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Analog Devices Inc. LT1619EMS8#PBF
- Part No.:
- LT1619EMS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LT1619EMS8#PBF.pdf
- Description:
- IC REG CTRLR MULT TOPOLOGY 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,523
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Product details
Overview
LT1619EMS8#PBF from Analog Devices (formerly Linear Technology) is a fixed-frequency current-mode PWM controller for low-side N-channel MOSFET–driven DC/DC converters, supporting boost, SEPIC, and flyback topologies. It operates from 1.9V to 18V input, features a 300kHz internal oscillator, 53mV current-sense threshold, 1A rail-to-rail gate driver, and Burst Mode operation for light-load efficiency in battery-powered and distributed power supplies.
For engineers reviewing the LT1619EMS8#PBF datasheet, LT1619EMS8#PBF pinout, LT1619EMS8#PBF application, or LT1619EMS8#PBF equivalent, key selection considerations include its 1.9V minimum start-up voltage, bootstrapped/nonbootstrapped DRV pin flexibility, leading-edge blanking for noise immunity, internal current sense amplifier, and synchronization capability up to 500kHz.
Technical Context
The LT1619EMS8#PBF implements peak-current-mode control with an internal 300kHz oscillator, slope compensation derived from the timing ramp, and a dedicated current-limit comparator independent of duty cycle. Its error amplifier (transconductance: 80–260 µ℧⁻¹) drives the VC pin to regulate peak switch current, while the SENSE pin accepts up to 53mV before limiting-enabling precise overcurrent protection across temperature.
Operation includes three distinct modes: continuous switching (CCM/DCM), idle mode (140µA quiescent), and Burst Mode (10mV effective limit, ~15µA avg. supply). The S/S pin serves dual function-shutdown (active-low, 0.45V threshold, 12–33µs delay) and external synchronization (pulse amplitude ≥1V, rise time ≤530ns at 3V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 1.9V to 18V - supports single-cell Li-ion, multi-cell alkaline, and intermediate bus rails without external LDO. |
| Switching Frequency | 300kHz fixed (±80kHz over temp) - balances EMI, size, and efficiency; externally synchronizable to 500kHz. |
| Current Sense Threshold | 53mV (typ), 40–66mV (min/max) - sets maximum switch current as ISW(MAX) = 53mV / RSENSE, enabling accurate overcurrent protection. |
| Gate Driver Output | ±1.5A peak, rail-to-rail - drives N-MOSFETs up to 60nC Qg; supports bootstrapped (DRV tied to VOUT) or nonbootstrapped (DRV = VIN) operation. |
| Quiescent Current | 140µA (typ) in idle mode - extends battery life in standby; drops to 15µA in shutdown. |
| Reference Voltage | 1.24V (typ), ±2% over temp - sets output voltage via FB divider: VOUT = 1.24V × (1 + R1/R2). |
| UVLO Threshold | 1.65–1.85V - prevents erratic startup below valid operating range; hysteresis enabled via external circuitry. |
Pinout & Package
The LT1619EMS8#PBF is housed in an 8-lead MSOP package (3mm × 3mm, 0.65mm pitch), thermally enhanced with exposed pad (not electrically connected). Pin 1 is marked with a dot; pin numbering follows standard MS8 counterclockwise orientation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| S/S (Pin 1) | Shutdown/Synchronization Input | Active-low shutdown (0.45V threshold); accepts external sync pulses ≥1V to force oscillator reset. |
| FB (Pin 2) | Error Amplifier Inverting Input | Connects to resistor divider tap; regulates output by comparing feedback to 1.24V reference. |
| VC (Pin 3) | Error Amplifier Output | Drives compensation network; voltage level directly controls peak switch current and load regulation. |
| GND (Pin 4) | Analog/Digital Ground | Primary return path for sense, feedback, and bias currents; must connect to local ground plane. |
| SENSE (Pin 5) | Current Sense Input | Connects to source of low-side N-MOSFET and RSENSE; internal 280ns leading-edge blanking rejects gate-charge transients. |
| GATE (Pin 6) | MOSFET Gate Driver Output | Drives external N-MOSFET gate; capable of ±1.5A peak, with 30ns rise/35ns fall into 3.3nF load. |
