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Analog Devices Inc. LT3653EDCB#TRPBF
- Part No.:
- LT3653EDCB#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LT3653EDCB#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 1.2A 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,647
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Product details
Overview
LT3653EDCB#TRPBF from Analog Devices (formerly Linear Technology) is a high-voltage, current-mode PWM step-down regulator with programmable output current limit, designed for pre-regulation in single-cell Li-ion battery charger power path architectures. 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 HVOK status indication and Bat-Track™ VC pin control for system-level efficiency optimization in portable USB devices and automotive battery regulation.
For engineers reviewing the LT3653EDCB#TRPBF datasheet, LT3653EDCB#TRPBF pinout, LT3653EDCB#TRPBF application, or LT3653EDCB#TRPBF equivalent, key selection considerations include its 1.5MHz fixed switching frequency, 7.5–30V input range with 60V transient tolerance, programmable 0.4–1.2A output current limit via ILIM resistor, integrated BOOST diode, and thermally enhanced 2mm × 3mm DFN package with exposed GND pad.
Technical Context
The LT3653EDCB#TRPBF implements constant-frequency current-mode control using an internal 1.5MHz oscillator and internal slope compensation. Its VC pin serves as the error amplifier output, externally clamped and directly interfaced with battery charger ICs (e.g., LTC4098) to enable Bat-Track adaptive output voltage control - maintaining VOUT just above battery voltage for minimal power loss across the charger.
Input undervoltage lockout (6.5–7.5V) and overvoltage lockout (30–36V) are internally implemented, with capability to withstand non-repetitive 60V transients. Output current limiting uses averaged inductor current sensing via ISENSE/VOUT pins and an external ILIM resistor, enabling precise system power dissipation control without requiring oversized magnetics or catch diodes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 7.5V to 30V continuous operation; supports unregulated 12V/24V supplies and automotive inputs. |
| Output Current Limit | Programmable 0.4A to 1.2A via ILIM resistor; enables tight thermal management of downstream charger and system load. |
| Switching Frequency | 1.35MHz to 1.65MHz (typ. 1.5MHz); allows compact 4.7μH inductor and low-profile ceramic input/output capacitors. |
| Integrated Boost Diode | On-chip Schottky-equivalent diode eliminates external boost diode; reduces BOM count and PCB area in DFN layout. |
| HVOK Status Pin | Open-drain output indicating presence of internal bias rails and absence of OV/UV/OT faults; used for charger enable sequencing. |
| Thermal Protection | Internal overtemperature shutdown at ~150°C junction; recovers automatically after cooldown - prevents permanent damage during overload. |
| Package | 8-lead 2mm × 3mm DFN (DCB) with exposed GND pad; θJA = 64°C/W enables >1A operation at +85°C ambient with proper PCB copper. |
Pinout & Package
LT3653EDCB#TRPBF is housed in an 8-lead plastic DFN package (2mm × 3mm) with exposed GND pad (Pin 9), requiring soldering to PCB ground plane for thermal performance. The package is RoHS-compliant and lead-free.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 1) | Main power input | Supplies internal regulator and power switch; must be bypassed locally with ≥4.7μF X7R ceramic capacitor. |
| HVOK (Pin 2) | Status output | Open-drain indicator: logic high when internal bias is stable and no OV/UV/OT fault exists; drives WALL pin on LTC4098. |
| VC (Pin 3) | Error amplifier output | Interface point for Bat-Track control; connected to charger's VC pin to override regulation and minimize charger voltage drop. |
| ILIM (Pin 4) | Current limit programming | Resistor-to-GND sets average output current limit (0.4–1.2A); e.g., 27.4kΩ yields 1.2A typical. |
| VOUT (Pin 5) | Current sense reference | Negative terminal of internal current-sense resistor; regulates max VOUT to 4.8V; connects to battery charger BAT pin. |
| ISENSE (Pin 6) | Current sense input | Positive terminal of internal current-sense resistor; also anode of integrated BOOST diode. |
| BOOST (Pin 7) | Bootstrap supply | Provides gate drive voltage >VIN to internal NPN switch; requires 0.1μF ceramic capacitor to SW. |
| SW (Pin 8) | Power switch node | Drives external inductor and catch diode; high di/dt node requiring short, low-inductance routing. |
