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Analog Devices Inc. LTC3619BEMSE#TRPBF
- Part No.:
- LTC3619BEMSE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3619BEMSE#TRPBF.pdf
- Description:
- IC REG BUCK ADJ DL 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,996
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Product details
Overview
LTC3619BEMSE#TRPBF from Analog Devices (formerly Linear Technology) is a dual monolithic synchronous buck regulator with constant-frequency current-mode control, delivering 400mA on Channel 1 and 800mA on Channel 2 across 2.5V–5.5V input. It features programmable average input current limiting (±5% accuracy), 2.25MHz switching, 0.6V feedback reference, and independent soft-start-optimized for USB-powered handheld devices and supercapacitor charging.
For engineers reviewing the LTC3619BEMSE#TRPBF datasheet, LTC3619BEMSE#TRPBF pinout, LTC3619BEMSE#TRPBF application, or LTC3619BEMSE#TRPBF equivalent, key selection criteria include input current limit programming via RLIM, PGOOD monitoring per channel, 100% duty cycle dropout operation, and thermal performance in the 10-lead MSOP package with exposed GND pad.
Technical Context
The LTC3619BEMSE#TRPBF implements two independent current-mode buck regulators sharing a synchronized 2.25MHz clock. Each channel uses internal P-channel and N-channel MOSFETs with RDS(ON) of 0.45Ω/0.35Ω (Ch1) and 0.27Ω/0.25Ω (Ch2) at 5V, enabling high efficiency up to 96%. The device continuously monitors summed input current and enforces the programmed limit by reducing Channel 2's peak switch current while maintaining Channel 1 regulation.
Light-load operation transitions to low-noise pulse-skipping mode; short-circuit protection forces extended bottom-switch conduction to prevent inductor current runaway. Soft-start ramps VOUT over ~950µs per channel, and PGOOD outputs provide open-drain voltage monitoring with ±7% threshold hysteresis and 90µs blanking.
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 power without external LDO pre-regulation. |
| Output Current Capability | Channel 1: 400mA; Channel 2: 800mA - enables dual-rail power delivery for core + I/O or RF + baseband subsystems. |
| Switching Frequency | 2.25MHz (typ) - permits use of compact 1.5–4.7µH surface-mount inductors and reduces output capacitor size. |
| Feedback Reference Voltage | 0.6V ±2% - allows precise low-voltage outputs (e.g., 1.2V, 1.8V) using standard resistor dividers with minimal divider current error. |
| Average Input Current Limit Accuracy | ±5% - ensures reliable USB port compliance and prevents host supply collapse during high peak load transients. |
| Shutdown Quiescent Current | ≤1µA - extends battery life in always-on systems requiring deep sleep modes between active bursts. |
| Thermal Resistance (θJA) | 45°C/W - defined for 10-lead MSOP package with exposed GND pad soldered to PCB, enabling >600mA continuous output at 85°C ambient. |
Pinout & Package
The LTC3619BEMSE#TRPBF is housed in a thermally enhanced 10-lead plastic MSOP package (3mm × 3mm footprint, 1.1mm height) with an exposed GND pad (Pin 11) that must be soldered to the PCB for optimal 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 by comparing to 0.6V internal reference. |
| RUN1 (Pin 2) | Channel 1 enable control | Logic-high (>1.2V) enables Channel 1; logic-low (<0.4V) shuts down with ≤1µA quiescent current. |
| RLIM (Pin 3) | Input current limit programming | Resistor-to-GND sets average input current limit (e.g., 116kΩ = 475mA); capacitor adds filtering for transient response tuning. |
| PGOOD1 (Pin 4) | Channel 1 power-good indicator | Open-drain output pulled low if VFB1 deviates >±7% from 0.6V; 90µs blanking avoids false triggers during startup. |
| SW1 (Pin 5) | Channel 1 switch node | Connects to inductor; swings between VIN and GND; requires low-ESR ceramic bypass capacitor near pin. |
| VIN (Pin 6) | Main power input | Supplies both channels; must be decoupled with ≥10µF ceramic capacitor placed adjacent to pin. |
| SW2 (Pin 7) | Channel 2 switch node | Independent switch node for second buck stage; shares VIN but has separate inductor and output filter. |
| PGOOD2 (Pin 8) | Channel 2 power-good indicator | Functionally identical to PGOOD1 but monitors VFB2; enables independent rail sequencing and fault isolation. |
| RUN2 (Pin 9) | Channel 2 enable control | Independent enable for Channel 2; allows staggered startup or dynamic rail disabling without affecting Channel 1. |
