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Analog Devices Inc. LTC3499BEDD#PBF
- Part No.:
- LTC3499BEDD#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC3499BEDD#PBF.pdf
- Description:
- IC REG BOOST ADJ 750MA 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:683
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Product details
Overview
LTC3499BEDD#PBF from Analog Devices (formerly Linear Technology) is a synchronous, fixed-frequency 1.2MHz step-up DC/DC converter with integrated reverse-battery protection and true output disconnect. It operates from 1.8V to 5.5V input, delivers up to 750mA output current, supports 2V–6V adjustable output voltage, and achieves up to 94% efficiency - ideal for battery-powered handheld instruments and medical devices powered by two alkaline/NiMH cells.
For engineers reviewing the LTC3499BEDD#PBF datasheet, LTC3499BEDD#PBF pinout, LTC3499BEDD#PBF application, or LTC3499BEDD#PBF equivalent, key selection criteria include its continuous-switching light-load behavior (vs. Burst Mode in LTC3499), 8-lead 3mm × 3mm DFN package with exposed thermal pad, reverse-battery leakage <5µA at –6V, and guaranteed –40°C to +85°C operation.
Technical Context
The LTC3499BEDD#PBF uses current-mode control with internal slope compensation and a 1.2MHz fixed-frequency PWM architecture, enabling stable regulation with minimal external components. Its integrated P-channel and N-channel synchronous MOSFETs feature RDS(ON) of 0.45Ω (PMOS) and 0.4Ω (NMOS) at VOUT = 5V, eliminating need for external Schottky diode.
Reverse-battery protection is implemented via internal comparator circuitry that blocks conduction when VIN is reversed, limiting reverse current to ≤5µA. True output disconnect is achieved by disabling body-diode conduction of the internal PMOS switch, ensuring zero load current and no inrush during shutdown.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 1.8V to 5.5V - supports two alkaline/NiMH cells or single Li-ion cell without external LDO pre-regulation. |
| Output Voltage Range | 2V to 6V adjustable via FB resistor divider - enables direct 3.3V or 5V rail generation from low-input sources. |
| Switching Frequency | 1.2MHz (±20%) - allows use of compact 2.2µH–10µH inductors and ceramic capacitors under 10µF. |
| Max Output Current | 750mA typical - sufficient for driving 175mA at 5V from 1.8V input or 350mA at 5V from Li-ion input. |
| Shutdown Current | <1µA - preserves battery life in long-duration standby modes without external power gating. |
| FB Reference Voltage | 1.220V ±25mV - sets output accuracy; used with external resistors to program VOUT = 1.22 × (1 + R1/R2). |
| Overvoltage Threshold | 6.8V with 400mV hysteresis - protects downstream circuitry from transient overvoltage events. |
Pinout & Package
8-lead (3mm × 3mm × 0.75mm) plastic DFN package with exposed thermal pad (Pin 9, GND). Requires soldering of exposed pad to PCB ground plane for thermal performance (θJA = 45°C/W) and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SHDN (Pin 1) | Enable/disable control input | Pulled >1.2V to enable; <0.2V to shut down IC and disconnect VOUT - enables system-level power sequencing. |
| VIN (Pin 2) | Main input supply | Reverse-battery protected input; accepts 1.8V–5.5V; requires ≥2.2µF low-ESR ceramic bypass capacitor. |
| SW (Pin 3) | Switch node | Connects to inductor; internal antiringing switch (250Ω) damps LC ringing in discontinuous mode to reduce EMI. |
| GND (Pin 4 & Exposed Pad) | Signal and power ground | Common reference for all circuits; exposed pad must be soldered to PCB ground plane for thermal and electrical performance. |
| SS (Pin 5) | Soft-start timing input | Charged by internal 3µA current source; CSS value sets inrush current ramp time: tSS ≈ CSS(µF) × 200ms. |
| VOUT (Pin 6) | Regulated output | Delivers up to 750mA; true disconnect ensures 0V output and zero load current in shutdown. |
