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Analog Devices Inc. LT3652EDD#PBF
- Part No.:
- LT3652EDD#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Battery Chargers
- Package:
- 12-WFDFN Exposed Pad
- Datasheet:
-
LT3652EDD#PBF.pdf
- Description:
- IC BATT CHG MULTI-CHEM 12DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,753
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Product details
Overview
LT3652EDD#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 LiFePO₄, Li-ion, and SLA battery systems. It delivers constant-current/constant-voltage charging across 4.95V–32V input, supports MPPT via VIN_REG loop, features 0.5% float voltage accuracy, 5% charge current accuracy, and operates in 1MHz fixed-frequency buck topology.
For engineers reviewing the LT3652EDD#PBF datasheet, LT3652EDD#PBF pinout, LT3652EDD#PBF application, or LT3652EDD#PBF equivalent, key selection considerations include its programmable 2A max charge current, resistor-set float voltage up to 14.4V, C/10 or timer-based termination, NTC temperature monitoring, and thermal foldback protection - all in a thermally enhanced 3mm × 3mm 12-lead DFN package.
Technical Context
The LT3652EDD#PBF implements average-current-mode control with a 1MHz fixed-frequency PWM architecture, using internal VFB = 3.3V reference and ITH error amplifier to servo average inductor current. Its input regulation loop dynamically reduces charge current to maintain VIN_REG ≥ 2.7V - enabling true MPPT tracking for solar panels.
It integrates precondition mode (15% max current until battery reaches 70% of VFLT), auto-recharge at 2.5% VFLT drop, and dual termination methods: C/10 detection (2.5% accuracy) or programmable safety timer (±10% accuracy, typical 3 hr). Thermal foldback activates near 125°C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.95V to 32V (40V absolute max); enables direct connection to 12V/24V automotive or solar panel inputs without external regulators. |
| Max Charge Current | Programmable up to 2A via RSENSE; 100mV sense threshold ensures precise CC control with minimal power loss. |
| Float Voltage Accuracy | ±0.5% (3.282V–3.318V at VFB); supports stable LiFePO₄ (7.2V), Li-ion (8.4V), or SLA (14.4V) battery chemistries. |
| Switch Characteristics | Integrated 35V/2.5A DMOS switch with 350mV on-drop at 2A; bootstrapped BOOST drive enables high-side saturation for >90% efficiency. |
| Termination Options | C/10 detection (±2.5%) or programmable timer (±10%, 3 hr typical); allows top-off charging below C/10 for full capacity in LiFePO₄ applications. |
| Thermal Management | Thermal foldback active above ~125°C; exposed pad (Pin 13) must be soldered to PCB ground for θJA = 43°C/W. |
| Quiescent Current | 85µA in standby mode after charge termination; enables multi-year operation in remote solar monitoring stations. |
Pinout & Package
LT3652EDD#PBF uses a thermally enhanced 12-lead 3mm × 3mm plastic DFN package with exposed GND pad (Pin 13) requiring PCB soldering for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (1) | Input supply rail | Accepts 4.95V–32V; powers internal circuitry and switch; requires low-ESR bulk capacitor (≥10µF). |
| VIN_REG (2) | MPPT regulation reference | Set to 2.7V threshold; connects to resistor divider from solar panel to enable peak power tracking. |
| SHDN (3) | Precision enable/disable | 1.2V rising threshold with 120mV hysteresis; enables UVLO integration or system-level power sequencing. |
| CHRG (4) | Open-collector status output | Sinks 10mA when charging (>C/10) or during thermal fault; high-Z otherwise - signals active charge state. |
| FAULT (5) | Open-collector fault indicator | Sinks 10mA during NTC over/under-temp, bad battery, or timer timeout; used for system-level fault logging. |
| TIMER (6) | Charge cycle timer programming | Capacitor-to-ground sets EOC time (tEOC = CTIMER × 4.4×10⁶); 0.68µF → 3 hr typical. |
| VFB (7) | Float voltage feedback | 3.3V internal reference; resistor divider from BAT to GND programs VFLT up to 14.4V. |
| NTC (8) | Battery temperature monitor | Sources 50µA; interfaces with 10kΩ B=3380 thermistor to suspend charge outside 0°C–40°C range. |
| BAT (9) | Battery output node | Connects to battery anode and decoupling cap (10µF min); serves as current sense reference (SENSE–BAT). |
