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Analog Devices Inc. LTC3619EMSE#PBF
- Part No.:
- LTC3619EMSE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3619EMSE#PBF.pdf
- Description:
- IC REG BUCK ADJ DL 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:144
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Product details
Overview
LTC3619EMSE#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 independent soft-start-optimized for USB-powered handheld devices and Li-ion battery systems requiring high peak load delivery without input rail collapse.
For engineers reviewing the LTC3619EMSE#PBF datasheet, LTC3619EMSE#PBF pinout, LTC3619EMSE#PBF application, or LTC3619EMSE#PBF equivalent, key selection criteria include its dual-output current capability, input current limit programming via RLIM, burst-mode operation (50µA IQ), ±2% output voltage accuracy, and thermal performance in the 10-lead MSOP package with exposed GND pad.
Technical Context
The LTC3619EMSE#PBF implements a dual-channel, in-phase, constant-frequency (2.25MHz) current-mode architecture sharing one oscillator. Each channel uses independent error amplifiers, soft-start timers, and power-good monitors tied to dedicated VFB pins referenced to 0.6V.
Input current limiting is implemented via summed inductor current sensing through matched PFET sense elements; when total input current exceeds the RLIM-set threshold, only Channel 2 is current-limited while Channel 1 remains fully regulated. Dropout operation is supported via 100% duty cycle capability using integrated P-channel high-side switches.
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 operation without external LDO pre-regulation. |
| Output Current (Ch1 / Ch2) | 400mA / 800mA - enables independent point-of-load regulation for core logic and I/O rails in compact portable systems. |
| Switching Frequency | 2.25MHz (typ) - allows use of sub-2.2µH inductors and reduces footprint vs lower-frequency buck regulators. |
| Feedback Reference Voltage | 0.6V ±2% - enables precise low-voltage outputs (e.g., 1.2V, 1.8V) with standard resistor dividers and minimal divider current error. |
| Average Input Current Limit Accuracy | ±5% - ensures reliable USB port compliance and prevents host supply brownout during transient loads. |
| Quiescent Current (Burst Mode) | 50µA - extends battery runtime in standby or low-duty-cycle sensor/communication modes. |
| Shutdown Current | ≤1µA - critical for always-on subsystems requiring nanoamp-level leakage control. |
| Operating Junction Temp | –40°C to 85°C - specified for commercial-grade portable electronics including medical wearables and industrial handhelds. |
Pinout & Package
Package: 10-Lead Plastic MSOP with thermally enhanced exposed GND pad (Pin 11), θJA = 45°C/W. 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 by comparing to 0.6V internal reference. |
| RUN1 (Pin 2) | Channel 1 enable control | High-to-VIN enables Channel 1; low-to-GND shuts down Channel 1 independently of Channel 2. |
| RLIM (Pin 3) | Input current limit programming | Resistor-to-GND sets average input current limit (e.g., 116kΩ = 475mA); capacitor filters transient sensing. |
| PGOOD1 (Pin 4) | Channel 1 power-good indicator | Open-drain output pulled low when VFB1 is outside ±5% to ±11% window; used for sequencing or fault reporting. |
| SW1 (Pin 5) | Channel 1 switch node | Connects to inductor; swings between VIN and GND; requires low-ESR ceramic output capacitor placement nearby. |
| VIN (Pin 6) | Main input supply | 2.5V–5.5V input; must be decoupled with ≥10µF ceramic + 0.1µF high-frequency cap close to pin. |
| SW2 (Pin 7) | Channel 2 switch node | Independent switch node for second buck stage; layout symmetry recommended to minimize EMI coupling. |
| PGOOD2 (Pin 8) | Channel 2 power-good indicator | Functionally identical to PGOOD1 but for Channel 2; enables independent monitoring of dual-rail health. |
| RUN2 (Pin 9) | Channel 2 enable control | Enables/disables Channel 2 independently; supports staggered startup or dynamic rail disabling. |
| VFB2 (Pin 10) | Channel 2 feedback input | Same function as VFB1 but for second output; allows different VOUT1/VOUT2 configurations (e.g., 1.8V/3.3V). |
| GND (Pin 11) | Power and signal ground | Exposed thermal pad; must be soldered to large PCB copper area for thermal dissipation and noise reduction. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable average input current limit | Set via single RLIM resistor (e.g., 116kΩ → 475mA); maintains input rail stability during GSM pulse loads or radio transmit bursts. |
| Dual independent soft-start | 950µs ramp per channel; prevents inrush into large output capacitors and avoids triggering upstream current-limit protection. |
| Burst Mode® operation | 50µA quiescent current with <25mVP-P output ripple; sustains ultra-low-power sleep states without compromising regulation. |
| 100% duty cycle low-dropout mode | Extends battery runtime by maintaining regulation as VIN approaches VOUT; P-channel switch minimizes dropout voltage. |
| Short-circuit protected outputs | Internal N-FET forced conduction during fault limits inductor current runaway; automatic recovery upon fault removal. |
| ±2% output voltage accuracy | Over full temperature and line/load range; eliminates need for post-production trimming in cost-sensitive consumer designs. |
Applications
| USB-Powered Portable Devices | GSM/GPRS Handheld Transmitters |
|---|---|
Use Scenario: Dual-rail power for baseband processor (1.2V/1.8V) and RF front-end (3.3V) in USB-bus-powered field test equipment. IC Role / Device Role / Timing Role: Primary DC/DC converter providing isolated, current-limited, and sequenced outputs directly from 5V USB VBUS. Use Value: Programmable input current limit prevents USB port overcurrent shutdown during RF transmit bursts while maintaining stable core and I/O voltages. |
Use Scenario: Power management in GSM pulse-load applications where 2A peak current occurs every 4.6ms with 12.5% duty cycle. IC Role / Device Role / Timing Role: Dual buck regulator supplying VCC_PA (3.4V/800mA) and VCC_CORE (1.8V/400mA) with synchronized 2.25MHz switching. Use Value: Burst Mode IQ = 50µA extends idle battery life; input current limiting (475mA) prevents VBUS droop during 577µs transmit pulses. |
