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Analog Devices Inc. LT1912EDD#TRPBF
- Part No.:
- LT1912EDD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LT1912EDD#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 2A 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,400
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Product details
Overview
LT1912EDD#TRPBF from Analog Devices (formerly Linear Technology) is a monolithic 36V, 2A, current-mode step-down switching regulator with adjustable 200kHz–500kHz switching frequency, integrated 0.25Ω bipolar NPN switch and on-die boost Schottky diode, designed for automotive battery regulation and industrial distributed supplies.
For engineers reviewing the LT1912EDD#TRPBF datasheet, LT1912EDD#TRPBF pinout, LT1912EDD#TRPBF application, or LT1912EDD#TRPBF equivalent, key selection considerations include input voltage range (3.6V–36V), soft-start via RUN/SS pin, synchronization capability (250kHz–500kHz), thermal performance in 3mm × 3mm DFN, and feedback reference accuracy (780–805mV).
Technical Context
The LT1912EDD#TRPBF employs constant-frequency current-mode control with an internal transconductance error amplifier (25µmho), slope compensation, and active VC-pin current limiting. Its oscillator is resistor-programmed via RT pin and supports external synchronization through SYNC pin with 0.5V/0.7V thresholds.
Operation relies on a boost capacitor network tied to BD and BOOST pins to drive the internal bipolar switch into saturation; minimum boost voltage is 1.5V, and BOOST pin withstands up to 56V. The device enters pulse-skipping mode under light load or during overvoltage transients while maintaining regulation up to 36V input.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.6V to 36V - supports wide-range industrial and automotive battery inputs without external pre-regulation. |
| Max Output Current | 2A - sustained delivery with internal switch current limit of 3.2A–4.2A (duty-cycle dependent). |
| Switching Frequency | 200kHz to 500kHz - set by RT resistor; synchronizable externally from 250kHz to 500kHz. |
| Feedback Reference | 780mV to 805mV - precise 0.79V nominal reference enables accurate output programming from 0.79V to 20V. |
| Shutdown Current | <1µA - ultra-low quiescent draw in shutdown, critical for always-on automotive modules. |
| On-Resistance | 0.25Ω - low RDS(on)-equivalent saturation resistance of integrated bipolar switch improves full-load efficiency. |
| Package | 10-pin 3mm × 3mm DFN with exposed pad - thermally enhanced layout for ≤45°C/W junction-to-ambient. |
Pinout & Package
LT1912EDD#TRPBF is housed in a 10-lead, 3mm × 3mm plastic DFN package with exposed thermal pad (Pin 11 = GND). The exposed pad must be soldered to PCB for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BD (Pin 1) | Bias Diode Anode Input | Supplies current to internal bias regulator; connects to anode of external boost Schottky diode. |
| BOOST (Pin 2) | Boost Drive Voltage Node | Provides >VIN drive to internal bipolar switch; requires ≥2.3V above SW for full saturation. |
| SW (Pin 3) | Switch Node | Output of internal power switch; connects to inductor, catch diode, and boost capacitor. |
| VIN (Pin 4) | Main Power Input | Supplies internal regulator and switch; must be locally bypassed with ≥4.7µF ceramic capacitor. |
| RUN/SS (Pin 5) | Enable & Soft-Start Control | Logic-level enable (≥2.5V = ON); RC ramp here sets controlled output voltage rise time. |
| SYNC (Pin 6) | External Clock Input | Accepts TTL/CMOS clock edges (rise/fall <1µs) to synchronize switching across multiple regulators. |
| N/C (Pin 7) | No Connect | Internally unused; must be tied to GND per datasheet for stability. |
| FB (Pin 8) | Feedback Sense Input | Regulated to 0.79V; connects to resistor divider tap for output voltage programming. |
| VC (Pin 9) | Error Amplifier Output | Controls peak switch current; RC network here sets loop compensation and stability. |
| RT (Pin 10) | Oscillator Timing Input | Resistor to GND sets switching frequency (e.g., 68.1kΩ = 500kHz). |
| GND (Pin 11) | Power Ground / Thermal Pad | Exposed pad is functional GND; mandatory solder connection for thermal management and noise reduction. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Boost Schottky Diode | Eliminates external boost diode, reducing BOM count and board area in compact 3mm × 3mm DFN layout. |
| Adjustable Frequency with Sync | Enables EMI optimization and multi-rail coordination without sacrificing efficiency or transient response. |
| Current-Mode Control Architecture | Provides inherent cycle-by-cycle current limiting, fast transient response, and simplified loop compensation. |
| Soft-Start via RUN/SS Pin | Prevents inrush current and output overshoot using external RC; eliminates need for dedicated soft-start IC. |
| Thermally Enhanced DFN Package | Exposes die pad as GND for low θJA (45°C/W) and robust thermal performance in high-power density designs. |
Applications
| Automotive Battery Regulation | Industrial Distributed Supply |
|---|---|
|
Use Scenario: Regulating 12V/24V vehicle battery rails to 3.3V or 5V for infotainment ECUs and ADAS sensors. IC Role / Device Role / Timing Role: Primary buck converter delivering stable 2A output under cold-crank (4.5V) and load-dump (36V) conditions. Use Value: Wide 3.6V–36V input range and <1µA shutdown current meet ISO 16750-2 automotive stress test requirements. |
Use Scenario: Generating local 5V/12V rails from 24V factory automation bus for PLC I/O modules and motor drivers. IC Role / Device Role / Timing Role: High-efficiency point-of-load regulator with synchronized switching to reduce system-level conducted EMI. Use Value: 500kHz operation allows use of small 4.7µH inductors and 4.7µF ceramic input caps, minimizing footprint. |
