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Analog Devices Inc. LT1616ES6#TRMPBF
- Part No.:
- LT1616ES6#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- SOT-23-6
- Datasheet:
-
LT1616ES6#TRMPBF.pdf
- Description:
- IC REG BUCK ADJ 600MA TSOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:2,044
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Product details
Overview
LT1616ES6#TRMPBF from Analog Devices (formerly Linear Technology) is a current-mode PWM step-down DC/DC converter with an integrated 600mA bipolar NPN power switch, operating at a fixed 1.4MHz switching frequency. It accepts 3.6V–25V input and delivers up to 400mA at 3.3V or 5V output, targeting local logic supply conversion in space-constrained battery-powered and distributed power systems.
For engineers reviewing the LT1616ES6#TRMPBF datasheet, LT1616ES6#TRMPBF pinout, LT1616ES6#TRMPBF application, or LT1616ES6#TRMPBF equivalent, key selection criteria include its 1.25V feedback reference, <1µA shutdown current, 220mV switch VCE(SAT) at 300mA, internal compensation, and SOT-23-6 package compatibility with ceramic output capacitors.
Technical Context
The LT1616ES6#TRMPBF implements constant-frequency current-mode control using an internal oscillator, slope-compensated current-sense amplifier, and error amplifier that regulates the FB pin to 1.25V. Its bipolar NPN switch requires external BOOST circuitry (diode + capacitor) to achieve full saturation, enabling efficient operation across wide input ranges.
It features undervoltage lockout (~3.6V), frequency foldback during overload or short-circuit conditions, and cycle-by-cycle current limiting with guaranteed 630mA minimum switch current limit. Thermal protection is not specified; maximum junction temperature is 125°C with θJA = 250°C/W.
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 |
| Switching Frequency | 1.4MHz (typ) - enables use of small 10µH inductors and 1µF/10µF ceramic capacitors |
| Feedback Reference Voltage | 1.25V (±2.5%) - sets output via resistor divider; R2 = 10kΩ recommended |
| Max Output Current | 400mA at 3.3V (VIN ≥ 4.7V); 400mA at 5V (VIN ≥ 7V) - limited by switch current and thermal dissipation |
| Shutdown Current | <1µA - ensures complete output disconnect for ultra-low-power battery management |
| Switch VCE(SAT) | 220mV at 300mA - reduces conduction loss and improves efficiency at medium loads |
| Operating Temperature | –40°C to 85°C - qualified for industrial ambient environments |
Pinout & Package
LT1616ES6#TRMPBF 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 electrically connected.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BOOST (1) | Bootstrap drive voltage node | Supplies >VIN voltage to saturate internal NPN switch; requires external diode + 0.01µF capacitor |
| GND (2) | Power and signal ground reference | Must connect to local ground plane; feedback divider return point |
| FB (3) | Output voltage sensing input | Regulated to 1.25V; sets VOUT = 1.25V × (1 + R1/R2); bias current ≤600nA |
| SHDN (4) | Enable/disable control input | Logic-high (≥1.8V) enables operation; grounded disables with <1µA quiescent draw |
| VIN (5) | Main power input | Supplies internal regulator and switch; requires local 1µF ceramic bypass |
| SW (6) | Switch node output | Connects to inductor, catch diode cathode, and boost capacitor; swings between VIN and ~–0.4V |
Key Features
| Feature | Design Value |
|---|---|
| Internally compensated control loop | Eliminates external compensation components; reduces BOM count and layout sensitivity |
| Ceramic-capacitor compatible regulation | Stable with low-ESR ceramics (X5R/X7R); enables sub-10mV output ripple without ESR dependency |
| Fixed 1.4MHz switching frequency | Predictable EMI profile; allows compact magnetics and filtering without audible noise |
| Low VCE(SAT) bipolar switch | 220mV drop at 300mA improves efficiency over MOSFET-based alternatives at medium load |
| Frequency foldback under overload | Reduces switching frequency when FB voltage falls below 0.44V; limits peak inductor current during short-circuit |
Applications
| Digital Camera Power Supply | Battery-Powered IoT Sensor Node |
|---|---|
Use Scenario: Step-down from 2–3 Li-ion cells (7–12.6V) to 3.3V for image sensor, MCU, and RF transceiver. IC Role / Device Role / Timing Role: Primary local DC/DC regulator providing stable 3.3V rail with fast transient response. Use Value: 400mA capability supports burst-mode imaging; <1µA shutdown extends standby time between sensor readings. |
Use Scenario: Regulating 9V alkaline or 12V lead-acid to 3.3V for microcontroller, BLE radio, and environmental sensors. IC Role / Device Role / Timing Role: High-efficiency buck converter enabling multi-year battery life in remote deployments. Use Value: Wide 3.6–25V input accommodates battery voltage decay; ceramic-capacitor stability avoids electrolytic aging issues. |
| Industrial PLC I/O Module | Automotive Infotainment Core Logic |
Use Scenario: Converting 24V system rail to 5V/3.3V for digital isolators, ADCs, and FPGA configuration logic. IC Role / Device Role / Timing Role: Distributed point-of-load regulator with robust input transient tolerance. Use Value: 25V absolute max input withstands load-dump transients; –40°C to 85°C rating meets industrial temp requirements. |
Use Scenario: Generating 3.3V core supply from 12V automotive battery (with pre-regulation) for display controller and audio codec. IC Role / Device Role / Timing Role: Secondary buck stage after primary 5V regulator; provides clean, low-noise logic rail. Use Value: 1.4MHz operation avoids AM radio band; small SOT-23 footprint saves space on dense infotainment PCBs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1615ES6#TRMPBF | Same SOT-23-6 package, 1.25MHz freq, but 500mA switch; no BOOST pin - uses integrated MOSFET | Eliminates external BOOST diode/capacitor; lower VDS(on) improves light-load efficiency | Preferred where board area or component count reduction outweighs need for bipolar switch ruggedness |
| TPS62231DRYR | 3MHz synchronous buck, 400mA, 2.05–6.5V input; requires external compensation | Higher frequency enables smaller inductors; synchronous rectification improves full-load efficiency | Best for compact, high-efficiency designs with regulated 5V input; not suitable for 24V industrial inputs |
Compared with LT1616ES6#TRMPBF, LT1615ES6#TRMPBF simplifies design by removing BOOST components but sacrifices input voltage range (max 16V), while TPS62231DRYR offers higher efficiency and integration at the cost of input voltage limitation and reduced ruggedness against voltage transients.
