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Analog Devices Inc. LTC3404MPMS8#TRPBF
- Part No.:
- LTC3404MPMS8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC3404MPMS8#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 600MA 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,875
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Product details
Overview
LTC3404MPMS8#TRPBF from Analog Devices (formerly Linear Technology) is a high-efficiency monolithic synchronous buck regulator with current-mode control, designed for single Li-Ion battery-powered systems. It delivers up to 600mA output current at VIN = 3.3V, operates from 2.65V to 6V input, features 1.4MHz fixed switching frequency, and achieves up to 95% efficiency in Burst Mode operation - ideal for portable instrumentation and wireless modems.
For engineers reviewing the LTC3404MPMS8#TRPBF datasheet, LTC3404MPMS8#TRPBF pinout, LTC3404MPMS8#TRPBF application, or LTC3404MPMS8#TRPBF equivalent, key selection criteria include its –55°C to 125°C extended temperature rating, 10μA quiescent current in operation, 0.8V feedback reference enabling low-output-voltage designs, and synchronization capability from 1MHz to 1.7MHz for noise-sensitive systems.
Technical Context
The LTC3404MPMS8#TRPBF implements a constant-frequency, current-mode synchronous buck architecture with integrated P-channel main and N-channel synchronous MOSFETs. Its internal 0.8V reference enables precise output regulation down to 0.8V, while slope compensation ensures stability above 40% duty cycle.
It supports dual operating modes: selectable Burst Mode (≤10μA IQ) for ultra-low-load efficiency or pulse-skipping PWM for reduced output ripple. Frequency synchronization via the SYNC/MODE pin disables Burst Mode and locks the internal VCO (1–1.7MHz) to an external clock, with phase alignment to the rising edge of the sync signal.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.65V to 6V - supports single-cell Li-Ion (2.7–4.2V) with headroom for charging and dropout margin. |
| Output Current | 600mA at VIN = 3.3V - sufficient for RF transceivers, microcontrollers, and sensor subsystems in portable equipment. |
| Switching Frequency | 1.4MHz typical (1.25–1.65MHz) - enables use of compact 4.7μH inductors and ceramic output capacitors. |
| Quiescent Current | 10μA in Burst Mode - extends battery runtime in standby or low-duty-cycle monitoring applications. |
| Feedback Reference | 0.8V ±2% - allows accurate, low-noise output voltage setting from 0.8V to 6V using external resistor divider. |
| Operating Temperature | –55°C to +125°C - qualified for harsh industrial, automotive under-hood, and military-grade embedded systems. |
| Efficiency | Up to 95% at full load - minimizes thermal stress and power loss in space-constrained PCB layouts. |
| Protection Features | Overcurrent, overtemperature, and output overvoltage lockout (20–110mV above VFB) - ensures robust fault recovery without external circuitry. |
Pinout & Package
Package: 8-lead MSOP (3mm × 3mm, 0.85mm height), thermally enhanced with exposed pad (GND-connected). Pin pitch: 0.65mm. RoHS-compliant, lead-free (#TRPBF).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RUN (Pin 1) | Enable/Shutdown Control | Logic-high (>1.2V) enables regulation; <0.4V forces shutdown (<1μA IQ); must not float. |
| ITH (Pin 2) | Error Amplifier Compensation Node | Controls peak inductor current threshold; nominal range 0.5V–1.9V; used for loop compensation and current limit setting. |
| VFB (Pin 3) | Feedback Input | Monitors resistive divider output; regulates VOUT by servoing to 0.8V reference; supports remote sensing. |
| GND (Pin 4) | Power and Signal Ground | Common return for all internal circuits and external components; connects to exposed thermal pad. |
| SW (Pin 5) | Switch Node | Drain connection of internal P- and N-channel MOSFETs; high dv/dt node requiring tight layout and minimal trace area. |
| VIN (Pin 6) | Main Power Input | Supplies internal bias and power switches; requires local 10μF ceramic decoupling to GND (Pin 4). |
| SYNC/MODE (Pin 7) | Sync Clock Input / Mode Select | Tied to VIN → Burst Mode; grounded → pulse-skipping; 1–1.7MHz external clock → synchronized PWM. |