| FB (Pin 7) | Feedback input | Senses output via resistor divider; regulates VOUT to 1.22V reference; supports 2V–6V adjustment range. |
| VC (Pin 8) | Error amplifier output | Connects to compensation network (RZ, CC1, CC2) for loop stability; clamped internally for fast transient response. |
Key Features
| Feature | Design Value |
|---|---|
| Continuous switching at light loads | LTC3499B variant avoids Burst Mode artifacts - eliminates low-frequency output ripple for noise-sensitive analog/RF circuits. |
| Integrated reverse-battery protection | Blocks conduction when VIN is reversed to –6V; limits reverse current to ≤5µA - eliminates need for external MOSFET or diode protection. |
| True output disconnect | Disables PMOS body diode path during shutdown - prevents backfeed, enables zero-VOUT and zero-load-current state. |
| Low-noise 1.2MHz PWM operation | Fixed frequency simplifies EMI filtering; antiringing circuit reduces SW node ringing without added components. |
| Overvoltage protection with hysteresis | Triggers at 6.8V with 400mV hysteresis - prevents latch-up and safeguards connected ICs during transients or feedback faults. |
Applications
| Handheld Medical Instruments | Digital Cameras |
|---|---|
Use Scenario: Portable blood glucose meters or pulse oximeters powered by two AA alkaline cells (1.8V–3.2V) requiring stable 3.3V or 5V rails. IC Role / Device Role / Timing Role: Primary boost regulator providing regulated output with reverse-battery protection and zero-quiescent shutdown. Use Value: Eliminates risk of damage from accidental battery reversal; extends battery life via <1µA shutdown current and high light-load efficiency. |
Use Scenario: Compact digital cameras using single Li-ion cell (3.1V–4.2V) to power image sensor, flash LED driver, and memory interface at 5V. IC Role / Device Role / Timing Role: Synchronous step-up converter delivering up to 350mA at 5V with continuous switching for low-noise analog supply. Use Value: Avoids Burst Mode ripple interference on sensitive analog video paths; maintains regulation even when VIN exceeds VOUT. |
| MP3 Audio Players | Industrial Handheld Testers |
Use Scenario: Battery-powered MP3 players using two NiMH cells (2.4V nominal) needing clean 5V for DAC, headphone amp, and SD card interface. IC Role / Device Role / Timing Role: High-efficiency boost converter with soft-start and output disconnect to prevent audio pop/click during power-on/off. Use Value: Soft-start (programmable via SS capacitor) controls inrush; true disconnect prevents battery drain when device is off. |
Use Scenario: Ruggedized field testers operating across –40°C to +85°C ambient, powered by replaceable alkaline batteries. IC Role / Device Role / Timing Role: Temperature-stable boost regulator with guaranteed specs over full industrial range and robust reverse-polarity tolerance. Use Value: Guaranteed operation from –40°C to +85°C; reverse-battery protection prevents field damage during battery swaps. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3499EDD#PBF | Burst Mode enabled; 20µA quiescent current in light-load sleep vs. continuous 600µA for LTC3499BEDD#PBF. | Better for ultra-low-power standby applications; introduces ~100Hz–1kHz ripple during light loads. | Select LTC3499EDD#PBF if battery life in deep sleep dominates; choose LTC3499BEDD#PBF for noise-critical analog/RF loads. |
| TPS610992DSER | Lower 200mA max output; 1.2MHz switching; no reverse-battery protection; 0.7µA shutdown current. | Targeted at lower-current IoT sensors; lacks reverse-polarity hardening required for consumer battery compartments. | Use only where reverse-battery risk is eliminated by mechanical design; not drop-in due to different pinout and missing protection. |
Compared with LTC3499EDD#PBF, LTC3499BEDD#PBF trades light-load efficiency for ripple-free output; versus TPS610992DSER, it provides higher current, integrated reverse-battery protection, and guaranteed industrial temperature operation - critical for handheld instrumentation.
