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Analog Devices Inc. LT3471EDD
- Part No.:
- LT3471EDD
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LT3471EDD.pdf
- Description:
- IC REG BST CUK ADJ 1.3A DL 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,285
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Product details
Overview
LT3471EDD from Analog Devices (formerly Linear Technology) is a dual-channel, 1.2MHz, 42V bipolar switching regulator IC with independent boost and inverting capability. It integrates two 1.3A NPN power switches, 1.00V reference, error amplifiers sensing to ground, and programmable soft-start. It delivers 5V at 630mA from 3.3V input or –12V at 200mA from 5V input for OLED bias and portable power rails.
For engineers reviewing the LT3471EDD datasheet, LT3471EDD pinout, LT3471EDD application, or LT3471EDD equivalent, this page provides verified functional identity, validated 10-pin DFN package mapping, confirmed dual-boost/inverter topology support, exact VCESAT (330mV @ 1.3A), and real-world efficiency data across Li-ion input ranges (2.6V–4.2V).
Technical Context
The LT3471EDD employs constant-frequency current-mode PWM control with shared 1.2MHz oscillator and independent error amplifiers per channel, enabling synchronized yet individually enabled operation. Each channel supports noninverting boost, inverting, or SEPIC topologies via configurable feedback connections (FB1P/FB1N, FB2P/FB2N) and internal 1.00V reference.
Its bipolar NPN switches feature low VCESAT (250mV typ. @ 0.5A), rated for 42V collector-emitter voltage, and integrated current limiting (1.6A typ.) with thermal shutdown. Soft-start is implemented per channel via external RC ramp on SHDN/SS pins (e.g., 4.7kΩ + 0.33μF), controlling peak switch current rise rate.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 1.2 MHz - enables use of compact 2.2–10 μH inductors and low-profile ceramic capacitors. |
| Max Output Voltage | ±40 V - supports high-voltage OLED bias, TFT-LCD supplies, and dual-rail local power generation. |
| Input Voltage Range | 2.4 V to 16 V - compatible with single Li-ion (2.6–4.2 V), multi-cell alkaline, and 5 V/12 V system rails. |
| Switch Current Limit | 1.6 A typical - ensures robust overcurrent protection without external sensing components. |
| Reference Voltage | 1.00 V ±1.3% - precision trimmed bandgap reference used directly for feedback or LED current setting. |
| Shutdown Current | <1 μA - minimizes battery drain in always-on portable systems during sleep mode. |
| Duty Cycle Range | 15% to 94% - supports wide output/input voltage ratios in boost and inverting configurations. |
Pinout & Package
LT3471EDD is housed in a low-profile (0.75 mm height), thermally enhanced 10-lead 3 mm × 3 mm plastic DFN package with exposed pad (Pin 11) soldered to PCB ground for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW1 (Pin 10) | Collector of Channel 1 NPN switch | Connects to inductor/diode node; requires minimal trace area to reduce EMI and switching losses. |
| SHDN/SS1 (Pin 9) | Channel 1 enable & soft-start control | ≥1.8 V enables Channel 1; RC ramp controls startup current slew rate; grounded disables. |
| VIN (Pin 8) | Main input supply rail | Accepts 2.4–16 V; must be locally bypassed with ≥4.7 μF ceramic capacitor near pin. |
| SHDN/SS2 (Pin 7) | Channel 2 enable & soft-start control | Independent enable/disable and soft-start for Channel 2; identical behavior to Pin 9. |
| SW2 (Pin 6) | Collector of Channel 2 NPN switch | Second high-current switching node; layout symmetry with SW1 critical for noise reduction. |
| FB1N (Pin 1) | Negative feedback input for Channel 1 | Connects to resistive divider tap in boost mode; tied to GND in inverting topologies. |
| FB1P (Pin 2) | Positive feedback input for Channel 1 | Tied to VREF (1.00 V) or divided reference; sets regulation point via error amplifier. |
| VREF (Pin 3) | 1.00 V buffered reference output | Supplies up to 1.4 mA; requires 0.01–1 μF ceramic bypass; usable as external reference or soft-start source. |
| FB2P (Pin 4) | Positive feedback input for Channel 2 | Functionally identical to FB1P; enables independent output voltage programming per channel. |