| PLL LPF (Pin 8) | Phase Detector Output / VCO Control | Drives external RC filter (e.g., 10kΩ + 2200pF) to set VCO frequency during sync; open when unused. |
Key Features
| Feature | Design Value |
|---|---|
| No external Schottky diode required | Integrated synchronous N-channel MOSFET eliminates conduction loss and thermal footprint of discrete diode. |
| 100% duty cycle low-dropout operation | Maintains regulation even when VIN ≈ VOUT (e.g., 3.3V out from 3.4V input), extending usable battery life. |
| Selectable Burst Mode or pulse skipping | Engineer chooses trade-off: ultra-low IQ (10μA) vs. low-noise, low-ripple PWM - no hardware change needed. |
| Internal slope compensation | Prevents subharmonic oscillation above 40% duty cycle, enabling stable operation across full input/output range. |
| ±2% output voltage accuracy | Ensures reliable power delivery to precision analog circuits and low-voltage logic without post-regulation trimming. |
| Thermal shutdown and current limiting | Self-protecting under overload or poor heatsinking; recovers automatically after fault removal. |
Applications
| Wireless Modem Power Supply | Portable Instrument Core Rail |
|---|---|
Use Scenario: Powers baseband processor and RF front-end in LTE/Wi-Fi modems operating from single Li-Ion cell. IC Role / Device Role / Timing Role: Primary step-down regulator delivering stable 1.8V or 3.3V core voltage with fast transient response to bursty data traffic. Use Value: 95% efficiency at 300mA and 10μA quiescent current in idle mode directly extend modem operational time between charges. | Use Scenario: Supplies ADC, microcontroller, and display driver in handheld test equipment with wide ambient temperature range. IC Role / Device Role / Timing Role: High-accuracy, low-noise DC/DC converter providing clean 2.5V reference rail and 3.3V digital supply. Use Value: –55°C to 125°C rating and ±2% output accuracy ensure metrology-grade performance across environmental extremes. |
| Distributed Battery-Powered Sensor Node | Industrial Telematics Module |
Use Scenario: Powers ultra-low-power MCU and BLE radio in remote environmental sensor nodes powered by coin-cell or small Li-Po. IC Role / Device Role / Timing Role: Efficient buck regulator enabling multi-year battery life via Burst Mode operation and <1μA shutdown current. Use Value: 10μA operating IQ and programmable shutdown reduce average system power to sub-100μW during sleep cycles. | Use Scenario: Provides regulated 5V and 3.3V rails in vehicle-mounted telematics units exposed to engine bay temperatures. IC Role / Device Role / Timing Role: Robust primary DC/DC stage converting 9–16V automotive input to stable intermediate bus for secondary regulators. Use Value: Extended temperature qualification and overvoltage lockout protect downstream electronics during load-dump transients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62130ARGTR | 3–17V input, 3A output, 2.5MHz switching, 17μA IQ - higher voltage range and current, but wider package (QFN-16) and no extended temp grade. | Better suited for 12V industrial inputs or higher-current loads; lacks –55°C rating and Burst Mode optimization for Li-Ion. | Choose TPS62130ARGTR only if input exceeds 6V or output current >600mA is required; verify thermal design for 125°C ambient. |
| MAX17504ATP+T | 4.5–60V input, 2A output, 100kHz–2.2MHz adjustable freq, 100μA IQ - wide VIN, higher current, but significantly higher quiescent current and no extended temp option. | Targeted at 24V/48V industrial systems; unsuitable for single-cell Li-Ion due to minimum 4.5V VIN and 10× higher IQ. | Select MAX17504ATP+T for high-input-voltage distributed power; avoid for battery-powered portable designs where LTC3404MPMS8#TRPBF's 10μA IQ is critical. |
Compared with TPS62130ARGTR and MAX17504ATP+T, the LTC3404MPMS8#TRPBF uniquely balances ultra-low quiescent current, Li-Ion-compatible input range, extended temperature reliability, and compact MSOP packaging - making it optimal for space- and energy-constrained portable systems requiring long service life.
Availability
LTC3404MPMS8#TRPBF is available at Aetrix Electronics and suitable for wireless modems, portable instrumentation, distributed sensor networks, industrial telematics, and battery-powered medical devices requiring stable component supply across extended temperature ranges.
