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Analog Devices Inc. LTC3406ABES5-2#TRMPBF
- Part No.:
- LTC3406ABES5-2#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
LTC3406ABES5-2#TRMPBF.pdf
- Description:
- IC REG BUCK ADJ 600MA TSOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,446
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Product details
Overview
LTC3406ABES5-2#TRMPBF from Analog Devices (formerly Linear Technology) is a monolithic synchronous step-down DC/DC regulator optimized for single Li-Ion battery-powered systems. It delivers up to 600mA output current with 96% peak efficiency, operates from 2.5V to 5.5V input, features 2.25MHz fixed-frequency current-mode control, and supports low-dropout operation via 100% duty cycle - enabling extended runtime in portable instrumentation and media players.
For engineers reviewing the LTC3406ABES5-2#TRMPBF datasheet, LTC3406ABES5-2#TRMPBF pinout, LTC3406ABES5-2#TRMPBF application, or LTC3406ABES5-2#TRMPBF equivalent, key selection criteria include its 0.6V feedback reference for precise low-voltage regulation, internal P/N-channel MOSFETs eliminating external Schottky diodes, ±2% output voltage accuracy, 200µA quiescent current, and thermal shutdown protection in the TSOT-23-5 package.
Technical Context
The LTC3406ABES5-2#TRMPBF employs a constant-frequency, current-mode PWM architecture with internal slope compensation to prevent subharmonic oscillation above 40% duty cycle. Its control loop integrates an error amplifier, current comparator, and RS latch driving synchronous P-channel (top) and N-channel (bottom) MOSFETs - enabling fast transient response and stable operation without ESR-dependent output capacitance.
It supports pulse-skipping mode at light loads to maintain regulation while minimizing quiescent current (<1µA in shutdown), and incorporates internal soft-start (0.9ms typical) and overtemperature protection. The 2.25MHz switching frequency allows use of compact 2.2µH inductors and ceramic capacitors, reducing board area and EMI filtering requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 600mA max - sufficient for core logic rails in portable devices like digital cameras and navigation units. |
| Input Voltage Range | 2.5V to 5.5V - matches single-cell Li-ion battery discharge profile (4.2V–2.7V) without external pre-regulation. |
| Switching Frequency | 2.25MHz (±25%) - enables small 2.2µH inductors and 10µF ceramic output capacitors, minimizing footprint. |
| Feedback Reference | 0.6V ±2% - permits accurate 1.2V, 1.8V, or 2.5V outputs using standard resistor ratios; supports remote sensing. |
| Quiescent Current | 200µA active / <1µA shutdown - preserves battery life during standby in always-on wireless modems. |
| Efficiency | Up to 96% at 600mA - reduces thermal load in sealed enclosures; >85% maintained down to 10mA load. |
| Duty Cycle | 100% - sustains regulated output as input drops to VOUT + ILOAD×RDS(ON), critical for end-of-battery-life operation. |
Pinout & Package
The LTC3406ABES5-2#TRMPBF is housed in a 5-lead TSOT-23 (ThinSOT™) package, 2.9mm × 1.6mm × 1.0mm, with exposed pad not connected internally. Thermal resistance θJA = 250°C/W enables operation up to 85°C ambient without heatsinking in typical PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RUN (Pin 1) | Enable/disable control input | Logic-high (>1.5V) enables regulation; logic-low (<0.3V) forces shutdown with <1µA supply current - used for system-level power sequencing. |
| GND (Pin 2) | Power and signal reference | Primary return path for VIN, SW, and feedback network; must be low-impedance connection to minimize noise coupling into VFB. |
| SW (Pin 3) | Switch node | Connection to drains of internal P- and N-channel MOSFETs; carries high di/dt square-wave current - requires short, wide trace to reduce EMI and voltage spikes. |
| VIN (Pin 4) | Main power input | Supplies internal circuitry and switches; requires local 4.7µF ceramic decoupling (X5R/X7R) placed within 2mm of pin to suppress high-frequency ripple. |
| VFB (Pin 5) | Feedback input | Monitors resistive divider output; high-impedance (±30nA bias) node - must be routed away from SW and VIN traces to avoid regulation errors. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous rectification | Eliminates external Schottky diode - improves efficiency by 5–10% vs. asynchronous designs and reduces thermal stress in compact layouts. |
