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Analog Devices Inc. LT3489EMS8E#PBF
- Part No.:
- LT3489EMS8E#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT3489EMS8E#PBF.pdf
- Description:
- IC REG BOOST ADJ 2.5A 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:675
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Product details
Overview
LT3489EMS8E#PBF from Analog Devices (formerly Linear Technology) is a fixed-frequency, current-mode boost DC/DC converter with an integrated 2.5A, 40V NPN switch, 2MHz switching frequency, and adjustable output up to 40V - designed for TFT-LCD bias supplies requiring compact, high-efficiency voltage generation from 2.6V–16V input.
For engineers reviewing the LT3489EMS8E#PBF datasheet, LT3489EMS8E#PBF pinout, LT3489EMS8E#PBF application, or LT3489EMS8E#PBF equivalent, key selection criteria include internal soft-start control via external capacitor, selectable internal/external loop compensation, low 110mV typical VCE(SAT) at 1A, 1.235V feedback reference, and MS8E package thermal performance with exposed ground pad.
Technical Context
The LT3489EMS8E#PBF employs constant-frequency current-mode control with peak-current limiting (2.5A nominal), internal 1.235V reference, and error amplifier transconductance of 100 μmhos. Its 2MHz oscillator enables use of sub-3mm inductors and ceramic capacitors while maintaining stable regulation across –40°C to 85°C.
Loop compensation flexibility supports both internal (VC tied to COMP) and external (RC/CC network from COMP to GND) configurations, enabling optimized transient response with low-ESR ceramic outputs. Soft-start is externally programmable via SS pin current source (10μA typical), controlling VC ramp rate and limiting inrush.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 2.6V to 16V - supports single-cell Li-ion, dual-cell alkaline, and industrial 3.3V/5V/12V rails without pre-regulation. |
| Switch Rating | 2.5A, 40V, 0.12Ω RDS(on)-equivalent - delivers >610mA at 8V from 3.3V input with minimal conduction loss. |
| Feedback Voltage | 1.235V ±1.2% - sets output via resistive divider (VOUT = 1.235 × (1 + R1/R2)), enabling precise 8V/23V/–8V triple-rail generation. |
| Switching Frequency | 2MHz ±10% - allows 2.2µH–4.7µH inductors and <20µF ceramic output caps, reducing solution height to <1.1mm. |
| Quiescent Current | 2mA typical (active), 1μA max (shutdown) - minimizes standby power in battery-powered GPS and DSL modem applications. |
| Soft-Start Control | 10μA constant current into SS pin - enables controlled input current ramp using 10nF–200nF capacitor, preventing input rail collapse. |
| Thermal Performance | θJA = 40°C/W, θJC = 10°C/W - requires exposed pad soldered to PCB ground plane for reliable 125°C junction operation. |
Pinout & Package
LT3489EMS8E#PBF uses an 8-lead MSOP package (MS8E) with exposed ground pad (Pin 9), measuring 3.00mm × 3.00mm × 1.10mm max. The exposed pad must be soldered to PCB ground for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VC (Pin 1) | Error amplifier output | Connects to external RC/CC compensation network or shorted to COMP for internal compensation; controls peak switch current. |
| FB (Pin 2) | Feedback input | Senses output divider voltage; 1.235V reference enables accurate VOUT setting; bias current ≤250nA minimizes divider error. |
| SHDN (Pin 3) | Shutdown control | Active-high enable (≥2V); pulls to GND to disable IC and reduce IQ to 1μA; must not float. |
| GND (Pin 4) | Power ground | Primary return path for switch current and analog circuitry; tie directly to local ground plane. |
| SW (Pin 5) | Switch collector | Connects to inductor and catch diode anode; high dV/dt node - minimize trace area to reduce EMI. |
| VIN (Pin 6) | Input supply | Accepts 2.6V–16V; requires local 2.2µF–4.7µF ceramic bypass capacitor placed adjacent to pin. |
| COMP (Pin 7) | Internal compensation | Tie to VC for internal compensation; tie to GND if unused; not connected in external compensation mode. |