Availability
LTC3499BEDD#PBF is available at Aetrix Electronics and suitable for handheld medical instruments, digital cameras, MP3 players, and industrial handheld testers requiring stable component supply with guaranteed –40°C to +85°C operation and reverse-battery resilience.
Supply support for LTC3499BEDD#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 power management portfolio with rigorous automotive and industrial qualification standards.
The LTC3499B series was designed specifically for space-constrained, battery-powered portable equipment requiring robust reverse-polarity protection, true output disconnect, and continuous switching for low-noise analog/RF subsystems.
FAQ
What is the key functional difference between LTC3499BEDD#PBF and LTC3499EDD#PBF?
The LTC3499BEDD#PBF operates in continuous switching mode at light loads, avoiding low-frequency output ripple associated with Burst Mode. In contrast, the LTC3499EDD#PBF enters Burst Mode below a threshold current, reducing quiescent current to 20µA but introducing periodic PWM bursts. This makes LTC3499BEDD#PBF preferable for noise-sensitive analog circuits where ripple must be minimized - a distinction confirmed in the Functional Block Diagram and Typical Performance Characteristics of the LTC3499/LTC3499B datasheet.
Does LTC3499BEDD#PBF support input voltages higher than the output voltage?
Yes, LTC3499BEDD#PBF supports VIN > VOUT operation by terminating switching and applying VIN directly to the gate of the internal P-channel MOSFET. This maintains regulation but limits maximum output current based on thermal constraints - e.g., 330mA at VIN = 4.5V, VOUT = 3.3V, and TA = 85°C in the DFN package. The datasheet explicitly defines this mode and provides the thermal derating equation to ensure safe operation.
How is reverse-battery protection implemented in LTC3499BEDD#PBF?
LTC3499BEDD#PBF integrates dedicated reverse-battery comparators that detect negative VIN and disable internal switches before destructive current flows. When VIN is reversed to –6V, reverse current at VOUT, VIN, and SHDN is limited to ≤5µA - verified in the Absolute Maximum Ratings and Typical Performance Characteristics (Figure G11). This eliminates need for external MOSFETs or diodes while protecting both the IC and downstream circuitry.
What is the role of the exposed thermal pad (Pin 9) on the LTC3499BEDD#PBF DFN package?
The exposed thermal pad on LTC3499BEDD#PBF is electrically and thermally connected to GND and must be soldered to a PCB ground plane. It reduces thermal resistance to 45°C/W (θJA), enabling full 750mA output capability at elevated ambient temperatures. The datasheet specifies mandatory soldering - failure to connect it degrades thermal performance and risks thermal shutdown under sustained load.
Can LTC3499BEDD#PBF be used with ceramic output capacitors smaller than 10µF?
Yes, LTC3499BEDD#PBF is optimized for small ceramic capacitors: typical designs use 4.7µF–10µF X5R/X7R types placed close to VOUT. The 1.2MHz switching frequency minimizes required capacitance; output ripple is dominated by ESR and ESL, not bulk capacitance. The datasheet's Typical Applications (Figures F04a/F05a) validate 10µF use, and Application Information confirms smaller values are viable with appropriate ESR/ESL control.
LTC3499BEDD#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-WFDFN 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):
- 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-DFN (3x3)
LTC3499BEDD#PBF FAQ
1.How can I place an order for LTC3499BEDD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3499BEDD#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 LTC3499BEDD#PBF reliable?
The price and inventory of LTC3499BEDD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3499BEDD#PBF is usually 5 days.
3.What payment methods are accepted for LTC3499BEDD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3499BEDD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3499BEDD#PBF?
LTC3499BEDD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3499BEDD#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 LTC3499BEDD#PBF?
For technical support, including LTC3499BEDD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3499BEDD#PBF requirements.
6.How does Aetrix verify that LTC3499BEDD#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3499BEDD#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 LTC3499BEDD#PBF meets industry standards.
7.What is the process for return or replacement of LTC3499BEDD#PBF?
All LTC3499BEDD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3499BEDD#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 LTC3499BEDD#PBF part is unused and in its original packaging.
Return procedure for LTC3499BEDD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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