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Analog Devices Inc. LT1912EDD#PBF
- Part No.:
- LT1912EDD#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LT1912EDD#PBF.pdf
- Description:
- IC REG BUCK ADJ 2A 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,880
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Product details
Overview
LT1912EDD#PBF from Analog Devices (formerly Linear Technology) is a monolithic 36V input, 2A synchronous step-down switching regulator with adjustable 200kHz–500kHz frequency, integrated 0.25Ω bipolar NPN switch and on-die Schottky boost diode. It delivers regulated 3.3V/5V outputs in automotive battery regulation and industrial distributed supplies.
For engineers reviewing the LT1912EDD#PBF datasheet, LT1912EDD#PBF pinout, LT1912EDD#PBF application, or LT1912EDD#PBF equivalent, key selection factors include its 0.790V feedback reference, soft-start via RUN/SS pin, thermal performance in 3mm × 3mm DFN with exposed pad, and current-mode control for fast transient response in high-input-voltage DC/DC designs.
Technical Context
The LT1912EDD#PBF implements constant-frequency current-mode PWM control using an internal oscillator set by RT pin resistance, enabling precise duty-cycle regulation and inherent loop stability. Its bipolar NPN switch is driven by a BOOST-supplied voltage higher than VIN to ensure saturation, reducing conduction loss.
Operation relies on real-time sensing of switch current between VIN and SW pins, error amplification of FB-pin voltage against 0.790V reference, and VC-pin clamping for peak-current limiting. Frequency foldback below 200kHz occurs during low FB voltage (e.g., startup/overload), improving current control under fault conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.6V to 36V - supports direct connection to 24V industrial rails and 12V automotive batteries without pre-regulation. |
| Max Output Current | 2A - sufficient for powering FPGAs, microcontrollers, and interface ICs in compact embedded systems. |
| Switch On-Resistance | 0.25Ω - enables high efficiency at full load while minimizing thermal dissipation in thermally enhanced DFN package. |
| Feedback Reference | 0.790V ±10mV - allows precise output programming from 0.79V to 20V using standard resistor dividers. |
| Shutdown Current | <1µA - ensures ultra-low system standby power in battery-backed or energy-sensitive applications. |
| Switching Frequency | 200kHz to 500kHz - adjustable via RT pin resistor; higher frequencies reduce external inductor/capacitor size but trade off efficiency and dropout. |
| Min Switch Off-Time | 150ns - constrains maximum duty cycle and sets practical limits on minimum input voltage for given output and frequency. |
Pinout & Package
LT1912EDD#PBF is housed in a 10-lead, 3mm × 3mm plastic DFN package with exposed thermal pad (Pin 11) soldered to PCB ground for low θJA = 45°C/W and θJC = 10°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 11) | Power and signal ground reference | Exposed pad must be soldered to PCB ground plane to meet thermal specs and ensure stable operation. |
| RT (Pin 10) | Oscillator frequency setting input | Resistor to ground sets switching frequency: 68.1kΩ → 500kHz, 187kΩ → 200kHz per datasheet table. |
| VC (Pin 9) | Error amplifier output and current limit control | Voltage determines peak switch current; RC network to ground provides loop compensation and soft-start ramp shaping. |
| FB (Pin 8) | Output voltage sense input | Regulated to 0.790V; connects to resistor divider tap - defines output voltage as VOUT = 0.79V × (1 + R1/R2). |
| N/C (Pin 7) | No-connect terminal | Must be tied to GND per datasheet; floating or pulled high may cause undefined behavior. |
| SYNC (Pin 6) | External clock synchronization input | Accepts 250kHz–500kHz logic-level clock; enables multi-phase operation or EMI reduction via fixed-frequency alignment. |
| RUN/SS (Pin 5) | Enable and soft-start control | <0.2V = shutdown (<1µA IQ); ≥2.5V = active; external RC creates controlled output voltage ramp during startup. |
| VIN (Pin 4) | Main power input | Supplies internal regulator and switch; requires local 4.7µF ceramic bypass close to pin to suppress high-di/dt noise. |
| SW (Pin 3) | Switch node output | Connects directly to inductor, catch diode cathode, and boost capacitor - carries high dv/dt and di/dt transients. |
