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Analog Devices Inc. LTC3406ABES5-2#TRPBF
- Part No.:
- LTC3406ABES5-2#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
LTC3406ABES5-2#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 600MA TSOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,628
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Product details
Overview
LTC3406ABES5-2#TRPBF 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 PWM operation, and supports low dropout via 100% duty cycle - enabling extended runtime in portable instruments and media players.
For engineers reviewing the LTC3406ABES5-2#TRPBF datasheet, LTC3406ABES5-2#TRPBF pinout, LTC3406ABES5-2#TRPBF application, or LTC3406ABES5-2#TRPBF equivalent, key selection criteria include its ThinSOT-23 package footprint, internal 0.6V feedback reference for precise low-voltage regulation (e.g., 1.2V–2.5V), ±2% output voltage accuracy, <1µA shutdown current, and absence of external Schottky diode requirement.
Technical Context
The LTC3406ABES5-2#TRPBF employs a constant-frequency, current-mode control architecture with integrated P-channel main and N-channel synchronous MOSFETs. Its 2.25MHz oscillator enables compact 2.2µH inductor and ceramic capacitor designs while maintaining stable pulse-skipping mode at light loads to minimize output ripple.
Internal slope compensation prevents subharmonic oscillation above 40% duty cycle, and a patented scheme preserves full 1.25A peak inductor current capability across all operating conditions. The device integrates soft-start (0.9ms typical), overtemperature protection, and independent RUN pin logic (0.3V–1.5V threshold) for controlled enable/disable sequencing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5V to 5.5V - matches single-cell Li-ion battery discharge profile (4.2V → 2.7V). |
| Output Current | 600mA continuous - sufficient for baseband processors, RF transceivers, and display drivers in handheld devices. |
| Switching Frequency | 2.25MHz (±25%) - enables use of small 2.2µH inductors and 10µF ceramic output capacitors without compromising transient response. |
| Feedback Reference | 0.6V ±2% - allows accurate programming of 1.2V, 1.8V, or 2.5V outputs using standard 1% resistor dividers. |
| Quiescent Current | 200µA active / <1µA shutdown - minimizes battery drain during standby in always-on portable applications. |
| Efficiency | Up to 96% at 600mA - achieved via synchronous rectification and low RDS(ON) (0.23Ω P-FET / 0.21Ω N-FET). |
| Duty Cycle | 100% - supports low-dropout operation down to VIN ≈ VOUT + ILOAD × RDS(ON), extending usable battery life. |
Pinout & Package
Package: 5-lead TSOT-23 (ThinSOT™), 1mm height, RoHS-compliant, lead-free finish. Pin-compatible with industry-standard SOT-23-5 layout but with thinner profile.
| 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 - requires pull-up or active control, not floating. |
| GND (Pin 2) | Power and signal reference | Primary ground return for VIN decoupling, SW node, and feedback network - must be low-impedance connection to PCB ground plane. |
| SW (Pin 3) | Switch node | Connection point for external inductor - carries high di/dt square-wave current; requires short, wide trace to minimize EMI and voltage ringing. |
| VIN (Pin 4) | Main power input | Supplies internal circuitry and power switches - must be decoupled within 2mm of pin with ≥2.2µF X5R/X7R ceramic capacitor to GND (Pin 2). |
| VFB (Pin 5) | Feedback sensing input | Monitors resistive divider output; regulates VOUT to 0.6V - connects directly to top of R2 in divider; sensitive to noise, must be routed away from SW node. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous Buck Architecture | Eliminates external Schottky diode, reduces conduction loss, and improves efficiency by >5% vs. asynchronous designs at 600mA. |
| 2.25MHz Fixed Switching | Enables use of 2.2µH inductors (e.g., Murata LQH32CN2R2M33) and 10µF ceramic capacitors - cuts solution size by >40% vs. 500kHz regulators. |
| 100% Duty Cycle Operation | Maintains regulation when VIN drops to ~VOUT + 120mV (at 600mA), extending battery runtime in deep-discharge states. |
