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Analog Devices Inc. LT1616ES6#TRPBF
- Part No.:
- LT1616ES6#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- SOT-23-6
- Datasheet:
-
LT1616ES6#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 600MA TSOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:3,885
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Product details
Overview
LT1616ES6#TRPBF from Analog Devices (formerly Linear Technology) is a current-mode PWM step-down DC/DC converter with integrated 600mA bipolar NPN power switch, operating at fixed 1.4MHz switching frequency in a 6-lead SOT-23 package. It supports 3.6V–25V input and delivers up to 400mA at 3.3V or 5V, targeting local logic supply conversion (e.g., 12V-to-3.3V), wall transformer regulation, and battery-powered equipment.
For engineers reviewing the LT1616ES6#TRPBF datasheet, LT1616ES6#TRPBF pinout, LT1616ES6#TRPBF application, or LT1616ES6#TRPBF equivalent, key selection criteria include its internal compensation, <1µA shutdown current, 1.25V feedback reference, 220mV VCE(SAT) at 300mA, and stable ceramic-capacitor operation - all critical for compact, low-quiescent-power buck designs.
Technical Context
The LT1616ES6#TRPBF employs constant-frequency current-mode control with slope-compensated PWM, enabling predictable output ripple and cycle-by-cycle current limiting. Its internal 600mA bipolar NPN switch requires external BOOST capacitor/diode to achieve full saturation, and it features active-clamp current limit with duty-cycle-dependent threshold (80–87% max).
Undervoltage lockout (~3.6V) prevents startup below minimum input, while FB pin regulation at 1.25V ±2.5% enables precise output setting via resistor divider. Frequency foldback reduces switching frequency under overload or low-FB conditions to manage peak current and improve short-circuit robustness.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.6V to 25V - supports 4-cell batteries, 5V/12V rails, and unregulated wall adapters without external LDO pre-regulation. |
| Switching Frequency | 1.4MHz (typ) - enables use of small 4.7–15µH inductors and 1–10µF ceramic output capacitors, minimizing board area. |
| Feedback Reference Voltage | 1.25V (±2.5%) - sets output voltage as VOUT = 1.25V × (1 + R1/R2); allows accurate 1.8V, 2.5V, 3.3V, 5V, or 12V outputs with standard resistors. |
| Max Output Current | 400mA at 3.3V (VIN ≥ 4.7V) - limited by switch current limit (630–850mA) and thermal dissipation in SOT-23 package. |
| Shutdown Current | <1µA - ensures true output disconnect and ultra-low system standby power in battery applications. |
| Switch VCE(SAT) | 220mV at 300mA - minimizes conduction loss and improves efficiency at medium loads vs. MOSFET-based alternatives. |
| Operating Temp Range | –40°C to 85°C - qualified for industrial ambient environments without derating in typical PCB layouts. |
Pinout & Package
LT1616ES6#TRPBF is housed in a 6-lead plastic SOT-23 package (JEDEC MO-178AA, EIAJ SC-74A), measuring 2.9mm × 1.6mm × 1.1mm, with gull-wing leads and exposed pad not present. Thermal resistance θJA = 250°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BOOST (Pin 1) | Boost capacitor drive node | Supplies elevated gate drive voltage (>VIN) to saturate internal bipolar switch; requires 0.01µF capacitor and fast diode (e.g., 1N4148) tied to SW or VIN. |
| GND (Pin 2) | Power and signal ground reference | Must connect to local low-impedance ground plane; feedback divider and input/output capacitors return here to minimize noise coupling. |
| FB (Pin 3) | Feedback input for output regulation | Regulated to 1.25V; sets VOUT = 1.25V × (1 + R1/R2); bias current ≤600nA enables high-resistor-divider designs. |
| SHDN (Pin 4) | Shutdown enable control | Logic-high (≥1.8V) enables operation; logic-low (≤0.4V) disables switch and reduces IQ to <1µA; unused pin must tie to VIN. |
