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Analog Devices Inc. LT1612EMS8#TRPBF
- Part No.:
- LT1612EMS8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LT1612EMS8#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 500MA 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,956
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Product details
Overview
LT1612EMS8#TRPBF from Analog Devices (formerly Linear Technology) is a synchronous step-down DC/DC converter IC designed for low-input-voltage, high-efficiency power conversion in space-constrained portable systems. It operates from 2V to 5.5V input, delivers up to 500mA output current, features an internal 0.45Ω synchronous switch pair, fixed 800kHz switching frequency, and 620mV feedback reference voltage - enabling precise low-voltage regulation down to 0.9V in applications such as Li-ion-powered microcontrollers and sensors.
For engineers reviewing the LT1612EMS8#TRPBF datasheet, LT1612EMS8#TRPBF pinout, LT1612EMS8#TRPBF application, or LT1612EMS8#TRPBF equivalent, key selection considerations include its Burst Mode™ operation for <160µA no-load quiescent current, MSOP-8 package compatibility with ceramic capacitor designs, MODE pin controllable light-load noise trade-off, and integrated current-mode control architecture requiring only external inductor and RC compensation network.
Technical Context
The LT1612EMS8#TRPBF implements fixed-frequency (700–900kHz typ.) current-mode PWM control with dual feedback loops: an outer voltage loop using the error amplifier (VC pin) and inner cycle-by-cycle peak current limiting via RSENSE sensing. Its internal synchronous rectifier eliminates external Schottky losses and enables >85% efficiency at 500mA across 2V–5.5V input range.
Burst Mode™ operation - activated when MODE pin is grounded - disables oscillator and switch driver between pulses to reduce IQ to 160µA, while pulling MODE ≥2V forces continuous switching for low-noise output. The VC pin serves dual roles: error amplifier output for loop compensation and current limit threshold setting, with grounding forcing switch OFF.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2V to 5.5V - supports single-cell Li-ion (2.7–4.2V), two-cell alkaline (2–3.2V), and 5V-to-3.3V/2.5V/1.2V point-of-load conversion. |
| Output Current | Up to 500mA - enabled by internal 0.45Ω synchronous switches; no external MOSFETs required. |
| Switching Frequency | 800kHz (typ.), 700–900kHz (min–max) - allows use of compact 10µH inductors and ceramic capacitors ≤22µF. |
| Feedback Reference | 620mV ±15mV - sets minimum VOUT = 0.62V × (1 + R1/R2); enables sub-1V regulation with precision resistor divider. |
| Quiescent Current | 160µA (Burst Mode), <1µA (shutdown) - extends battery life in always-on sensor nodes and wearables. |
| Operating Temp | –40°C to 85°C - qualified for industrial and automotive cabin-adjacent environments. |
| Package | 8-Lead MSOP (MS8) - 3mm × 3mm footprint, 0.65mm pitch, θJA = 200°C/W; optimized for thermal performance in thin PCBs. |
Pinout & Package
LT1612EMS8#TRPBF is housed in an 8-lead plastic MSOP (MS8) package with exposed pad for thermal enhancement. Pin 1 (VC) is top-left when notch or mark is oriented up; pin numbering follows standard MSOP convention (counterclockwise).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VC (Pin 1) | Error amplifier output & current limit control | Connect RC network to ground for loop compensation; voltage sets switch current limit; grounding disables switching. |
| FB (Pin 2) | Negative input of error amplifier | Resistor divider tap point; regulates VOUT = 0.62V × (1 + R1/R2); bias current flows out (–7 to –50nA). |
| VIN (Pin 3) | Main power input | Supplies internal circuitry and high-side switch; requires local 0.1µF ceramic bypass within 5mm. |
| GND (Pin 4) | Analog/digital ground reference | Single-point connection to PCB ground plane; ties input capacitor ground to minimize dI/dt noise. |
| SW (Pin 5) | Switch node | Connects to inductor and boost capacitor; high dv/dt node - minimize trace area to reduce EMI. |
