My Inquiry
My Account
Analog Devices Inc. LT1618EDD#TRPBF
- Part No.:
- LT1618EDD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LT1618EDD#TRPBF.pdf
- Description:
- IC REG BOOST ADJ 1.5A 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:26,063
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LT1618EDD#TRPBF from Analog Devices (formerly Linear Technology) is a constant-current/constant-voltage 1.4MHz step-up DC/DC converter in a 10-pin 3mm × 3mm DFN package with exposed pad. It operates from 1.6V to 18V input, delivers up to 35V output, regulates current with ±5% accuracy over temperature, and features 50mV current sense threshold for LED backlight and battery charging applications.
For engineers reviewing the LT1618EDD#TRPBF datasheet, LT1618EDD#TRPBF pinout, LT1618EDD#TRPBF application, or LT1618EDD#TRPBF equivalent, key selection criteria include input current limiting capability, IADJ-adjustable current sense voltage, 200mV switch saturation at 1A, thermal performance via exposed GND pad, and compatibility with USB-powered boost/SEPIC topologies.
Technical Context
The LT1618EDD#TRPBF implements fixed-frequency current-mode control with dual feedback loops: one for output voltage regulation (FB pin, 1.263V reference), another for precise input or output current regulation (ISP/ISN differential sensing). Its 1.4MHz switching frequency enables compact magnetics and low-profile passive components.
It integrates an NPN power switch with 200mV VCE(SAT) at 1A, supports shutdown via SHDN pin (1V turn-on threshold), and allows dynamic current adjustment through the IADJ pin - applying 1V reduces current sense threshold from 50mV to ~18mV, enabling PWM-brightness control in LED drivers without resistor changes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 1.6V to 18V - supports single-cell Li-ion, multi-cell alkaline, and USB 5V inputs without external LDO. |
| Switching Frequency | 1.4MHz (typ) - enables use of sub-10µH inductors and ceramic capacitors under 10µF for space-constrained designs. |
| Current Sense Threshold | 50mV (adjustable via IADJ) - sets accurate current limit with minimal power loss across sense resistor. |
| Output Voltage Max | 35V - sufficient for driving strings of white LEDs or powering 24V industrial interfaces from low-voltage sources. |
| Switch VCE(SAT) | 200mV at 1A - ensures high efficiency (>85% typical at 100mA–300mA loads) and low thermal dissipation in DFN package. |
| Reference Voltage | 1.263V at FB pin - enables precise output voltage setting with standard resistor dividers (±1% accuracy). |
| Operating Temp Range | –40°C to +85°C - qualified for industrial and automotive cabin ambient environments. |
Pinout & Package
LT1618EDD#TRPBF uses a 10-pin (3mm × 3mm × 0.8mm) plastic DFN package with exposed thermal pad (Pin 11), which must be soldered to PCB ground for optimal thermal performance (θJA = 43°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FB (Pin 1) | Feedback Input | Monitors output voltage via resistor divider; 1.263V reference sets regulated VOUT. |
| ISN (Pin 2) | Current Sense (–) | Inverting input of current sense amplifier; used with ISP to measure differential voltage across sense resistor. |
| ISP (Pin 3) | Current Sense (+) | Non-inverting input of current sense amplifier; forms 50mV threshold window with ISN. |
| IADJ (Pin 4) | Current Sense Adjust | DC voltage input that linearly reduces current sense threshold (e.g., 1V → ~18mV); enables analog/PWM brightness or charge current control. |
| GND (Pin 5) | Power Ground | Main return path for internal circuits and exposed pad connection point for thermal management. |
| SW (Pin 6) | Switch Node | Collector of internal NPN transistor; connects to inductor and Schottky diode anode; requires minimal trace area to reduce EMI. |
| VIN (Pin 8) | Input Supply | Primary power input; must be bypassed with ≥1µF ceramic capacitor placed adjacent to pin. |
| SHDN (Pin 9) | Shutdown Control | Logic-level enable: >1V = active, <0.3V = shutdown (quiescent current <1µA). |