Availability
LT1616ES6#TRMPBF is available at Aetrix Electronics and suitable for digital camera power supplies, battery-powered IoT sensor nodes, and industrial PLC I/O modules requiring stable component supply, long-lifecycle support, and consistent parametric performance across temperature.
Supply support for LT1616ES6#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 product lines with rigorous qualification and long-term manufacturing commitment.
The LT1616ES6#TRMPBF belongs to Linear's legacy high-voltage buck regulator family, designed specifically for industrial, medical, and portable equipment needing wide-input, ceramic-capacitor-compatible DC/DC conversion in minimal footprint.
FAQ
What is the absolute maximum input voltage rating for the LT1616ES6#TRMPBF?
The LT1616ES6#TRMPBF has an absolute maximum input voltage (VIN) rating of 25V. Exceeding this value risks permanent damage. The BOOST pin has a separate 35V absolute maximum rating, and the BOOST-to-SW differential must not exceed 25V. These limits are defined in the Absolute Maximum Ratings table and apply regardless of duration or duty cycle.
Can the LT1616ES6#TRMPBF operate with only ceramic capacitors on input and output?
Yes, the LT1616ES6#TRMPBF is explicitly designed for ceramic-capacitor-only operation. Its internally compensated current-mode architecture remains stable with low-ESR ceramics, enabling typical configurations with 1µF input and 10µF X5R/X7R output capacitors. This eliminates electrolytic aging concerns and reduces board area versus hybrid solutions.
What is the purpose of the BOOST pin on the LT1616ES6#TRMPBF, and what components are required?
The BOOST pin on the LT1616ES6#TRMPBF supplies gate drive voltage above VIN to fully saturate its internal bipolar NPN switch. It requires an external fast-switching diode (e.g., 1N4148) and capacitor (typically 0.01µF ceramic) connected between BOOST and SW pins. The BOOST voltage must exceed SW by ≥2.5V for optimal efficiency, especially at low output voltages.
Does the LT1616ES6#TRMPBF support adjustable output voltages, and how is it configured?
Yes, the LT1616ES6#TRMPBF supports adjustable output voltages via the FB pin. It regulates the FB node to 1.25V, so VOUT = 1.25V × (1 + R1/R2). A standard design uses R2 = 10kΩ and calculates R1 accordingly (e.g., 16.5kΩ for 3.3V). The feedback divider must connect directly between VOUT and GND, with FB tied to the R1–R2 junction.
How does the LT1616ES6#TRMPBF behave during output short-circuit conditions?
During output short-circuit, the LT1616ES6#TRMPBF enters frequency foldback mode: switching frequency drops from 1.4MHz to ~700kHz when FB voltage falls below 0.44V. This extends off-time, allowing the catch diode to reset inductor current and limiting average output current to ~300mA. Current limiting remains active, preventing device destruction under sustained short.
LT1616ES6#TRMPBF 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#TRMPBF FAQ
1.How can I place an order for LT1616ES6#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1616ES6#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 LT1616ES6#TRMPBF reliable?
The price and inventory of LT1616ES6#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1616ES6#TRMPBF is usually 5 days.
3.What payment methods are accepted for LT1616ES6#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1616ES6#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1616ES6#TRMPBF?
LT1616ES6#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1616ES6#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 LT1616ES6#TRMPBF?
For technical support, including LT1616ES6#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1616ES6#TRMPBF requirements.
6.How does Aetrix verify that LT1616ES6#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LT1616ES6#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 LT1616ES6#TRMPBF meets industry standards.
7.What is the process for return or replacement of LT1616ES6#TRMPBF?
All LT1616ES6#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1616ES6#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 LT1616ES6#TRMPBF part is unused and in its original packaging.
Return procedure for LT1616ES6#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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