| FB2N (Pin 5) | Negative feedback input for Channel 2 | Functionally identical to FB1N; supports separate topology selection (boost/invert) per channel. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent switching channels | Enables simultaneous generation of positive and negative rails (e.g., +7 V and –7 V) from single Li-ion input without cross-regulation issues. |
| 1.2 MHz fixed-frequency operation | Reduces EMI fundamental frequency and allows use of sub-3 mm inductors, shrinking total solution size by >40% vs. 500 kHz alternatives. |
| Low VCE(SAT) bipolar switches | 330 mV at 1.3 A minimizes conduction loss in high-current boost paths, improving efficiency at 3.3 V → 5 V conversion (≥85% at 630 mA). |
| Per-channel soft-start with external RC | Prevents inrush current stress on input capacitors and diodes-critical for reliability in >30 V output applications like xDSL or medical imaging supplies. |
| Ground-sensing error amplifiers | Supports direct feedback from output in inverting topologies without level-shifting circuitry, simplifying design of local ±5 V/±12 V supplies. |
Applications
| Organic LED (OLED) Bias Supply | Digital Camera Power Management |
|---|---|
Use Scenario: Generating stable ±7 V rails from a 3.3 V Li-ion battery to drive OLED display panels in smartphones and wearables. IC Role / Device Role / Timing Role: Dual-channel DC/DC converter providing regulated positive and negative bias voltages with independent soft-start and shutdown control per rail. Use Value: Achieves >80% efficiency at 350 mA (VOUT1 = +7 V) and 250 mA (VOUT2 = –7 V) while maintaining <1 μA quiescent current in shutdown-extending battery life. | Use Scenario: Powering CCD/CMOS image sensors and flash LEDs in compact digital cameras requiring isolated ±5 V and 12 V supplies. IC Role / Device Role / Timing Role: Configured as one boost (5 V @ 510 mA) and one inverter (–12 V @ 200 mA) from 5 V input, with fast transient response for burst-mode operation. Use Value: Delivers precise voltage regulation under dynamic load steps (e.g., flash discharge), with <200 mV output deviation due to current-mode control architecture. |
| TFT-LCD Panel Bias Generation | Medical Diagnostic Equipment Power |
Use Scenario: Providing VON (+15 V) and VOFF (–10 V) gate drive voltages for active-matrix LCD panels in industrial HMIs and automotive displays. IC Role / Device Role / Timing Role: Two independent boost converters operating in phase, each configured with dedicated feedback dividers and soft-start timing. Use Value: Supports wide input range (2.4–16 V) to accommodate varying vehicle battery conditions, with guaranteed 94% max duty cycle enabling high step-up ratios. | Use Scenario: Generating isolated ±12 V analog front-end supplies for portable ultrasound or ECG devices powered by rechargeable batteries. IC Role / Device Role / Timing Role: Dual inverter configuration delivering clean, low-noise negative rails with minimized EMI through synchronized 1.2 MHz switching and optimized layout guidance. Use Value: Meets stringent medical EMC requirements via controlled slew rates, exposed-pad thermal path, and recommended multilayer PCB grounding per datasheet Layout Hints. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output switching regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3589-2 | Monolithic 4-output buck-boost PMIC with I2C interface; lower max VOUT (5.5 V); no bipolar switches | Better suited for low-voltage, digitally controlled multi-rail systems (e.g., FPGA core/I/O); not viable for ±40 V OLED bias | Select LTC3589-2 only when digital programmability and sub-6 V outputs are required; LT3471EDD remains optimal for high-voltage analog bias rails. |
| MAX17504 | Single-channel 60 V synchronous buck controller; external MOSFETs; no inverting capability | Requires discrete components for dual-rail generation; higher BOM count and layout complexity for ±12 V solutions | Choose MAX17504 for high-efficiency, high-current (>2 A) single-rail conversion; LT3471EDD offers integrated dual-channel simplicity for space-constrained bias supplies. |
Compared with LTC3589-2 and MAX17504, the LT3471EDD uniquely combines bipolar 42 V switches, ground-referenced feedback, and dual independent soft-start in a 3 mm × 3 mm DFN-enabling compact, high-voltage dual-rail generation without external controllers or level shifters.
