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Analog Devices Inc. LTC3404EMS8#TRPBF
- Part No.:
- LTC3404EMS8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC3404EMS8#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 600MA 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:10,003
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Product details
Overview
LTC3404EMS8#TRPBF from Analog Devices (formerly Linear Technology) is a 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 LTC3404EMS8#TRPBF datasheet, LTC3404EMS8#TRPBF pinout, LTC3404EMS8#TRPBF application, or LTC3404EMS8#TRPBF equivalent, key selection considerations 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 thermal performance (θJA = 125°C/W).
Technical Context
The LTC3404EMS8#TRPBF implements constant-frequency current-mode control with integrated P-channel high-side and N-channel synchronous rectifier MOSFETs (RDS(ON) = 0.7Ω / 0.8Ω at 100mA). Its error amplifier drives the ITH pin to regulate peak inductor current, while slope compensation prevents subharmonic oscillation above 40% duty cycle.
Burst Mode operation reduces quiescent current to 10μA by intermittently enabling the power stage when load demand drops below ~250mA peak inductor current; pulse skipping mode remains active during external synchronization (1–1.7MHz) to suppress low-frequency audio interference. Overvoltage lockout (ΔVOVL = 20–110mV above VFB) and thermal shutdown protect against fault conditions.
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 baseband processors, RF front-ends, and sensor subsystems in handheld devices. |
| Switching Frequency | 1.4MHz (typ), synchronizable 1–1.7MHz - 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 standby or low-duty-cycle sensing applications. |
| Feedback Reference | 0.8V ±2% - allows precise regulation of outputs as low as 0.8V using standard resistor dividers (e.g., 1.5V, 1.8V, 2.5V, 3.3V). |
| Shutdown Current | <1μA - ensures negligible battery drain during system sleep or power-off states. |
| Efficiency | Up to 95% - minimizes thermal stress and extends operating time in space-constrained portable designs. |
| Duty Cycle | 100% - maintains regulation down to VIN ≈ VOUT, critical for end-of-battery-life operation in Li-ion systems. |
Pinout & Package
Package: 8-lead MSOP (3mm × 3mm, 0.65mm pitch), θJA = 125°C/W, rated for –40°C to 85°C (E-grade).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RUN (Pin 1) | Enable/disable control input | Pull <0.4V to shut down (IQ <1μA); pull >1.2V to enable; must not float. |
| ITH (Pin 2) | Error amplifier output / current limit threshold | Voltage sets peak inductor current; nominal range 0.5–1.9V; used for loop compensation. |
| VFB (Pin 3) | Feedback input | Compares output voltage (via resistive divider) to 0.8V reference; determines regulation accuracy. |
| GND (Pin 4) | Power and signal ground | Common return for all internal circuitry and external components; requires low-impedance PCB connection. |
| SW (Pin 5) | Switch node | Connects to inductor; carries high di/dt square-wave current; requires tight layout to minimize EMI. |
| VIN (Pin 6) | Main input supply | Accepts 2.65–6V; must be decoupled locally with ≥10μF ceramic capacitor near pin. |
| 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. |
| PLL LPF (Pin 8) | Phase detector output / VCO control | Drives external RC filter (e.g., 10kΩ + 2200pF) when synchronized; open when unused. |
Key Features
| Feature | Design Value |
|---|---|
| No external Schottky diode required | Integrated N-channel synchronous rectifier eliminates conduction loss and board area for discrete diode. |
| 100% duty-cycle low-dropout operation | Maintains regulation when input falls to within RDS(ON) × ILOAD of output voltage, extending usable battery range. |
| 1.4MHz constant-frequency switching | Enables use of small, low-profile 4.7μH shielded inductors and avoids AM radio band interference. |
| Selectable Burst Mode or pulse skipping | Burst Mode maximizes light-load efficiency (10μA IQ); pulse skipping ensures low ripple in noise-sensitive analog/audio circuits. |
| Internal overcurrent and overtemperature protection | Auto-recovering shutdown prevents damage during short-circuit or thermal overload without external circuitry. |
| ±2% output voltage accuracy | Ensures stable power delivery to precision analog ICs, ADCs, and RF synthesizers without post-regulation trimming. |
Applications
| Cellular Telephones | Wireless Modems |
|---|---|
Use Scenario: Powering baseband processor core and I/O rails in GSM/UMTS handsets operating from single Li-ion cell. IC Role / Device Role / Timing Role: Primary buck regulator delivering 1.2V/1.8V/2.8V at up to 600mA with dynamic voltage scaling support. Use Value: 95% peak efficiency and 10μA Burst Mode current extend talk time by >15% versus legacy PWM-only regulators. | Use Scenario: Supplying 3.3V logic and 1.8V RF transceiver in LTE Cat-1 embedded modems. IC Role / Device Role / Timing Role: Synchronous step-down converter with 1.4MHz switching to avoid interference with cellular bands. Use Value: 100% duty-cycle operation sustains regulation down to 2.8V input, supporting full battery discharge without brownout. |
| Portable Instruments | Battery-Powered Equipment |