| SENSE (10) | Current sense input | Measures voltage across RSENSE (0.05Ω @ 2A); sets average charge current with 5% accuracy. |
| BOOST (11) | Bootstrap supply for switch gate | Drives high-side switch; requires ≥1µF ceramic cap between BOOST and SW pins. |
| SW (12) | Switch node output | Connects to inductor; internal DMOS switch pulls to VIN when on; 0.175Ω effective RDS(on). |
| GND (13) | Power and thermal ground | Exposed pad; must be soldered to large PCB copper area for thermal dissipation and noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Input voltage regulation loop | Enables true MPPT by dynamically reducing charge current to hold VIN_REG ≥ 2.7V - maintains solar panel at VMP with >98% power tracking efficiency. |
| Precondition mode | Automatically limits charge current to 15% of programmed max until battery voltage reaches 70% of VFLT, preventing damage to deeply discharged LiFePO₄ cells. |
| Auto-recharge function | Triggers new charge cycle when battery voltage drops 2.5% below VFLT, ensuring maintenance of full capacity in intermittently loaded solar storage systems. |
| Dual termination logic | Supports either C/10 detection (for chemistry-specific full-charge assurance) or timer-based top-off (for guaranteed minimum charge duration in variable-load applications). |
| Binary-coded status outputs | CHRG and FAULT pins provide unambiguous, externally pulled-up digital signals for microcontroller monitoring - no level-shifting needed for 3.3V/5V logic. |
Applications
| Solar-Powered Remote Monitoring Station | LiFePO₄-Based Portable Instrument |
|---|---|
|
Use Scenario: Off-grid environmental sensor node powered by 17V solar panel, charging 2-cell (7.2V) LiFePO₄ battery. IC Role / Device Role / Timing Role: Primary battery management IC performing MPPT, CC/CV charging, temperature supervision, and auto-recharge. Use Value: Maintains >98% solar energy harvest across irradiance changes while delivering 2A peak charge current and protecting battery at 0°C–40°C. |
Use Scenario: Handheld multimeter with rechargeable 7.2V LiFePO₄ pack, charged via USB-powered 12V adapter. IC Role / Device Role / Timing Role: Standalone buck charger managing full-charge cycle, preconditioning, and standby leakage minimization. Use Value: Enables 2-hour full charge (2A) with <85µA standby drain, extending shelf life to >1 year without maintenance. |
| 12V Automotive Auxiliary Battery Charger | Industrial 24V Solar Backup System |
|
Use Scenario: Vehicle-mounted telemetry unit charging auxiliary SLA battery from alternator or solar input. IC Role / Device Role / Timing Role: Input-robust charger handling wide VIN transients (up to 40V abs max) and providing regulated 13.8V float. Use Value: Eliminates need for external blocking diode (VIN ≤ 4.2V not required) and tolerates load dump spikes without latch-up. |
Use Scenario: Telecom base station backup with 24V solar array charging 24V LiFePO₄ string (8S configuration). IC Role / Device Role / Timing Role: High-efficiency DC-DC charger with programmable 28.8V float and NTC-based thermal derating. Use Value: Delivers >90% conversion efficiency at 2A while halting charge if battery exceeds 40°C - critical for unventilated enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar battery charger applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC4000-1 | External MOSFET controller (no integrated switch); supports higher voltages (up to 36V) and currents (>5A); requires external power stage. | Used where >2A charge current or >32V input is required; lacks integrated MPPT loop - needs external ADC/controller for solar tracking. | Select LTC4000-1 only when scaling beyond LT3652EDD#PBF's 2A/32V limits or when discrete FET optimization is needed. |
| BQ24616RTWR | TI buck charger with 2.5A max current, 4.5V–28V input, but no native MPPT loop; uses external op-amp circuit for input regulation. | Requires additional components for solar MPPT; offers lower quiescent current (25µA) but lacks NTC interface and auto-recharge. | Choose BQ24616RTWR for cost-sensitive 24V SLA applications without solar input - avoid for LiFePO₄ solar systems needing integrated MPPT. |
Compared with LTC4000-1 and BQ24616RTWR, the LT3652EDD#PBF uniquely integrates MPPT, NTC monitoring, auto-recharge, and 2A switching in a single 3mm × 3mm DFN - reducing BOM count and layout complexity for mid-power solar battery systems.
