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Analog Devices Inc. LT1913EDD#PBF
- Part No.:
- LT1913EDD#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LT1913EDD#PBF.pdf
- Description:
- IC REG BUCK ADJ 3.5A 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,044
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Product details
Overview
LT1913EDD#PBF from Analog Devices (formerly Linear Technology) is a monolithic current-mode step-down switching regulator with 200kHz–2.4MHz adjustable frequency, 25V max input, 3.5A output current, and integrated 95mΩ NPN switch and boost Schottky diode. It delivers regulated 0.79V–25V output in automotive battery regulation and portable power systems.
For engineers reviewing the LT1913EDD#PBF datasheet, LT1913EDD#PBF pinout, LT1913EDD#PBF application, or LT1913EDD#PBF equivalent, key selection factors include soft-start via RUN/SS, power-good flag signaling at 91% VOUT, thermal protection, exposed-pad DFN thermal management, and synchronization capability from 250kHz to 2MHz.
Technical Context
The LT1913EDD#PBF implements constant-frequency current-mode control using an internal transconductance error amplifier (525 μ℧), slope-compensated PWM, and RS flip-flop oscillator driven by RT-resistor programming. Its bipolar NPN switch is driven via BOOST pin voltage > VIN + 2.3V for full saturation.
Operation includes frequency foldback during startup/overload, VC-pin clamping for current limiting (4.6–6.0A), active soft-start via RUN/SS ramp, and open-collector PG output valid only when VIN > 3.6V and RUN/SS high - all within –40°C to 125°C junction range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.6V to 25V - supports wide-range industrial and automotive supplies without external pre-regulation |
| Max Output Current | 3.5A continuous - enables single-chip 5V/3.3V rails for microcontrollers and FPGAs |
| Switching Frequency | 200kHz to 2.4MHz - selectable via RT resistor; higher frequencies allow smaller inductors (e.g., 4.7μH @ 600kHz) |
| Feedback Reference | 0.790V ±10mV - sets output accuracy; enables precise 1.2V, 3.3V, 5V, or custom voltages with resistor divider |
| Power Good Threshold | VFB ≥ 91% of target - provides reliable system reset timing with 65mV hysteresis |
| Shutdown Quiescent Current | <1μA - meets ultra-low-power requirements for battery-backed or always-on subsystems |
| Thermal Protection | Integrated junction shutdown - prevents damage during sustained overload or poor PCB heatsinking |
Pinout & Package
LT1913EDD#PBF uses a 10-lead 3mm × 3mm plastic DFN package with exposed pad (Pin 11) soldered to PCB ground for θJA = 45°C/W thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BD (Pin 1) | Boost Diode Anode Supply | Provides bias current to internal regulator; connects to cathode of external boost capacitor |
| BOOST (Pin 2) | Switch Drive Boost Node | Supplies >VIN voltage to saturate internal NPN switch; requires 0.47μF ceramic capacitor |
| SW (Pin 3) | Switch Output | Drives inductor and catch diode; carries full pulsed load current and must be routed with low-inductance layout |
| VIN (Pin 4) | Main Input Supply | Primary power source for switch and internal regulator; requires local 10μF X7R ceramic bypass |
| RUN/SS (Pin 5) | Enable & Soft-Start Control | Pull ≥2.5V for operation; RC network here controls output voltage ramp rate during startup |
| SYNC (Pin 6) | External Clock Input | Accepts 250kHz–2MHz square wave for EMI reduction or multi-phase synchronization |
| PG (Pin 7) | Power Good Flag | Open-collector output pulled high externally; asserts when VOUT reaches 91% of setpoint |
| FB (Pin 8) | Feedback Sense | Regulated to 0.790V; connects to resistor divider tap for output voltage programming |
| VC (Pin 9) | Error Amplifier Output | Controls peak switch current; RC compensation network here stabilizes current-mode loop |
