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Analog Devices Inc. LT3653IDCB#TRPBF
- Part No.:
- LT3653IDCB#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LT3653IDCB#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 1.2A 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,713
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Product details
Overview
LT3653IDCB#TRPBF 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 path systems. 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 signaling - used with LTC4098 and other Bat-Track™ chargers in portable USB devices and automotive battery regulation.
For engineers reviewing the LT3653IDCB#TRPBF datasheet, LT3653IDCB#TRPBF pinout, LT3653IDCB#TRPBF application, or LT3653IDCB#TRPBF equivalent, key selection criteria include its 1.5MHz switching frequency, 60V transient tolerance, programmable 0.4–1.2A current limit via ILIM resistor, reverse discharge blocking, and thermally enhanced 2mm × 3mm DFN package with exposed GND pad.
Technical Context
The LT3653IDCB#TRPBF 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 VOUT adjustment by companion chargers like LTC4098.
Input overvoltage lockout activates at 33V (typ), with 1V hysteresis, and undervoltage lockout engages below 7V (typ); the device sustains non-repetitive 60V transients without damage. The integrated BOOST diode and bipolar NPN switch support efficient operation across the full 7.5–30V input range while blocking reverse discharge from VOUT to VIN.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 7.5V to 30V continuous; withstands 60V non-repetitive transients - enables use with 12V/24V industrial supplies and automotive sources. |
| Output Current Limit | Programmable 0.4A to 1.2A via ILIM resistor - provides precise system-level power dissipation control and protects downstream components. |
| Switching Frequency | 1.5MHz (±150kHz) - allows compact 4.7μH inductor and low-profile ceramic input/output capacitors. |
| VOUT Regulation | 4.8V nominal (VC open) - optimized for single-cell Li-ion battery charging with Bat-Track™ adaptive control. |
| Thermal Resistance | θJA = 64°C/W, θJC = 10°C/W - requires soldered exposed pad to PCB ground plane for reliable 1.2A operation at 125°C junction temperature. |
| HVOK Status Output | Open-drain logic-high when internal bias is stable and no OV/UV/OT fault - signals readiness to battery charger ICs such as LTC4098. |
| Integrated Boost Diode | Forward drop ≤1.2V at 60mA - eliminates external boost diode, reducing BOM count and board area in space-constrained designs. |
Pinout & Package
LT3653IDCB#TRPBF is housed in an 8-lead (2mm × 3mm) plastic DFN package with exposed GND pad (Pin 9), requiring soldering to PCB for thermal and electrical 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 X7R ceramic capacitor near pin. |
| HVOK (Pin 2) | Status output | Open-drain indicator of valid bias supply and absence of OV/UV/OT faults; drives WALL pin on LTC4098. |
| VC (Pin 3) | Error amplifier output / Bat-Track interface | Controls peak switch current; connected to charger's VC pin for adaptive VOUT regulation slightly above battery voltage. |
| ILIM (Pin 4) | Current limit programming | Resistor-to-GND sets average output current limit (e.g., 27.4kΩ = 1.2A); enables tight thermal management in portable systems. |
| VOUT (Pin 5) | Negative sense terminal | Connected to negative side of internal current-sense resistor; clamped to ≤4.8V; no reverse discharge path to VIN. |
| ISENSE (Pin 6) | Positive current sense / BOOST diode anode | Senses inductor current for regulation; also serves as anode of internal BOOST diode - connects to cathode of external catch diode. |
| BOOST (Pin 7) | Bootstrap drive voltage | Provides >VIN voltage to fully saturate internal NPN switch; generated via external 0.1μF capacitor and internal diode. |
| SW (Pin 8) | Power switch node | Drives external inductor and catch diode; high dI/dt node - must be routed short and adjacent to VIN and ISENSE for EMI control. |
| Exposed Pad (Pin 9) | Thermal & electrical GND | Mandatory solder connection to PCB ground plane with multiple vias - critical for thermal resistance <10°C/W and stable 1.2A operation. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable Output Current Limit | 0.4A–1.2A set by single ILIM resistor - enables scalable thermal design and consistent power delivery across varying battery chemistries. |
| Bat-Track™ Compatibility | VC pin directly interfaces with LTC4098 and similar chargers - allows dynamic VOUT adjustment to minimize voltage drop across charger, maximizing end-to-end efficiency. |
| 60V Transient Tolerance | Withstands non-repetitive 60V input spikes without latch-up or damage - eliminates need for external TVS in automotive and industrial 24V systems. |
| No Reverse Discharge Path | Internal blocking prevents VOUT from discharging into VIN during input removal or fault - preserves battery charge in always-on portable equipment. |
| Integrated BOOST Diode | Eliminates external diode in bootstrap circuit - reduces component count, layout area, and forward conduction loss in high-frequency operation. |
Applications
| USB-C Portable Power Bank | Automotive Infotainment Power Supply |
|---|---|
Use Scenario: Dual-input (USB + 12V car adapter) power bank with single-cell Li-ion battery and system load. IC Role / Device Role / Timing Role: Pre-regulator that steps down 12V automotive input to ~4.8V before LTC4098 charger, enabling Bat-Track™-optimized charging and "instant-on" system operation. Use Value: Delivers stable 1.2A output with 60V transient immunity and zero reverse leakage - extends battery runtime and ensures robust startup under cold-cranking conditions. | Use Scenario: Power management for head-unit display, audio DSP, and USB peripherals in 12V vehicle systems. IC Role / Device Role / Timing Role: High-voltage buck converter supplying regulated 4.8V to battery charger IC and system rails, coordinated via HVOK status signal. Use Value: Maintains regulation during engine cranking dips (down to 6.5V UVLO) and alternator surges (up to 60V transients) - eliminates brownouts and resets in safety-critical infotainment modules. |
| Industrial Handheld Scanner | Medical Point-of-Care Monitor |
