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Analog Devices Inc. LTC3499EMS8#TRPBF
- Part No.:
- LTC3499EMS8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC3499EMS8#TRPBF.pdf
- Description:
- IC REG BOOST ADJ 750MA 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,021
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Product details
Overview
LTC3499EMS8#TRPBF from Analog Devices (formerly Linear Technology) is a synchronous step-up DC/DC converter with integrated reverse-battery protection, designed for low-input-voltage portable systems. It operates from 1.8V to 5.5V input, delivers adjustable 2V–6V output at up to 750mA peak switch current, and features true output disconnect, 1.2MHz fixed-frequency PWM, and <1µA shutdown supply current. It is used in medical equipment and handheld instruments requiring robust polarity reversal immunity and high light-load efficiency.
For engineers reviewing the LTC3499EMS8#TRPBF datasheet, LTC3499EMS8#TRPBF pinout, LTC3499EMS8#TRPBF application, or LTC3499EMS8#TRPBF equivalent, this page provides verified technical context, package-validated pin functions, confirmed electrical specifications, real-world application mappings, and two rigorously validated alternative parts - all grounded in the official LTC3499/LTC3499B datasheet (3499fc) and Linear/Analog Devices product documentation.
Technical Context
The LTC3499EMS8#TRPBF implements current-mode control with internal slope compensation, enabling stable regulation and fast transient response without complex loop compensation. Its architecture integrates a P-channel and N-channel synchronous MOSFET pair with RDS(ON) of 0.58Ω/0.45Ω (PMOS/NMOS at VOUT = 5V), eliminating external diode losses and supporting >94% peak efficiency.
Reverse-battery protection is achieved via internal comparator circuitry that blocks conduction when VIN falls below –0.3V, limiting reverse current to ≤5µA while maintaining zero load current during shutdown. The device supports VIN > VOUT pass-through mode with thermal-limited current derating, and includes antiringing control (250Ω switch) to suppress EMI in discontinuous conduction mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 1.8V to 5.5V - enables direct operation from two alkaline/NiMH cells or single Li-ion cell without pre-regulation. |
| Output Voltage Range | 2V to 6V - adjustable via external resistor divider on FB pin; 1.22V reference ensures ±2.5% accuracy over temperature. |
| Switching Frequency | 1.2MHz (±20%) - allows use of compact 2.2µH–10µH inductors and ceramic capacitors; reduces solution footprint. |
| Peak Switch Current | 750mA minimum - sets maximum deliverable output current under boost conditions; limits inductor size and thermal design. |
| Shutdown Supply Current | <1µA - enables ultra-low-power standby in battery-critical applications such as medical sensors and portable diagnostics. |
| Reverse-Battery Current | ≤5µA at VIN = –6V - prevents battery drain and IC damage during accidental polarity reversal; no external FET required. |
| Soft-Start Control | Externally programmable via SS pin capacitor (tSS ≈ CSS × 200 ms) - eliminates inrush current into output capacitance during power-up. |
Pinout & Package
Package: 8-Lead Plastic MSOP (MS8), 3mm × 3mm footprint, 1.10mm max height, exposed thermal pad not present (unlike DFN variant); θJA = 160°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SHDN (Pin 1) | Enable/disable control input | Pulled <0.2V to shut down IC; pulled >1.2V to enable; supports logic-level or analog voltage drive; reverse-battery tolerant. |
| VIN (Pin 2) | Main input power supply | Supplies bias and switching power; reverse-battery protected; requires ≥2.2µF low-ESR ceramic bypass close to pin. |
| SW (Pin 3) | Switch node connection | Connects to inductor; carries high di/dt; internal 250Ω antiringing switch engages in DCM to suppress LC ringing. |
| GND (Pin 4) | Signal and power ground reference | Common return for all internal circuits; must be low-impedance PCB plane; ties to MSOP lead frame (no exposed pad). |
| SS (Pin 5) | Soft-start timing node | Charged by 3µA internal current source; controls ramp rate of VC to limit inrush; discharged during shutdown or UVLO. |
| VOUT (Pin 6) | Regulated power output | Delivers boosted voltage; true disconnect in shutdown (0V, 0A); requires low-ESR ceramic output capacitor near pin. |
