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Analog Devices Inc. LTC3404EMS8#PBF
- Part No.:
- LTC3404EMS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC3404EMS8#PBF.pdf
- Description:
- IC REG BUCK ADJ 600MA 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:184
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Product details
Overview
LTC3404EMS8#PBF 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 VIN = 3.3V, operates from 2.65V to 6V input, achieves up to 95% efficiency, and features 1.4MHz fixed switching frequency with external synchronization capability (1–1.7MHz).
For engineers reviewing the LTC3404EMS8#PBF datasheet, LTC3404EMS8#PBF pinout, LTC3404EMS8#PBF application, or LTC3404EMS8#PBF equivalent, key selection considerations include its 10μA quiescent current in Burst Mode operation, 0.8V feedback reference enabling low-output-voltage designs (e.g., 1.5V, 1.8V), integrated P- and N-channel MOSFETs eliminating external Schottky diodes, and 100% duty-cycle low-dropout capability extending battery runtime.
Technical Context
The LTC3404EMS8#PBF implements a constant-frequency, current-mode buck architecture with internal P-channel high-side and N-channel synchronous rectifier switches. Its peak-current control loop uses the ITH pin voltage to set inductor peak current, while VFB compares output voltage against a precise 0.8V reference.
It supports dual operating modes: selectable Burst Mode (≤10μA IQ) for ultra-low-load efficiency or pulse-skipping PWM for reduced output ripple; external synchronization via SYNC/MODE pin disables Burst Mode and locks switching to 1–1.7MHz; and built-in overcurrent, overtemperature, and overvoltage lockout ensure robust protection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.65V to 6V - supports single-cell Li-Ion (2.7–4.2V) and regulated 3.3V/5V rails without derating. |
| Output Current | 600mA at VIN = 3.3V - sufficient for powering core logic, RF transceivers, or sensor subsystems in portable devices. |
| Switching Frequency | 1.4MHz (typ), synchronizable 1–1.7MHz - enables use of compact 4.7μH inductors and ceramic capacitors, minimizing board area. |
| Quiescent Current | 10μA in Burst Mode - extends battery life in standby or intermittent-use applications like wireless modems. |
| Feedback Reference | 0.8V ±2% - allows precise, low-noise regulation down to 0.8V output using standard resistor dividers. |
| RDS(ON) | P-FET: 0.7Ω, N-FET: 0.8Ω - limits conduction loss at 600mA load, supporting >90% efficiency across mid-load range. |
| Protection Features | Overcurrent, overtemperature, and output overvoltage lockout - prevents damage during fault conditions without external circuitry. |
Pinout & Package
Package: 8-Lead MSOP (3mm × 3mm, 0.65mm pitch), thermally enhanced with exposed pad (GND-connected).
| 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; connects to RC network for loop stability and transient response tuning. |
| VFB (Pin 3) | Feedback Input | Monitors output voltage via resistive divider; referenced to 0.8V internal bandgap for accurate regulation. |
| GND (Pin 4) | Power and Signal Ground | Common return for all internal circuits and external components; requires low-impedance PCB connection. |
| SW (Pin 5) | Switch Node | Connects to inductor; carries high dv/dt switching waveform; critical for EMI layout and thermal management. |
| VIN (Pin 6) | Main Power Input | Supplies internal circuitry and power switches; requires local 10μF ceramic decoupling close to 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 to set oscillator frequency when synchronized; open if unused. |
Key Features
| Feature | Design Value |
|---|---|
| No external Schottky diode required | Integrated synchronous N-channel MOSFET eliminates forward-drop loss and thermal footprint of discrete diode. |
| 100% duty cycle operation | Enables dropout mode when VIN ≈ VOUT, sustaining regulation down to VIN = VOUT + ILOAD×RDS(ON)_P. |
| Selectable Burst Mode or pulse skipping | Burst Mode maximizes light-load efficiency; pulse skipping maintains low ripple and avoids audio-band noise. |
| ±2% output voltage accuracy | Ensures stable supply for precision analog circuits or low-voltage microcontrollers without post-regulation. |
| Internal slope compensation | Prevents subharmonic oscillation above 40% duty cycle, enabling stable operation across full input/output range. |
Applications
| Cellular Telephones | Wireless Modems |
|---|---|
Use Scenario: Powering baseband processor and RF front-end from single Li-Ion cell under dynamic load (e.g., call initiation, data burst). IC Role / Device Role / Timing Role: Primary system buck regulator delivering 1.8V/3.3V with fast load transient response and minimal quiescent drain. Use Value: 10μA Burst Mode IQ extends standby time; 1.4MHz switching minimizes inductor size for thin handset form factors. | Use Scenario: Supplying WLAN/BT SoC and memory in battery-operated DSL/wireless CPE units with intermittent traffic. IC Role / Device Role / Timing Role: High-efficiency point-of-load converter managing variable 10mA–500mA loads while maintaining low EMI. Use Value: Synchronization to system clock (1.2MHz) avoids beat frequencies; integrated MOSFETs reduce BOM count and layout complexity. |
| Portable Instruments | Battery-Powered Equipment |
Use Scenario: Regulating 3.3V for microcontroller, ADC, and display driver in handheld test meters with long shelf life. IC Role / Device Role / Timing Role: Main power IC providing stable, low-noise rail with shutdown control for power cycling. Use Value: <1μA shutdown current preserves battery charge over months; ±2% VOUT accuracy ensures measurement integrity. | Use Scenario: Powering GPS modules, sensors, and BLE radios in asset trackers operating on coin-cell or Li-SOCl₂ batteries. IC Role / Device Role / Timing Role: Ultra-low-IQ buck converter enabling multi-year operation in sleep-active duty cycles. Use Value: 10μA Burst Mode IQ dominates system standby power; 2.65V minimum VIN supports aging battery discharge curves. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62231DRYR | Fixed 3.3V output (non-adjustable); 1.8–6.5V input; 400mA max; 3.6MHz switching; 17μA IQ in DCS-Control™ mode. | Optimized for fixed-output, ultra-small footprint (1.2mm × 1.6mm DRY); lacks SYNC input and adjustable VOUT. | Choose for space-constrained, fixed-VOUT designs where higher switching frequency justifies slightly higher IQ. |
| MAX17503GCU+T | 4.5–60V input; 2A output; external MOSFETs; 100kHz–2.2MHz programmable frequency; 100μA IQ. | Targets wide-input industrial/battery systems; requires external FETs and compensation; no Burst Mode. | Choose for high-input-voltage or higher-current needs where design flexibility outweighs integration and ultra-low IQ. |
Compared with TPS62231DRYR and MAX17503GCU+T, the LTC3404EMS8#PBF uniquely balances ultra-low 10μA IQ, adjustable output (0.8V–6V), integrated FETs, and 1–1.7MHz synchronization-making it optimal for Li-Ion portable systems demanding both battery longevity and EMI control.