| VIN (Pin 5) | Main power input | Supplies internal regulator and switch; requires local 1µF ceramic bypass capacitor; absolute max 25V. |
| SW (Pin 6) | Switch node output | Connects to inductor, catch diode cathode, and BOOST capacitor; swings from GND to VIN during operation; high dv/dt node requiring tight layout. |
Key Features
| Feature | Design Value |
|---|---|
| Internally compensated | Eliminates external compensation network - reduces BOM count and design iteration time for standard buck configurations. |
| Ceramic-capacitor compatible | Stable with low-ESR ceramic output caps (X5R/X7R) - enables sub-10mV output ripple and eliminates electrolytic bulk capacitance. |
| Fixed 1.4MHz frequency | Predictable EMI profile and consistent inductor sizing - avoids audible noise and simplifies filter design vs. variable-frequency regulators. |
| Low VCE(SAT) switch | 220mV drop at 300mA - delivers >85% efficiency at 3.3V/300mA from 5V input, outperforming many MOSFET-based ICs at mid-load. |
| Current-limit protection | 630mA min switch current limit with active clamp - provides inherent short-circuit tolerance without external sensing circuitry. |
Applications
| Local Logic Supply Conversion | Wall Transformer Regulation |
|---|---|
Use Scenario: Converting 12V wall adapter output to 3.3V for microcontroller I/O and peripherals in industrial controllers. IC Role / Device Role / Timing Role: Primary step-down regulator delivering regulated 3.3V rail with fast transient response to digital load steps. Use Value: Enables direct use of unregulated 12V adapters without pre-LDO stage, reducing component count and cost while maintaining <10mV ripple. |
Use Scenario: Regulating noisy, unregulated 9–24V AC/DC wall adapters for consumer electronics power supplies. IC Role / Device Role / Timing Role: Input-stage buck converter providing clean, low-noise 5V rail for downstream USB ports and analog subsystems. Use Value: High PSRR at 1.4MHz and ceramic-capacitor stability suppress adapter ripple and line transients without LC filters. |
| Battery-Powered Equipment | Digital Cameras |
Use Scenario: Powering image sensor and processor cores from 2–3S Li-ion battery (7–12.6V) in portable medical devices. IC Role / Device Role / Timing Role: Main system regulator delivering 1.8V/2.5V/3.3V rails with ultra-low shutdown current to extend battery life. Use Value: <1µA shutdown current and no external bias components enable multi-week standby without battery drain. |
Use Scenario: Generating 2.5V and 3.3V rails for CMOS image sensor, ISP, and SD card interface in compact digital cameras. IC Role / Device Role / Timing Role: Dual-rail point-of-load converter supporting burst-mode imaging and low-power sleep states. Use Value: Small SOT-23 footprint and 1.4MHz operation allow integration into space-constrained camera modules without compromising efficiency. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3652EMSE#TRPBF | 42V input, 2A switch, synchronous rectification, programmable charge termination - larger MSOP-10 package, higher quiescent current (45µA). | Targets Li-ion charging + regulation; unsuitable for low-IQ battery backup due to higher shutdown current. | Select only if input exceeds 25V or synchronous efficiency >90% is required; not drop-in for LT1616ES6#TRPBF layouts. |
| TPS62231DRVR | 3–6.5V input, 600mA, 3.6MHz sync buck, 17µA IQ, 0.6V ref - smaller 6-pin WSON, but narrower VIN range and no BOOST pin. | Optimized for single-cell Li-ion or 3.3V/5V systems; lacks wide-VIN capability and bipolar-switch efficiency at high VIN. | Prefer for low-input, high-frequency, space-constrained apps; avoid when input may exceed 6.5V or 1.4MHz EMI profile is mandated. |
Compared with LT3652EMSE#TRPBF and TPS62231DRVR, the LT1616ES6#TRPBF uniquely balances wide 3.6V–25V input, ultra-low shutdown current, and bipolar-switch efficiency in SOT-23 - making it optimal for industrial wall-adapter and multi-battery systems where input variability and standby power dominate selection.