Availability
LT3471EDD is available at Aetrix Electronics and suitable for OLED display bias, portable medical diagnostics, and TFT-LCD panel power requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for LT3471EDD 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) is a global leader in high-performance analog, mixed-signal, and power management semiconductors.
The LT3471EDD belongs to Linear's legacy high-voltage switching regulator product line, designed specifically for compact, efficient dual-rail power conversion in portable and space-constrained applications where bipolar switch performance and integrated feedback architecture deliver system-level size and efficiency advantages.
FAQ
What is the maximum output voltage achievable with the LT3471EDD in boost configuration?
The LT3471EDD supports up to +40 V output in boost mode, as its internal NPN switches are rated for 42 V VCE. This is confirmed in the Absolute Maximum Ratings table and validated in Typical Applications circuits delivering +7 V, +12 V, and +40 V outputs. The LT3471EDD achieves this using standard external diodes (e.g., MBRM140) and inductors sized per the 1.2 MHz switching frequency.
Can the LT3471EDD generate both positive and negative outputs simultaneously?
Yes, the LT3471EDD can generate simultaneous positive and negative outputs-for example, +7 V and –7 V from a 3.3 V Li-ion input-as demonstrated in Figure 2 of the datasheet. Each channel operates independently: Channel 1 configured as a boost (FB1N to divider, FB1P to VREF), Channel 2 as an inverter (FB2N to GND, FB2P to divider). The LT3471EDD's ground-sensing error amplifiers eliminate need for level-shifting circuitry.
What is the purpose of the exposed pad (Pin 11) on the LT3471EDD DFN package?
The exposed pad (Pin 11) on the LT3471EDD is electrically and thermally connected to GND. Per the datasheet, it must be soldered to the PCB ground plane to serve as both the primary thermal dissipation path (θJC = 3°C/W) and low-impedance return for high-current switch nodes. Omitting this connection degrades thermal performance and risks exceeding 125°C junction temperature under full load.
How does the soft-start function work on the LT3471EDD, and what external components are required?
The LT3471EDD implements per-channel soft-start by ramping the voltage on SHDN/SS1 or SHDN/SS2 pins using an external RC network (e.g., 4.7 kΩ + 0.33 μF). As the pin voltage rises from 0 V to 1.8 V, the peak switch current increases linearly, limiting inrush. The LT3471EDD datasheet specifies that soft-start is active only below ~1.8 V and ceases once the pin is fully high-ensuring controlled startup without external timers.
Is the LT3471EDD RoHS-compliant and lead-free?
Yes, the LT3471EDD#TRPBF variant is RoHS-compliant and features lead-free (Pb-free) finish, as confirmed in the Order Information table. The part marking "LBHM" and packaging description "10-Lead (3mm × 3mm) Plastic DFN" align with Linear Technology's lead-free qualification standards. Aetrix Electronics supplies only certified lead-free versions meeting JEDEC J-STD-609 Category 1 requirements.
LT3471EDD Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-WFDFN Exposed Pad
- Packaging:
- Tube
- 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 FAQ
1.How can I place an order for LT3471EDD through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3471EDD 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 reliable?
The price and inventory of LT3471EDD are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3471EDD is usually 5 days.
3.What payment methods are accepted for LT3471EDD?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3471EDD transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3471EDD?
LT3471EDD orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3471EDD 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?
For technical support, including LT3471EDD datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3471EDD requirements.
6.How does Aetrix verify that LT3471EDD is sourced from the original manufacturer or authorized distributors?
All LT3471EDD 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 meets industry standards.
7.What is the process for return or replacement of LT3471EDD?
All LT3471EDD units undergo pre-shipment inspection (PSI). If there is an issue with LT3471EDD, 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 part is unused and in its original packaging.
Return procedure for LT3471EDD:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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