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Analog Devices Inc. LTC3404IMS8#PBF
- Part No.:
- LTC3404IMS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC3404IMS8#PBF.pdf
- Description:
- IC REG BUCK ADJ 600MA 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:334
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Product details
Overview
LTC3404IMS8#PBF from Analog Devices (formerly Linear Technology) is a high-efficiency monolithic synchronous step-down DC/DC regulator with current-mode control, designed for single Li-Ion battery-powered systems. It delivers up to 600mA output current at 3.3V input, operates from 2.65V to 6V, achieves up to 95% efficiency, and features 1.4MHz fixed switching frequency with external synchronization capability (1–1.7MHz). Its 0.8V reference enables low-output-voltage regulation in portable instrumentation.
For engineers reviewing the LTC3404IMS8#PBF datasheet, LTC3404IMS8#PBF pinout, LTC3404IMS8#PBF application, or LTC3404IMS8#PBF equivalent, key selection criteria include quiescent current (10μA in Burst Mode), 100% duty-cycle dropout operation, internal P/N-channel MOSFETs eliminating external Schottky diodes, ±2% output voltage accuracy, and MSOP-8 package compatibility with space-constrained PCB layouts.
Technical Context
The LTC3404IMS8#PBF implements a constant-frequency, current-mode buck architecture with integrated 0.5Ω P-channel main switch and 0.6Ω N-channel synchronous rectifier. Its error amplifier drives the ITH pin to regulate peak inductor current, while the 0.8V feedback reference enables precise output voltage setting via external resistor divider.
It supports dual operating modes: selectable Burst Mode (10μA IQ) for ultra-low-load efficiency or pulse-skipping PWM for reduced output ripple; mode selection is controlled by the SYNC/MODE pin. Frequency synchronization uses an internal PLL with phase detector output on PLL LPF pin, supporting lock-in across 1–1.7MHz with ±300kHz capture range.
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 full discharge and charging transients. |
| Output Current | 600mA at VIN = 3.3V - sufficient for powering RF modems, microcontrollers, and sensor subsystems without external boost. |
| Switching Frequency | 1.4MHz typical (1–1.7MHz syncable) - enables use of compact 4.7μH inductors and ceramic capacitors, minimizing board area. |
| Quiescent Current | 10μA in Burst Mode - extends battery runtime in always-on, low-duty-cycle applications like wireless sensors. |
| Feedback Reference | 0.8V ±2% - allows stable 1.5V, 1.8V, 2.5V, or 3.3V outputs using standard resistor ratios; supports remote sensing. |
| Duty Cycle | 100% - maintains regulation down to VOUT + RDS(ON) × IOUT, critical for maintaining system operation near battery EOD. |
| Protection | Overcurrent, overtemperature, and output overvoltage lockout (20–110mV above VFB) - ensures robustness in unattended portable deployments. |
Pinout & Package
The LTC3404IMS8#PBF is housed in an 8-lead MSOP package (3mm × 3mm, 0.65mm pitch) with exposed pad for thermal enhancement. Pin 1 is RUN; pin 4 is GND; pin 5 is SW (switch node); pin 6 is VIN; pin 7 is SYNC/MODE; pin 8 is PLL LPF. The package is RoHS-compliant and lead-free (#PBF).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RUN (Pin 1) | Enable/disable control input | Pull below 0.4V to shut down (<1μA IQ); pull above 1.2V to enable; floating not allowed. |
| ITH (Pin 2) | Error amplifier compensation node | Controls peak inductor current threshold; voltage range 0.5–1.9V determines loop gain and transient response. |
| VFB (Pin 3) | Feedback input | Compares divided output voltage against 0.8V reference; sets regulation point and enables remote sensing. |
| GND (Pin 4) | Power and signal ground | Common return for VIN, SW, and internal circuitry; must be low-impedance connection to minimize noise coupling. |
| SW (Pin 5) | Internal switch node | Connects to drains of integrated P- and N-channel MOSFETs; requires low-inductance path to inductor and input/output caps. |
