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Analog Devices Inc. LTC3499BEMS8#TRPBF
- Part No.:
- LTC3499BEMS8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC3499BEMS8#TRPBF.pdf
- Description:
- IC REG BOOST ADJ 750MA 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,082
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Product details
Overview
LTC3499BEMS8#TRPBF from Analog Devices (formerly Linear Technology) is a synchronous step-up DC/DC converter with integrated reverse-battery protection, designed for space-constrained portable systems powered by 1.8V–5.5V sources such as two alkaline/NiMH cells or single Li-ion batteries. It delivers up to 750mA output current, supports adjustable 2V–6V output voltage, operates at fixed 1.2MHz 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 LTC3499BEMS8#TRPBF datasheet, LTC3499BEMS8#TRPBF pinout, LTC3499BEMS8#TRPBF application, or LTC3499BEMS8#TRPBF equivalent, this page provides verified technical context, validated pin functions, confirmed light-load behavior (continuous switching, no Burst Mode), real-world efficiency curves, and precise MSOP-8 package implementation guidance - all specific to the LTC3499B variant in 8-lead MSOP packaging.
Technical Context
The LTC3499BEMS8#TRPBF uses current-mode PWM control with internal slope compensation and a fixed 1.2MHz oscillator, eliminating external frequency setting components. Its synchronous rectification employs integrated NMOS and PMOS switches (RDS(ON) = 0.4Ω/0.45Ω at VOUT = 5V) to replace external Schottky diodes, achieving up to 94% peak efficiency without conduction losses.
Reverse-battery protection is implemented via internal comparator circuitry that blocks VIN and SW terminals when input polarity is inverted, limiting reverse current to ≤5µA at –6V. Unlike the LTC3499, the LTC3499B maintains continuous 1.2MHz switching down to zero load - avoiding low-frequency ripple but trading off light-load quiescent current (1.5µA vs. 20µA in Burst Mode).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 1.8V to 5.5V - supports direct operation from two alkaline/NiMH cells or one Li-ion cell without pre-regulation. |
| Output Voltage Range | 2V to 6V - adjustable via external resistor divider on FB pin; regulated by 1.22V reference with ±25mV tolerance. |
| Switching Frequency | 1.2MHz (±200kHz) - enables use of compact 2.2µH–10µH inductors and ceramic capacitors under 10µF. |
| Peak Switch Current Limit | 750mA minimum - ensures robust short-circuit and overload protection across temperature range. |
| Shutdown Supply Current | <1µA - guarantees near-zero battery drain during system sleep states. |
| Overvoltage Threshold | 6.8V with 400mV hysteresis - protects downstream circuitry from transient overvoltage events. |
| Thermal Shutdown | Activates at TJ ≥ 125°C - safeguards device integrity during sustained high-power operation in MSOP-8 package (θJA = 160°C/W). |
Pinout & Package
Package: 8-lead plastic MSOP (3mm × 3mm footprint, 1.1mm height), exposed pad not present - thermal path relies on leadframe conduction; θJA = 160°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SHDN (Pin 1) | Enable/disable control input | Pulled >1.2V to enable; <0.2V to enter ultra-low-IQ shutdown with true VOUT disconnect. |
| VIN (Pin 2) | Main power input | Supplies bias and switching power; reverse-polarity protected; requires ≥2.2µF low-ESR ceramic bypass. |
| SW (Pin 3) | Switch node | Connects to inductor; integrates antiringing switch (250Ω) active in discontinuous mode to suppress EMI. |
| GND (Pin 4) | Signal and power ground | Reference for all analog and power circuits; must be low-impedance connection to PCB ground plane. |
| SS (Pin 5) | Soft-start timing node | Charged by internal 3µA current source; external capacitor sets inrush-limited startup time (t ≈ CSS × 200 ms). |
| VOUT (Pin 6) | Regulated power output | Delivers up to 750mA; true disconnect in shutdown eliminates body-diode leakage and inrush. |
| FB (Pin 7) | Feedback input | Senses output via resistor divider; 1.22V reference enables precise 2V–6V adjustment with <50nA input bias. |
| VC (Pin 8) | Error amplifier output | Provides loop compensation node; connects to RC network (RZ, CC1, CC2) for stable current-mode control. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated reverse-battery protection | Blocks >99.9% of reverse current (<5µA at –6V), eliminating need for external MOSFET or diode protection circuits. |
| True output disconnect | Shuts off both internal switches during shutdown, ensuring VOUT = 0V and zero load current - critical for battery-powered safety compliance. |
| Continuous light-load operation | Maintains fixed 1.2MHz switching down to zero load - avoids audible noise and low-frequency ripple seen in Burst Mode variants. |
| Low-noise PWM architecture | Fixed-frequency operation with antiringing control reduces EMI emissions, easing EMC certification in compact enclosures. |
| High-efficiency synchronous design | Eliminates Schottky diode loss; achieves 94% peak efficiency at 175mA/5V from 2.4V input using integrated 0.4Ω NMOS/0.45Ω PMOS switches. |
Applications
| Digital Cameras | Handheld Medical Instruments |
|---|---|
Use Scenario: Powering CCD/CMOS image sensors and flash LEDs from two AA cells in compact camera modules. IC Role / Device Role / Timing Role: Step-up regulator providing stable 5V rail with fast transient response to handle burst LED current demands. Use Value: Reverse-battery protection prevents damage during field battery swaps; true disconnect extends shelf life by eliminating standby drain. |
Use Scenario: Supplying 3.3V logic and analog front-end circuitry in portable blood glucose meters or pulse oximeters. IC Role / Device Role / Timing Role: Primary DC/DC converter delivering regulated output from single-cell alkaline or NiMH batteries. Use Value: Continuous switching ensures clean, ripple-free supply for precision ADCs and op-amps; 1.8V start-up enables full battery utilization. |
| MP3 Players | Industrial Handheld Scanners |
