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Analog Devices Inc. LTC3499EDD#TRPBF
- Part No.:
- LTC3499EDD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC3499EDD#TRPBF.pdf
- Description:
- IC REG BOOST ADJ 750MA 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,345
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Product details
Overview
LTC3499EDD#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 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. It is widely deployed in handheld medical instruments powered by two AA cells.
For engineers reviewing the LTC3499EDD#TRPBF datasheet, LTC3499EDD#TRPBF pinout, LTC3499EDD#TRPBF application, or LTC3499EDD#TRPBF equivalent, key selection criteria include its 1.22V FB reference accuracy, <1µA shutdown supply current, 750mA current limit, reverse-battery leakage <5µA at –6V, and Burst Mode operation for ultra-low-light-load efficiency.
Technical Context
The LTC3499EDD#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 high-side switch and N-channel synchronous rectifier, eliminating external diode losses and supporting true output disconnect via body-diode blocking.
Reverse-battery protection is implemented through dedicated comparator circuitry that disables both switches when VIN falls below GND, limiting reverse current to <5µA. Burst Mode operation (exclusive to LTC3499, not LTC3499B) dynamically gates the oscillator and control blocks, reducing quiescent current to 20µA at light loads while maintaining 1% output regulation tolerance.
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 without external LDO pre-regulation |
| Output Voltage Range | 2V to 6V adjustable via resistor divider - enables direct 3.3V or 5V rail generation from low-VIN sources |
| Switching Frequency | 1.2MHz ±20% - permits use of compact 2.2–10µH inductors and ceramic capacitors ≤10µF |
| Peak Switch Current Limit | 750mA minimum - sets maximum deliverable output current under worst-case thermal conditions |
| FB Reference Voltage | 1.220V ±25mV - defines output setpoint accuracy; used with R1/R2 divider to calculate VOUT = 1.22 × (1 + R1/R2) |
| Shutdown Supply Current | <1µA - ensures negligible battery drain during system sleep or off-state |
| Reverse-Battery Leakage | <5µA at VIN = –6V - prevents battery discharge and protects downstream circuitry during polarity reversal |
Pinout & Package
Package: 8-lead (3mm × 3mm × 0.75mm) plastic DFN with exposed thermal pad (Pin 9), RoHS-compliant, rated for –40°C to +85°C ambient operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SHDN (Pin 1) | Enable/disable control input | Pulled >1.2V to enable; <0.2V to enter shutdown with true output disconnect and <1µA VIN current |
| VIN (Pin 2) | Main power input with reverse protection | Accepts 1.8–5.5V; internal PMOS/NMOS structure blocks reverse current and provides UVLO at ~1.6V |
| SW (Pin 3) | Switch node connection | Drives external inductor; includes 250Ω antiringing switch to damp LC resonance in discontinuous mode |
| GND (Pins 4 & 9) | Signal and power ground | Exposed pad (Pin 9) must be soldered to PCB ground plane for thermal performance (θJA = 45°C/W) |
| SS (Pin 5) | Soft-start timing node | Charged by internal 3µA source; CSS value sets inrush control time: t(ms) = CSS(µF) × 200 |
| VOUT (Pin 6) | Regulated power output | Delivers up to 750mA; true disconnect isolates load during shutdown - no body-diode conduction |
| FB (Pin 7) | Feedback input to error amplifier | Compares divided VOUT against 1.22V reference; sets output voltage with ±25mV tolerance over temperature |
| VC (Pin 8) | Error amplifier output | Connects to RC compensation network (RZ, CC1, CC2) to stabilize current-mode loop and suppress RHP zero effects |
Key Features
| Feature | Design Value |
|---|---|
| Integrated reverse-battery protection | Blocks conduction when VIN < GND, limiting reverse current to <5µA - eliminates need for external MOSFET or diode |
| True output disconnect in shutdown | Zero VOUT and zero load current achieved by disabling both internal switches - prevents backfeed and enables safe hot-swap |
| Burst Mode operation | Reduces VIN quiescent current to 20µA at light loads while maintaining ±1% output regulation - extends battery life in standby |
| 1.2MHz fixed-frequency PWM | Enables use of small 4.7µH inductors and 10µF X5R/X7R ceramic capacitors - minimizes solution footprint and EMI |
| Overvoltage protection (OVP) | Triggers at 6.8V with 400mV hysteresis - latches off SW until reset by SHDN toggle or VIN cycle |
Applications
| Handheld Medical Instruments | Digital Cameras |
|---|---|
Use Scenario: Portable blood glucose meters or pulse oximeters powered by two AA alkaline cells (1.8–3.2V). IC Role / Device Role / Timing Role: Primary 5V boost regulator delivering 175mA to CMOS image sensor and microcontroller. Use Value: Reverse-battery protection prevents damage if batteries are inserted backward; Burst Mode extends battery life during idle periods between measurements. |
Use Scenario: Compact digital still cameras using single Li-ion cell (3.1–4.2V) to generate 5V for flash LED driver and SD card interface. IC Role / Device Role / Timing Role: Synchronous boost converter supplying regulated 5V at up to 350mA with minimal ripple. Use Value: 1.2MHz operation allows tiny 4.7µH inductor and 10µF ceramic output cap; true disconnect avoids SD card corruption during power-off. |
| MP3 Players | Industrial Handheld Testers |
