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Analog Devices Inc. LT1619ES8#TRPBF
- Part No.:
- LT1619ES8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1619ES8#TRPBF.pdf
- Description:
- IC REG CTRLR MULT TOPOLOGY 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:10,601
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Product details
Overview
LT1619ES8#TRPBF from Analog Devices (formerly Linear Technology) is a fixed-frequency current mode PWM controller for low-side N-channel MOSFET–driven boost, SEPIC, and flyback DC/DC converters. 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 LT1619ES8#TRPBF datasheet, LT1619ES8#TRPBF pinout, LT1619ES8#TRPBF application, or LT1619ES8#TRPBF equivalent, key selection criteria include its 1.9V minimum start-up voltage, bootstrappable DRV pin for 3.3V→5V conversion, integrated leading-edge blanking, and compatibility with external synchronization up to 500kHz.
Technical Context
The LT1619ES8#TRPBF implements current-mode control using an internal slope-compensated ramp derived from its 300kHz oscillator and a dedicated current sense amplifier with 280ns leading-edge blanking. Its error amplifier (transconductance: 80–260 µ℧⁻¹) drives the VC pin to regulate peak switch current, enabling stable CCM/DCM transition and precise output voltage setting via FB pin (1.24V reference).
Shutdown and synchronization share the S/S pin, with active-low shutdown threshold at 0.45V and external sync capability up to 500kHz. The DRV pin supports flexible gate drive supply routing-tied to VIN for nonbootstrapped operation or to VOUT for enhanced gate drive in low-input applications like 3.3V boost.
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 intermediate bus rails without pre-regulation. |
| Switching Frequency | 300kHz fixed (±80kHz over temp) - balances size of magnetics/capacitors against EMI and efficiency trade-offs. |
| Current Sense Threshold | 53mV (typ) - sets maximum switch current as ISW(MAX) = 53mV / RSENSE, minimizing power loss in sense resistor. |
| Gate Driver Output | ±1.5A peak - drives N-MOSFETs with ≤60nC total gate charge directly; supports bootstrapped or nonbootstrapped configurations. |
| Quiescent Current | 140µA (typ) - sustains high light-load efficiency in always-on battery systems without auxiliary LDOs. |
| Burst Mode Threshold | 10mV - triggers discontinuous, low-frequency pulsing below light load, reducing average input current and improving η at <10mA output. |
| Reference Voltage | 1.24V (±2%) - defines output regulation accuracy via FB resistive divider; 0.05%/V line regulation minimizes output drift with input variation. |
Pinout & Package
LT1619ES8#TRPBF is housed in an 8-lead plastic SO package (SO-8), 3.9mm × 4.9mm, with standard JEDEC MS-012AC footprint and 1.27mm pitch. Thermal resistance θJA = 120°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| S/S (Pin 1) | Shutdown/Synchronization Input | Active-low shutdown (threshold 0.45V); accepts external sync pulses up to 500kHz; requires <120ns rise time for 1.2V amplitude. |
| FB (Pin 2) | Error Amplifier Inverting Input | Connects to resistive divider tap; regulates output via 1.24V internal reference; bias current ≤25nA enables high-R divider use. |
| VC (Pin 3) | Error Amplifier Output | Drives compensation network (RC to GND); voltage level reflects required peak inductor current; clamped between 1.6V–2.2V. |
| GND (Pin 4) | Analog/Digital Ground | Primary return path for sense amplifier, error amp, and oscillator; must connect to local ground plane with low-inductance trace. |
| SENSE (Pin 5) | Current Sense Input | Connects to source of low-side N-MOSFET and RSENSE; internal blanking disables sensing for 280ns after turn-on. |
| GATE (Pin 6) | MOSFET Gate Driver Output | Drives external N-MOSFET gate; rail-to-rail swing: high-level = VDRV − 0.35V (at −20mA), low-level = 100mV (at 20mA). |
| DRV (Pin 7) | Gate Driver Supply | 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 circuitry and DRV (if not bootstrapped); requires local 0.1µF ceramic bypass to GND; UVLO activates below 1.65V. |
Key Features
| Feature | Design Value |
|---|---|
| Internal Leading-Edge Blanking | 280ns blanking window prevents false current-limit triggering from MOSFET gate-charge transients during turn-on. |
| Rail-to-Rail N-Channel Driver | Delivers ±1.5A peak current with <35ns rise/fall times into 3300pF, enabling fast switching of low-Qg MOSFETs without external buffers. |
| Burst Mode Operation | Reduces quiescent current to 140µA and eliminates switching losses at light loads, extending battery runtime in standby modes. |
| External Synchronization Support | Accepts sync pulses up to 500kHz on S/S pin, allowing EMI reduction via frequency dithering or system-level clock alignment. |
| Integrated Slope Compensation | Nonlinear ramp derived from oscillator ensures stable current-mode control across full duty cycle range (up to 92%) without external components. |
Applications
| 3.3V to 5V Boost Converter | Distributed Power Supply |
|---|---|
Use Scenario: Generating regulated 5V from a single 3.3V logic rail in portable instrumentation or FPGA I/O banks. IC Role / Device Role / Timing Role: Primary PWM controller implementing current-mode boost topology with bootstrapped DRV pin for gate enhancement. Use Value: Enables >90% efficiency at 2.2A output with no external slope compensation or gate driver, reducing BOM count and PCB area. | Use Scenario: Local DC/DC conversion in telecom line cards or industrial PLC modules powered from a shared 12V or 24V backplane. IC Role / Device Role / Timing Role: Fixed-frequency current-mode controller for isolated flyback or SEPIC regulators delivering multiple isolated outputs. Use Value: Wide 1.9V–18V input range accommodates brownout conditions; 140µA quiescent current minimizes standby power draw across dozens of point-of-load converters. |
| Isolated Flyback Supply | Battery-Powered Portable Device |