Availability
LTC3404EMS8#PBF is available at Aetrix Electronics and suitable for cellular telephones, wireless modems, and portable instruments requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for LTC3404EMS8#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. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors.
The LTC3404EMS8#PBF belongs to Linear's legacy µPower synchronous buck regulator family, engineered specifically for energy-constrained portable electronics where battery life, small size, and low-noise operation are critical.
FAQ
What is the minimum input voltage supported by the LTC3404EMS8#PBF?
The LTC3404EMS8#PBF 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 VIN, maximum output current is reduced per Figure 1 in the datasheet, and RDS(ON) of the P-channel switch increases-requiring thermal verification for 100% duty-cycle operation. The LTC3404EMS8#PBF maintains regulation down to VIN = VOUT + ILOAD×RDS(ON)_P due to its 100% duty-cycle capability.
How do I configure the LTC3404EMS8#PBF for Burst Mode operation?
To enable Burst Mode operation on the LTC3404EMS8#PBF, connect the SYNC/MODE pin (Pin 7) directly to VIN. This sets the pin voltage above 1.5V, activating low-IQ intermittent switching. In Burst Mode, the LTC3404EMS8#PBF draws only 10μA quiescent current and maintains high efficiency at light loads (<50mA), though output ripple increases. Do not leave SYNC/MODE floating-tie to VIN for Burst Mode or to GND for pulse-skipping mode.
Can the LTC3404EMS8#PBF be synchronized to an external clock, and what is the valid frequency range?
Yes, the LTC3404EMS8#PBF supports external frequency synchronization via the SYNC/MODE pin (Pin 7) over 1.0MHz to 1.7MHz. When an external clock within this range is applied, the internal PLL locks to its rising edge, aligning the top MOSFET turn-on. Synchronization disables Burst Mode, forcing pulse-skipping operation. Note that synchronization is inhibited if VFB falls below 0.6V (e.g., during short-circuit foldback), ensuring protection integrity remains active.
What is the purpose of the ITH pin on the LTC3404EMS8#PBF, and how is it used?
On the LTC3404EMS8#PBF, the ITH pin (Pin 2) is the error amplifier output and peak current threshold control node. Its voltage directly sets the inductor peak current limit-higher ITH increases peak current, lower ITH reduces it. For stable operation, an RC compensation network (e.g., 100kΩ + 1nF) is connected from ITH to GND to shape the control loop response. During Burst Mode, ITH is disconnected and clamped near 0.7V; in pulse-skipping mode, it remains active for continuous current-mode control. The LTC3404EMS8#PBF datasheet provides detailed compensation guidelines.
Does the LTC3404EMS8#PBF require an external Schottky diode?
No, the LTC3404EMS8#PBF does not require an external Schottky diode. It integrates both a P-channel high-side main switch and an N-channel synchronous rectifier switch, eliminating the forward voltage drop and associated power loss of a discrete diode. This integration improves efficiency-especially at low output voltages-and reduces solution size and component count. The LTC3404EMS8#PBF's synchronous architecture is fully self-contained, requiring only an inductor, input/output capacitors, and feedback resistors for basic operation.
LTC3404EMS8#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
LTC3404EMS8#PBF FAQ
1.How can I place an order for LTC3404EMS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3404EMS8#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 LTC3404EMS8#PBF reliable?
The price and inventory of LTC3404EMS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3404EMS8#PBF is usually 5 days.
3.What payment methods are accepted for LTC3404EMS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3404EMS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3404EMS8#PBF?
LTC3404EMS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3404EMS8#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 LTC3404EMS8#PBF?
For technical support, including LTC3404EMS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3404EMS8#PBF requirements.
6.How does Aetrix verify that LTC3404EMS8#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3404EMS8#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 LTC3404EMS8#PBF meets industry standards.
7.What is the process for return or replacement of LTC3404EMS8#PBF?
All LTC3404EMS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3404EMS8#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 LTC3404EMS8#PBF part is unused and in its original packaging.
Return procedure for LTC3404EMS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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