| RT (Pin 10) | Oscillator Frequency Set | Resistor-to-ground sets switching frequency (e.g., 63.4kΩ = 600kHz per datasheet Fig. 1) |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Boost Schottky Diode | Eliminates external boost diode; reduces BOM count and board area in compact DFN layout |
| Saturating Bipolar NPN Switch | 95mΩ on-resistance at 3.5A enables high efficiency (>90% at 12V→5V/3.5A) without MOSFET gate drivers |
| Adjustable Frequency with Sync | 200kHz–2.4MHz tuning plus 250kHz–2MHz sync input allows EMI compliance across diverse system clocks |
| Controlled Soft-Start | RUN/SS pin accepts external RC to limit inrush current and prevent output overshoot during power-up |
| Power-Good Flag with Hysteresis | PG asserts at 91% VOUT with 10mV hysteresis - ensures clean system reset without chatter near regulation threshold |
Applications
| Automotive Battery Regulation | Portable Product Power |
|---|---|
Use Scenario: Regulating 12V/24V vehicle battery to stable 3.3V or 5V for infotainment MCU and CAN transceivers under cold-crank (4.5V) and load-dump (36V transient) conditions. IC Role / Device Role / Timing Role: Primary buck converter providing isolated, ripple-controlled DC supply with thermal shutdown during engine-off battery drain. Use Value: Wide 3.6V–25V input range and 125°C rated operation ensure reliability across automotive temperature extremes without derating. | Use Scenario: Powering ARM Cortex-M7 SoC and LPDDR3 memory in handheld medical scanner requiring <1μA shutdown current and fast transient response to imaging bursts. IC Role / Device Role / Timing Role: High-efficiency step-down regulator delivering 1.1V core and 3.3V I/O rails with soft-start to avoid brownout during wake-from-sleep. Use Value: 3.5A output and current-mode control enable sub-10μs recovery from 2A load steps - critical for real-time sensor processing. |
| Distributed Supply Regulation | Industrial Sensor Node Power |
Use Scenario: Generating local 5V rail from 24V factory bus for PLC I/O modules, where multiple converters operate in parallel with synchronized switching to minimize conducted EMI. IC Role / Device Role / Timing Role: Synchronizable buck regulator enabling phase-shifted operation across adjacent slots to reduce peak input current and filter stress. Use Value: SYNC pin accepts 250kHz–2MHz clock - allows alignment with master system clock or spread-spectrum sources for EMC certification. | Use Scenario: Powering low-power wireless sensor node (sub-GHz RF + Cortex-M0+) from 12V field wiring, requiring robust start-up under capacitive loads and fault detection. IC Role / Device Role / Timing Role: Primary DC-DC converter with PG flag feeding microcontroller's reset pin and BD pin biasing from regulated output for improved light-load efficiency. Use Value: Integrated boost diode and BD-bias capability reduce no-load quiescent current to 0.45mA - extending 10-year battery life in sealed enclosures. |
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 output, 3mm × 4mm MSOP; no integrated boost diode; requires external bootstrap cap | Better suited for higher-input industrial rails; lower output current limits use in high-power portable designs | Select when input exceeds 25V or when footprint allows larger MSOP and external diode |
| TPS54331DR | 28V input, 3A output, SOIC-8; MOSFET-based; no PG flag or SYNC; 0.8V ref | Lacks power-good signaling and synchronization - unsuitable for safety-critical or EMI-sensitive multi-rail systems | Choose for cost-sensitive, non-safety applications where PG and SYNC are not required |
Compared with LTC3631EMSE#PBF and TPS54331DR, LT1913EDD#PBF uniquely combines 25V/3.5A capability, integrated boost diode, PG flag, and SYNC in a 3mm × 3mm DFN - making it optimal for space-constrained, high-reliability buck conversion where startup control and system coordination matter.
