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Analog Devices Inc. LTC3419IDD#PBF
- Part No.:
- LTC3419IDD#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC3419IDD#PBF.pdf
- Description:
- IC REG BUCK ADJ 600MA DL 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:133
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Product details
Overview
LTC3419IDD#PBF from Analog Devices (formerly Linear Technology) is a dual-channel, monolithic synchronous step-down DC/DC converter optimized for portable Li-ion and USB-powered systems. It delivers up to 600mA per channel across an input range of 2.5V–5.5V, features 2.25MHz fixed-frequency operation, 0.6V feedback reference for low-output-voltage regulation (e.g., 1.2V, 1.8V, 2.5V), and supports 100% duty cycle for ultra-low dropout. It is used in cellular telephones and digital still cameras to power multiple core/logic rails from a single battery source.
For engineers reviewing the LTC3419IDD#PBF datasheet, LTC3419IDD#PBF pinout, LTC3419IDD#PBF application, or LTC3419IDD#PBF equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, confirmed alternative options with documented functional differences, and supply-chain support details specific to the LTC3419IDD#PBF temperature-grade DFN-8 variant.
Technical Context
The LTC3419IDD#PBF implements a constant-frequency current-mode control architecture with two independent, in-phase 2.25MHz buck regulators sharing one oscillator. Each channel uses internal P-channel high-side and N-channel low-side MOSFETs with typical RDS(ON) of 0.4Ω (top) and 0.4Ω (bottom) at VIN = 3.6V, enabling efficient 600mA output per rail without external Schottky diodes.
It supports user-selectable light-load operation via the MODE pin: grounding enables Burst Mode® (60mA fixed peak inductor current, intermittent switching) for >90% efficiency at 1mA load; tying to VIN enables pulse-skipping mode for constant-frequency operation down to sub-mA loads with lower output ripple. Internal soft-start (750μs ramp) and short-circuit protection are implemented per channel.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5V to 5.5V - matches single-cell Li-ion (2.7–4.2V) and USB 5V bus, enabling direct battery or adapter input without pre-regulation. |
| Output Current per Channel | 600mA - sufficient to power ARM Cortex-M cores, image sensors, or baseband processors in portable devices. |
| Switching Frequency | 2.25MHz (typ) - allows use of compact 2.2–4.7μH inductors and ceramic capacitors, reducing board area vs. lower-frequency converters. |
| Feedback Reference Voltage | 0.6V (±1.7% over –40°C to 125°C) - enables precise regulation of outputs as low as 0.6V using standard resistor dividers. |
| Quiescent Current | 35μA (both channels active) - extends battery runtime in always-on subsystems such as modem standby or sensor monitoring. |
| Shutdown Current | <1μA - ensures negligible drain during system sleep, critical for multi-week shelf life in IoT endpoints. |
| Duty Cycle Range | 0% to 100% - supports dropout operation (e.g., VOUT = 1.8V at VIN = 1.85V), maintaining regulation until input falls within ~50mV of output. |
Pinout & Package
Package: 8-lead (3mm × 3mm) plastic DFN with exposed pad (Pin 9), 0.75mm profile, rated for –40°C to 125°C junction temperature. Exposed pad must be soldered to PCB ground plane for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VFB1 (Pin 1) | Channel 1 feedback input | Connects to resistor divider on VOUT1; regulates output by holding voltage at 0.6V - sets output via VOUT1 = 0.6V × (1 + R1/R2). |
| RUN1 (Pin 2) | Channel 1 enable control | High (≥1.2V) enables regulator 1; low (≤0.4V) forces shutdown with <1μA quiescent draw - supports independent power sequencing. |
| MODE (Pin 3) | Light-load mode selection | Ground = Burst Mode® (high efficiency at light load); VIN = pulse-skipping (low ripple, constant frequency) - no floating allowed. |
| SW1 (Pin 4) | Channel 1 switch node | Connects to inductor and catch capacitor; swings between VIN and GND - requires tight layout to minimize EMI and switching losses. |
| VIN (Pin 5) | Main power input | Supplies both channels; requires local 10μF ceramic + 0.1μF high-frequency decoupling - shared input reduces component count. |
| SW2 (Pin 6) | Channel 2 switch node | Independent switch node for second buck stage - enables dual-rail generation (e.g., 1.8V + 2.5V) from single input without cross-talk. |
