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Analog Devices Inc. LTC3405ES6#TRMPBF
- Part No.:
- LTC3405ES6#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LTC3405ES6#TRMPBF.pdf
- Description:
- IC REG BUCK ADJ 300MA TSOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:648
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Product details
Overview
LTC3405ES6#TRMPBF from Analog Devices (formerly Linear Technology) is a monolithic synchronous step-down DC/DC converter optimized for single-cell Li-Ion battery-powered portable electronics. It delivers up to 300mA output current with 96% peak efficiency, operates from 2.5V to 5.5V input, uses constant-frequency current-mode control at 1.5MHz, and supports low dropout via 100% duty cycle operation.
For engineers reviewing the LTC3405ES6#TRMPBF datasheet, LTC3405ES6#TRMPBF pinout, LTC3405ES6#TRMPBF application, or LTC3405ES6#TRMPBF equivalent, key selection considerations include its 20µA operating quiescent current, ±2% output voltage accuracy, internal P/N-channel MOSFETs eliminating external Schottky diodes, 0.8V feedback reference enabling sub-1V outputs, and ThinSOT-6 package compatibility with space-constrained handheld designs.
Technical Context
The LTC3405ES6#TRMPBF implements a constant-frequency, current-mode buck architecture with integrated high-side P-channel and low-side N-channel MOSFETs. Its peak inductor current is controlled by the error amplifier output, and slope compensation prevents subharmonic oscillation above 40% duty cycle without reducing maximum peak current - enabled by a proprietary compensation scheme.
It supports two operating modes: Burst Mode (MODE = GND) for ultra-low 20µA quiescent current at light loads, and pulse-skipping mode (MODE = VIN) for lower output ripple. Shutdown draws <1µA, and overtemperature protection disables switching above ~150°C. The 0.8V reference allows precise output programming via external resistor divider.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5V to 5.5V - supports full discharge range of single Li-Ion cells (2.7V–4.2V typical). |
| Output Current | 300mA max at VIN = 3V - sufficient for baseband processors, RF transceivers, and display drivers in portable devices. |
| Switching Frequency | 1.5MHz (typ) - enables use of compact 4.7µH inductors and ceramic capacitors without audible noise. |
| Feedback Reference | 0.8V ±2% - permits accurate output voltages down to 0.8V (e.g., 1.3V, 1.5V, 1.8V) using standard resistor ratios. |
| Quiescent Current | 20µA in operation, <1µA in shutdown - extends battery runtime in standby and sleep states. |
| Efficiency Peak | 96% - achieved at mid-load with 3.6V input and 1.8V output, minimizing thermal stress in thin-profile enclosures. |
| Duty Cycle Range | 0% to 100% - maintains regulation during battery droop; output follows VIN minus RDS(ON) × IOUT in dropout. |
Pinout & Package
Package: TSOT-23-6 (ThinSOT™), 1mm height, 0.95mm pitch, RoHS-compliant, moisture-sensitive level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RUN (Pin 1) | Enable/disable control input | Logic-high (>1.5V) enables regulator; logic-low (<0.3V) forces shutdown with <1µA supply current - must not float. |
| GND (Pin 2) | Power and signal reference | Primary ground return for IC core, power switches, and feedback network - requires low-inductance connection to power plane. |
| SW (Pin 3) | Switch node | Connection point for external inductor; carries high di/dt square-wave voltage (0V to VIN); critical for EMI and layout integrity. |
| VIN (Pin 4) | Main power input | Supplies internal circuitry and power switches; requires local 2.2µF ceramic decoupling directly to GND (Pin 2). |
| VFB (Pin 5) | Feedback input | Monitors resistive divider output; compares to 0.8V reference to regulate VOUT - sensitive to noise; route away from SW. |
| MODE (Pin 6) | Operating mode select | GND selects Burst Mode (low IQ); VIN selects pulse-skipping mode (lower ripple) - must not float. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous rectification | Integrated P- and N-channel MOSFETs eliminate external Schottky diode, increasing efficiency by ~5–10% and reducing BOM count. |
| Burst Mode operation | Maintains 20µA quiescent current across load range 10µA–25mA, optimizing battery life in intermittent-activity devices like remote controls or sensors. |
| 100% duty cycle capability | Enables dropout operation down to VIN ≈ VOUT + (RDS(ON)_P × IOUT), extending usable battery voltage range by ~150mV vs non-dropout regulators. |
| Internal slope compensation | Patent-pending scheme preserves full 625mA peak inductor current capability even at >40% duty cycle - no derating required. |
| Overvoltage lockout | Triggers at VOUT > VFB + 20–80mV, disabling main switch until fault clears - protects downstream 1.8V/2.5V logic from transient overshoot. |
Applications
| Cellular Telephones | Wireless Modems |
|---|---|
Use Scenario: Powering baseband processor core voltage (1.3V) and I/O rail (1.8V) from single Li-Ion cell. IC Role / Device Role / Timing Role: Primary synchronous buck regulator providing tightly regulated, low-noise DC supply with fast load transient response. Use Value: 96% efficiency at 200mA reduces heat in sealed handset enclosures; 20µA IQ extends standby time beyond 7 days. |
Use Scenario: Supplying 3.3V RF front-end and 1.8V digital baseband in 4G/LTE USB dongles. IC Role / Device Role / Timing Role: High-frequency buck converter enabling compact PCB layout with 1.5MHz switching and minimal passive footprint. Use Value: 1.5MHz operation avoids AM radio band interference; Burst Mode cuts idle power to enable always-on connectivity. |
| Digital Still Cameras | Portable Instruments |
