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Analog Devices Inc. LT1619ES8#PBF
- Part No.:
- LT1619ES8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1619ES8#PBF.pdf
- Description:
- IC REG CTRLR MULT TOPOLOGY 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,474
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Product details
Overview
LT1619ES8#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, 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 LT1619ES8#PBF datasheet, LT1619ES8#PBF pinout, LT1619ES8#PBF application, or LT1619ES8#PBF 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 compatibility with MSOP-8 and SO-8 packages.
Technical Context
The LT1619ES8#PBF implements current-mode control using an internal slope-compensated ramp derived from a 300kHz oscillator, with leading-edge blanking (280ns) to reject gate-drive transients. Its error amplifier (transconductance: 80–260 µ℧⁻¹) drives the VC pin to regulate peak switch current via the current sense comparator.
It features dual-mode operation: continuous switching above ~10mA load and Burst Mode below that threshold-triggered by VC falling below VB-reducing light-load quiescent current to 140µA while maintaining regulation. The S/S pin serves as both shutdown input (threshold: 0.45V) and synchronization port (pulse amplitude ≥1V, max rise time 530ns at 3V).
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, size, and efficiency; externally synchronizable up to 500kHz. |
| Current Sense Threshold | 53mV (typ), 40–66mV (min/max) - sets precise overcurrent limit; enables accurate RSENSE-based current limiting with minimal voltage drop. |
| Quiescent Current | 140µA (typ) - minimizes standby power loss in always-on battery systems. |
| Shutdown Current | 15µA (typ) - ensures ultra-low leakage during system sleep states. |
| Driver Output Current | ±1.5A peak - directly drives N-MOSFETs with ≤60nC gate charge; supports bootstrapped DRV for low-VIN enhancement. |
| Reference Voltage | 1.24V (typ), ±2% over temp - defines output voltage accuracy in feedback loop (VOUT = 1.24 × (1 + R1/R2)). |
Pinout & Package
LT1619ES8#PBF is housed in an 8-lead plastic SO package (SO-8), with gull-wing leads, JEDEC MS-012AC compliant, 1.27mm pitch, and 5.0mm × 6.2mm body size.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| S/S (Pin 1) | Shutdown / Sync Input | Active-low shutdown (threshold 0.45V); accepts external sync pulses ≥1V to align switching frequency. |
| FB (Pin 2) | Error Amplifier Inverting Input | Connects to resistor divider tap; senses output voltage for regulation; bias current ≤25nA. |
| VC (Pin 3) | Error Amplifier Output | Compensation node; controls peak switch current; requires RC network to GND for loop stability. |
| GND (Pin 4) | Analog & Power Ground | Common reference for all internal circuits; must connect to local ground plane with low-inductance path. |
| SENSE (Pin 5) | Current Sense Input | Connects to source of low-side N-MOSFET and RSENSE; includes 280ns leading-edge blanking. |
| GATE (Pin 6) | MOSFET Driver Output | Drives gate of external N-channel MOSFET; rail-to-rail swing with 1.5A drive capability. |
| DRV (Pin 7) | Driver Supply Rail | Provides pull-up for GATE; tied to VIN for non-bootstrapped operation or to VOUT for enhanced gate drive in low-VIN boost. |
| VIN (Pin 8) | Main Power Input | Supplies internal circuitry; bypassed locally to GND; UVLO triggers at 1.65–1.85V. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode® Operation | Reduces light-load quiescent current to 140µA by disabling switching cycles until output droop triggers restart-critical for >100-hour battery life in IoT sensors. |
| Rail-to-Rail N-Channel Driver | Delivers ±1.5A peak current to drive low-side MOSFETs directly-eliminates need for external driver in 3.3V→5V boost designs with ≤60nC Qg devices. |
| Internal Leading-Edge Blanking | 280ns blanking window on SENSE pin prevents false current-limit triggering from MOSFET gate-charge spikes-improves reliability in high-dV/dt layouts. |
| External Synchronization Support | Accepts sync pulses up to 500kHz with defined rise-time limits (e.g., ≤530ns at 3V)-enables EMI reduction via frequency dithering or multi-phase coordination. |
| Separate DRV Pin | Allows bootstrapped gate drive (DRV → VOUT) for full enhancement of low-RDS(ON) MOSFETs even at VIN = 1.9V-essential for high-efficiency 3.3V→5V conversion. |
Applications
| Portable Medical Sensors | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Battery-powered glucose monitor requiring regulated 5V rail from single 3.3V Li-ion cell with <100µA standby draw. IC Role / Device Role / Timing Role: Primary PWM controller implementing boost topology with low-side N-MOSFET; regulates output via FB/VC loop while entering Burst Mode between sensor readings. Use Value: 140µA quiescent current extends battery life beyond 12 months; 53mV current sense threshold enables precise overcurrent protection without burden voltage penalty. | Use Scenario: DIN-rail mounted analog input module powered from 24V DC bus, needing isolated 5V/3.3V rails for ADC and microcontroller. IC Role / Device Role / Timing Role: Controller for flyback converter driving opto-isolated gate driver; uses S/S pin for system-wide sync to avoid beat frequencies in multi-channel acquisition. Use Value: 300kHz fixed frequency simplifies EMI filter design; 500kHz sync capability allows alignment with master clock to suppress conducted emissions in dense PCB layouts. |
| Distributed Telecom Power | Automotive Body Control Units |
Use Scenario: Point-of-load 3.3V supply in 48V telecom shelf, stepping down from intermediate 12V rail with strict thermal constraints. IC Role / Device Role / Timing Role: SEPIC controller supporting wide input variation (9–15V); DRV pin tied to diode-OR'ed input/output for robust start-up under brownout conditions. Use Value: 1.9V minimum VIN enables operation during cold cranking dips; 1A driver sustains gate drive into 1000pF+ gate loads common in high-current MOSFETs. | Use Scenario: Interior lighting control module powered from vehicle battery (9–16V), requiring 5V rail for MCU and CAN transceiver with low EMI. IC Role / Device Role / Timing Role: Boost controller for LED driver supply; uses external sync to lock switching to CAN bit timing, minimizing noise coupling into communication lines. Use Value: Synchronization eliminates beat interference with CAN FD frames; 15µA shutdown current meets ISO 16750-2 quiescent drain requirements for parked vehicle mode. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PWM controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM3478MM/NOPB | Fixed 1MHz frequency; no Burst Mode; higher 2.5mA quiescent current; requires external slope compensation. | Better suited for compact, high-frequency designs where size dominates efficiency; lacks light-load optimization. | Select when board space is constrained and light-load efficiency is secondary to footprint and cost. |
| TPS40210DRCT | Adjustable frequency (100kHz–1MHz); no integrated current sense amp; requires external current-sense resistor and comparator; 1.2mA quiescent current. | Offers greater flexibility in frequency tuning and topology adaptation but increases BOM count and layout complexity. | Prefer when custom frequency or multi-topology support (e.g., buck-boost) is required and design resources allow added component count. |
Compared with LM3478MM/NOPB and TPS40210DRCT, LT1619ES8#PBF delivers superior light-load efficiency via Burst Mode and lower quiescent current, while integrating current sensing and slope compensation-reducing external components and layout sensitivity in space-constrained battery systems.
