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Analog Devices Inc. LTC3419EDD-1#PBF
- Part No.:
- LTC3419EDD-1#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC3419EDD-1#PBF.pdf
- Description:
- IC REG BUCK 1.575V/1.8V DL 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,871
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Product details
Overview
LTC3419EDD-1#PBF from Analog Devices (formerly Linear Technology) is a dual-channel, monolithic synchronous step-down DC/DC regulator in a 3mm × 3mm DFN-8 package. It delivers up to 600mA per channel with 2.25MHz fixed-frequency operation, 0.6V feedback reference, and 100% duty cycle low-dropout capability - enabling efficient Li-ion and USB-powered portable systems such as digital still cameras and wireless modems.
For engineers reviewing the LTC3419EDD-1#PBF datasheet, LTC3419EDD-1#PBF pinout, LTC3419EDD-1#PBF application, or LTC3419EDD-1#PBF equivalent, key selection criteria include its dual-output current-mode architecture, Burst Mode® vs pulse-skipping mode selectability, internal compensation for ceramic capacitors, and fixed 1.575V/1.8V output configuration eliminating external resistors.
Technical Context
The LTC3419EDD-1#PBF implements two independent current-mode buck regulators sharing a synchronized 2.25MHz clock. Each channel features internal soft-start, short-circuit protection, and separate RUN enable inputs - allowing staggered startup and independent power sequencing.
Its fixed-output variant uses internal resistor dividers to set VOUT1 = 1.575V and VOUT2 = 1.8V, with regulated feedback voltages of 0.6V per channel. The MODE pin selects between Burst Mode® (for ultra-low quiescent current <1μA shutdown, 35μA active) and pulse-skipping mode (for constant-frequency, low-ripple operation).
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 regulation. |
| Output Configuration | Fixed: 1.575V @ CH1, 1.8V @ CH2 - eliminates external feedback resistors and layout sensitivity. |
| Max Output Current | 600mA per channel - sufficient for core logic, memory, and I/O rails in portable media players and PDAs. |
| Switching Frequency | 2.25MHz (±25%) - enables use of sub-3.3μH inductors and compact 10μF ceramic output capacitors. |
| Quiescent Current | 35μA (both channels active) - extends battery runtime in always-on subsystems like modem standby. |
| Feedback Reference | 0.6V ±1.7% - enables stable regulation down to 0.6V output or higher via external divider (not used in -1 variant). |
| Shutdown Current | <1μA - meets stringent leakage requirements for battery-backed real-time clocks or sensor wake logic. |
Pinout & Package
Package: 8-lead (3mm × 3mm) plastic DFN with exposed pad (Pin 9), 0.75mm profile, RoHS-compliant lead-free finish (PBF). Thermal performance requires soldering exposed pad to PCB ground plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VFB1 (Pin 1) | Channel 1 feedback input | Internally connected to 1.575V output divider; must be tied directly to VOUT1 in -1 variant. |
| RUN1 (Pin 2) | Channel 1 enable control | High = enable (≥1.2V); low = shutdown (<0.4V); 1μA leakage allows simple pull-up/pull-down. |
| MODE (Pin 3) | Operating mode select | GND = Burst Mode®; VIN = pulse-skipping; floating prohibited - determines light-load efficiency vs ripple tradeoff. |
| SW1 (Pin 4) | Channel 1 switch node | Connects to inductor; swings from GND to VIN; requires low-inductance layout to minimize EMI. |
| VIN (Pin 5) | Main power input | 2.5–5.5V supply; must be decoupled with ≥1μF ceramic + 0.1μF high-frequency cap near pin. |
| SW2 (Pin 6) | Channel 2 switch node | Independent from SW1; identical routing requirements; enables dual-output power tree isolation. |
| RUN2 (Pin 7) | Channel 2 enable control | Functionally identical to RUN1; supports independent sequencing of 1.575V and 1.8V rails. |
| VFB2 (Pin 8) | Channel 2 feedback input | Internally connected to 1.8V output divider; must be tied directly to VOUT2 in -1 variant. |
| Exposed Pad (Pin 9) | Thermal & electrical ground | Must be soldered to PCB ground plane; primary thermal path - critical for 125°C junction limit compliance. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent regulators | Separate RUN pins and soft-start timers allow staggered power-up of 1.575V and 1.8V rails - prevents inrush current stacking. |
| Internal compensation | Works with all-ceramic output capacitors (≥10μF) - eliminates ESR dependency and simplifies BOM for space-constrained designs. |
| Burst Mode® operation | 35μA quiescent current at light load with <20mVP-P output ripple - ideal for battery-powered sleep states. |
| 100% duty cycle dropout | Maintains regulation down to VIN – VOUT ≈ 100mV at 600mA - extends usable battery voltage range in Li-ion applications. |
| Short-circuit protection | Forces N-MOS on longer per cycle during overload - reduces switching frequency and limits peak inductor current without latch-off. |
Applications
| Mobile Baseband Power | Digital Camera Core Supply |
|---|---|
Use Scenario: Powering baseband processor cores requiring tightly regulated 1.575V and 1.8V rails from a shared Li-ion battery. IC Role / Device Role / Timing Role: Dual synchronous buck regulator delivering independent, sequenced, low-noise DC supplies with fast transient response. Use Value: Eliminates need for two discrete converters; 2.25MHz switching avoids AM radio band interference while enabling tiny 2.2μH inductors. | Use Scenario: Supplying image sensor analog front-end (1.575V) and digital signal processor I/O (1.8V) in compact digital still cameras. IC Role / Device Role / Timing Role: Fixed-output dual buck IC providing precise, low-ripple voltage rails with independent enable control for power gating. Use Value: Internal 0.6V reference and fixed dividers ensure ±1.7% output accuracy over temperature - critical for sensor ADC reference stability. |
| Wireless Modem RF/Logic Partition | Portable Media Player SoC Rails |
