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Analog Devices Inc. LTC3419EDD#PBF
- Part No.:
- LTC3419EDD#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC3419EDD#PBF.pdf
- Description:
- IC REG BUCK ADJ 600MA DL 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,778
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Product details
Overview
LTC3419EDD#PBF from Analog Devices (formerly Linear Technology) is a dual-channel, monolithic synchronous step-down DC/DC converter in a 3mm × 3mm DFN-8 package. It delivers up to 600mA per channel across an input range of 2.5V–5.5V, features a 0.6V feedback reference for low-output-voltage regulation (e.g., 1.2V, 1.8V, 2.5V), and operates at a fixed 2.25MHz switching frequency-enabling compact designs for Li-ion–powered portable electronics.
For engineers reviewing the LTC3419EDD#PBF datasheet, LTC3419EDD#PBF pinout, LTC3419EDD#PBF application, or LTC3419EDD#PBF equivalent, key selection criteria include its dual independent enable (RUN1/RUN2), user-selectable Burst Mode® vs. pulse-skipping operation, internal compensation for ceramic output capacitors, 100% duty cycle for ultra-low dropout, and guaranteed performance over –40°C to 125°C junction temperature.
Technical Context
The LTC3419EDD#PBF employs a constant-frequency current-mode control architecture with shared 2.25MHz clock and in-phase operation across both channels. Each regulator uses independent error amplifiers comparing VFB1/VFB2 to a 0.6V internal reference, regulating peak inductor current via ITH voltage to maintain output accuracy under line and load transients.
Light-load behavior is configurable: grounding MODE enables Burst Mode® (fixed ~60mA peak inductor current, intermittent switching, <1μA shutdown IQ); tying MODE to VIN selects pulse-skipping mode (variable peak current, constant-frequency down to very low loads). Short-circuit protection forces extended bottom-switch conduction to safely discharge inductors during faults.
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 rails without external LDO pre-regulation. |
| Output Current per Channel | 600mA - sufficient for core logic, memory, and interface ICs in handheld devices without thermal derating at full load. |
| Switching Frequency | 2.25MHz (typ) - enables use of ≤4.7μH inductors and 10μF ceramic output capacitors, minimizing board area. |
| Feedback Reference Voltage | 0.6V ±1.7% - allows precise setting of low output voltages (e.g., 1.2V, 1.8V) using standard resistor ratios; supports fixed-output variants like LTC3419-1. |
| Quiescent Current | 35μA (both channels active) - extends battery runtime in always-on subsystems; drops to <1μA in shutdown. |
| Efficiency Peak | 96% - achieved at moderate loads (e.g., 100–600mA) with 3.6VIN/1.8VOUT, reducing thermal stress and enabling fanless operation. |
| Duty Cycle Range | 0% to 100% - maintains regulation even when VIN approaches VOUT, critical for battery end-of-discharge operation. |
Pinout & Package
Package: 8-lead (3mm × 3mm) plastic DFN with exposed pad (Pin 9 = GND), 0.75mm profile, RoHS-compliant lead-free finish (PBF).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VFB1 (Pin 1) | Channel 1 feedback input | Connects to resistive divider on VOUT1; regulated to 0.6V for accurate output voltage setting. |
| RUN1 (Pin 2) | Channel 1 enable control | High (≥1.2V) enables Reg1; low (≤0.4V) shuts down Reg1 independently of Reg2. |
| MODE (Pin 3) | Operating mode select | Ground = Burst Mode®; VIN = pulse-skipping; floating prohibited-determines light-load efficiency vs. ripple trade-off. |
| 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 | Supplies both regulators; must be decoupled with ≥10μF ceramic + 0.1μF high-frequency cap close to pin. |
| SW2 (Pin 6) | Channel 2 switch node | Independent switch node for Reg2; layout symmetry recommended to balance thermal distribution. |
| RUN2 (Pin 7) | Channel 2 enable control | Functionally identical to RUN1-enables independent power sequencing of dual-rail systems. |
| VFB2 (Pin 8) | Channel 2 feedback input | Regulated to same 0.6V reference as VFB1; supports independent output voltage programming. |
| Exposed Pad (Pin 9) | Thermal/Ground connection | Must be soldered to PCB ground plane for thermal dissipation (θJA = 40°C/W) and noise reduction. |
Key Features
| Feature | Design Value |
|---|---|
| Internally compensated control loop | Works with all-ceramic output capacitors (no ESR dependency), eliminating need for external compensation components and simplifying layout. |
| Independent soft-start per channel | ~750μs ramp time on each RUNx assertion-limits inrush current into output capacitors and prevents input rail droop during power-up. |
| No external Schottky diodes required | Synchronous N-channel MOSFET bottom switch replaces lossy diode, improving efficiency by 5–10% at medium-to-high loads. |
| Short-circuit protected outputs | Auto-recovering protection via extended bottom-switch conduction-prevents inductor saturation and thermal runaway during output faults. |
| Low dropout operation | 100% duty cycle capability maintains regulation down to VIN – VOUT ≈ RDS(ON) × ILOAD, extending usable battery life in portable applications. |
Applications
| Cellular Telephones | Digital Still Cameras |
|---|---|
Use Scenario: Powering baseband processor core (1.2V) and I/O (1.8V) from single Li-ion cell. IC Role / Device Role / Timing Role: Dual-output buck regulator providing independent, sequenced, low-noise DC supplies with fast transient response. Use Value: Eliminates need for two discrete converters; 2.25MHz operation minimizes solution size while maintaining >90% efficiency across battery discharge curve. |
Use Scenario: Supplying image sensor analog bias (2.5V) and digital logic (1.8V) in compact camera modules. IC Role / Device Role / Timing Role: High-efficiency dual regulator delivering stable, low-ripple power with independent enable control for power gating. Use Value: 0.6V reference enables precise 2.5V output; Burst Mode® extends standby time without compromising startup speed. |
| Wireless Modems | Portable Media Players |