| BOOST (Pin 2) | Boost drive voltage supply | Driven above SW by external capacitor/diode; must exceed SW by ≥2.3V to fully saturate internal NPN switch. |
| BD (Pin 1) | Bias diode anode input | Connects to anode of internal Schottky; supplies bias current to internal regulator - improves efficiency when tied to regulated output ≥3V. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated boost Schottky diode | Eliminates external diode, reduces BOM count and board area, and ensures optimal timing match with internal switch. |
| Current-mode control architecture | Provides inherent cycle-by-cycle current limiting, fast transient response to load steps, and simplified loop compensation without ESR dependency. |
| Synchronizable switching frequency | Enables noise spectrum spreading and multi-converter phase alignment - critical for EMI-sensitive medical or automotive systems. |
| Thermally enhanced 3mm × 3mm DFN | Exposes die pad to PCB ground for efficient heat transfer - supports 2A continuous output in compact space-constrained layouts. |
| Soft-start via RUN/SS pin | Prevents inrush current and output overshoot by controlling VC ramp rate - eliminates need for external sequencing ICs in multi-rail systems. |
Applications
| Automotive Battery Regulation | Industrial Distributed Supply |
|---|---|
Use Scenario: Regulating raw 12V/24V vehicle battery to stable 3.3V for infotainment MCU and CAN transceivers under cold-crank (4.5V) and load-dump (36V) conditions. IC Role / Device Role / Timing Role: Primary buck converter providing isolated, ripple-controlled power domain with overvoltage/undervoltage protection. Use Value: Wide 3.6V–36V input range and <1µA shutdown current enable direct battery tie-in without pre-regulator, reducing system cost and failure points. | Use Scenario: Generating localized 5V rails for PLC I/O modules and sensor interfaces in factory automation cabinets with unregulated 24V DC bus. IC Role / Device Role / Timing Role: Point-of-load (POL) regulator delivering clean, well-regulated 5V at up to 2A with minimal external components. Use Value: Integrated boost diode and current-mode control allow reliable operation across wide temperature (-40°C to 125°C) and input variation without external compensation tuning. |
| Set-Top Box Power | Wall Transformer Regulation |
Use Scenario: Converting 12V from external wall adapter to 3.3V for digital video processing SoC and memory in consumer STB designs. IC Role / Device Role / Timing Role: High-efficiency secondary-side DC/DC converter managing dynamic load transients during video decode bursts. Use Value: 500kHz max switching frequency enables use of small 4.7µH inductors and ceramic capacitors, minimizing solution footprint and EMI filtering requirements. | Use Scenario: Replacing linear regulators in AC/DC adapter secondary side to improve efficiency and reduce thermal stress in compact enclosures. IC Role / Device Role / Timing Role: Efficient step-down regulator converting rectified 12–18V DC to 5V/2A for USB-powered peripherals. Use Value: 0.25Ω switch RDS(on) and thermal DFN package sustain full 2A load without heatsink, enabling smaller, cooler adapters meeting Energy Star requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3631EMSE#PBF | Higher 36V input, 1.5A output; uses MOSFET switch (lower RDS(on)), no integrated boost diode; requires external bootstrap circuit. | Better efficiency above 1A due to MOSFET switch; less suitable for space-constrained designs needing integrated diode. | Select LTC3631EMSE#PBF when higher efficiency at light loads or tighter thermal constraints demand MOSFET architecture and external bootstrap flexibility. |
| LM5164QPWPRQ1 | Automotive-grade (AEC-Q100), 65V input, 1A output; includes integrated high-side MOSFET and bootstrap diode; supports spread-spectrum frequency modulation. | Designed for harsh automotive environments; lower output current and different pinout prevent drop-in replacement. | Choose LM5164QPWPRQ1 only for AEC-Q100-compliant automotive applications where 65V input tolerance and spread-spectrum EMI reduction are mandatory. |
Compared with LTC3631EMSE#PBF and LM5164QPWPRQ1, LT1912EDD#PBF offers unique integration of bipolar switch + on-die Schottky diode in a thermally optimized DFN, making it optimal for cost-sensitive, space-limited 2A industrial and consumer DC/DC designs where 36V input and 0.79V reference precision are primary requirements.
