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Analog Devices Inc. LT1913EDD#TRPBF
- Part No.:
- LT1913EDD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LT1913EDD#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 3.5A 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,255
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Product details
Overview
LT1913EDD#TRPBF from Analog Devices (formerly Linear Technology) is a monolithic current-mode step-down switching regulator with integrated 95mΩ NPN power switch and on-die Schottky boost diode. It operates from 3.6V to 25V input, delivers up to 3.5A output current, supports adjustable switching frequency from 200kHz to 2.4MHz, and features power good flag, soft-start, thermal protection, and 0.790V feedback reference - used in automotive battery regulation and industrial distributed supplies.
For engineers reviewing the LT1913EDD#TRPBF datasheet, LT1913EDD#TRPBF pinout, LT1913EDD#TRPBF application, or LT1913EDD#TRPBF equivalent, key selection considerations include verified 3.5A continuous output capability, confirmed 10-pin 3mm × 3mm DFN package with exposed GND pad, validated 91% power-good threshold accuracy, and documented thermal shutdown behavior at 150°C junction temperature.
Technical Context
The LT1913EDD#TRPBF implements constant-frequency current-mode control using an internal transconductance error amplifier (525 μ℧), slope compensation, and RS flip-flop–based PWM latch. Its oscillator frequency is set by an external resistor on the RT pin and folds back during low FB voltage conditions to limit inrush current.
It integrates a bipolar NPN switch driven via BOOST pin voltage (≥2.3V above SW), uses BD pin for bias sourcing from regulated output to improve efficiency, and employs VC pin as error amplifier output controlling peak switch current with active clamp limiting - enabling stable operation across 3.6V–25V input and 0.79V–25V output ranges.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.6V to 25V - supports wide-range industrial and automotive battery inputs without external pre-regulation |
| Max Output Current | 3.5A continuous - verified under thermal limits with 3mm × 3mm DFN package and exposed pad soldered to PCB |
| Switching Frequency | 200kHz to 2.4MHz - adjustable via RT-to-GND resistor; synchronizable from 250kHz to 2MHz |
| Feedback Reference | 0.790V ±10mV - precise regulation point enabling accurate output programming with standard resistor dividers |
| Power Good Threshold | 91% of programmed VOUT - open-collector PG flag asserts when output reaches regulation tolerance |
| Shutdown Current | <1μA - achieved by pulling RUN/SS pin low; enables ultra-low-power system standby modes |
| On-Resistance | 95mΩ - measured at ISW = 3.5A; defines conduction loss and thermal dissipation in buck stage |
| Thermal Shutdown | 150°C typical - protects device during overload or poor heatsinking; auto-recovery on cooldown |
Pinout & Package
LT1913EDD#TRPBF is housed in a 10-pin 3mm × 3mm plastic DFN package with exposed thermal pad (Pin 11), rated for –40°C to 125°C operating junction temperature. The exposed pad must be soldered to PCB ground plane for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BD (Pin 1) | Bias Diode Anode | Connects to boost Schottky anode; supplies current to internal bias regulator - improves efficiency when tied to regulated output |
| BOOST (Pin 2) | Boost Drive Voltage | Provides >VIN drive to NPN switch base; requires external capacitor/diode network to generate ~VIN + 2.3V |
| SW (Pin 3) | Switch Node | Output of internal NPN switch; connects to inductor, catch diode cathode, and boost capacitor |
| VIN (Pin 4) | Main Input Supply | Primary power source for internal regulator and switch; requires local 10μF ceramic bypass |
| RUN/SS (Pin 5) | Enable & Soft-Start Control | Pull low for shutdown (<1μA IQ); ramp voltage here controls output voltage slew rate during startup |
| SYNC (Pin 6) | External Clock Input | Accepts TTL/CMOS clock edges (rise/fall <1μs); synchronizes switching to external source between 250kHz–2MHz |
| PG (Pin 7) | Power Good Flag | Open-collector output; pulled high externally; goes low when FB reaches 91% of target |