| BOOST (Pin 6) | Bootstrap supply for high-side driver | Must be ≥VIN + 1.5V; connect 0.1µF ceramic capacitor from BOOST to SW for gate drive integrity. |
| MODE (Pin 7) | Burst Mode enable/disable control | Ground or float → Burst Mode (high light-load efficiency, ~30mVP-P ripple); ≥2V → continuous mode (low noise). |
| SHDN (Pin 8) | Shutdown control | Pull ≤0.2V for shutdown (<1µA IQ); tie 2–5.5V for normal operation; 10–45µA input current. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous rectification | Integrated 0.45Ω high- and low-side switches eliminate external Schottky loss, enabling >80% efficiency at 10mA load. |
| Ultra-low quiescent current | 160µA in Burst Mode - extends runtime in battery-powered IoT endpoints where average load is <50mA. |
| Ceramic capacitor compatible | No ESR requirement on input/output caps; supports 0.1µF–22µF X5R/X7R ceramics - reduces board area vs. tantalum/electrolytic. |
| Programmable light-load behavior | MODE pin selects between efficiency-optimized Burst Mode or noise-sensitive continuous switching - no firmware or external logic needed. |
| Robust current-mode control | Internal slope compensation and cycle-by-cycle current limiting ensure stability with wide VIN/VOUT ranges and varying inductor DCR. |
Applications
| Portable Medical Sensors | Li-ion Powered Microcontrollers |
|---|---|
Use Scenario: Continuous glucose monitor (CGM) with ultra-low-power BLE SoC and analog front-end running from single Li-ion cell. IC Role / Device Role / Timing Role: Primary step-down regulator converting 2.7–4.2V battery to stable 1.8V for RF transceiver and 3.3V for MCU core. Use Value: 160µA Burst Mode IQ preserves battery capacity over multi-day wear; MSOP-8 fits tight 12mm × 12mm PCB area. |
Use Scenario: Industrial temperature sensor node with ARM Cortex-M0+ MCU, ADC, and LoRaWAN radio operating off 2-cell alkaline. IC Role / Device Role / Timing Role: Main power supply stepping 2.0–3.2V alkaline stack to regulated 3.3V for digital logic and 1.2V for analog subsystem. Use Value: 2V minimum input enables full battery utilization; 800kHz switching avoids AM radio band interference. |
| Wearable Fitness Trackers | Low-Voltage FPGA I/O Banks |
Use Scenario: Optical heart-rate monitor with photodiode array, LED drivers, and motion sensor powered by coin cell or thin-film battery. IC Role / Device Role / Timing Role: Efficient 3.0V-to-1.2V conversion for sensor interface ASIC with dynamic load ranging 100µA–200mA. Use Value: MODE pin toggles between Burst Mode (sleep state) and continuous mode (active measurement) - no software overhead. |
Use Scenario: Edge AI inference module using Lattice iCE40UP FPGA with configurable I/O banks requiring 1.2V, 1.8V, and 3.3V rails. IC Role / Device Role / Timing Role: Dedicated 1.2V rail generator for FPGA core logic, synchronized to system clock domain via clean SW node routing. Use Value: Internal synchronous switches eliminate body diode conduction loss - critical for maintaining 1.2V ±3% under 500mA pulsed loads. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3404EMS8#TRPBF | 1.4MHz switching, 10µA IQ, 600mA output, same MSOP-8 package | Better suited for higher-frequency, lower-inductance designs; lower IQ improves multi-year battery life but less optimal below 2.5V input | Choose LTC3404 if input ≥2.65V and board space demands smallest possible inductor; LT1612EMS8#TRPBF remains preferred for true 2V start-up. |
| LTC1772ES6#TRMPBF | SOT-23-6 package, 1.5MHz, 500mA, 50µA IQ, requires external MOSFETs | Higher design complexity due to discrete FETs; better thermal dissipation at full load but larger total solution size | Select LTC1772 only when >500mA peak current or >85°C ambient is required; LT1612EMS8#TRPBF offers simpler BOM and smaller footprint for ≤500mA. |
Compared with LTC3404EMS8#TRPBF and LTC1772ES6#TRMPBF, the LT1612EMS8#TRPBF uniquely balances 2V start-up capability, integrated synchronous switches, and MSOP-8 compactness - making it the optimal choice for cost-sensitive, battery-voltage-limited applications where layout simplicity and minimal external components are critical.