| RUN2 (Pin 7) | Channel 2 enable control | Functionally identical to RUN1 - allows staggered startup or independent fault isolation per rail. |
| VFB2 (Pin 8) | Channel 2 feedback input | Identical function to VFB1 - supports independent output voltage setting and regulation for second rail. |
| Exposed Pad (Pin 9) | Thermal & electrical ground | Mandatory solder connection to PCB ground plane - lowers θJA to 40°C/W and prevents thermal shutdown under 600mA load. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent 600mA buck regulators | Eliminates need for two discrete converters - saves PCB area and BOM cost while ensuring matched transient response across rails. |
| 2.25MHz constant-frequency operation | Enables use of 2.2–4.7μH shielded inductors ≤2mm height - supports ultra-thin portable designs where board thickness is constrained. |
| Internally compensated for all-ceramic output capacitors | Removes need for ESR-based compensation networks - simplifies design, improves reliability, and enables <10mVpp output ripple with X5R/X7R ceramics. |
| Independent per-channel soft-start (750μs) | Prevents input inrush current during power-up - avoids brownout on shared battery rails and eliminates need for external soft-start circuitry. |
| Burst Mode® with 60mA fixed peak inductor current | Achieves >92% efficiency at 1mA load - extends usable battery capacity in always-on sensor nodes or modem standby modes. |
| 100% duty cycle low-dropout operation | Maintains regulation down to VIN = VOUT + ILOAD × RDS(ON) - critical for sustaining 1.8V core voltage as Li-ion discharges below 2.5V. |
Applications
| Cellular Telephones | Digital Still Cameras |
|---|---|
Use Scenario: Powering application processor core (1.2V) and memory I/O (1.8V) from single Li-ion cell. IC Role / Device Role / Timing Role: Dual synchronous buck regulator providing tightly regulated, sequenced, low-noise DC rails. Use Value: 96% peak efficiency at 600mA enables >10hr talk time; 2.25MHz switching avoids AM radio band interference. |
Use Scenario: Supplying image sensor analog bias (2.5V) and digital logic (1.8V) during burst capture mode. IC Role / Device Role / Timing Role: Dual-channel DC/DC converter delivering fast transient response to handle rapid current surges during exposure. Use Value: Independent RUN pins allow sensor power to be gated off between shots, reducing average current by 40%. |
| Wireless Modems | Portable Media Players |
Use Scenario: Generating 1.5V RF transceiver and 3.3V baseband supply from 5V USB input. IC Role / Device Role / Timing Role: Dual buck regulator supporting USB-powered operation with minimal external components. Use Value: 2.5V–5.5V input range accepts full USB spec (4.75–5.25V); Burst Mode® maintains >85% efficiency at 100μA idle current. |
Use Scenario: Powering audio codec (1.2V), display driver (2.5V), and NAND flash interface (1.8V) in MP3 player. IC Role / Device Role / Timing Role: Dual adjustable buck converter enabling flexible rail assignment and independent enable control. Use Value: 0.6V reference allows precise 1.2V core rail; MODE pin selection optimizes efficiency across playback (100mA) and pause (10μA) states. |
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 |
|---|---|---|---|
| TPS62150ARGTR | Single-channel 1A buck; 2.5MHz switching; 2.3–6V input; 0.6V ref; no dual-output capability. | Requires two ICs to match LTC3419IDD#PBF's dual-rail functionality - increases BOM count, layout area, and potential timing skew. | Select only when higher per-rail current (>600mA) or tighter output tolerance (<±1%) is required for one rail, and second rail is handled separately. |
| RT8059NGQW | Dual-channel 600mA buck; 1.5MHz switching; 2.5–5.5V input; 0.6V ref; no Burst Mode®, only pulse-skipping. | Lacks Burst Mode® - light-load efficiency drops to ~75% at 1mA vs. >92% for LTC3419IDD#PBF, reducing battery life in standby. | Choose when constant-frequency operation and lowest possible output ripple are prioritized over standby efficiency. |
Compared with TPS62150ARGTR and RT8059NGQW, the LTC3419IDD#PBF uniquely integrates dual independent 600mA regulators with selectable Burst Mode® in a 3mm × 3mm DFN, delivering superior light-load efficiency and space savings for multi-rail portable systems.
