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Analog Devices Inc. LTC3499EDD#PBF
- Part No.:
- LTC3499EDD#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC3499EDD#PBF.pdf
- Description:
- IC REG BOOST ADJ 750MA 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:109
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Product details
Overview
LTC3499EDD#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 portable 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 and <1µA shutdown current - enabling reliable power management in medical instruments and handheld devices powered by two alkaline/NiMH cells.
For engineers reviewing the LTC3499EDD#PBF datasheet, LTC3499EDD#PBF pinout, LTC3499EDD#PBF application, or LTC3499EDD#PBF equivalent, this page provides verified technical context, validated pin functions, confirmed efficiency curves (up to 94% at 175mA), exact package dimensions (3mm × 3mm DFN-8 with exposed thermal pad), and real-world alternative selection guidance for reverse-polarity-protected boost conversion.
Technical Context
The LTC3499EDD#PBF implements current-mode control with internal slope compensation, enabling stable regulation across wide load and input ranges while simplifying loop compensation. Its architecture integrates a P-channel and N-channel synchronous MOSFET pair (RPMOS = 0.45Ω, RNMOS = 0.4Ω at VOUT = 5V), lossless peak-current sensing, and zero-current detection to disable the synchronous rectifier below ~40mA.
Burst Mode operation (exclusive to LTC3499, not LTC3499B) reduces quiescent current to 20µA at light loads by cycling between full PWM bursts and deep sleep, while antiringing circuitry damps SW-node ringing in discontinuous conduction mode using an internal 250Ω switch. Reverse-battery protection limits VIN/VSW reverse current to ±5µA when input is pulled to –6V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 1.8V to 5.5V - supports direct operation from two alkaline/NiMH cells (1.8V–3.2V) or single Li-ion (3.1V–4.2V). |
| Output Voltage Range | 2V to 6V adjustable via FB resistor divider - enables precise rail generation (e.g., 3.3V or 5V) without external LDO post-regulation. |
| Switching Frequency | 1.2MHz (±20%) - permits use of compact 2.2µH–10µH surface-mount inductors and ceramic capacitors ≤10µF. |
| Peak Switch Current Limit | 0.75A minimum - ensures robust overcurrent protection during startup or short-circuit events without external sensing. |
| Shutdown Supply Current | <1µA - eliminates standby drain on battery-powered systems, extending shelf life and sleep-mode duration. |
| Efficiency (Typical) | 94% at 175mA, VIN = 1.8V → VOUT = 5V - minimizes thermal stress and extends runtime in space-constrained portable designs. |
| Reverse-Battery Leakage | ±5µA at VIN = VSW = –6V - prevents battery discharge and IC damage when batteries are inserted backward. |
Pinout & Package
Package: 8-lead (3mm × 3mm × 0.75mm) plastic DFN with exposed thermal pad (Pin 9, GND). Exposed pad must be soldered 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 - compatible with logic-level microcontrollers and open-drain drivers. |
| VIN (Pin 2) | Main input supply | Accepts 1.8V–5.5V with integrated reverse-battery protection; requires ≥2.2µF low-ESR ceramic bypass capacitor placed adjacent to pin. |
| SW (Pin 3) | Switch node | Connects to inductor; carries high di/dt switching current - requires short, wide PCB trace to minimize EMI and voltage overshoot. |
| GND (Pin 4 + Exposed Pad) | Signal and power ground | Primary return path for VIN, VOUT, and SW currents; exposed pad (Pin 9) 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 × 200 ms) and discharges during shutdown. |
| VOUT (Pin 6) | Regulated output supply | Delivers up to 750mA; requires low-ESR ceramic output capacitor (4.7µF–10µF) placed adjacent to pin to suppress ripple and improve transient response. |
| FB (Pin 7) | Feedback input | Senses output voltage via resistor divider; reference voltage is 1.22V (±2.5% over temp); sets VOUT = 1.22 × (1 + R1/R2). |
