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Analog Devices Inc. LTC3619BEDD#TRPBF
- Part No.:
- LTC3619BEDD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LTC3619BEDD#TRPBF.pdf
- Description:
- IC REG BUCK ADJ DL 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,640
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Product details
Overview
LTC3619BEDD#TRPBF from Analog Devices (formerly Linear Technology) is a dual monolithic synchronous buck regulator with constant-frequency current-mode control, delivering 400mA on Channel 1 and 800mA on Channel 2. It operates from 2.5V to 5.5V input, features programmable average input current limiting (±5% accuracy), 2.25MHz switching frequency, and 0.6V feedback reference for low-output-voltage regulation - ideal for USB-powered handheld devices and supercapacitor charging.
For engineers reviewing the LTC3619BEDD#TRPBF datasheet, LTC3619BEDD#TRPBF pinout, LTC3619BEDD#TRPBF application, or LTC3619BEDD#TRPBF equivalent, key selection criteria include verified dual-channel current capability, confirmed 10-lead 3mm × 3mm DFN package with exposed GND pad, validated input current limit programming via RLIM pin, and documented pulse-skipping operation at light loads.
Technical Context
The LTC3619BEDD#TRPBF implements independent current-mode control per channel with shared 2.25MHz oscillator and in-phase switching. Each channel uses internal P-channel and N-channel MOSFETs (RDS(ON) = 0.45Ω/0.35Ω Ch1, 0.27Ω/0.25Ω Ch2 at VIN = 5V) and features dedicated soft-start (0.95ms typical), power-good monitoring (±7% threshold), and ±2% output voltage accuracy over temperature.
Input current limiting is implemented via external RLIM resistor and CLIM capacitor, enabling precise average input current control (e.g., 475mA with 116kΩ). When total input current exceeds the limit, Channel 2 is actively current-limited while Channel 1 remains fully regulated - a behavior confirmed in functional diagram and transient test data.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5V to 5.5V - supports single-cell Li-ion and USB 2.0/3.0 bus power without external LDO pre-regulation. |
| Output Current Capability | Channel 1: 400mA; Channel 2: 800mA - enables independent powering of core logic and RF subsystems. |
| Switching Frequency | 2.25MHz (typ) - allows use of compact 1.5–4.7µH surface-mount inductors and reduces EMI filtering burden. |
| Feedback Reference Voltage | 0.6V ±2% - enables stable regulation down to 0.6V output with standard resistor dividers. |
| Average Input Current Limit Accuracy | ±5% - ensures predictable sourcing from current-limited supplies like USB ports or supercapacitors. |
| Shutdown Quiescent Current | ≤1µA - minimizes battery drain during system sleep modes. |
| Thermal Performance | θJA = 40°C/W (DD package) - requires minimal PCB copper area for thermal management at full load. |
Pinout & Package
Package: 10-lead 3mm × 3mm plastic DFN with exposed GND pad (Pin 11), rated for –40°C to 125°C junction temperature. Exposed pad must be soldered to PCB ground plane for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VFB1 (Pin 1) | Channel 1 feedback input | Connects to resistive divider from VOUT1; regulates output by comparing to 0.6V internal reference. |
| RUN1 (Pin 2) | Channel 1 enable control | High = enable; low = shutdown; TTL-compatible threshold (0.4–1.2V). |
| RLIM (Pin 3) | Average input current limit programming | Resistor-to-ground sets limit (e.g., 116kΩ = 475mA); CLIM capacitor filters transient response. |
| PGOOD1 (Pin 4) | Channel 1 power-good indicator | Open-drain output pulled low if VFB1 deviates >±7% from 0.6V; requires external pull-up. |
| SW1 (Pin 5) | Channel 1 switch node | Connects to inductor; swings between VIN and GND; high di/dt node requiring tight layout. |
| VIN (Pin 6) | Main input supply | Accepts 2.5–5.5V; requires local 10µF ceramic decoupling close to pin. |
| SW2 (Pin 7) | Channel 2 switch node | Independent switch node for second buck stage; same layout rules as SW1. |
| PGOOD2 (Pin 8) | Channel 2 power-good indicator | Functionally identical to PGOOD1 but monitors VFB2; enables independent rail validation. |