Availability
LT1616ES6#TRPBF is available at Aetrix Electronics and suitable for local logic supply conversion, wall transformer regulation, and battery-powered equipment requiring stable component supply across industrial temperature ranges and long production lifecycles.
Supply support for LT1616ES6#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) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LT1616ES6#TRPBF belongs to Linear's legacy high-voltage buck regulator product line, designed specifically for compact, wide-input, low-quiescent-power DC/DC conversion in space- and energy-constrained applications.
FAQ
What is the maximum output current achievable with LT1616ES6#TRPBF at 3.3V?
The LT1616ES6#TRPBF delivers up to 400mA at 3.3V when input voltage is ≥4.7V, as confirmed by Typical Performance Characteristics (Figure G05). This limit arises from thermal constraints in the SOT-23 package and the 630mA minimum switch current limit, which decreases at higher duty cycles. For sustained 400mA operation, proper PCB copper area and airflow are required to maintain junction temperature ≤125°C.
Can LT1616ES6#TRPBF operate with ceramic output capacitors only?
Yes, the LT1616ES6#TRPBF is explicitly designed for stable operation with ceramic output capacitors, as stated in the Features section and verified in Application Information. Its current-mode control and internal compensation eliminate ESR dependency, enabling low-ripple designs using X5R/X7R 10µF ceramics - unlike many older buck regulators requiring tantalum or aluminum electrolytics for loop stability.
What is the purpose of the BOOST pin on LT1616ES6#TRPBF, and how is it implemented?
The BOOST pin on LT1616ES6#TRPBF supplies an elevated voltage (>VIN) to fully saturate the internal bipolar NPN power switch, minimizing VCE(SAT). It is implemented with an external 0.01µF capacitor and fast diode (e.g., 1N4148) connected between SW and BOOST pins. The datasheet specifies BOOST must be >2.5V above SW for best efficiency, and maximum BOOST voltage is limited to 35V absolute rating.
Does LT1616ES6#TRPBF require external compensation components?
No, the LT1616ES6#TRPBF is internally compensated, as confirmed in both the Features list and Electrical Characteristics table. This eliminates the need for external RC networks on the COMP or VC pin - a key differentiator from many current-mode buck controllers. Only the FB resistor divider, input/output capacitors, inductor, and BOOST diode/capacitor are required for basic operation.
How does LT1616ES6#TRPBF handle short-circuit conditions?
The LT1616ES6#TRPBF responds to output shorts via frequency foldback: when FB voltage drops, the oscillator reduces switching frequency (down to ~700kHz), extending off-time to limit peak inductor current and prevent thermal runaway. Combined with cycle-by-cycle current limiting (630–850mA), this provides robust short-circuit protection without external circuitry - validated in the Operating Waveforms and Shorted Input Protection sections.
LT1616ES6#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- SOT-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):
- 3.6V
- Voltage - Input (Max):
- 25V
- Voltage - Output (Min/Fixed):
- 1.25V
- Voltage - Output (Max):
- 21.75V
- Current - Output:
- 600mA
- Frequency - Switching:
- 1.4MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-6
LT1616ES6#TRPBF FAQ
1.How can I place an order for LT1616ES6#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1616ES6#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 LT1616ES6#TRPBF reliable?
The price and inventory of LT1616ES6#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1616ES6#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1616ES6#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1616ES6#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1616ES6#TRPBF?
LT1616ES6#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1616ES6#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 LT1616ES6#TRPBF?
For technical support, including LT1616ES6#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1616ES6#TRPBF requirements.
6.How does Aetrix verify that LT1616ES6#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1616ES6#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 LT1616ES6#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1616ES6#TRPBF?
All LT1616ES6#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1616ES6#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 LT1616ES6#TRPBF part is unused and in its original packaging.
Return procedure for LT1616ES6#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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