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Analog Devices Inc. LT1619EMS8#TRPBF
- Part No.:
- LT1619EMS8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LT1619EMS8#TRPBF.pdf
- Description:
- IC REG CTRLR MULT TOPOLOGY 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,442
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Product details
Overview
LT1619EMS8#TRPBF from Analog Devices (formerly Linear Technology) is a fixed-frequency current-mode PWM controller for low-side N-channel MOSFET–driven DC/DC converters, operating from 1.9V to 18V input, featuring 300kHz internal oscillator, 53mV current sense threshold, and Burst Mode operation. It supports boost, SEPIC, and flyback topologies in battery-powered and distributed power supplies.
For engineers reviewing the LT1619EMS8#TRPBF datasheet, LT1619EMS8#TRPBF pinout, LT1619EMS8#TRPBF application, or LT1619EMS8#TRPBF equivalent, key selection considerations include its rail-to-rail 1A N-channel driver, 140µA quiescent current, 15µA shutdown current, external synchronization up to 500kHz, and MSOP-8 package compatibility with thermal constraints in compact power designs.
Technical Context
The LT1619EMS8#TRPBF implements current-mode control using an internal 300kHz oscillator with slope compensation derived from the timing ramp, and features leading-edge blanking (280ns) to suppress gate-charge transients at switch turn-on. Its error amplifier delivers 80–260 µ℧ transconductance and clamps VC between 1.6V–2.2V.
It integrates a dedicated current-sense amplifier with –120µA typical input bias current and a separate comparator for cycle-by-cycle current limiting at 53mV, independent of duty cycle. The S/S pin serves dual function: active-low shutdown (0.45V threshold, 17µs delay) and external synchronization (370–500kHz pulse train).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 1.9V to 18V - enables direct operation from single Li-ion, multi-cell alkaline, or 12V industrial rails without pre-regulation. |
| Switching Frequency | 300kHz fixed (±80kHz over temp) - balances EMI, inductor size, and efficiency for compact 3.3V→5V or 5V→12V converters. |
| Current Sense Threshold | 53mV (typ) - sets precise peak switch current limit; allows RSENSE ≥ 26.5mΩ for 2A max switch current with margin. |
| Quiescent Current | 140µA (typ) - minimizes no-load power loss in always-on battery systems like IoT sensors or backup rails. |
| Shutdown Current | 15µA (typ) - ensures ultra-low standby drain during system sleep modes without external disconnect switches. |
| MOSFET Driver Output | ±1.5A peak - drives low-side N-MOSFETs with ≤60nC gate charge directly; supports bootstrapped DRV for 3.3V-input boost applications. |
| Reference Voltage | 1.24V (±2%) - sets output voltage accuracy via FB divider; enables stable 3.3V, 5V, or adjustable outputs with <0.05%/V line regulation. |
Pinout & Package
LT1619EMS8#TRPBF is housed in an 8-lead MSOP package (3mm × 3mm, 0.65mm pitch), thermally enhanced with exposed pad (EP) connected to GND for θJA = 120°C/W. Pin 1 is S/S (Shutdown/Sync), Pin 4 is GND, Pin 8 is VIN - layout requires local high-frequency bypassing of VIN to GND and Kelvin connection of SENSE to RSENSE ground.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| S/S (Pin 1) | Shutdown enable / Sync input | Active-low shutdown (0.45V threshold); accepts 370–500kHz external clock pulses for EMI reduction or channel synchronization. |
| FB (Pin 2) | Inverting input of error amplifier | Connects to resistor divider tap; regulates VOUT = 1.24V × (1 + R1/R2); bias current ≤25nA enables high-impedance dividers. |
| VC (Pin 3) | Error amplifier output / Compensation node | Drives loop compensation network (RC to GND); voltage reflects required peak inductor current; clamped 1.6–2.2V. |
| GND (Pin 4) | Analog and power ground reference | Must connect to low-impedance local ground plane; shared return for SENSE, FB, and VC networks to avoid noise coupling. |
| SENSE (Pin 5) | Current sense amplifier input | Monitors voltage across low-side RSENSE; includes 280ns leading-edge blanking; input bias –120µA affects offset in precision sensing. |
| GATE (Pin 6) | MOSFET gate driver output | Delivers ±1.5A peak to drive N-MOSFET gate; rise/fall times ≤35ns into 3.3nF load; low-level output ≤200mV @ 20mA. |
| DRV (Pin 7) | Gate driver supply rail | Connected to VIN (non-bootstrapped) or VOUT (bootstrapped); defines gate drive voltage range and slew capability. |
