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Analog Devices Inc. LTC3619BEMSE#PBF
- Part No.:
- LTC3619BEMSE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3619BEMSE#PBF.pdf
- Description:
- IC REG BUCK ADJ DL 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:150
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Product details
Overview
LTC3619BEMSE#PBF from Analog Devices (formerly Linear Technology) is a dual monolithic synchronous step-down DC/DC regulator with programmable average input current limiting, operating from 2.5V to 5.5V input and delivering up to 400mA (Channel 1) and 800mA (Channel 2) at output voltages as low as 0.6V. It features 2.25MHz constant-frequency current-mode control, independent soft-start, and power-good monitoring per channel - ideal for USB-powered handheld devices requiring stable dual-rail power with input current compliance.
For engineers reviewing the LTC3619BEMSE#PBF datasheet, LTC3619BEMSE#PBF pinout, LTC3619BEMSE#PBF application, or LTC3619BEMSE#PBF equivalent, key selection criteria include its ±5% accurate input current limit, 100% duty-cycle dropout capability, ±2% output voltage accuracy, and thermally enhanced 10-lead MSOP package with exposed GND pad for high-power-density Li-ion and supercapacitor-based systems.
Technical Context
The LTC3619BEMSE#PBF implements a dual-channel, in-phase, constant-frequency current-mode architecture with shared 2.25MHz oscillator. Each channel uses independent error amplifiers, peak-current sensing via internal PFET/NFET switches, and dedicated soft-start ramping (0.3–1.3ms) to regulate outputs down to 0.6V with ±2% accuracy over –40°C to 125°C.
Its programmable average input current limit operates by summing scaled inductor current representations from both channels at the RLIM pin; when total exceeds the threshold (e.g., 475mA with 116kΩ), Channel 2 enters current limiting while Channel 1 remains fully regulated - enabling high peak load delivery without collapsing USB or battery supplies.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5V to 5.5V - supports single-cell Li-ion and USB 2.0/3.0 bus operation without external LDO pre-regulation. |
| Output Current Capability | Channel 1: 400mA; Channel 2: 800mA - enables independent powering of core logic and RF subsystems. |
| Switching Frequency | 2.25MHz (typ) - allows use of compact 2.2µH–4.7µH surface-mount inductors and reduces EMI filtering burden. |
| Feedback Reference Voltage | 0.6V ±2% - enables precise low-voltage regulation (e.g., 1.2V, 1.8V, 3.3V) using standard resistor dividers. |
| Average Input Current Limit Accuracy | ±5% - ensures reliable USB 2.0 500mA compliance and prevents host port shutdown during transient loads. |
| Shutdown Quiescent Current | ≤1µA - minimizes battery drain in always-on standby modes for portable medical or IoT sensors. |
| Thermal Resistance θJA | 45°C/W (MSOP package) - requires minimal PCB copper area for thermal management in space-constrained layouts. |
Pinout & Package
Package: 10-Lead Plastic MSOP with exposed thermal pad (Pin 11 = GND). Requires soldering of exposed pad to PCB ground plane for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VFB1 (Pin 1) | Channel 1 feedback input | Connects to resistive divider on VOUT1; regulates output to 0.6V reference - sets output voltage precisely. |
| RUN1 (Pin 2) | Channel 1 enable control | High = enable; low = shutdown with ≤1µA IQ; supports sequencing and power-domain isolation. |
| RLIM (Pin 3) | Average input current limit programming | Resistor-to-GND sets limit (e.g., 116kΩ = 475mA); capacitor filters transients - critical for USB-compliant designs. |
| PGOOD1 (Pin 4) | Channel 1 power-good indicator | Open-drain output asserts low when VFB1 deviates >±5% from 0.6V - used for system reset or enable coordination. |
| SW1 (Pin 5) | Channel 1 switch node | Connects to inductor; swings between VIN and GND - must be routed with short, low-inductance traces to minimize EMI. |
| VIN (Pin 6) | Main power input | Supplies both channels; requires local 10µF ceramic decoupling close to pin - essential for stability under pulsed loads. |
| SW2 (Pin 7) | Channel 2 switch node | Independent high-side switching node for second output - enables asynchronous inductor placement and layout separation. |
