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Analog Devices Inc. LTC3406ES5-1.5#TRPBF
- Part No.:
- LTC3406ES5-1.5#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
LTC3406ES5-1.5#TRPBF.pdf
- Description:
- IC REG BUCK 1.5V 600MA TSOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,634
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Product details
Overview
LTC3406ES5-1.5#TRPBF from Analog Devices (formerly Linear Technology) is a monolithic synchronous step-down DC/DC regulator in TSOT-23-5 package, delivering up to 600mA at fixed 1.5V output with 96% peak efficiency, 1.5MHz switching frequency, and 20µA quiescent current-designed for single Li-ion battery-powered portable electronics requiring compact, high-efficiency power conversion.
For engineers reviewing the LTC3406ES5-1.5#TRPBF datasheet, LTC3406ES5-1.5#TRPBF pinout, LTC3406ES5-1.5#TRPBF application, or LTC3406ES5-1.5#TRPBF equivalent, key selection criteria include its 2.5V–5.5V input range, 100% duty-cycle dropout capability, internal 0.6V reference, thermal shutdown, and Burst Mode® operation for ultra-low-load efficiency.
Technical Context
The LTC3406ES5-1.5#TRPBF employs constant-frequency current-mode control with integrated P-channel main and N-channel synchronous switches. Its architecture supports automatic Burst Mode® operation below ~200mA load, reducing quiescent current to 20µA while maintaining regulation via periodic burst cycles.
It features internal slope compensation to prevent subharmonic oscillation above 40% duty cycle, a patented scheme preserving full 1.25A peak inductor current across all duty cycles, and oscillator frequency foldback to ~210kHz during short-circuit conditions for safe current limiting.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.5V ±30mV (1.455V–1.545V) at 100mA load-enables direct replacement of LDOs in 1.5V rail applications without external feedback resistors. |
| Input Voltage Range | 2.5V to 5.5V-supports full discharge range of single-cell Li-ion (2.7V–4.2V) and compatibility with 3.3V/5V system rails. |
| Switching Frequency | 1.5MHz (typ), 1.2–1.8MHz (min–max)-permits use of small 2.2µH inductors and ceramic capacitors, minimizing board area. |
| Max Output Current | 600mA continuous-sufficient for core logic, RF front-ends, and sensor subsystems in handheld devices. |
| Quiescent Current | 20µA in active mode, ≤1µA in shutdown-extends battery runtime in standby and low-power sleep states. |
| Efficiency | Up to 96% at medium loads-reduces thermal stress and enables thermally constrained thin-profile designs. |
| Duty Cycle | 100%-maintains regulation down to VIN ≈ VOUT + ILOAD × RDS(ON), critical for end-of-battery-life operation. |
Pinout & Package
Package: 5-lead TSOT-23 (ThinSOT™), 1mm profile, 0.95mm pitch, RoHS-compliant, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RUN (Pin 1) | Enable control input | Active-high logic: ≥1.5V enables regulation; ≤0.3V forces shutdown with ≤1µA supply current-requires pull-up or MCU GPIO control. |
| GND (Pin 2) | Power ground reference | Primary return path for input capacitor, inductor, and IC substrate-must be low-impedance, directly connected to power plane. |
| SW (Pin 3) | Switch node | Connection point for external inductor; carries high di/dt square-wave voltage-requires short, wide trace and isolation from sensitive nodes (e.g., VFB). |
| VIN (Pin 4) | Main input supply | Accepts 2.5V–5.5V; requires local 2.2µF+ ceramic decoupling placed adjacent to pin to minimize AC loop inductance. |
| VOUT (Pin 5) | Fixed-output feedback | Internally connected to 1.5V divider; no external resistor needed-simplifies layout and eliminates feedback resistor tolerance errors. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous rectification | Eliminates external Schottky diode-reduces BOM count, improves efficiency by ~5–10% vs. asynchronous buck, and lowers thermal footprint. |
| Burst Mode® operation | Reduces light-load quiescent current to 20µA while maintaining tight output regulation-critical for always-on sensors and Bluetooth LE subsystems. |
| 100% duty-cycle capability | Extends usable battery life by sustaining 1.5V output down to ~1.6V input-delays system brownout during deep discharge. |
| Internal 0.6V reference | Enables stable 1.5V output with <±2% total error over –40°C to 85°C-no external trimming required for production calibration. |
| Overtemperature protection | Thermal shutdown at ~150°C junction temperature-prevents permanent damage during sustained overload or poor PCB heatsinking. |
Applications
| Cellular Telephones | Digital Still Cameras |
|---|---|
Use Scenario: Powering baseband processor core voltage in GSM/UMTS smartphones operating from single Li-ion cell. IC Role / Device Role / Timing Role: Primary 1.5V synchronous buck regulator supplying CPU I/O and memory interface rails. Use Value: 96% efficiency at 300mA extends talk time; 1.5MHz switching allows miniaturized 2.2µH inductor and 10µF ceramic output cap-reducing solution size by >40% vs. legacy 500kHz solutions. | Use Scenario: Supplying image sensor analog front-end and ISP core logic in compact digital cameras. IC Role / Device Role / Timing Role: Fixed-output DC/DC converter delivering clean, regulated 1.5V with low noise and fast transient response. Use Value: Burst Mode® ensures <25µA quiescent draw during image capture standby; 100% duty cycle maintains 1.5V output even as battery drops to 2.7V-preserving sensor functionality until full discharge. |
| Wireless Modems | Portable Instruments |
Use Scenario: Regulating power for Wi-Fi/BT combo modules in USB-powered dongles and embedded gateways. IC Role / Device Role / Timing Role: High-efficiency step-down regulator interfacing between 5V USB input and 1.5V module logic supply. Use Value: 2.5V–5.5V input range accepts both USB 5V and Li-ion backup; 1.5MHz operation avoids AM radio band interference; TSOT-23-5 footprint fits space-constrained USB stick form factors. | Use Scenario: Providing stable 1.5V bias to precision ADCs, op-amps, and microcontroller peripherals in handheld test equipment. IC Role / Device Role / Timing Role: Low-noise, low-quiescent-current power source for signal-chain components requiring minimal supply ripple. Use Value: Internal synchronous switch and ceramic-capable design yield <10mVPP output ripple at 600mA; thermal shutdown protects against fault-induced overheating in sealed enclosures. |
