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Analog Devices Inc. LTC3404IMS8#TRPBF
- Part No.:
- LTC3404IMS8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC3404IMS8#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 600MA 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,981
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Product details
Overview
LTC3404IMS8#TRPBF from Analog Devices (formerly Linear Technology) is a high-efficiency monolithic synchronous buck regulator with current-mode control, 1.4MHz fixed switching frequency, 2.65V–6V input range, and 600mA output capability at 3.3V input. It delivers ±2% output voltage accuracy using a 0.8V internal reference and supports low-dropout operation via 100% duty cycle-ideal for single Li-Ion battery-powered portable instruments and wireless modems.
For engineers reviewing the LTC3404IMS8#TRPBF datasheet, LTC3404IMS8#TRPBF pinout, LTC3404IMS8#TRPBF application, or LTC3404IMS8#TRPBF equivalent, key selection criteria include quiescent current (10μA in Burst Mode), synchronization range (1MHz–1.7MHz), RDS(ON) of integrated P- and N-channel MOSFETs (0.7Ω / 0.8Ω), thermal performance in MS8 package (θJA = 125°C/W), and mode-select behavior of SYNC/MODE pin.
Technical Context
The LTC3404IMS8#TRPBF implements a constant-frequency, current-mode synchronous buck architecture with internal 0.7Ω P-channel high-side and 0.8Ω N-channel low-side 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 uses an edge-sensitive digital phase detector and external RC filter on PLL LPF (Pin 8) to lock the VCO (1MHz–1.7MHz) to an external clock applied to SYNC/MODE (Pin 7). Burst Mode disables under synchronization or when SYNC/MODE is pulled low, ensuring clean audio-band operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.65V to 6V - supports single-cell Li-Ion (fully charged to depleted) without external LDO pre-regulation. |
| Output Current | 600mA at VIN = 3.3V - sufficient for baseband processors, RF transceivers, and sensor subsystems in portable equipment. |
| Switching Frequency | 1.4MHz (typ), synchronizable 1MHz–1.7MHz - 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 IoT endpoints. |
| Feedback Reference | 0.8V ±2% - allows precise regulation down to 0.8V output (e.g., core voltage for low-power MCUs) with standard resistor dividers. |
| Shutdown Current | <1μA - meets ultra-low-power system-level sleep requirements in handheld medical or metering devices. |
| RDS(ON) (High-Side) | 0.7Ω (typ) - limits conduction loss at 600mA load to ~252mW, critical for thermal management in MS8 package. |
| Protection Features | Overcurrent, overtemperature, and output overvoltage lockout (ΔVOVL = 20–110mV) - ensures robustness in unattended embedded deployments. |
Pinout & Package
The LTC3404IMS8#TRPBF is housed in an 8-lead MSOP package (3mm × 3mm, 0.65mm pitch) with exposed pad for thermal enhancement (θJA = 125°C/W). Pin 1 is RUN; Pin 4 is GND; Pin 8 is PLL LPF. The package is RoHS-compliant and lead-free (#TRPBF suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RUN (Pin 1) | Enable/disable control input | Pulled high (>1.2V) to enable; pulled low (<0.4V) to enter <1μA shutdown - must not float. |
| ITH (Pin 2) | Error amplifier output / current limit setpoint | Voltage (0.5V–1.9V) sets peak inductor current; used for loop compensation and current limiting. |
| VFB (Pin 3) | Feedback node for output voltage sensing | Compares against 0.8V reference; connects to resistive divider from VOUT - enables remote sensing. |
| GND (Pin 4) | Analog and power ground reference | Common return for feedback, control, and power paths; requires low-impedance PCB connection to minimize noise. |
| SW (Pin 5) | Switch node | Connects to inductor; carries high di/dt square-wave current - demands tight layout and Kelvin grounding. |
| VIN (Pin 6) | Main input supply | 2.65V–6V input; requires local 10μF ceramic decoupling close to pin and GND. |
| SYNC/MODE (Pin 7) | External clock sync input / mode select | Tied to VIN → Burst Mode; grounded → Pulse Skipping Mode; 1–1.7MHz signal → synchronized PWM. |
| PLL LPF (Pin 8) | Phase detector output / VCO control | Drives external RC filter (e.g., 10kΩ + 2200pF) to stabilize synchronized frequency; left open if 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 as VIN approaches VOUT - extends usable battery voltage range by ~200mV in Li-Ion systems. |
| Selectable Burst Mode or Pulse Skipping | Burst Mode optimizes light-load efficiency (10μA IQ); Pulse Skipping ensures low ripple for noise-sensitive analog/RF stages. |
| Internal slope compensation | Automatically engages above 40% duty cycle to prevent subharmonic instability - no external components needed. |
| Robust protection suite | Thermal shutdown, cycle-by-cycle overcurrent detection, and output overvoltage lockout (20–110mV above VFB) ensure field reliability. |
| MS8 package with exposed thermal pad | Enables 1.25W power dissipation at TA = 85°C - suitable for space-constrained industrial handhelds and test equipment. |
Applications
| Cellular Telephones | Wireless Modems |
|---|---|
Use Scenario: Powering baseband processor and PMIC rails in 3G/4G feature phones with single Li-Ion battery. IC Role / Device Role / Timing Role: Primary step-down regulator delivering 1.8V/3.3V from 3.0–4.2V battery. Use Value: 95% peak efficiency and 10μA Burst Mode IQ extend talk time by >15% versus legacy asynchronous buck converters. | Use Scenario: Supplying RF front-end and DSP in LTE/DSL broadband modems operating from USB or wall adapter. IC Role / Device Role / Timing Role: High-frequency (1.4MHz) buck converter enabling compact 4.7μH inductor and low-profile ceramic capacitors. Use Value: Synchronization capability (1–1.7MHz) avoids beat frequencies with sensitive RF receivers, reducing EMI compliance risk. |
| Portable Instruments | Battery-Powered Equipment |
