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Analog Devices Inc. LT1618EMS#PBF
- Part No.:
- LT1618EMS#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LT1618EMS#PBF.pdf
- Description:
- IC REG BOOST ADJ 1.5A 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:5,382
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Product details
Overview
LT1618EMS#PBF from Analog Devices (formerly Linear Technology) is a constant-current/constant-voltage 1.4MHz step-up DC/DC converter in a 10-pin MSOP package, operating from 1.6V to 18V input and delivering up to 35V output with ±5% current accuracy and ±1% voltage regulation-used in LED backlight drivers and USB-powered boost converters.
For engineers reviewing the LT1618EMS#PBF datasheet, LT1618EMS#PBF pinout, LT1618EMS#PBF application, or LT1618EMS#PBF equivalent, key selection criteria include its dual feedback loop architecture, 50mV current sense threshold, IADJ-adjustable current limit, 200mV switch saturation voltage at 1A, and compatibility with low-profile 10µH inductors for space-constrained designs.
Technical Context
The LT1618EMS#PBF implements fixed-frequency current-mode control with two independent feedback loops: one voltage-controlled (FB pin, 1.263V reference) and one current-controlled (ISP/ISN differential sense, 50mV nominal threshold). It transitions seamlessly between constant-current and constant-voltage modes based on which error amplifier input dominates.
Its internal NPN power switch features 200mV VCE(SAT) at 1A and supports duty cycles up to 92%. The IADJ pin enables dynamic current adjustment via external DC voltage or PWM-derived DC bias, reducing the current sense voltage per VIADJ = 1.263V − (0.8 × VIADJ/25), down to ~18mV at 1V applied.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 1.4MHz typical - enables use of compact 10µH inductors and ceramic capacitors without audible noise. |
| Input Voltage Range | 1.6V to 18V - supports single-cell Li-ion, multi-cell alkaline, and USB-powered systems. |
| Output Voltage | Up to 35V - sufficient for driving strings of white LEDs or powering 12V/24V rails from low-voltage sources. |
| Current Sense Threshold | 50mV (adjustable via IADJ) - sets precise current limit with ±5% accuracy over temperature. |
| VCE(SAT) @ 1A | 200mV - minimizes conduction loss and thermal rise in high-current boost applications. |
| Reference Voltage (FB) | 1.263V ±1% - defines regulated output voltage via R1/R2 divider with tight tolerance. |
| Quiescent Current | 2.7mA typical (active), 0.1–1µA (shutdown) - extends battery life in portable devices. |
Pinout & Package
LT1618EMS#PBF is housed in a 10-lead plastic MSOP package (3mm × 3mm, 0.85mm height), with exposed pad not present (unlike DFN variant). Pin 6 is NC (no connection); all other pins match functional mapping in the DD package except SW location.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FB (Pin 1) | Feedback Input | Connects to resistor divider to set output voltage; 1.263V reference ensures ±1% regulation accuracy. |
| ISN (Pin 2) | Current Sense (−) | Inverting input of current sense amplifier; used with ISP to monitor inductor current for CC mode. |
| ISP (Pin 3) | Current Sense (+) | Noninverting input of current sense amplifier; differential voltage across ISP/ISN sets current limit. |
| IADJ (Pin 4) | Current Adjust Input | DC voltage here scales down current sense threshold linearly-enables brightness/charge rate control without resistor change. |
| GND (Pin 5) | Ground Reference | Primary ground return for analog and power sections; must be low-impedance local plane connection. |
| NC (Pin 6) | No Connection | Not bonded internally; leave unconnected and un-routed on PCB. |
| SW (Pin 7) | Switch Collector | Internal NPN collector node; connects to inductor/diode; requires minimal trace area to reduce EMI. |
| VIN (Pin 8) | Input Supply | Power input (1.6–18V); must be bypassed with ≥1µF ceramic capacitor placed adjacent to pin. |
| SHDN (Pin 9) | Shutdown Control | Logic-level enable: >1V = active, <0.3V = shutdown; draws only 0.1–1µA in shutdown. |
| VC (Pin 10) | Compensation Node | External RC network (e.g., 2kΩ + 10nF) sets loop stability; critical for transient response in CC/CV transition. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-loop CC/CV operation | Automatically selects constant-current or constant-voltage mode based on load demand-ideal for LED drivers and battery chargers. |
| Adjustable current limit via IADJ | Reduces current sense threshold from 50mV to ~18mV using external DC or filtered PWM signal-enables analog/digital dimming without hardware change. |
| High-efficiency NPN switch | 200mV VCE(SAT) at 1A minimizes conduction loss and thermal stress in continuous 350mA+ output designs. |
| Wide input range (1.6V–18V) | Supports direct operation from single Li-ion (2.7–4.2V), two NiMH (2.4–3.0V), or USB 5V with headroom for voltage drops. |
| 1.4MHz fixed switching frequency | Permits use of tiny 3.3µH–10µH ferrite inductors and 1–10µF ceramic capacitors-reduces solution size by >40% vs. 500kHz converters. |
Applications
| LED Backlight Driver | USB-Powered Boost Converter |
|---|---|
Use Scenario: Driving 10–20 white LEDs in series from a 3.3V or 5V USB source in portable displays. IC Role / Device Role / Timing Role: Constant-current source regulating LED string current while maintaining stable output voltage under varying forward voltage drop. Use Value: Achieves ±5% current matching across LEDs and eliminates thermal runaway via accurate 50mV current sensing and IADJ-based dimming. | Use Scenario: Generating 12V rail from 5V USB port to power external peripherals requiring higher voltage. IC Role / Device Role / Timing Role: Step-up DC/DC controller with input current limiting (via ISP/ISN) to comply with USB 100mA/500mA specifications. Use Value: Enables safe USB host compliance with selectable 100mA/500mA input limits and fast 1.4MHz transient response during load steps. |
| Battery Charger Controller | Input-Current-Limited SEPIC Converter |