| Supercapacitor Backup Systems | Industrial Handheld Scanners |
Use Scenario: Charging and regulating supercapacitor banks (2.5F) from USB 5V input for backup power during main supply interruption. IC Role / Device Role / Timing Role: Constant-current/constant-voltage charger controller using Channel 2's current limit and Channel 1's precision 0.6V reference for voltage clamp. Use Value: Independent RUN control allows graceful handoff between primary and backup power; 100% duty cycle sustains regulation as supercap voltage decays. |
Use Scenario: Powering barcode scanner engine (3.3V/600mA), MCU (1.8V/200mA), and display backlight (5V/100mA) in ruggedized handheld units. IC Role / Device Role / Timing Role: Dual-output PMIC replacing discrete buck converters; PGOOD signals coordinate system reset and wake-up sequencing. Use Value: MSOP package fits tight board space; ±2% output accuracy ensures reliable MCU operation across –40°C to 85°C operating range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62150ARGTR | Single-output 1A buck; no input current limit; 2.5MHz fixed frequency; 0.6V reference; 16-pin QFN. | Requires two ICs for dual-rail; lacks programmable input current limiting and independent PGOOD outputs. | Select when only one regulated rail is needed and USB compliance is not required. |
| LTC3619BEMSE#PBF | Pin-compatible variant with low-noise pulse-skipping mode instead of Burst Mode; same input/output specs and package. | Better EMI profile for noise-sensitive RF sections; slightly higher light-load IQ (75µA vs 50µA). | Prefer for applications requiring lower conducted emissions near receivers or ADCs. |
Compared with TPS62150ARGTR, LTC3619EMSE#PBF delivers true dual-channel integration and USB-safe input current limiting; compared with LTC3619BEMSE#PBF, it offers lower quiescent current in Burst Mode at the expense of marginally higher output ripple.
Availability
LTC3619EMSE#PBF is available at Aetrix Electronics and suitable for USB-powered portable devices, GSM transmitter modules, supercapacitor charging circuits, and industrial handheld scanners requiring stable component supply and long-term production continuity.
Supply support for LTC3619EMSE#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 full technical and manufacturing continuity for all Linear power products.
The LTC3619EMSE#PBF belongs to Linear's high-efficiency monolithic buck regulator family, designed specifically for space-constrained, battery-operated systems demanding dual independent outputs with precise input current control and low IQ.
FAQ
What is the maximum output current capability of each channel in LTC3619EMSE#PBF?
The LTC3619EMSE#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 1.6A (Ch2), with thermal derating applied above 85°C junction temperature. The MSOP package's θJA of 45°C/W requires adequate PCB copper for sustained full-load operation.
How is the input current limit programmed on LTC3619EMSE#PBF?
The LTC3619EMSE#PBF uses an external resistor (RLIM) from Pin 3 to GND to set the average input current limit. For example, a 116kΩ resistor programs a 475mA limit (RLIM = 55kΩ / IDC). A capacitor (CLIM) ≥100pF must be placed in parallel with RLIM to integrate sensed current and prevent false triggering during transients.
Does LTC3619EMSE#PBF support 100% duty cycle operation, and what is its significance?
Yes, LTC3619EMSE#PBF supports 100% duty cycle operation using its integrated P-channel high-side switch. This enables low-dropout regulation when VIN approaches VOUT, extending usable battery life in Li-ion systems-e.g., sustaining 3.3V output down to ~3.5V input before dropout occurs.
What are the key differences between LTC3619EMSE#PBF and LTC3619BEMSE#PBF?
LTC3619EMSE#PBF uses Burst Mode® for ultralow IQ (50µA) at light loads, while LTC3619BEMSE#PBF substitutes low-noise pulse-skipping mode (IQ = 75µA) to reduce EMI. Both share identical pinout, package, input/output specs, and current-limit functionality-making them drop-in alternatives where noise or efficiency dominates design priority.
Can LTC3619EMSE#PBF operate with input voltages below 2.5V?
No. The absolute minimum input voltage for LTC3619EMSE#PBF is 2.5V per Absolute Maximum Ratings and Electrical Characteristics tables. Operation below this level risks undervoltage lockout activation (VUV threshold = 2.1V to 2.5V) and undefined regulation behavior. For sub-2.5V inputs, consider alternative regulators such as the LTC3522.
LTC3619EMSE#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:
- 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-MSOP-EP
LTC3619EMSE#PBF FAQ
1.How can I place an order for LTC3619EMSE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3619EMSE#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 LTC3619EMSE#PBF reliable?
The price and inventory of LTC3619EMSE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3619EMSE#PBF is usually 5 days.
3.What payment methods are accepted for LTC3619EMSE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3619EMSE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3619EMSE#PBF?
LTC3619EMSE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3619EMSE#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 LTC3619EMSE#PBF?
For technical support, including LTC3619EMSE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3619EMSE#PBF requirements.
6.How does Aetrix verify that LTC3619EMSE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3619EMSE#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 LTC3619EMSE#PBF meets industry standards.
7.What is the process for return or replacement of LTC3619EMSE#PBF?
All LTC3619EMSE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3619EMSE#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 LTC3619EMSE#PBF part is unused and in its original packaging.
Return procedure for LTC3619EMSE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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