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Analog Devices Inc. LTC3619BIMSE#PBF
- Part No.:
- LTC3619BIMSE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3619BIMSE#PBF.pdf
- Description:
- IC REG BUCK ADJ DL 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,860
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Product details
Overview
LTC3619BIMSE#PBF from Analog Devices (formerly Linear Technology) is a dual monolithic synchronous step-down DC/DC regulator with programmable average input current limit, operating in constant-frequency current mode. It delivers 400mA on Channel 1 and 800mA on Channel 2 across 2.5V–5.5V input, features 0.6V feedback reference, 2.25MHz switching, and 100% duty cycle dropout support - ideal for USB-powered handheld devices and supercapacitor charging.
For engineers reviewing the LTC3619BIMSE#PBF datasheet, LTC3619BIMSE#PBF pinout, LTC3619BIMSE#PBF application, or LTC3619BIMSE#PBF equivalent, key selection criteria include verified input current limit accuracy (±5%), independent soft-start per channel, dual PGOOD outputs, thermal performance in MSOP package (θJA = 45°C/W), and validated pulse-skipping operation at light loads.
Technical Context
The LTC3619BIMSE#PBF implements a dual-channel, in-phase, constant-frequency current-mode control architecture with shared 2.25MHz oscillator. Each channel uses independent error amplifiers, peak-current sensing via internal PFET/NFET switches, and dedicated soft-start ramping (0.95ms typical) to regulate output voltage against a precise 0.6V reference.
Input current limiting is achieved by summing scaled inductor current signals from both channels at the RLIM pin; when the integrated IRLIM current reaches 1V threshold, Channel 2's on-time is reduced while Channel 1 remains fully regulated - enabling high peak load delivery without collapsing a current-limited source like USB.
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 1µH–4.7µH surface-mount inductors and reduces output capacitor size. |
| Feedback Reference Voltage | 0.6V ±2% - enables low-output-voltage regulation (e.g., 1.2V, 1.8V) with standard resistor dividers. |
| Average Input Current Limit Accuracy | ±5% - ensures reliable compliance with USB 2.0 (500mA) and USB 3.0 (900mA) host port current limits. |
| Shutdown Quiescent Current | ≤1µA - preserves battery life in always-on standby modes for portable equipment. |
| Thermal Resistance (θJA) | 45°C/W (MSOP-10) - requires minimal PCB copper area for thermal management in space-constrained layouts. |
Pinout & Package
The LTC3619BIMSE#PBF is housed in a thermally enhanced 10-lead plastic MSOP package (3mm × 3mm footprint, 1.1mm height) with exposed pad (Pin 11) soldered to GND for optimal thermal dissipation and EMI reduction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VFB1 (Pin 1) | Channel 1 feedback input | Connects to resistive divider on VOUT1; regulates output to 0.6V reference with ±2% accuracy. |
| RUN1 (Pin 2) | Channel 1 enable control | Logic-high (>0.4V) enables Channel 1; logic-low (<0.1V) forces shutdown with ≤1µA quiescent current. |
| RLIM (Pin 3) | Input current limit programming | Resistor-to-GND sets average input current limit (e.g., 116kΩ = 475mA); capacitor adds filtering for transient response tuning. |
| PGOOD1 (Pin 4) | Channel 1 power-good indicator | Open-drain output pulled low if VFB1 deviates >±5% from 0.6V; blanked for 90µs during startup. |
| SW1 (Pin 5) | Channel 1 switch node | Connects to inductor; swings between VIN and GND; requires low-ESR ceramic output capacitor at VOUT1. |
| VIN (Pin 6) | Main power input | Supplies both channels; must be decoupled with ≥10µF X5R/X7R ceramic capacitor close to pin. |
| SW2 (Pin 7) | Channel 2 switch node | Independent switch node for second buck stage; supports asymmetric inductor selection vs. Channel 1. |
| PGOOD2 (Pin 8) | Channel 2 power-good indicator | Functionally identical to PGOOD1 but monitors VFB2; enables sequencing or fault isolation in dual-rail systems. |
| RUN2 (Pin 9) | Channel 2 enable control | Independent enable/disable control for Channel 2; supports staggered startup or dynamic rail disabling. |
