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Analog Devices Inc. LT1913IDD#PBF
- Part No.:
- LT1913IDD#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LT1913IDD#PBF.pdf
- Description:
- IC REG BUCK ADJ 3.5A 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,466
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Product details
Overview
LT1913IDD#PBF from Analog Devices (formerly Linear Technology) is a monolithic current-mode step-down switching regulator with integrated 95mΩ NPN power switch and boost Schottky diode, supporting 3.6V–25V input, 0.79V–25V adjustable output, and up to 3.5A continuous load in automotive battery regulation and portable power systems.
For engineers reviewing the LT1913IDD#PBF datasheet, LT1913IDD#PBF pinout, LT1913IDD#PBF application, or LT1913IDD#PBF equivalent, this page delivers verified specifications including 200kHz–2.4MHz programmable frequency, power good flag, soft-start via RUN/SS, thermal protection, and DFN-10 (3mm × 3mm) package with exposed GND pad for low θJA = 45°C/W.
Technical Context
The LT1913IDD#PBF implements constant-frequency current-mode control using an internal transconductance error amplifier (525 μ℧), oscillator synchronized via RT resistor or external clock (250kHz–2MHz), and VC-pin-based peak-current limiting with active clamp. Its bipolar NPN switch is driven by a BOOST-supplied voltage > VIN, enabling full saturation at high duty cycles.
Operation includes frequency foldback during startup/overload, 91% power-good threshold referenced to 0.790V FB, and dual bias sourcing: from VIN or externally via BD pin ≥3V to improve efficiency. Minimum on/off times (~150ns) constrain practical duty cycle range and maximum input voltage per selected fSW.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.6V to 25V - supports wide-range industrial and automotive supplies without pre-regulation |
| Output Current | Up to 3.5A continuous - sufficient for core logic rails and FPGA I/O banks |
| Switching Frequency | 200kHz to 2.4MHz - selectable via RT resistor; enables tradeoff between inductor size and efficiency |
| Feedback Reference | 0.790V ±15mV - sets output voltage accuracy and enables low-VOUT designs down to 0.79V |
| Power Good Flag | Open-collector PG asserts when VOUT ≥ 91% of programmed value - provides reliable system power sequencing signal |
| Shutdown Current | <1μA - enables ultra-low-power standby in battery-powered devices |
| Thermal Protection | Internal junction shutdown - prevents damage during sustained overload or poor PCB heatsinking |
| Package | 10-Lead 3mm × 3mm DFN with exposed GND pad - achieves θJA = 45°C/W for high-power density layouts |
Pinout & Package
LT1913IDD#PBF uses a 10-lead plastic DFN (3mm × 3mm) with exposed pad (Pin 11) soldered to PCB ground for thermal and electrical integrity. Pin pitch is 0.5mm; recommended footprint matches Linear Technology's standard DFN-10 layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BD (Pin 1) | Bias Diode Anode | Connects to boost Schottky anode; supplies current to internal bias regulator when ≥3V |
| BOOST (Pin 2) | Boost Drive Voltage | Provides >VIN gate drive to NPN switch; must be ≥2.3V above SW for full saturation |
| SW (Pin 3) | Switch Node | High-side switch output; connects to inductor, catch diode, and boost capacitor |
| VIN (Pin 4) | Main Input Supply | Primary power source for switch and internal regulator; requires local 10μF ceramic bypass |
| RUN/SS (Pin 5) | Enable & Soft-Start Control | Logic-level enable (≥2.5V = ON); RC ramp here controls output voltage slew rate |
| SYNC (Pin 6) | External Clock Input | Accepts TTL/CMOS clock (250kHz–2MHz); grounds when unused to prevent floating |
| PG (Pin 7) | Power Good Output | Open-collector flag; pulled high externally when VFB ≥ 91% of 0.790V |
| FB (Pin 8) | Feedback Input | Sense node regulated to 0.790V; connects to resistor divider from VOUT |
| VC (Pin 9) | Error Amplifier Output | Controls peak switch current; RC network here sets loop compensation |
| RT (Pin 10) | Oscillator Timing | Resistor-to-ground 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 board area in compact designs |
| Saturating NPN Switch (95mΩ) | Enables high-efficiency operation at high duty cycles (>70%) without MOSFET gate-drive complexity |
| Programmable Soft-Start | Controlled VOUT ramp via RUN/SS RC network prevents inrush current and output overshoot |
| Current-Mode Control | Provides inherent cycle-by-cycle current limiting and fast transient response without slope compensation |
| Thermal Shutdown with Hysteresis | Protects device under sustained overload; automatic recovery after cooldown avoids latch-up |
| Exposed Pad Thermal Path | Low-thermal-resistance GND connection (θJC = 10°C/W) enables 3.5A operation in 3mm × 3mm footprint |
Applications
| Automotive Battery Regulation | Portable Product Power |
|---|---|
Use Scenario: Regulating 12V/24V vehicle battery to 3.3V or 5V for infotainment MCU and sensors. IC Role / Device Role / Timing Role: Primary buck converter delivering stable, ripple-controlled supply with load dump tolerance. Use Value: Wide 3.6V–25V input handles cold-crank (6.5V) and load-dump (40V transient clamped externally) conditions. |
Use Scenario: Powering ARM Cortex-M7 SoC and LPDDR3 memory in handheld medical diagnostic device. IC Role / Device Role / Timing Role: High-efficiency point-of-load regulator with soft-start to avoid brownout during wake-up. Use Value: 3.5A capability and <1μA shutdown current extend battery life while supporting burst-mode processing loads. |
| Distributed Supply Regulation | Industrial Sensor Node Power |
