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Analog Devices Inc. LTC3419IDD#TRPBF
- Part No.:
- LTC3419IDD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC3419IDD#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 600MA DL 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,371
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Product details
Overview
LTC3419IDD#TRPBF 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, and 100% duty cycle low-dropout capability - enabling extended battery life in space-constrained applications such as digital still cameras and wireless modems.
For engineers reviewing the LTC3419IDD#TRPBF datasheet, LTC3419IDD#TRPBF pinout, LTC3419IDD#TRPBF application, or LTC3419IDD#TRPBF equivalent, key selection criteria include dual-output current capability (600mA/channel), ultra-low quiescent current (35μA active, <1μA shutdown), Burst Mode® vs pulse-skipping mode selectability, internal compensation for ceramic output capacitors, and thermal performance in the 3mm × 3mm DFN-8 package with exposed pad.
Technical Context
The LTC3419IDD#TRPBF employs a constant-frequency current-mode control architecture with synchronized dual channels sharing a single 2.25MHz oscillator. Each regulator uses independent 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 operation across wide load and input voltage ranges.
It supports two light-load operating modes: Burst Mode® (MODE pin grounded) for peak efficiency down to μA loads, and pulse-skipping mode (MODE pin tied to VIN) for constant-frequency, low-ripple operation. Internal soft-start (≈750μs ramp time) and short-circuit protection with frequency reduction during fault conditions are implemented per channel.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5V to 5.5V - compatible with single-cell Li-ion (2.7–4.2V) and USB 5V rails without external regulation. |
| Output Current per Channel | 600mA - sufficient to power core logic, memory, and I/O rails in portable electronics. |
| Switching Frequency | 2.25MHz (typ) - enables use of compact 2.2–4.7μH inductors and low-profile ceramic capacitors. |
| Feedback Reference Voltage | 0.6V (±1.7% over –40°C to 125°C) - supports precise low-voltage outputs (e.g., 1.2V, 1.8V, 2.5V) with standard resistor dividers. |
| Quiescent Current | 35μA (both channels active) - minimizes standby power loss in always-on subsystems. |
| Shutdown Current | <1μA - critical for long-term battery retention in sleep-mode devices. |
| Efficiency Peak | 96% at VOUT = 1.8V, IOUT = 600mA, VIN = 3.6V - reduces thermal load and extends runtime. |
| Package | 8-lead 3mm × 3mm DFN with exposed pad - provides low θJA = 40°C/W for reliable 600mA operation without heatsinking. |
Pinout & Package
Package: 8-lead (3mm × 3mm) plastic DFN (DD package), 0.75mm profile, exposed pad (Pin 9) soldered to PCB ground for thermal and electrical integrity. Pin count and layout match LTC3419EDD#TRPBF and LTC3419IDD-1#TRPBF variants.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VFB1 (Pin 1) | Channel 1 feedback input | Connects to resistor divider on VOUT1; regulated to 0.6V for output voltage setting. |
| RUN1 (Pin 2) | Channel 1 enable control | High (≥1.2V) enables regulator 1; low (≤0.4V) forces shutdown with <1μA IQ. |
| MODE (Pin 3) | Light-load mode select | Ground = Burst Mode®; VIN = pulse-skipping mode - no floating allowed. |
| SW1 (Pin 4) | Channel 1 switch node | Connects to inductor; swings between VIN and GND; requires low-inductance layout. |
| VIN (Pin 5) | Main power input | 2.5–5.5V supply; must be decoupled with ≥10μF ceramic + 0.1μF high-frequency cap. |
| SW2 (Pin 6) | Channel 2 switch node | Independent switching node for second buck stage; identical routing requirements as SW1. |
| RUN2 (Pin 7) | Channel 2 enable control | Functionally identical to RUN1; allows independent on/off control of second regulator. |
| VFB2 (Pin 8) | Channel 2 feedback input | Regulated to same 0.6V reference; supports independent output voltage programming. |
| Exposed Pad (Pin 9) | Thermal & electrical ground | Must be soldered to solid PCB ground plane; primary path for heat dissipation. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent regulators | Two fully functional, internally compensated buck converters in one 3mm × 3mm DFN - eliminates need for discrete solutions or multiple ICs. |
| 100% duty cycle operation | Enables dropout mode where VOUT ≈ VIN − IOUT × RDS(ON) - preserves functionality as battery discharges below regulated output. |
| No external Schottky diodes required | Integrated synchronous rectification (P-ch + N-ch MOSFETs) eliminates conduction losses and thermal overhead of external diodes. |
| Internal soft-start per channel | ≈750μs monotonic VOUT ramp prevents inrush current into output capacitors - protects source and avoids system brownouts. |
| Ceramic capacitor compatibility | Internally compensated loop works stably with zero-ESR ceramic output caps - enables ultra-low ripple and minimal board area. |
| Short-circuit protection | Automatic frequency reduction and forced bottom-FET conduction during overload - prevents inductor saturation and thermal runaway. |
Applications
| Mobile Baseband Power | Digital Camera Core Supply |
|---|---|
Use Scenario: Powering ARM-based application processors and DDR memory in smartphones with dual-rail requirements (e.g., 1.2V core, 1.8V I/O). IC Role / Device Role / Timing Role: Dual synchronous buck regulator delivering tightly regulated, independently enabled 600mA outputs with fast transient response. Use Value: Enables simultaneous core and interface rail generation in <10mm² footprint while maintaining >94% efficiency at 300mA load per rail. |
Use Scenario: Supplying image sensor analog front-end (1.8V) and digital ISP core (2.5V) in compact digital still cameras. IC Role / Device Role / Timing Role: Dual-channel DC/DC converter with independent RUN pins allowing staggered power-up sequencing and low-noise analog supply isolation. Use Value: Reduces EMI-sensitive analog noise by separating switching nodes and supporting Burst Mode® on digital rail only. |
| Wireless Modem RF/BB Partitioning | Portable Media Player SoC Rails |