| VC (Pin 8) | Error amplifier output | Connects to compensation network (RZ, CC1, CC2) to stabilize current-mode loop; clamped internally for fast large-signal recovery. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated reverse-battery protection | Eliminates need for external series MOSFET or diode, reducing BOM count and forward-drop losses while limiting reverse leakage to ±5µA. |
| True output disconnect in shutdown | Prevents body-diode conduction from VOUT to VIN, ensuring zero load current and eliminating inrush surge during power-up. |
| Automatic Burst Mode operation | Reduces input quiescent current to 20µA at light loads (e.g., sensor sleep states), significantly extending battery life in intermittent-use applications. |
| 1.2MHz fixed-frequency PWM | Enables use of miniature inductors (e.g., Coilcraft MSS5131-472MLB) and low-ESR ceramics, minimizing solution footprint to under 100 mm². |
| Antiringing control | Internally connects 250Ω resistor from VIN to SW during discontinuous mode, damping LC ringing and reducing conducted/EMI emissions. |
Applications
| Medical Equipment | Digital Cameras |
|---|---|
Use Scenario: Portable blood glucose meters powered by two AA alkaline cells requiring stable 3.3V rail for MCU and sensor interface. IC Role / Device Role / Timing Role: Synchronous boost converter providing regulated 3.3V output with reverse-battery protection to prevent accidental polarity damage during battery replacement. Use Value: Enables >500-hour shelf life (via <1µA shutdown current) and eliminates field failures from misinserted batteries - critical for FDA-compliant Class II devices. |
Use Scenario: Compact digital camera flash LED driver requiring 5V from 3.6V nominal Li-ion battery. IC Role / Device Role / Timing Role: Step-up regulator generating 5V at up to 350mA for white LED array, operating in VIN > VOUT mode when battery is fully charged. Use Value: Maintains consistent flash brightness across full battery range (3.1V–4.2V) without efficiency collapse, thanks to seamless transition between boost and pass-through modes. |
| MP3 Players | Handheld Instruments |
Use Scenario: Flash-based audio player using NAND memory requiring 3.3V I/O and 1.8V core rails, powered by two NiMH cells (2.4V nominal). IC Role / Device Role / Timing Role: Primary 3.3V supply with Burst Mode optimization to sustain >100-hour playback on rechargeable cells. Use Value: Achieves 92% efficiency at 50mA load (typical playback current), directly translating to extended runtime without increasing battery size or cost. |
Use Scenario: Battery-operated handheld multimeter needing isolated 5V rail for analog front-end and ADC reference. IC Role / Device Role / Timing Role: Reverse-polarity-protected boost converter delivering clean 5V output with <10mVpp ripple (using feedforward capacitor CFF) for precision measurement circuits. Use Value: Prevents instrument damage during field battery swaps and maintains ADC accuracy via low-noise 1.2MHz PWM operation and true output disconnect. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS61200DRCT | Fixed 3.3V/5V outputs only; no adjustable FB; 0.5A max output; no reverse-battery protection. | Requires external reverse-polarity FET for battery protection; limited to fixed-output applications. | Select when fixed output and lower cost outweigh need for adjustability and integrated protection. |
| LTC3499BEDD#PBF | Same package and pinout; continuous switching at light loads (no Burst Mode); higher light-load quiescent current (~600µA vs 20µA). | Better for noise-sensitive applications where low-frequency ripple from Burst Mode is unacceptable. | Choose when EMI compliance mandates constant-frequency operation, accepting reduced battery life in standby. |
Compared with TPS61200DRCT, LTC3499EDD#PBF offers adjustable output and built-in reverse-battery protection but requires external compensation. Compared with LTC3499BEDD#PBF, it trades higher light-load efficiency (20µA vs 600µA) for Burst Mode ripple - making it optimal for battery longevity in intermittently active devices.
Availability
LTC3499EDD#PBF is available at Aetrix Electronics and suitable for medical equipment, digital cameras, MP3 players, and handheld instruments requiring stable component supply, long-term lifecycle support, and guaranteed lead-free compliance.
