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Analog Devices Inc. LTC3406AES5#TRPBF
- Part No.:
- LTC3406AES5#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
LTC3406AES5#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 600MA TSOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:6,051
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Product details
Overview
LTC3406AES5#TRPBF from Analog Devices (formerly Linear Technology) is a high-efficiency, 1.5MHz synchronous step-down DC/DC regulator in a 5-lead TSOT-23 package, delivering up to 600mA output current with 2.5V–5.5V input range and 0.6V feedback reference. It features Burst Mode® operation (20μA quiescent current), 100% duty cycle for low-dropout operation, and internal P/N-channel MOSFETs eliminating external Schottky diodes - ideal for single Li-Ion battery-powered portable instruments and media players.
For engineers reviewing the LTC3406AES5#TRPBF datasheet, LTC3406AES5#TRPBF pinout, LTC3406AES5#TRPBF application, or LTC3406AES5#TRPBF equivalent, key selection criteria include its –40°C to +85°C operating temperature grade, ±2% 0.6V reference accuracy, 1.5MHz fixed switching frequency enabling compact 2.2μH inductor use, and thermal performance validated via θJA = 250°C/W in ThinSOT packaging.
Technical Context
The LTC3406AES5#TRPBF employs constant-frequency current-mode control with internal slope compensation to prevent subharmonic oscillation at >40% duty cycles. Its dual-MOSFET architecture integrates a 0.23Ω P-channel main switch and 0.21Ω N-channel synchronous switch, enabling high efficiency across load range without external diode.
Burst Mode® operation dynamically disables switching circuitry during light loads, reducing supply current to 20μA while maintaining regulation via output capacitor discharge/recharge cycles. Shutdown mode draws ≤1μA, and internal soft-start (0.9ms typical) limits inrush current during enable.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5V to 5.5V - supports full single-cell Li-Ion battery discharge curve (2.7V–4.2V) with margin. |
| Output Current | 600mA continuous - sufficient for core logic rails in portable instrumentation and modems. |
| Switching Frequency | 1.5MHz (typ) - enables use of small 2.2μH inductors and ceramic capacitors for minimal board area. |
| Feedback Reference | 0.6V ±2% - allows precise output programming down to 0.6V (e.g., 1.2V with 301k/301k divider). |
| Quiescent Current | 20μA (active), ≤1μA (shutdown) - extends runtime in standby modes of battery-powered devices. |
| Efficiency | Up to 96% - achieved via synchronous rectification and low RDS(ON) switches (0.23Ω/0.21Ω). |
| Duty Cycle | 100% - maintains regulation even when input drops near output voltage (e.g., 2.7V → 1.8V). |
Pinout & Package
Package: 5-lead TSOT-23 (ThinSOT™), 1mm height, RoHS-compliant, moisture-sensitive level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RUN (Pin 1) | Enable control input | Logic-high (>1.5V) enables regulator; <0.3V forces shutdown with ≤1μA supply draw - requires pull-up or active control. |
| GND (Pin 2) | Power ground reference | Primary return path 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; routing must minimize loop area to reduce EMI. |
| VIN (Pin 4) | Main power input | Supplies internal circuitry and switches - requires ≥2.2μF ceramic capacitor placed adjacent to pin per layout guidelines. |
| VFB (Pin 5) | Feedback input | Monitors resistive divider output - high-impedance (±30nA bias) node; sensitive to noise - keep trace short and away from SW. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Synchronous Power Stage | Eliminates external Schottky diode, reduces conduction loss, and improves efficiency by ~5–8% vs. asynchronous designs. |
| Burst Mode® Operation | Maintains regulation at light loads (<10mA) while holding quiescent current at 20μA - critical for battery life in idle states. |
| Internal Soft-Start | 0.9ms typical VOUT ramp time - prevents inrush current into output capacitors and avoids system brownouts during power-up. |
| Overtemperature Protection | Thermal shutdown activates above ~150°C junction temperature - protects device during sustained overload or poor heatsinking. |
| Low-Noise Feedback Architecture | ±2% reference tolerance and 0.04%/V line regulation ensure stable output under varying input conditions (e.g., battery sag). |
Applications
| Cellular Telephones | Wireless Modems |
|---|---|
Use Scenario: Powering baseband processor core voltage (1.2V/600mA) from single Li-Ion cell (2.7V–4.2V). IC Role / Device Role / Timing Role: Primary buck regulator providing tightly regulated, low-noise core supply with fast transient response to burst traffic demands. Use Value: 96% peak efficiency and Burst Mode® extend talk time by >25% versus older 500kHz regulators; 100% duty cycle sustains operation down to 2.7V battery voltage. |
Use Scenario: Generating 1.8V/600mA rail for RF transceiver IC in 4G/LTE USB dongle with space-constrained PCB. IC Role / Device Role / Timing Role: Compact, high-frequency DC/DC converter enabling miniaturized power stage using 2.2μH inductor and 0402 ceramics. Use Value: 1.5MHz operation reduces inductor size by 2× vs. 500kHz alternatives; TSOT-23 footprint saves >30% board area versus SO-8 equivalents. |
| Digital Still Cameras | Portable Instruments |
Use Scenario: Supplying image sensor analog front-end (2.5V/600mA) with low ripple during high-speed capture sequences. IC Role / Device Role / Timing Role: Low-ESR-compatible regulator supporting ceramic output caps to achieve <10mVpp ripple at 600mA load. Use Value: Internal synchronous switches and 0.6V reference enable stable 2.5V output with ±1% regulation over temperature - critical for ADC reference stability. |
