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Analog Devices Inc. LTC3619EDD#PBF
- Part No.:
- LTC3619EDD#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LTC3619EDD#PBF.pdf
- Description:
- IC REG BUCK ADJ DL 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:242
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Product details
Overview
LTC3619EDD#PBF 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 across 2.5V–5.5V input. It features programmable average input current limiting (±5% accuracy), 2.25MHz switching, 0.6V feedback reference, and 100% duty cycle for low-dropout operation-ideal for USB-powered handheld devices and Li-ion battery systems.
For engineers reviewing the LTC3619EDD#PBF datasheet, LTC3619EDD#PBF pinout, LTC3619EDD#PBF application, or LTC3619EDD#PBF equivalent, key selection criteria include dual-output current capability, input current limit programming via RLIM, independent soft-start per channel, Power Good monitoring per output, and thermal performance in the 3mm × 3mm DFN package with exposed GND pad.
Technical Context
The LTC3619EDD#PBF implements a dual-channel, in-phase, constant-frequency (2.25MHz) current-mode architecture sharing one oscillator. Each channel uses independent error amplifiers, peak-current sensing, and anti-shoot-through logic to regulate output voltage via external resistive dividers referenced to 0.6V.
Input current limiting is achieved by summing scaled inductor current signals from both channels at the RLIM pin; when the integrated current exceeds 1V threshold, Channel 2 enters current limit while Channel 1 remains regulated. Burst Mode® operation enables 50µA quiescent current at light loads with <25mVP-P output ripple.
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 (Ch1 / Ch2) | 400mA / 800mA - enables independent power rails for core logic and I/O/peripherals in compact portable designs. |
| Switching Frequency | 2.25MHz (±25%) - allows use of sub-2.2µH inductors and reduces footprint vs lower-frequency buck regulators. |
| Feedback Reference Voltage | 0.6V ±2% - supports precise low-voltage outputs (e.g., 1.0V, 1.2V, 1.8V) with standard resistor divider tolerances. |
| Avg Input Current Limit Accuracy | ±5% - ensures reliable USB port compliance and prevents host supply collapse during transient load surges. |
| Quiescent Current (Burst Mode) | 50µA - extends battery runtime in standby/sleep states without sacrificing fast wake-up response. |
| Power Good Threshold | ±7% window - provides robust output voltage monitoring with built-in blanking (90µs) to reject switching noise. |
| Operating Junction Temp | –40°C to 85°C - qualified for commercial and industrial portable equipment environments. |
Pinout & Package
Package: 10-lead 3mm × 3mm plastic DFN with exposed GND pad (Pin 11), thermally enhanced for high-power-density applications. Requires soldering of exposed pad 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 from VOUT1; regulates output to 0.6V reference with ±2% accuracy. |
| RUN1 (Pin 2) | Channel 1 enable control | Logic-high (>1.2V) enables Channel 1; logic-low (<0.4V) shuts down with ≤1µA shutdown current. |
| RLIM (Pin 3) | Input current limit programming | Resistor-to-GND sets avg input current limit (e.g., 116kΩ = 475mA); capacitor adds filtering for pulse-load response tuning. |
| PGOOD1 (Pin 4) | Channel 1 power-good indicator | Open-drain output pulled low when VFB1 is outside ±7% window; requires external pull-up for system monitoring. |
| SW1 (Pin 5) | Channel 1 switch node | Connects to inductor; swings between VIN and GND; requires low-ESR ceramic output capacitor and layout optimization. |
| VIN (Pin 6) | Main power input | Supplies both channels; requires local 10µF ceramic + 0.1µF HF decoupling close to pin. |
| SW2 (Pin 7) | Channel 2 switch node | Independent high-side switching node for second buck stage; shares VIN but has separate inductor and output cap. |
| PGOOD2 (Pin 8) | Channel 2 power-good indicator | Functionally identical to PGOOD1 but monitors VFB2; enables independent rail sequencing and fault isolation. |
