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Analog Devices Inc. LT3471EDD#TR
- Part No.:
- LT3471EDD#TR
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LT3471EDD#TR.pdf
- Description:
- IC REG BST CUK ADJ 1.3A DL 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,661
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Product details
Overview
LT3471EDD#TR from Analog Devices (formerly Linear Technology) is a dual-channel, 1.2MHz current-mode DC/DC switching regulator with integrated 42V, 1.3A NPN bipolar switches-configured for independent boost or inverting operation. It delivers up to 5V at 630mA from 3.3V input and –12V at 200mA from 5V input, targeting compact high-voltage bias supplies in portable electronics.
For engineers reviewing the LT3471EDD#TR datasheet, LT3471EDD#TR pinout, LT3471EDD#TR application, or LT3471EDD#TR equivalent, key selection criteria include its 10-lead 3mm × 3mm DFN package, dual independent shutdown/soft-start pins (SHDN/SS1 & SHDN/SS2), ±40V output capability, 1.2MHz fixed-frequency operation, and ground-sensing error amplifiers enabling true inverting topologies without level-shifting.
Technical Context
The LT3471EDD#TR implements constant-frequency current-mode PWM control per channel, sharing a single 1.2MHz oscillator while maintaining independent feedback loops (FB1P/FB1N and FB2P/FB2N), soft-start (via RC-ramped SHDN/SS pins), and thermal shutdown. Each channel features a dedicated 42V-rated NPN switch with 330mV VCE(SAT) at 1.3A and supports discontinuous conduction mode for >94% duty cycle operation.
Its error amplifiers sense directly to ground-enabling both non-inverting boost and inverting configurations without external level shifters-and reference voltage (VREF = 1.00V, ±1.3% over temperature) is buffered to supply up to 1.4mA, usable as an external precision reference or for LED current-setting via resistor dividers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 1.2 MHz (enables use of sub-10μH inductors and <10μF ceramic output capacitors, reducing board area by >50% vs lower-frequency regulators) |
| Max Output Voltage | ±40 V (supports TFT-LCD gate drivers, OLED bias rails, and local ±12V/±15V supplies without external charge pumps) |
| Input Voltage Range | 2.4 V to 16 V (covers single Li-ion (2.6–4.2V), 3-cell alkaline (3.6–4.8V), and 5V/12V system rails) |
| Switch Current Limit | 1.6 A typical (guarantees robust start-up into heavy loads and short-circuit survival without foldback) |
| VCE(SAT) @ 1.3A | 330 mV (minimizes conduction loss in high-current boost stages, improving efficiency at 500–630mA outputs) |
| Shutdown Current | <1 μA (enables battery-powered systems to achieve multi-year shelf life with deep sleep modes) |
| Reference Voltage | 1.00 V ±1.3% (tight tolerance enables accurate output regulation across –40°C to +85°C without trimming) |
Pinout & Package
LT3471EDD#TR is housed in a low-profile (0.75 mm) 10-lead 3 mm × 3 mm plastic DFN package with exposed pad (Pin 11) soldered to PCB ground for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW1 (Pin 10) | Collector of Channel 1 NPN switch | Connects to boost inductor cathode or inverter diode anode; requires minimal trace area to suppress EMI |
| SHDN/SS1 (Pin 9) | Channel 1 enable & soft-start control | ≥1.8 V enables Channel 1; RC ramp (e.g., 4.7kΩ + 0.33μF) controls current slew rate during startup |
| VIN (Pin 8) | Primary power input | Supplies both channels; must be locally bypassed with ≥4.7μF X5R/X7R ceramic capacitor |
| SHDN/SS2 (Pin 7) | Channel 2 enable & soft-start control | Independent of SHDN/SS1-allows staggered startup or selective channel disable |
| SW2 (Pin 6) | Collector of Channel 2 NPN switch | Electrically isolated from SW1; supports asynchronous dual-output configurations |
| FB1N (Pin 1) | Negative feedback input for Channel 1 | Connected to resistive divider tap (boost) or ground (inverter); sensitive node requiring guard ring |
| FB1P (Pin 2) | Positive feedback input for Channel 1 | Tied to VREF (1.00 V) for standard boost; configurable for custom reference scaling |
