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Analog Devices Inc. LTC3619BIDD#TRPBF
- Part No.:
- LTC3619BIDD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LTC3619BIDD#TRPBF.pdf
- Description:
- IC REG BUCK ADJ DL 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,558
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Product details
Overview
LTC3619BIDD#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 across a 2.5V–5.5V input range. It features programmable average input current limiting (±5% accuracy), 2.25MHz switching frequency, and independent soft-start-ideal for USB-powered handheld devices and supercapacitor charging where input supply stability under peak load is critical.
For engineers reviewing the LTC3619BIDD#TRPBF datasheet, LTC3619BIDD#TRPBF pinout, LTC3619BIDD#TRPBF application, or LTC3619BIDD#TRPBF equivalent, key selection criteria include its dual-output current capability, 0.6V feedback reference enabling low-voltage regulation down to 0.6V, ±2% output voltage accuracy, 100% duty-cycle dropout operation, and thermally enhanced 10-lead 3mm × 3mm DFN package with exposed GND pad.
Technical Context
The LTC3619BIDD#TRPBF implements a dual-channel, in-phase, constant-frequency (2.25MHz) current-mode architecture with shared oscillator and independent error amplifiers per channel. Each channel uses internal P-channel and N-channel MOSFETs with RDS(ON) of 0.45Ω/0.35Ω (Ch1) and 0.27Ω/0.25Ω (Ch2) at VIN = 5V, enabling high efficiency up to 96% and fast transient response.
Input current limiting is implemented via external RLIM resistor and CLIM capacitor, with IINLIM programmable from 200mA to 523mA (typical 475mA at RLIM = 116kΩ). When total input current exceeds the limit, Channel 2 enters current-limited mode while Channel 1 remains fully regulated-enabling stable point-of-load delivery even during GSM pulse loads or radio transmitter bursts.
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 VBUS directly without pre-regulation |
| Output Current (Ch1 / Ch2) | 400mA / 800mA - enables independent power rails for core logic and RF subsystems |
| Switching Frequency | 2.25MHz (typ) - allows use of compact 1.5µH–4.7µH surface-mount inductors |
| Feedback Reference | 0.6V ±2% - supports precise low-voltage outputs (e.g., 1.2V, 1.8V) with standard resistor dividers |
| Avg Input Current Limit | 475mA ±5% (RLIM = 116kΩ) - protects USB ports while permitting high peak output currents |
| Efficiency | Up to 96% - minimizes thermal stress in space-constrained handheld enclosures |
| Shutdown Current | ≤1µA - preserves battery life during system sleep modes |
Pinout & Package
Package: 10-lead 3mm × 3mm plastic DFN (DD) with exposed GND pad (Pin 11), θJA = 40°C/W. Requires soldering of exposed pad to PCB ground plane for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VFB1 (Pin 1) | Channel 1 feedback input | Connects to resistor divider on Ch1 output; regulates to 0.6V reference |
| RUN1 (Pin 2) | Channel 1 enable | High = enable; low = shutdown with ≤1µA quiescent current |
| RLIM (Pin 3) | Input current limit programming | Resistor-to-GND sets IINLIM; capacitor filters transient sensing current |
| PGOOD1 (Pin 4) | Channel 1 power-good indicator | Open-drain output asserts low when VFB1 deviates >±5% from 0.6V |
| SW1 (Pin 5) | Channel 1 switch node | Connects to inductor; swings between VIN and GND during operation |
| VIN (Pin 6) | Main input supply | Must be decoupled with ≥10µF ceramic capacitor close to pin |
| SW2 (Pin 7) | Channel 2 switch node | Independent switch node for second buck stage; same topology as SW1 |
| PGOOD2 (Pin 8) | Channel 2 power-good indicator | Independent open-drain monitor for Ch2 output regulation status |
| RUN2 (Pin 9) | Channel 2 enable | Independent control of Ch2; supports staggered startup or dynamic rail sequencing |
| VFB2 (Pin 10) | Channel 2 feedback input | Separate 0.6V reference input for independent output voltage setting |
| GND (Pin 11) | Power and signal ground | Exposed thermal pad; must be soldered to PCB ground plane for thermal management |
Key Features
| Feature | Design Value |
|---|---|
| Programmable avg input current limit | ±5% accuracy over temperature; prevents USB port collapse during RF burst loads |
| Dual independent soft-start | ~950µs ramp time per channel; eliminates inrush current into large output capacitors |
| Pulse-skipping light-load mode | Maintains low output ripple and audio noise while achieving >80% efficiency at 1mA load |
| 100% duty-cycle dropout | Enables uninterrupted operation as input drops to within ~200mV of output voltage |
| Short-circuit protection | Forces extended bottom-FET conduction to safely discharge inductor during output short |
Applications
| USB-Powered Portable Instruments | GSM/GPRS Handheld Transceivers |
|---|---|
Use Scenario: Battery-powered multimeter with LCD display, microcontroller, and analog front-end requiring clean 3.3V and 1.8V rails. IC Role / Device Role / Timing Role: Dual buck regulator providing isolated, current-limited power domains for digital and analog sections. Use Value: Programmable input current limit ensures compliance with USB 500mA spec while supporting 800mA peak demand on RF section during transmission. | Use Scenario: Cellular modem module handling 2A GSM pulse loads every 4.6ms with tight input voltage tolerance. IC Role / Device Role / Timing Role: Primary DC/DC converter managing both core logic (Ch1) and PA bias (Ch2) with coordinated timing. Use Value: In-phase 2.25MHz operation avoids beat frequencies; Channel 2 current limiting maintains VOUT1 regulation during 2A pulses. |
| Supercapacitor Backup Power Systems | Industrial IoT Sensor Nodes |
Use Scenario: Energy-harvesting node using supercapacitor charged from USB or solar, powering MCU and BLE radio. IC Role / Device Role / Timing Role: Bidirectional-aware buck regulator charging supercap from VIN and regulating output during discharge. Use Value: 100% duty cycle allows full supercap utilization down to 0.6V; low 1µA shutdown current extends backup runtime. | Use Scenario: Wireless sensor with ultra-low-power MCU, LoRa transceiver, and environmental sensors operating on coin cell. IC Role / Device Role / Timing Role: High-efficiency dual rail generator enabling separate voltage scaling for sensor bias and RF interface. Use Value: Pulse-skipping mode delivers >85% efficiency at 100µA load; ±2% output accuracy ensures ADC reference stability. |
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 | Requires two ICs for dual-rail design; lacks programmable input current limiting | Choose when only one regulated rail is needed and USB current compliance is not required |
| MP2143GQ-Z | Dual-channel (600mA/600mA); no programmable input current limit; 2.2MHz; 0.8V reference | Lower max output current per channel; higher feedback voltage limits low-VOUT flexibility | Choose for cost-sensitive dual-rail designs where 0.6V reference and precise input current control are not critical |
Compared with TPS62150ARGTR and MP2143GQ-Z, the LTC3619BIDD#TRPBF uniquely combines asymmetric dual-current capability (400mA/800mA), ±5% programmable input current limiting, and 0.6V reference in a thermally optimized DFN-making it optimal for USB-compliant handhelds with mixed-signal power requirements.