Use Scenario: Generating RF front-end (1.8V) and baseband (1.2V) rails in LTE/5G USB dongles. IC Role / Device Role / Timing Role: Compact dual buck supplying noise-sensitive RF and digital sections with independent RUN control for dynamic power management. Use Value: 2.25MHz switching avoids interference with cellular bands; internal compensation ensures stability with small ceramic caps. |
Use Scenario: Powering audio codec (1.8V), NAND flash (2.5V), and display driver (1.2V) in MP3/MP4 players. IC Role / Device Role / Timing Role: Dual synchronous buck delivering high-efficiency, low-EMI power with soft-start to prevent audio pop during playback start. Use Value: 35μA quiescent current maximizes battery life in sleep mode; 100% duty cycle sustains operation until battery reaches 2.5V. |
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 |
|---|---|---|---|
| TPS62130ARGTR | Single-channel 3A buck; no dual-output capability; 2.5V–6V input; 0.6V ref; 2.5MHz switching. | Requires two devices for dual-rail designs; higher per-channel current but larger solution size and cost. | Select when higher per-rail current (>600mA) or tighter output tolerance (<±1%) is required; not suitable for space-constrained dual-rail layouts. |
| MAX17504ATP+T | Dual-channel, but 4.5V–60V input; 0.8V ref; 100kHz–2.2MHz programmable frequency; external compensation. | Targeted at industrial/high-voltage applications; lacks integrated soft-start and Burst Mode® optimization for portable use. | Prefer for wide-input industrial systems where input exceeds 5.5V; avoid for battery-powered designs due to higher IQ and no low-VIN dropout support. |
Compared with TPS62130ARGTR and MAX17504ATP+T, the LTC3419EDD#PBF uniquely combines dual 600mA outputs, 2.5V minimum input, 100% duty cycle, and Burst Mode® in a 3mm × 3mm DFN-making it optimal for miniaturized, battery-sensitive dual-rail portable electronics where board area and light-load efficiency are critical.
Availability
LTC3419EDD#PBF is available at Aetrix Electronics and suitable for cellular telephones, digital still cameras, and wireless modems requiring stable component supply, long-term lifecycle support, and guaranteed RoHS-compliant manufacturing.
Supply support for LTC3419EDD#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, Inc. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving precision instrumentation, communications, and power conversion markets.
The LTC3419EDD#PBF belongs to Linear's µPower synchronous buck regulator product line, designed specifically for space-constrained, battery-operated portable electronics demanding high efficiency across full load range and robust transient performance.
FAQ
What is the maximum output current per channel for the LTC3419EDD#PBF?
The LTC3419EDD#PBF delivers up to 600mA per channel continuously under typical conditions (TJ ≤ 125°C, VIN = 3.6V, VOUT = 1.8V). This rating is validated across the full –40°C to 125°C operating junction temperature range and assumes proper PCB thermal design with the exposed pad soldered to ground.
Does the LTC3419EDD#PBF require external compensation components?
No, the LTC3419EDD#PBF features internally compensated control loops for both channels, enabling stable operation with all-ceramic output capacitors without external compensation networks. This eliminates design complexity and reduces bill-of-materials cost while maintaining phase margin across process and temperature variations.
How does the MODE pin affect efficiency and output ripple in the LTC3419EDD#PBF?
When the MODE pin is grounded, the LTC3419EDD#PBF enters Burst Mode® operation-reducing light-load efficiency by minimizing switching losses but increasing output ripple (typically ~20mVP-P). When tied to VIN, it uses pulse-skipping mode-maintaining constant 2.25MHz operation with lower ripple but reduced light-load efficiency. The choice depends on system priority: battery life (Burst) vs. signal integrity (pulse-skip).
Can the LTC3419EDD#PBF operate with input voltage equal to the output voltage?
Yes, the LTC3419EDD#PBF supports 100% duty cycle operation, allowing it to regulate when VIN equals VOUT (dropout condition). In this mode, the P-channel top switch remains fully on, and output voltage equals VIN minus ILOAD × RDS(ON). This extends usable battery life down to 2.5V input for 1.2V–2.5V outputs.
What is the shutdown quiescent current of the LTC3419EDD#PBF?
The LTC3419EDD#PBF draws less than 1μA total supply current in shutdown (RUN1 = RUN2 = GND, VIN = 5.5V), verified across temperature. This ultralow IQ preserves battery charge in systems requiring long-term storage or deep sleep modes, such as remote sensors or backup power circuits.
LTC3419EDD#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)
LTC3419EDD#PBF FAQ
1.How can I place an order for LTC3419EDD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3419EDD#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 LTC3419EDD#PBF reliable?
The price and inventory of LTC3419EDD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3419EDD#PBF is usually 5 days.
3.What payment methods are accepted for LTC3419EDD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3419EDD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3419EDD#PBF?
LTC3419EDD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3419EDD#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 LTC3419EDD#PBF?
For technical support, including LTC3419EDD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3419EDD#PBF requirements.
6.How does Aetrix verify that LTC3419EDD#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3419EDD#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 LTC3419EDD#PBF meets industry standards.
7.What is the process for return or replacement of LTC3419EDD#PBF?
All LTC3419EDD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3419EDD#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 LTC3419EDD#PBF part is unused and in its original packaging.
Return procedure for LTC3419EDD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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