hour full-charge timeout and 22.5-min precondition limit. |
| VFB (7) | Float voltage feedback | 3.3V reference node; resistor divider from BAT sets float voltage (e.g., 8.2V → R1=621kΩ, R2=250kΩ). |
| NTC (8) | Thermistor interface | Sources 50µA; monitors 10kΩ B=3380 NTC; disables charging if voltage <0.29V (>40°C) or >1.36V (<0°C). |
| BAT (9) | Battery output monitor | Reference for SENSE voltage; connects to battery+; hosts 10µF decoupling; <0.1µA bias post-termination. |
| SENSE (10) | Current sense input | Measures voltage across RSENSE (BAT–SENSE); 100mV = 2A; <0.1µA bias post-termination minimizes leakage. |
| BOOST (11) | Bootstrap supply | Drives switch gate above VIN; requires ≥1µF capacitor to SW; enables low RON (0.175Ω) at 2A. |
| SW (12) | Switch emitter output | Connects to inductor; switches between VIN and GND; voltage swing limited to VIN–0.35V (saturation). |
| GND (13) | Power/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 >98% MPPT efficiency in solar applications by dynamically throttling charge current to hold panel at VMP. |
| Precondition mode | Automatically reduces charge current to 15% of max when battery voltage <2.3V at VFB, preventing damage to deeply discharged cells. |
| Auto-recharge function | Triggers new charge cycle when battery voltage drops 2.5% below float voltage - maintains optimal state-of-charge in intermittently loaded systems. |
| No VIN blocking diode required | Supports battery voltages ≤4.2V without external diode, eliminating 0.3–0.7V drop and associated heat generation. |
| Binary-coded status outputs | CHRG and FAULT pins provide discrete fault isolation (e.g., CHRG low + FAULT low = temperature fault) for microcontroller polling. |
Applications
| Solar-Powered Remote Monitoring | LiFePO₄-Based Portable Instruments |
|---|---|
Use Scenario: Off-grid environmental sensor node powered by 17VOC solar panel, charging 2S LiFePO₄ (7.2V) battery with daily 50mA load. IC Role / Device Role / Timing Role: Primary battery management IC performing MPPT, CC/CV charging, temperature supervision, and auto-recharge. Use Value: Achieves >98% solar energy harvest via VIN_REG loop and extends battery life with precise 3.6V/cell float voltage and 0°C–40°C thermal cutoff. |
Use Scenario: Handheld gas detector with 7.2V LiFePO₄ pack, charged via 12–24V vehicle adapter with intermittent use. IC Role / Device Role / Timing Role: Integrated charger managing full-charge cycles, standby maintenance, and safe restart after battery replacement. Use Value: Eliminates need for external UVLO or thermal ICs; 85µA standby current enables >1-year shelf life; C/10 + timer termination prevents overcharge. |
| 12V/24V Automotive Auxiliary Power | Industrial Backup Power Systems |
Use Scenario: Telematics gateway in commercial fleet vehicle, maintaining supercapacitor-assisted 12V backup battery during engine-off periods. IC Role / Device Role / Timing Role: High-voltage tolerant charger regulating alternator-sourced 13.8–28V input to stable 12.8V SLA float voltage. Use Value: Withstands 40V abs max input; no blocking diode needed for 12V battery; input regulation prevents alternator voltage spikes from disrupting charging. |
Use Scenario: Programmable logic controller (PLC) with non-volatile memory retention, backed by sealed lead-acid battery recharged from 24V DC plant bus. IC Role / Device Role / Timing Role: Reliable, maintenance-free charger providing float voltage regulation, end-of-charge termination, and fault signaling to PLC diagnostics. Use Value: ±0.5% VFB accuracy ensures SLA longevity; binary status pins integrate directly with PLC GPIO; -40°C to 125°C rating suits industrial enclosures. |
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 die, 12-lead MSOP package (5.0mm × 4.0mm); θJA = 43°C/W but larger footprint and lower power density. | Preferred where manual assembly or thermal vias under MSOP are preferred over DFN reflow; less suitable for space-constrained solar modules. | Select for prototyping ease or legacy MSOP-compatible layouts; LT3652IDD#PBF offers superior thermal performance per mm². |
| BQ24610RTWR | TI 2.5A buck charger; 4.5–28V input; fixed 3.3V VREF (non-programmable float); no VIN_REG loop or MPPT capability. | Lacks solar-specific features; suited for fixed-input industrial chargers where MPPT is unnecessary. | Choose only when float voltage is fixed at 3.3V×N and solar input regulation is handled externally; LT3652IDD#PBF provides full programmability and integrated MPPT. |
Compared with LT3652EMSE#PBF, the LT3652IDD#PBF delivers identical functionality in a smaller, thermally superior DFN package ideal for solar edge devices; versus BQ24610RTWR, it adds resistor-programmable float voltage, input regulation for MPPT, and wider 4.95–32V input range - making it uniquely suited for variable-source battery charging.