| FB (Pin 8) | Feedback Input | Regulated to 0.790V; connects to resistor divider tap - sets output voltage per R1 = R2 × (VOUT/0.79 − 1) |
| VC (Pin 9) | Error Amplifier Output | Controls peak switch current; RC network to ground sets loop compensation poles/zeros |
| RT (Pin 10) | Oscillator Frequency Set | Resistor to GND sets switching frequency (e.g., 63.4kΩ → 600kHz); supports 200kHz–2.4MHz range |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Boost Schottky Diode | Eliminates external boost diode; reduces BOM count and layout area while maintaining ≥2.3V BOOST–SW margin |
| Current-Mode Control Architecture | Enables fast transient response and inherent cycle-by-cycle current limiting without requiring output capacitor ESR |
| Programmable Soft-Start | Controlled output voltage ramp via RC network on RUN/SS pin - prevents inrush current and output overshoot |
| Thermal Protection with Auto-Restart | Shuts down at ~150°C junction; resumes operation after die cools - ensures reliability under sustained overload |
| Power Good Flag with Hysteresis | PG asserts when VOUT reaches 91% of target with 10mV hysteresis - provides clean system-level power sequencing signal |
| Wide Input Range Support | Validated operation from 3.6V to 25V input - accommodates 12V/24V automotive batteries and industrial rails without derating |
Applications
| Automotive Battery Regulation | Industrial Distributed Supply |
|---|---|
Use Scenario: Regulating 12V/24V vehicle battery to 5V/3.3V for infotainment and ADAS modules under cold-crank (4.5V) and load-dump (36V transient) conditions. IC Role / Device Role: Primary buck converter with wide VIN support, thermal robustness, and power-good signaling for MCU reset coordination. Use Value: Maintains 3.5A output at 12V input with 90%+ efficiency; PG flag enables safe microcontroller boot sequence after stable rail establishment. |
Use Scenario: Providing isolated 5V/12V rails in programmable logic controllers (PLCs) where input varies from 18V to 32V DC due to field wiring impedance. IC Role / Device Role: High-efficiency, thermally resilient step-down regulator with adjustable frequency to avoid noise-sensitive bands. Use Value: 2.4MHz max switching enables compact 2.2μH inductors; exposed DFN pad sustains 3.5A continuous load at 70°C ambient without heatsink. |
| Portable Product Power | Wall Transformer Regulation |
Use Scenario: Converting 9V–20V USB PD or wall adapter output to 3.3V for portable medical monitors with strict EMI and size constraints. IC Role / Device Role: Compact, high-frequency buck regulator minimizing inductor/capacitor footprint while delivering full-rated current. Use Value: 3mm × 3mm DFN package fits tight layouts; 2.4MHz operation allows 1.0μH inductor and 10μF ceramic output cap - reducing solution volume by >40% vs. 500kHz designs. |
Use Scenario: Replacing linear regulators in AC/DC adapter secondary-side circuits to improve efficiency and reduce heat in enclosed enclosures. IC Role / Device Role: Efficient step-down stage accepting unregulated rectified DC (e.g., 15V–25V) and delivering stable 5V/3.3V outputs. Use Value: 95mΩ switch and integrated boost diode achieve >88% efficiency at 2A/5V from 24V input - cutting thermal load vs. LM7805-based solutions. |
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 max input; lower 2.5A output; integrated MOSFETs; 3mm × 4mm MSOP package | Better suited for 36V industrial inputs but limited to 2.5A; lacks SYNC and PG pins | Select when input exceeds 25V or board space permits larger MSOP; avoid if 3.5A or synchronization required |
| MP2451DT-LF-Z | 3.3V–36V input; 2A output; 2MHz fixed frequency; no PG or SYNC; smaller 8-pin SOIC package | Lower cost and simpler layout but no power-good signaling or frequency adjustability | Choose for cost-sensitive 2A applications without sequencing or EMI tuning needs; not drop-in for LT1913EDD#TRPBF |
Compared with LTC3631EMSE#PBF and MP2451DT-LF-Z, LT1913EDD#TRPBF uniquely combines 25V input, 3.5A output, adjustable 200kHz–2.4MHz frequency, power-good flag, and SYNC capability in a 3mm × 3mm DFN - making it optimal for space-constrained, high-reliability systems requiring precise power sequencing and EMI control.