Availability
LTC3619BIDD#TRPBF is available at Aetrix Electronics and suitable for USB-powered portable instruments, GSM transceivers, and supercapacitor backup systems requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LTC3619BIDD#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 acquired Linear Technology in 2017 and maintains its high-performance power management portfolio with rigorous automotive and industrial qualification standards.
The LTC3619B belongs to Linear's precision dual buck regulator product line, designed specifically for space-constrained, battery-operated systems demanding independent rail control, USB current compliance, and robust transient response under pulsed loads.
FAQ
What is the maximum output current capability of each channel in LTC3619BIDD#TRPBF?
The LTC3619BIDD#TRPBF delivers up to 400mA on Channel 1 and 800mA on Channel 2 under typical conditions (VIN = 5V, TA = 25°C, proper layout and thermal management). Peak switch current limits are 800mA (Ch1) and 2.4A (Ch2), but sustained output is constrained by thermal limits and inductor saturation. The LTC3619BIDD#TRPBF datasheet specifies these values under defined test conditions with recommended external components.
How does the programmable average input current limit function in LTC3619BIDD#TRPBF?
The LTC3619BIDD#TRPBF uses an external resistor (RLIM) from Pin 3 to GND to set the average input current limit, with typical values like 116kΩ yielding 475mA. The device sums sensed inductor currents from both channels and compares the integrated result to a 1V threshold. When exceeded, Channel 2 reduces duty cycle while Channel 1 remains regulated. The LTC3619BIDD#TRPBF requires a CLIM capacitor (≥100pF) to filter switching transients and set response time.
Can LTC3619BIDD#TRPBF operate with input voltage as low as 2.5V while maintaining regulation?
Yes, the LTC3619BIDD#TRPBF operates across 2.5V to 5.5V input. At low VIN near the output voltage, it achieves 100% duty cycle to maintain regulation-critical for extending battery runtime in Li-ion systems. However, RDS(ON) of the P-channel switch increases as VIN decreases, so thermal design must account for worst-case power dissipation during dropout. The LTC3619BIDD#TRPBF specification confirms this behavior in its Absolute Maximum Ratings and Typical Performance Characteristics.
What package type and thermal characteristics apply to LTC3619BIDD#TRPBF?
The LTC3619BIDD#TRPBF uses a 10-lead 3mm × 3mm plastic DFN (DD) package with exposed GND pad (Pin 11). Its thermal resistance is θJA = 40°C/W when mounted on a 2-layer PCB with 1in² copper pour connected to the exposed pad. Proper soldering of the exposed pad is mandatory for both thermal performance and electrical grounding. The LTC3619BIDD#TRPBF datasheet specifies TJMAX = 125°C and requires thermal design validation under worst-case load conditions.
Does LTC3619BIDD#TRPBF support independent enable and power-good signaling per channel?
Yes, the LTC3619BIDD#TRPBF provides fully independent RUN1/RUN2 enable inputs and PGOOD1/PGOOD2 open-drain outputs. This allows staggered startup sequencing, individual rail fault detection, and flexible system-level power management. Each PGOOD pin asserts low when its respective VFB pin deviates more than ±5% from 0.6V, and each RUN pin enables its channel when pulled above 1.2V. The LTC3619BIDD#TRPBF functional diagram and Pin Functions section confirm this dual-channel autonomy.
LTC3619BIDD#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)
LTC3619BIDD#TRPBF FAQ
1.How can I place an order for LTC3619BIDD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3619BIDD#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 LTC3619BIDD#TRPBF reliable?
The price and inventory of LTC3619BIDD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3619BIDD#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3619BIDD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3619BIDD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3619BIDD#TRPBF?
LTC3619BIDD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3619BIDD#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 LTC3619BIDD#TRPBF?
For technical support, including LTC3619BIDD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3619BIDD#TRPBF requirements.
6.How does Aetrix verify that LTC3619BIDD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3619BIDD#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 LTC3619BIDD#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3619BIDD#TRPBF?
All LTC3619BIDD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3619BIDD#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 LTC3619BIDD#TRPBF part is unused and in its original packaging.
Return procedure for LTC3619BIDD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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