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Analog Devices Inc. LT3653EDCB#TRMPBF
- Part No.:
- LT3653EDCB#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LT3653EDCB#TRMPBF.pdf
- Description:
- IC REG BUCK ADJ 1.2A 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:500
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Product details
Overview
LT3653EDCB#TRMPBF from Analog Devices (formerly Linear Technology) is a monolithic current-mode PWM step-down regulator with programmable output current limit, designed for pre-regulation in high-voltage battery charger power paths. It operates from 7.5V to 30V input, delivers up to 1.2A output current, integrates an internal boost diode and thermal protection, and features Bat-Track™ VC control for Li-ion charger coordination in portable USB devices and automotive battery regulation.
For engineers reviewing the LT3653EDCB#TRMPBF datasheet, LT3653EDCB#TRMPBF pinout, LT3653EDCB#TRMPBF application, or LT3653EDCB#TRMPBF equivalent, key selection criteria include its 1.5MHz switching frequency, 60V transient tolerance, programmable 0.4–1.2A current limit via ILIM resistor, HVOK fault-status signaling, and thermally enhanced 2mm × 3mm DFN package with exposed GND pad.
Technical Context
The LT3653EDCB#TRMPBF implements constant-frequency current-mode control with internal slope compensation and a 1.5MHz oscillator. Its VC pin serves as both error amplifier output and external battery tracking interface, enabling dynamic output voltage adjustment by downstream chargers like LTC4098.
Input overvoltage lockout activates at 33V (typ), with 1V hysteresis, and undervoltage lockout engages below 7V (typ), ensuring safe operation across 7.5–30V nominal input. The integrated bipolar NPN switch features 275mV VCE(SAT) at 1A, and the internal boost diode enables efficient gate drive without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 7.5V to 30V nominal; supports 60V non-repetitive transients without damage |
| Output Current Limit | Programmable 0.4A–1.2A via ILIM resistor; enables precise system power dissipation control |
| Switching Frequency | 1.5MHz typical (1.35–1.65MHz range); allows compact 4.7μH inductor and low-profile layout |
| Thermal Protection | Junction shutdown at >125°C; exposed pad requires PCB soldering for θJA = 64°C/W |
| VC Pin Function | Internal error amp output; accepts external voltage for Bat-Track™ battery voltage following |
| HVOK Status Signal | Open-drain output indicating valid bias rails and absence of OV/UV/OT faults |
| Integrated Boost Diode | On-chip Schottky-equivalent diode eliminates external boost capacitor requirement |
Pinout & Package
LT3653EDCB#TRMPBF is housed in an 8-lead (2mm × 3mm) plastic DFN package with exposed GND pad (Pin 9), requiring soldering to PCB for thermal performance. Package outline complies with LTC DWG #05-08-1718 Rev A.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 1) | Main power input | Supplies internal regulator and power switch; bypass with ≥4.7μF ceramic capacitor |
| HVOK (Pin 2) | Status output | Open-drain indicator of healthy bias rails and absence of OV/UV/OT faults |
| VC (Pin 3) | Error amplifier output | Controls peak switch current; connects to charger's VC pin for Bat-Track™ operation |
| ILIM (Pin 4) | Current limit programming | Resistor-to-GND sets output current limit (e.g., 27.4kΩ → 1.2A) |
| VOUT (Pin 5) | Negative sense terminal | Connected to negative side of internal current-sense resistor; regulated to ≤4.8V |
| ISENSE (Pin 6) | Positive sense terminal | Positive input to current-sense circuit; also anode of internal boost diode |
| BOOST (Pin 7) | Gate drive supply | Internally connected to cathode of boost diode; provides >VIN voltage for switch saturation |
| SW (Pin 8) | Power switch node | Connects to inductor, catch diode, and boost capacitor; carries high di/dt switching current |
| Exposed Pad (Pin 9) | Thermal/GND connection | Mandatory GND tie; requires multiple vias to inner ground plane for thermal management |