Availability
LT3652EDD#PBF is available at Aetrix Electronics and suitable for solar-powered remote monitoring stations, portable LiFePO₄ instruments, and 12V/24V automotive auxiliary battery systems requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LT3652EDD#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 LT3652EDD#PBF belongs to Linear's Power Management product line, specifically engineered for high-input-voltage, multi-chemistry battery charging in energy-harvesting and off-grid applications - emphasizing integration, reliability, and solar MPPT capability.
FAQ
What battery chemistries does the LT3652EDD#PBF support?
The LT3652EDD#PBF supports Li-ion, Li-polymer, LiFePO₄, and sealed lead-acid (SLA) batteries. Its resistor-programmable float voltage (up to 14.4V) and precondition mode enable safe charging of deeply discharged LiFePO₄ cells, while the 0.5% VFB reference ensures tight regulation for all supported chemistries. The LT3652EDD#PBF does not require external circuitry to switch between chemistries - configuration is purely resistor-based.
How does the LT3652EDD#PBF implement maximum power point tracking (MPPT)?
The LT3652EDD#PBF implements hardware-based MPPT via its VIN_REG pin: a resistor divider from the solar panel output sets a target voltage (typically VMP), and the IC dynamically reduces charge current to maintain VIN_REG ≥ 2.7V. This closed-loop regulation holds the panel at peak power without microcontroller intervention. The LT3652EDD#PBF achieves >98% tracking efficiency in typical solar configurations, as verified in Figure TA01b of the datasheet.
Can the LT3652EDD#PBF operate without an external blocking diode?
Yes - the LT3652EDD#PBF eliminates the need for an external blocking diode when charging batteries with float voltages ≤ 4.2V, due to its internal reverse-current protection (<1µA leakage). For higher-voltage batteries (e.g., 7.2V LiFePO₄ or 12V SLA), a Schottky diode remains recommended to prevent battery discharge into the input when VIN is absent. This design choice reduces power loss and BOM cost in low-voltage applications.
What is the purpose of the TIMER pin on the LT3652EDD#PBF?
The TIMER pin on the LT3652EDD#PBF accepts a capacitor to set the end-of-charge (EOC) timeout, enabling timer-based termination instead of C/10 detection. With a 0.68µF capacitor, the LT3652EDD#PBF terminates after 3 hours ±10%, allowing top-off charging below C/10 for full capacity. It also enables bad-battery detection: if preconditioning lasts >22.5 minutes (1/8 of 3 hr), the LT3652EDD#PBF asserts FAULT and halts charging.
Does the LT3652EDD#PBF require special PCB layout considerations?
Yes - the LT3652EDD#PBF demands careful layout for thermal and noise performance. The exposed GND pad (Pin 13) must be soldered to a large PCB copper area for thermal dissipation (θJA = 43°C/W). High-current paths (VIN–SW–SENSE–BAT) require short, wide traces; BOOST capacitor must be placed within 2mm of SW/BOOST pins; and VFB/NTC traces should be routed away from noisy nodes to avoid measurement errors. These practices ensure stable 2A operation and accurate MPPT.
LT3652EDD#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)
LT3652EDD#PBF FAQ
1.How can I place an order for LT3652EDD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3652EDD#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 LT3652EDD#PBF reliable?
The price and inventory of LT3652EDD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3652EDD#PBF is usually 5 days.
3.What payment methods are accepted for LT3652EDD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3652EDD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3652EDD#PBF?
LT3652EDD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3652EDD#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 LT3652EDD#PBF?
For technical support, including LT3652EDD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3652EDD#PBF requirements.
6.How does Aetrix verify that LT3652EDD#PBF is sourced from the original manufacturer or authorized distributors?
All LT3652EDD#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 LT3652EDD#PBF meets industry standards.
7.What is the process for return or replacement of LT3652EDD#PBF?
All LT3652EDD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3652EDD#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 LT3652EDD#PBF part is unused and in its original packaging.
Return procedure for LT3652EDD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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