| Exposed Pad (Pin 9) | Thermal & electrical GND | Mandatory solder connection to PCB ground plane; primary thermal path - use ≥4 thermal vias. |
Key Features
| Feature | Design Value |
|---|---|
| Wide Input Range with Transient Tolerance | Operates 7.5–30V; survives 60V/1s non-repetitive transients - suitable for automotive and industrial 24V systems. |
| Programmable Output Current Limit | 0.4–1.2A set by single ILIM resistor - replaces discrete current-limit circuits and simplifies system-level power budgeting. |
| Bat-Track™ VC Interface | Direct analog control of VOUT by external charger IC - maintains optimal VOUT = VBAT + ~300mV for peak charging efficiency. |
| No Reverse Discharge Path | Blocks VOUT-to-VIN backflow during VIN open/short - protects input source and preserves battery charge in wall-adapter-disconnected state. |
| Integrated BOOST Diode | Eliminates external bootstrap diode - reduces component count, footprint, and forward voltage loss in high-frequency operation. |
| Thermally Enhanced DFN | 2mm × 3mm package with exposed GND pad achieves θJC = 10°C/W - enables 1.2A continuous output at +85°C ambient with 2oz copper. |
Applications
| USB-Powered Portable Devices | Automotive Battery Pre-Regulator |
|---|---|
|
Use Scenario: Powering MP3 players, digital cameras, and PDAs from dual-input (USB + wall adapter) sources where battery charging efficiency and system thermal management are critical. IC Role / Device Role: Pre-regulator that steps down high-voltage wall adapter (12V/24V) to ~4.8V before feeding LTC4098 or similar charger IC. Use Value: Enables Bat-Track operation so VOUT tracks battery voltage, reducing power loss in charger by >30% versus fixed-output pre-regulators. |
Use Scenario: Regulating 12V/24V vehicle battery or alternator output to feed a Li-ion backup battery charger in telematics or ADAS modules. IC Role / Device Role: High-input-voltage buck converter with 60V transient immunity, providing stable 4.8V rail to battery management IC under load dump conditions. Use Value: Withstands ISO 7637-2 Pulse 5a (60V/100ms) without external TVS, eliminating surge protection components and saving board space. |
| Multi-Source Battery Charger Systems | Industrial Portable Equipment |
|
Use Scenario: Dual-input (USB + Firewire or PoE-derived 24V) battery-powered test equipment requiring seamless source handover and consistent charge voltage. IC Role / Device Role: Input selector and pre-regulator that maintains constant VOUT regardless of input source, enabling single-charger architecture. Use Value: HVOK pin signals valid input presence to host controller; ILIM resistor allows identical current limit across both sources - simplifying firmware and safety certification. |
Use Scenario: Handheld medical monitors or ruggedized data loggers powered by removable Li-ion packs and field-deployable 24V adapters. IC Role / Device Role: Primary DC/DC regulator delivering regulated 4.8V to system load and battery charger, with reverse discharge blocking during hot-swap battery replacement. Use Value: Prevents battery discharge into dead or disconnected input - extends runtime and avoids unexpected shutdown during battery maintenance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-voltage buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3685EMSE#TRPBF | Higher 38V max input, 2A output, 2.4MHz switching, MSOP-10E package; no integrated BOOST diode. | Requires external bootstrap diode; better suited for higher-current, higher-frequency designs where PCB area permits larger package. | Select when >1.2A output or >1.5MHz frequency is required; avoid if minimizing BOM count and DFN footprint is priority. |
| LTC3630AEDD#TRPBF | Lower 3.6–25V input, 1.5A output, 3MHz, 10-lead DFN; includes power good and soft-start; no HVOK or Bat-Track VC interface. | Lacks HVOK status and VC pin - cannot interface with Bat-Track chargers; optimized for general-purpose high-efficiency buck, not battery charger pre-regulation. | Select for non-battery applications needing tighter output accuracy and PG signal; not a functional substitute for LT3653EDCB#TRPBF in charger systems. |
Compared with LT3653EDCB#TRPBF, LT3685EMSE#TRPBF offers higher current and frequency but increases component count and board area, while LTC3630AEDD#TRPBF omits critical battery-charger interface features - making LT3653EDCB#TRPBF uniquely suited for Bat-Track-based single-cell Li-ion charging architectures.