| Set-Top Box Power | Wall Transformer Regulation |
|
Use Scenario: Converting 12V adapter output to 3.3V for SoC and memory in consumer STB platforms. IC Role / Device Role / Timing Role: Main DC-DC converter enabling low-noise, low-ripple supply for sensitive video processing circuits. Use Value: Ceramic-capable design yields <10mVpp output ripple at 2A, meeting HDMI and DDR timing margin requirements. |
Use Scenario: Replacing linear regulators in universal AC/DC wall adapters to improve efficiency and thermal performance. IC Role / Device Role / Timing Role: High-input-voltage buck controller accepting up to 36V unregulated DC from bridge rectifier + bulk cap. Use Value: Integrated 0.25Ω switch and boost diode eliminate discrete FET/diode losses, achieving >90% efficiency at 1A–2A loads. |
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 | 40V input, 1.5A, 3mm × 4mm MSOP, no integrated boost diode; requires external Schottky. | Better suited for space-constrained designs needing higher VIN rating but lower current. | Select when input exceeds 36V or when external boost diode placement improves thermal layout. |
| MP2451DT-LF-Z | 36V input, 0.6A, 8-pin SOIC, fixed 520kHz freq, no SYNC or soft-start; lower cost, lower current. | Targeted at cost-sensitive, low-power consumer applications where 2A is unnecessary. | Select only for sub-1A loads where footprint and feature set allow trade-offs in control flexibility. |
Compared with LTC3631EMSE#PBF and MP2451DT-LF-Z, the LT1912EDD#TRPBF uniquely combines 2A output, integrated boost diode, SYNC capability, and soft-start in a 3mm × 3mm DFN-making it optimal for space-limited, high-reliability 2A buck applications requiring full feature integration.
Availability
LT1912EDD#TRPBF is available at Aetrix Electronics and suitable for automotive battery regulation, industrial distributed supplies, and set-top box power systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LT1912EDD#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 acquired Linear Technology in 2017 and maintains its legacy of high-performance analog and power management ICs with rigorous automotive and industrial qualification.
The LT1912EDD#TRPBF belongs to Linear's monolithic buck regulator product line, engineered for rugged, wide-input-voltage DC-DC conversion in harsh environments where reliability, thermal performance, and integration are critical.
FAQ
What is the maximum input voltage supported by the LT1912EDD#TRPBF?
The LT1912EDD#TRPBF supports up to 36V continuous input voltage when operating in regulation. During startup, short-circuit, or overload, the safe maximum depends on switching frequency and duty cycle constraints-typically limited to ~30V unless using frequency foldback. Absolute maximum ratings specify 36V on VIN and 56V on BOOST pin.
Does the LT1912EDD#TRPBF require an external boost diode?
No-the LT1912EDD#TRPBF integrates a boost Schottky diode on-die, eliminating the need for an external component. The BD pin connects directly to the anode of this internal diode, and the BOOST pin uses the resulting boosted voltage to fully saturate the internal bipolar switch.
Can the LT1912EDD#TRPBF be synchronized to an external clock?
Yes-the LT1912EDD#TRPBF features a dedicated SYNC pin (Pin 6) that accepts TTL/CMOS clock signals from 250kHz to 500kHz. Clock edges must have rise/fall times faster than 1µs. Grounding SYNC disables synchronization and reverts to internal oscillator operation.
What is the purpose of the exposed pad on the LT1912EDD#TRPBF DFN package?
The exposed pad (Pin 11) on the LT1912EDD#TRPBF is electrically and thermally connected to GND. It must be soldered to a PCB copper pour to achieve specified thermal resistance (θJA = 45°C/W) and ensure stable operation under 2A load conditions. Leaving it unconnected degrades thermal performance and may cause premature thermal shutdown.
How is output voltage programmed on the LT1912EDD#TRPBF?
Output voltage is programmed using a resistor divider between VOUT and FB (Pin 8), referenced to the internal 0.79V feedback voltage. For example, to set 5V output: R1 = R2 × ((5V / 0.79V) − 1). Standard 1% resistors are recommended, and the FB pin bias current is only 7–30nA, minimizing divider error.
LT1912EDD#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- 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#TRPBF FAQ
1.How can I place an order for LT1912EDD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1912EDD#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 LT1912EDD#TRPBF reliable?
The price and inventory of LT1912EDD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1912EDD#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1912EDD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1912EDD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1912EDD#TRPBF?
LT1912EDD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1912EDD#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 LT1912EDD#TRPBF?
For technical support, including LT1912EDD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1912EDD#TRPBF requirements.
6.How does Aetrix verify that LT1912EDD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1912EDD#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 LT1912EDD#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1912EDD#TRPBF?
All LT1912EDD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1912EDD#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 LT1912EDD#TRPBF part is unused and in its original packaging.
Return procedure for LT1912EDD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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