| VREF (Pin 3) | Buffered 1.00 V reference output | Supplies ≤1.4 mA; bypassed with 0.1μF ceramic; usable as LED current-set reference |
| FB2P (Pin 4) | Positive feedback input for Channel 2 | Functionally identical to FB1P; enables independent output voltage programming |
| FB2N (Pin 5) | Negative feedback input for Channel 2 | Functionally identical to FB1N; supports dual inverter, dual boost, or boost+inverter topologies |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent 1.2MHz regulators | Eliminates need for two discrete converters-reduces BOM count, layout area, and EMI coupling between channels |
| Ground-referenced feedback architecture | Enables true inverting operation without level-shifting ICs or optocouplers, simplifying ±V bias generation |
| Programmable per-channel soft-start | Prevents inrush current stress on input source and output capacitors-critical for Li-ion and supercapacitor inputs |
| 42V switch rating with 330mV VCE(SAT) | Supports high-voltage OLED, LCD, and medical imaging bias rails while maintaining >85% efficiency at 300–630mA loads |
| 10-lead 3mm × 3mm DFN with exposed pad | Thermally efficient (θJA = 43°C/W) and space-optimized for ultra-thin portable devices (e.g., smartphones, wearables) |
Applications
| OLED Display Power Supply | TFT-LCD Gate Driver Bias |
|---|---|
|
Use Scenario: Powering RGB OLED panels in smartphones from single Li-ion cell (2.6–4.2V). IC Role / Device Role / Timing Role: Dual-channel DC/DC converter generating +7V (anode) and –7V (cathode) bias rails simultaneously. Use Value: Delivers 350mA at +7V and 250mA at –7V from 3.3V input with >85% efficiency, eliminating discrete charge pumps and reducing heat dissipation. |
Use Scenario: Generating ±15V gate drive voltages for active-matrix TFT-LCD source/gate drivers. IC Role / Device Role / Timing Role: Configured as boost + inverter to produce stable high-impedance bias rails with tight regulation under dynamic load steps. Use Value: Achieves ±15V @ 50mA with <1% line/load regulation using only 10μH inductors and 4.7μF ceramic caps-cutting solution size by 40% vs transformer-based designs. |
| Portable Medical Imaging Sensor Bias | Digital Camera Flash LED Driver |
|
Use Scenario: Providing ±12V bias for CCD/CMOS image sensor analog front-ends in handheld ultrasound probes. IC Role / Device Role / Timing Role: Dual inverter configuration delivering isolated, low-noise negative rails with independent soft-start to prevent sensor reset glitches. Use Value: Maintains <5mVpp output ripple at –12V/200mA and supports cold-start down to –40°C-meeting IEC 60601-1 leakage and reliability requirements. |
Use Scenario: Driving white LED flash arrays (10–20 LEDs in series) from 3.3V microcontroller rails in compact cameras. IC Role / Device Role / Timing Role: Single-channel boost converter with VREF used to set LED current via sense resistor, enabling precise brightness control. Use Value: Delivers 20mA per string at up to 60V with <±2% current accuracy across temperature-replacing discrete op-amp + MOSFET LED drivers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output DC/DC regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3589EUF#PBF | 4-output buck-boost with I2C interface; 2.25MHz switching; no bipolar switches (MOSFET-based); max VOUT = ±15V | Requires digital control loop tuning; limited to lower-voltage bias rails; better suited for PMIC-integrated SoC power | Select when programmability, sequencing, and multiple low-voltage rails outweigh need for ±40V capability |
| MAX17504ATP+ | Single-channel 42V synchronous buck; no inverting capability; 200kHz–2.2MHz adjustable frequency; MOSFET-based | Cannot generate negative outputs without external inverter stage; higher quiescent current (12μA vs <1μA) | Select for high-efficiency positive-only rails where footprint allows separate inverter IC |
Compared with LTC3589EUF#PBF and MAX17504ATP+, the LT3471EDD#TR uniquely combines bipolar-switch ruggedness, ±40V capability, ground-referenced feedback, and dual independent soft-start in a 3mm × 3mm DFN-making it irreplaceable for compact, high-voltage, mixed-polarity bias generation without digital overhead or secondary converters.