Availability
LT3653EDCB#TRPBF is available at Aetrix Electronics and suitable for battery-powered equipment, portable USB devices (cameras, MP3 players, PDAs), and automotive battery regulation requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for LT3653EDCB#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 full product support, documentation, and manufacturing continuity for all Linear parts including the LT3653 series.
The LT3653EDCB#TRPBF belongs to Linear's high-voltage monolithic buck regulator family, engineered specifically for battery charger pre-regulation in multi-source portable systems - emphasizing efficiency, thermal robustness, and seamless integration with Bat-Track™ charger ICs.
FAQ
What is the maximum input voltage transient rating for LT3653EDCB#TRPBF?
The LT3653EDCB#TRPBF is rated to withstand non-repetitive 60V transients for up to 1 second at the VIN pin, per Absolute Maximum Ratings. This enables reliable operation in automotive and industrial environments subject to load dump or inductive switching spikes without requiring external TVS diodes - a key advantage over standard 40V-rated buck regulators.
How does the LT3653EDCB#TRPBF implement Bat-Track functionality?
The LT3653EDCB#TRPBF implements Bat-Track via its VC pin, which is the output of the internal error amplifier. When connected to the VC pin of a compatible charger IC (e.g., LTC4098), the charger overrides LT3653EDCB#TRPBF's internal regulation loop to dynamically adjust VOUT to maintain ~300mV above battery voltage - maximizing charging efficiency and minimizing power loss across the charger.
Can LT3653EDCB#TRPBF operate without an external ILIM resistor?
No - the LT3653EDCB#TRPBF requires an external resistor from ILIM (Pin 4) to GND to set the output current limit. Without it, the current limit defaults to minimum (~0.4A) and cannot be adjusted. Table 1 in the datasheet specifies RILIM values (e.g., 27.4kΩ for 1.2A), and the resistor must be placed close to the ILIM pin with short traces to ensure accurate current sensing.
What is the purpose of the HVOK pin on LT3653EDCB#TRPBF?
The HVOK pin on LT3653EDCB#TRPBF is an open-drain status output that goes high only when internal bias supplies are stable and no faults (input overvoltage, undervoltage, or overtemperature) are present. It is used to signal a battery charger IC (e.g., LTC4098's WALL pin) that the LT3653EDCB#TRPBF is ready to deliver regulated power - enabling safe, sequenced system startup.
Does LT3653EDCB#TRPBF require an external boost diode?
No - the LT3653EDCB#TRPBF integrates a BOOST diode internally (anode at ISENSE, cathode at BOOST). This eliminates the need for an external bootstrap diode, reducing BOM count and PCB footprint. A 0.1μF ceramic capacitor must still be placed between BOOST and SW pins to complete the bootstrap circuit for the internal NPN power switch.
LT3653EDCB#TRPBF 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#TRPBF FAQ
1.How can I place an order for LT3653EDCB#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3653EDCB#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 LT3653EDCB#TRPBF reliable?
The price and inventory of LT3653EDCB#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3653EDCB#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3653EDCB#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3653EDCB#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3653EDCB#TRPBF?
LT3653EDCB#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3653EDCB#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 LT3653EDCB#TRPBF?
For technical support, including LT3653EDCB#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3653EDCB#TRPBF requirements.
6.How does Aetrix verify that LT3653EDCB#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3653EDCB#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 LT3653EDCB#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3653EDCB#TRPBF?
All LT3653EDCB#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3653EDCB#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 LT3653EDCB#TRPBF part is unused and in its original packaging.
Return procedure for LT3653EDCB#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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