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Analog Devices Inc. LTC3619IMSE#TRPBF
- Part No.:
- LTC3619IMSE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3619IMSE#TRPBF.pdf
- Description:
- IC REG BUCK ADJ DL 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,443
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Product details
Overview
LTC3619IMSE#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 power-good outputs - ideal for USB-powered handheld devices requiring stable dual-rail power with input current compliance.
For engineers reviewing the LTC3619IMSE#TRPBF datasheet, LTC3619IMSE#TRPBF pinout, LTC3619IMSE#TRPBF application, or LTC3619IMSE#TRPBF equivalent, key selection criteria include dual-output current capability, input current limit programming via RLIM, thermal performance in MSOP-10 package, and Burst Mode® operation for ultra-low IQ (50µA) in light-load scenarios.
Technical Context
The LTC3619IMSE#TRPBF implements a dual-channel, in-phase, constant-frequency (2.25MHz) current-mode architecture sharing one oscillator. Each channel uses independent error amplifiers, soft-start timers, and power-good comparators referenced to a precision 0.6V internal bandgap.
Input current limiting is achieved by summing scaled inductor current representations from both channels at the RLIM pin; when the integrated current exceeds 1V threshold, Channel 2 enters current-limit mode while Channel 1 remains fully regulated - enabling high peak output loads without collapsing the input supply.
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 regulation. |
| Output Current Capability | Channel 1: 400mA; Channel 2: 800mA - enables independent powering of core logic and I/O rails. |
| Switching Frequency | 2.25MHz (±25%) - allows use of compact 1µH–3.3µH surface-mount inductors and reduces EMI fundamental frequency. |
| Feedback Reference Voltage | 0.6V ±2% - supports low-output voltages (e.g., 1.2V, 1.8V) with standard resistor dividers and tight DC regulation. |
| Average Input Current Limit Accuracy | ±5% - ensures reliable USB port compliance and prevents host-supply brownout during transient load steps. |
| Quiescent Current (Burst Mode) | 50µA - extends battery runtime in standby or low-duty-cycle wireless sensor nodes. |
| Operating Junction Temperature | –40°C to +125°C - qualified for industrial and automotive under-hood auxiliary power applications. |
Pinout & Package
Package: 10-Lead Plastic MSOP with exposed pad (GND); thermally enhanced, θJA = 45°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VFB1 (Pin 1) | Channel 1 Feedback Input | Connects to resistive divider; regulates VOUT1 to 0.6V reference - sets output voltage independently of Channel 2. |
| RUN1 (Pin 2) | Channel 1 Enable Control | Logic-high (>0.4V) enables Channel 1; pulled low disables regulator and reduces shutdown current to ≤1µA. |
| RLIM (Pin 3) | Input Current Limit Programming | Resistor-to-GND sets average input current limit (e.g., 116kΩ = 475mA); capacitor filters transients for stable limit response. |
| PGOOD1 (Pin 4) | Channel 1 Power-Good Monitor | Open-drain output asserts low when VFB1 deviates >±5% from 0.6V - used for system sequencing and fault reporting. |
| SW1 (Pin 5) | Channel 1 Switch Node | Connects to inductor; swings between VIN and GND - requires low-ESR ceramic output capacitor and careful layout for EMI control. |
| VIN (Pin 6) | Main Power Input | Supplies both channels; must be decoupled with ≥10µF ceramic + 0.1µF high-frequency cap close to pin. |
| SW2 (Pin 7) | Channel 2 Switch Node | Independent switch node for Channel 2; supports asymmetric inductor selection vs. Channel 1. |
| PGOOD2 (Pin 8) | Channel 2 Power-Good Monitor | Functionally identical to PGOOD1 but for VOUT2 - enables independent rail monitoring in multi-voltage systems. |
| RUN2 (Pin 9) | Channel 2 Enable Control | Independent enable/disable control for Channel 2 - supports dynamic power gating of peripherals. |
| VFB2 (Pin 10) | Channel 2 Feedback Input | Separate feedback path enables different output voltages per channel (e.g., 1.2V + 3.3V) without interaction. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent soft-start | Each channel ramps output over ~950µs - prevents inrush current into large output capacitors and avoids input supply sag. |
| 100% duty-cycle low-dropout operation | Maintains regulation down to VOUT ≈ VIN − (IOUT × RDS(ON)) - extends battery runtime in deep discharge conditions. |
| Short-circuit protection | Forces extended N-FET conduction to safely discharge inductor during output short - prevents current runaway without latch-off. |
| Current-mode transient response | Fast line/load step recovery (<10µs settling) due to cycle-by-cycle peak current control - critical for RF transmitter pulse loads. |
| Burst Mode® low-noise operation | Delivers <25mVP-P output ripple at light loads while maintaining 50µA IQ - eliminates audible coil whine and reduces standby power. |
Applications
| USB-Powered Portable Instrumentation | GSM/GPRS Radio Transmitter Modules |
|---|---|
Use Scenario: Handheld multimeter or data logger powered directly from USB 5V bus with dual-rail requirements (3.3V MCU + 1.8V sensor interface). IC Role / Device Role / Timing Role: Dual buck regulator providing isolated, current-limited 3.3V and 1.8V supplies - Channel 2 delivers higher current for RF front-end while Channel 1 powers low-power logic. Use Value: Programmable 475mA input current limit prevents USB port overcurrent shutdown during GSM burst transmission peaks. | Use Scenario: Cellular IoT module with pulsed TX load (2A for 577µs every 4.7ms) and strict USB-compliant input sourcing. IC Role / Device Role / Timing Role: Synchronous buck controller managing high-peak, low-duty-cycle RF power delivery while maintaining stable 3.4V VOUT2 at 800mA continuous. Use Value: RLIM+CLIM configuration enables precise input current limiting response within 92µs - sustains VOUT during GSM pulse without violating USB 500mA spec. |
| Supercapacitor Backup Power Systems | Industrial Sensor Node Power Management |