Availability
LT1913EDD#TRPBF is available at Aetrix Electronics and suitable for automotive battery regulation, industrial distributed supply, and portable product power applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LT1913EDD#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, serving industrial, automotive, communications, and healthcare markets.
The LT1913EDD#TRPBF belongs to Linear's legacy high-efficiency monolithic buck regulator family, designed specifically for wide-input industrial and automotive power conversion where thermal resilience, precision regulation, and system-level signaling (PG, SYNC) are critical.
FAQ
What is the maximum continuous output current supported by the LT1913EDD#TRPBF?
The LT1913EDD#TRPBF delivers up to 3.5A continuous output current under thermal limits defined by its 10-pin 3mm × 3mm DFN package with exposed GND pad. This rating assumes proper PCB copper area for heat dissipation, ambient temperature ≤70°C, and input/output conditions per the datasheet's efficiency curves (e.g., VIN = 12V, VOUT = 5V, fSW = 600kHz). Derating applies above 70°C ambient.
Does the LT1913EDD#TRPBF require an external boost diode?
No, the LT1913EDD#TRPBF integrates a Schottky boost diode on-die - connected between BD and SW pins - eliminating the need for an external boost diode. This reduces component count and layout complexity while ensuring reliable bootstrap operation for the internal NPN switch driver across the full 3.6V–25V input range.
How is the switching frequency set on the LT1913EDD#TRPBF?
The switching frequency of the LT1913EDD#TRPBF is set by connecting a resistor from the RT pin (Pin 10) to ground. Values from 9.09kΩ (2.4MHz) to 215kΩ (200kHz) are specified in the datasheet. For example, a 63.4kΩ resistor yields 600kHz operation. The frequency is also synchronizable to an external clock (250kHz–2MHz) via the SYNC pin (Pin 6).
What is the function of the RUN/SS pin on the LT1913EDD#TRPBF?
The RUN/SS pin (Pin 5) on the LT1913EDD#TRPBF serves dual functions: applying ≤0.2V places the device in shutdown mode (<1μA quiescent current), while applying ≥2.5V enables normal operation. When an RC network is connected from RUN/SS to ground, it generates a controlled voltage ramp that translates into a soft-started output voltage ramp - preventing inrush current and output overshoot during power-up.
Is the LT1913EDD#TRPBF pin-compatible with other Linear/Analog Devices buck regulators?
No, the LT1913EDD#TRPBF has a unique 10-pin DFN pinout optimized for its integrated boost diode, BD bias path, and VC-based compensation - it is not pin-compatible with LTC36xx, LT86xx, or other Linear buck families. Substitution requires full schematic and layout review; verified alternatives like LTC3631EMSE#PBF differ in pin count, function allocation, and package dimensions.
LT1913EDD#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):
- 25V
- Voltage - Output (Min/Fixed):
- 0.79V
- Voltage - Output (Max):
- 24.25V
- Current - Output:
- 3.5A
- Frequency - Switching:
- 230kHz ~ 2.45MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- 0°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-DFN (3x3)
LT1913EDD#TRPBF FAQ
1.How can I place an order for LT1913EDD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1913EDD#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 LT1913EDD#TRPBF reliable?
The price and inventory of LT1913EDD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1913EDD#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1913EDD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1913EDD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1913EDD#TRPBF?
LT1913EDD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1913EDD#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 LT1913EDD#TRPBF?
For technical support, including LT1913EDD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1913EDD#TRPBF requirements.
6.How does Aetrix verify that LT1913EDD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1913EDD#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 LT1913EDD#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1913EDD#TRPBF?
All LT1913EDD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1913EDD#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 LT1913EDD#TRPBF part is unused and in its original packaging.
Return procedure for LT1913EDD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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