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Analog Devices Inc. LTC3419IDD-1#TRPBF
- Part No.:
- LTC3419IDD-1#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC3419IDD-1#TRPBF.pdf
- Description:
- IC REG BUCK 1.575V/1.8V DL 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,414
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Product details
Overview
LTC3419IDD-1#TRPBF from Analog Devices (formerly Linear Technology) is a dual-channel, monolithic synchronous step-down DC/DC regulator in a 3mm × 3mm DFN-8 package, delivering up to 600mA per channel with 2.25MHz fixed-frequency operation, 0.6V feedback reference, and 100% duty cycle low-dropout capability. It targets portable Li-ion–powered systems requiring dual regulated rails such as baseband processors and RF transceivers.
For engineers reviewing the LTC3419IDD-1#TRPBF datasheet, LTC3419IDD-1#TRPBF pinout, LTC3419IDD-1#TRPBF application, or LTC3419IDD-1#TRPBF equivalent, key selection criteria include its dual independent enable (RUN1/RUN2), user-selectable Burst Mode® vs pulse-skipping mode via MODE pin, internal compensation for ceramic output capacitors, and fixed-output configuration (1.575V/1.8V) eliminating external feedback resistors.
Technical Context
The LTC3419IDD-1#TRPBF employs current-mode control with shared 2.25MHz oscillator and in-phase switching across both channels. Each regulator uses P-channel high-side and N-channel low-side synchronous MOSFETs with typical RDS(ON) of 0.4Ω (top) and 0.4Ω (bottom) at VIN = 3.6V, enabling high efficiency across 2.5V–5.5V input range.
It integrates independent soft-start (≈750μs ramp), short-circuit protection via extended bottom-switch conduction, and thermal shutdown. The -1 suffix denotes factory-trimmed fixed outputs: Channel 1 delivers 1.575V ±1.5% and Channel 2 delivers 1.8V ±1.5% over –40°C to 125°C, with VFB pins internally connected to respective outputs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5V to 5.5V - supports single-cell Li-ion (2.7–4.2V) and USB 5V bus without level-shifting. |
| Output Voltage (Ch1/Ch2) | 1.575V / 1.8V - factory-trimmed fixed outputs; eliminates external resistor dividers and layout sensitivity. |
| Max Output Current | 600mA per channel - sufficient for powering core logic, memory I/O, or RF front-end ICs in compact devices. |
| Switching Frequency | 2.25MHz (typ) - enables use of ≤4.7μH inductors and 10μF ceramic output capacitors, minimizing board area. |
| Quiescent Current | 35μA (both channels active) - extends battery runtime in always-on subsystems like PMIC backup rails. |
| Shutdown Current | <1μA - ensures negligible drain during deep sleep modes in portable electronics. |
| Feedback Reference | 0.6V - allows generation of sub-1V outputs when used in adjustable configurations (not applicable to -1 variant). |
Pinout & Package
Package: 8-lead 3mm × 3mm plastic DFN (DD package), 0.75mm profile, exposed pad (Pin 9) soldered to PCB ground for thermal management. Pin count and physical layout match LTC3419IDD#TRPBF but with internal resistor dividers pre-configured for 1.575V/1.8V outputs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VFB1 (Pin 1) | Channel 1 feedback input | Internally tied to VOUT1; not externally accessible - confirms fixed 1.575V output without external divider. |
| RUN1 (Pin 2) | Channel 1 enable control | High = enabled (VIN), Low = shutdown; supports independent power sequencing of dual rails. |
| MODE (Pin 3) | Operating mode select | Ground = Burst Mode® (high light-load efficiency), VIN = pulse-skipping (low ripple, constant frequency). |
| SW1 (Pin 4) | Channel 1 switch node | Connects to inductor; swings between VIN and GND; requires low-inductance layout to minimize EMI. |
| VIN (Pin 5) | Main power input | 2.5–5.5V supply; must be decoupled with ≥10μF ceramic + 0.1μF high-frequency capacitor near pin. |
| SW2 (Pin 6) | Channel 2 switch node | Independent from SW1; enables separate inductor placement for optimal thermal and EMI separation. |
| RUN2 (Pin 7) | Channel 2 enable control | Independent enable/disable; allows staggered startup or dynamic rail disabling in multi-voltage systems. |
| VFB2 (Pin 8) | Channel 2 feedback input | Internally tied to VOUT2; confirms fixed 1.8V output - no external components required. |
