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Analog Devices Inc. LT1912EMSE#TRPBF
- Part No.:
- LT1912EMSE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT1912EMSE#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 2A 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,047
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Product details
Overview
LT1912EMSE#TRPBF from Analog Devices (formerly Linear Technology) is a monolithic 36V, 2A, current-mode step-down switching regulator in thermally enhanced 10-pin MSOP package. It integrates a 0.25Ω NPN switch, boost Schottky diode, oscillator, error amplifier, and soft-start control. Designed for automotive battery regulation and industrial supplies, it delivers up to 2A output with adjustable 200–500kHz switching frequency and 0.790V feedback reference.
For engineers reviewing the LT1912EMSE#TRPBF datasheet, LT1912EMSE#TRPBF pinout, LT1912EMSE#TRPBF application, or LT1912EMSE#TRPBF equivalent, key selection criteria include input voltage range (3.6V–36V), integrated boost diode, thermal performance in MSOP-10 with exposed pad, current limit behavior across temperature, and synchronization capability between 250kHz–500kHz.
Technical Context
The LT1912EMSE#TRPBF implements constant-frequency current-mode control using an internal transconductance error amplifier (25 µmho) and slope compensation. Its oscillator frequency is resistor-programmed via the RT pin (200–500kHz), with foldback during low FB voltage to limit startup/overload current.
It uses bipolar NPN switch architecture driven by BOOST pin voltage > SW pin by ≥2.3V, requiring external boost capacitor and internal Schottky diode. The VC pin serves as error amplifier output and peak current control node, clamped to RUN/SS during soft-start and limited to 2V maximum.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.6V to 36V - supports wide-range industrial and automotive inputs without pre-regulation |
| Max Output Current | 2A - sustained continuous load capability with thermal derating per junction temp |
| Switch On-Resistance | 0.25Ω - enables high efficiency at 2A with <500mV saturation drop |
| Feedback Reference | 0.790V ±10mV - sets output voltage accuracy and enables precise resistor-divider programming |
| Shutdown Quiescent Current | <1µA - minimizes system standby power loss when RUN/SS is grounded |
| Switching Frequency Range | 200kHz to 500kHz - adjustable via RT resistor; synchronizable 250–500kHz for EMI control |
| Min Switch Off-Time | 150ns - constrains maximum duty cycle and defines minimum input voltage at high fSW |
| Junction Temp Range | –40°C to 125°C - qualified for automotive and harsh industrial environments |
Pinout & Package
LT1912EMSE#TRPBF is housed in a 10-lead plastic MSOP package with exposed thermal pad (Pin 11 = GND). The exposed pad must be soldered to PCB for thermal performance (θJA = 45°C/W, θJC = 10°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BD (Pin 1) | Bias Diode Anode | Connects to boost Schottky anode; supplies bias current to internal regulator - improves efficiency when tied to regulated output |
| BOOST (Pin 2) | Boost Drive Voltage | Provides >VIN drive to NPN switch base; must exceed SW by ≥2.3V for full saturation |
| SW (Pin 3) | Switch Collector Output | Connects to inductor, catch diode cathode, and boost capacitor - carries full switched current |
| VIN (Pin 4) | Main Power Input | Supplies internal regulator and switch; requires local ceramic bypass (≥4.7µF X7R) |
| 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 edges (rise/fall <1µs) to synchronize switching frequency |
| N/C (Pin 7) | No Connect | Must be tied to GND - not internally connected |
| FB (Pin 8) | Feedback Sense | Regulated to 0.790V; connects to resistor divider tap - determines output voltage setpoint |
| VC (Pin 9) | Error Amplifier Output | Controls peak switch current; used for loop compensation with RC network to GND |
| RT (Pin 10) | Oscillator Timing | Resistor-to-GND sets switching frequency (e.g., 68.1kΩ = 500kHz) |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Boost Schottky Diode | Eliminates external boost diode, reducing BOM count and PCB area in buck converter designs |
| Thermally Enhanced MSOP-10 | Exposed pad enables low thermal resistance (θJC = 10°C/W) for reliable 2A operation without heatsink |
| Current Mode Control | Provides inherent cycle-by-cycle current limiting and fast transient response without external compensation components |
| Adjustable Soft-Start | RC network on RUN/SS pin allows controlled VOUT ramp to prevent inrush current and overshoot |
| Synchronizable Switching | Enables noise-sensitive systems (e.g., RF, audio) to lock switching to external clock and avoid beat frequencies |
| Wide Input Range Operation | Supports direct connection to 24V/36V industrial rails and 12V automotive batteries with cold-crank tolerance |
Applications
| Automotive Battery Regulation | Industrial Power Supplies |
|---|---|
Use Scenario: Regulating 12V/24V vehicle battery to stable 3.3V or 5V for infotainment ECUs and ADAS sensors. IC Role / Device Role / Timing Role: Primary step-down regulator handling load dumps, cold-crank transients, and wide input variation. Use Value: 3.6V–36V input range and –40°C to 125°C rating ensure uninterrupted operation under automotive stress conditions. | Use Scenario: Distributed 5V/3.3V generation from 24V or 48V factory bus in PLC I/O modules and motor drives. IC Role / Device Role / Timing Role: Local DC-DC converter delivering clean, regulated power to microcontrollers and analog front-ends. Use Value: Integrated boost diode and 0.25Ω switch enable compact, high-efficiency solution with minimal external components. |
| Set-Top Box Power | Wall Transformer Replacement |