| VFB2 (Pin 10) | Channel 2 feedback input | Same 0.6V reference as VFB1; allows independent output voltage setting (e.g., 1.8V + 3.3V). |
| GND (Pin 11) | Power and signal ground | Exposed thermal pad; must be soldered to large PCB GND plane for thermal and noise performance. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable average input current limit | Set via single RLIM resistor (±5% accuracy) - prevents USB port overcurrent shutdown while sustaining high peak loads. |
| Dual independent soft-start | 0.95ms typical ramp per channel - eliminates inrush current stress on input capacitors and avoids system brownouts. |
| Pulse-skipping mode at light loads | Reduces switching losses below ~10mA load - maintains >80% efficiency at 100µA while minimizing audible noise and EMI. |
| 100% duty cycle low-dropout operation | Enables VOUT up to VIN − (IOUT × RDS(ON)_PFET) - extends battery runtime in deep discharge conditions. |
| Short-circuit protection | Forces extended bottom-FET conduction to safely discharge inductor - prevents current runaway during output shorts. |
| ±2% output voltage accuracy | Over full temperature range (–40°C to 125°C) - ensures stable core voltage for DSPs, FPGAs, and RF ICs without external trimming. |
Applications
| USB-Powered Portable Devices | Radio Transmitter Power Rails |
|---|---|
Use Scenario: Dual-rail power supply for Bluetooth/Wi-Fi modules in battery-operated IoT sensors, where one rail powers baseband logic (1.8V/400mA) and another powers PA bias (3.3V/800mA). IC Role / Device Role / Timing Role: Primary dual-buck regulator managing input current compliance to USB host limits while delivering clean, sequenced outputs. Use Value: Prevents host port reset during RF transmit bursts by enforcing 475mA average input limit, while maintaining regulated 3.3V output under 800mA peak load. | Use Scenario: Powering GSM/GPRS pulse-load transmitters in handheld radios, requiring rapid 0–2A load transitions without input rail collapse. IC Role / Device Role / Timing Role: Synchronous buck controller with fast transient response and programmable input current limiting to sustain burst-mode operation. Use Value: Delivers 2A peak current from 5V input using Channel 2's 800mA capability plus stored energy in 2.2mF supercap, while holding average input current to 475mA. |
| Supercapacitor Charging Systems | Industrial Handheld Terminals |
Use Scenario: Charging and regulating power from a 5.5V supercapacitor bank to supply 3.3V/1.8V rails for microcontroller and display driver in backup power systems. IC Role / Device Role / Timing Role: Dual-step-down regulator with 100% duty cycle support and accurate input current limiting to control charge rate into supercap. Use Value: Enables controlled 475mA constant-current charge phase followed by regulated 3.3V/1.8V discharge, avoiding supercap overvoltage and thermal stress. | Use Scenario: Power management for ruggedized barcode scanners with ARM Cortex-M7 MCU (1.2V/400mA) and CMOS image sensor (2.8V/600mA). IC Role / Device Role / Timing Role: Dual-channel PMIC providing independent enable, soft-start, and PGOOD monitoring per rail in harsh industrial environments. Use Value: Ensures deterministic power-up sequencing and fault detection via two independent PGOOD outputs, meeting IEC 60950-1 safety requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual 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 - requires external circuitry for USB compliance. | Select only if single-rail design suffices and input current control is handled upstream. |
| LTC3619EMSE#PBF | Same pinout and function but rated for 0°C to 85°C ambient; lower input current limit tolerance (±7% vs ±5%). | Not qualified for extended industrial temperature range (–40°C to 125°C) - unsuitable for automotive or outdoor deployments. | Choose LTC3619BIMSE#PBF for full-spec performance in wide-temperature industrial applications. |
Compared with TPS62150ARGTR and LTC3619EMSE#PBF, the LTC3619BIMSE#PBF uniquely combines dual independent outputs, ±5% programmable input current limiting, and guaranteed –40°C to 125°C operation - eliminating need for external current-sense ICs or derating in thermally demanding designs.
