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Analog Devices Inc. LTC3404MPMS8#PBF
- Part No.:
- LTC3404MPMS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC3404MPMS8#PBF.pdf
- Description:
- IC REG BUCK ADJ 600MA 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:560
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Product details
Overview
LTC3404MPMS8#PBF from Analog Devices (formerly Linear Technology) is a high-efficiency monolithic synchronous buck regulator with current-mode control, 2.65V–6V input range, 1.4MHz fixed switching frequency, 600mA output capability at 3.3V input, and ultra-low 10μA operating quiescent current. It delivers regulated DC-DC conversion for Li-ion–powered portable instrumentation requiring stable low-noise supply under light-load conditions.
For engineers reviewing the LTC3404MPMS8#PBF datasheet, LTC3404MPMS8#PBF pinout, LTC3404MPMS8#PBF application, or LTC3404MPMS8#PBF equivalent, key selection criteria include its –55°C to 125°C extended temperature rating, internal P/N-channel MOSFETs eliminating external Schottky diodes, 0.8V feedback reference enabling sub-1V outputs, Burst Mode™ operation for <1μA shutdown current, and MSOP-8 package compatibility with space-constrained PCB layouts.
Technical Context
The LTC3404MPMS8#PBF implements a constant-frequency, current-mode synchronous buck architecture with integrated 0.7Ω P-channel and 0.8Ω N-channel MOSFETs. Its error amplifier drives the ITH pin to regulate peak inductor current, while slope compensation prevents subharmonic oscillation above 40% duty cycle.
Frequency synchronization via the SYNC/MODE pin supports 1MHz–1.7MHz external clock locking using a phase-locked loop with PLL LPF filter network; Burst Mode™ is automatically disabled during sync to ensure PWM pulse-skipping operation and low-audio-noise performance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.65V to 6V - supports single-cell Li-ion (2.7V–4.2V) and 3.3V/5V rail inputs without external LDO pre-regulation. |
| Output Current | 600mA at VIN = 3.3V - sufficient for powering microcontrollers, RF transceivers, and analog front-ends in portable systems. |
| Switching Frequency | 1.4MHz (typ), 1.0–1.7MHz sync range - enables use of compact 4.7μH inductors and ceramic output capacitors (e.g., 22μF X5R). |
| Quiescent Current | 10μA in Burst Mode™ - extends battery runtime in always-on sensor nodes and low-duty-cycle IoT endpoints. |
| Feedback Reference | 0.8V ±2% - allows precise output programming down to 0.8V (e.g., 1.2V, 1.8V, 3.3V) using standard resistor dividers. |
| Operating Temp Range | –55°C to +125°C - qualified for automotive under-hood, industrial motor control, and aerospace avionics applications. |
| Shutdown Current | <1μA - ensures minimal battery drain during system sleep or power-off states. |
| Efficiency | Up to 95% at mid-load - achieved via synchronous rectification, low RDS(ON) switches, and optimized gate drive timing. |
Pinout & Package
Package: 8-lead MSOP (3mm × 3mm, 0.65mm pitch), thermally enhanced with exposed pad (requires solder connection to GND plane for optimal thermal performance and EMI reduction).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RUN (Pin 1) | Enable/disable control input | Pull below 0.4V to enter shutdown (<1μA IQ); pull above 1.2V to enable regulation; must not float. |
| ITH (Pin 2) | Error amplifier output / current limit threshold | Voltage sets peak inductor current; nominal 0.5V–1.9V range; used for loop compensation and soft-start. |
| VFB (Pin 3) | Feedback input | Compares output voltage (via resistive divider) against 0.8V internal reference; high-impedance (4–30nA bias). |
| GND (Pin 4) | Power and signal ground | Common return for VIN, SW, RUN, ITH, VFB, SYNC/MODE, PLL LPF; requires low-inductance connection to thermal pad. |
| SW (Pin 5) | Switch node | Connects to inductor; carries high di/dt square-wave current; critical for EMI layout and snubber design. |
| VIN (Pin 6) | Main input supply | Accepts 2.65V–6V; requires local 10μF ceramic decoupling directly to GND (Pin 4) to minimize AC impedance. |
| SYNC/MODE (Pin 7) | Sync clock input / mode select | Tie to VIN for Burst Mode™; ground for pulse-skipping; apply 1–1.7MHz clock for synchronization; no floating allowed. |