| VC (Pin 10) | Error Amplifier Compensation | External RC network (e.g., 2kΩ + 10nF) sets loop stability; critical for transient response in CC/CV transitions. |
Key Features
| Feature | Design Value |
|---|---|
| Constant-current + constant-voltage operation | Automatically transitions between modes - e.g., maintains fixed LED current until overvoltage condition triggers voltage clamp. |
| Adjustable current sense threshold | IADJ pin allows real-time reduction of sense voltage from 50mV down to ~10mV, enabling fine-grained current control without hardware changes. |
| High-efficiency integrated switch | 200mV VCE(SAT) at 1A minimizes conduction loss and enables >85% efficiency at 200mA load with 5V→12V conversion. |
| Wide input voltage range | 1.6V start-up supports single NiMH or LiFePO4 cells, while 18V max rating accommodates 12V rail transients and industrial supplies. |
| Thermally enhanced DFN package | Exposed GND pad (Pin 11) reduces junction-to-ambient thermal resistance to 43°C/W, allowing 1.5W continuous power dissipation at +85°C ambient. |
Applications
| LED Backlight Driver | USB-Powered Boost Converter |
|---|---|
Use Scenario: Driving 5–12 white LEDs in series from a 3.3V or 5V USB source in portable displays. IC Role / Device Role / Timing Role: Constant-current regulator with adjustable IADJ-based dimming and overvoltage protection via FB pin. Use Value: Enables uniform LED brightness across varying input voltage and temperature, with <±5% current accuracy eliminating need for external current DACs. | Use Scenario: Generating stable 12V output from 5V USB port for external peripherals requiring higher voltage rails. IC Role / Device Role / Timing Role: Fixed-frequency boost controller with input current limiting (via ISP/ISN) to comply with USB 500mA specification. Use Value: Prevents host port overcurrent shutdown by regulating peak input current to 450mA, while maintaining >75% efficiency at full load. |
| Battery Charger Controller | Input-Current-Limited SEPIC Converter |
Use Scenario: Charging single-cell Li-ion batteries from variable sources (e.g., solar, USB, or wall adapter) with programmable CC/CV profile. IC Role / Device Role / Timing Role: Dual-loop regulator using ISP/ISN for constant-current charge phase and FB for 4.2V termination voltage. Use Value: Eliminates need for separate charge management IC; IADJ pin allows microcontroller to dynamically scale charge current during thermal foldback. | Use Scenario: Powering isolated 5V or 12V loads from noisy or fluctuating 3.6–5V sources (e.g., automotive accessory ports) with short-circuit protection. IC Role / Device Role / Timing Role: SEPIC topology controller using ISP/ISN to regulate input current, providing inherent short-circuit immunity. Use Value: Limits inrush and fault current to safe levels (<500mA) while maintaining regulated output even during output shorts - no external current-limiting FET required. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar constant-current boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3465AEDD#TRPBF | Higher 2.7MHz switching frequency; integrated Schottky diode; lower 2.7V min input; 350mA switch current limit. | Better suited for ultra-compact LED drivers where board space is critical; lacks IADJ pin for analog current adjustment. | Select LT3465AEDD#TRPBF when footprint and integration outweigh need for wide input range and adjustable current sense. |
| LTC3401EDD#TRPBF | Synchronous rectification; 3MHz switching; 0.5V min input; 1A switch current; no built-in current sense amplifier. | Requires external current sense and op-amp for CC mode; optimized for ultra-low-input applications like coin-cell devices. | Choose LTC3401EDD#TRPBF only if synchronous efficiency and sub-1V start-up are mandatory and external current sensing is acceptable. |
Compared with LT3465AEDD#TRPBF and LTC3401EDD#TRPBF, the LT1618EDD#TRPBF uniquely combines wide 1.6V–18V input range, integrated dual-loop CC/CV control, and IADJ-based current scaling - making it the only option among the three that supports both USB-powered boost and Li-ion charging from a single BOM without external amplifiers or level shifters.