| RUN2 (Pin 9) | Channel 2 enable control | Independent enable/disable control for second regulator; supports staggered startup sequencing. |
| VFB2 (Pin 10) | Channel 2 feedback input | Same function as VFB1 but for second output; enables dual independent voltage rails. |
| GND (Pin 11) | Power and signal ground | Exposed thermal pad; must be soldered to large PCB ground plane for thermal dissipation and noise control. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable average input current limit | Enables reliable operation from current-constrained sources (e.g., USB ports) without collapsing input rail under peak load. |
| Dual independent soft-start | 950µs typical ramp time per channel prevents inrush current on shared input supply and output capacitors. |
| Pulse-skipping mode at light loads | Maintains low output ripple and audio-noise-free operation while achieving >80% efficiency at 1mA load (per channel). |
| 100% duty-cycle dropout operation | Extends battery runtime by sustaining regulation as input voltage drops to within ~150mV of output voltage. |
| Short-circuit protection with frequency foldback | Prevents inductor saturation and thermal runaway during output shorts; resumes normal operation automatically after fault removal. |
Applications
| USB-Powered Portable Instrumentation | Multi-Rail Embedded Microcontroller Systems |
|---|---|
Use Scenario: Handheld multimeter powered from USB 2.0 port with isolated analog front-end and digital display. IC Role / Device Role / Timing Role: Dual buck regulator supplies 1.8V to microcontroller core and 3.3V to precision ADC and LCD driver from single 5V USB input. Use Value: Programmable 475mA input current limit prevents USB port overcurrent shutdown while delivering 800mA peak to ADC sampling bursts. | Use Scenario: Industrial sensor node with ARM Cortex-M4 MCU, BLE radio, and analog signal conditioning. IC Role / Device Role / Timing Role: LTC3619BEDD#TRPBF generates 3.3V for MCU and 1.2V for core logic, with independent RUN control enabling dynamic power gating. Use Value: Independent soft-start and PGOOD signals allow sequenced power-up and fault isolation between digital and RF subsystems. |
| Supercapacitor Backup Power Supply | GSM/GPRS Pulse-Load Transmitter Modules |
Use Scenario: Smart meter with supercapacitor-based backup that powers real-time clock and memory during AC outage. IC Role / Device Role / Timing Role: Regulates 3.3V from decaying supercapacitor (2.5–5.5V range) using 100% duty-cycle capability and low-IQ shutdown. Use Value: Maintains regulation down to 2.5V input while consuming ≤1µA in shutdown - maximizing backup runtime. | Use Scenario: Cellular IoT module transmitting 2A GSM burst pulses every 4.7ms while powered from limited-capacity LiPo cell. IC Role / Device Role / Timing Role: Supplies 3.4V/800mA to PA stage; input current limit set to 475mA with 2.2nF CLIM for 92µs response to 577µs load pulses. Use Value: Prevents battery voltage droop beyond dropout threshold during transmit bursts while maintaining regulated output for 92µs before limiting engages. |
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; no input current limit; 2.5–6V input; 3mm × 3mm QFN-16 | Requires two devices for dual-rail; lacks programmable input current limiting and independent PGOOD outputs | Select only when dual independent regulation and USB-compliant current limiting are not required. |
| MAX20004AATP+T | Dual-channel (400mA/400mA); 2.5–5.5V input; 2.2MHz; no programmable input current limit; 3mm × 3mm TDFN-10 | Equal per-channel current rating but no input current limiting; lower peak output capability than LTC3619BEDD#TRPBF's 800mA Channel 2 | Choose when balanced dual 400mA rails suffice and input current limiting is unnecessary. |
Compared with TPS62150ARGTR and MAX20004AATP+T, the LTC3619BEDD#TRPBF uniquely delivers asymmetric dual outputs (400mA/800mA) with verified ±5% programmable average input current limiting - critical for USB-sourced and supercapacitor-backed systems where input compliance is strictly bounded.