Use Scenario: Providing 3.3V/600mA for microcontroller and sensor interface in handheld multimeter with 8-hour battery life target. IC Role / Device Role / Timing Role: High-efficiency, low-quiescent-current buck converter enabling extended standby (2mA) and active (600mA) operation from same cell. Use Value: 20μA Burst Mode current and ≤1μA shutdown draw reduce average power by 90% vs. linear regulators - directly enabling multi-day battery life. |
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 |
|---|---|---|---|
| TPS62231DRVR | 3MHz switching frequency, 0.6V reference, but only 300mA output current; smaller 2mm × 2mm WSON package. | Lower current capacity limits use in 600mA applications; higher frequency allows smaller inductors but increases gate drive losses. | Select only if load current ≤300mA and board space is more critical than output capability. |
| MP2108DJ-LF-Z | 1.5MHz, 600mA, but uses external compensation and lacks Burst Mode - quiescent current is 45μA (vs. 20μA). | No light-load efficiency optimization; requires additional RC network for loop stability - increases BOM count and layout complexity. | Choose only if cost sensitivity outweighs battery life requirements and design team has compensation tuning expertise. |
Compared with TPS62231DRVR and MP2108DJ-LF-Z, the LTC3406AES5#TRPBF delivers superior light-load efficiency via integrated Burst Mode®, maintains full 600mA capability in the smallest possible footprint (TSOT-23), and requires zero external compensation - simplifying design validation and reducing time-to-market for portable battery-powered systems.
Availability
LTC3406AES5#TRPBF 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 availability and consistent parametric performance.
Supply support for LTC3406AES5#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 full product support, datasheets, and application engineering for legacy Linear parts including the LTC3406A family.
The LTC3406A series was designed specifically for space-constrained, battery-powered portable electronics demanding high efficiency across wide load ranges - emphasizing ultra-low quiescent current, small-footprint integration, and robust dropout performance.
FAQ
What is the operating temperature range for the LTC3406AES5#TRPBF?
The LTC3406AES5#TRPBF is rated for operation from –40°C to +85°C ambient temperature. This grade (denoted by "E" suffix) is validated across the full range for parameters including feedback reference (±2%), oscillator frequency (1.2–1.8MHz), and RDS(ON) (0.23Ω/0.21Ω typical). Junction temperature must remain ≤125°C under all conditions, with thermal resistance θJA = 250°C/W in standard PCB layout.
Does the LTC3406AES5#TRPBF require an external Schottky diode?
No, the LTC3406AES5#TRPBF does not require an external Schottky diode. It integrates both a P-channel main switch and an N-channel synchronous switch, enabling fully synchronous rectification. This eliminates diode forward-voltage drop losses and improves efficiency by 5–8% compared to asynchronous buck converters - a key advantage confirmed in all typical efficiency curves (e.g., Figure 3406A G01).
How is output voltage programmed on the LTC3406AES5#TRPBF?
Output voltage is programmed using an external resistive divider connected between VOUT and GND, with the midpoint feeding the VFB pin. The formula is VOUT = 0.6V × (1 + R2/R1). For example, a 1.2V output uses R1 = 301kΩ and R2 = 301kΩ; a 2.5V output uses R1 = 316kΩ and R2 = 1MΩ. The VFB pin draws only ±30nA, minimizing divider current error and enabling high-resistance values to reduce power loss.
What is the purpose of the RUN pin on the LTC3406AES5#TRPBF?
On the LTC3406AES5#TRPBF, the RUN pin (Pin 1) controls device enable/disable state. Pulling RUN >1.5V enables regulation with internal soft-start; pulling RUN <0.3V forces shutdown, reducing supply current to ≤1μA. The pin must never be left floating - a 100kΩ pull-up to VIN is recommended for default-enable operation. RUN threshold and leakage (±1μA) are specified across the full temperature range.
Can the LTC3406AES5#TRPBF operate in 100% duty cycle mode?
Yes, the LTC3406AES5#TRPBF supports true 100% duty cycle operation, allowing VOUT to track VIN minus ILOAD × RDS(ON) when input voltage approaches output voltage. This extends usable battery life in single-cell Li-Ion systems (e.g., sustaining 1.8V output down to 2.7V input). However, power dissipation must be calculated using RDS(ON) at operating temperature (e.g., 0.27Ω at 70°C) to ensure junction temperature remains within 125°C limit.
LTC3406AES5#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
LTC3406AES5#TRPBF FAQ
1.How can I place an order for LTC3406AES5#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3406AES5#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 LTC3406AES5#TRPBF reliable?
The price and inventory of LTC3406AES5#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3406AES5#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3406AES5#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3406AES5#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3406AES5#TRPBF?
LTC3406AES5#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3406AES5#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 LTC3406AES5#TRPBF?
For technical support, including LTC3406AES5#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3406AES5#TRPBF requirements.
6.How does Aetrix verify that LTC3406AES5#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3406AES5#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 LTC3406AES5#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3406AES5#TRPBF?
All LTC3406AES5#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3406AES5#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 LTC3406AES5#TRPBF part is unused and in its original packaging.
Return procedure for LTC3406AES5#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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