Use Scenario: Generating isolated 12V and 5V rails from 24V factory bus for PLC I/O modules. IC Role / Device Role / Timing Role: Compact, thermally robust DC-DC stage replacing larger discrete solutions. Use Value: Synchronizable switching (250kHz–2MHz) minimizes EMI coupling across multiple regulators on same board. |
Use Scenario: Providing 3.3V rail for low-power wireless sensor (LoRaWAN/NB-IoT) with 10-year battery target. IC Role / Device Role / Timing Role: Always-on regulator with precise enable control and power-good signaling to microcontroller. Use Value: 0.790V reference enables accurate feedback even with 1% resistors; PG flag validates supply before radio transmit. |
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 input, 3A output, integrated MOSFETs, 3mm × 4mm MSOP; no BOOST pin or BD bias option | Better suited for higher-input industrial systems; lacks bipolar switch efficiency at high duty cycle | Select when input exceeds 25V or MOSFET architecture preferred over bipolar |
| MP2332HGTL-Z | 24V max input, 3.5A, 500kHz–2.5MHz, 2mm × 2mm QFN; no PG flag or SYNC input | Smaller footprint but missing power sequencing and synchronization features critical for multi-rail systems | Select for space-constrained consumer designs where PG/SYNC are unnecessary |
Compared with LTC3631EMSE#PBF and MP2332HGTL-Z, the LT1913IDD#PBF uniquely combines bipolar switch efficiency at high duty cycle, integrated boost diode, power good flag, and synchronization-making it optimal for automotive and industrial multi-rail systems requiring reliability and design flexibility.
Availability
LT1913IDD#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 (–40°C to 125°C).
Supply support for LT1913IDD#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, communications, and industrial markets.
The LT1913IDD#PBF belongs to Linear's legacy high-voltage buck regulator family, designed specifically for rugged, wide-input applications in automotive, industrial, and portable electronics where reliability and thermal performance are critical.
FAQ
What is the maximum input voltage rating for LT1913IDD#PBF?
The absolute maximum input voltage at the VIN pin is 25V, and the BOOST pin withstands up to 50V. For continuous operation, the LT1913IDD#PBF supports 3.6V to 25V input. During startup or overload, the safe maximum VIN depends on switching frequency and minimum on-time; for example, at 2.4MHz, VIN must stay below ~15V to avoid violating tON(MIN). In steady-state regulation, 25V transients are acceptable if clamped externally.
Does LT1913IDD#PBF require an external catch diode?
No, the LT1913IDD#PBF integrates a boost Schottky diode connected to the BD pin and does not require an external catch diode. However, an external Schottky diode is still needed between SW and ground (or output) to provide the freewheeling path during switch-off. The internal diode only serves the boost capacitor charging function-not the main power path.
How is the switching frequency set on LT1913IDD#PBF?
The switching frequency of LT1913IDD#PBF is set by connecting a resistor (RT) from Pin 10 (RT) to ground. Values range from 9.09kΩ (2.4MHz) to 215kΩ (200kHz), with common values like 63.4kΩ yielding 600kHz. The RT resistor directly programs the oscillator; no external capacitor is required. Frequency can also be synchronized to an external clock applied to the SYNC pin (250kHz–2MHz).
What is the purpose of the BD pin on LT1913IDD#PBF?
The BD (Bias Diode) pin on LT1913IDD#PBF connects to the anode of the internal boost Schottky diode and supplies current to the internal bias regulator. When a ≥3V external voltage (e.g., from VOUT) is applied to BD, the LT1913IDD#PBF draws bias power from BD instead of VIN-improving conversion efficiency by reducing quiescent current drawn from the high-voltage input rail.
Can LT1913IDD#PBF operate in dropout mode?
No, the LT1913IDD#PBF is a non-synchronous buck regulator and cannot operate in dropout (100% duty cycle). Its minimum off-time (~150ns) limits maximum duty cycle; for example, at 600kHz, DMAX ≈ 91%. If VIN drops near VOUT, output regulation fails. For true dropout operation, a linear regulator or LDO is required downstream-or a different topology such as a buck-boost.
LT1913IDD#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:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-DFN (3x3)
LT1913IDD#PBF FAQ
1.How can I place an order for LT1913IDD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1913IDD#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 LT1913IDD#PBF reliable?
The price and inventory of LT1913IDD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1913IDD#PBF is usually 5 days.
3.What payment methods are accepted for LT1913IDD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1913IDD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1913IDD#PBF?
LT1913IDD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1913IDD#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 LT1913IDD#PBF?
For technical support, including LT1913IDD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1913IDD#PBF requirements.
6.How does Aetrix verify that LT1913IDD#PBF is sourced from the original manufacturer or authorized distributors?
All LT1913IDD#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 LT1913IDD#PBF meets industry standards.
7.What is the process for return or replacement of LT1913IDD#PBF?
All LT1913IDD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1913IDD#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 LT1913IDD#PBF part is unused and in its original packaging.
Return procedure for LT1913IDD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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