Availability
LT3652IDD#PBF is available at Aetrix Electronics and suitable for solar-powered remote monitoring, LiFePO₄ portable instrumentation, and 12V/24V automotive auxiliary power systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT3652IDD#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 precision instrumentation, industrial, automotive, and communications markets.
The LT3652IDD#PBF belongs to Linear's Power Management product line, engineered specifically for high-input-voltage, multi-chemistry battery charging in energy-harvesting and off-grid applications - emphasizing MPPT integration, wide temperature operation, and minimal external component count.
FAQ
What is the maximum battery float voltage supported by the LT3652IDD#PBF?
The LT3652IDD#PBF supports resistor-programmable float voltage up to 14.4V via the VFB pin and external divider. Its internal 3.3V reference (±0.5%) and 250kΩ equivalent divider impedance ensure accurate scaling - for example, setting 8.2V float requires R1 = 621kΩ and R2 = 250kΩ. This range accommodates 2S LiFePO₄ (7.2V), 3S SLA (9V), and 4S Li-ion (16.8V) with appropriate derating.
Does the LT3652IDD#PBF require an external blocking diode when charging a 3.7V Li-ion battery?
No, the LT3652IDD#PBF does not require an external blocking diode when charging batteries ≤4.2V. Its internal architecture prevents reverse current flow from battery to input, verified by <1µA reverse leakage (IREVERSE) at VIN = 0V and VBAT = 4.2V. This eliminates diode voltage drop and thermal loss, improving efficiency in low-voltage battery systems.
How is maximum charge current programmed on the LT3652IDD#PBF?
Maximum charge current on the LT3652IDD#PBF is set by the sense resistor RSENSE between SENSE and BAT pins: RSENSE = 0.1Ω / ICHG(MAX). For 2A operation, RSENSE = 0.05Ω (50mΩ). The IC regulates average current to maintain 100mV across RSENSE in CC mode, with ±5% accuracy over temperature and line conditions.
Can the LT3652IDD#PBF perform maximum power point tracking (MPPT) with a solar panel?
Yes, the LT3652IDD#PBF implements hardware-based MPPT via its VIN_REG pin. By connecting a resistor divider from the solar panel output to VIN_REG, the IC dynamically reduces charge current to hold the panel voltage at the programmed threshold (e.g., 17V for a 17VMP panel), achieving >98% peak power tracking efficiency without external controllers or software.
What happens if the battery temperature exceeds 40°C during charging with the LT3652IDD#PBF?
If the NTC pin voltage falls below 0.29V (indicating >40°C battery temperature), the LT3652IDD#PBF immediately suspends charging, pulls both CHRG and FAULT pins low, and pauses the internal timer. Charging resumes automatically only when the NTC voltage returns to the 0.29–1.36V window (0–40°C), ensuring safe operation without microcontroller intervention.
LT3652IDD#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:
- -
- 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#PBF FAQ
1.How can I place an order for LT3652IDD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3652IDD#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 LT3652IDD#PBF reliable?
The price and inventory of LT3652IDD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3652IDD#PBF is usually 5 days.
3.What payment methods are accepted for LT3652IDD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3652IDD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3652IDD#PBF?
LT3652IDD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3652IDD#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 LT3652IDD#PBF?
For technical support, including LT3652IDD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3652IDD#PBF requirements.
6.How does Aetrix verify that LT3652IDD#PBF is sourced from the original manufacturer or authorized distributors?
All LT3652IDD#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 LT3652IDD#PBF meets industry standards.
7.What is the process for return or replacement of LT3652IDD#PBF?
All LT3652IDD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3652IDD#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 LT3652IDD#PBF part is unused and in its original packaging.
Return procedure for LT3652IDD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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