Use Scenario: Providing stable 1.5V/2.5V bias to precision op-amps and ADCs in handheld multimeters and data loggers. IC Role / Device Role / Timing Role: Low-noise, high-accuracy DC/DC regulator with ±2% output tolerance and low 10μA quiescent current. Use Value: Enables >100-hour battery life on two AA cells while maintaining 16-bit measurement integrity. | Use Scenario: Regulating 3.3V microcontroller and sensor interface rails in wireless IoT nodes powered by coin cells or Li-SOCl₂ batteries. IC Role / Device Role / Timing Role: Ultra-low-IQ buck converter with shutdown current <1μA and programmable output via feedback divider. Use Value: Reduces average system current to <5μA in deep-sleep mode, enabling 5+ year battery life. |
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 switching, 400mA max output, 2.05V–6.5V input, 1.5μA shutdown current | Higher frequency enables smaller passives but lower current rating limits use in higher-power peripherals | Prefer for space-constrained designs needing >2MHz operation and lower IQ in shutdown; not suitable for 600mA loads. |
| MAX17503GCU+T | 4.5V–60V input, 600mA output, external MOSFETs, adjustable frequency (200kHz–2.2MHz) | Wider input range and external FETs suit industrial 12V/24V systems but require more BOM components | Choose for high-input-voltage or high-temp (>85°C) environments; overkill for single-cell Li-ion portable use. |
Compared with TPS62231DRVR and MAX17503GCU+T, the LTC3404EMS8#TRPBF offers optimal balance of 600mA capability, 10μA Burst Mode current, and 2.65V minimum input-making it uniquely suited for Li-ion-powered portable electronics where battery life, size, and low-voltage operation are co-prioritized.
Availability
LTC3404EMS8#TRPBF is available at Aetrix Electronics and suitable for cellular telephones, wireless modems, and portable instrumentation requiring stable component supply with long-term manufacturability and consistent parametric performance.
Supply support for LTC3404EMS8#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 acquired Linear Technology in 2017 and maintains its high-performance power management portfolio with rigorous qualification and long-term product support.
The LTC3404EMS8#TRPBF belongs to Linear's monolithic synchronous buck regulator family, engineered specifically for ultra-low-power, single-cell Li-ion applications demanding high efficiency across wide load ranges and robust dropout behavior.
FAQ
What is the minimum input voltage supported by the LTC3404EMS8#TRPBF?
The LTC3404EMS8#TRPBF supports a minimum input voltage of 2.65V, enabling reliable operation across the full discharge curve of a single Li-ion cell (2.7V–4.2V). At this low input, maximum output current is reduced per Figure 1 in the datasheet, and RDS(ON) increases-requiring careful thermal design when operating near 100% duty cycle.
How does Burst Mode operation improve battery life in the LTC3404EMS8#TRPBF?
Burst Mode operation reduces the LTC3404EMS8#TRPBF's quiescent current to just 10μA by disabling the power stage between energy bursts when load demand is low. This dramatically lowers no-load power consumption compared to continuous PWM, extending battery runtime in standby or intermittent-sensing applications such as IoT sensors and portable medical devices.
Can the LTC3404EMS8#TRPBF be synchronized to an external clock, and what is the valid frequency range?
Yes, the LTC3404EMS8#TRPBF can be synchronized via its SYNC/MODE pin (Pin 7) to an external clock source ranging from 1MHz to 1.7MHz. During synchronization, Burst Mode is automatically disabled and the device operates in pulse skipping mode to prevent low-frequency ripple from interfering with sensitive analog or audio circuitry.
What is the purpose of the PLL LPF pin (Pin 8) on the LTC3404EMS8#TRPBF?
The PLL LPF pin (Pin 8) on the LTC3404EMS8#TRPBF serves as the phase detector output and voltage-controlled oscillator (VCO) control node. When externally synchronized, it drives an external RC filter (e.g., 10kΩ + 2200pF) to stabilize the internal oscillator frequency; when unused, this pin may be left open without affecting operation.
Does the LTC3404EMS8#TRPBF require an external Schottky diode?
No, the LTC3404EMS8#TRPBF does not require an external Schottky diode because it integrates both a P-channel high-side switch and an N-channel synchronous rectifier. This internal synchronous architecture eliminates forward-voltage drop losses and simplifies PCB layout-reducing component count, cost, and board area versus asynchronous buck converters.
LTC3404EMS8#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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-MSOP
LTC3404EMS8#TRPBF FAQ
1.How can I place an order for LTC3404EMS8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3404EMS8#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 LTC3404EMS8#TRPBF reliable?
The price and inventory of LTC3404EMS8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3404EMS8#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3404EMS8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3404EMS8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3404EMS8#TRPBF?
LTC3404EMS8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3404EMS8#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 LTC3404EMS8#TRPBF?
For technical support, including LTC3404EMS8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3404EMS8#TRPBF requirements.
6.How does Aetrix verify that LTC3404EMS8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3404EMS8#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 LTC3404EMS8#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3404EMS8#TRPBF?
All LTC3404EMS8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3404EMS8#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 LTC3404EMS8#TRPBF part is unused and in its original packaging.
Return procedure for LTC3404EMS8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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