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Analog Devices Inc. LTC3499BEDD#TRPBF
- Part No.:
- LTC3499BEDD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC3499BEDD#TRPBF.pdf
- Description:
- IC REG BOOST ADJ 750MA 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,481
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Product details
Overview
LTC3499BEDD#TRPBF from Analog Devices (formerly Linear Technology) is a synchronous step-up DC/DC converter with integrated reverse-battery protection, designed for low-voltage battery-powered systems. It operates from 1.8V to 5.5V input, delivers adjustable 2V–6V output at up to 750mA, and features fixed 1.2MHz switching, true output disconnect, <1µA shutdown current, and overvoltage protection. It is used in handheld instruments and digital cameras requiring robust polarity reversal immunity and high light-load efficiency.
For engineers reviewing the LTC3499BEDD#TRPBF datasheet, LTC3499BEDD#TRPBF pinout, LTC3499BEDD#TRPBF application, or LTC3499BEDD#TRPBF equivalent, key selection criteria include reverse-battery leakage (<5µA at –6V), burst-mode vs continuous-mode distinction (LTC3499B variant uses continuous switching), soft-start programmability, and DFN-8 (3mm × 3mm) thermal pad layout requirements.
Technical Context
The LTC3499BEDD#TRPBF employs current-mode PWM control with internal slope compensation, enabling stable regulation across wide load and input ranges. Its architecture integrates a P-channel and N-channel synchronous MOSFET pair (RPMOS = 0.45Ω @ 5V, RNMOS = 0.4Ω @ 5V) and a zero-current comparator to disable the rectifier below ~40mA, minimizing reverse conduction.
Unlike the LTC3499, the LTC3499B variant disables Burst Mode operation and maintains continuous 1.2MHz switching down to no-load, eliminating low-frequency output ripple but reducing light-load efficiency. Reverse-battery protection is implemented via active circuitry that limits VIN/VOUT reverse current to ≤5µA when input is at –6V, without external diodes or FETs.
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; minimum start-up voltage is 1.6V typical. |
| Output Voltage Range | 2V to 6V adjustable via FB resistor divider - enables precise rail generation (e.g., 3.3V or 5V) from low-input sources. |
| Switching Frequency | 1.2MHz (±20%) - permits use of compact 2.2µH–10µH inductors and ceramic capacitors without audible noise. |
| Max Output Current | 750mA minimum (ILIM) - ensures reliable power delivery under peak loads; derates thermally above VIN > VOUT. |
| Shutdown Current | <1µA - preserves battery life during system sleep; achieved via internal bias shutdown and true output disconnect. |
| Reverse-Battery Leakage | <5µA at –6V on VIN/VOUT/SHDN - protects battery and downstream circuitry without external components. |
| FB Reference Voltage | 1.220V ±25mV - sets output accuracy; used with external resistors to calculate VOUT = 1.22 × (1 + R1/R2). |
Pinout & Package
Package: 8-lead (3mm × 3mm × 0.75mm) plastic DFN 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 <0.2V to shut down IC; pulled >1.2V to enable; tolerates voltage above VIN/VOUT within absolute max ratings. |
| VIN (Pin 2) | Main input supply | 1.8V–5.5V source with integrated reverse-battery protection; requires ≥2.2µF low-ESR ceramic bypass capacitor. |
| SW (Pin 3) | Power switch node | Connects to inductor; internal antiringing switch (250Ω) engages in discontinuous mode to suppress 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 control time: tSS ≈ CSS(µF) × 200 ms. |
| VOUT (Pin 6) | Regulated output supply | Delivers up to 750mA; true disconnect in shutdown eliminates body-diode conduction and inrush current. |
| FB (Pin 7) | Feedback input | Senses output via resistor divider; regulates VOUT to 1.22V reference; input bias current ≤50nA minimizes divider error. |
| VC (Pin 8) | Error amplifier output | Provides loop compensation node; connects to RC network (RZ, CC1, CC2) to stabilize current-mode control loop. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated reverse-battery protection | Eliminates need for external series MOSFET or diode; limits reverse current to ≤5µA at –6V, protecting battery and load. |
| True output disconnect | Shuts off internal P-MOSFET body diode path during shutdown, ensuring VOUT = 0V and zero load current draw. |
| Continuous switching at light loads | LTC3499B variant avoids Burst Mode artifacts (e.g., low-frequency ripple), simplifying EMI filtering in noise-sensitive applications. |
| Programmable soft-start | External capacitor on SS pin controls inrush current ramp rate, preventing input voltage sag and output overshoot. |
| Overvoltage protection (OVP) | Triggers at 6.8V (400mV hysteresis) to safeguard downstream circuitry; independent of feedback loop integrity. |
Applications
| Digital Cameras | Handheld Instruments |
|---|---|
Use Scenario: Powering CCD/CMOS image sensors and analog front-ends from two AA cells (1.8V–3.2V). IC Role / Device Role / Timing Role: Step-up converter generating stable 5V rail with reverse-polarity immunity during battery swaps. Use Value: Enables safe hot-swap battery operation without risk of damage; 94% peak efficiency extends capture time per charge. |
Use Scenario: Supplying 3.3V logic and analog rails in portable multimeters or gas detectors powered by NiMH cells. IC Role / Device Role / Timing Role: Primary DC/DC regulator with true output disconnect to meet ultra-low standby current requirements. Use Value: <1µA shutdown current extends shelf life; continuous switching (LTC3499B) avoids measurement noise from Burst Mode ripple. |
| Medical Equipment | MP3 Players |