| PLL LPF (Pin 8) | Phase detector output / VCO control | Drives external RC filter (e.g., 10kΩ + 2200pF) to set synchronized frequency; open when unused. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous rectification | Integrated P- and N-channel MOSFETs eliminate external Schottky diode, reducing BOM count and improving efficiency by ~5–8% at medium loads. |
| 100% duty cycle operation | Enables dropout mode when VIN approaches VOUT, sustaining regulation down to VIN = VOUT + IOUT × RDS(ON)_PCH (e.g., ~1.5V out at 2.0V in). |
| Burst Mode™ operation | Reduces IQ to 10μA at light loads while maintaining tight output regulation; disables automatically during frequency sync to prevent low-frequency ripple. |
| Overvoltage lockout (OVL) | Triggers at VOVL = VFB + 20–110mV, protecting downstream circuitry from transient overshoot exceeding 6.25% of nominal output. |
| Thermal shutdown & overcurrent protection | Internal circuitry disables switching if junction temperature exceeds 125°C or peak inductor current exceeds safe limits, preventing device damage. |
| Low-noise pulse-skipping mode | Selected by grounding SYNC/MODE; maintains constant-frequency PWM at >50mA load, minimizing audible noise and RF interference in audio-sensitive designs. |
Applications
| Portable Medical Sensors | Automotive Body Control Modules |
|---|---|
Use Scenario: Continuous glucose monitor (CGM) with Bluetooth LE radio and analog biosensor front-end operating from coin-cell or Li-ion battery. IC Role / Device Role / Timing Role: Primary step-down regulator supplying 1.8V to MCU and 3.3V to BLE transceiver, dynamically adjusting between Burst Mode™ and PWM based on transmission duty cycle. Use Value: 10μA quiescent current extends battery life beyond 6 months; 1.4MHz switching avoids AM radio band interference; MSOP-8 footprint fits within 12mm² board area. | Use Scenario: Door module controlling window lift, mirror adjustment, and interior lighting in passenger vehicles with ambient temperature ranging from –40°C to +105°C. IC Role / Device Role / Timing Role: Local power supply converting 12V battery to 5V/3.3V rails for microcontroller, CAN transceiver, and driver ICs. Use Value: –55°C to +125°C rating ensures reliable startup at extreme cold cranking; 6V max input withstands load-dump transients up to 60V with external TVS; internal OVP protects against alternator overvoltage. |
| Industrial Wireless Sensor Nodes | Aerospace Data Acquisition Units |
Use Scenario: Battery-powered vibration sensor node transmitting FFT data via LoRaWAN every 5 minutes in factory-floor environments. IC Role / Device Role / Timing Role: Efficient power converter delivering 3.3V to ultra-low-power MCU and RF SoC, entering deep-sleep state between transmissions. Use Value: <1μA shutdown current minimizes self-discharge; 0.8V reference enables precise 2.5V ADC reference generation; MSOP thermal pad improves reliability in sealed enclosures. | Use Scenario: Flight-critical pressure/temperature telemetry unit mounted near engine bay, requiring radiation-tolerant, high-reliability DC-DC conversion. IC Role / Device Role / Timing Role: Regulated 2.5V supply for precision SAR ADC and isolated SPI interface, operating continuously across wide thermal cycling. Use Value: Extended temperature qualification (–55°C/+125°C) meets MIL-STD-883 Class B requirements; no external diode reduces single-point failure risk; 125°C junction limit enables derated operation at 105°C ambient. |
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, –40°C to +125°C; lacks Burst Mode™, uses different control scheme (D-CAP2). | Better suited for higher-current, wider-input applications; less efficient below 10mA due to higher IQ (19μA). | Select when input exceeds 6V or output current >600mA is required; verify loop stability with ceramic output caps. |
| MAX17503GCU+T | 4.5–60V input, 2.5A output, adjustable frequency (200kHz–2.2MHz), –40°C to +125°C; includes PMBus interface and comprehensive fault reporting. | Targeted at industrial/high-voltage systems; overkill for low-voltage portable designs due to larger package and complexity. | Choose for 24V/48V distributed power or when digital monitoring and sequencing are mandatory. |
Compared with TPS62130ARGTR and MAX17503GCU+T, the LTC3404MPMS8#PBF offers superior light-load efficiency via Burst Mode™ and tighter output accuracy (±2%) but is limited to 6V input and 600mA output-making it optimal for compact, battery-centric designs where ultra-low IQ and small size are primary constraints.