Use Scenario: Generating clean 1.5V RF transceiver and 3.3V baseband processor supplies in LTE/5G IoT modems. IC Role / Device Role / Timing Role: Dual buck regulator with 2.25MHz switching - keeps fundamental noise above sensitive RF bands and simplifies filtering. Use Value: Achieves <20mVP-P output ripple with 10μF ceramic caps, meeting stringent RF supply noise specs without ferrite beads. |
Use Scenario: Powering audio codec (1.2V), NAND flash interface (2.5V), and display driver (3.3V) in MP3/MP4 players. IC Role / Device Role / Timing Role: Dual adjustable buck with 0.6V reference - supports legacy and modern low-voltage SoC rails from single Li-ion cell. Use Value: 100% duty cycle extends usable battery range to 2.7V, adding ~12% runtime versus non-dropout alternatives. |
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 |
|---|---|---|---|
| TPS62150ARGTR | Single-channel 1A buck; 2.5–6V input; 3MHz switching; no dual-output capability. | Requires two ICs to match LTC3419IDD#TRPBF's dual 600mA functionality - increases BOM count and layout area. | Select only when higher per-channel current (1A) is needed and dual-rail integration is not required. |
| RTQ2132BGQW | Dual 600mA buck; 2.7–5.5V input; 2.4MHz; integrated compensation; but no Burst Mode® - only pulse-skipping and forced PWM. | Lacks ultra-low-IQ light-load mode; quiescent current is 25μA (vs 35μA active, <1μA shutdown for LTC3419IDD#TRPBF). | Prefer LTC3419IDD#TRPBF for battery-critical applications requiring sub-μA shutdown and selectable efficiency modes. |
Compared with TPS62150ARGTR and RTQ2132BGQW, the LTC3419IDD#TRPBF uniquely combines true dual 600mA regulation, selectable Burst Mode®/pulse-skipping, 100% duty cycle, and DFN-8 thermal performance - making it optimal for space- and battery-limited dual-rail portable designs.
Availability
LTC3419IDD#TRPBF is available at Aetrix Electronics and suitable for mobile baseband power, digital camera core supply, wireless modem RF/BB partitioning, portable media player SoC rails, and PDA/Palmtop PC power management requiring stable component supply across industrial temperature grades.
Supply support for LTC3419IDD#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. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving industrial, automotive, communications, and consumer markets.
The LTC3419 product line was designed specifically for high-density, multi-rail power conversion in battery-powered portable electronics - emphasizing ultra-low quiescent current, small封装, and robust light-load efficiency without sacrificing transient performance.
FAQ
What is the operating temperature range for the LTC3419IDD#TRPBF?
The LTC3419IDD#TRPBF is specified for operation from –40°C to +125°C junction temperature. Its "I" grade designation confirms full performance assurance across this extended industrial temperature range, unlike the "E" grade which is only guaranteed from 0°C to 85°C. Thermal design must account for θJA = 40°C/W and the exposed pad's requirement for solid PCB ground connection.
Does the LTC3419IDD#TRPBF require external compensation components?
No, the LTC3419IDD#TRPBF is internally compensated and designed to operate stably with all-ceramic output capacitors - eliminating external compensation networks. This simplifies layout and reduces bill-of-materials cost. Feedback capacitors (CF1/CF2) may be added optionally to improve high-frequency phase margin, but are not required for basic operation.
How does the MODE pin affect efficiency and output ripple in the LTC3419IDD#TRPBF?
When the MODE pin is grounded, the LTC3419IDD#TRPBF enters Burst Mode® operation - delivering high efficiency (>85%) down to 100μA loads but with higher output ripple (20mVP-P typical). When tied to VIN, it operates in pulse-skipping mode - maintaining constant 2.25MHz switching and lower ripple (<10mVP-P) at the expense of reduced light-load efficiency. The choice depends on system trade-offs between battery life and noise sensitivity.
Can the LTC3419IDD#TRPBF support different output voltages on each channel?
Yes, the LTC3419IDD#TRPBF supports independent output voltages via separate resistor dividers on VFB1 and VFB2. Each channel regulates its respective feedback pin to 0.6V, so VOUT1 = 0.6V × (1 + R1/R2) and VOUT2 = 0.6V × (1 + R3/R4). Fixed-output variants (e.g., LTC3419-1) exist, but the LTC3419IDD#TRPBF is the adjustable version requiring external resistors.
What is the maximum recommended output current per channel for the LTC3419IDD#TRPBF in continuous operation?
The LTC3419IDD#TRPBF is rated for up to 600mA continuous output current per channel under typical conditions (VIN = 3V, VOUT = 1.8V, TA = 25°C, proper PCB thermal design). Derating is required at higher ambient temperatures or lower input voltages due to increased conduction losses - e.g., at 85°C ambient, max continuous current drops to ~450mA per channel with 3mm × 3mm DFN layout and 1-in² 2-oz copper pour.
LTC3419IDD#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:
- 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#TRPBF FAQ
1.How can I place an order for LTC3419IDD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3419IDD#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#TRPBF reliable?
The price and inventory of LTC3419IDD#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#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3419IDD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3419IDD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3419IDD#TRPBF?
LTC3419IDD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3419IDD#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#TRPBF?
For technical support, including LTC3419IDD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3419IDD#TRPBF requirements.
6.How does Aetrix verify that LTC3419IDD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3419IDD#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#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3419IDD#TRPBF?
All LTC3419IDD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3419IDD#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#TRPBF part is unused and in its original packaging.
Return procedure for LTC3419IDD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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