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Analog Devices Inc. LT1618EMS#TRPBF
- Part No.:
- LT1618EMS#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LT1618EMS#TRPBF.pdf
- Description:
- IC REG BOOST ADJ 1.5A 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:9,310
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Product details
Overview
LT1618EMS#TRPBF from Analog Devices (acquired Linear Technology) is a constant-current/constant-voltage 1.4MHz step-up DC/DC converter in a 10-pin MSOP package. 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 voltage adjustable via IADJ pin - used in LED backlight drivers and USB-powered boost converters.
For engineers reviewing the LT1618EMS#TRPBF datasheet, LT1618EMS#TRPBF pinout, LT1618EMS#TRPBF application, or LT1618EMS#TRPBF equivalent, key selection criteria include input current limiting capability, dual-loop CC/CV control architecture, 1.4MHz switching frequency enabling compact magnetics, thermal performance of the MSOP package (θJA = 160°C/W), and compatibility with Schottky diode-based SEPIC/boost topologies.
Technical Context
The LT1618EMS#TRPBF implements fixed-frequency current-mode control with two independent feedback loops: one for output voltage regulation (FB pin, 1.263V reference) and one for input/output current regulation (ISP/ISN differential sensing, 50mV threshold). Its internal NPN switch exhibits 200mV VCE(SAT) at 1A, enabling high efficiency in low-input-voltage applications like single-cell Li-ion or USB-powered systems.
Operation transitions seamlessly between constant-current and constant-voltage modes based on which error amplifier input dominates. The IADJ pin allows dynamic reduction of the current sense threshold down to ~18mV using a DC bias or PWM-derived voltage, supporting brightness control in LED drivers and programmable charge current in battery chargers without resistor changes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 1.4MHz typical - enables use of sub-10µH inductors and 0805/1206 ceramic capacitors, reducing board area and EMI filter complexity. |
| Input Voltage Range | 1.6V to 18V - supports direct operation from single alkaline, NiMH, or Li-ion cells up to industrial 12V rails. |
| Output Voltage Max | 35V - sufficient for driving strings of 10+ white LEDs or powering 24V logic from low-voltage sources. |
| Current Sense Voltage | 50mV nominal (adjustable via IADJ) - minimizes power loss in sense resistor; ±5% tolerance over temperature ensures stable CC regulation. |
| VCE(SAT) @ 1A | 200mV - low conduction loss improves efficiency in high-current boost stages, especially below 3V input. |
| Reference Voltage | 1.263V at FB pin - sets output voltage with standard resistor dividers; ±1% initial accuracy ensures tight CV regulation. |
| Shutdown Threshold | 0.3V (max) - compatible with standard logic-low signals; 1V turn-on threshold provides noise margin. |
Pinout & Package
LT1618EMS#TRPBF is housed in a 10-pin MSOP package (3mm × 3mm, 0.85mm height) with exposed thermal pad not present - distinct from the DFN variant. Pin 6 is NC (no connection); all other pins match functional mapping of the DFN version.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FB (Pin 1) | Output voltage feedback input | Connects to resistor divider from VOUT; 1.263V reference sets regulated output voltage (e.g., R1/R2 = 909k/107k → 12V). |
| ISN (Pin 2) | Current sense inverting input | Connects to low-side of sense resistor; forms differential pair with ISP to detect load current. |
| ISP (Pin 3) | Current sense noninverting input | Connects to high-side of sense resistor; 50mV differential triggers CC mode; polarity critical for correct operation. |
| IADJ (Pin 4) | Current sense threshold adjust | DC voltage here linearly reduces sense threshold (e.g., 1V → ~18mV); tie to GND if unused. |
| GND (Pin 5) | Power and signal ground reference | Must connect to low-impedance PCB ground plane; separates analog and power return paths for stability. |
| NC (Pin 6) | No connection | Not bonded internally; leave unconnected and un-routed on PCB. |
| SW (Pin 7) | Internal NPN switch collector | Drives external inductor/diode node; requires short, low-inductance trace to minimize EMI and switching losses. |