| PGOOD2 (Pin 8) | Channel 2 power-good indicator | Independent open-drain status signal - allows fault isolation and dual-rail sequencing verification. |
| RUN2 (Pin 9) | Channel 2 enable control | Independent enable/disable control - supports staggered startup and dynamic power scaling. |
| VFB2 (Pin 10) | Channel 2 feedback input | Separate regulation loop for second output - enables different VOUT values (e.g., 1.8V + 3.3V) with no cross-coupling. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable average input current limit | Enables USB 2.0-compliant 500mA operation while sustaining >2A peak output load through intelligent channel prioritization. |
| Dual independent soft-start | Prevents inrush current on each output separately - avoids input rail collapse during simultaneous startup of multiple rails. |
| 100% duty-cycle low-dropout mode | Maintains regulation down to VIN – VOUT ≈ 100mV at light loads - extends battery runtime in deep-discharge conditions. |
| Pulse-skipping light-load operation | Reduces switching losses and output ripple at <10mA loads - improves efficiency to >85% at 100µA while suppressing audible noise. |
| Short-circuit protected outputs | Forces extended NFET conduction to safely discharge inductor during output shorts - prevents thermal runaway without external components. |
Applications
| USB-Powered Handheld Devices | GSM Pulse Load Management |
|---|---|
Use Scenario: Portable diagnostic tool powered via USB-C with dual-core processor (1.2V) and cellular modem (3.3V). IC Role / Device Role / Timing Role: Dual-output buck regulator providing isolated, sequenced, and current-limited power rails from a single 5V USB source. Use Value: Ensures USB port stays within 500mA limit during GSM transmit bursts while maintaining stable 1.2V/3.3V outputs - eliminating need for external current-limiting ICs. | Use Scenario: LTE module in asset tracker drawing 2A peaks for 577µs every 4.7ms during RF transmission. IC Role / Device Role / Timing Role: Input-current-limited dual buck supplying core logic and PA bias rails with coordinated PGOOD signaling. Use Value: CLIM capacitor (2.2nF) enables 92µs response to input overload - keeps VIN droop within 3% and sustains full 2A output without brownout. |
| Supercapacitor Charging Systems | Low-Power Industrial Sensors |
Use Scenario: Energy-harvesting node charging a 1F supercapacitor from USB, then powering 3.3V MCU and 1.8V sensor. IC Role / Device Role / Timing Role: Dual buck regulating supercap-derived 3.3V/1.8V rails with precise input current capping during charge phase. Use Value: Programmable RLIM resistor prevents supercap overcurrent during initial charge - extends capacitor lifetime and avoids thermal stress. | Use Scenario: Wireless temperature sensor operating from coin cell, requiring ultra-low quiescent current and long sleep duration. IC Role / Device Role / Timing Role: Dual-output regulator delivering 1.8V (MCU) and 3.3V (radio) with <1µA shutdown current and pulse-skipping efficiency. Use Value: Achieves >90% efficiency at 100µA load and <0.5µA total system sleep current - enabling 5-year battery life. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62125DSGR | Single-output, 3–17V input, 1.2A max, fixed 3.3V or adjustable via resistor; no input current limit; 2.25MHz switching. | Lacks dual outputs and programmable input current limiting - unsuitable for USB-compliant dual-rail systems. | Select only if single-rail, higher-input-voltage, or cost-sensitive applications eliminate need for input current control and rail independence. |
| LTC3619EMSE#PBF | Burst Mode® variant with lower quiescent current (25µA active), same pinout and specs except input current limit disabled and reduced light-load efficiency. | Optimized for ultra-low-power always-on systems rather than high-peak-current USB applications. | Choose LTC3619EMSE#PBF only when minimizing no-load IQ is primary; LTC3619BEMSE#PBF is mandatory for USB current compliance. |
Compared with TPS62125DSGR and LTC3619EMSE#PBF, the LTC3619BEMSE#PBF uniquely delivers dual independent outputs with ±5% programmable input current limiting - making it the only option for space-constrained, USB-powered devices requiring both rail flexibility and strict input compliance.