Use Scenario: Battery-powered audio players using two NiMH cells (2.4V nominal) to power 3.3V DSP and OLED display. IC Role / Device Role / Timing Role: Adjustable-output boost IC generating 3.3V from variable input, with soft-start to prevent inrush into large display capacitance. Use Value: SS pin programmability (via 0.01µF cap) limits inrush to <500mA; 94% peak efficiency preserves runtime during playback. |
Use Scenario: Ruggedized field testers operating from 2xAA or 2xAAA cells in harsh environments where battery reversal is a risk. IC Role / Device Role / Timing Role: Protected power supply ensuring continuous 5V output even after accidental reverse insertion. Use Value: <5µA reverse-battery current prevents cell depletion and protects sensitive analog front-end circuitry from latch-up. |
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 5V output only; no adjustable FB; 0.7A current limit; no reverse-battery protection | Suitable for cost-sensitive 5V-only designs without polarity-reversal risk | Select when output voltage is fixed and reverse protection is handled externally |
| MAX17064ETA+ | Adjustable 2.5–5.5V output; 1.2MHz; 0.8A current limit; includes integrated OVP but no reverse-battery circuitry | Requires external PMOS reverse-protection FET; higher IQ (25µA) in shutdown | Choose when higher output current is needed and board space allows discrete protection |
Compared with TPS61200DRCT and MAX17064ETA+, the LTC3499EDD#TRPBF uniquely integrates reverse-battery protection and true output disconnect in a 3mm × 3mm DFN, making it optimal for space-constrained, battery-reversal-prone portable devices requiring adjustable output and sub-1µA shutdown current.
Availability
LTC3499EDD#TRPBF is available at Aetrix Electronics and suitable for handheld medical instruments, digital cameras, MP3 players, and industrial handheld testers requiring stable component supply, long-term lifecycle support, and guaranteed RoHS compliance.
Supply support for LTC3499EDD#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, Inc. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors.
The LTC3499 product line was designed specifically for ultra-low-input-voltage, high-efficiency boost conversion in portable battery-powered equipment - emphasizing reverse-polarity resilience, minimal external components, and seamless light-load efficiency management.
FAQ
What is the minimum input voltage required to start up the LTC3499EDD#TRPBF?
The LTC3499EDD#TRPBF has a typical minimum start-up voltage of 1.6V and guaranteed minimum of 1.8V across temperature. Below 1.8V, the device will not initiate switching; this threshold ensures reliable operation from two fresh alkaline or NiMH cells, even as they discharge.
Does the LTC3499EDD#TRPBF support output voltages above 5V?
Yes, the LTC3499EDD#TRPBF supports an adjustable output range from 2V to 6V via the FB pin and external resistor divider. The 6V upper limit is enforced by internal overvoltage protection, which triggers at 6.8V with 400mV hysteresis to safeguard downstream circuitry.
How does reverse-battery protection work on the LTC3499EDD#TRPBF?
The LTC3499EDD#TRPBF uses internal comparator circuitry to detect when VIN falls below GND. Upon detection, both internal PMOS and NMOS switches are disabled, limiting reverse current to <5µA at –6V - protecting the battery, IC, and load without external components.
What is the purpose of the SS pin on the LTC3499EDD#TRPBF?
The SS (soft-start) pin on the LTC3499EDD#TRPBF controls inrush current during startup. An internal 3µA current source charges an external capacitor (CSS) connected to ground; the resulting ramp time determines how gradually VOUT rises - preventing input surge and output overshoot into large capacitive loads.
Is the LTC3499EDD#TRPBF pin-compatible with the LTC3499B variant?
No, the LTC3499EDD#TRPBF and LTC3499BEDD#TRPBF share identical pinout and package (8-lead DFN), but differ functionally: the LTC3499EDD#TRPBF includes Burst Mode for ultra-low-IQ light-load operation, while the LTC3499BEDD#TRPBF uses continuous switching - resulting in lower noise but reduced light-load efficiency.
LTC3499EDD#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)
LTC3499EDD#TRPBF FAQ
1.How can I place an order for LTC3499EDD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3499EDD#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 LTC3499EDD#TRPBF reliable?
The price and inventory of LTC3499EDD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3499EDD#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3499EDD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3499EDD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3499EDD#TRPBF?
LTC3499EDD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3499EDD#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 LTC3499EDD#TRPBF?
For technical support, including LTC3499EDD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3499EDD#TRPBF requirements.
6.How does Aetrix verify that LTC3499EDD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3499EDD#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 LTC3499EDD#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3499EDD#TRPBF?
All LTC3499EDD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3499EDD#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 LTC3499EDD#TRPBF part is unused and in its original packaging.
Return procedure for LTC3499EDD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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