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Analog Devices Inc. LTC3619EMSE#TRPBF
- Part No.:
- LTC3619EMSE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3619EMSE#TRPBF.pdf
- Description:
- IC REG BUCK ADJ DL 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,301
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Product details
Overview
LTC3619EMSE#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 LTC3619EMSE#TRPBF datasheet, LTC3619EMSE#TRPBF pinout, LTC3619EMSE#TRPBF application, or LTC3619EMSE#TRPBF equivalent, key selection considerations include its dual-channel independent soft-start, per-channel power-good monitoring, input current limit arbitration logic (Channel 2 limited while Channel 1 remains regulated), and thermally enhanced 10-lead MSOP package with exposed GND pad.
Technical Context
The LTC3619EMSE#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 trimmed 0.6V internal reference with ±2% output voltage accuracy.
Input current limiting is implemented via external RLIM resistor and CLIM capacitor, enabling precise average input current control (e.g., 475mA typical with 116kΩ). When total input current exceeds the limit, only Channel 2's peak inductor current is reduced-preserving Channel 1 regulation-while both channels retain independent burst-mode operation (50µA IQ) and short-circuit protection.
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 from one IC. |
| Switching Frequency | 2.25MHz (typ) - allows use of compact 1µH–3.3µH surface-mount inductors and reduces EMI fundamental frequency. |
| Feedback Reference | 0.6V ±2% - enables precise low-voltage outputs (e.g., 1.2V, 1.8V) with standard resistor dividers and minimizes divider current error. |
| Input Current Limit Accuracy | ±5% - ensures reliable compliance with USB 2.0 500mA or USB 3.0 900mA source limits under varying temperature and VIN. |
| Quiescent Current (Burst Mode) | 50µA - extends battery runtime in standby modes while maintaining fast wake-up response. |
| Shutdown Current | ≤1µA - eliminates parasitic drain during system sleep or storage. |
Pinout & Package
Package: 10-Lead Plastic MSOP with exposed thermal pad (Pin 11 = GND), θJA = 45°C/W, rated for –40°C to +85°C junction temperature.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VFB1 (Pin 1) | Channel 1 Feedback Input | Connects to resistive divider at Ch1 output; regulates VOUT1 to 0.6V reference with ±2% accuracy. |
| RUN1 (Pin 2) | Channel 1 Enable Control | Logic-high (>1.2V) enables Ch1; logic-low (<0.4V) forces shutdown with ≤1µA quiescent draw. |
| RLIM (Pin 3) | Average Input Current Limit Set | External resistor-to-GND programs input current limit (e.g., 116kΩ = 475mA); capacitor filters transient sensing. |
| PGOOD1 (Pin 4) | Channel 1 Power-Good Indicator | Open-drain output asserts low when VFB1 is within ±5% of 0.6V; blanked for 90µs during startup. |
| SW1 (Pin 5) | Channel 1 Switch Node | Connects to inductor; swings between VIN and GND; requires low-ESR ceramic output capacitor for stability. |
| 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 Ch2; supports separate inductor and output filter for noise isolation. |
| PGOOD2 (Pin 8) | Channel 2 Power-Good Indicator | Independent open-drain status signal for Ch2; enables sequencing or fault reporting without cross-talk. |
| RUN2 (Pin 9) | Channel 2 Enable Control | Independent enable/disable control for Ch2; allows staggered startup or dynamic power partitioning. |
| VFB2 (Pin 10) | Channel 2 Feedback Input | Identical function to VFB1 but for Ch2; supports different output voltages (e.g., 1.8V + 3.3V) simultaneously. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable Average Input Current Limit | Set via single RLIM resistor (e.g., 116kΩ → 475mA) with ±5% accuracy over –40°C to 85°C - critical for USB-compliant designs. |
| Dual Independent Soft-Start | Each channel ramps VOUT from 0V to target in ~950µs - prevents inrush into large output capacitors and avoids input supply collapse. |
| Burst Mode® Operation | Reduces IQ to 50µA at light loads while maintaining <25mVP-P output ripple - extends battery life without sacrificing transient response. |
| 100% Duty Cycle Low-Dropout Mode | Enables VOUT ≈ VIN − IOUT × RDS(ON)PFET - sustains regulation down to input voltages within ~100mV of output (e.g., 3.4V out @ 5V in). |
| Per-Channel Power-Good Monitoring | Two independent open-drain PGOOD outputs with ±5% window and 90µs blanking - enables robust power sequencing and fault detection. |
Applications
| USB-Powered Portable Devices | RF Transmitter Power Management |
|---|---|
Use Scenario: Powering baseband processor (1.8V/400mA) and RF front-end (3.3V/800mA) from a single USB 5V supply. IC Role / Device Role / Timing Role: Dual-output buck regulator providing independent, sequenced, and current-limited DC/DC conversion. Use Value: Enforces strict 475mA average input current limit to comply with USB 2.0 specifications while delivering full peak load currents via output capacitance hold-up. | Use Scenario: Supplying GSM pulse-load transmitters requiring high peak current (2A bursts) with stable 3.4V rail. IC Role / Device Role / Timing Role: High-efficiency synchronous buck delivering regulated 3.4V/800mA with fast transient recovery and input current limiting. Use Value: Maintains input voltage stability during 1ms GSM pulses by limiting average input current to 475mA while sourcing >2A peak from local output capacitance. |
| Supercapacitor Charging Systems | Multi-Rail Embedded Controllers |
Use Scenario: Charging a 2.2F supercapacitor bank from 5V USB while powering auxiliary logic. IC Role / Device Role / Timing Role: Dual-channel regulator where Channel 2 supplies charging current and Channel 1 powers system logic. Use Value: Prevents USB port overcurrent trip by limiting total input current to 475mA, while allowing supercapacitor to absorb high charge current via controlled duty cycling. | Use Scenario: Powering ARM Cortex-M7 MCU (1.2V/400mA) and DDR3 memory interface (1.5V/800mA) from 5V input. IC Role / Device Role / Timing Role: Dual synchronous buck with independent enable and soft-start for safe power-up sequencing. Use Value: Enables staggered startup (RUN1 before RUN2) and independent fault reporting (PGOOD1/PGOOD2) to meet JEDEC power sequencing requirements. |