| RUN2 (Pin 9) | Channel 2 enable control | Independent enable/disable control for Channel 2; supports staggered startup or dynamic rail disable. |
| VFB2 (Pin 10) | Channel 2 feedback input | Same function as VFB1 but for second output; allows independent regulation of two distinct voltage domains. |
| GND (Pin 11) | Power and signal ground | Exposed thermal pad; must be soldered to PCB ground plane for thermal dissipation (θJA = 40°C/W) and noise reduction. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent soft-start | 0.95ms ramp time per channel - prevents inrush current on individual outputs during power-up or re-enabling. |
| Programmable input current limit | 200mA–500mA range via single RLIM resistor - protects USB hosts and supercapacitor sources without external current-sense ICs. |
| Burst Mode® operation | 50µA IQ with <25mVP-P ripple - maintains regulation at microamp loads while minimizing switching losses in battery-critical modes. |
| 100% duty cycle low-dropout | Enables VOUT ≈ VIN – IOUT×RDS(ON) - extends runtime in deep discharge states (e.g., Li-ion down to 2.7V). |
| Short-circuit protection | Automatic frequency reduction and N-FET forced conduction - limits peak inductor current and prevents thermal runaway during output faults. |
| ±2% output voltage accuracy | Over full temperature and line/load range - eliminates need for post-regulation trimming in precision analog or RF subsystems. |
Applications
| USB-Powered Portable Devices | Li-ion Battery-Powered Handhelds |
|---|---|
Use Scenario: Dual-rail power for ARM Cortex-M microcontroller (1.2V core) and 3.3V peripherals in Bluetooth earbuds or smartwatches. IC Role / Device Role / Timing Role: Primary DC/DC converter providing isolated, sequenced, and monitored power domains from single USB or battery source. Use Value: Enables compact form factor via 2.25MHz operation and eliminates need for discrete current-limiting circuitry on USB input. |
Use Scenario: Power management in GPS trackers with GSM pulse loads (2A bursts) and always-on sensor subsystems. IC Role / Device Role / Timing Role: Dual-output buck regulator supplying processor (1.8V) and radio (3.4V) with independent enable and Power Good signaling. Use Value: Programmable input current limit prevents battery voltage droop during GSM transmit pulses, maintaining stable MCU operation. |
| Supercapacitor Backup Systems | Multi-Rail Embedded Controllers |
Use Scenario: Charging and regulating supercapacitor banks used for ride-through during main power loss in IoT gateways. IC Role / Device Role / Timing Role: Constant-current/constant-voltage charger and backup regulator with input current limiting to protect supercap source. Use Value: RLIM-based current limiting avoids over-stressing supercapacitors during charge cycles; Burst Mode extends hold-up time. |
Use Scenario: Powering FPGA I/O banks (2.5V), core logic (1.0V), and transceivers (3.3V) in industrial PLC modules. IC Role / Device Role / Timing Role: Dual synchronous buck controller enabling independent voltage scaling, sequencing, and fault reporting per rail. Use Value: Independent RUN pins and PGOOD outputs support custom power-up/down sequences and real-time rail health monitoring. |
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; 2.5MHz fixed frequency; 0.6V reference. | Lacks dual output and programmable input current limiting; suitable only when second rail is generated elsewhere. | Select only if system requires only one regulated rail and input current limiting is handled externally. |
| LTC3619BEDD#PBF | Low-noise pulse-skipping variant; identical pinout and specs except optimized for reduced EMI in RF-sensitive layouts. | Preferred for GSM/Bluetooth/WiFi coexistence where switching noise must be minimized near antennas or ADCs. | Choose LTC3619BEDD#PBF when EMI compliance (e.g., CISPR-22 Class B) is critical; otherwise LTC3619EDD#PBF offers same functionality at lower cost. |
Compared with TPS62150ARGTR, LTC3619EDD#PBF delivers true dual-rail integration and USB-safe input current control; versus LTC3619BEDD#PBF, it trades slightly higher EMI for broader availability and identical functional behavior in non-RF-constrained designs.