Key Features
| Feature | Design Value |
|---|---|
| Wide Input Range with Transient Tolerance | 7.5–30V operation + 60V non-repetitive transient survival enables use with unregulated 12V/24V supplies and automotive sources |
| Programmable Output Current Limit | 0.4–1.2A set via single ILIM resistor; prevents overload on downstream charger and protects inductor/diode |
| Bat-Track™ VC Interface | Direct VC pin connection to LTC4098/LTC3557 enables adaptive output voltage regulation just above battery voltage |
| No Reverse Discharge Path | Internal blocking prevents VOUT-to-VIN discharge during input open/short, protecting upstream sources |
| Thermally Enhanced DFN Package | 2mm × 3mm footprint with exposed GND pad achieves θJA = 64°C/W - critical for 1.2A continuous operation in compact layouts |
Applications
| Portable USB Battery Charging | Automotive Battery Regulation |
|---|---|
Use Scenario: Dual-input (USB + wall adapter) power path for cameras, MP3 players, and PDAs with single-cell Li-ion batteries. IC Role / Device Role / Timing Role: Pre-regulator that lowers high-voltage input to optimal level for downstream Bat-Track™ charger (e.g., LTC4098), minimizing charger power loss. Use Value: Enables >90% system efficiency at 1.2A load by reducing voltage differential across charger IC, verified in TA01a and TA03 reference designs. | Use Scenario: 12V/24V vehicle electrical system powering infotainment or telematics modules with embedded Li-ion backup. IC Role / Device Role / Timing Role: High-input-voltage buck converter providing stable 4.8V output while surviving load-dump transients up to 60V. Use Value: Eliminates need for external TVS or discrete OVP circuitry due to built-in 60V transient tolerance and 33V OVLO threshold. |
| Multiple-Source Battery Chargers | Industrial Portable Equipment |
Use Scenario: Power manager in field-deployable medical or test equipment accepting AC adapter, PoE, or solar input. IC Role / Device Role / Timing Role: Input-stage regulator that conditions variable high-voltage sources before feeding multi-chemistry battery charging ICs. Use Value: Programmable current limit (via RILIM) allows consistent thermal design across input source variations without changing PCB layout. | Use Scenario: Ruggedized handheld terminals or barcode scanners operating from 12V industrial power rails. IC Role / Device Role / Timing Role: Primary DC/DC converter delivering regulated 4.8V to system load and battery charger under wide ambient temperature (–40°C to 125°C). Use Value: Guaranteed –40°C to 125°C operation (E-grade) and thermal shutdown prevent field failures in sealed enclosures with limited airflow. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3685EMSE#TRPBF | Higher 38V max input, 2A output, 2.4MHz switching; no integrated boost diode; MSOP-10E package | Requires external boost capacitor; better suited for higher-current, lower-profile designs where board space permits extra component | Select when >1.2A output or >30V nominal input is required; not drop-in due to different pinout and missing boost diode |
| LTC3557EUF#TRPBF | PMIC integrating USB/WALL dual-input power manager, triple buck, and Li-ion charger; no standalone current-limit programming | Replaces entire power architecture (LT3653 + charger IC); eliminates VC/HVOK interconnect but increases BOM complexity | Choose for new designs needing full USB-compliant power management; not a functional substitute for LT3653EDCB#TRMPBF's discrete pre-regulator role |
Compared with LT3653EDCB#TRMPBF, LT3685EMSE#TRPBF offers higher current and input voltage but demands external boost components and layout changes, while LTC3557EUF#TRPBF consolidates functionality into a PMIC at the cost of flexibility and discrete current-limit tuning.
Availability
LT3653EDCB#TRMPBF is available at Aetrix Electronics and suitable for portable USB devices, automotive battery regulation, and multiple-source battery chargers requiring stable component supply, extended temperature operation, and high transient immunity.