| VFB2 (Pin 10) | Channel 2 feedback input | Same 0.6V reference as VFB1; supports independent output voltage setting (e.g., 3.3V + 1.8V). |
| GND (Pin 11) | Power and signal ground | Exposed thermal pad; must be soldered to large PCB copper area for thermal dissipation and low-noise grounding. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable average input current limit | Enables USB-compliant designs by preventing host supply droop during burst loads-set via single RLIM resistor with ±5% accuracy. |
| Dual independent soft-start | Each channel ramps output over ~950µs to limit inrush current; prevents input capacitor stress and avoids triggering upstream current limits. |
| 100% duty cycle low-dropout operation | Maintains regulation as VIN approaches VOUT by fully enhancing the P-channel MOSFET-critical for battery end-of-life runtime extension. |
| Current-mode control with fast transient response | Internal slope compensation and cycle-by-cycle peak current limiting deliver <10µs recovery from 80% load steps with minimal output deviation. |
| Short-circuit protected with automatic recovery | Forces extended N-FET conduction during output shorts to safely discharge inductor energy; resumes normal regulation immediately after fault removal. |
Applications
| USB-Powered Portable Instruments | RF Transmitter Power Management |
|---|---|
Use Scenario: Handheld spectrum analyzers or portable oscilloscopes powered directly from USB-C ports with strict 500mA input current limits. IC Role / Device Role / Timing Role: Dual-buck regulator providing isolated 3.3V analog and 1.8V digital rails while enforcing 475mA total input current to stay within USB specification. Use Value: Prevents host port shutdown during measurement bursts by limiting input current without collapsing output voltages-enabling reliable field-deployable operation. | Use Scenario: LTE/GSM module in battery-operated trackers requiring pulsed 2A RF PA current while maintaining stable 3.4V supply. IC Role / Device Role / Timing Role: Supplies 800mA Channel 2 to RF PA with programmable input current limit; Channel 1 powers baseband at 400mA with independent sequencing. Use Value: Delivers high peak PA current without violating USB or battery source limits-input current limiting engages only on summed channel demand, preserving headroom for digital logic. |
| Supercapacitor Backup Systems | Multi-Rail Embedded Controllers |
Use Scenario: Industrial sensor nodes using supercapacitors for backup power during main supply interruption, requiring controlled charge/discharge profiles. IC Role / Device Role / Timing Role: Uses Channel 2 as a constant-current supercapacitor charger (via RLIM programming) and Channel 1 as main system regulator. Use Value: Eliminates need for discrete charge controller IC-enables accurate 475mA charging current with thermal foldback and PGOOD status reporting. | Use Scenario: Edge AI inference modules with ARM Cortex-A series SoC requiring tightly regulated 1.2V core, 3.3V I/O, and 1.8V memory rails. IC Role / Device Role / Timing Role: Provides two independent, high-efficiency buck outputs with ±2% output accuracy and PGOOD monitoring per rail for safe boot sequencing. Use Value: Reduces BOM count versus discrete regulators; 2.25MHz operation minimizes inductor size for space-constrained PCB layouts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62150ARGTR | Single-channel 1A buck; no dual output or input current limiting; 2.25MHz fixed frequency; 2.5–6V input. | Requires two ICs for dual-rail designs; lacks RLIM-based input current control for USB compliance. | Choose when only one regulated rail is needed and input current limiting is handled externally. |
| LTC3619EMSE#TRPBF | Burst Mode® variant with lower quiescent current (25µA vs 600µA active); same pinout, package, and feature set except light-load operation mode. | Better suited for battery-critical applications with long idle periods; slightly reduced light-load efficiency above 1mA due to Burst Mode switching artifacts. | Select LTC3619BEMSE#TRPBF for low-noise pulse-skipping at light loads; choose LTC3619EMSE#TRPBF for ultra-low IQ in always-on sensing nodes. |
Compared with TPS62150ARGTR, the LTC3619BEMSE#TRPBF integrates dual regulation and USB-safe input current limiting in one package, eliminating layout complexity and component count. Against LTC3619EMSE#TRPBF, it trades 25µA IQ for superior light-load noise performance and smoother transition into pulse-skipping mode-critical for sensitive analog or RF subsystems.
