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Analog Devices Inc. LT1913IDD#TRPBF
- Part No.:
- LT1913IDD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LT1913IDD#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 3.5A 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,604
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Product details
Overview
LT1913IDD#TRPBF from Analog Devices (formerly Linear Technology) is a monolithic current-mode step-down switching regulator supporting 3.6V to 25V input, delivering up to 3.5A output at adjustable 200kHz–2.4MHz switching frequency, with integrated 95mΩ NPN switch and on-die Schottky boost diode. It is used in automotive battery regulation, portable power supplies, and industrial distributed DC-DC conversion where wide VIN range and thermal robustness are required.
For engineers reviewing the LT1913IDD#TRPBF datasheet, LT1913IDD#TRPBF pinout, LT1913IDD#TRPBF application, or LT1913IDD#TRPBF equivalent, key selection considerations include its 0.790V feedback reference, power good flag with 91% threshold, soft-start via RUN/SS pin, thermal shutdown, and DFN-10 (3mm × 3mm) package with exposed GND pad for low θJC = 10°C/W.
Technical Context
The LT1913IDD#TRPBF implements constant-frequency current-mode control using an internal transconductance error amplifier (525 μ℧), slope-compensated PWM, and RS flip-flop oscillator synchronized by RT resistor. Its VC pin directly controls peak switch current with 5.3 A/V gain, while active clamping limits VC to prevent overcurrent.
Operation relies on external boost capacitor (0.47μF typical) to generate >2.3V above SW for full NPN saturation; bias can be sourced from BD pin when VBD ≥ 3V, improving efficiency. Frequency foldback reduces fSW during startup or overload to limit inrush and sustain regulation under fault conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.6V to 25V - supports automotive cold-crank (≥3.6V) and industrial 24V rail without external pre-regulation |
| Max Output Current | 3.5A continuous - limited by thermal design and inductor RMS rating; peak switch current up to 5.4A at low duty cycle |
| Switching Frequency | 200kHz to 2.4MHz - set by RT resistor; enables tradeoff between inductor size (↑f → ↓L) and efficiency (↑f → ↑losses) |
| Feedback Reference | 0.790V ±15mV - precise reference enabling accurate output programming from 0.79V to 25V via resistor divider |
| Power Good Threshold | VOUT ≥ 91% of programmed value - open-collector PG flag asserts high only when regulation is stable and VIN > 3.6V |
| Shutdown Current | <1μA - achieved by pulling RUN/SS ≤ 0.2V; enables ultra-low-power standby in battery-powered systems |
| On-Resistance | 95mΩ - NPN switch RCE(SAT) at ISW = 3.5A ensures <335mV drop, minimizing conduction loss at high load |
Pinout & Package
LT1913IDD#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 junction temperature. The exposed pad must be soldered to PCB ground plane for thermal performance (θJC = 10°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BD (Pin 1) | Boost Diode Anode Supply | Connects to anode of internal Schottky; also powers internal bias regulator when VBD ≥ 3V |
| BOOST (Pin 2) | Boost Drive Voltage Node | Provides >VIN voltage to saturate NPN switch; requires external 0.47μF capacitor to SW |
| SW (Pin 3) | Switch Output Node | Drives external inductor and catch diode; carries full pulsed switch current and high dv/dt |
| VIN (Pin 4) | Main Input Power Supply | Supplies internal regulator and switch; requires local 10μF ceramic bypass close to pin |
| RUN/SS (Pin 5) | Enable & Soft-Start Control | Pull ≤0.2V to shut down (<1μA IQ); ramp with RC network for controlled VOUT rise |
| SYNC (Pin 6) | External Clock Input | Accepts 250kHz–2MHz square wave for synchronization; must not float |
| PG (Pin 7) | Power Good Open-Collector | Sinks current when VFB < 91% of target; requires external pull-up for logic-level signaling |
| FB (Pin 8) | Feedback Input | Regulated to 0.790V; connects to resistor divider tap for output voltage setting |
| VC (Pin 9) | Error Amplifier Output | Controls peak switch current; compensation network (RC + CC) connected here for loop stability |
| RT (Pin 10) | Oscillator Frequency Set | Resistor to GND sets fSW; e.g., 63.4kΩ → 600kHz per datasheet Figure 1 |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Boost Schottky Diode | Eliminates external boost diode; reduces BOM count and layout area while ensuring reliable NPN drive |
| Current Mode Control | Enables fast transient response and inherent cycle-by-cycle current limiting without requiring output capacitor ESR |
| Programmable Soft-Start | Controlled VOUT ramp via RC on RUN/SS prevents inrush current and output overshoot during power-up |
| Thermal Protection | Internal shutdown activates if junction temperature exceeds safe limit; auto-recovery after cooldown |
| Synchronizable Switching | SYNC pin accepts external clock (250kHz–2MHz), enabling noise-sensitive systems to avoid EMI bands |
Applications
| Automotive Battery Regulation | Portable Product Power |
|---|---|
Use Scenario: Regulating 12V/24V vehicle battery (with cold-crank dips to 3.6V) to 3.3V or 5V for infotainment ECUs. IC Role / Device Role / Timing Role: Primary buck controller managing high-current, wide-input DC-DC conversion with thermal resilience. Use Value: Maintains regulation across automotive transients; 25V absolute max VIN withstands load dump spikes without external protection. |
Use Scenario: Powering FPGA core and I/O rails in handheld test equipment with Li-ion (3.0–4.2V) or wall adapter (5–24V) input. IC Role / Device Role / Timing Role: Adjustable-output step-down regulator enabling flexible rail generation from single input source. Use Value: 200kHz–2.4MHz frequency tuning allows optimization for compact size (high f) or efficiency (low f) per battery life requirements. |