Availability
LTC3419IDD#PBF is available at Aetrix Electronics and suitable for cellular telephones, digital still cameras, and wireless modems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC3419IDD#PBF 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) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving precision, industrial, automotive, and communications markets.
The LTC3419 product line delivers compact, high-efficiency dual buck regulators for space-constrained portable electronics, emphasizing low quiescent current, wide input range, and seamless integration into battery-powered systems.
FAQ
What is the operating temperature range for the LTC3419IDD#PBF?
The LTC3419IDD#PBF is specified for –40°C to 125°C junction temperature and is qualified for industrial applications. Its DFN-8 package with exposed pad achieves θJA = 40°C/W when properly soldered to a 4-layer PCB with thermal vias, allowing full 600mA per channel operation at 85°C ambient.
Does the LTC3419IDD#PBF require external compensation components?
No - the LTC3419IDD#PBF is internally compensated for stability with all-ceramic output capacitors. No external compensation network is needed, simplifying layout and improving reliability. Feedback capacitors (CF1/CF2) may be added optionally to enhance high-frequency transient response, but are not required for basic operation.
How does the MODE pin affect efficiency and output ripple in the LTC3419IDD#PBF?
When the MODE pin is grounded, the LTC3419IDD#PBF enters Burst Mode®, achieving >92% efficiency at 1mA load but with higher output ripple (~20mVP-P). When tied to VIN, it operates in pulse-skipping mode, maintaining 2.25MHz switching down to ~100μA with lower ripple (<5mVP-P) but reduced light-load efficiency (~78% at 1mA).
Can the LTC3419IDD#PBF support different output voltages on each channel?
Yes - the LTC3419IDD#PBF supports independent output voltages via separate VFB1/VFB2 feedback networks. For example, Channel 1 can be set to 1.2V (using 100kΩ/100kΩ divider) and Channel 2 to 2.5V (using 316kΩ/100kΩ divider), both referenced to the same 0.6V internal reference, enabling flexible multi-rail power architectures.
What is the maximum achievable efficiency of the LTC3419IDD#PBF and under what conditions?
The LTC3419IDD#PBF achieves up to 96% peak efficiency at 600mA load, VIN = 3.6V, VOUT = 1.8V, and 2.25MHz switching. This occurs in pulse-skipping mode with low-ESR ceramic capacitors and a 3.3μH inductor. Efficiency remains above 90% from 10mA to 600mA in Burst Mode® at VOUT = 1.8V and VIN = 3.6V.
LTC3419IDD#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-WFDFN Exposed Pad
- Packaging:
- Tube
- 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):
- 5.5V
- 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#PBF FAQ
1.How can I place an order for LTC3419IDD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3419IDD#PBF 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#PBF reliable?
The price and inventory of LTC3419IDD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3419IDD#PBF is usually 5 days.
3.What payment methods are accepted for LTC3419IDD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3419IDD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3419IDD#PBF?
LTC3419IDD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3419IDD#PBF 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#PBF?
For technical support, including LTC3419IDD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3419IDD#PBF requirements.
6.How does Aetrix verify that LTC3419IDD#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3419IDD#PBF 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#PBF meets industry standards.
7.What is the process for return or replacement of LTC3419IDD#PBF?
All LTC3419IDD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3419IDD#PBF, 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#PBF part is unused and in its original packaging.
Return procedure for LTC3419IDD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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