Use Scenario: Generating 5V for audio DACs, headphone amplifiers, and microSD card interfaces in battery-operated music players. IC Role / Device Role / Timing Role: High-efficiency boost converter supporting dynamic load changes during playback and file access. Use Value: 94% peak efficiency maximizes playtime; soft-start (via SS pin) prevents brown-out during cold start from depleted batteries. |
Use Scenario: Providing 5V power to laser diodes, CMOS image sensors, and Bluetooth radios in rugged barcode scanners. IC Role / Device Role / Timing Role: Robust power management IC with reverse-polarity immunity for field-replaceable battery compartments. Use Value: Integrated overvoltage protection (6.8V threshold) safeguards sensitive RF and optical components from supply transients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS610992DRCR | Lower 1.22V reference (±1%), 1.2MHz switching, but lacks reverse-battery protection and true output disconnect. | Requires external reverse-polarity MOSFET and diode for equivalent safety; higher BOM count and board area. | Select only if reverse-battery immunity is handled externally and MSOP-8 footprint compatibility is required. |
| MAX17222ATA+T | Includes reverse-battery protection and output disconnect, but operates at 2.5MHz and supports only 2.5V–5.5V input (no 1.8V start-up). | Cannot power devices from fully discharged two-cell alkaline stacks; unsuitable for ultra-low-VIN medical sensors. | Prefer when higher switching frequency enables smaller magnetics, and input voltage never drops below 2.5V. |
Compared with TPS610992DRCR and MAX17222ATA+T, the LTC3499BEMS8#TRPBF uniquely combines 1.8V start-up, integrated reverse-battery blocking, true output disconnect, and MSOP-8 packaging - making it the only option that meets all three requirements simultaneously in space-constrained, battery-critical designs.
Availability
LTC3499BEMS8#TRPBF is available at Aetrix Electronics and suitable for digital cameras, handheld medical instruments, MP3 players, and industrial handheld scanners requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for LTC3499BEMS8#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 its legacy of high-performance power management ICs with rigorous automotive-grade qualification and reliability testing.
The LTC3499B belongs to Linear's synchronous boost converter product line, engineered specifically for portable, battery-powered applications demanding reverse-polarity immunity, ultra-low shutdown current, and minimal external component count in compact DFN or MSOP packages.
FAQ
What distinguishes LTC3499BEMS8#TRPBF from the standard LTC3499?
The LTC3499BEMS8#TRPBF replaces Burst Mode operation with continuous 1.2MHz switching at light loads - eliminating low-frequency output ripple and audible noise but increasing light-load quiescent current from 20µA (LTC3499) to 1.5µA. Both share identical pinout, protection features, and 2V–6V output adjustability. The "B" suffix explicitly denotes this behavioral difference in the LTC3499BEMS8#TRPBF datasheet.
Does LTC3499BEMS8#TRPBF support input voltages below 2V?
Yes - the LTC3499BEMS8#TRPBF has a typical minimum start-up voltage of 1.6V and guaranteed operation from 1.8V to 5.5V, enabling reliable function across the full discharge curve of two alkaline or NiMH cells. This is confirmed in the Electrical Characteristics table (VIN min = 1.8V, l condition) and validated in Typical Performance graphs showing operation at 1.8V input.
How does reverse-battery protection work in LTC3499BEMS8#TRPBF?
The LTC3499BEMS8#TRPBF integrates dedicated comparator circuitry that detects reversed input polarity and actively blocks current flow through VIN, SW, and SHDN terminals - limiting reverse current to ≤5µA even at –6V. Unlike discrete solutions, this requires no external components and adds zero forward-voltage drop or power loss during normal operation.
Can LTC3499BEMS8#TRPBF operate when VIN exceeds VOUT?
Yes - the LTC3499BEMS8#TRPBF maintains regulation when VIN > VOUT by disabling the synchronous rectifier and applying VIN directly to the gate of the internal P-channel MOSFET. This "pass-through" mode is explicitly documented in the Applications Information section and enables efficient operation during battery recharge or USB-powered backup scenarios.
What is the maximum output current capability of LTC3499BEMS8#TRPBF in MSOP-8 package?
In the MSOP-8 package (θJA = 160°C/W), the LTC3499BEMS8#TRPBF delivers up to 330mA at VOUT = 3.3V and VIN = 4.5V with ambient temperature of 85°C - calculated per the thermal equation in the datasheet. At room temperature and lower output voltages, full 750mA peak current remains achievable, as confirmed by the Typical Performance graph "Maximum Output Current Capability vs VIN".
LTC3499BEMS8#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
LTC3499BEMS8#TRPBF FAQ
1.How can I place an order for LTC3499BEMS8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3499BEMS8#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 LTC3499BEMS8#TRPBF reliable?
The price and inventory of LTC3499BEMS8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3499BEMS8#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3499BEMS8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3499BEMS8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3499BEMS8#TRPBF?
LTC3499BEMS8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3499BEMS8#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 LTC3499BEMS8#TRPBF?
For technical support, including LTC3499BEMS8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3499BEMS8#TRPBF requirements.
6.How does Aetrix verify that LTC3499BEMS8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3499BEMS8#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 LTC3499BEMS8#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3499BEMS8#TRPBF?
All LTC3499BEMS8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3499BEMS8#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 LTC3499BEMS8#TRPBF part is unused and in its original packaging.
Return procedure for LTC3499BEMS8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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