Availability
LTC3619BEDD#TRPBF is available at Aetrix Electronics and suitable for USB-powered portable instrumentation, multi-rail embedded microcontroller systems, supercapacitor backup power supplies, and GSM pulse-load transmitter modules requiring stable component supply across industrial temperature ranges.
Supply support for LTC3619BEDD#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. (including legacy Linear Technology products) designs high-performance analog, mixed-signal, and power management ICs for precision, reliability, and efficiency in demanding applications.
The LTC3619B product line delivers dual synchronous buck regulators optimized for space-constrained, current-limited, and battery-operated systems - emphasizing input current programmability, light-load efficiency, and robust thermal performance in miniature DFN/MSOP packages.
FAQ
What is the operating temperature range for the LTC3619BEDD#TRPBF?
The LTC3619BEDD#TRPBF is specified for operation from –40°C to 125°C junction temperature. Its 10-lead 3mm × 3mm DFN package with exposed GND pad achieves θJA = 40°C/W, enabling full 400mA/800mA output capability at 85°C ambient with appropriate PCB copper area. The "E" grade denotes guaranteed performance from 0°C to 85°C, with –40°C to 125°C range assured by design and characterization.
How is the input current limit programmed on the LTC3619BEDD#TRPBF?
The LTC3619BEDD#TRPBF uses an external resistor (RLIM) from Pin 3 to GND to program average input current limit. For example, a 116kΩ resistor sets a 475mA limit (±5% accuracy). A capacitor (CLIM) from RLIM to GND integrates the current-sense signal; 2200pF yields ~92µs response to fast load pulses. Grounding RLIM disables the feature entirely.
Does the LTC3619BEDD#TRPBF support independent power sequencing between channels?
Yes. The LTC3619BEDD#TRPBF provides independent RUN1 (Pin 2) and RUN2 (Pin 9) inputs, each with TTL-compatible thresholds (0.4–1.2V), enabling staggered startup or selective shutdown. Each channel also has dedicated soft-start (0.95ms typical) and PGOOD outputs (Pins 4 and 8), allowing full control over power-up timing and fault reporting per rail.
What is the minimum output voltage achievable with the LTC3619BEDD#TRPBF?
The LTC3619BEDD#TRPBF supports output voltages down to 0.6V, set by its internal feedback reference voltage. Using standard resistor dividers (e.g., 116kΩ/116kΩ for 1.2V), it maintains ±2% regulation accuracy across load, line, and temperature. The 0.6V reference enables efficient generation of sub-1V core supplies for modern microcontrollers and FPGAs.
Can the LTC3619BEDD#TRPBF operate in 100% duty cycle for low-dropout regulation?
Yes. The LTC3619BEDD#TRPBF supports true 100% duty cycle operation, allowing VOUT to track VIN minus RDS(ON) × ILOAD losses. This extends battery runtime in portable systems by maintaining regulation as input voltage decays - confirmed in dropout operation section and typical performance curves (Figure G16, G17).
LTC3619BEDD#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-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):
- 5V
- Current - Output:
- 400mA, 800mA
- Frequency - Switching:
- 2.25MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-DFN (3x3)
LTC3619BEDD#TRPBF FAQ
1.How can I place an order for LTC3619BEDD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3619BEDD#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 LTC3619BEDD#TRPBF reliable?
The price and inventory of LTC3619BEDD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3619BEDD#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3619BEDD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3619BEDD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3619BEDD#TRPBF?
LTC3619BEDD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3619BEDD#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 LTC3619BEDD#TRPBF?
For technical support, including LTC3619BEDD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3619BEDD#TRPBF requirements.
6.How does Aetrix verify that LTC3619BEDD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3619BEDD#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 LTC3619BEDD#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3619BEDD#TRPBF?
All LTC3619BEDD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3619BEDD#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 LTC3619BEDD#TRPBF part is unused and in its original packaging.
Return procedure for LTC3619BEDD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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