Use Scenario: Charging single-cell Li-ion batteries from variable sources (e.g., solar, USB, or low-voltage adapters). IC Role / Device Role / Timing Role: Constant-current/constant-voltage charger managing CC phase (e.g., 500mA) then CV phase (4.2V) with overvoltage protection via FB pin. Use Value: Eliminates need for external charge management IC; uses R1/R2 to set end-of-charge voltage and IADJ to taper charge current. | Use Scenario: Providing isolated 5V output from 5V USB input with short-circuit protection in industrial sensors. IC Role / Device Role / Timing Role: SEPIC topology controller using ISP/ISN to regulate input current-provides inherent short-circuit protection unlike boost-only topologies. Use Value: Limits inrush and fault current to safe levels (<500mA) while maintaining regulated output even during sustained short circuits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-up DC/DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3465AES6#TRMPBF | Integrated Schottky diode, 1.2MHz, 2.7V–16V input, 34V max output, 1.9mA IQ, ThinSOT-6 package. | Lacks separate ISP/ISN pins and IADJ adjustability; optimized for fixed-current LED drivers-not suitable for programmable CC/CV or SEPIC. | Select when board space is critical and integrated diode simplifies layout; avoid when adjustable current limit or input-current sensing is required. |
| LT1930ES5#TRMPBF | 1.2MHz/2.2MHz selectable, 1A switch, 2.6V–16V input, 34V max output, 4.2mA IQ, TSOT-23-5 package. | No current-sense inputs or IADJ; only voltage-mode control with FB feedback-cannot implement true constant-current regulation. | Choose for high-efficiency boost where only regulated voltage is needed; not viable for LED current control or battery charging. |
Compared with LT3465AES6#TRMPBF and LT1930ES5#TRMPBF, the LT1618EMS#PBF uniquely supports dual-loop CC/CV regulation with external current sense resistors and IADJ-based current scaling-making it the only option among the three capable of precision current-source operation in LED drivers and battery chargers.
Availability
LT1618EMS#PBF is available at Aetrix Electronics and suitable for LED backlight drivers, USB-powered boost converters, battery chargers, and input-current-limited SEPIC converters requiring stable component supply and long-term industrial availability.
Supply support for LT1618EMS#PBF 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 legacy Linear parts including the LT1618 series.
The LT1618EMS#PBF belongs to Linear's high-efficiency, current-mode DC/DC converter product line-designed specifically for space-constrained, battery-powered applications demanding precise constant-current regulation alongside voltage control.
FAQ
What is the maximum output voltage supported by the LT1618EMS#PBF?
The LT1618EMS#PBF supports an output voltage up to 35V, as specified in the Absolute Maximum Ratings and confirmed in Typical Applications circuits (e.g., 35V LED driver in TA05). This limit is enforced by internal switch breakdown voltage and external component selection-output capacitors and diodes must be rated accordingly.
How does the IADJ pin affect current regulation in the LT1618EMS#PBF?
The IADJ pin on the LT1618EMS#PBF linearly reduces the current sense threshold from 50mV downward: VISENSE = 1.263V − (0.8 × VIADJ/25). At 1V applied, threshold drops to ~18mV-allowing reduced LED current or battery charge rate without changing the sense resistor. Exceeding 1.6V halts switching.
Can the LT1618EMS#PBF be used in SEPIC topology, and how is input current limited?
Yes, the LT1618EMS#PBF supports SEPIC operation using the same ISP/ISN current sense inputs. Input current is limited by placing the sense resistor between VIN and the input capacitor (not upstream of it), enabling accurate average inductor current regulation and intrinsic short-circuit protection-demonstrated in TA09 and TA10.
What is the purpose of the NC pin (Pin 6) on the LT1618EMS#PBF MSOP package?
Pin 6 on the LT1618EMS#PBF is designated NC (No Connection) in the MSOP package-it is not internally bonded and serves no electrical function. It must remain unconnected and un-routed on the PCB; floating or grounding this pin has no effect on operation but may risk contamination or solder bridging.
Does the LT1618EMS#PBF require external compensation, and what are typical values?
Yes, the LT1618EMS#PBF uses the VC pin for external frequency compensation. A standard network of 2kΩ in series with 10nF to ground provides stable loop response for most boost applications. For PWM-driven IADJ dimming, omitting the resistor adds filtering at the VC node to suppress ripple from the error amplifier output.
LT1618EMS#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tube
- 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#PBF FAQ
1.How can I place an order for LT1618EMS#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1618EMS#PBF 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#PBF reliable?
The price and inventory of LT1618EMS#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1618EMS#PBF is usually 5 days.
3.What payment methods are accepted for LT1618EMS#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1618EMS#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1618EMS#PBF?
LT1618EMS#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1618EMS#PBF 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#PBF?
For technical support, including LT1618EMS#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1618EMS#PBF requirements.
6.How does Aetrix verify that LT1618EMS#PBF is sourced from the original manufacturer or authorized distributors?
All LT1618EMS#PBF 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#PBF meets industry standards.
7.What is the process for return or replacement of LT1618EMS#PBF?
All LT1618EMS#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1618EMS#PBF, 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#PBF part is unused and in its original packaging.
Return procedure for LT1618EMS#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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