Use Scenario: Replacing linear regulators in cable/satellite STB mainboard power domains requiring 1.2V–5V at ≤2A. IC Role / Device Role / Timing Role: High-efficiency buck converter minimizing heat buildup in enclosed plastic enclosures. Use Value: <1µA shutdown current and ceramic-capacitor compatibility reduce standby power and board space vs. legacy solutions. | Use Scenario: Embedded AC/DC adapter replacement in medical or test equipment needing isolated 5V/12V outputs. IC Role / Device Role / Timing Role: Secondary-side synchronous buck controller accepting wide-input unregulated DC from flyback output. Use Value: Adjustable 200–500kHz frequency allows optimization for size (high fSW) or efficiency (low fSW) per mechanical constraints. |
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#TRPBF | Higher 36V input, 1.5A output; integrated MOSFETs (no external diode needed); 3mm × 4mm MSOP | Lower max current but superior light-load efficiency via Burst Mode; better for battery-powered systems | Select LTC3631EMSE#TRPBF when lower quiescent current (<20µA) and no external catch diode are priorities |
| LM5164QPWPRQ1 | 42V input, 0.6A output; integrated high-side MOSFET; 1.5MHz max frequency; AEC-Q100 Grade 1 | Higher frequency enables smaller magnetics; lower current rating limits use to sub-1A loads | Select LM5164QPWPRQ1 when AEC-Q100 qualification and ultra-compact layout (1.5MHz) outweigh need for 2A output |
Compared with LTC3631EMSE#TRPBF and LM5164QPWPRQ1, the LT1912EMSE#TRPBF uniquely balances 2A output, 36V input, integrated boost diode, and MSOP thermal performance - making it optimal for cost-sensitive, thermally constrained 2A industrial and automotive buck applications where external diode integration is acceptable.
Availability
LT1912EMSE#TRPBF is available at Aetrix Electronics and suitable for automotive battery regulation, industrial power supplies, and set-top box power conversion requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LT1912EMSE#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 high-performance power management portfolio with rigorous automotive and industrial qualification standards.
The LT1912EMSE#TRPBF belongs to Linear's monolithic current-mode buck regulator family, designed specifically for wide-input, medium-current applications where thermal efficiency, reliability under voltage transients, and minimal external component count are critical.
FAQ
What is the maximum output current capability of the LT1912EMSE#TRPBF under continuous operation?
The LT1912EMSE#TRPBF delivers up to 2A continuous output current under typical conditions (TA = 25°C, VIN = 12V, VOUT = 3.3V, fSW = 500kHz). Actual current depends on thermal design: junction temperature must remain ≤125°C. With proper PCB copper area and exposed pad soldering, full 2A is achievable at ambient ≤85°C. Derating applies above that - e.g., ~1.5A at 100°C ambient.
Does the LT1912EMSE#TRPBF require an external boost diode?
No, the LT1912EMSE#TRPBF integrates a boost Schottky diode internally (connected to BD pin). This eliminates the need for an external boost diode in standard configurations. The BD pin supplies bias current to the internal regulator and must be connected to the anode of the external boost capacitor. External Schottky diodes are only required for special cases like 2.5V outputs per datasheet Figure 4b.
How is the switching frequency set on the LT1912EMSE#TRPBF?
The switching frequency of the LT1912EMSE#TRPBF is set by a resistor (RT) connected from Pin 10 (RT) to GND. Values range from 68.1kΩ (500kHz) to 187kΩ (200kHz). The device also supports external synchronization via Pin 6 (SYNC) over 250–500kHz - useful for EMI reduction in noise-sensitive systems. Frequency foldback occurs below normal regulation to limit current during startup or overload.
What is the purpose of the exposed pad on the LT1912EMSE#TRPBF MSOP package?
The exposed pad (Pin 11) on the LT1912EMSE#TRPBF MSOP package is electrically and thermally connected to GND. It must be soldered to a large PCB copper area to achieve specified thermal performance: θJA = 45°C/W and θJC = 10°C/W. Failure to solder this pad results in excessive junction temperature rise, potential thermal shutdown, and reduced reliability - especially under 2A load conditions.
Can the LT1912EMSE#TRPBF operate with a 3.3V input supply?
No, the LT1912EMSE#TRPBF has a minimum operating input voltage of 3.6V (typical) per datasheet Absolute Maximum Ratings and Electrical Characteristics. At 3.3V, the internal regulator cannot sustain bias, the switch cannot saturate reliably, and the device will not start or regulate. For 3.3V-input applications, consider alternatives such as the LTC3631 or LM5164 series, which support lower VIN thresholds.
LT1912EMSE#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) 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-MSOP-EP
LT1912EMSE#TRPBF FAQ
1.How can I place an order for LT1912EMSE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1912EMSE#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 LT1912EMSE#TRPBF reliable?
The price and inventory of LT1912EMSE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1912EMSE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1912EMSE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1912EMSE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1912EMSE#TRPBF?
LT1912EMSE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1912EMSE#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 LT1912EMSE#TRPBF?
For technical support, including LT1912EMSE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1912EMSE#TRPBF requirements.
6.How does Aetrix verify that LT1912EMSE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1912EMSE#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 LT1912EMSE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1912EMSE#TRPBF?
All LT1912EMSE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1912EMSE#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 LT1912EMSE#TRPBF part is unused and in its original packaging.
Return procedure for LT1912EMSE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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