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Analog Devices Inc. LTC3499EMS8#PBF
- Part No.:
- LTC3499EMS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC3499EMS8#PBF.pdf
- Description:
- IC REG BOOST ADJ 750MA 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:240
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Product details
Overview
LTC3499EMS8#PBF from Analog Devices (formerly Linear Technology) is a synchronous step-up DC/DC converter with integrated reverse-battery protection, designed for low-input-voltage battery-powered systems. It operates from 1.8V to 5.5V input, delivers up to 750mA output current, regulates adjustable output voltages from 2V to 6V at 1.2MHz fixed switching frequency, and features true output disconnect in shutdown-enabling zero load current and inrush control in handheld medical instruments and digital cameras.
For engineers reviewing the LTC3499EMS8#PBF datasheet, LTC3499EMS8#PBF pinout, LTC3499EMS8#PBF application, or LTC3499EMS8#PBF equivalent, key selection criteria include its 8-lead MSOP package, reverse-polarity protection capability, Burst Mode® operation (LTC3499 variant), sub-1µA shutdown current, and compatibility with two-cell alkaline/NiMH or single-cell Li-ion sources.
Technical Context
The LTC3499EMS8#PBF implements current-mode PWM control with internal slope compensation, enabling stable regulation and fast transient response. Its architecture integrates a P-channel high-side MOSFET and N-channel synchronous rectifier, 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 GND, limiting reverse current to <5µA. Soft-start is externally programmable via SS pin (3µA charge current), and overvoltage protection triggers at 6.8V with 400mV hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 1.8V to 5.5V - supports two alkaline/NiMH cells or one Li-ion cell without external biasing |
| Output Voltage Range | 2V to 6V - set via resistor divider on FB pin using 1.22V reference |
| Switching Frequency | 1.2MHz (±20%) - enables use of compact 2.2–10µH inductors and ceramic capacitors |
| Peak Output Current | ≥750mA - minimum guaranteed current limit ensures robust load handling under worst-case conditions |
| Shutdown Supply Current | <1µA - minimizes battery drain during system sleep or off-state |
| FB Reference Voltage | 1.220V (±25mV) - defines output accuracy and sets regulation tolerance across temperature |
| Overvoltage Threshold | 6.8V with 400mV hysteresis - protects downstream circuitry from fault-induced overvoltage |
Pinout & Package
8-lead plastic MSOP package (3.0mm × 3.0mm × 1.1mm), thermally enhanced with θJA = 160°C/W. Exposed pad not present in MS8; standard leadframe construction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SHDN (Pin 1) | Enable/disable control input | Pulled >1.2V to enable; <0.2V to enter ultra-low-power shutdown (<1µA) |
| VIN (Pin 2) | Main power input with reverse-battery protection | Accepts 1.8–5.5V; internal circuitry blocks reverse conduction down to –6V |
| SW (Pin 3) | Switch node connection | Drives external inductor; includes 250Ω antiringing switch in discontinuous mode |
| GND (Pin 4) | Signal and power ground reference | Common return for all analog and power paths; must be low-impedance PCB plane |
| SS (Pin 5) | Soft-start timing input | Charged by 3µA internal current source; capacitor value sets inrush ramp time (t ≈ CSS × 200 ms) |
| VOUT (Pin 6) | Regulated power output | Delivers up to 750mA; true disconnect isolates load during shutdown |
| FB (Pin 7) | Feedback voltage sensing input | Monitors resistive divider to maintain 1.22V at pin; sets VOUT = 1.22 × (1 + R1/R2) |
| VC (Pin 8) | Error amplifier output | Connects to compensation network (RZ, CC1, CC2) for loop stability in current-mode control |
Key Features
| Feature | Design Value |
|---|---|
| Integrated reverse-battery protection | Blocks conduction when VIN < GND, limiting reverse current to <5µA and protecting battery, IC, and load |
| Burst Mode® operation (LTC3499 only) | Reduces quiescent current to 20µA at light loads while maintaining regulation via intermittent PWM bursts |
| True output disconnect | Eliminates body-diode leakage path, enabling VOUT = 0V and zero load current during shutdown |
| Antiringing control | Activates internal 250Ω switch across inductor in DCM to suppress SW node ringing and reduce EMI |
| Programmable soft-start | External capacitor on SS pin controls inrush current ramp rate, preventing input supply sag or brownout |
Applications
| Digital Cameras | Handheld Medical Instruments |
|---|---|
Use Scenario: Powering CCD/CMOS image sensors and flash LEDs from two AA cells. IC Role / Device Role / Timing Role: Synchronous boost converter generating stable 5V rail with reverse-polarity immunity during battery replacement. Use Value: Enables safe hot-swap battery operation and extends runtime via >94% efficiency at 175mA load. |
Use Scenario: Providing isolated 3.3V or 5V supply for microcontroller, display, and sensor interfaces in portable diagnostic devices. IC Role / Device Role / Timing Role: Primary DC/DC regulator with true output disconnect ensuring zero standby current and no backfeed into depleted batteries. Use Value: Meets stringent IEC 60601 leakage and safety requirements while supporting long shelf life. |
| MP3 Players | Industrial Handheld Scanners |
Use Scenario: Boosting voltage from single Li-ion cell (3.1–4.2V) to 5V for USB audio DAC and headphone amplifier. IC Role / Device Role / Timing Role: High-frequency (1.2MHz) step-up converter minimizing solution size and EMI in compact audio enclosures. Use Value: Delivers 350mA at 5V with low-noise PWM operation, avoiding audible beat frequencies in audio signal chain. |
