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Analog Devices Inc. LTC3619BIMSE#TRPBF
- Part No.:
- LTC3619BIMSE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3619BIMSE#TRPBF.pdf
- Description:
- IC REG BUCK ADJ DL 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,900
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Product details
Overview
LTC3619BIMSE#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 LTC3619BIMSE#TRPBF datasheet, LTC3619BIMSE#TRPBF pinout, LTC3619BIMSE#TRPBF application, or LTC3619BIMSE#TRPBF equivalent, key selection criteria include input current limit programming via RLIM, dual-channel PGOOD monitoring, thermal performance in MSOP-10 package, and compatibility with low-ESR ceramic output capacitors in compact Li-ion–powered systems.
Technical Context
The LTC3619BIMSE#TRPBF implements two independent current-mode buck regulators sharing a synchronized 2.25MHz clock, enabling tight transient response and reduced EMI. 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, supporting 100% duty cycle for low-dropout operation.
Input current limiting is achieved by summing scaled inductor current signals from both channels at the RLIM pin; when total input current exceeds the programmed threshold, only Channel 2 is current-limited while Channel 1 remains fully regulated. Power-good outputs (PGOOD1/PGOOD2) provide open-drain voltage monitoring with ±7% window 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 independent powering of core logic and RF subsystems in portable devices. |
| Switching Frequency | 2.25MHz (typ) - permits use of sub-3mm surface-mount inductors (e.g., 2.2µH–4.7µH) and reduces output capacitor size. |
| Feedback Reference Voltage | 0.6V ±2% - allows precise low-voltage regulation (e.g., 1.2V, 1.8V, 3.3V) using standard resistor dividers with minimal divider current error. |
| Average Input Current Limit Accuracy | ±5% - ensures reliable compliance with USB 2.0 500mA or USB 3.0 900mA host port limits under varying temperature and VIN. |
| Shutdown Quiescent Current | ≤1µA - preserves battery life during system sleep modes in always-on sensor or IoT edge nodes. |
| Operating Junction Temperature | –40°C to +125°C - qualified for industrial and automotive cabin applications with validated thermal resistance θJA = 45°C/W (MSOP). |
Pinout & Package
Package: 10-Lead Plastic MSOP (MSE), thermally enhanced with exposed GND pad (Pin 11). Requires soldering of exposed pad to PCB ground plane for optimal thermal performance and EMI reduction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VFB1 (Pin 1) | Channel 1 feedback input | Connects to resistive divider from VOUT1; regulates output by comparing to 0.6V internal reference. |
| RUN1 (Pin 2) | Channel 1 enable control | Logic-high (>1.2V) enables Ch1; logic-low (<0.4V) forces shutdown with ≤1µA quiescent current. |
| RLIM (Pin 3) | Input current limit programming | Resistor-to-GND sets average input current limit (e.g., 116kΩ = 475mA); CLIM capacitor filters transient sensing. |
| PGOOD1 (Pin 4) | Channel 1 power-good indicator | Open-drain output pulled low when VFB1 deviates >±7% from 0.6V; requires external pull-up. |
| SW1 (Pin 5) | Channel 1 switch node | Connects to inductor; swings between VIN and GND; requires low-inductance layout to minimize EMI. |
| 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 high-side switching node for Ch2; layout symmetry recommended to balance thermal stress. |
| PGOOD2 (Pin 8) | Channel 2 power-good indicator | Functionally identical to PGOOD1 but monitors VFB2; enables independent rail sequencing verification. |
| RUN2 (Pin 9) | Channel 2 enable control | Independent enable/disable control for Ch2; supports staggered startup or dynamic power partitioning. |
| VFB2 (Pin 10) | Channel 2 feedback input | Same function as VFB1 but for Ch2; allows independent output voltage setting (e.g., 1.2V + 3.3V). |
| GND (Pin 11) | Power and signal ground | Exposed thermal pad; must be soldered to large PCB copper area for thermal dissipation and noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable average input current limit | Enables USB-compliant designs without external current-sense ICs; ±5% accuracy over –40°C to 125°C eliminates calibration. |
| Dual independent soft-start | Each channel ramps output over ~950µs to prevent inrush into large output capacitance (e.g., supercapacitors), reducing stress on input source. |
| Pulse-skipping mode at light loads | Maintains low output ripple and <10mVPP noise while achieving >85% efficiency at 1mA load-critical for RF-sensitive receivers. |
| 100% duty cycle low-dropout operation | Extends battery runtime by sustaining regulation down to VIN – VOUT ≈ 0.2V (at 400mA), minimizing voltage headroom loss. |
| Short-circuit protection with frequency foldback | Prevents thermal runaway during output shorts by extending bottom-FET on-time and reducing switching frequency-no external components needed. |
Applications
| USB-Powered Portable Devices | Supercapacitor Backup Power Systems |
|---|---|
Use Scenario: Powering dual-rail subsystems (e.g., 1.8V SoC core + 3.3V I/O) from a single USB 2.0 port with strict 500mA input limit. IC Role / Device Role / Timing Role: Dual-channel buck regulator enforcing average input current limit while maintaining independent output regulation and sequencing. Use Value: Eliminates need for external current-limiting circuitry; enables full USB compliance without sacrificing peak load capability (e.g., GSM pulse load up to 2.2A). | Use Scenario: Charging and regulating supercapacitors used for backup power in real-time clocks or SRAM retention during main supply failure. IC Role / Device Role / Timing Role: Constant-current/constant-voltage charger with programmable input current limit and precise 0.6V feedback for accurate end-of-charge detection. Use Value: Prevents overcurrent stress on USB source during bulk charge; enables fast recharge (≤10s) using 475mA limit and 2.25MHz switching. |
| GSM/GPRS Radio Transmitters | Industrial Handheld Meters |