| DRV (Pin 7) | Driver Supply Rail | Provides pull-up for GATE; tied to VIN for nonbootstrapped operation or to VOUT for enhanced gate drive in low-VIN boost. |
| VIN (Pin 8) | Main Power Input | Supplies internal bias circuits; requires local 0.1µF ceramic bypass to GND; absolute max 20V. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode Operation | Reduces light-load quiescent current to ~15µA average by gating full switching cycles-critical for >100-hour battery life in IoT sensors. |
| Internal Leading-Edge Blanking | 280ns blanking window on SENSE pin eliminates false triggering from MOSFET gate-charge spikes-enables reliable current sensing with low-RSENSE. |
| Rail-to-Rail N-Channel Driver | Delivers ±1.5A peak into capacitive loads while maintaining <350mV high-side drop and <100mV low-side saturation-supports fast, efficient MOSFET switching. |
| External Synchronization | Accepts TTL/CMOS sync pulses up to 500kHz-enables EMI reduction via frequency dithering or system-level clock alignment. |
| Wide Input Range with UVLO | Operates down to 1.9V input and includes undervoltage lockout (1.65–1.85V) - ensures clean startup in brownout conditions without external supervision. |
Applications
| Portable Medical Sensors | Industrial Field Transmitters |
|---|---|
Use Scenario: Wearable glucose monitor powered by single 3.3V Li-ion cell requiring regulated 5V for sensor bias and BLE radio. IC Role / Device Role / Timing Role: LT1619EMS8#PBF acts as boost controller driving low-side N-MOSFET; regulates 5V output using FB divider and senses current via 10mΩ RSENSE. Use Value: 140µA idle current extends battery runtime beyond 120 hours; Burst Mode maintains >85% efficiency at 1mA load. | Use Scenario: 4–20mA loop-powered pressure transmitter operating from 12–24V DC supply with isolated 3.3V digital section. IC Role / Device Role / Timing Role: LT1619EMS8#PBF configures as flyback controller with optocoupler feedback; DRV pin bootstrapped to secondary for gate enhancement. Use Value: 300kHz fixed frequency enables compact transformer design; internal current sense amplifier eliminates need for external op-amp. |
| Distributed Telecom Power | Automotive Body Control Modules |
Use Scenario: Point-of-load converter on 12V automotive bus generating 3.3V for microcontroller in infotainment head unit. IC Role / Device Role / Timing Role: LT1619EMS8#PBF operates in SEPIC topology to tolerate cold-crank dips to 4.5V; S/S pin synchronized to system clock for EMI compliance. Use Value: 1.9V start-up ensures operation during cranking; 500kHz sync capability allows spread-spectrum modulation to pass CISPR-25 Class 5. | Use Scenario: LED interior lighting module powered from 9–16V battery with dimming via PWM input. IC Role / Device Role / Timing Role: LT1619EMS8#PBF configured as boost controller driving external N-MOSFET; FB pin used for output regulation, not dimming control. Use Value: 53mV current limit provides precise LED string current control; 8-lead MSOP footprint minimizes PCB area in space-constrained door modules. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PWM controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX17595ATP+T | Higher 4.5–60V input range; integrated high-side gate driver; no Burst Mode; 600kHz max frequency. | Designed for industrial/high-voltage boost/flyback; lacks low-VIN capability and ultra-low quiescent current. | Choose MAX17595ATP+T when input exceeds 18V or high-side drive is required; avoid for sub-2V start-up or battery longevity focus. |
| TPS40210DGQ | 2.25–5.5V input only; external current-sense amplifier; no internal reference; 1MHz max frequency. | Targeted at low-input, high-frequency point-of-load; requires external 1.24V reference and compensation components. | Choose TPS40210DGQ for compact 3.3V-input designs needing >500kHz; avoid when wide VIN or integrated reference is needed. |
Compared with MAX17595ATP+T and TPS40210DGQ, the LT1619EMS8#PBF uniquely combines 1.9V start-up, integrated 1.24V reference, Burst Mode, and dual-mode DRV supply-making it optimal for battery-powered systems requiring robust low-VIN operation and extended standby life.