Use Scenario: Providing isolated 5V power for USB charging ports or Bluetooth modules in portable diagnostic devices. IC Role / Device Role / Timing Role: Protected boost stage interfacing directly with user-replaceable batteries subject to insertion errors. Use Value: Reverse-battery leakage <5µA prevents battery drain and device damage during incorrect installation. |
Use Scenario: Generating 5V from single Li-ion cell (3.1V–4.2V) to drive audio DACs and headphone amplifiers. IC Role / Device Role / Timing Role: High-efficiency boost converter operating in VIN > VOUT mode with thermal foldback protection. Use Value: Maintains regulation across full battery discharge curve; thermal shutdown (TSD) prevents overheating during sustained playback. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS61099YFFR | Lower quiescent current (300nA), no reverse-battery protection, 1.2MHz fixed frequency, 5.5V max input. | Not suitable where battery polarity reversal is possible; better for ultra-low-IQ coin-cell applications. | Select only if reverse protection is handled externally and sub-µA shutdown is critical. |
| MAX17222ELT+T | Includes reverse-voltage protection but requires external P-MOSFET; 1.2MHz, 5.5V input, 500mA max output. | Higher BOM count and layout complexity; lower output current capability than LTC3499BEDD#TRPBF. | Choose when cost sensitivity outweighs integration benefit and 750mA output is not required. |
Compared with TPS61099YFFR and MAX17222ELT+T, the LTC3499BEDD#TRPBF uniquely integrates reverse-battery protection, true output disconnect, and 750mA capability in a 3mm × 3mm DFN-enabling smaller, safer, and more reliable designs for consumer and medical battery-powered equipment.
Availability
LTC3499BEDD#TRPBF is available at Aetrix Electronics and suitable for digital cameras, handheld instruments, and portable medical equipment requiring stable component supply, long-term lifecycle support, and guaranteed lead-free compliance.
Supply support for LTC3499BEDD#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 precision analog and power management product lines with full technical documentation and long-term manufacturing commitment.
The LTC3499B belongs to Linear's high-efficiency, low-voltage synchronous boost converter family, engineered specifically for battery-powered portable electronics needing reverse-polarity resilience, minimal footprint, and robust thermal performance.
FAQ
What is the key functional difference between LTC3499BEDD#TRPBF and LTC3499EDD#TRPBF?
The LTC3499BEDD#TRPBF uses continuous switching mode at light loads, while the LTC3499EDD#TRPBF enters Burst Mode operation below a threshold current. This makes the LTC3499BEDD#TRPBF preferable in noise-sensitive applications like audio or precision instrumentation where low-frequency ripple must be avoided. Both share identical pinout, package, and protection features.
Does LTC3499BEDD#TRPBF require external components for reverse-battery protection?
No. The LTC3499BEDD#TRPBF integrates reverse-battery protection circuitry that limits reverse current to ≤5µA when VIN is at –6V, eliminating the need for external MOSFETs or diodes. This reduces BOM count, PCB area, and potential failure points compared to discrete protection solutions.
What is the maximum output current capability of LTC3499BEDD#TRPBF at 3.3V output from a 2.4V input?
At VIN = 2.4V and VOUT = 3.3V, the LTC3499BEDD#TRPBF can deliver up to approximately 600mA continuously, assuming adequate PCB thermal design (exposed pad soldered, multiple vias to ground plane). Derating applies above ambient temperatures of 85°C or with higher VOUT–VIN differentials.
How is soft-start time set on LTC3499BEDD#TRPBF, and what capacitor value yields ~10ms?
The LTC3499BEDD#TRPBF soft-start time is set by an external capacitor (CSS) from SS pin to GND, charged by an internal 3µA current source. Using the formula t(ms) ≈ CSS(µF) × 200, a 0.05µF (50nF) capacitor yields ~10ms soft-start duration. Larger values increase ramp time and reduce inrush stress.
Can LTC3499BEDD#TRPBF operate with input voltage higher than output voltage?
Yes. The LTC3499BEDD#TRPBF supports VIN > VOUT operation by disabling the synchronous rectifier and applying VIN directly to the P-MOSFET gate. In this mode, output current is thermally limited - e.g., ~330mA at VIN = 4.5V, VOUT = 3.3V, and TA = 85°C in the DFN package - to maintain junction temperature below 125°C.
LTC3499BEDD#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-WFDFN Exposed Pad
- 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-DFN (3x3)
LTC3499BEDD#TRPBF FAQ
1.How can I place an order for LTC3499BEDD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3499BEDD#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 LTC3499BEDD#TRPBF reliable?
The price and inventory of LTC3499BEDD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3499BEDD#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3499BEDD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3499BEDD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3499BEDD#TRPBF?
LTC3499BEDD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3499BEDD#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 LTC3499BEDD#TRPBF?
For technical support, including LTC3499BEDD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3499BEDD#TRPBF requirements.
6.How does Aetrix verify that LTC3499BEDD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3499BEDD#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 LTC3499BEDD#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3499BEDD#TRPBF?
All LTC3499BEDD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3499BEDD#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 LTC3499BEDD#TRPBF part is unused and in its original packaging.
Return procedure for LTC3499BEDD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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