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Analog Devices Inc. LTC3619EDD#TRPBF
- Part No.:
- LTC3619EDD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LTC3619EDD#TRPBF.pdf
- Description:
- IC REG BUCK ADJ DL 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,058
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Product details
Overview
LTC3619EDD#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 100% duty cycle for low-dropout operation-ideal for USB-powered handheld devices and supercapacitor charging.
For engineers reviewing the LTC3619EDD#TRPBF datasheet, LTC3619EDD#TRPBF pinout, LTC3619EDD#TRPBF application, or LTC3619EDD#TRPBF equivalent, key selection considerations include dual-channel independent soft-start, per-channel power-good monitoring, input current limit programming via RLIM resistor, Burst Mode® operation for <25mVP-P ripple at 50µA IQ, and thermal performance in the 3mm × 3mm DFN package with exposed GND pad.
Technical Context
The LTC3619EDD#TRPBF implements two independent current-mode buck regulators sharing a synchronized 2.25MHz clock; each channel uses P-channel high-side and N-channel low-side MOSFETs with RDS(ON) of 0.45Ω/0.35Ω (Ch1) and 0.27Ω/0.25Ω (Ch2) at VIN = 5V. Input current limiting is achieved by summing scaled inductor current signals at the RLIM pin, triggering Ch2 current limiting when total input current exceeds the programmed threshold while Ch1 remains regulated.
Operation includes Burst Mode® for light loads (IQ = 50µA), 100% duty cycle dropout support, ±2% output voltage accuracy over –40°C to 85°C, and short-circuit protection via extended N-FET conduction. Each channel has independent soft-start (≈950µs), power-good monitoring with ±9% window, and shutdown current ≤1µA.
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 RF subsystems in compact portable designs. |
| Switching Frequency | 2.25MHz (typ) - permits use of sub-2.2µH inductors and reduces footprint vs lower-frequency buck converters. |
| Feedback Reference Voltage | 0.6V ±2% - allows precise low-voltage outputs (e.g., 1.2V, 1.8V) with standard resistor dividers and minimal divider current error. |
| Average Input Current Limit Accuracy | ±5% - ensures reliable USB port compliance and prevents host supply collapse during peak load transients. |
| Quiescent Current (Burst Mode) | 50µA - extends battery runtime in always-on sensor or standby modes without sacrificing regulation stability. |
| Package Thermal Resistance (θJA) | 40°C/W - validated for 10-lead 3mm × 3mm DFN with soldered exposed pad, enabling >1W continuous dissipation at TA = 85°C. |
Pinout & Package
Package: 10-lead 3mm × 3mm plastic DFN with exposed GND pad (Pin 11), rated for –40°C to 85°C operating junction temperature.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VFB1 (Pin 1) | Channel 1 feedback input | Connects to resistive divider from Ch1 output; regulates output to 0.6V reference with ±2% accuracy. |
| RUN1 (Pin 2) | Channel 1 enable control | Logic-high (>1.2V) enables Ch1; logic-low (<0.4V) shuts down Ch1 with ≤1µA IQ. |
| RLIM (Pin 3) | Input current limit programming | Resistor-to-GND sets average input current limit (e.g., 116kΩ = 475mA); capacitor filters transient response. |
| PGOOD1 (Pin 4) | Channel 1 power-good indicator | Open-drain output asserts low when VFB1 is within ±9% of 0.6V; blanked for 90µs after startup. |
| SW1 (Pin 5) | Channel 1 switch node | Connects to inductor; swings between VIN and GND; requires low-ESR ceramic output capacitor. |
| VIN (Pin 6) | Main input supply | Accepts 2.5V–5.5V; 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 Ch2; supports separate inductor and output filtering from Ch1. |
| PGOOD2 (Pin 8) | Channel 2 power-good indicator | Open-drain output identical in function to PGOOD1 but for Ch2 output regulation status. |
| RUN2 (Pin 9) | Channel 2 enable control | Independent enable/disable control for Ch2; no cross-talk with RUN1 or other pins. |
| VFB2 (Pin 10) | Channel 2 feedback input | Identical function to VFB1 but for Ch2; supports independent output voltage setting (0.6V–5V). |