Availability
LT1912EDD#PBF is available at Aetrix Electronics and suitable for automotive battery regulation, industrial distributed supply, set-top box power, and wall transformer regulation requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT1912EDD#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, Inc. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LT1912EDD#PBF belongs to ADI's legacy Linear Technology power management portfolio, designed specifically for rugged, wide-input-voltage DC/DC conversion in space- and thermal-constrained applications where reliability and integration outweigh ultra-high efficiency demands.
FAQ
What is the absolute maximum input voltage rating for LT1912EDD#PBF?
The absolute maximum VIN rating for LT1912EDD#PBF is 36V, as specified in the Absolute Maximum Ratings table. However, safe continuous operation depends on switching frequency and operating mode: under normal regulation, 36V is acceptable; during startup or overload, the maximum allowable VIN decreases per fSW and tOFF(MIN) constraints. Always verify worst-case duty cycle and thermal limits in final design. The LT1912EDD#PBF datasheet defines these boundaries precisely.
Does LT1912EDD#PBF require an external catch diode?
No, LT1912EDD#PBF does not require an external catch diode because it integrates a Schottky diode connected to the BD pin. This internal diode provides the necessary path for inductor current during switch-off time. External diodes are unnecessary and would conflict with the internal topology. The LT1912EDD#PBF datasheet confirms this integration in both the block diagram and Pin Functions section.
Can LT1912EDD#PBF synchronize to an external clock?
Yes, LT1912EDD#PBF supports external clock synchronization via the SYNC pin (Pin 6), accepting logic-level clocks from 250kHz to 500kHz. The SYNC pin must be driven with fast rise/fall times (<1µs) and proper voltage thresholds (0.5V low, 0.7V high). When unused, SYNC must be grounded. This capability enables EMI reduction and multi-phase interleaving in systems with multiple LT1912EDD#PBF devices.
What is the purpose of the BD pin on LT1912EDD#PBF?
The BD (Bias Diode) pin on LT1912EDD#PBF connects to the anode of the internal Schottky diode and supplies bias current to the internal regulator. When tied to a regulated output ≥3V, it shifts bias sourcing from VIN to the higher-efficiency output rail, reducing overall quiescent current and improving light-load efficiency. The LT1912EDD#PBF datasheet specifies minimum BD voltage as 2.7V and maximum as 30V.
How is soft-start implemented on LT1912EDD#PBF?
Soft-start on LT1912EDD#PBF is implemented via the RUN/SS pin (Pin 5): applying an external RC network between RUN/SS and GND generates a controlled voltage ramp that clamps the VC pin, thereby limiting peak switch current during startup. This prevents output overshoot and inrush current. The LT1912EDD#PBF datasheet provides design equations and typical values for R and C to achieve desired ramp time.
LT1912EDD#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-WFDFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3.6V
- Voltage - Input (Max):
- 36V
- Voltage - Output (Min/Fixed):
- 0.79V
- Voltage - Output (Max):
- 20V
- Current - Output:
- 2A
- Frequency - Switching:
- 200kHz ~ 500kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- 0°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-DFN (3x3)
LT1912EDD#PBF FAQ
1.How can I place an order for LT1912EDD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1912EDD#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 LT1912EDD#PBF reliable?
The price and inventory of LT1912EDD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1912EDD#PBF is usually 5 days.
3.What payment methods are accepted for LT1912EDD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1912EDD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1912EDD#PBF?
LT1912EDD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1912EDD#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 LT1912EDD#PBF?
For technical support, including LT1912EDD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1912EDD#PBF requirements.
6.How does Aetrix verify that LT1912EDD#PBF is sourced from the original manufacturer or authorized distributors?
All LT1912EDD#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 LT1912EDD#PBF meets industry standards.
7.What is the process for return or replacement of LT1912EDD#PBF?
All LT1912EDD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1912EDD#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 LT1912EDD#PBF part is unused and in its original packaging.
Return procedure for LT1912EDD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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