| VIN (Pin 6) | Main power input | Supplies internal circuitry and high-side switch; requires local 10μF ceramic decoupling to GND (Pin 4). |
| SYNC/MODE (Pin 7) | Mode select & sync input | Tie to VIN for Burst Mode; ground for pulse skipping; apply 1–1.7MHz clock for synchronization. |
| PLL LPF (Pin 8) | Phase detector filter output | Drives external RC network (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 rectifier eliminates conduction loss and thermal footprint of discrete diode. |
| 100% duty cycle operation | Enables regulation down to VOUT ≈ VIN − (RDS(ON)_PCH × IOUT), extending usable battery range by ~150mV at 500mA. |
| Selectable Burst Mode or pulse skipping | Burst Mode reduces IQ to 10μA at light loads; pulse skipping maintains low ripple for audio-sensitive circuits. |
| External frequency synchronization | PLL-based sync (1–1.7MHz) prevents beat frequencies in multi-rail systems and enables deterministic EMI shaping. |
| Overvoltage lockout protection | Triggers shutdown if VOUT exceeds VFB by 20–110mV, preventing damage to downstream 1.8V/2.5V logic during startup or fault conditions. |
Applications
| Cellular Telephones | Wireless Modems |
|---|---|
Use Scenario: Powering baseband processor and RF transceiver in GSM/UMTS handsets with single Li-ion cell. IC Role / Device Role / Timing Role: Primary step-down regulator delivering 1.8V core and 2.8V I/O rails from 3.0–4.2V battery. Use Value: 95% peak efficiency and 10μA Burst Mode IQ extend talk time by >20% versus legacy asynchronous buck converters. | Use Scenario: Supplying LTE/Wi-Fi SoC and memory interface in portable hotspot devices. IC Role / Device Role / Timing Role: High-frequency (1.4MHz) buck converter enabling compact 2-layer PCB layout with minimal EMI filtering. Use Value: Synchronization capability aligns switching edges with host SoC clock domain, reducing conducted emissions by 8–10dB. |
| Portable Instruments | Battery-Powered Equipment |
Use Scenario: Regulating power for precision ADCs, op-amps, and display drivers in handheld multimeters and data loggers. IC Role / Device Role / Timing Role: Low-noise, low-ripple power source with remote sensing to maintain ±0.5% output accuracy under load variation. Use Value: Pulse skipping mode suppresses sub-audio ripple (<20kHz), preventing interference with sensitive analog front-ends. | Use Scenario: Providing stable 3.3V rail for MCU, BLE radio, and sensors in asset trackers and smart tags. IC Role / Device Role / Timing Role: Ultra-low-quiescent-current buck regulator supporting 10-year battery life in deep-sleep monitoring cycles. Use Value: 100% duty cycle operation sustains regulation until battery reaches 3.0V, maximizing usable capacity from Li-SOCl₂ or Li-MnO₂ cells. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62231DRVR | 3MHz fixed frequency, 400mA max output, 17μA IQ in DCS-Control™ mode; no SYNC pin or 100% duty cycle. | Better suited for ultra-compact designs needing higher fSW; less suitable for low-VIN dropout-critical systems. | Choose TPS62231DRVR when board space is constrained and 3.3V@400mA suffices; avoid when VOUT must track falling battery below 3.1V. |
| MAX17503GCU+T | 4.5–60V input, 1.2A output, external MOSFETs; includes PMBus interface and comprehensive telemetry. | Targeted at industrial/high-VIN applications; lacks integrated switches and ultra-low-IQ modes. | Choose MAX17503GCU+T for wide-input, high-reliability systems requiring digital configuration; not a functional substitute for Li-ion portable use. |
Compared with TPS62231DRVR and MAX17503GCU+T, the LTC3404IMS8#PBF uniquely balances ultra-low quiescent current (10μA), 100% duty cycle, and integrated synchronous switches in an MSOP-8 package-making it optimal for space- and battery-life-constrained single-cell applications where neither high-frequency miniaturization nor wide-input flexibility is required.