Use Scenario: Generating 2.5V sensor bias and 1.5V image processor core supply during burst capture mode. IC Role / Device Role / Timing Role: Efficient step-down regulator supporting rapid load steps (0→300mA in <10µs) with <±25mV output deviation. Use Value: Current-mode control ensures stable loop response under dynamic imaging loads; 100% duty cycle sustains output as battery drops to 2.7V. |
Use Scenario: Powering microcontroller, ADC, and LCD backlight driver in handheld multimeters or gas detectors. IC Role / Device Role / Timing Role: Single-chip power solution replacing discrete buck + LDO combinations to reduce size and cost. Use Value: ±2% output accuracy meets precision analog measurement requirements; ThinSOT-6 fits 8mm × 8mm PCB area constraints. |
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 | Fixed 1.8V output; 2.05V–6.0V input; 400mA rating; 3.6MHz switching; requires external compensation. | Not adjustable - unsuitable for multi-rail systems requiring 1.3V/1.5V/2.5V; higher frequency increases EMI filtering complexity. | Select only if fixed 1.8V output suffices and board space allows smaller inductor; verify stability with ceramic output caps. |
| MAX17222ELT+T | 0.7V–5.5V input; 300mA; 1.2MHz; 1.6µA IQ in shutdown; no MODE pin - auto-burst mode only. | Lacks manual MODE control; lower 1.6µA shutdown current but higher 25µA operating IQ vs LTC3405ES6#TRMPBF's 20µA. | Prefer when absolute lowest shutdown IQ is critical and Burst Mode-only operation is acceptable; verify thermal performance at 300mA. |
Compared with TPS62231DRVR and MAX17222ELT+T, the LTC3405ES6#TRMPBF offers adjustable output via resistor divider, user-selectable Burst/Pulse-Skipping modes, and superior 20µA operating IQ - making it optimal for multi-voltage, battery-sensitive portable designs where flexibility and efficiency balance are essential.
Availability
LTC3405ES6#TRMPBF is available at Aetrix Electronics and suitable for cellular telephones, wireless modems, digital still cameras, and portable instruments requiring stable component supply with guaranteed long-term sourcing and full traceability.
Supply support for LTC3405ES6#TRMPBF 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 LTC3405ES6#TRMPBF belongs to Linear's legacy µPower synchronous buck regulator family, designed specifically for ultra-low-power, space-constrained portable electronics powered by single Li-Ion cells.
FAQ
What is the maximum output current capability of the LTC3405ES6#TRMPBF?
The LTC3405ES6#TRMPBF delivers up to 300mA output current when VIN = 3V. At lower input voltages (e.g., 2.7V), maximum output current decreases due to increased RDS(ON) of the internal P-channel MOSFET - see Figure 2 in the datasheet for derating curves. Peak inductor current capability is 625mA (typ), supporting transient loads beyond steady-state rating.
Does the LTC3405ES6#TRMPBF require an external Schottky diode?
No, the LTC3405ES6#TRMPBF does not require an external Schottky diode. It integrates both a P-channel high-side and N-channel low-side MOSFET to implement synchronous rectification, eliminating conduction losses and improving efficiency by 5–10% compared to diode-based buck converters.
How is the output voltage set on the LTC3405ES6#TRMPBF?
The output voltage of the LTC3405ES6#TRMPBF is set using an external resistive divider connected between VOUT, VFB, and GND. The formula is VOUT = 0.8V × (1 + R1/R2), where R2 connects to VFB and GND, and R1 connects to VOUT and VFB. The 0.8V reference enables precise outputs from 0.8V to 5.5V.
What are the key differences between Burst Mode and pulse-skipping mode on the LTC3405ES6#TRMPBF?
Burst Mode (MODE = GND) minimizes quiescent current to 20µA at light loads by intermittently activating switching cycles, but increases output ripple. Pulse-skipping mode (MODE = VIN) maintains constant 1.5MHz frequency, yielding lower ripple and less EMI - ideal for noise-sensitive audio circuits - though IQ rises to ~35µA at no load.
Is the LTC3405ES6#TRMPBF compatible with all-ceramic output capacitors?
Yes, the LTC3405ES6#TRMPBF supports all-ceramic output capacitors in pulse-skipping mode when VIN ≤ 4.2V and COUT ≥ 4.7µF (X5R/X7R dielectric). For Burst Mode or wider VIN ranges, stability requires either a tantalum capacitor (100–200mΩ ESR) or feedforward compensation from the SW node to VFB.
LTC3405ES6#TRMPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- SOT-23-6 Thin, TSOT-23-6
- 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):
- 2.5V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 5.5V
- Current - Output:
- 300mA
- Frequency - Switching:
- 1.5MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-6
LTC3405ES6#TRMPBF FAQ
1.How can I place an order for LTC3405ES6#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3405ES6#TRMPBF 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 LTC3405ES6#TRMPBF reliable?
The price and inventory of LTC3405ES6#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3405ES6#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC3405ES6#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3405ES6#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3405ES6#TRMPBF?
LTC3405ES6#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3405ES6#TRMPBF 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 LTC3405ES6#TRMPBF?
For technical support, including LTC3405ES6#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3405ES6#TRMPBF requirements.
6.How does Aetrix verify that LTC3405ES6#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC3405ES6#TRMPBF 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 LTC3405ES6#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC3405ES6#TRMPBF?
All LTC3405ES6#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3405ES6#TRMPBF, 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 LTC3405ES6#TRMPBF part is unused and in its original packaging.
Return procedure for LTC3405ES6#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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