| Internal Soft-Start | 0.9ms typical VOUT ramp time - limits inrush current into output capacitance and prevents input voltage sag during startup. |
| Overtemperature Protection | Thermal shutdown activates at ~150°C junction temperature - protects device during sustained overload or poor PCB thermal design. |
Applications
| Cellular Telephones | Digital Still Cameras |
|---|---|
Use Scenario: Powering baseband processor core and memory interface from single Li-ion cell (2.7V–4.2V). IC Role / Device Role / Timing Role: Primary buck regulator delivering regulated 1.2V/1.8V at up to 600mA with fast load transient response. Use Value: 96% efficiency at 600mA and <1µA shutdown current extend talk time and standby duration beyond competitive 1.5MHz solutions. | Use Scenario: Supplying image sensor analog front-end and ISP core requiring low-noise, tightly regulated 2.5V rail. IC Role / Device Role / Timing Role: Low-ripple synchronous buck converter operating in pulse-skipping mode during preview mode (low ILOAD). Use Value: 2.25MHz switching avoids interference with sensor pixel clock harmonics; ±2% output accuracy ensures consistent ADC reference stability. |
| Personal Navigation Devices | Wireless Modems |
Use Scenario: Generating 3.3V system rail for GPS receiver, microcontroller, and flash memory in battery-operated handheld units. IC Role / Device Role / Timing Role: High-efficiency step-down regulator supporting 100% duty cycle during battery brownout (VIN = 3.3V). Use Value: Maintains regulation down to VIN = VOUT + ILOAD×RDS(ON), preventing unexpected resets during low-battery operation. | Use Scenario: Powering LTE/Wi-Fi baseband ICs with dynamic current demands (10mA–600mA) in compact IoT gateways. IC Role / Device Role / Timing Role: Compact, thermally efficient DC/DC converter enabling fanless enclosure design with minimal heatsinking. Use Value: TSOT-23 package and 250°C/W θJA allow operation at 70°C ambient with 600mA load without derating - verified via thermal modeling. |
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, 2.05V–6.5V input, 0.6V reference, but only 92% peak efficiency and higher quiescent current (25µA in DCS-Control™ mode). | Less suitable for ultra-low-power standby modes due to higher shutdown current (0.1µA vs. LTC3406ABES5-2#TRPBF's <1µA). | Select if wider input range or TI ecosystem support is prioritized over peak efficiency and lowest shutdown IQ. |
| MAX17222ETA+ | 1.2MHz, 500mA, 2.0V–5.5V input, 0.6V reference, 95% peak efficiency, but lacks 100% duty cycle and has slower transient response. | Not recommended for Li-ion dropout scenarios where VIN falls below 2.7V - may lose regulation before battery depletion. | Choose for cost-sensitive designs where 1.2MHz frequency and smaller inductor size are acceptable trade-offs for reduced feature set. |
Compared with TPS62231DRYR and MAX17222ETA+, the LTC3406ABES5-2#TRPBF provides superior dropout performance (100% duty cycle), lower shutdown current, and higher peak efficiency - making it optimal for space-constrained, battery-critical applications demanding maximum runtime and robust low-VIN operation.
Availability
LTC3406ABES5-2#TRPBF is available at Aetrix Electronics and suitable for cellular telephones, digital still cameras, personal navigation devices, and wireless modems requiring stable component supply, long-term lifecycle support, and guaranteed RoHS-compliant manufacturing.
Supply support for LTC3406ABES5-2#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 acquired Linear Technology in 2017 and maintains its legacy of high-performance power management ICs with rigorous characterization and automotive-grade reliability testing.
The LTC3406AB series targets portable, battery-powered applications requiring compact, efficient, and low-quiescent-current DC/DC conversion - specifically engineered for Li-ion voltage ranges and fast transient response in consumer handheld electronics.
FAQ
What is the minimum input voltage required for the LTC3406ABES5-2#TRPBF to maintain regulation at 600mA output?