| GND (Pin 11) | Power and signal ground | Exposed thermal pad; must be soldered to PCB ground plane for thermal and EMI performance. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent soft-start | ≈950µs ramp per channel - prevents inrush current into large output capacitors without requiring external timing components. |
| Programmable input current limit | 200mA to 500mA range via single RLIM resistor - enables USB 2.0-compliant 500mA sourcing while sustaining high peak output currents. |
| Burst Mode® operation | <25mVP-P output ripple at 50µA IQ - maintains tight regulation during sleep modes without external bias rails or complex control logic. |
| Per-channel power-good monitoring | ±9% window with 90µs blanking - provides reliable system-level power sequencing and fault detection for FPGA, MCU, or RF ICs. |
| 100% duty cycle low-dropout mode | Supports VOUT ≈ VIN − IOUT×RDS(ON) - extends battery runtime in Li-ion systems down to 2.7V while maintaining regulation. |
| Short-circuit protection | Automatic N-FET conduction extension - limits inductor current runaway during output shorts without latch-off or external circuitry. |
Applications
| USB-Powered Portable Devices | RF Transmitter Power Management |
|---|---|
|
Use Scenario: Dual-rail power for Bluetooth/Wi-Fi SoC with 1.8V core and 3.3V I/O/RF sections in space-constrained wearables. IC Role / Device Role / Timing Role: LTC3619EDD#TRPBF delivers regulated 1.8V/3.3V from single 3.7V Li-ion cell with independent enable and power-good signaling. Use Value: Eliminates need for discrete LDOs or second DC/DC stage; 2.25MHz operation enables 1.5µH/3.3µH inductors fitting <5mm² board area. |
Use Scenario: GSM pulse-load power delivery where 2A burst current must be supplied without collapsing 5V USB input. IC Role / Device Role / Timing Role: LTC3619EDD#TRPBF uses programmable input current limit (475mA) and Ch2 priority current limiting to sustain 800mA output during 1ms pulses. Use Value: Prevents host USB port brownout while maintaining stable 3.4V RF supply; Burst Mode® ensures <50µA standby draw between pulses. |
| Supercapacitor Charging Interface | Industrial Sensor Node Power |
|
Use Scenario: Charging 1F/5.5V supercap from 5V USB source while powering 3.3V microcontroller and analog front-end. IC Role / Device Role / Timing Role: LTC3619EDD#TRPBF Ch1 supplies MCU (400mA), Ch2 supplies analog sensors (800mA), with RLIM limiting total input to 500mA. Use Value: Enables safe, controlled supercap charging without violating USB current limits; 0.6V reference allows precise 3.3V/2.5V rail generation. |
Use Scenario: Long-life battery-operated environmental sensor node requiring 1.2V digital core and 2.5V analog ADC reference. IC Role / Device Role / Timing Role: LTC3619EDD#TRPBF operates in Burst Mode® at 50µA IQ, delivering both rails from 3.6V primary cell with 100% duty cycle near end-of-life. Use Value: Extends 10-year battery life by minimizing quiescent loss; ±2% output accuracy ensures ADC reference stability across temperature. |
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; 2.5MHz fixed frequency; 0.6V reference. | Requires two ICs for dual-rail design; lacks RLIM-based USB compliance; higher IQ (12µA active, no Burst Mode). | Select only if single-rail simplicity outweighs dual-output integration and USB current control needs. |
| LTC3619BIDD#TRPBF | Pin-compatible variant with low-noise pulse-skipping mode instead of Burst Mode®; identical specs otherwise. | Better EMI profile for sensitive RF/analog circuits; slightly higher light-load IQ (75µA vs 50µA). | Choose LTC3619BIDD#TRPBF when conducted/radiated noise is critical; same layout and BOM except for performance tuning. |
Compared with TPS62150ARGTR and LTC3619BIDD#TRPBF, the LTC3619EDD#TRPBF uniquely combines dual independent outputs, programmable input current limiting for USB compliance, and ultra-low 50µA Burst Mode® quiescent current-making it optimal for compact, battery-sensitive dual-rail systems where input supply robustness and standby efficiency are co-priorities.