| VIN (Pin 8) | Main input supply | Bypass with ≥1µF ceramic capacitor placed <1mm from pin; critical for high-frequency transient response. |
| SHDN (Pin 9) | Enable/disable control | Logic-high (>1V) enables converter; logic-low (<0.3V) disables with <1µA quiescent current. |
| VC (Pin 10) | Error amplifier compensation | External RC network (e.g., 2kΩ + 10nF) sets loop stability; omission causes oscillation or poor transient response. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-loop CC/CV regulation | Enables single-chip LED current control with overvoltage protection - eliminates need for separate current-sense IC or microcontroller feedback. |
| 1.4MHz fixed-frequency operation | Permits use of 4.7µH–10µH shielded ferrite inductors and 0805 ceramic caps, reducing solution size by >40% vs. 500kHz converters. |
| Adjustable current sense threshold | IADJ pin allows real-time current scaling (e.g., 50mA ↔ 200mA) using PWM or DAC, enabling dynamic LED dimming or adaptive battery charging. |
| Wide 1.6V–18V input range | Supports direct integration into energy-harvesting nodes (1.8V solar), single-cell batteries (1.5V alkaline), and industrial 12V systems without pre-regulation. |
| Low 200mV VCE(SAT) at 1A | Reduces conduction loss by >30% vs. comparable 300mV switches, improving efficiency by 2–4% at 500mA loads with 3V input. |
Applications
| LED Backlight Driver | USB-Powered Boost Converter |
|---|---|
Use Scenario: Driving 5–8 white LEDs in portable displays powered by single-cell Li-ion (2.7–4.2V) or USB 5V source. IC Role / Device Role / Timing Role: Constant-current regulator with integrated switch; maintains precise LED current despite VF variation and input droop. Use Value: Eliminates external current-sense op-amp and MOSFET; achieves ±5% current accuracy across –40°C to 85°C without calibration. | Use Scenario: Generating 12V rail from USB 5V port for peripherals requiring higher voltage, with input current limited to 100mA or 500mA. IC Role / Device Role / Timing Role: Input-current-limited boost converter; uses ISP/ISN to regulate average inductor current, preventing host port overload. Use Value: Complies with USB 2.0 current limits while delivering stable 12V output; no software or host negotiation required. |
| Battery Charger Controller | Input-Current-Limited SEPIC Converter |
Use Scenario: Charging single-cell Li-ion or NiMH batteries from variable sources (e.g., solar panel, USB, or wall adapter). IC Role / Device Role / Timing Role: Constant-current/constant-voltage charger; IADJ adjusts charge current dynamically; FB sets termination voltage. Use Value: Achieves full CC/CV profile with <2% voltage error and <5% current error - meets JEITA battery charging specifications. | Use Scenario: Providing isolated 5V output from 5V USB input with short-circuit protection, used in field-deployable sensors. IC Role / Device Role / Timing Role: Input-current-regulated SEPIC controller; ISP/ISN senses input current to limit surge and enable robust short-circuit recovery. Use Value: Delivers >75% efficiency at 200mA load while surviving indefinite output shorts - impossible with standard boost topology. |
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 |
|---|---|---|---|
| LT3465EMS#TRPBF | Integrated Schottky diode; 1.2MHz switching; 2.7–16V input; 34V max output; 350mA switch current. | Lacks independent ISP/ISN pins - uses single-ended current sense; no IADJ pin for analog current adjustment. | Choose LT3465EMS#TRPBF when board space is critical and integrated diode simplifies layout, but avoid if precise input-current limiting or analog dimming is required. |
| LT1932EMS8#TRPBF | White LED-specific; 1.2MHz; 1–10V input; 34V max output; constant-current only (no CV mode); 1.2mA quiescent current. | Fixed CC architecture - no FB pin for voltage regulation; optimized for LED forward voltage matching, not general-purpose boost. | Choose LT1932EMS8#TRPBF for dedicated LED driver designs where overvoltage protection is handled externally and efficiency above 90% is prioritized. |
Compared with LT3465EMS#TRPBF and LT1932EMS8#TRPBF, the LT1618EMS#TRPBF uniquely supports true dual-loop CC/CV operation with adjustable current threshold and wide 1.6V input capability - making it suitable for battery charging, USB power delivery, and multi-source LED systems where flexibility outweighs integration density.