| Internal soft-start | 0.9ms typical VOUT ramp time - prevents inrush current into downstream capacitors and avoids brown-out in multi-rail systems. |
| Current-mode control | Provides inherent cycle-by-cycle current limiting and excellent line/load transient response - stabilizes output during rapid CPU or RF transceiver load changes. |
| Overtemperature protection | Shuts down both MOSFETs when junction temperature exceeds ~150°C - prevents permanent damage during sustained overload or poor thermal design. |
| Low dropout operation | 100% duty cycle capability - maintains regulation down to VIN = VOUT + (ILOAD × 0.27Ω) at 70°C, extending usable battery range by ~15 minutes in handheld devices. |
Applications
| Cellular Telephones | Personal Navigation Devices |
|---|---|
Use Scenario: Powering baseband processor core voltage (1.2V) and memory I/O (1.8V) from a single Li-Ion cell. IC Role / Device Role / Timing Role: Primary buck regulator providing tightly regulated, low-noise DC supply with fast load-step response to handle burst-mode cellular transmission. Use Value: 96% efficiency at 600mA minimizes heat in sealed phone chassis; 2.25MHz switching avoids interference with GSM/UMTS receive bands. | Use Scenario: Supplying GPS baseband IC and display driver from a 3.7V Li-Ion battery with variable load (10mA–500mA). IC Role / Device Role / Timing Role: Main system power converter delivering stable 2.5V rail with low output ripple (<10mVpp) for sensitive analog GPS front-end circuits. Use Value: Pulse-skipping mode maintains <200µA quiescent current during GPS standby, extending battery life to >20 hours. |
| Wireless Modems | Digital Still Cameras |
Use Scenario: Generating 3.3V for Wi-Fi/Bluetooth SoC and 1.8V for SD card interface in compact DSL modem. IC Role / Device Role / Timing Role: Dual-rail power solution using single IC with external resistor dividers - simplifies BOM and layout versus discrete regulators. Use Value: 2.25MHz operation allows use of 0805-size inductors and 0603 capacitors, fitting within tight 12mm × 12mm PCB area constraints. | Use Scenario: Powering CMOS image sensor and ISP (image signal processor) requiring clean 1.2V and 2.8V supplies. IC Role / Device Role / Timing Role: High-efficiency buck converter supporting rapid on/off cycling during camera preview and capture modes. Use Value: 100% duty cycle extends operational time below 3.0V input - enabling full functionality until battery reaches 2.7V cutoff. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62231DRYR | 2.25MHz, 600mA, 0.6V ref, but uses voltage-mode control and lacks 100% duty cycle; 18µA IQ in PWM mode. | Less suitable for Li-Ion end-of-discharge operation; better for ultra-low-noise apps due to lower switching jitter. | Choose if system prioritizes low-output-ripple over dropout performance and requires TI's WEBENCH® support. |
| MAX8640YETA+ | 3MHz, 600mA, 0.6V ref, integrated soft-start, but only 2.7–5.5V input range - excludes 2.5V startup. | Cannot start from fully charged Li-Ion (4.2V) without input overvoltage risk; higher RDS(ON) reduces efficiency above 300mA. | Prefer when board space is constrained and 3MHz allows smaller passives, but verify input UVLO compatibility. |
Compared with TPS62231DRYR and MAX8640YETA+, the LTC3406ABES5-2#TRMPBF uniquely combines 2.5V startup, 100% duty cycle, and current-mode stability - making it the optimal choice for battery-powered systems requiring maximum runtime and robust transient response across the full input range.
Availability
LTC3406ABES5-2#TRMPBF is available at Aetrix Electronics and suitable for cellular telephones, personal navigation devices, wireless modems, digital still cameras, and portable instruments requiring stable component supply with guaranteed long-term availability.
Supply support for LTC3406ABES5-2#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 acquired Linear Technology in 2017 and maintains its precision analog and power management portfolio. Linear pioneered high-performance DC/DC regulators with proprietary architectures for efficiency, size, and reliability.