The LTC3406ABES5-2#TRPBF maintains regulation down to VIN ≈ VOUT + ILOAD × RDS(ON). At 600mA and 25°C, RDS(ON) of the P-channel FET is 0.23Ω, so for a 1.8V output, minimum functional VIN is ~1.8V + 0.138V = 1.938V. However, the absolute minimum specified input is 2.5V per datasheet - operation below this violates Absolute Maximum Ratings and is not guaranteed. The LTC3406ABES5-2#TRPBF achieves true low-dropout behavior only within its 2.5V–5.5V validated range.
Can the LTC3406ABES5-2#TRPBF be used with ceramic input and output capacitors?
Yes, the LTC3406ABES5-2#TRPBF is fully compatible with X5R/X7R ceramic capacitors on both input and output. Its current-mode control loop does not rely on output capacitor ESR for stability, unlike older voltage-mode regulators. Recommended values are ≥2.2µF for CIN (e.g., Taiyo Yuden JMK212BJ475) and ≥10µF for COUT (e.g., Taiyo Yuden JMK316BJ106). Avoid leaving RUN pin floating - use a 100kΩ pull-up to VIN.
Does the LTC3406ABES5-2#TRPBF support adjustable output voltages, and what is the lowest achievable setting?
Yes, the LTC3406ABES5-2#TRPBF is an adjustable regulator with a 0.6V internal feedback reference. Using Equation VOUT = 0.6V × (1 + R2/R1), outputs as low as 0.6V are theoretically possible. However, the datasheet specifies a practical minimum of 1.2V due to resistor divider noise sensitivity and stability constraints at very low VFB currents. For 1.2V output, use R1 = 309kΩ and R2 = 309kΩ (standard 1% values), confirmed in Figure 1 of the LTC3406AB-2 datasheet.
How does the LTC3406ABES5-2#TRPBF handle light-load efficiency compared to Burst Mode® regulators like the LTC3406A?
The LTC3406ABES5-2#TRPBF uses pulse-skipping mode at light loads to maintain regulation while minimizing switching losses - achieving ~85% efficiency at 10mA. In contrast, the pin-compatible LTC3406A employs Burst Mode® operation, which disables the oscillator entirely between pulses, yielding <20µA quiescent current and >90% efficiency at 100µA loads. Choose LTC3406ABES5-2#TRPBF when low output ripple is critical; choose LTC3406A for ultra-low-power standby.
What thermal derating is required for the LTC3406ABES5-2#TRPBF when operating at 600mA and 2.7V input in a 70°C ambient environment?
At 2.7V input and 600mA load, power dissipation is dominated by P-channel RDS(ON). Per Typical Performance curves, RDS(ON) ≈ 0.27Ω at 70°C, giving PD = (0.6A)² × 0.27Ω = 97.2mW. With θJA = 250°C/W, temperature rise is 24.3°C, resulting in TJ = 70°C + 24.3°C = 94.3°C - well below the 125°C maximum. No derating is required; the LTC3406ABES5-2#TRPBF remains within safe operating limits under these conditions.
LTC3406ABES5-2#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:
- 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#TRPBF FAQ
1.How can I place an order for LTC3406ABES5-2#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3406ABES5-2#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 LTC3406ABES5-2#TRPBF reliable?
The price and inventory of LTC3406ABES5-2#TRPBF 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#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3406ABES5-2#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3406ABES5-2#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3406ABES5-2#TRPBF?
LTC3406ABES5-2#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3406ABES5-2#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 LTC3406ABES5-2#TRPBF?
For technical support, including LTC3406ABES5-2#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3406ABES5-2#TRPBF requirements.
6.How does Aetrix verify that LTC3406ABES5-2#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3406ABES5-2#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 LTC3406ABES5-2#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3406ABES5-2#TRPBF?
All LTC3406ABES5-2#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3406ABES5-2#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 LTC3406ABES5-2#TRPBF part is unused and in its original packaging.
Return procedure for LTC3406ABES5-2#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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