Use Scenario: Generating regulated 5V for barcode scanner engine and Bluetooth radio from ruggedized 2xAA battery pack. IC Role / Device Role / Timing Role: Reverse-battery protected power manager enabling field maintenance without risk of polarity damage. Use Value: Eliminates need for external reverse-protection MOSFET or diode, reducing BOM count and thermal overhead. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS610992DSER | Lower max output current (400mA), no reverse-battery protection, 1.2MHz switching, 0.7V start-up | Suitable for ultra-low-power IoT sensors but lacks polarity protection required in consumer handhelds | Select if start-up voltage <1.8V is critical and reverse protection is handled externally |
| LTC3532EMS8E#PBF | Same MS8 package, 1.2MHz, 2–5.5V output range, no Burst Mode, higher 1.2A current limit, integrated soft-start | Better for higher-current loads (>500mA) where continuous light-load operation is preferred over efficiency optimization | Choose when Burst Mode noise sensitivity is unacceptable and higher output current headroom is needed |
Compared with TPS610992DSER and LTC3532EMS8E#PBF, the LTC3499EMS8#PBF uniquely combines reverse-battery protection, true output disconnect, and Burst Mode efficiency in an MS8 footprint-making it optimal for battery-replaceable consumer electronics where safety, standby life, and compactness are co-prioritized.
Availability
LTC3499EMS8#PBF is available at Aetrix Electronics and suitable for digital cameras, handheld medical instruments, MP3 players, industrial scanners, and portable test equipment requiring stable component supply, long-term lifecycle support, and guaranteed RoHS-compliant sourcing.
Supply support for LTC3499EMS8#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 technical and manufacturing continuity for legacy Linear power products.
The LTC3499EMS8#PBF belongs to Linear's high-efficiency, low-voltage boost converter family, engineered specifically for space-constrained, battery-powered applications demanding reverse-polarity resilience and ultra-low quiescent current.
FAQ
What is the minimum input voltage required for the LTC3499EMS8#PBF to start switching?
The LTC3499EMS8#PBF has a typical minimum start-up voltage of 1.6V and a guaranteed minimum of 1.8V across temperature. Below this threshold, the device remains in UVLO and will not initiate switching-even if SHDN is asserted. This ensures reliable operation from two fresh alkaline cells (≈1.6V per cell) or partially discharged NiMH packs.
Does the LTC3499EMS8#PBF support output voltages above 5V?
Yes, the LTC3499EMS8#PBF supports output voltages from 2V to 6V, set via an external resistor divider on the FB pin using the internal 1.22V reference. For example, a 1MΩ/324kΩ divider yields 5V; scaling R1 increases VOUT linearly-up to the absolute maximum VOUT rating of 6.8V (OVP threshold).
How does reverse-battery protection work in the LTC3499EMS8#PBF?
The LTC3499EMS8#PBF uses internal comparator circuitry to detect when VIN falls below GND. Upon detection, it disables both MOSFET switches and blocks conduction paths, limiting reverse current to <5µA even at –6V input. This eliminates need for external reverse-protection components and prevents damage to the IC, battery, or downstream load.
Can the LTC3499EMS8#PBF operate with input voltage higher than output voltage?
Yes, the LTC3499EMS8#PBF supports VIN > VOUT operation by terminating switching and applying VIN directly to the gate of the P-channel MOSFET. In this mode, output current is thermally limited-e.g., ~330mA at 4.5V→3.3V in MS8 package at 85°C ambient-to prevent junction overheating due to increased conduction loss.
What is the purpose of the VC pin on the LTC3499EMS8#PBF?
The VC pin on the LTC3499EMS8#PBF is the error amplifier output. It connects to an external compensation network (typically RZ, CC1, CC2) to stabilize the current-mode control loop. Proper compensation ensures phase margin >45°, suppresses right-half-plane zero effects, and maintains regulation during load transients-critical for reliable performance across 0.1–1000mA loads.
LTC3499EMS8#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-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):
- 1.8V
- 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#PBF FAQ
1.How can I place an order for LTC3499EMS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3499EMS8#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 LTC3499EMS8#PBF reliable?
The price and inventory of LTC3499EMS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3499EMS8#PBF is usually 5 days.
3.What payment methods are accepted for LTC3499EMS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3499EMS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3499EMS8#PBF?
LTC3499EMS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3499EMS8#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 LTC3499EMS8#PBF?
For technical support, including LTC3499EMS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3499EMS8#PBF requirements.
6.How does Aetrix verify that LTC3499EMS8#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3499EMS8#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 LTC3499EMS8#PBF meets industry standards.
7.What is the process for return or replacement of LTC3499EMS8#PBF?
All LTC3499EMS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3499EMS8#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 LTC3499EMS8#PBF part is unused and in its original packaging.
Return procedure for LTC3499EMS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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