| Exposed Pad (Pin 9) | Thermal/Ground connection | Must be soldered to solid PCB ground plane; primary thermal path for 800mW max dissipation. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent enable inputs (RUN1/RUN2) | Enables precise power sequencing - e.g., enable VOUT2 (1.8V I/O) before VOUT1 (1.575V core) to meet processor boot requirements. |
| Fixed-output configuration (-1 variant) | Eliminates external feedback resistors and associated layout errors, reducing BOM count and improving production yield. |
| 2.25MHz constant-frequency operation | Permits ultra-compact filter design: 3.3μH inductors and 10μF X5R/X7R ceramics fit within <12 mm² total footprint per channel. |
| Internal compensation for ceramic capacitors | Removes need for ESR-based stabilization - supports low-ESR MLCCs without risk of loop instability or oscillation. |
| Burst Mode® with <20mVP-P ripple | Maintains >85% efficiency down to 100μA load while limiting output voltage deviation during sleep intervals. |
| 100% duty cycle low-dropout operation | Extends usable battery life: maintains regulation until VIN drops to within ~150mV of VOUT2 (1.8V), critical for end-of-discharge Li-ion. |
Applications
| Mobile Baseband Processor Power | RF Transceiver Bias Rails |
|---|---|
Use Scenario: Powering ARM Cortex-A series application processors with split-core/I/O voltage domains in smartphones. IC Role / Device Role / Timing Role: Dual synchronous buck regulator supplying 1.575V core and 1.8V I/O rails with independent RUN control for DVFS sequencing. Use Value: Enables fast, glitch-free voltage transitions during CPU frequency scaling while maintaining <±1.5% output accuracy across temperature. |
Use Scenario: Generating clean, low-noise bias voltages for LTE/Wi-Fi front-end modules in portable hotspots. IC Role / Device Role / Timing Role: Provides isolated 1.8V LNA and 1.575V PA bias rails with Burst Mode® operation during receive standby to minimize idle current. Use Value: Achieves <1μA shutdown current and <20mVP-P ripple in Burst Mode®, preserving signal integrity and battery life. |
| Digital Still Camera Image Sensor | Portable Media Player SoC |
Use Scenario: Supplying dual regulated rails to CMOS image sensors requiring precise analog (1.575V) and digital (1.8V) supplies. IC Role / Device Role / Timing Role: Delivers tightly regulated, low-noise power with independent soft-start to prevent sensor reset glitches during camera wake-up. Use Value: Internal soft-start limits inrush to <1A peak, avoiding brownout of shared battery rail during simultaneous sensor initialization. |
Use Scenario: Powering application SoCs in MP3 players with display backlight and audio codec subsystems. IC Role / Device Role / Timing Role: Supplies 1.575V core and 1.8V peripheral rails; MODE pin configured for pulse-skipping to suppress audible coil whine during audio playback. Use Value: Constant 2.25MHz switching avoids interference with 20Hz–20kHz audio band, eliminating noise coupling into headphone outputs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62125DRCR | Single-channel, 3MHz, 300mA output; no dual-rail integration; requires external feedback resistors for all outputs. | Suitable only when one regulated rail is needed; lacks independent RUN control and fixed-output variants. | Select only if system requires higher frequency (3MHz) and lower current, and can accommodate discrete dual-buck implementation. |
| RTQ2132B-QT | Dual-channel, 2.5MHz, 600mA/channel; supports adjustable or fixed outputs (1.2V/1.8V); AEC-Q200 qualified; larger 3mm × 4mm QFN. | Designed for automotive infotainment; includes spread-spectrum and enhanced EMI features not present in LTC3419IDD-1#TRPBF. | Prefer for automotive-grade designs requiring qualification; avoid for space-constrained consumer portables due to larger footprint. |
Compared with TPS62125DRCR and RTQ2132B-QT, the LTC3419IDD-1#TRPBF uniquely combines factory-trimmed dual fixed outputs (1.575V/1.8V), 3mm × 3mm DFN packaging, and Burst Mode® optimization for sub-mA loads - making it optimal for cost-sensitive, size-constrained portable electronics where dual-rail simplicity and battery longevity are critical.