| VIN (Pin 8) | Main power input | Supplies internal bias circuits and non-bootstrapped DRV; requires ceramic bypass capacitor ≤1cm from pin to GND. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode® operation | Reduces light-load switching frequency dynamically to maintain >85% efficiency down to ~1mA output current, minimizing idle power loss. |
| Rail-to-rail 1A N-channel driver | Enables direct drive of logic-level MOSFETs without external buffers; supports bootstrapped DRV for full enhancement at low VIN (e.g., 3.3V→5V). |
| Internal current sense amplifier with blanking | 280ns blanking window eliminates false triggering from MOSFET gate-charge spikes, improving stability in high-dV/dt layouts. |
| External synchronization up to 500kHz | Allows EMI spread-spectrum alignment or multi-phase interleaving without modifying internal oscillator components. |
| Undervoltage lockout (UVLO) | 1.85V turn-on / 1.65V hysteresis prevents erratic startup during brownout; S/S pin can extend UVLO threshold using external zener. |
Applications
| Portable Medical Sensors | Industrial IoT Edge Nodes |
|---|---|
Use Scenario: Wearable glucose monitor powered by coin-cell battery requiring regulated 3.3V rail from 2.0–3.6V input. IC Role / Device Role / Timing Role: LT1619EMS8#TRPBF acts as current-mode boost controller driving low-side NMOS; provides stable 3.3V output with Burst Mode extending battery life beyond 1 year. Use Value: 140µA quiescent current and 15µA shutdown minimize self-discharge; 53mV current sense enables accurate current limiting with 0.02Ω RSENSE for safety-critical current monitoring. | Use Scenario: Wireless vibration sensor node in factory automation, harvesting energy from piezoelectric source (0.5–5V pulsating) into 3.3V storage rail. IC Role / Device Role / Timing Role: LT1619EMS8#TRPBF configures as SEPIC converter to regulate bidirectional input; handles wide VIN transients while maintaining constant 3.3V for MCU and radio. Use Value: 1.9V minimum start-up enables operation below diode drop; 300kHz fixed frequency simplifies EMI filtering; S/S pin used for microcontroller-controlled shutdown during data transmission gaps. |
| Isolated Telecom Power | Automotive Body Control Modules |
Use Scenario: Auxiliary 5V rail in 48V telecom system using flyback topology with optocoupler feedback for primary-side regulation. IC Role / Device Role / Timing Role: LT1619EMS8#TRPBF controls low-side primary switch; FB referenced to secondary via optocoupler; DRV tied to primary VIN for simplicity. Use Value: 18V max VIN accommodates reflected flyback voltage spikes; 125°C junction rating supports high-temperature chassis mounting; 500kHz sync capability aligns switching with master clock to reduce conducted EMI. | Use Scenario: 12V→5V/3.3V power for LIN bus transceiver and microcontroller in automotive door module, surviving load dump and cold crank. IC Role / Device Role / Timing Role: LT1619EMS8#TRPBF operates as boost converter during cold-crank (VIN dips to 3.5V); uses external zener on S/S to raise UVLO to 6V for robust start-up. Use Value: Wide 1.9–18V input range covers cold-crank (3.5V) to load-dump (28V); 120°C/W thermal resistance enables operation without heatsink in confined space; MSOP-8 footprint fits tight PCB real estate. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar current-mode PWM controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5122MMX/NOPB | Higher VIN (4.5–65V), integrated high-side driver, no Burst Mode, 500kHz max freq | Requires external bootstrap for high-side FET; better suited for high-VIN industrial supplies than low-VIN battery apps | Select LM5122MMX/NOPB only when input exceeds 18V or high-side topology is mandatory; not drop-in for LT1619EMS8#TRPBF's low-VIN use cases. |
| TPS40210DGQ | 1.5–52V input, external N-MOSFET driver, 100–1000kHz adjustable freq, no integrated blanking | Lacks leading-edge blanking and Burst Mode; requires external RC filter for noise immunity; higher quiescent current (2.5mA) | Choose TPS40210DGQ when programmable frequency or wider VIN is critical; accept added layout complexity and reduced light-load efficiency vs. LT1619EMS8#TRPBF. |
Compared with LM5122MMX/NOPB and TPS40210DGQ, the LT1619EMS8#TRPBF delivers superior light-load efficiency via Burst Mode, lower quiescent current, and built-in blanking-making it optimal for battery-constrained, low-input-voltage DC/DC designs where size and standby power dominate.