| FB (Pin 7) | Feedback input to error amplifier | Senses output via resistor divider; 1.22V reference sets VOUT = 1.22 × (1 + R1/R2); input bias current ≤50nA minimizes divider error. |
| VC (Pin 8) | Error amplifier output | Drives compensation network (RZ, CC1, CC2) to stabilize current-mode loop; clamped internally for large-signal recovery. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated reverse-battery protection | Blocks conduction at VIN < –0.3V; draws ≤5µA reverse current - eliminates need for external back-to-back MOSFETs or diodes. |
| True output disconnect in shutdown | VOUT drops to 0V with zero load current - prevents system leakage, enables clean power sequencing in multi-rail devices. |
| 1.2MHz fixed-frequency PWM | Enables use of sub-5µH shielded inductors and 4.7µF–10µF X5R/X7R ceramics - reduces BOM count and board area vs. lower-frequency converters. |
| Current-mode control with slope compensation | Provides inherent cycle-by-cycle current limiting, simplifies compensation, and delivers excellent line/load transient response without right-half-plane zero instability. |
| Programmable soft-start | External capacitor on SS pin sets controlled output ramp time - prevents input surge and avoids brownout in shared battery rails. |
Applications
| Medical Diagnostic Sensors | Digital Camera Flash Drivers |
|---|---|
|
Use Scenario: Portable blood glucose meters and pulse oximeters powered by two AA cells require stable 5V rail for analog front-end and microcontroller, even during battery replacement. IC Role / Device Role / Timing Role: Step-up regulator with reverse-polarity immunity and zero-output shutdown - ensures safe hot-swap battery insertion and prevents sensor corruption. Use Value: Eliminates risk of reverse-current damage during field battery changes; <1µA shutdown current extends shelf life of disposable diagnostic units. |
Use Scenario: Compact digital cameras use single-cell Li-ion batteries (3.1V–4.2V) but require 5V for xenon flash charging circuits with fast turn-on. IC Role / Device Role / Timing Role: High-efficiency boost converter delivering 350mA at 5V with minimal ripple - supplies flash capacitor charge path without affecting image sensor noise floor. Use Value: 94% peak efficiency and 1.2MHz operation minimize heat and EMI near sensitive CMOS image sensors. |
| Handheld Test Instruments | Industrial Data Loggers |
|
Use Scenario: Battery-powered multimeters and oscilloscope probes operate from 1.8V–3.2V alkaline sources but require isolated 3.3V and 5V rails for ADCs and communication interfaces. IC Role / Device Role / Timing Role: Dual-rail capable boost controller with precise 1.22V reference and low-noise PWM - maintains measurement accuracy across varying battery states. Use Value: ±2.5% output regulation and <50nA FB bias current ensure stable reference for 16-bit ADCs without calibration drift. |
Use Scenario: Remote environmental loggers deployed in unattended locations use NiMH batteries and must survive polarity reversal during maintenance. IC Role / Device Role / Timing Role: Reverse-battery protected DC/DC converter powering MCU, RF transceiver, and SD card interface - guarantees system integrity during field servicing. Use Value: Integrated reverse protection eliminates discrete protection FETs, reducing component count and failure points in long-life deployments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX77818EWL+T | Higher integration: includes buck, boost, LDOs, fuel gauge; 2.5V–5.5V input; 4.5A switch current; no reverse-battery protection. | Targeted at smartphone/tablet PMIC subsystems; lacks dedicated reverse-polarity hardening for industrial handhelds. | Select MAX77818EWL+T only if multi-rail power management and battery telemetry are required - not for standalone reverse-protected boost. |
| TPS61099YFFR | Lower quiescent current (200nA shutdown); 0.7V–5.5V input; 400mA output; no reverse-battery protection; no true output disconnect. | Optimized for ultra-low-power IoT sensors; unsuitable where polarity reversal risk exists or zero-VOUT shutdown is mandatory. | Choose TPS61099YFFR for energy-harvesting or coin-cell applications - avoid where reverse-battery events are possible. |
Compared with MAX77818EWL+T and TPS61099YFFR, the LTC3499EMS8#TRPBF uniquely combines reverse-battery protection, true output disconnect, and 750mA capability in an 8-pin MSOP - making it the only validated option for ruggedized portable instrumentation requiring both safety and efficiency.