Use Scenario: Regulating analog sensor bias and microcontroller core voltage in handheld multimeters and gas detectors. IC Role / Device Role / Timing Role: Low-noise, low-quiescent-current DC/DC providing stable 1.2V and 3.3V rails during intermittent measurement cycles. Use Value: ±2% output accuracy and 0.8V reference enable direct generation of precision MCU core voltages without trimming. | Use Scenario: Powering display backlight, touch controller, and BLE SoC in portable medical monitors and asset trackers. IC Role / Device Role / Timing Role: Dual-mode regulator supporting both Burst Mode (for 10μA sleep current) and Pulse Skipping (for clean 3.3V display rail). Use Value: RUN pin control and <1μA shutdown allow full system power gating - meeting IEC 62304 Class B power budget requirements. |
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 | Higher IQ (17μA Burst Mode), lower RDS(ON) (0.35Ω HS), but narrower input range (2.05V–6.5V) and no SYNC input. | Lacks frequency synchronization - unsuitable where EMI coexistence with RF sections is critical. | Choose for cost-sensitive, non-synchronized portable apps needing higher efficiency at medium loads. |
| MAX17503GCU+T | Wider input (4.5V–60V), higher current (1.2A), but larger 16-pin TQFN package and 2.5mA no-load IQ. | Designed for industrial/high-voltage inputs - over-specified for Li-Ion battery systems. | Choose only if future design scaling requires >6V input or >600mA output; otherwise excessive size and IQ penalty. |
Compared with TPS62231DRVR and MAX17503GCU+T, the LTC3404IMS8#TRPBF uniquely balances ultra-low IQ (10μA), synchronization capability, and compact MS8 footprint - making it optimal for space- and battery-life-constrained Li-Ion devices where EMI control matters.
Availability
LTC3404IMS8#TRPBF is available at Aetrix Electronics and suitable for cellular telephones, wireless modems, and portable instruments requiring stable component supply across extended temperature ranges (–40°C to 85°C).
Supply support for LTC3404IMS8#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 LTC3404IMS8#TRPBF belongs to Linear's legacy µPower synchronous buck regulator family, engineered specifically for battery-powered portable electronics demanding high efficiency at light loads and minimal board area.
FAQ
What is the maximum output current capability of the LTC3404IMS8#TRPBF at 3.3V input?
The LTC3404IMS8#TRPBF delivers up to 600mA continuous output current when VIN = 3.3V, as confirmed in the datasheet's "Typical Performance Characteristics" and "Electrical Characteristics" tables. This rating assumes proper thermal management using the MS8 package's exposed pad and ambient temperature ≤85°C. Peak inductor current reaches 1.0A under transient conditions per the IPK specification.
How does the SYNC/MODE pin configure Burst Mode versus Pulse Skipping Mode on the LTC3404IMS8#TRPBF?
On the LTC3404IMS8#TRPBF, tying SYNC/MODE (Pin 7) to VIN enables Burst Mode operation (10μA IQ), while grounding it selects Pulse Skipping Mode (700μA IQ). Burst Mode is automatically disabled during external synchronization (1–1.7MHz signal applied), forcing Pulse Skipping Mode to maintain low output ripple. The threshold is VSYNC/MODE rising = 0.3–1.5V per Electrical Characteristics table.
Can the LTC3404IMS8#TRPBF operate with input voltage below 2.65V?
No - the absolute minimum input voltage for functional operation of the LTC3404IMS8#TRPBF is 2.65V, as specified in Absolute Maximum Ratings and Electrical Characteristics. Operation below this level risks failure to start or erratic regulation. The device supports dropout down to VOUT + (IOUT × 0.7Ω), but VIN must remain ≥2.65V for bias circuitry and gate drive integrity.
What is the purpose of the PLL LPF pin (Pin 8) on the LTC3404IMS8#TRPBF, and how is it used?
The PLL LPF pin (Pin 8) on the LTC3404IMS8#TRPBF outputs phase detector current to control the internal VCO during synchronization. When externally clocked, a series RC network (e.g., 10kΩ + 2200pF) is connected from PLL LPF to GND to filter this current into a stable DC voltage that sets oscillator frequency between 1MHz and 1.7MHz. If unused, PLL LPF may be left open - no pull-up/down required.
Does the LTC3404IMS8#TRPBF require an external compensation network, and where is it connected?
Yes - the LTC3404IMS8#TRPBF requires external compensation on the ITH pin (Pin 2), which is the output of the internal error amplifier. A Type II or Type III network (typically resistor + capacitor + optional second capacitor) is placed between ITH and GND to stabilize the current-mode control loop. The datasheet's "Applications Information" section provides design equations and example values based on selected inductor and output capacitor.
LTC3404IMS8#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
LTC3404IMS8#TRPBF FAQ
1.How can I place an order for LTC3404IMS8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3404IMS8#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 LTC3404IMS8#TRPBF reliable?
The price and inventory of LTC3404IMS8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3404IMS8#TRPBF is usually 5 days.
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We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3404IMS8#TRPBF transactions.
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LTC3404IMS8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3404IMS8#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 LTC3404IMS8#TRPBF?
For technical support, including LTC3404IMS8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3404IMS8#TRPBF requirements.
6.How does Aetrix verify that LTC3404IMS8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3404IMS8#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 LTC3404IMS8#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3404IMS8#TRPBF?
All LTC3404IMS8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3404IMS8#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 LTC3404IMS8#TRPBF part is unused and in its original packaging.
Return procedure for LTC3404IMS8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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