Availability
LTC3419IDD-1#TRPBF is available at Aetrix Electronics and suitable for mobile baseband power, RF transceiver bias, digital camera sensor supplies, portable media player SoCs, and wireless modem applications requiring stable component supply with guaranteed long-term availability.
Supply support for LTC3419IDD-1#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 full product support, datasheets, and application engineering for the LTC portfolio. Linear's legacy expertise in precision power management remains integral to ADI's high-performance analog roadmap.
The LTC3419 product line was designed specifically for space-constrained, battery-powered portable electronics requiring dual independent DC/DC rails with minimal external components and industry-leading light-load efficiency.
FAQ
What output voltages does the LTC3419IDD-1#TRPBF provide, and are they adjustable?
The LTC3419IDD-1#TRPBF provides factory-trimmed fixed outputs: Channel 1 delivers 1.575V ±1.5% and Channel 2 delivers 1.8V ±1.5% over –40°C to 125°C. These values are set by internal resistor dividers; the VFB1 and VFB2 pins are not externally accessible, so output voltage adjustment is not supported. This differs from the base LTC3419IDD#TRPBF, which requires external resistors for adjustable operation.
How does the MODE pin function on the LTC3419IDD-1#TRPBF, and what are the trade-offs between modes?
On the LTC3419IDD-1#TRPBF, the MODE pin selects between Burst Mode® (grounded) for maximum light-load efficiency or pulse-skipping mode (tied to VIN) for constant-frequency, low-ripple operation. In Burst Mode®, efficiency remains >85% down to 100μA load but introduces ~20mVP-P ripple; pulse-skipping maintains 2.25MHz switching to avoid audible noise but reduces light-load efficiency below 1mA.
What is the thermal performance of the LTC3419IDD-1#TRPBF in its 3mm × 3mm DFN package?
The LTC3419IDD-1#TRPBF has a θJA of 40°C/W when the exposed pad (Pin 9) is properly soldered to a minimum 100mm² PCB ground plane. At 600mA per channel and VIN = 3.6V, worst-case power dissipation is ~800mW, resulting in ~32°C junction-to-ambient rise above ambient. Derating is recommended above 85°C ambient to maintain reliability within the –40°C to 125°C operating range.
Can the LTC3419IDD-1#TRPBF support independent power sequencing of its two outputs?
Yes - the LTC3419IDD-1#TRPBF provides fully independent RUN1 (Pin 2) and RUN2 (Pin 7) inputs, allowing precise control of startup timing and shutdown order. For example, RUN2 can be asserted 100μs before RUN1 to ensure 1.8V I/O rails stabilize before enabling the 1.575V core rail, meeting strict processor boot requirements without external sequencers.
Does the LTC3419IDD-1#TRPBF require external compensation components for stability?
No - the LTC3419IDD-1#TRPBF is internally compensated and optimized for use with ceramic output capacitors (≥10μF, X5R/X7R dielectric). No external compensation network (e.g., RC across feedback divider) is needed. This simplifies layout, reduces component count, and eliminates tuning effort - a key advantage over many competing dual-buck controllers requiring external loop compensation.
LTC3419IDD-1#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Fixed
- Number of Outputs:
- 2
- Voltage - Input (Min):
- 2.5V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 1.575V, 1.8V
- Voltage - Output (Max):
- -
- Current - Output:
- 600mA
- Frequency - Switching:
- 2.25MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-DFN (3x3)
LTC3419IDD-1#TRPBF FAQ
1.How can I place an order for LTC3419IDD-1#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3419IDD-1#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 LTC3419IDD-1#TRPBF reliable?
The price and inventory of LTC3419IDD-1#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3419IDD-1#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3419IDD-1#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3419IDD-1#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3419IDD-1#TRPBF?
LTC3419IDD-1#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3419IDD-1#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 LTC3419IDD-1#TRPBF?
For technical support, including LTC3419IDD-1#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3419IDD-1#TRPBF requirements.
6.How does Aetrix verify that LTC3419IDD-1#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3419IDD-1#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 LTC3419IDD-1#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3419IDD-1#TRPBF?
All LTC3419IDD-1#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3419IDD-1#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 LTC3419IDD-1#TRPBF part is unused and in its original packaging.
Return procedure for LTC3419IDD-1#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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