Availability
LT1612EMS8#TRPBF is available at Aetrix Electronics and suitable for portable medical sensors, Li-ion powered microcontrollers, wearable fitness trackers, and low-voltage FPGA I/O banks requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for LT1612EMS8#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 full product continuity, technical documentation, and manufacturing for legacy Linear regulators including the LT1612 family.
The LT1612EMS8#TRPBF belongs to Linear's precision monolithic DC/DC converter product line, engineered specifically for ultra-low-voltage, high-efficiency power management in battery-operated portable electronics where input voltage can dip below 2.5V.
FAQ
What is the minimum input voltage supported by the LT1612EMS8#TRPBF?
The LT1612EMS8#TRPBF supports a minimum input voltage of 2V, verified across the full –40°C to 85°C operating temperature range. This enables reliable startup and regulation from deeply discharged single-cell Li-ion batteries (down to 2.0V) and two-cell alkaline sources, distinguishing it from many competing regulators with 2.5V or higher minimum VIN.
Does the LT1612EMS8#TRPBF require an external Schottky diode?
No, the LT1612EMS8#TRPBF does not require an external Schottky diode because it integrates synchronous high-side and low-side MOSFET switches. These internal 0.45Ω switches replace the need for an external rectifier, improving efficiency by eliminating forward voltage drop losses and reducing thermal stress in compact layouts.
How does the MODE pin affect light-load efficiency and output noise in the LT1612EMS8#TRPBF?
When the MODE pin of the LT1612EMS8#TRPBF is grounded or floating, Burst Mode™ activates - reducing quiescent current to 160µA but introducing ~30mVP-P low-frequency output ripple. Pulling MODE ≥2V disables Burst Mode, forcing continuous 800kHz switching and eliminating low-frequency ripple at the expense of higher light-load IQ (~2mA).
What is the recommended output capacitor type and value for stable operation of the LT1612EMS8#TRPBF?
The LT1612EMS8#TRPBF is optimized for ceramic output capacitors; typical designs use 10µF to 68µF X5R or X7R types (e.g., TAIYO-YUDEN LMK325BJ106MN or PANASONIC EEFCDOF680R). Unlike traditional buck controllers, it imposes no minimum ESR requirement, enabling small-size, low-ESR ceramics that improve transient response and reduce board area.
Can the LT1612EMS8#TRPBF regulate output voltages below 1.0V?
Yes, the LT1612EMS8#TRPBF can regulate output voltages as low as 0.62V - the value of its internal feedback reference - by configuring the resistor divider so that VOUT = 0.62V × (1 + R1/R2). Application circuits demonstrate stable 0.9V and 1.2V outputs; achieving sub-0.9V requires precision resistors and careful layout to minimize FB pin leakage effects.
LT1612EMS8#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- 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):
- 2V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 0.62V
- Voltage - Output (Max):
- 4.95V
- Current - Output:
- 500mA
- Frequency - Switching:
- 800kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-MSOP
LT1612EMS8#TRPBF FAQ
1.How can I place an order for LT1612EMS8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1612EMS8#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 LT1612EMS8#TRPBF reliable?
The price and inventory of LT1612EMS8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1612EMS8#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1612EMS8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1612EMS8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1612EMS8#TRPBF?
LT1612EMS8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1612EMS8#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 LT1612EMS8#TRPBF?
For technical support, including LT1612EMS8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1612EMS8#TRPBF requirements.
6.How does Aetrix verify that LT1612EMS8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1612EMS8#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 LT1612EMS8#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1612EMS8#TRPBF?
All LT1612EMS8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1612EMS8#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 LT1612EMS8#TRPBF part is unused and in its original packaging.
Return procedure for LT1612EMS8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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