Supply support for LTC3404MPMS8#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. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors.
The LTC3404MPMS8#TRPBF belongs to Linear's legacy µPower synchronous buck regulator family, engineered specifically for high-efficiency, low-quiescent-current power conversion in portable and harsh-environment electronics.
FAQ
What is the maximum output current capability of the LTC3404MPMS8#TRPBF at 3.3V input?
The LTC3404MPMS8#TRPBF delivers up to 600mA output current when VIN = 3.3V, as confirmed in the datasheet's "Features" section and Figure 1 (Maximum Output Current vs Input Voltage). This rating assumes proper thermal management, 4.7μH inductor, and recommended ceramic input/output capacitors. At lower input voltages (e.g., 2.65V), maximum output current decreases due to increased RDS(ON) and reduced duty-cycle headroom.
Does the LTC3404MPMS8#TRPBF support output voltages below 1.0V?
Yes, the LTC3404MPMS8#TRPBF supports output voltages as low as 0.8V, enabled by its precise 0.8V internal feedback reference (±2% over –55°C to 125°C). Using the formula VOUT = 0.8V × (1 + R1/R2), designers can set outputs like 0.9V or 1.0V with appropriate resistor ratios. The device maintains regulation and stability down to this minimum, provided external components meet layout and ESR requirements.
How does Burst Mode operation affect output voltage ripple on the LTC3404MPMS8#TRPBF?
Burst Mode operation on the LTC3404MPMS8#TRPBF increases low-frequency output ripple (typically 20–100kHz envelope) due to intermittent switching bursts, but reduces RMS ripple magnitude at light loads. This trade-off improves efficiency at <10mA loads while potentially interfering with sensitive analog circuits. For low-ripple requirements, tie SYNC/MODE to GND to enable pulse-skipping mode, which maintains constant 1.4MHz switching and yields <10mVPP ripple with proper output capacitance.
Can the LTC3404MPMS8#TRPBF be synchronized to an external clock source?
Yes, the LTC3404MPMS8#TRPBF supports external frequency synchronization from 1MHz to 1.7MHz via the SYNC/MODE pin (Pin 7). When driven by a clean CMOS clock, the internal PLL locks the top MOSFET turn-on edge to the rising edge of the external signal. Note that Burst Mode is automatically disabled during synchronization, and the device operates in pulse-skipping mode with reduced light-load ripple.
What thermal considerations apply to the LTC3404MPMS8#TRPBF in 100% duty-cycle dropout operation?
In 100% duty-cycle dropout (e.g., VIN = 3.4V, VOUT = 3.3V), the LTC3404MPMS8#TRPBF relies on the RDS(ON) of its internal P-channel MOSFET (0.7Ω typical) to regulate. Power dissipation becomes PLOSS ≈ IOUT² × RDS(ON), so at 600mA, ~250mW is dissipated internally. With θJA = 125°C/W, this raises junction temperature by ~31°C above ambient - requiring adequate copper area on the exposed pad and verification that TJ stays ≤125°C under worst-case conditions.
LTC3404MPMS8#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.65V
- Voltage - Input (Max):
- 6V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 6V
- Current - Output:
- 600mA
- Frequency - Switching:
- 1.4MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -55°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-MSOP
LTC3404MPMS8#TRPBF FAQ
1.How can I place an order for LTC3404MPMS8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3404MPMS8#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 LTC3404MPMS8#TRPBF reliable?
The price and inventory of LTC3404MPMS8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3404MPMS8#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3404MPMS8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3404MPMS8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3404MPMS8#TRPBF?
LTC3404MPMS8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3404MPMS8#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 LTC3404MPMS8#TRPBF?
For technical support, including LTC3404MPMS8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3404MPMS8#TRPBF requirements.
6.How does Aetrix verify that LTC3404MPMS8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3404MPMS8#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 LTC3404MPMS8#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3404MPMS8#TRPBF?
All LTC3404MPMS8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3404MPMS8#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 LTC3404MPMS8#TRPBF part is unused and in its original packaging.
Return procedure for LTC3404MPMS8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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