Availability
LTC3619BEMSE#TRPBF is available at Aetrix Electronics and suitable for USB-powered handheld instruments, RF transmitter modules, supercapacitor backup systems, and multi-rail embedded controllers requiring stable component supply and guaranteed long-term availability.
Supply support for LTC3619BEMSE#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 leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, formed through the acquisition of Linear Technology in 2017.
The LTC3619BEMSE#TRPBF belongs to ADI's Power by Linear™ family of high-efficiency DC/DC converters, designed specifically for space-constrained, battery-sensitive applications demanding precision regulation, robust protection, and USB-compliant power delivery.
FAQ
What is the maximum output current capability of each channel in the LTC3619BEMSE#TRPBF?
The LTC3619BEMSE#TRPBF delivers up to 400mA on Channel 1 and 800mA on Channel 2 under typical conditions (VIN = 5V, TA = 25°C, with proper thermal design). Peak switch current limits are 800mA (Ch1) and 2.4A (Ch2), but sustained output is constrained by thermal limits in the MSOP package. Derating is required above 85°C ambient temperature.
How does the programmable input current limit function in the LTC3619BEMSE#TRPBF?
The LTC3619BEMSE#TRPBF uses an external resistor (RLIM) from Pin 3 to GND to set the average input current limit. For example, 116kΩ programs a 475mA limit with ±5% accuracy. When the summed input current of both channels exceeds this value, Channel 2 is current-limited while Channel 1 remains fully regulated-preserving critical system rails during transient overload.
Can the LTC3619BEMSE#TRPBF operate with input voltage down to 2.5V while maintaining regulation?
Yes, the LTC3619BEMSE#TRPBF operates across 2.5V to 5.5V input. At low VIN, it achieves 100% duty cycle to maintain output regulation-critical for extending runtime in Li-ion battery applications where voltage drops to 2.7V–3.0V under load. The P-channel MOSFET's RDS(ON) increases at lower VIN, so thermal design must account for worst-case power dissipation.
What is the purpose of the CLIM capacitor connected to the RLIM pin of the LTC3619BEMSE#TRPBF?
The CLIM capacitor (e.g., 2200pF) on the RLIM pin integrates the input current sense signal to smooth transient spikes and set the response time of the input current limit function. A larger CLIM delays limit activation (e.g., 110ms for 1µF), allowing brief high-current pulses; a smaller CLIM (e.g., 2.2nF) responds in ~92µs-ideal for fast GSM pulse loads. Minimum value is 100pF for stability.
Does the LTC3619BEMSE#TRPBF support independent power sequencing between its two output channels?
Yes, the LTC3619BEMSE#TRPBF supports full independent sequencing via separate RUN1 (Pin 2) and RUN2 (Pin 9) enable inputs. Each channel has its own soft-start (~950µs ramp) and PGOOD output (Pins 4 and 8), enabling precise turn-on order, fault isolation, and reset coordination in complex multi-rail systems without external timing components.
LTC3619BEMSE#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad
- Packaging:
- Tape & Reel (TR)
- 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#TRPBF FAQ
1.How can I place an order for LTC3619BEMSE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3619BEMSE#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 LTC3619BEMSE#TRPBF reliable?
The price and inventory of LTC3619BEMSE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3619BEMSE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3619BEMSE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3619BEMSE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3619BEMSE#TRPBF?
LTC3619BEMSE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3619BEMSE#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 LTC3619BEMSE#TRPBF?
For technical support, including LTC3619BEMSE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3619BEMSE#TRPBF requirements.
6.How does Aetrix verify that LTC3619BEMSE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3619BEMSE#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 LTC3619BEMSE#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3619BEMSE#TRPBF?
All LTC3619BEMSE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3619BEMSE#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 LTC3619BEMSE#TRPBF part is unused and in its original packaging.
Return procedure for LTC3619BEMSE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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