Availability
LT1619EMS8#PBF is available at Aetrix Electronics and suitable for portable medical sensors, industrial field transmitters, distributed telecom power, and automotive body control modules requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LT1619EMS8#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 and maintains its precision analog and power management portfolio. Linear's legacy ICs-including the LT1619-are supported with full datasheets, SPICE models, and application notes.
The LT1619 belongs to Linear's current-mode PWM controller family designed for high-efficiency, low-component-count DC/DC conversion in space- and power-constrained applications-especially where wide input range and ultra-low quiescent current are critical.
FAQ
What is the minimum input voltage required for LT1619EMS8#PBF to start switching?
The LT1619EMS8#PBF guarantees startup at 1.85V input, with undervoltage lockout (UVLO) releasing between 1.65V and 1.85V. Below 1.65V, the device remains latched off; above 1.85V, it initiates normal operation. This makes LT1619EMS8#PBF suitable for single-cell Li-ion (2.7–4.2V) and multi-cell alkaline (3–9V) systems where low-VIN reliability is essential.
Can LT1619EMS8#PBF drive a high-side N-channel MOSFET?
No, the LT1619EMS8#PBF is specifically designed to drive low-side N-channel MOSFETs only. Its gate driver architecture lacks a high-side floating supply or level-shifting capability. Attempting high-side drive would result in insufficient gate-source voltage and unreliable switching. For high-side configurations, use a dedicated high-side driver or a controller like the LT3757.
How does the SENSE pin's leading-edge blanking work in LT1619EMS8#PBF?
The LT1619EMS8#PBF disables the current sense amplifier for 280ns immediately after GATE turns on, blocking gate-charge-induced voltage spikes across RSENSE. This blanking window is fixed and internal-no external components required. It ensures accurate current measurement begins only after turn-on transients settle, preventing premature current-limit triggering in noisy layouts.
What is the purpose of the DRV pin on LT1619EMS8#PBF, and how should it be connected?
The DRV pin supplies the upper rail for the GATE driver. For nonbootstrapped operation (e.g., VIN ≥ 5V), tie DRV directly to VIN. For bootstrapped operation (e.g., 3.3V-to-5V boost), connect DRV to VOUT to increase gate drive voltage and ensure full MOSFET enhancement. Incorrect DRV connection causes weak drive, excessive conduction loss, or thermal runaway.
Does LT1619EMS8#PBF support external frequency synchronization, and what are the requirements?
Yes, LT1619EMS8#PBF supports external synchronization via the S/S pin. Drive S/S with pulses ≥1V amplitude; maximum allowable rise time is 530ns at 3V (per Table 1 in datasheet). Synchronization range is 370–500kHz. The internal oscillator is forced to reset on each rising edge-enabling EMI reduction and system clock alignment without modifying the LT1619EMS8#PBF's internal timing components.
LT1619EMS8#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tube
- 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#PBF FAQ
1.How can I place an order for LT1619EMS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1619EMS8#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 LT1619EMS8#PBF reliable?
The price and inventory of LT1619EMS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1619EMS8#PBF is usually 5 days.
3.What payment methods are accepted for LT1619EMS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1619EMS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1619EMS8#PBF?
LT1619EMS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1619EMS8#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 LT1619EMS8#PBF?
For technical support, including LT1619EMS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1619EMS8#PBF requirements.
6.How does Aetrix verify that LT1619EMS8#PBF is sourced from the original manufacturer or authorized distributors?
All LT1619EMS8#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 LT1619EMS8#PBF meets industry standards.
7.What is the process for return or replacement of LT1619EMS8#PBF?
All LT1619EMS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1619EMS8#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 LT1619EMS8#PBF part is unused and in its original packaging.
Return procedure for LT1619EMS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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