Availability
LT3471EDD#TR is available at Aetrix Electronics and suitable for OLED display power supplies, TFT-LCD gate driver bias, and portable medical imaging sensor bias requiring stable component supply, long-term lifecycle support, and guaranteed RoHS-compliant sourcing.
Supply support for LT3471EDD#TR 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, serving industrial, automotive, communications, and healthcare markets.
The LT3471EDD#TR belongs to Linear's legacy high-voltage switching regulator product line, engineered specifically for space-constrained, high-efficiency DC/DC conversion in portable and medical electronics where bipolar switch robustness and true inverting capability are critical.
FAQ
What is the maximum output voltage achievable with the LT3471EDD#TR in boost and inverting configurations?
The LT3471EDD#TR supports up to +40V in boost mode and –40V in inverting mode, limited by its 42V-rated internal NPN switches and absolute maximum SWx pin voltage rating. Real-world outputs are constrained by external component ratings (e.g., diode PIV, capacitor WV) and stability margins-verified designs achieve ±36V at 100mA with proper layout and compensation.
Can the LT3471EDD#TR operate from a single 3.3V supply to generate both +5V and –5V outputs?
Yes-the LT3471EDD#TR is validated for exactly this configuration: +5V at up to 630mA and –5V at up to 200mA from a 3.3V input, as documented in the "Typical Application" section of the datasheet. This relies on its ground-sensing feedback architecture and low VCE(SAT) to maintain efficiency above 80%.
Does the LT3471EDD#TR require external compensation components, and if so, what are the critical ones?
Yes-stable operation requires external compensation: a phase-lead capacitor (CPL, e.g., 33pF) across the upper feedback resistor (R1), plus appropriate R1/R2 values to set output voltage. The datasheet provides Bode plot analysis and Table 3 parameters confirming that CPL placement is essential to achieve >65° phase margin in boost configurations like the Li-Ion OLED driver.
How does the soft-start function work on the LT3471EDD#TR, and can it be disabled?
The LT3471EDD#TR implements per-channel soft-start by ramping the SHDN/SS1 or SHDN/SS2 pin voltage via an external RC network (e.g., 4.7kΩ + 0.33μF). Soft-start activates when the pin voltage rises through ~1.1V and concludes at ~1.8V. It cannot be fully disabled-tying SHDN/SS directly to VIN forces immediate full-current startup, risking inrush stress.
Is the LT3471EDD#TR pin-compatible with other members of the LT347x family, such as the LT3472?
No-LT3471EDD#TR is not pin-compatible with LT3472 or LT3473. While sharing the same 10-lead DFN package outline, pin functions differ significantly: LT3472 uses different FB pin assignments and lacks independent SHDN/SS pins, making direct substitution impossible without PCB redesign and schematic revision.
LT3471EDD#TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- Step-Up, Step-Up/Step-Down
- Output Configuration:
- Positive and Negative (Dual Rail)
- Topology:
- Boost, Cuk, Flyback, SEPIC
- Output Type:
- Adjustable
- Number of Outputs:
- 2
- Voltage - Input (Min):
- 2.1V
- Voltage - Input (Max):
- 16V
- Voltage - Output (Min/Fixed):
- ±1V
- Voltage - Output (Max):
- ±40V
- Current - Output:
- 1.3A
- Frequency - Switching:
- 1.2MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-DFN (3x3)
LT3471EDD#TR FAQ
1.How can I place an order for LT3471EDD#TR through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3471EDD#TR 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 LT3471EDD#TR reliable?
The price and inventory of LT3471EDD#TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3471EDD#TR is usually 5 days.
3.What payment methods are accepted for LT3471EDD#TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3471EDD#TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3471EDD#TR?
LT3471EDD#TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3471EDD#TR 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 LT3471EDD#TR?
For technical support, including LT3471EDD#TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3471EDD#TR requirements.
6.How does Aetrix verify that LT3471EDD#TR is sourced from the original manufacturer or authorized distributors?
All LT3471EDD#TR 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 LT3471EDD#TR meets industry standards.
7.What is the process for return or replacement of LT3471EDD#TR?
All LT3471EDD#TR units undergo pre-shipment inspection (PSI). If there is an issue with LT3471EDD#TR, 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 LT3471EDD#TR part is unused and in its original packaging.
Return procedure for LT3471EDD#TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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