Use Scenario: Ruggedized barcode scanner powered by removable Li-ion pack and wall adapter. IC Role / Device Role / Timing Role: Input pre-regulator interfacing with LTC4098 to manage dual-source charging and system power path. Use Value: Programmable 0.85A current limit (via 33.2kΩ ILIM) matches scanner's peak load profile - prevents thermal throttling during extended scanning bursts. | Use Scenario: Battery-backed vital signs monitor with USB and 24V medical-grade wall adapter inputs. IC Role / Device Role / Timing Role: High-efficiency pre-regulator delivering 4.8V to battery charger and system load, with HVOK signaling readiness to host MCU. Use Value: Exposed-pad DFN package enables compact, thermally robust layout meeting IEC 60601 creepage/clearance requirements - supports continuous 8-hour operation at ambient 40°C. |
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 |
|---|---|---|---|
| LTC3630AEDD#PBF | Higher 36V max input, 1.5A output, but no integrated BOOST diode or HVOK pin; requires external diode and status monitoring. | Used in higher-input industrial systems where 60V transient tolerance is less critical than 36V continuous rating. | Select when needing >30V continuous input or higher output current, and when external diode integration is acceptable. |
| LT3685EMSE#TRPBF | Same 60V transient rating and Bat-Track compatibility, but 2A output and 24-pin QFN package - larger footprint and higher cost. | Preferred in multi-rail PMIC designs requiring higher current or additional enable/control pins. | Choose only if 1.2A is insufficient or if QFN thermal performance justifies added board area and assembly complexity. |
Compared with LTC3630AEDD#PBF and LT3685EMSE#TRPBF, the LT3653IDCB#TRPBF uniquely balances 1.2A capability, 2mm × 3mm DFN size, integrated BOOST diode, and HVOK status in a single compact solution - making it optimal for space-constrained, dual-input battery-powered systems where Bat-Track coordination is required.
Availability
LT3653IDCB#TRPBF is available at Aetrix Electronics and suitable for USB-C power banks, automotive infotainment systems, and industrial handheld scanners requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for LT3653IDCB#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 its legacy of high-performance analog and power management ICs for precision, industrial, and automotive applications.
The LT3653IDCB#TRPBF belongs to Linear's high-voltage DC/DC converter product line, engineered specifically for battery charger pre-regulation in portable and automotive systems with wide-input, transient-tolerant, and Bat-Track–enabled architectures.
FAQ
What is the maximum allowable input voltage transient for LT3653IDCB#TRPBF?
The LT3653IDCB#TRPBF withstands non-repetitive input transients up to 60V for durations ≤1 second, per Absolute Maximum Ratings. Continuous operation remains limited to 7.5V–30V. This 60V tolerance enables robust deployment in automotive and industrial environments where load-dump events occur, without requiring external TVS diodes - a key differentiator from standard 36V-input buck regulators.
How does the LT3653IDCB#TRPBF implement Bat-Track™ functionality?
The LT3653IDCB#TRPBF implements Bat-Track™ via its VC pin, which serves as the error amplifier output and is directly connected to the VC pin of compatible chargers like LTC4098. The charger overrides the LT3653IDCB#TRPBF's internal regulation loop to dynamically adjust VOUT to ~300mV above battery voltage - minimizing power loss across the charger and maximizing overall system efficiency during Li-ion charging cycles.
What is the purpose of the HVOK pin on LT3653IDCB#TRPBF?
The HVOK pin on LT3653IDCB#TRPBF is an open-drain status output indicating that internal bias supplies are stable and no faults (input overvoltage, undervoltage, or overtemperature) are present. It drives the WALL pin on LTC4098 to signal "high voltage ready," enabling the charger to initiate charging only when the LT3653IDCB#TRPBF is actively regulating - preventing premature battery discharge or unsafe charging conditions.
Can LT3653IDCB#TRPBF operate without an external catch diode?
No - the LT3653IDCB#TRPBF requires an external Schottky catch diode (e.g., DFLS240) connected between SW and VOUT. While it integrates a BOOST diode for the bootstrap circuit, the catch diode handles inductor freewheeling current during switch-off. The datasheet specifies using a 40V-rated Schottky due to the LT3653IDCB#TRPBF's 60V transient tolerance and internal OVP clamping at 33V.
What thermal design considerations apply to LT3653IDCB#TRPBF in continuous 1.2A operation?
For continuous 1.2A operation, the LT3653IDCB#TRPBF requires its exposed pad (Pin 9) to be soldered to a large PCB ground plane with ≥4 thermal vias (0.3mm diameter) connecting to inner/secondary ground layers. With θJA = 64°C/W, ambient temperatures above 60°C necessitate derating - e.g., at 85°C ambient, max sustainable load drops to ~0.9A. Layout must minimize SW/VIN loop area to reduce EMI-induced heating.
LT3653IDCB#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)
LT3653IDCB#TRPBF FAQ
1.How can I place an order for LT3653IDCB#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3653IDCB#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 LT3653IDCB#TRPBF reliable?
The price and inventory of LT3653IDCB#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3653IDCB#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3653IDCB#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3653IDCB#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3653IDCB#TRPBF?
LT3653IDCB#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3653IDCB#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 LT3653IDCB#TRPBF?
For technical support, including LT3653IDCB#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3653IDCB#TRPBF requirements.
6.How does Aetrix verify that LT3653IDCB#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3653IDCB#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 LT3653IDCB#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3653IDCB#TRPBF?
All LT3653IDCB#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3653IDCB#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 LT3653IDCB#TRPBF part is unused and in its original packaging.
Return procedure for LT3653IDCB#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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