Availability
LT1619EMS8#TRPBF is available at Aetrix Electronics and suitable for portable medical sensors, industrial IoT edge nodes, isolated telecom power, and automotive body control modules requiring stable component supply, long-lifecycle support, and guaranteed traceability.
Supply support for LT1619EMS8#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. (ADI) is a global semiconductor leader specializing in high-performance analog, mixed-signal, and power management ICs for precision, reliability, and efficiency-critical applications.
The LT1619EMS8#TRPBF belongs to ADI's legacy Linear Technology power controller family, designed specifically for compact, high-efficiency current-mode DC/DC conversion in space- and power-constrained systems.
FAQ
What is the minimum input voltage required for LT1619EMS8#TRPBF to start switching?
The LT1619EMS8#TRPBF guarantees startup at 1.85V input voltage, enforced by an internal undervoltage lockout (UVLO) comparator. Below this threshold, the device remains in shutdown with only 140µA quiescent draw. Startup behavior is verified across temperature and process corners per datasheet Note 2, and the actual turn-on point is typically 1.85V ±0.2V.
Can LT1619EMS8#TRPBF drive a high-side N-channel MOSFET?
No, the LT1619EMS8#TRPBF is designed exclusively for low-side N-channel MOSFET configurations in boost, SEPIC, and flyback topologies. Its GATE pin is a low-side driver with ground-referenced output; it lacks high-side floating supply or level-shifting circuitry. Attempting high-side drive will result in incomplete gate enhancement and unreliable switching.
How does Burst Mode® operation improve efficiency in LT1619EMS8#TRPBF?
Burst Mode® in the LT1619EMS8#TRPBF disables switching cycles when output load falls below ~1mA, reducing average input current to 140µA. Each burst delivers full-energy packets at nominal 300kHz, avoiding the high switching losses of continuous DCM. This raises light-load efficiency from ~40% (continuous mode) to >85% at 100µA load, as confirmed in Figure 1 efficiency curves.
What is the purpose of the DRV pin on LT1619EMS8#TRPBF, and how should it be connected?
The DRV pin supplies the gate driver's pull-up rail. For non-bootstrapped operation (e.g., VIN ≥ 8V), tie DRV directly to VIN. For bootstrapped operation (e.g., 3.3V→5V boost), connect DRV to VOUT via low-ESR capacitor; this elevates gate drive voltage above VIN, ensuring full MOSFET enhancement even at low input. Incorrect DRV routing causes weak turn-on and excessive conduction loss.
Does LT1619EMS8#TRPBF require an external current sense resistor, and what tolerance is recommended?
Yes, LT1619EMS8#TRPBF requires an external low-inductance, low-TC current sense resistor (RSENSE) between MOSFET source and GND. For 2A max switch current, a 0.0265Ω ±0.5% resistor yields 53mV at limit. Dale WSL or IRC series resistors are recommended for <50ppm/°C TC and <1nH parasitic inductance to preserve blanking effectiveness and accuracy over temperature.
LT1619EMS8#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
- Output Type:
- Transistor Driver
- Function:
- Step-Up, Step-Up/Step-Down
- Output Configuration:
- Positive, Isolation Capable
- Topology:
- Boost, Cuk, Flyback, SEPIC
- Number of Outputs:
- 1
- Output Phases:
- 1
- Voltage - Supply (Vcc/Vdd):
- 1.9V ~ 18V
- Frequency - Switching:
- 300kHz
- Duty Cycle (Max):
- 92%
- Synchronous Rectifier:
- No
- Clock Sync:
- Yes
- Serial Interfaces:
- -
- Control Features:
- Enable
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-MSOP
LT1619EMS8#TRPBF FAQ
1.How can I place an order for LT1619EMS8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1619EMS8#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 LT1619EMS8#TRPBF reliable?
The price and inventory of LT1619EMS8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1619EMS8#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1619EMS8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1619EMS8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1619EMS8#TRPBF?
LT1619EMS8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1619EMS8#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 LT1619EMS8#TRPBF?
For technical support, including LT1619EMS8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1619EMS8#TRPBF requirements.
6.How does Aetrix verify that LT1619EMS8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1619EMS8#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 LT1619EMS8#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1619EMS8#TRPBF?
All LT1619EMS8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1619EMS8#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 LT1619EMS8#TRPBF part is unused and in its original packaging.
Return procedure for LT1619EMS8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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