Availability
LTC3619EDD#TRPBF is available at Aetrix Electronics and suitable for USB-powered portable devices, RF transmitter power management, supercapacitor charging interfaces, and industrial sensor node power requiring stable component supply across automotive-grade temperature ranges and long-lifecycle production programs.
Supply support for LTC3619EDD#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, emphasizing high-efficiency, low-noise, and thermally robust DC/DC solutions for demanding industrial and portable applications.
The LTC3619EDD#TRPBF belongs to Linear's monolithic synchronous buck regulator product line, designed specifically for space-constrained, battery-powered systems requiring dual independent outputs, USB-compliant input current control, and nanoscale quiescent power in thermally enhanced DFN packages.
FAQ
What is the maximum output current capability of each channel in the LTC3619EDD#TRPBF?
The LTC3619EDD#TRPBF delivers up to 400mA on Channel 1 and 800mA on Channel 2 under typical conditions (TA = 25°C, VIN = 5V). These values are validated across the full –40°C to 85°C operating junction temperature range with appropriate PCB thermal design, including soldering the exposed GND pad to minimize θJA (40°C/W).
How does the programmable input current limit function in the LTC3619EDD#TRPBF?
The LTC3619EDD#TRPBF uses the RLIM pin to set an average input current limit via an external resistor (e.g., 116kΩ = 475mA). When the summed input current from both channels exceeds this limit, Channel 2 enters current limiting while Channel 1 remains fully regulated-enabling USB 2.0 compliance without sacrificing core rail stability.
Does the LTC3619EDD#TRPBF support 100% duty cycle operation, and what is its significance?
Yes, the LTC3619EDD#TRPBF supports 100% duty cycle operation, allowing VOUT to track VIN minus IOUT×RDS(ON). This low-dropout capability extends usable battery life in Li-ion systems by maintaining regulation down to ~2.7V input, critical for handheld devices operating near end-of-discharge.
What is the purpose of the exposed pad (Pin 11) on the LTC3619EDD#TRPBF DFN package?
The exposed pad (Pin 11) on the LTC3619EDD#TRPBF is electrically and thermally connected to GND. It must be soldered to the PCB ground plane to achieve the specified θJA of 40°C/W and ensure reliable thermal performance at full load-omitting this connection risks thermal shutdown or reduced lifetime.
Can the LTC3619EDD#TRPBF operate with output voltages below 1V?
Yes, the LTC3619EDD#TRPBF supports output voltages from 0.6V to 5V using external resistor dividers. Its 0.6V feedback reference enables precise low-voltage rails such as 0.8V or 0.9V for modern ultra-low-power MCUs, provided the divider resistors are selected to maintain ±2% accuracy and minimize current-induced errors.
LTC3619EDD#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)
LTC3619EDD#TRPBF FAQ
1.How can I place an order for LTC3619EDD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3619EDD#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 LTC3619EDD#TRPBF reliable?
The price and inventory of LTC3619EDD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3619EDD#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3619EDD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3619EDD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3619EDD#TRPBF?
LTC3619EDD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3619EDD#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 LTC3619EDD#TRPBF?
For technical support, including LTC3619EDD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3619EDD#TRPBF requirements.
6.How does Aetrix verify that LTC3619EDD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3619EDD#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 LTC3619EDD#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3619EDD#TRPBF?
All LTC3619EDD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3619EDD#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 LTC3619EDD#TRPBF part is unused and in its original packaging.
Return procedure for LTC3619EDD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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