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 |
|---|---|---|---|
| TPS65023RSBR | Triple-output (3x buck), fixed 1.2V/1.5V/1.8V outputs; no programmable input current limit; 2.25MHz switching. | Fixed-output configuration lacks flexibility for custom voltage combinations; no RLIM-based current limiting for USB compliance. | Select when fixed-rail, triple-output power tree is required and USB input current limiting is not needed. |
| MAX16922ATG+T | Dual buck with integrated watchdog and SPI interface; 2.2MHz switching; supports automotive AEC-Q100 Grade 2 (–40°C to +105°C). | Includes safety features (watchdog, fault reporting) and extended temp range; higher BOM cost and design complexity. | Select for automotive infotainment or ADAS systems requiring functional safety support and wider temperature operation. |
Compared with TPS65023RSBR and MAX16922ATG+T, the LTC3619EMSE#TRPBF uniquely combines programmable average input current limiting, independent dual-channel soft-start and power-good signaling, and thermally optimized MSOP packaging-making it optimal for space-constrained, USB-powered portable electronics requiring precise input current control.
Availability
LTC3619EMSE#TRPBF is available at Aetrix Electronics and suitable for USB-powered handheld devices, RF transmitter modules, supercapacitor charging circuits, and multi-rail embedded controllers requiring stable component supply and long-term industrial availability.
Supply support for LTC3619EMSE#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. (including legacy Linear Technology products) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving precision instrumentation, communications, and industrial markets.
The LTC3619 product line delivers dual-channel, high-frequency synchronous buck regulators optimized for compact, low-noise, USB-compliant power delivery in portable and battery-operated systems.
FAQ
What is the maximum output current capability of each channel in the LTC3619EMSE#TRPBF?
The LTC3619EMSE#TRPBF delivers up to 400mA on Channel 1 and 800mA on Channel 2 under typical conditions (VIN = 5V, TA = 25°C, with appropriate PCB layout and thermal management). Peak switch current limits are 800mA (Ch1) and 1600mA (Ch2), supporting high transient loads. Derating applies at elevated temperatures or lower input voltages due to RDS(ON) increase and thermal constraints.
How does the programmable input current limit function in the LTC3619EMSE#TRPBF?
The LTC3619EMSE#TRPBF uses an external resistor (RLIM) from Pin 3 to GND to set the average input current limit. With RLIM = 116kΩ, the limit is 475mA (±5%). When total input current exceeds this value, Channel 2 is current-limited while Channel 1 remains fully regulated. A CLIM capacitor filters sensing transients, allowing design-tailored response time (e.g., 0.1µF for ~7.5ms delay).
Does the LTC3619EMSE#TRPBF support independent power sequencing between its two channels?
Yes, the LTC3619EMSE#TRPBF supports full independent sequencing via separate RUN1 (Pin 2) and RUN2 (Pin 9) enable inputs. Each channel has its own soft-start timer (~950µs ramp time) and dedicated PGOOD1/PGOOD2 outputs. This enables safe, staggered startup-for example, powering a processor core before its I/O rails-and independent fault detection without cross-channel interference.
What package type and thermal characteristics apply to the LTC3619EMSE#TRPBF?
The LTC3619EMSE#TRPBF is packaged in a 10-lead plastic MSOP with exposed thermal pad (Pin 11 = GND). Its thermal resistance is θJA = 45°C/W (JEDEC 2-layer board). The exposed pad must be soldered to a PCB copper pour for effective heat dissipation. Maximum junction temperature is 125°C, with guaranteed operation from –40°C to +85°C ambient.
Can the LTC3619EMSE#TRPBF operate in dropout mode, and what is its minimum input-to-output differential?
Yes, the LTC3619EMSE#TRPBF supports 100% duty cycle operation for low-dropout regulation. Minimum input-to-output differential depends on load and temperature: at 800mA and 25°C, RDS(ON) of the P-channel switch is ~0.27Ω, yielding ~216mV drop (0.27Ω × 0.8A). At lower VIN or higher temperature, RDS(ON) increases-designers must verify worst-case dropout using the Typical Performance Characteristics curves for RDS(ON) vs VIN and temperature.
LTC3619EMSE#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
LTC3619EMSE#TRPBF FAQ
1.How can I place an order for LTC3619EMSE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3619EMSE#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 LTC3619EMSE#TRPBF reliable?
The price and inventory of LTC3619EMSE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3619EMSE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3619EMSE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3619EMSE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3619EMSE#TRPBF?
LTC3619EMSE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3619EMSE#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 LTC3619EMSE#TRPBF?
For technical support, including LTC3619EMSE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3619EMSE#TRPBF requirements.
6.How does Aetrix verify that LTC3619EMSE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3619EMSE#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 LTC3619EMSE#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3619EMSE#TRPBF?
All LTC3619EMSE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3619EMSE#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 LTC3619EMSE#TRPBF part is unused and in its original packaging.
Return procedure for LTC3619EMSE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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