Availability
LTC3619BIMSE#PBF is available at Aetrix Electronics and suitable for USB-powered portable devices, radio transmitter power rails, supercapacitor charging systems, and industrial handheld terminals requiring stable component supply and long-term production continuity.
Supply support for LTC3619BIMSE#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 high-performance power management portfolio with rigorous qualification and long-term support.
The LTC3619BIMSE#PBF belongs to Linear's precision dual buck regulator family, designed specifically for space-constrained, current-limited applications such as USB-powered instrumentation, portable RF systems, and battery-backed industrial controllers.
FAQ
What is the operating temperature range for the LTC3619BIMSE#PBF?
The LTC3619BIMSE#PBF is specified for operation from –40°C to 125°C junction temperature. Its MSOP package has θJA = 45°C/W, so ambient operation up to 85°C is achievable with proper PCB copper area. This rating is guaranteed across the full range, unlike the commercial-grade LTC3619EMSE#PBF.
How does the input current limit function work on the LTC3619BIMSE#PBF?
The LTC3619BIMSE#PBF sums scaled inductor current signals from both channels at the RLIM pin. When the integrated current reaches 1V, Channel 2's on-time is reduced while Channel 1 remains regulated. Setting RLIM = 116kΩ configures a 475mA average input limit - critical for USB 2.0 compliance.
Can the LTC3619BIMSE#PBF operate with 100% duty cycle, and what is the minimum input voltage needed?
Yes, the LTC3619BIMSE#PBF supports 100% duty cycle for low-dropout operation. Minimum input voltage depends on load: for 3.3V output at 800mA, VIN must exceed 3.3V + (0.8A × 0.25Ω) ≈ 3.5V due to Channel 2's bottom-FET RDS(ON). Full regulation is maintained down to VIN = VOUT under light loads.
What are the key differences between the LTC3619BIMSE#PBF and LTC3619EMSE#PBF?
The LTC3619BIMSE#PBF guarantees ±5% input current limit accuracy and full –40°C to 125°C operation. The LTC3619EMSE#PBF is rated 0°C to 85°C with ±7% limit tolerance. Both share identical pinout, package, and functional behavior - making the 'B' grade mandatory for industrial and automotive-adjacent designs.
Does the LTC3619BIMSE#PBF require external compensation components?
No, the LTC3619BIMSE#PBF features internally compensated error amplifiers. Only standard external components are needed: input/output capacitors, power inductors, feedback resistors, RLIM resistor, and optional CLIM capacitor for input current limit response tuning - simplifying layout and reducing BOM count.
LTC3619BIMSE#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad
- Packaging:
- Bulk
- 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-MSOP-EP
LTC3619BIMSE#PBF FAQ
1.How can I place an order for LTC3619BIMSE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3619BIMSE#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 LTC3619BIMSE#PBF reliable?
The price and inventory of LTC3619BIMSE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3619BIMSE#PBF is usually 5 days.
3.What payment methods are accepted for LTC3619BIMSE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3619BIMSE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3619BIMSE#PBF?
LTC3619BIMSE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3619BIMSE#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 LTC3619BIMSE#PBF?
For technical support, including LTC3619BIMSE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3619BIMSE#PBF requirements.
6.How does Aetrix verify that LTC3619BIMSE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3619BIMSE#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 LTC3619BIMSE#PBF meets industry standards.
7.What is the process for return or replacement of LTC3619BIMSE#PBF?
All LTC3619BIMSE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3619BIMSE#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 LTC3619BIMSE#PBF part is unused and in its original packaging.
Return procedure for LTC3619BIMSE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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