Availability
LTC3619BEMSE#PBF is available at Aetrix Electronics and suitable for USB-powered handheld devices, GSM pulse-load transmitters, supercapacitor energy storage systems, and low-power industrial sensor nodes requiring stable component supply and long-term production continuity.
Supply support for LTC3619BEMSE#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 technologies, serving industrial, automotive, communications, and healthcare markets.
The LTC3619BEMSE#PBF belongs to ADI's Power by Linear™ family of high-efficiency DC/DC regulators, designed specifically for compact, high-current-density power delivery in battery- and USB-powered portable electronics with stringent input compliance requirements.
FAQ
What is the maximum output current supported by each channel of the LTC3619BEMSE#PBF?
The LTC3619BEMSE#PBF supports up to 400mA on Channel 1 and 800mA on Channel 2 under typical conditions (VIN = 5V, TA = 25°C, with appropriate thermal design). These ratings assume proper PCB layout with the exposed GND pad soldered and adequate copper area for heat dissipation. Derating applies at elevated ambient temperatures or higher VIN–VOUT differentials.
How does the programmable average input current limit function in the LTC3619BEMSE#PBF?
The LTC3619BEMSE#PBF uses an external resistor (RLIM) from Pin 3 to GND to set the average input current limit - e.g., 116kΩ yields 475mA. The device sums scaled inductor currents from both channels at RLIM; when exceeded, Channel 2 enters current limiting while Channel 1 remains regulated. This preserves system functionality during USB current excursions without collapsing the input rail.
Can the LTC3619BEMSE#PBF operate with a 100% duty cycle, and what is its significance?
Yes, the LTC3619BEMSE#PBF supports 100% duty cycle operation, enabling low-dropout regulation when VIN approaches VOUT. In this mode, the internal PMOS switch remains continuously on, minimizing voltage drop across the switch and extending usable battery life in deeply discharged states - critical for Li-ion systems operating down to 2.5V input.
What package type and thermal characteristics apply to the LTC3619BEMSE#PBF?
The LTC3619BEMSE#PBF uses a 10-lead plastic MSOP package with exposed thermal pad (Pin 11 = GND), rated for θJA = 45°C/W. Successful thermal performance requires soldering the exposed pad to a minimum 100mm² PCB copper area connected to internal ground planes. This configuration supports continuous 400mA/800mA output at 85°C ambient with VIN = 5V and VOUT = 3.3V/1.8V.
Does the LTC3619BEMSE#PBF support independent power sequencing between its two outputs?
Yes, the LTC3619BEMSE#PBF provides independent RUN1 (Pin 2) and RUN2 (Pin 9) enable inputs, allowing precise control over startup timing and shutdown order. Combined with separate PGOOD1 (Pin 4) and PGOOD2 (Pin 8) signals, it enables robust power sequencing for FPGAs, processors, or multi-rail SoCs - ensuring correct voltage ramp order and fault isolation without external logic.
LTC3619BEMSE#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 2
- Voltage - Input (Min):
- 2.5V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 0.6V
- Voltage - Output (Max):
- 5V
- Current - Output:
- 400mA, 800mA
- Frequency - Switching:
- 2.25MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-MSOP-EP
LTC3619BEMSE#PBF FAQ
1.How can I place an order for LTC3619BEMSE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3619BEMSE#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 LTC3619BEMSE#PBF reliable?
The price and inventory of LTC3619BEMSE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3619BEMSE#PBF is usually 5 days.
3.What payment methods are accepted for LTC3619BEMSE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3619BEMSE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3619BEMSE#PBF?
LTC3619BEMSE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3619BEMSE#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 LTC3619BEMSE#PBF?
For technical support, including LTC3619BEMSE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3619BEMSE#PBF requirements.
6.How does Aetrix verify that LTC3619BEMSE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3619BEMSE#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 LTC3619BEMSE#PBF meets industry standards.
7.What is the process for return or replacement of LTC3619BEMSE#PBF?
All LTC3619BEMSE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3619BEMSE#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 LTC3619BEMSE#PBF part is unused and in its original packaging.
Return procedure for LTC3619BEMSE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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