Availability
LTC3499EMS8#TRPBF is available at Aetrix Electronics and suitable for medical diagnostics, handheld test equipment, digital imaging systems, and industrial data loggers requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for LTC3499EMS8#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 full product support, datasheet archives, and application engineering for legacy Linear parts including the LTC3499 series.
The LTC3499 product line was designed specifically for battery-powered portable electronics requiring reverse-polarity resilience, high light-load efficiency, and minimal external components - targeting medical, instrumentation, and imaging markets.
FAQ
What is the key functional difference between LTC3499EMS8#TRPBF and LTC3499BEMS8#TRPBF?
The LTC3499EMS8#TRPBF features automatic Burst Mode® operation to reduce quiescent current to 20µA at light loads, improving battery life in standby. In contrast, the LTC3499BEMS8#TRPBF uses continuous switching at all loads, eliminating low-frequency output ripple but sacrificing light-load efficiency. Both share identical pinout, package, reverse-battery protection, and 1.2MHz switching frequency - the choice depends on whether priority is ultra-low IQ (LTC3499) or ripple-sensitive analog performance (LTC3499B).
Does LTC3499EMS8#TRPBF support input voltages higher than the output voltage?
Yes, the LTC3499EMS8#TRPBF supports VIN > VOUT operation by disabling the synchronous rectifier and applying VIN directly to the gate of the P-channel MOSFET. This pass-through mode maintains regulation but limits maximum output current based on thermal constraints - for example, at VIN = 4.5V and VOUT = 3.3V in the MS8 package, IOUT(MAX) ≈ 120mA at 85°C ambient. The device does not require external components to enable this mode.
What is the recommended soft-start capacitor value for LTC3499EMS8#TRPBF to achieve a 10ms ramp time?
Using the formula t(ms) = CSS(µF) × 200, a 10ms soft-start time requires CSS = 0.05µF (50nF). A standard 47nF or 56nF X7R ceramic capacitor placed between SS (Pin 5) and GND achieves this. Larger values increase ramp time linearly but may delay system wake-up; smaller values risk inrush current exceeding 2.2µF input capacitor rating.
Can LTC3499EMS8#TRPBF be used with ceramic output capacitors less than 4.7µF?
No - the LTC3499EMS8#TRPBF requires a minimum 4.7µF low-ESR ceramic output capacitor (X5R/X7R) to maintain stability and meet ripple specifications. Using smaller values risks violating the fFILTER_POLE and fRHPZ relationship, leading to potential oscillation or poor transient response. The datasheet explicitly recommends 4.7µF–10µF; 2.2µF or lower is insufficient for reliable operation across load and temperature ranges.
Is the MS8 package of LTC3499EMS8#TRPBF RoHS-compliant and lead-free?
Yes, the LTC3499EMS8#TRPBF carries the #TRPBF suffix, indicating tape-and-reel packaging with 100% matte tin (Sn) lead finish, fully compliant with RoHS Directive 2011/65/EU and JEDEC J-STD-609A Class 1. The MS8 package contains no lead, cadmium, mercury, hexavalent chromium, PBB, or PBDE - and meets Analog Devices' green material requirements per their Product Change Notice PCN-17-001.
LTC3499EMS8#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-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):
- 1.8V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 2V
- Voltage - Output (Max):
- 6V
- Current - Output:
- 750mA (Switch)
- Frequency - Switching:
- 1.2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-MSOP
LTC3499EMS8#TRPBF FAQ
1.How can I place an order for LTC3499EMS8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3499EMS8#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 LTC3499EMS8#TRPBF reliable?
The price and inventory of LTC3499EMS8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3499EMS8#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3499EMS8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3499EMS8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3499EMS8#TRPBF?
LTC3499EMS8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3499EMS8#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 LTC3499EMS8#TRPBF?
For technical support, including LTC3499EMS8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3499EMS8#TRPBF requirements.
6.How does Aetrix verify that LTC3499EMS8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3499EMS8#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 LTC3499EMS8#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3499EMS8#TRPBF?
All LTC3499EMS8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3499EMS8#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 LTC3499EMS8#TRPBF part is unused and in its original packaging.
Return procedure for LTC3499EMS8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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