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Analog Devices Inc. LTC3619IDD#TRPBF
- Part No.:
- LTC3619IDD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LTC3619IDD#TRPBF.pdf
- Description:
- IC REG BUCK ADJ DL 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,829
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Product details
Overview
LTC3619IDD#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-designed for USB-powered portable devices requiring stable dual-rail power with input current compliance.
For engineers reviewing the LTC3619IDD#TRPBF datasheet, LTC3619IDD#TRPBF pinout, LTC3619IDD#TRPBF application, or LTC3619IDD#TRPBF equivalent, this page delivers verified technical context, validated pin functions, confirmed thermal and efficiency behavior at 125°C junction, and real-world alternative selection guidance for dual-output point-of-load designs.
Technical Context
The LTC3619IDD#TRPBF implements two independent current-mode buck regulators sharing a synchronized 2.25MHz clock, each with dedicated RUN, PGOOD, VFB, and SW pins. Its input current limit is programmed via RLIM pin using an external resistor-capacitor network, and channel priority is enforced: when total input current exceeds the limit, Channel 2 enters current limiting while Channel 1 remains fully regulated.
Operation includes low-dropout 100% duty cycle capability, Burst Mode® for <25mVP-P ripple and 50µA quiescent current at light load, and ±2% output voltage accuracy over –40°C to 125°C. Short-circuit protection forces extended bottom-FET conduction to safely discharge inductors during fault conditions.
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 (Ch1 / Ch2) | 400mA / 800mA - enables independent powering of core logic and I/O rails in space-constrained handhelds. |
| Switching Frequency | 2.25MHz (typ) - permits use of ≤1.5µH inductors and compact ceramic output capacitors. |
| Feedback Reference | 0.6V ±2% - allows precise low-voltage outputs (e.g., 1.2V, 1.8V) with standard resistor dividers. |
| Avg Input Current Limit | Programmable 427–523mA (LTC3619I grade) - enforces USB-compliant sourcing while sustaining high peak loads. |
| Quiescent Current | 50µA in Burst Mode - extends battery runtime in always-on sensor or standby subsystems. |
| Junction Temp Range | –40°C to +125°C - qualified for automotive cabin, industrial edge, and ruggedized portable applications. |
Pinout & Package
Package: 10-lead 3mm × 3mm plastic DFN with exposed thermal pad (Pin 11 = GND). Thermally enhanced for 40°C/W θJA in standard PCB layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VFB1 (Pin 1) | Channel 1 feedback input | Connects to resistive divider; regulates output by comparing to 0.6V internal reference. |
| RUN1 (Pin 2) | Channel 1 enable control | High (>0.4V) enables regulator; low (<0.1V) shuts down with ≤1μA shutdown current. |
| RLIM (Pin 3) | Input current limit programming | Resistor-to-GND sets average input limit; capacitor filters transient sensing current. |
| PGOOD1 (Pin 4) | Channel 1 power-good indicator | Open-drain output asserts low when VFB1 is within ±5% to ±11% window of regulation. |
| SW1 (Pin 5) | Channel 1 switch node | Connects to inductor; swings between VIN and GND; requires low-inductance layout. |
| VIN (Pin 6) | Main power input | Supplies both channels; must be decoupled with ≥10µF ceramic + 0.1µF high-frequency cap. |
| SW2 (Pin 7) | Channel 2 switch node | Independent switch node; same topology as SW1 but rated for higher peak current (2A). |
| PGOOD2 (Pin 8) | Channel 2 power-good indicator | Functionally identical to PGOOD1 but monitors VFB2; enables sequencing or fault isolation. |
| RUN2 (Pin 9) | Channel 2 enable control | Independent enable; allows staggered startup or dynamic rail disable for power management. |
| VFB2 (Pin 10) | Channel 2 feedback input | Same 0.6V reference as VFB1; supports different output voltages per channel. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent soft-start | 0.95ms ramp time per channel prevents inrush into large output caps without external circuitry. |
| Programmable input current limit | ±5% accuracy across temperature ensures USB 500mA compliance without margin oversizing. |
| Burst Mode® operation | <25mVP-P output ripple at light load with 50µA IQ - eliminates audible noise and preserves efficiency. |
| 100% duty cycle dropout | Maintains regulation down to VOUT ≈ VIN − (IOUT × RDS(ON)_PFET) - extends battery runtime in deep discharge. |
| Short-circuit protection | Automatic foldback via extended N-FET conduction - protects inductors and MOSFETs during sustained faults. |
Applications
| USB-Powered Portable Devices | Industrial IoT Edge Nodes |
|---|---|
|
Use Scenario: Powering microcontroller, RF transceiver, and sensors from a single USB port in handheld test equipment. IC Role / Device Role / Timing Role: Dual-output buck regulator providing 1.8V for MCU core and 3.3V for radio interface, with input current capping at 475mA. Use Value: Prevents host USB port overcurrent shutdown while delivering peak 1.2A combined load during transmit bursts. |
Use Scenario: Distributed sensor node operating in unattended factory environments with wide ambient temperature swings. IC Role / Device Role / Timing Role: Primary DC/DC converter supplying isolated 3.3V and 5V rails to analog front-end and digital logic under –40°C to +125°C conditions. Use Value: Guaranteed ±2% output accuracy and 125°C-rated operation eliminate need for derating or thermal throttling. |
| Supercapacitor Backup Systems | GSM/GPRS Pulse-Load Transmitters |
|
Use Scenario: Charging and regulating supercapacitor bank used for short-term backup during main power loss. IC Role / Device Role / Timing Role: Constant-current charger (via RLIM programming) and regulated discharge path for supercap bank feeding critical memory or RTC. Use Value: Programmable input current limit enables controlled 475mA charge rate; 100% duty cycle sustains output as supercap voltage decays. |
Use Scenario: Powering GSM module transmitting 2A pulses every 4.7ms in mobile asset trackers. IC Role / Device Role / Timing Role: Dual-channel supply where Channel 2 powers PA (800mA avg, 2A peak) and Channel 1 powers baseband (400mA). Use Value: Input current limiting engages only after ~92µs delay (with 2.2nF CLIM), allowing full peak delivery before regulation intervenes. |
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 |
|---|---|---|---|
| TPS62150ARGTR | Single-output 1A buck; no input current limit; 2.5–6V input; 3mm × 3mm QFN-16 | Lacks dual-rail capability and programmable input current limiting - requires two ICs for same function. | Select only if single-rail design suffices and USB compliance is handled externally. |
| LTC3619BIDD#TRPBF | Pulse-skipping variant with lower noise; identical pinout, specs, and package; optimized for EMI-sensitive RF sections | Same thermal and electrical performance but reduced switching artifacts - preferred for radio co-location. | Choose LTC3619BIDD#TRPBF when low-noise operation near sensitive receivers is mandatory. |
Compared with TPS62150ARGTR and LTC3619BIDD#TRPBF, the LTC3619IDD#TRPBF uniquely combines dual independent outputs, USB-compliant input current limiting, and guaranteed 125°C operation in a 10-pin DFN-enabling compact, thermally robust, and standards-compliant dual-rail power without additional ICs or external current-sense circuitry.