Use Scenario: 12V-to-−65V isolated flyback converter powering analog front-end circuits requiring galvanic isolation and negative bias. IC Role / Device Role / Timing Role: Primary-side controller managing MOSFET switching, current limiting, and UVLO with S/S pin used for programmable startup sequencing. Use Value: Shutdown threshold (0.45V) and UVLO hysteresis allow precise control of turn-on voltage via external zener, preventing input collapse during high-inrush startup. | Use Scenario: Power management in handheld medical sensors or wireless IoT nodes operating from coin-cell or LiPo batteries. IC Role / Device Role / Timing Role: Low-voltage DC/DC controller enabling efficient step-up from depleted 2.0V battery to 3.3V system rail. Use Value: 1.9V minimum operating voltage and Burst Mode extend usable battery life by >3× compared to continuous-mode controllers under intermittent load. |
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 |
|---|---|---|---|
| LT3757EMS#TRPBF | Higher VIN range (2.8V–100V), integrated high-side gate driver, no bootstrapped DRV option. | Designed for high-input isolated flyback/forward; unsuitable for sub-2.5V start-up or low-side-only topologies. | Select LT3757EMS#TRPBF only when input exceeds 18V or high-side drive is required; LT1619ES8#TRPBF remains optimal for 1.9V–18V low-side N-MOSFET designs. |
| TPS40210DRCT | Fixed 600kHz frequency, no Burst Mode, higher 300µA quiescent current, requires external slope compensation. | Targeted at higher-frequency, higher-power industrial supplies where light-load efficiency is secondary to transient response. | Choose TPS40210DRCT for cost-sensitive 600kHz designs with external compensation flexibility; LT1619ES8#TRPBF offers superior light-load efficiency and simpler layout for <5W applications. |
Compared with LT3757EMS#TRPBF and TPS40210DRCT, the LT1619ES8#TRPBF uniquely combines ultra-low 1.9V start-up, integrated bootstrappable DRV, and Burst Mode-making it the only choice for compact, battery-critical 3.3V→5V or 2.5V→12V boost converters requiring <200µA idle current and minimal external components.
Availability
LT1619ES8#TRPBF is available at Aetrix Electronics and suitable for 3.3V-to-5V DC/DC converters, distributed power supplies, and isolated flyback converters requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for LT1619ES8#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, documentation, and technical support for all Linear parts including the LT1619 series.
The LT1619 belongs to Linear's legacy high-efficiency DC/DC controller family, designed specifically for low-voltage, low-power current-mode switching regulators in space-constrained and battery-dependent applications.
FAQ
What is the minimum input voltage required for LT1619ES8#TRPBF to start switching?
The LT1619ES8#TRPBF guarantees start-up at 1.85V input (undervoltage lockout threshold), with full operational specification from 1.9V to 18V. Below 1.85V, the internal UVLO circuit holds the device in shutdown, drawing only 15µA. This makes LT1619ES8#TRPBF suitable for deeply discharged Li-ion or multi-alkaline battery systems where other controllers would cease regulation.
Can LT1619ES8#TRPBF drive a high-side N-channel MOSFET?
No - the LT1619ES8#TRPBF is explicitly designed for low-side N-channel MOSFET topologies (boost, SEPIC, flyback). Its GATE pin is a low-side driver with ground-referenced output; it lacks high-side floating supply or level-shifting capability. Attempting high-side drive would result in incomplete turn-on and excessive conduction loss. For high-side applications, consider LT3757 or LT3758 instead of LT1619ES8#TRPBF.
How does the DRV pin function in bootstrapped vs. nonbootstrapped operation?
In nonbootstrapped mode, DRV is tied to VIN - the gate driver pulls GATE up to VIN, limiting maximum VGS to input voltage. In bootstrapped mode, DRV connects to VOUT - enabling VGS > VIN (e.g., 5V gate drive from 3.3V input), critical for fully enhancing low-RDS(ON) MOSFETs. The LT1619ES8#TRPBF's internal driver supports both configurations without external components.
What is the purpose of the 280ns leading-edge blanking on the SENSE pin of LT1619ES8#TRPBF?
The 280ns leading-edge blanking disables the current sense amplifier immediately after GATE turn-on to ignore the initial voltage spike across RSENSE caused by MOSFET gate-drain capacitance (Miller effect) and parasitic layout inductance. This prevents false current-limit triggering and ensures accurate peak-current detection during steady-state conduction - a critical feature for stable LT1619ES8#TRPBF operation in high-dV/dt environments.
Does LT1619ES8#TRPBF require external slope compensation?
No - the LT1619ES8#TRPBF integrates a progressive nonlinear slope compensation ramp derived directly from its internal oscillator. This eliminates the need for external RC networks or op-amps typically required in discrete current-mode controllers. The built-in compensation ensures stable operation across the full 0–92% duty cycle range without tuning, simplifying design and improving reliability of the LT1619ES8#TRPBF-based converter.
LT1619ES8#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm 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-SO
LT1619ES8#TRPBF FAQ
1.How can I place an order for LT1619ES8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1619ES8#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 LT1619ES8#TRPBF reliable?
The price and inventory of LT1619ES8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1619ES8#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1619ES8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1619ES8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1619ES8#TRPBF?
LT1619ES8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1619ES8#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 LT1619ES8#TRPBF?
For technical support, including LT1619ES8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1619ES8#TRPBF requirements.
6.How does Aetrix verify that LT1619ES8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1619ES8#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 LT1619ES8#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1619ES8#TRPBF?
All LT1619ES8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1619ES8#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 LT1619ES8#TRPBF part is unused and in its original packaging.
Return procedure for LT1619ES8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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