| SS (Pin 8) | Soft-start capacitor | 10μA current source charges external cap; voltage rise rate determines startup slew and inrush limiting. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 2.5A, 40V NPN switch | Eliminates external transistor and driver, reducing BOM count and layout complexity for 8V/23V/–8V TFT-LCD bias rails. |
| 2MHz fixed-frequency operation | Enables use of 2.2µH–4.7µH ferrite inductors and multilayer ceramic capacitors, achieving <1.1mm profile solutions. |
| Programmable soft-start | External capacitor on SS pin controls input current ramp rate, preventing input voltage droop during startup in portable systems. |
| Selectable loop compensation | Supports either internal (VC–COMP short) or external (RC/CC from COMP to GND) compensation for optimal transient response with ceramic outputs. |
| Low 110mV VCE(SAT) at 1A | Reduces conduction loss and thermal stress, enabling >85% efficiency at 610mA output from 3.3V input in typical TFT-LCD AVDD supply. |
Applications
| Large TFT-LCD Panel Bias Supply | GPS Receiver Power Management |
|---|---|
|
Use Scenario: Generating +8V (AVDD), +23V (VON), and –8V (VOFF) from 3.3V input for active-matrix LCD gate/source drivers and backlight control. IC Role / Device Role / Timing Role: Primary boost controller managing three regulated outputs via diode-capacitor charge-pump topology with shared SW node. Use Value: Single-chip solution replaces discrete boost + inverter stages, reducing board area by >40% and eliminating external MOSFET gate drive complexity. |
Use Scenario: Providing stable 3.3V-to-5V step-up for GPS baseband ICs and RF front-end modules in handheld navigation devices. IC Role / Device Role / Timing Role: High-efficiency DC/DC converter delivering low-noise 5V at up to 650mA with fast load transient response (<50µs settling). Use Value: 2MHz switching avoids interference with GPS L1 band (1.575GHz); 1μA shutdown current extends battery life in always-on tracking mode. |
| DSL Modem Local Power Rail | Industrial Local Power Supply |
|
Use Scenario: Generating isolated 12V bias for line-driver amplifiers and PHY interface circuits in ADSL/VDSL modems operating from 3.3V or 5V system rails. IC Role / Device Role / Timing Role: Adjustable-output boost regulator with external feedback divider, supporting 12V @ 410mA from 3.3V input. Use Value: Internal 2.5A switch handles peak line-driver loads without derating; MS8E package fits tight modem PCB layouts. |
Use Scenario: Providing regulated 24V auxiliary supply from 12V industrial bus for sensors, actuators, and isolated communication interfaces. IC Role / Device Role / Timing Role: Wide-input (2.6V–16V), high-output (up to 40V) boost converter with robust thermal design (exposed pad + θJA=40°C/W). Use Value: Operates continuously over –40°C to 85°C ambient; 125°C max junction temperature ensures reliability in enclosed enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1935EDD#PBF | 2A switch, 1.2/2.7MHz dual-frequency option, ThinSOT-8 package, 38V max output | Limited to ≤2A load; lacks integrated soft-start capacitor control; smaller package but higher θJA | Preferred for space-constrained designs needing 2A output and dual-frequency flexibility, but requires external soft-start circuitry. |
| LT3479EDD#PBF | 3A switch, 3.5MHz, DFN-12 package, 40V max output, integrated current-sense amplifiers | Higher switching frequency demands tighter layout; no MSOP option; supports SEPIC/Cuk topologies | Chosen when >2.5A output or multi-topology support is required; not drop-in due to different pinout and compensation architecture. |
Compared with LT3489EMS8E#PBF, LT1935EDD#PBF offers smaller footprint but lower current capability and no programmable soft-start, while LT3479EDD#PBF provides higher current and frequency at the cost of increased layout sensitivity and absence of MSOP packaging.