Availability
LTC3404MPMS8#PBF is available at Aetrix Electronics and suitable for portable medical sensors, automotive body control modules, industrial wireless sensor nodes, and aerospace data acquisition units requiring stable component supply across extended temperature ranges.
Supply support for LTC3404MPMS8#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, Inc. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, formed through the acquisition of Linear Technology in 2017.
The LTC3404MPMS8#PBF belongs to ADI's Power by Linear™ portfolio of high-efficiency DC-DC converters, engineered specifically for battery-powered portable and harsh-environment applications demanding ultra-low quiescent current, wide temperature operation, and minimal external components.
FAQ
What is the maximum output current capability of the LTC3404MPMS8#PBF at 3.3V input?
The LTC3404MPMS8#PBF delivers up to 600mA continuous output current when VIN = 3.3V and VOUT = 3.3V, as specified in the datasheet's Electrical Characteristics table and confirmed by Figure 1 (Maximum Output Current vs Input Voltage). This rating assumes proper thermal management via the exposed pad and ambient temperature ≤85°C; derating applies at higher temperatures or lower input voltages.
Does the LTC3404MPMS8#PBF require an external Schottky diode?
No, the LTC3404MPMS8#PBF does not require an external Schottky diode because it integrates both a P-channel main switch and an N-channel synchronous rectifier. This synchronous architecture eliminates conduction losses associated with external diodes and improves full-load efficiency by approximately 5–8%, as documented in the Typical Performance Characteristics section.
How does Burst Mode™ operation affect output voltage ripple in the LTC3404MPMS8#PBF?
In Burst Mode™ operation, the LTC3404MPMS8#PBF reduces switching activity at light loads, causing periodic bursts of switching cycles followed by idle periods. This results in higher low-frequency output voltage ripple (typically ~10–20mVpp) compared to continuous PWM mode. However, the ripple remains tightly regulated within ±2% due to the 0.8V reference and error amplifier servo loop, as shown in Figure G02 and G03.
Can the LTC3404MPMS8#PBF be synchronized to an external clock source?
Yes, the LTC3404MPMS8#PBF supports external frequency synchronization via the SYNC/MODE pin (Pin 7), accepting clock signals from 1.0MHz to 1.7MHz. When synchronized, the internal PLL locks the top MOSFET turn-on edge to the rising edge of the external clock, and Burst Mode™ is automatically disabled to maintain constant-frequency PWM operation, as detailed in the Phase-Locked Loop section.
What is the purpose of the PLL LPF pin on the LTC3404MPMS8#PBF?
The PLL LPF pin (Pin 8) serves as the output of the phase detector and control input to the voltage-controlled oscillator (VCO) in the internal PLL. When synchronizing to an external clock, an RC low-pass filter (e.g., 10kΩ + 2200pF) must be connected from this pin to GND to smooth phase error current and stabilize the VCO frequency; if unused, the pin may be left open.
LTC3404MPMS8#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tube
- 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#PBF FAQ
1.How can I place an order for LTC3404MPMS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3404MPMS8#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 LTC3404MPMS8#PBF reliable?
The price and inventory of LTC3404MPMS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3404MPMS8#PBF is usually 5 days.
3.What payment methods are accepted for LTC3404MPMS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3404MPMS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3404MPMS8#PBF?
LTC3404MPMS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3404MPMS8#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 LTC3404MPMS8#PBF?
For technical support, including LTC3404MPMS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3404MPMS8#PBF requirements.
6.How does Aetrix verify that LTC3404MPMS8#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3404MPMS8#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 LTC3404MPMS8#PBF meets industry standards.
7.What is the process for return or replacement of LTC3404MPMS8#PBF?
All LTC3404MPMS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3404MPMS8#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 LTC3404MPMS8#PBF part is unused and in its original packaging.
Return procedure for LTC3404MPMS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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