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 1.5V output, 1.8MHz switching, 600mA, 17µA IQ-but uses different pinout (VIN, GND, SW, FB, EN) and requires external feedback for fixed-VOUT variants. | Requires external resistor network for 1.5V setting; lacks integrated VOUT divider-increases BOM and layout complexity. | Select if higher switching frequency is prioritized over pinout compatibility and design simplicity. |
| MAX17222ETA+ | 1.5V fixed, 1.2MHz, 500mA, 1.6µA IQ in 6-pin WLP-but no 100% duty cycle, limited to 5.5V max input, and smaller thermal pad limits power handling. | Lower max current and no dropout mode restrict use in high-pulse-load applications like camera flash drivers. | Select for ultra-low-IQ battery monitoring circuits where 500mA suffices and board area is more critical than thermal headroom. |
Compared with TPS62231DRYR and MAX17222ETA+, the LTC3406ES5-1.5#TRPBF offers superior dropout performance (100% duty cycle), simpler fixed-output implementation (no external resistors), and proven thermal robustness in TSOT-23-making it optimal for cost-sensitive, space-constrained Li-ion systems demanding reliability across full battery discharge.
Availability
LTC3406ES5-1.5#TRPBF is available at Aetrix Electronics and suitable for cellular telephones, digital still cameras, wireless modems, and portable instruments requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for LTC3406ES5-1.5#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, serving industrial, automotive, communications, and consumer markets.
The LTC3406 family was designed specifically for ultra-compact, high-efficiency DC/DC conversion in battery-powered portable electronics-emphasizing low quiescent current, small external components, and robust operation across wide input and temperature ranges.
FAQ
What is the maximum output current capability of the LTC3406ES5-1.5#TRPBF?
The LTC3406ES5-1.5#TRPBF delivers up to 600mA continuous output current under typical conditions (VIN = 3.6V, TA = 25°C). Derating applies at elevated ambient temperatures or low input voltages-e.g., maximum output drops to ~400mA at VIN = 2.7V due to increased RDS(ON) and thermal limits. Full specifications are validated per the Electrical Characteristics table in the official datasheet.
Does the LTC3406ES5-1.5#TRPBF require external feedback resistors to set the 1.5V output?
No. The LTC3406ES5-1.5#TRPBF integrates an internal resistive divider optimized for 1.5V output, connecting Pin 5 (VOUT) directly to the internal 0.6V reference. This eliminates external resistors, reduces BOM cost, improves accuracy by removing resistor tolerance errors, and simplifies PCB layout-unlike the adjustable LTC3406 variant which requires external R1/R2.
How does Burst Mode® operation improve efficiency at light loads in the LTC3406ES5-1.5#TRPBF?
Burst Mode® operation in the LTC3406ES5-1.5#TRPBF reduces quiescent current to 20µA by disabling switching and most internal circuitry between regulated bursts. Each burst delivers just enough energy to maintain output voltage, then the IC enters sleep mode until VOUT droops below threshold. This avoids continuous switching losses at loads <100mA-boosting efficiency from ~65% (PWM mode) to >85% at 1mA, extending battery life in standby.
What thermal considerations apply when using the LTC3406ES5-1.5#TRPBF in dropout mode?
In dropout (100% duty cycle), power dissipation is dominated by ILOAD² × RDS(ON) of the P-channel switch. At 600mA and 70°C ambient, RDS(ON) ≈ 0.52Ω yields ~187mW loss. With θJA = 250°C/W, junction temperature reaches ~117°C-within the 125°C limit. Adequate copper pour on GND and VIN pads is essential; exceeding 125°C triggers thermal shutdown.
Can the LTC3406ES5-1.5#TRPBF operate from a 2.5V input supply?
Yes. The LTC3406ES5-1.5#TRPBF is specified for 2.5V to 5.5V input. At 2.5V, it sustains 1.5V output via 100% duty cycle, though max output current is reduced (~300mA) due to higher RDS(ON) and thermal constraints. Efficiency remains >85% at 100mA, making it viable for end-of-life battery operation in portable systems.
LTC3406ES5-1.5#TRPBF 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:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.5V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 1.5V
- Voltage - Output (Max):
- -
- 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
LTC3406ES5-1.5#TRPBF FAQ
1.How can I place an order for LTC3406ES5-1.5#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3406ES5-1.5#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 LTC3406ES5-1.5#TRPBF reliable?
The price and inventory of LTC3406ES5-1.5#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3406ES5-1.5#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3406ES5-1.5#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3406ES5-1.5#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3406ES5-1.5#TRPBF?
LTC3406ES5-1.5#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3406ES5-1.5#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 LTC3406ES5-1.5#TRPBF?
For technical support, including LTC3406ES5-1.5#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3406ES5-1.5#TRPBF requirements.
6.How does Aetrix verify that LTC3406ES5-1.5#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3406ES5-1.5#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 LTC3406ES5-1.5#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3406ES5-1.5#TRPBF?
All LTC3406ES5-1.5#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3406ES5-1.5#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 LTC3406ES5-1.5#TRPBF part is unused and in its original packaging.
Return procedure for LTC3406ES5-1.5#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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