Availability
LT1618EMS#TRPBF is available at Aetrix Electronics and suitable for LED backlight drivers, USB-powered boost converters, and battery charging circuits requiring stable component supply, long-term industrial availability, and guaranteed parametric performance across –40°C to 85°C.
Supply support for LT1618EMS#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, Inc. (ADI) is a global semiconductor leader specializing in high-performance analog, mixed-signal, and digital signal processing technologies.
The LT1618EMS#TRPBF belongs to Linear Technology's legacy high-efficiency DC/DC converter product line, designed specifically for compact, high-frequency boost and SEPIC applications demanding precise current regulation and wide input voltage range.
FAQ
What is the maximum output voltage supported by the LT1618EMS#TRPBF?
The LT1618EMS#TRPBF supports an absolute maximum output voltage of 35V, as specified in its Absolute Maximum Ratings table. This enables driving medium-length LED strings or generating auxiliary rails for industrial sensors. Operation above 35V risks permanent damage to the internal NPN switch and is not supported under any conditions.
How does the IADJ pin function in the LT1618EMS#TRPBF?
The IADJ pin on the LT1618EMS#TRPBF allows analog adjustment of the current sense threshold from 50mV down to approximately 18mV. Applying a DC voltage (e.g., 1V) reduces the ISP–ISN differential required to enter constant-current mode. If unused, IADJ must be tied to GND - leaving it floating causes undefined regulation behavior in the LT1618EMS#TRPBF.
Can the LT1618EMS#TRPBF be used in SEPIC topology?
Yes, the LT1618EMS#TRPBF is explicitly validated for SEPIC operation, as shown in Typical Application TA09. Its ability to regulate input current via ISP/ISN provides inherent short-circuit protection in SEPIC configurations - a key advantage over basic boost converters. Layout must follow recommended high-frequency node routing to maintain stability.
What is the thermal resistance (θJA) of the LT1618EMS#TRPBF in its MSOP package?
The LT1618EMS#TRPBF in the 10-pin MSOP package has a junction-to-ambient thermal resistance (θJA) of 160°C/W, measured under standard JEDEC JESD51-7 conditions. This value assumes a 1-inch² copper pad with 2oz copper and no thermal vias; adding thermal vias to the GND pad can reduce θJA by 20–30°C/W in production layouts.
Does the LT1618EMS#TRPBF require an external Schottky diode?
Yes, the LT1618EMS#TRPBF requires an external Schottky diode (e.g., ON Semiconductor MBR0520) connected between SW and VOUT. Unlike some newer boost ICs, it does not integrate a power diode. The diode must have a voltage rating exceeding the maximum output voltage (≥40V recommended) and a current rating matching peak inductor current.
LT1618EMS#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- 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-MSOP
LT1618EMS#TRPBF FAQ
1.How can I place an order for LT1618EMS#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1618EMS#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 LT1618EMS#TRPBF reliable?
The price and inventory of LT1618EMS#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1618EMS#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1618EMS#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1618EMS#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1618EMS#TRPBF?
LT1618EMS#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1618EMS#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 LT1618EMS#TRPBF?
For technical support, including LT1618EMS#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1618EMS#TRPBF requirements.
6.How does Aetrix verify that LT1618EMS#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1618EMS#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 LT1618EMS#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1618EMS#TRPBF?
All LT1618EMS#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1618EMS#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 LT1618EMS#TRPBF part is unused and in its original packaging.
Return procedure for LT1618EMS#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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