Availability
LT3489EMS8E#PBF is available at Aetrix Electronics and suitable for TFT-LCD bias supplies, GPS receiver power management, and DSL modem local power rails requiring stable component supply, long-term lifecycle support, and consistent parametric performance.
Supply support for LT3489EMS8E#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 its precision analog and power management portfolio with full datasheet, simulation model, and application note continuity.
The LT3489 belongs to Linear's high-frequency boost converter product line, engineered specifically for compact, high-efficiency bias generation in display electronics and portable communications equipment.
FAQ
What is the maximum output voltage achievable with the LT3489EMS8E#PBF?
The LT3489EMS8E#PBF supports adjustable output voltages up to 40V, limited by its internal 40V-rated switch and absolute maximum SW pin rating. Output is set via external resistor divider on FB pin using VOUT = 1.235V × (1 + R1/R2); stable regulation is confirmed up to 23V in typical TFT-LCD applications per the cover-page schematic.
Does the LT3489EMS8E#PBF require external compensation components?
The LT3489EMS8E#PBF supports both internal and external loop compensation. For internal compensation, connect VC (Pin 1) directly to COMP (Pin 7). For external compensation, place an RC/CC network from COMP to GND - typical values are 20kΩ–100kΩ and 220pF–680pF - enabling optimization for specific output capacitor ESR and transient response requirements.
How is soft-start configured on the LT3489EMS8E#PBF?
Soft-start on the LT3489EMS8E#PBF is controlled by an external capacitor connected to the SS pin (Pin 8). A constant 10μA current charges this capacitor; the resulting voltage ramp controls the VC pin and limits peak switch current during startup. Typical capacitor values range from 10nF to 200nF - larger values yield slower, more controlled inrush.
What thermal considerations apply to the LT3489EMS8E#PBF MS8E package?
The LT3489EMS8E#PBF MS8E package features an exposed ground pad (Pin 9) that must be soldered to the PCB ground plane. With θJA = 40°C/W and θJC = 10°C/W, proper thermal vias under the pad are essential to maintain junction temperature ≤125°C under full 2.5A load. Layout guidelines specify multiple thermal vias tied to internal ground planes.
Can the LT3489EMS8E#PBF generate negative output voltages?
Yes - the LT3489EMS8E#PBF can generate negative outputs using an inverting (buck-boost or Ćuk) configuration. The datasheet's triple-output TFT-LCD reference design explicitly generates –8V (VOFF) alongside +8V and +23V using external diodes and capacitors, confirming validated negative rail capability with appropriate external component selection.
LT3489EMS8E#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Step-Up
- Output Configuration:
- Positive
- Topology:
- Boost
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.6V
- Voltage - Input (Max):
- 16V
- Voltage - Output (Min/Fixed):
- 2.6V
- Voltage - Output (Max):
- 40V (Switch)
- Current - Output:
- 2.5A (Switch)
- Frequency - Switching:
- 2MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-MSOP-EP
LT3489EMS8E#PBF FAQ
1.How can I place an order for LT3489EMS8E#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3489EMS8E#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 LT3489EMS8E#PBF reliable?
The price and inventory of LT3489EMS8E#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3489EMS8E#PBF is usually 5 days.
3.What payment methods are accepted for LT3489EMS8E#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3489EMS8E#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3489EMS8E#PBF?
LT3489EMS8E#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3489EMS8E#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 LT3489EMS8E#PBF?
For technical support, including LT3489EMS8E#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3489EMS8E#PBF requirements.
6.How does Aetrix verify that LT3489EMS8E#PBF is sourced from the original manufacturer or authorized distributors?
All LT3489EMS8E#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 LT3489EMS8E#PBF meets industry standards.
7.What is the process for return or replacement of LT3489EMS8E#PBF?
All LT3489EMS8E#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3489EMS8E#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 LT3489EMS8E#PBF part is unused and in its original packaging.
Return procedure for LT3489EMS8E#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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