Availability
LTC3619EDD#PBF is available at Aetrix Electronics and suitable for USB-powered devices, Li-ion battery systems, supercapacitor charging circuits, and multi-rail embedded controllers requiring stable component supply and long-term production continuity.
Supply support for LTC3619EDD#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 and maintains its legacy of high-performance power management ICs with rigorous automotive and industrial qualification standards.
The LTC3619EDD#PBF belongs to Linear's monolithic synchronous buck regulator product line, designed specifically for space-constrained, battery-operated applications demanding dual outputs, input current limiting, and ultra-low quiescent power.
FAQ
What is the maximum output current capability of each channel in the LTC3619EDD#PBF?
The LTC3619EDD#PBF delivers up to 400mA on Channel 1 and 800mA on Channel 2 under typical conditions (VIN = 5V, TA = 25°C). Peak switch current limits are 800mA (Ch1) and 1600mA (Ch2), but sustained output is constrained by thermal limits in the 3mm × 3mm DFN package. Derating is required above 85°C ambient or with poor PCB copper area.
How does the programmable input current limit function in the LTC3619EDD#PBF?
The LTC3619EDD#PBF uses an external resistor (RLIM) from Pin 3 to GND to set the average input current limit. For example, 116kΩ yields 475mA with ±5% accuracy. When total input current exceeds this value, Channel 2 enters current limit while Channel 1 remains fully regulated-enabling prioritized power delivery during USB current budget constraints.
Can the LTC3619EDD#PBF operate with 100% duty cycle, and what are the implications?
Yes, the LTC3619EDD#PBF supports 100% duty cycle for low-dropout operation when VIN approaches VOUT. In this mode, the P-channel MOSFET remains continuously on, and output voltage equals VIN minus IOUT×RDS(ON). RDS(ON) increases at lower VIN, so worst-case power dissipation must be calculated to ensure junction temperature stays below 125°C.
What is the purpose of the CLIM capacitor connected to the RLIM pin of the LTC3619EDD#PBF?
The CLIM capacitor (e.g., 2200pF) integrates the current signal at the RLIM pin to smooth transient responses and prevent false triggering during short load pulses. Its value determines the delay before input current limiting engages-smaller values (e.g., 2.2nF) respond faster for narrow pulses, while larger values (e.g., 0.1µF) provide slower, more stable limiting for longer transients.
Does the LTC3619EDD#PBF support independent power sequencing between its two outputs?
Yes, the LTC3619EDD#PBF supports independent sequencing via separate RUN1 (Pin 2) and RUN2 (Pin 9) inputs. Each channel has dedicated soft-start (≈950µs ramp) and Power Good outputs (PGOOD1/Pgood2), enabling flexible startup order, fault isolation, and dynamic rail enable/disable-critical for FPGA, DSP, or multi-core SoC power architectures.
LTC3619EDD#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-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):
- 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)
LTC3619EDD#PBF FAQ
1.How can I place an order for LTC3619EDD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3619EDD#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 LTC3619EDD#PBF reliable?
The price and inventory of LTC3619EDD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3619EDD#PBF is usually 5 days.
3.What payment methods are accepted for LTC3619EDD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3619EDD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3619EDD#PBF?
LTC3619EDD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3619EDD#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 LTC3619EDD#PBF?
For technical support, including LTC3619EDD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3619EDD#PBF requirements.
6.How does Aetrix verify that LTC3619EDD#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3619EDD#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 LTC3619EDD#PBF meets industry standards.
7.What is the process for return or replacement of LTC3619EDD#PBF?
All LTC3619EDD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3619EDD#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 LTC3619EDD#PBF part is unused and in its original packaging.
Return procedure for LTC3619EDD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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