Availability
LTC3404IMS8#PBF is available at Aetrix Electronics and suitable for cellular telephones, wireless modems, portable instruments, and battery-powered equipment requiring stable component supply with guaranteed long-term availability.
Supply support for LTC3404IMS8#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 automotive and industrial qualification standards.
The LTC3404IMS8#PBF belongs to Linear's monolithic synchronous buck regulator family, engineered specifically for high-efficiency, low-IQ power conversion in portable Li-ion-powered systems with stringent size and thermal constraints.
FAQ
What is the maximum output current capability of the LTC3404IMS8#PBF at 3.3V input?
The LTC3404IMS8#PBF delivers up to 600mA output current when VIN = 3.3V and VOUT = 3.3V (100% duty cycle), per the datasheet's Figure 1 and Electrical Characteristics table. At lower input voltages (e.g., 2.65V), maximum output current drops to ~400mA due to increased RDS(ON) and thermal limits. Derating is required above 85°C ambient per the θJA = 125°C/W specification.
Does the LTC3404IMS8#PBF support true 100% duty cycle operation, and how does it behave near dropout?
Yes, the LTC3404IMS8#PBF supports true 100% duty cycle operation. When VIN approaches VOUT, the controller holds the P-channel MOSFET continuously on, regulating output as VOUT = VIN − (RDS(ON)_PCH × IOUT). This extends usable battery life in portable systems, allowing operation down to ~3.0V for a 2.8V rail at 500mA - confirmed by the "Dropout Operation" section and Figure 1 in the datasheet.
How is Burst Mode operation enabled or disabled on the LTC3404IMS8#PBF?
Burst Mode is enabled by connecting the SYNC/MODE pin (Pin 7) to VIN; it is disabled (reverting to pulse-skipping PWM) by grounding SYNC/MODE. During Burst Mode, the IC cycles between active regulation and sleep states, achieving 10μA quiescent current. The datasheet explicitly states that Burst Mode is inhibited during external synchronization or when SYNC/MODE is pulled low.
What are the absolute maximum ratings for the SW pin of the LTC3404IMS8#PBF?
The SW pin of the LTC3404IMS8#PBF has an absolute maximum rating of –0.3V to (VIN + 0.3V) DC, with peak SW sink/source current limited to 1.5A. This reflects the voltage stress across the internal P- and N-channel MOSFETs during switching transitions. Exceeding these limits risks latch-up or permanent damage, as noted in the Absolute Maximum Ratings table on page 2 of the datasheet.
Can the LTC3404IMS8#PBF be synchronized to an external clock, and what is the valid frequency range?
Yes, the LTC3404IMS8#PBF supports external synchronization via the SYNC/MODE pin (Pin 7) over 1.0MHz to 1.7MHz. The internal PLL achieves lock with ±300kHz capture range, and the relationship between PLL LPF pin voltage and frequency is linear (1.0–1.7MHz ↔ 0.4–2.0V), per Figure 4 and the "Frequency Synchronization" section. Synchronization disables Burst Mode and forces pulse-skipping operation.
LTC3404IMS8#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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-MSOP
LTC3404IMS8#PBF FAQ
1.How can I place an order for LTC3404IMS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3404IMS8#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 LTC3404IMS8#PBF reliable?
The price and inventory of LTC3404IMS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3404IMS8#PBF is usually 5 days.
3.What payment methods are accepted for LTC3404IMS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3404IMS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3404IMS8#PBF?
LTC3404IMS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3404IMS8#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 LTC3404IMS8#PBF?
For technical support, including LTC3404IMS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3404IMS8#PBF requirements.
6.How does Aetrix verify that LTC3404IMS8#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3404IMS8#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 LTC3404IMS8#PBF meets industry standards.
7.What is the process for return or replacement of LTC3404IMS8#PBF?
All LTC3404IMS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3404IMS8#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 LTC3404IMS8#PBF part is unused and in its original packaging.
Return procedure for LTC3404IMS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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