Availability
LTC3619IDD#TRPBF is available at Aetrix Electronics and suitable for USB-powered portable devices, industrial IoT edge nodes, supercapacitor backup systems, and GSM pulse-load transmitters requiring stable component supply across extended temperature ranges.
Supply support for LTC3619IDD#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 precision power management portfolio with rigorous automotive and industrial qualification.
The LTC3619IDD#TRPBF belongs to Linear's high-efficiency monolithic buck regulator family, engineered for space-constrained, thermally demanding applications where dual independent outputs and strict input current control are essential.
FAQ
What is the maximum junction temperature rating for the LTC3619IDD#TRPBF?
The LTC3619IDD#TRPBF is specified for operation from –40°C to +125°C junction temperature. This I-grade rating is validated across all electrical parameters in the datasheet, including input current limit accuracy, output voltage regulation, and Burst Mode® functionality - making it suitable for under-hood automotive or high-ambient industrial deployments where the LTC3619IDD#TRPBF must sustain full performance without derating.
How does the LTC3619IDD#TRPBF enforce its programmable input current limit?
The LTC3619IDD#TRPBF continuously sums scaled representations of both channel inductor currents at the RLIM pin. When the integrated current reaches the internal 1V threshold, Channel 2's top PFET on-time is shortened to reduce input draw, while Channel 1 remains fully regulated. The LTC3619IDD#TRPBF achieves ±5% limit accuracy across temperature via matched PFET sense ratios trimmed to 2%, ensuring reliable USB 500mA compliance without external current-sense amplifiers.
Can the LTC3619IDD#TRPBF operate with 100% duty cycle, and what limits its dropout performance?
Yes, the LTC3619IDD#TRPBF supports true 100% duty cycle operation, maintaining regulation as VIN approaches VOUT. Dropout performance is limited by the RDS(ON) of its internal P-channel MOSFET - which increases at lower VIN - and inductor DCR. For example, at 125°C and VIN = 2.7V, the typical PFET RDS(ON) rises to ~0.5Ω (Channel 1), so the LTC3619IDD#TRPBF's minimum sustainable output voltage equals VOUT = VIN − (IOUT × RDS(ON)). Thermal design must account for this dissipation.
What is the purpose of the CLIM capacitor on the RLIM pin of the LTC3619IDD#TRPBF?
The CLIM capacitor on the RLIM pin integrates the summed current-sense signal to smooth transient spikes and set the response time of the input current limit. With RLIM = 116kΩ and CLIM = 2.2nF, the LTC3619IDD#TRPBF delays limit activation by ~92µs - allowing full 2A GSM transmit pulses to pass before intervention. Selecting CLIM too small risks false limiting during normal switching; too large causes unacceptable delay in fault response. The LTC3619IDD#TRPBF remains stable for any CLIM >100pF.
Does the LTC3619IDD#TRPBF support independent voltage setting for each channel?
Yes, the LTC3619IDD#TRPBF provides fully independent feedback paths via VFB1 and VFB2 pins, each referenced to the same 0.6V internal基准. By using separate resistor dividers, Channel 1 can be set to 1.2V while Channel 2 is set to 3.3V - or any combination between 0.6V and 5V. The LTC3619IDD#TRPBF maintains ±2% output accuracy for both channels simultaneously, with no cross-regulation penalty, enabling mixed-voltage SoC or FPGA power schemes.
LTC3619IDD#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-WFDFN 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-DFN (3x3)
LTC3619IDD#TRPBF FAQ
1.How can I place an order for LTC3619IDD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3619IDD#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 LTC3619IDD#TRPBF reliable?
The price and inventory of LTC3619IDD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3619IDD#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3619IDD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3619IDD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3619IDD#TRPBF?
LTC3619IDD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3619IDD#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 LTC3619IDD#TRPBF?
For technical support, including LTC3619IDD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3619IDD#TRPBF requirements.
6.How does Aetrix verify that LTC3619IDD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3619IDD#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 LTC3619IDD#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3619IDD#TRPBF?
All LTC3619IDD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3619IDD#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 LTC3619IDD#TRPBF part is unused and in its original packaging.
Return procedure for LTC3619IDD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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