Availability
LT1618EDD#TRPBF is available at Aetrix Electronics and suitable for LED backlight drivers, USB-powered boost converters, and battery charging systems requiring stable component supply, long-term lifecycle support, and guaranteed parametric compliance across –40°C to +85°C.
Supply support for LT1618EDD#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 precision analog and power management product lines with full datasheet, simulation model, and application support.
The LT1618EDD#TRPBF belongs to Linear's high-efficiency DC/DC converter family designed specifically for constant-current applications including LED lighting, optical networking, and portable battery charging - emphasizing accuracy, thermal robustness, and ease of loop compensation.
FAQ
What is the minimum input voltage required for LT1618EDD#TRPBF to start switching?
The LT1618EDD#TRPBF starts switching at 1.6V input voltage, verified across temperature and load conditions per the Electrical Characteristics table. Below this, the internal bias circuitry cannot sustain oscillator operation or gate drive. This enables direct operation from single NiMH or LiFePO4 cells without pre-regulation. The LT1618EDD#TRPBF datasheet specifies 1.6V as the absolute minimum functional VIN.
How does the IADJ pin affect current regulation in LT1618EDD#TRPBF?
The IADJ pin on the LT1618EDD#TRPBF linearly reduces the current sense threshold from 50mV downward - applying 1V yields ~18mV, and 1.6V forces shutdown. This allows analog dimming or charge current scaling without changing RSENSE. The LT1618EDD#TRPBF uses this to maintain precise current control while simplifying system-level current programming.
Can LT1618EDD#TRPBF be used in SEPIC topology, and what modifications are needed?
Yes, the LT1618EDD#TRPBF supports SEPIC operation using the same pinout and compensation network as boost mode. External changes include adding a coupling capacitor between SW and the second inductor, and relocating the current sense resistor to the input side for accurate input current limiting. The LT1618EDD#TRPBF's ISP/ISN inputs function identically in SEPIC for short-circuit protection.
What is the thermal performance difference between LT1618EDD#TRPBF and the MSOP variant LT1618EMS8#TRPBF?
The LT1618EDD#TRPBF has θJA = 43°C/W due to its exposed thermal pad soldered to PCB ground, versus θJA = 160°C/W for the MSOP variant. At 1W dissipation, junction temperature rise is ~43°C vs. ~160°C - making the LT1618EDD#TRPBF suitable for sustained high-current operation in compact enclosures where airflow is limited.
Does LT1618EDD#TRPBF require external compensation components, and what are typical values?
Yes, the LT1618EDD#TRPBF requires external RC compensation on the VC pin to stabilize the error amplifier loop. Typical values are 2kΩ in series with 10nF to ground - this provides a dominant pole for stable operation across most boost/SEPIC configurations. The LT1618EDD#TRPBF datasheet confirms these values achieve >45° phase margin with 10µH inductors and ceramic outputs.
LT1618EDD#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Up
- Output Configuration:
- Positive
- Topology:
- Boost
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 1.6V
- Voltage - Input (Max):
- 18V
- Voltage - Output (Min/Fixed):
- 1.263V
- Voltage - Output (Max):
- 36V (Switch)
- Current - Output:
- 1.5A (Switch)
- Frequency - Switching:
- 1.4MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-DFN (3x3)
LT1618EDD#TRPBF FAQ
1.How can I place an order for LT1618EDD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1618EDD#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 LT1618EDD#TRPBF reliable?
The price and inventory of LT1618EDD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1618EDD#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1618EDD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1618EDD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1618EDD#TRPBF?
LT1618EDD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1618EDD#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 LT1618EDD#TRPBF?
For technical support, including LT1618EDD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1618EDD#TRPBF requirements.
6.How does Aetrix verify that LT1618EDD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1618EDD#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 LT1618EDD#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1618EDD#TRPBF?
All LT1618EDD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1618EDD#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 LT1618EDD#TRPBF part is unused and in its original packaging.
Return procedure for LT1618EDD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT1618EDD#TRPBF Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