Availability
LT1619ES8#PBF is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, distributed telecom power, and automotive body control units requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT1619ES8#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, Inc. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision instrumentation, industrial automation, communications, and healthcare markets.
The LT1619ES8#PBF belongs to ADI's legacy Linear Technology power management portfolio, designed specifically for high-efficiency, low-voltage DC/DC conversion in battery-critical and thermally constrained applications.
FAQ
What is the minimum input voltage required for LT1619ES8#PBF to start switching?
The LT1619ES8#PBF guarantees startup at 1.85V input voltage, enforced by an internal undervoltage lockout (UVLO) comparator with a 1.65V to 1.85V threshold range. Below this, the device halts switching and draws only 140µA quiescent current. This makes LT1619ES8#PBF suitable for single-cell Li-ion (2.7V–4.2V) and multi-cell alkaline (3V–6V) systems where low-VIN operation is essential.
Can LT1619ES8#PBF drive a high-gate-charge MOSFET like the SiR872DP?
LT1619ES8#PBF specifies ±1.5A peak driver output and supports MOSFETs with up to 60nC total gate charge. The SiR872DP has 105nC Qg, exceeding this limit. For such devices, an external gate driver is required-LT1619ES8#PBF can still provide PWM control signals, but the GATE pin must interface with a buffer stage. Always verify gate drive strength against Qg and desired switching speed in your LT1619ES8#PBF design.
How does Burst Mode operation affect output voltage ripple in LT1619ES8#PBF?
Burst Mode operation in LT1619ES8#PBF increases output voltage ripple compared to continuous conduction mode because energy is delivered in discrete bursts rather than continuously. Ripple magnitude depends on output capacitance, ESR, and burst frequency-which itself varies with input voltage, output voltage, inductance, and load. Typical ripple in Burst Mode may reach 2–3% of VOUT, versus <0.5% in CCM. Designers should select low-ESR ceramic or polymer capacitors and verify transient response in LT1619ES8#PBF applications.
Is LT1619ES8#PBF compatible with bootstrapped gate drive in a 3.3V-to-5V boost converter?
Yes-LT1619ES8#PBF explicitly supports bootstrapped operation via the DRV pin. In a 3.3V-to-5V boost, tie DRV to VOUT (5V) instead of VIN (3.3V) to ensure full gate enhancement of the low-side N-MOSFET, especially critical at low input voltages where VGS margin is limited. This configuration is validated in Linear Technology's Figure 1 and enables >90% efficiency at full load in LT1619ES8#PBF reference designs.
What is the purpose of the SENSE pin's leading-edge blanking in LT1619ES8#PBF?
The SENSE pin in LT1619ES8#PBF includes a fixed 280ns leading-edge blanking window that disables the current sense amplifier immediately after GATE turn-on. This prevents false overcurrent triggering caused by MOSFET gate-charge current flowing through RSENSE-a common issue in high-dV/dt switching. By ignoring this transient, LT1619ES8#PBF ensures accurate current limiting and stable operation, particularly with fast-switching MOSFETs and compact layouts.
LT1619ES8#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm 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-SO
LT1619ES8#PBF FAQ
1.How can I place an order for LT1619ES8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1619ES8#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 LT1619ES8#PBF reliable?
The price and inventory of LT1619ES8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1619ES8#PBF is usually 5 days.
3.What payment methods are accepted for LT1619ES8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1619ES8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1619ES8#PBF?
LT1619ES8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1619ES8#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 LT1619ES8#PBF?
For technical support, including LT1619ES8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1619ES8#PBF requirements.
6.How does Aetrix verify that LT1619ES8#PBF is sourced from the original manufacturer or authorized distributors?
All LT1619ES8#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 LT1619ES8#PBF meets industry standards.
7.What is the process for return or replacement of LT1619ES8#PBF?
All LT1619ES8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1619ES8#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 LT1619ES8#PBF part is unused and in its original packaging.
Return procedure for LT1619ES8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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