Use Scenario: Generating clean 1.575V for RF transceiver LDO input and 1.8V for baseband logic in DSL/wireless modems. IC Role / Device Role / Timing Role: Dual-channel DC/DC converter with Burst Mode® for low-power idle states and pulse-skipping for active data transmission. Use Value: <1μA shutdown current preserves battery during extended idle; 35μA active IQ minimizes standby drain without sacrificing regulation. | Use Scenario: Powering application SoC core (1.575V) and memory interface (1.8V) in portable media players with USB charging. IC Role / Device Role / Timing Role: Compact dual buck regulator supporting 2.5–5.5V input range - accepts both battery and USB 5V without external pre-regulation. Use Value: 100% duty cycle operation maintains regulation until battery drops to ~1.7V - maximizes usable capacity from single-cell Li-ion. |
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 600mA buck; 2.25MHz; adjustable output only; no dual outputs. | Requires two ICs to match LTC3419EDD-1#PBF's dual-rail capability - increases board area and BOM count. | Select only if system requires independent optimization of each rail's feedback network or timing. |
| MAX17503ATP+T | Dual-channel, but 4.5–40V input; 1A per channel; larger 5mm × 5mm TQFN; no Burst Mode®. | Over-specified for portable Li-ion/USB use; higher IQ (120μA) and larger footprint reduce battery life and density. | Prefer for industrial/high-voltage applications where LTC3419EDD-1#PBF's 5.5V max input is insufficient. |
Compared with TPS62150ARGTR and MAX17503ATP+T, the LTC3419EDD-1#PBF uniquely integrates dual fixed outputs (1.575V/1.8V), Burst Mode® for sub-μA shutdown, and 3mm × 3mm DFN packaging - making it optimal for space- and battery-constrained portable electronics where rail count, size, and quiescent power are critical.
Availability
LTC3419EDD-1#PBF is available at Aetrix Electronics and suitable for mobile baseband power, digital camera core supply, wireless modem RF/logic partition, and portable media player SoC rails requiring stable component supply across production lifecycles.
Supply support for LTC3419EDD-1#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 highly integrated, high-frequency dual buck regulators targeting portable electronics with strict size, efficiency, and multi-rail requirements - emphasizing low IQ, small inductors, and seamless Li-ion/USB compatibility.
FAQ
What output voltages does the LTC3419EDD-1#PBF provide?
The LTC3419EDD-1#PBF provides fixed output voltages of 1.575V on Channel 1 and 1.8V on Channel 2. These values are set by internal resistor dividers - no external feedback resistors are required. The 0.6V internal reference ensures tight regulation, with typical output accuracy of ±1.7% over temperature and line conditions. This fixed configuration simplifies design for standard logic and sensor rails.
How does the MODE pin affect LTC3419EDD-1#PBF operation?
The MODE pin on the LTC3419EDD-1#PBF selects between Burst Mode® operation (pin grounded) and pulse-skipping mode (pin tied to VIN). In Burst Mode®, the IC achieves ultra-low quiescent current (35μA active, <1μA shutdown) at light loads by intermittently activating switching cycles. In pulse-skipping mode, it maintains constant 2.25MHz frequency down to very low loads - prioritizing low output ripple over efficiency. Floating the MODE pin is prohibited.
Can the LTC3419EDD-1#PBF operate from a single-cell Li-ion battery?
Yes, the LTC3419EDD-1#PBF operates from 2.5V to 5.5V, fully covering the discharge curve of a single-cell Li-ion battery (2.7V–4.2V nominal, down to ~2.5V cutoff). Its 100% duty cycle capability maintains regulation even when input voltage approaches output levels - extending usable battery life. Efficiency remains >85% at 3.6V input and 600mA load for both outputs.
What package type and thermal requirements apply to the LTC3419EDD-1#PBF?
The LTC3419EDD-1#PBF uses an 8-lead 3mm × 3mm plastic DFN package with an exposed thermal pad (Pin 9). That pad must be soldered to a PCB ground plane to achieve θJA = 40°C/W and sustain full 600mA per channel at 125°C junction temperature. Standard reflow profiles for lead-free (PBF) finishes apply; peak temperature must not exceed 260°C.
Is external compensation required for the LTC3419EDD-1#PBF?
No, the LTC3419EDD-1#PBF is internally compensated and designed to work stably with all-ceramic output capacitors (≥10μF, X5R/X7R dielectric). This eliminates external compensation components and simplifies layout. The control loop is optimized for low-ESR ceramics - using tantalum or aluminum electrolytics may cause instability or poor transient response.
LTC3419EDD-1#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:
- 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)
LTC3419EDD-1#PBF FAQ
1.How can I place an order for LTC3419EDD-1#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3419EDD-1#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-1#PBF reliable?
The price and inventory of LTC3419EDD-1#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-1#PBF is usually 5 days.
3.What payment methods are accepted for LTC3419EDD-1#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3419EDD-1#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3419EDD-1#PBF?
LTC3419EDD-1#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3419EDD-1#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-1#PBF?
For technical support, including LTC3419EDD-1#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3419EDD-1#PBF requirements.
6.How does Aetrix verify that LTC3419EDD-1#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3419EDD-1#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-1#PBF meets industry standards.
7.What is the process for return or replacement of LTC3419EDD-1#PBF?
All LTC3419EDD-1#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3419EDD-1#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-1#PBF part is unused and in its original packaging.
Return procedure for LTC3419EDD-1#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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