The LTC3406AB series was designed specifically for space-constrained, battery-operated portable electronics demanding high efficiency across wide load ranges, minimal external components, and robust thermal behavior in thin-profile packages.
FAQ
What is the minimum input voltage required for the LTC3406ABES5-2#TRMPBF to start switching?
The LTC3406ABES5-2#TRMPBF has a guaranteed startup voltage of 2.5V per its Absolute Maximum Ratings and Electrical Characteristics table. It will begin regulation and deliver output current once VIN reaches 2.5V, making it compatible with deeply discharged single-cell Li-Ion batteries down to 2.5V. Below this threshold, the device remains in undervoltage lockout and draws negligible current.
Does the LTC3406ABES5-2#TRMPBF require an external Schottky diode?
No, the LTC3406ABES5-2#TRMPBF does not require an external Schottky diode. It integrates both a P-channel high-side MOSFET and an N-channel low-side synchronous rectifier, enabling full synchronous rectification. This eliminates conduction losses associated with external diodes and improves efficiency by up to 10% compared to asynchronous buck converters - a key advantage confirmed in the device's Typical Application schematics and Efficiency vs Load Current graphs.
What is the purpose of the RUN pin on the LTC3406ABES5-2#TRMPBF, and what voltage levels enable or disable it?
The RUN pin on the LTC3406ABES5-2#TRMPBF controls device enablement: applying ≥1.5V enables regulation, while ≤0.3V forces shutdown with <1µA supply current. The pin has ±1µA leakage and must not be left floating. This feature allows precise system-level power sequencing - for example, enabling the LTC3406ABES5-2#TRMPBF only after a microcontroller asserts a valid enable signal, preventing uncontrolled power-up.
Can the LTC3406ABES5-2#TRMPBF operate in dropout mode, and how is output voltage maintained?
Yes, the LTC3406ABES5-2#TRMPBF supports 100% duty cycle operation to maintain regulation in dropout mode. When VIN approaches VOUT, the controller holds the P-channel MOSFET continuously on. Output voltage then equals VIN minus the drop across the P-FET's RDS(ON) (0.23Ω typ at 25°C) and the inductor DCR. This behavior is explicitly documented in the "Dropout Operation" section and validated in Figure G09 (Output Voltage vs Load Current at low VIN).
What package type and dimensions does the LTC3406ABES5-2#TRMPBF use, and is thermal pad connection required?
The LTC3406ABES5-2#TRMPBF uses a 5-lead TSOT-23 (ThinSOT™) package measuring 2.9mm × 1.6mm × 1.0mm. Its thermal pad is not electrically connected and requires no soldering or grounding - unlike many modern power ICs, this device relies solely on lead-frame conduction. The datasheet specifies θJA = 250°C/W with standard JEDEC 2-layer board conditions, and no thermal pad attachment is specified or recommended in the Layout Diagram (Figure F04).
LTC3406ABES5-2#TRMPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- SOT-23-5 Thin, TSOT-23-5
- 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):
- 0.6V
- Voltage - Output (Max):
- 5.5V
- Current - Output:
- 600mA
- Frequency - Switching:
- 1.5MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-5
LTC3406ABES5-2#TRMPBF FAQ
1.How can I place an order for LTC3406ABES5-2#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3406ABES5-2#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 LTC3406ABES5-2#TRMPBF reliable?
The price and inventory of LTC3406ABES5-2#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3406ABES5-2#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC3406ABES5-2#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3406ABES5-2#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3406ABES5-2#TRMPBF?
LTC3406ABES5-2#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3406ABES5-2#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 LTC3406ABES5-2#TRMPBF?
For technical support, including LTC3406ABES5-2#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3406ABES5-2#TRMPBF requirements.
6.How does Aetrix verify that LTC3406ABES5-2#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC3406ABES5-2#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 LTC3406ABES5-2#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC3406ABES5-2#TRMPBF?
All LTC3406ABES5-2#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3406ABES5-2#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 LTC3406ABES5-2#TRMPBF part is unused and in its original packaging.
Return procedure for LTC3406ABES5-2#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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