| Distributed Supply Regulation | Industrial 24V System Supplies |
Use Scenario: Local point-of-load conversion in PLC backplanes where 24V bus feeds multiple 5V/3.3V subsystems. IC Role / Device Role / Timing Role: Isolated buck stage providing regulated, low-noise supply with PG flag for system health monitoring. Use Value: Power good signal enables centralized power sequencing and fault detection across modular hardware. |
Use Scenario: Converting factory 24V DC supply to 12V for motor drivers or sensors in harsh industrial environments. IC Role / Device Role / Timing Role: Robust primary regulator operating continuously at –40°C to +125°C ambient with thermal shutdown. Use Value: DFN-10 package with exposed pad ensures reliable thermal dissipation without heatsink in enclosed 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 max VIN, 3A max IOUT, 3mm × 4mm MSOP; no integrated boost diode; requires external bootstrap cap | Better suited for higher-input industrial systems (>25V); lacks BD pin bias option for efficiency optimization | Select when input exceeds 25V or when board space allows larger MSOP and external diode |
| MP2315DJ-LF-Z | 24V max VIN, 3A max IOUT, 8-pin SOIC; fixed 500kHz fSW; no SYNC or PG; lower quiescent current (25μA) | Targeted at cost-sensitive consumer applications; missing PG flag and frequency sync limits system-level control | Select for simple, fixed-frequency designs where PG and synchronization are unnecessary |
Compared with LTC3631EMSE#PBF and MP2315DJ-LF-Z, the LT1913IDD#TRPBF uniquely combines 25V input capability, 3.5A output, integrated boost diode, power good flag, and 200kHz–2.4MHz programmability in a thermally optimized 3mm × 3mm DFN-making it optimal for space-constrained, high-reliability industrial and automotive DC-DC stages.
Availability
LT1913IDD#TRPBF is available at Aetrix Electronics and suitable for automotive battery regulation, portable product power, and industrial 24V system supplies requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT1913IDD#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 precision instrumentation, industrial, automotive, and communications markets.
The LT1913IDD#TRPBF belongs to Linear's legacy high-voltage monolithic buck regulator family, designed specifically for rugged, wide-input DC-DC conversion in automotive and industrial environments where reliability, thermal performance, and feature integration are critical.
FAQ
What is the maximum input voltage rating for the LT1913IDD#TRPBF?
The LT1913IDD#TRPBF has an absolute maximum input voltage (VIN) rating of 25V, as specified in the Absolute Maximum Ratings table. It operates continuously over 3.6V to 25V input range. Transient inputs up to 25V are acceptable during normal regulation; however, during startup or overload, the safe maximum VIN depends on switching frequency and minimum on-time - consult the Applications Information section for the VIN(MAX) equation.
Does the LT1913IDD#TRPBF require an external boost diode?
No, the LT1913IDD#TRPBF integrates a Schottky boost diode on-die, connected to the BD pin. This eliminates the need for an external boost diode in standard configurations. The internal diode supports biasing the internal regulator from BD when VBD ≥ 3V, improving light-load efficiency.
How is the switching frequency set on the LT1913IDD#TRPBF?
The switching frequency of the LT1913IDD#TRPBF is set by connecting a resistor (RT) from Pin 10 (RT) to ground. Frequency ranges from 200kHz to 2.4MHz depending on RT value - for example, 63.4kΩ yields 600kHz. A full RT vs. fSW lookup table is provided in Figure 1 of the datasheet.
What is the function of the PG (Power Good) pin on the LT1913IDD#TRPBF?
The PG pin on the LT1913IDD#TRPBF is an open-collector output that signals when the FB pin reaches ≥91% of its regulated 0.790V reference. It remains low until output regulation is established and VIN exceeds 3.6V. An external pull-up resistor is required to generate a logic-high signal for system power sequencing or fault monitoring.
Can the LT1913IDD#TRPBF be synchronized to an external clock?
Yes, the LT1913IDD#TRPBF supports external clock synchronization via the SYNC pin (Pin 6). It accepts TTL/CMOS-compatible square waves from 250kHz to 2MHz. The pin must not be left floating; tie to ground if unused. Synchronization helps reduce EMI in multi-regulator systems by aligning switching edges.
LT1913IDD#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:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-DFN (3x3)
LT1913IDD#TRPBF FAQ
1.How can I place an order for LT1913IDD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1913IDD#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 LT1913IDD#TRPBF reliable?
The price and inventory of LT1913IDD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1913IDD#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1913IDD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1913IDD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1913IDD#TRPBF?
LT1913IDD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1913IDD#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 LT1913IDD#TRPBF?
For technical support, including LT1913IDD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1913IDD#TRPBF requirements.
6.How does Aetrix verify that LT1913IDD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1913IDD#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 LT1913IDD#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1913IDD#TRPBF?
All LT1913IDD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1913IDD#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 LT1913IDD#TRPBF part is unused and in its original packaging.
Return procedure for LT1913IDD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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