Use Scenario: Energy-harvesting node using supercapacitor charged from solar cell, requiring regulated 3.3V and 1.2V rails during intermittent operation. IC Role / Device Role / Timing Role: Dual-output buck converter with Burst Mode® operation - Channel 1 powers microcontroller at 1.2V, Channel 2 supplies 3.3V to RF transceiver only during transmission. Use Value: 50µA quiescent current in Burst Mode® maximizes supercapacitor hold-up time; 0.6V reference enables accurate low-voltage regulation as capacitor discharges. | Use Scenario: Factory-floor temperature/humidity sensor with isolated 24V loop-powered input and 3.3V/1.8V digital subsystems. IC Role / Device Role / Timing Role: Primary DC/DC regulator converting 5V derived from 24V loop supply into two independent, thermally robust output rails. Use Value: –40°C to +125°C operating range and 45°C/W θJA ensure reliability in uncontrolled industrial enclosures; PGOOD outputs feed watchdog circuitry. |
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 |
|---|---|---|---|
| TPS62125RGTR | Single-channel, 300mA output; no input current limit; 2.25MHz fixed frequency; 0.6V reference. | Lacks dual output and programmable input current limiting - suitable only for single-rail, non-USB applications. | Select only if system requires only one regulated rail and does not need input current compliance. |
| LTC3619BIMSE#TRPBF | Pin-compatible variant with low-noise pulse-skipping mode instead of Burst Mode®; identical pinout, specs, and package. | Optimized for noise-sensitive analog/RF sections where Burst Mode® switching artifacts are unacceptable. | Choose LTC3619BIMSE#TRPBF when EMI-sensitive signal chains require lower output voltage ripple at light loads. |
Compared with TPS62125RGTR and LTC3619BIMSE#TRPBF, the LTC3619IMSE#TRPBF uniquely delivers dual independent outputs with programmable input current limiting - making it the only option among the three that satisfies USB-powered dual-rail designs with peak load handling and input supply protection.
Availability
LTC3619IMSE#TRPBF is available at Aetrix Electronics and suitable for USB-powered portable instrumentation, GSM radio transmitter modules, supercapacitor backup systems, and industrial sensor nodes requiring stable component supply with guaranteed long-term availability.
Supply support for LTC3619IMSE#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 LTC3619IMSE#TRPBF belongs to ADI's Power by Linear™ family of high-efficiency DC/DC regulators, designed specifically for space-constrained, battery- and USB-powered applications demanding precision regulation, low IQ, and robust transient response.
FAQ
What is the maximum output current capability of each channel in the LTC3619IMSE#TRPBF?
The LTC3619IMSE#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 and external components; derating applies at elevated ambient temperatures or reduced input voltage. The device maintains regulation even at 100% duty cycle, supporting low-dropout operation critical for battery-powered systems.
How is the average input current limit programmed on the LTC3619IMSE#TRPBF?
The LTC3619IMSE#TRPBF uses an external resistor (RLIM) from Pin 3 to GND to set the average input current limit. For example, a 116kΩ resistor programs a 475mA limit (RLIM = 55kΩ / IDC). A capacitor (CLIM) in parallel with RLIM filters transients - typical values range from 2200pF (fast response) to 0.1µF (slower, more stable limit engagement). Grounding RLIM disables the function entirely.
Does the LTC3619IMSE#TRPBF support independent enable control for each channel?
Yes, the LTC3619IMSE#TRPBF provides fully independent enable control: RUN1 (Pin 2) controls Channel 1 and RUN2 (Pin 9) controls Channel 2. Each pin is active-high with a threshold of 0.4V–1.2V; pulling either pin low disables its respective regulator and reduces quiescent current to ≤1µA. This enables flexible power sequencing and dynamic rail gating in multi-voltage systems.
What is the purpose of the exposed pad on the LTC3619IMSE#TRPBF MSOP package?
The exposed pad (Pin 11) on the LTC3619IMSE#TRPBF MSOP package is electrically and thermally connected to GND. It must be soldered to a PCB copper pour to achieve the specified θJA = 45°C/W and ensure reliable thermal performance. Failure to connect this pad degrades power dissipation capability and may cause thermal shutdown under sustained load conditions.
Can the LTC3619IMSE#TRPBF operate with output voltages below 1.0V?
Yes, the LTC3619IMSE#TRPBF supports output voltages as low as 0.6V due to its precision 0.6V feedback reference. Using standard resistor dividers (e.g., 100kΩ top / 100kΩ bottom for 1.2V), it achieves ±2% output voltage accuracy across temperature and load. For sub-1.0V outputs, use high-precision, low-tempco resistors and minimize PCB trace resistance to maintain accuracy.
LTC3619IMSE#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
LTC3619IMSE#TRPBF FAQ
1.How can I place an order for LTC3619IMSE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3619IMSE#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 LTC3619IMSE#TRPBF reliable?
The price and inventory of LTC3619IMSE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3619IMSE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3619IMSE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3619IMSE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3619IMSE#TRPBF?
LTC3619IMSE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3619IMSE#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 LTC3619IMSE#TRPBF?
For technical support, including LTC3619IMSE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3619IMSE#TRPBF requirements.
6.How does Aetrix verify that LTC3619IMSE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3619IMSE#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 LTC3619IMSE#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3619IMSE#TRPBF?
All LTC3619IMSE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3619IMSE#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 LTC3619IMSE#TRPBF part is unused and in its original packaging.
Return procedure for LTC3619IMSE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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