Use Scenario: Supplying burst-mode RF power amplifier (PA) requiring high peak current (e.g., 2A pulses) while maintaining stable 3.3V VCC from limited-capacity Li-ion battery. IC Role / Device Role / Timing Role: Dual-output regulator where Channel 2 delivers pulsed PA current while Channel 1 powers baseband processor with unregulated input current. Use Value: Input current limiting prevents battery voltage collapse during PA bursts; 100% duty cycle extends usable battery range by 12% vs. non-dropout regulators. | Use Scenario: Powering microcontroller, display, and sensor interface in battery-operated utility meters with 10-year field lifetime requirements. IC Role / Device Role / Timing Role: Primary DC/DC converter providing isolated, low-noise 1.2V and 3.3V rails with guaranteed –40°C to +125°C operation and <1µA shutdown current. Use Value: Meets extended temperature qualification without derating; pulse-skipping mode maintains <25µA system sleep current, enabling decade-long battery life. |
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 |
|---|---|---|---|
| TPS62125DSCR | Single-channel, 300mA output; no input current limit; 2.25MHz fixed frequency; 0.6V reference. | Lacks dual output and programmable input current limiting-requires external circuitry for USB compliance. | Select when only one regulated rail is needed and input current control is handled upstream. |
| LTC3619EMSE#TRPBF | Same pinout and functionality but rated for 0°C to 85°C junction temperature (vs. –40°C to 125°C for LTC3619BIMSE#TRPBF). | Not qualified for extended industrial or automotive ambient conditions; lower thermal margin in sealed enclosures. | Choose for cost-sensitive commercial applications with controlled thermal environments. |
Compared with TPS62125DSCR and LTC3619EMSE#TRPBF, the LTC3619BIMSE#TRPBF uniquely combines dual independent outputs, ±5% programmable input current limiting, and full –40°C to +125°C qualification-making it the only option for compact, USB-compliant, wide-temperature dual-rail power in handheld industrial tools.
Availability
LTC3619BIMSE#TRPBF is available at Aetrix Electronics and suitable for USB-powered portable devices, supercapacitor backup systems, GSM radio transmitters, and industrial handheld meters requiring stable component supply across extended temperature ranges.
Supply support for LTC3619BIMSE#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 its high-performance analog and power management portfolio with rigorous automotive and industrial qualification standards.
The LTC3619B belongs to Linear's monolithic synchronous buck regulator family, designed specifically for space-constrained, battery-powered applications demanding precise input current control, dual independent outputs, and robust thermal performance in small MSOP and DFN packages.
FAQ
What is the maximum output current per channel for the LTC3619BIMSE#TRPBF?
The LTC3619BIMSE#TRPBF delivers up to 400mA on Channel 1 and 800mA on Channel 2 under typical conditions (VIN = 5V, TA = 25°C). These values are specified with appropriate thermal management-using the exposed GND pad-and assume proper inductor selection (e.g., 3.3µH, 1.5A saturation current) and layout. Derating applies at elevated ambient temperatures or higher VIN–VOUT differentials.
How do I program the input current limit on the LTC3619BIMSE#TRPBF?
Set the input current limit on the LTC3619BIMSE#TRPBF by connecting a resistor (RLIM) from Pin 3 (RLIM) to GND. For example, a 116kΩ resistor programs a 475mA limit. The relationship is RLIM = 55kΩ/A, where A is the desired input current in amperes. A capacitor (CLIM) ≥100pF must also be placed from RLIM to GND to filter switching noise and stabilize current sensing.
Does the LTC3619BIMSE#TRPBF support 100% duty cycle operation?
Yes, the LTC3619BIMSE#TRPBF supports true 100% duty cycle operation, allowing VOUT to track VIN minus conduction losses through the internal P-channel MOSFET and inductor. This feature extends battery runtime in low-VIN scenarios (e.g., single-cell Li-ion dropping to 3.0V while regulating 2.8V), with dropout voltage dependent on RDS(ON) and load current.
What is the purpose of the PGOOD pins on the LTC3619BIMSE#TRPBF?
The PGOOD1 and PGOOD2 pins on the LTC3619BIMSE#TRPBF are open-drain outputs that indicate valid regulation: they pull low when the respective VFB pin voltage deviates more than ±7% from 0.6V. Each includes 90µs blanking after startup or fault recovery. These signals enable system-level power sequencing, fault logging, or automatic reset assertion in microcontroller-based designs using the LTC3619BIMSE#TRPBF.
Can the LTC3619BIMSE#TRPBF operate with input voltages below 2.5V?
No-the absolute minimum operating input voltage for the LTC3619BIMSE#TRPBF is 2.5V, as specified in the Electrical Characteristics table. Operation below this violates the guaranteed performance envelope; undervoltage lockout activates below 2.1V (typical), disabling both channels. For sub-2.5V inputs, consider alternative regulators such as the LTC3522 or discrete boost+buck solutions.
LTC3619BIMSE#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
LTC3619BIMSE#TRPBF FAQ
1.How can I place an order for LTC3619BIMSE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3619BIMSE#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 LTC3619BIMSE#TRPBF reliable?
The price and inventory of LTC3619BIMSE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3619BIMSE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3619BIMSE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3619BIMSE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3619BIMSE#TRPBF?
LTC3619BIMSE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3619BIMSE#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 LTC3619BIMSE#TRPBF?
For technical support, including LTC3619BIMSE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3619BIMSE#TRPBF requirements.
6.How does Aetrix verify that LTC3619BIMSE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3619BIMSE#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 LTC3619BIMSE#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3619BIMSE#TRPBF?
All LTC3619BIMSE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3619BIMSE#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 LTC3619BIMSE#TRPBF part is unused and in its original packaging.
Return procedure for LTC3619BIMSE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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