Supply support for LTC3499EDD#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 legacy of high-performance power management ICs with rigorous automotive-grade qualification and long-term product stability.
The LTC3499 series was designed specifically for reverse-polarity-protected boost conversion in space-constrained, battery-powered portable electronics - emphasizing ultra-low shutdown current, small inductor compatibility, and robust fault protection.
FAQ
What is the minimum input voltage required to start up the LTC3499EDD#PBF?
The LTC3499EDD#PBF has a typical minimum start-up voltage of 1.6V and guaranteed minimum of 1.8V across the full –40°C to 85°C temperature range. This allows reliable operation from two nearly depleted alkaline or NiMH cells, and ensures functionality even under cold-temperature battery derating conditions. The LTC3499EDD#PBF maintains regulation down to 1.8V input while delivering up to 175mA at 5V output.
Does the LTC3499EDD#PBF support operation when input voltage exceeds output voltage?
Yes, the LTC3499EDD#PBF supports VIN > VOUT operation by disabling the synchronous rectifier and applying VIN directly to the gate of the P-channel MOSFET, effectively placing the device in pass-through mode. In this state, maximum output current is thermally limited - for example, 330mA at VIN = 4.5V, VOUT = 3.3V, and TA = 85°C in the DFN package. The LTC3499EDD#PBF automatically transitions between boost and pass-through modes without external intervention.
How is soft-start time programmed on the LTC3499EDD#PBF?
The soft-start time on the LTC3499EDD#PBF is set by an external capacitor (CSS) connected from Pin 5 (SS) to GND. An internal 3µA current source charges CSS, and soft-start duration is calculated as tSS (ms) ≈ CSS (µF) × 200. For example, a 0.01µF capacitor yields ~2ms ramp time. During shutdown or thermal fault, CSS discharges through a 5kΩ internal path, ensuring controlled restart. This feature directly controls inrush current into the output capacitor, protecting both the LTC3499EDD#PBF and downstream circuitry.
What is the purpose of the VC pin on the LTC3499EDD#PBF?
The VC pin (Pin 8) on the LTC3499EDD#PBF is the error amplifier output, used to connect the compensation network (typically RZ, CC1, CC2) that stabilizes the current-mode feedback loop. It provides transconductance gain (40µmhos) and features internal clamps to limit output swing, improving large-signal transient response. Unlike voltage-mode controllers, the LTC3499EDD#PBF's current-mode architecture simplifies compensation by eliminating the double-pole filter inherent in boost topologies - making VC network design predictable and robust across load and input variations.
Can the LTC3499EDD#PBF be used without the feedforward capacitor (CFF) between VOUT and FB?
Yes, the LTC3499EDD#PBF operates reliably without the optional feedforward capacitor (CFF) between VOUT and FB. CFF (10pF–220pF) is recommended only to reduce peak-to-peak output ripple and input quiescent current during Burst Mode operation - particularly beneficial in noise-sensitive applications like audio or precision analog circuits. Its omission does not affect regulation accuracy, stability, or basic functionality; the LTC3499EDD#PBF meets all specifications in the datasheet without CFF.
LTC3499EDD#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)
LTC3499EDD#PBF FAQ
1.How can I place an order for LTC3499EDD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3499EDD#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 LTC3499EDD#PBF reliable?
The price and inventory of LTC3499EDD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3499EDD#PBF is usually 5 days.
3.What payment methods are accepted for LTC3499EDD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3499EDD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3499EDD#PBF?
LTC3499EDD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3499EDD#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 LTC3499EDD#PBF?
For technical support, including LTC3499EDD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3499EDD#PBF requirements.
6.How does Aetrix verify that LTC3499EDD#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3499EDD#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 LTC3499EDD#PBF meets industry standards.
7.What is the process for return or replacement of LTC3499EDD#PBF?
All LTC3499EDD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3499EDD#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 LTC3499EDD#PBF part is unused and in its original packaging.
Return procedure for LTC3499EDD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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