Supply support for LT3653EDCB#TRMPBF 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 and power management portfolio with rigorous reliability standards and automotive-grade qualification.
The LT3653EDCB#TRMPBF belongs to Linear's high-voltage monolithic buck regulator family, engineered specifically for battery charger pre-regulation in space-constrained, high-efficiency portable and automotive systems.
FAQ
What is the maximum input voltage transient rating for LT3653EDCB#TRMPBF?
The LT3653EDCB#TRMPBF withstands non-repetitive 60V transients at the VIN pin for up to 1 second, per Absolute Maximum Ratings. Its overvoltage lockout triggers at 33V (typical), allowing safe operation with 12V/24V industrial or automotive supplies subject to load dump. This rating is validated in the datasheet's "Absolute Maximum Ratings" table and confirmed in Typical Performance Characteristic G06.
How is output current limit programmed on LT3653EDCB#TRMPBF?
The LT3653EDCB#TRMPBF uses an external resistor from ILIM (Pin 4) to GND to set output current limit between 0.4A and 1.2A. For example, a 27.4kΩ resistor yields 1.2A (per Table 1 in the datasheet). The internal circuit averages inductor ripple current and pulls VC low if the average exceeds the programmed threshold, directly controlling power dissipation in the system load and charger.
Does LT3653EDCB#TRMPBF require an external boost capacitor?
No, the LT3653EDCB#TRMPBF integrates a BOOST diode and does not require an external boost capacitor. The internal diode (anode at ISENSE, cathode at BOOST) forms a charge pump with the external 0.1μF capacitor on the BOOST pin to generate gate-drive voltage above VIN. This integration reduces component count and PCB area versus controllers requiring external bootstrap circuits.
What is the function of the HVOK pin on LT3653EDCB#TRMPBF?
The HVOK pin on LT3653EDCB#TRMPBF is an open-drain status output indicating that internal bias supplies are active and no faults (input overvoltage, undervoltage, or overtemperature) are present. It sinks current when faulty and floats high (with external pull-up) when healthy, enabling direct connection to the WALL pin of LTC4098 or similar chargers to enable system power-up only when input is valid.
Can LT3653EDCB#TRMPBF operate without external compensation components?
Yes, the LT3653EDCB#TRMPBF is internally compensated with a pole-zero network on the VC node, eliminating the need for external compensation components in standard configurations. Stability is maintained across the full input range (7.5–30V), load range (0–1.2A), and temperature range (–40°C to 125°C), as verified in the "Operation" section and Typical Performance Characteristic G10.
LT3653EDCB#TRMPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 7.5V
- Voltage - Input (Max):
- 30V
- Voltage - Output (Min/Fixed):
- 4.8V
- Voltage - Output (Max):
- 6V
- Current - Output:
- 1.2A
- Frequency - Switching:
- 1.5MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-DFN (2x3)
LT3653EDCB#TRMPBF FAQ
1.How can I place an order for LT3653EDCB#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3653EDCB#TRMPBF 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 LT3653EDCB#TRMPBF reliable?
The price and inventory of LT3653EDCB#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3653EDCB#TRMPBF is usually 5 days.
3.What payment methods are accepted for LT3653EDCB#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3653EDCB#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3653EDCB#TRMPBF?
LT3653EDCB#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3653EDCB#TRMPBF 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 LT3653EDCB#TRMPBF?
For technical support, including LT3653EDCB#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3653EDCB#TRMPBF requirements.
6.How does Aetrix verify that LT3653EDCB#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LT3653EDCB#TRMPBF 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 LT3653EDCB#TRMPBF meets industry standards.
7.What is the process for return or replacement of LT3653EDCB#TRMPBF?
All LT3653EDCB#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3653EDCB#TRMPBF, 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 LT3653EDCB#TRMPBF part is unused and in its original packaging.
Return procedure for LT3653EDCB#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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