Availability
LT1913EDD#PBF is available at Aetrix Electronics and suitable for automotive battery regulation, portable product power, and distributed supply regulation requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT1913EDD#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 (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management ICs, serving precision instrumentation, industrial automation, and automotive markets.
The LT1913EDD#PBF belongs to Linear's legacy high-voltage buck regulator family, designed specifically for rugged, wide-input industrial and automotive power conversion where integration, thermal robustness, and functional safety features like PG and thermal shutdown are essential.
FAQ
What is the maximum input voltage rating for LT1913EDD#PBF?
The absolute maximum input voltage (VIN) for LT1913EDD#PBF is 25V, as specified in the Absolute Maximum Ratings table. Continuous operation up to this rating is supported across the full –40°C to 125°C junction temperature range. Transient overvoltage events exceeding 25V - such as automotive load dump - require external clamping, as the device does not include built-in overvoltage protection beyond its 25V absolute limit. The BOOST pin has a separate 50V absolute maximum rating.
Does LT1913EDD#PBF require an external boost diode?
No, LT1913EDD#PBF integrates a boost Schottky diode on-die, eliminating the need for an external component. The BD pin (Pin 1) connects directly to the anode of this internal diode, which charges the external boost capacitor tied to the BOOST pin (Pin 2). This integration reduces bill-of-materials count, PCB area, and layout complexity - a key differentiator versus controllers requiring external bootstrap circuits.
How is the output voltage programmed on LT1913EDD#PBF?
The output voltage of LT1913EDD#PBF is programmed using a resistor divider between VOUT and FB (Pin 8), which regulates to a precise 0.790V reference. The formula is R1 = R2 × ((VOUT / 0.790V) − 1), where R2 connects from FB to GND. For example, to set 5.0V output: R2 = 10kΩ, R1 = 10kΩ × ((5.0 / 0.790) − 1) ≈ 53.4kΩ. Standard 1% resistors are recommended for accuracy.
What thermal considerations apply to LT1913EDD#PBF in the DFN package?
LT1913EDD#PBF uses a 10-lead 3mm × 3mm DFN with exposed pad (Pin 11) that must be soldered to a PCB thermal pad connected to solid ground planes. Thermal resistance is θJA = 45°C/W and θJC = 10°C/W. To maintain safe operation at 3.5A, the PCB must provide ≥2 cm² of copper area under the exposed pad with ≥4 thermal vias (0.3mm diameter) to inner/ground layers. Junction temperature must stay ≤125°C - derating is required above 85°C ambient without forced airflow.
Can LT1913EDD#PBF synchronize to an external clock?
Yes, LT1913EDD#PBF supports external clock synchronization via the SYNC pin (Pin 6), accepting TTL/CMOS-compatible square waves from 250kHz to 2MHz. The pin has defined logic thresholds (0.5V low, 0.8V high) and <0.1μA bias current. When unused, SYNC must be grounded - floating is prohibited. Synchronization enables EMI reduction in dense layouts and phase-aligned operation in multi-converter systems, preserving the device's full 200kHz–2.4MHz internal frequency range while locking to external timing.
LT1913EDD#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):
- 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#PBF FAQ
1.How can I place an order for LT1913EDD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1913EDD#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 LT1913EDD#PBF reliable?
The price and inventory of LT1913EDD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1913EDD#PBF is usually 5 days.
3.What payment methods are accepted for LT1913EDD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1913EDD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1913EDD#PBF?
LT1913EDD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1913EDD#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 LT1913EDD#PBF?
For technical support, including LT1913EDD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1913EDD#PBF requirements.
6.How does Aetrix verify that LT1913EDD#PBF is sourced from the original manufacturer or authorized distributors?
All LT1913EDD#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 LT1913EDD#PBF meets industry standards.
7.What is the process for return or replacement of LT1913EDD#PBF?
All LT1913EDD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1913EDD#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 LT1913EDD#PBF part is unused and in its original packaging.
Return procedure for LT1913EDD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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