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Analog Devices Inc. LTC1779ES6#TRMPBF
- Part No.:
- LTC1779ES6#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LTC1779ES6#TRMPBF.pdf
- Description:
- IC REG BUCK ADJ 250MA TSOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:168
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Product details
Overview
LTC1779ES6#TRMPBF from Analog Devices (formerly Linear Technology) is a constant-frequency current-mode step-down DC/DC converter in a 6-lead TSOT-23 package. It operates from 2.5V to 9.8V input, delivers up to 250mA output current, features ±2.5% output voltage accuracy, 550kHz switching frequency, and Burst Mode™ operation for high light-load efficiency. It is used in portable lithium-ion-powered systems requiring compact, low-quiescent-current regulation.
For engineers reviewing the LTC1779ES6#TRMPBF datasheet, LTC1779ES6#TRMPBF pinout, LTC1779ES6#TRMPBF application, or LTC1779ES6#TRMPBF equivalent, key selection criteria include input voltage range (2.5V–9.8V), peak output current capability (250mA), shutdown current (8µA), dropout behavior (100% duty cycle), and feedback reference voltage (0.8V ±2.5%).
Technical Context
The LTC1779ES6#TRMPBF implements current-mode control with an internal P-channel MOSFET, enabling precise line and load transient response. Its error amplifier drives the ITH/RUN pin to modulate peak inductor current via a voltage-controlled current comparator referenced to SENSE–.
It integrates undervoltage lockout (UVLO) triggering at ~2.0V (falling), overvoltage protection (OVP) at 7.5% above 0.8V VFB, thermal shutdown at 170°C, and foldback current limiting under short-circuit conditions. Burst Mode™ activates below ~0.85V on ITH/RUN to reduce quiescent current to 135µA while maintaining regulation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5V to 9.8V - supports single/dual Li-ion battery inputs and distributed 3.3V/2.5V rails. |
| Output Current | Up to 250mA - sufficient for powering baseband processors, RF front-ends, or sensor subsystems. |
| Switching Frequency | 550kHz fixed - enables use of small 22µH inductors and reduces EMI filtering burden. |
| Feedback Reference | 0.8V ±2.5% - allows programmable output voltages down to 0.8V using external resistor divider. |
| Quiescent Current | 135µA - minimizes battery drain in always-on portable applications. |
| Shutdown Current | 8µA - ensures ultra-low standby power during system sleep modes. |
| UVLO Threshold | 2.0V (falling) - prevents unstable operation near battery end-of-discharge. |
Pinout & Package
Package: 6-lead TSOT-23 (S6), 1mm profile, JEDEC MO-193 compliant, thermal resistance θJA = 230°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ITH/RUN (Pin 1) | Error amplifier output & run control | Sets peak current threshold; <0.325V forces shutdown; internal 0.5µA pull-up enables soft-start. |
| GND (Pin 2) | Power and signal ground reference | Common return path for VIN decoupling, feedback divider, and sense resistor. |
| VFB (Pin 3) | Feedback input to error amplifier | Compares divided output voltage against 0.8V reference to regulate output. |
| SENSE– (Pin 4) | Negative current-sense input | Connects to VIN or external resistor to set current limit; default config yields 250mA max. |
| VIN (Pin 5) | Main power input | Supplies internal circuitry and P-channel FET; requires local 0.1µF ceramic decoupling to GND. |
| SW (Pin 6) | Switch node / FET drain | Drives external inductor and catch diode; high dV/dt node requiring tight layout and minimal trace length. |
Key Features
| Feature | Design Value |
|---|---|
| Current-mode control | Enables fast transient response and inherent cycle-by-cycle current limiting without external sensing. |
| Burst Mode™ operation | Reduces quiescent current to 135µA at light loads while maintaining ±2.5% output regulation. |
| 100% duty-cycle dropout | Maintains regulation as VIN approaches VOUT by holding P-FET fully on-critical for battery longevity. |
| Integrated P-channel MOSFET | RDS(ON) = 0.85Ω (typ) at VIN = 4.2V - eliminates external high-side switch and simplifies BOM. |
| Accurate 0.8V reference | ±2.5% over –40°C to +85°C - enables stable low-voltage outputs (e.g., 1.8V, 2.5V) with minimal resistor tolerance impact. |
Applications
| Cellular Telephones | Wireless Modems |
|---|---|
Use Scenario: Powering baseband processor core voltage (1.8V) from a single Li-ion cell (3.0–4.2V). IC Role / Device Role / Timing Role: Primary step-down regulator delivering regulated 1.8V at up to 250mA with Burst Mode™ active during idle periods. Use Value: Extends talk time by minimizing no-load current to 135µA and maintains tight output accuracy (±2.5%) across battery discharge. | Use Scenario: Supplying 3.3V logic and RF section in LTE/5G USB dongles powered by host USB 5V or internal Li-ion. IC Role / Device Role / Timing Role: Efficient intermediate regulator converting 5V or 4.2V input to stable 3.3V output with 550kHz switching to ease EMI filtering. Use Value: Achieves up to 94% peak efficiency and supports rapid load transients from bursty data transmission without output droop. |
| Portable Computers | Distributed Power Systems |
Use Scenario: Generating 2.5V supply for USB controller or display interface IC in sub-notebook designs. IC Role / Device Role / Timing Role: Compact, low-profile (1mm) DC/DC converter in TSOT-23 package fitting tight board space constraints. Use Value: Enables direct integration near load with minimal PCB area; 8µA shutdown current preserves battery during suspend-to-RAM. | Use Scenario: Local point-of-load regulation for 1.8V FPGA I/O banks in industrial edge gateway with 3.3V backplane rail. IC Role / Device Role / Timing Role: Standalone buck converter providing isolated, accurate 1.8V from shared 3.3V supply with independent enable control via ITH/RUN. Use Value: Eliminates need for external current-sense resistor or compensation components-reduces BOM count and design validation effort. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62231DRVR | 3MHz fixed-frequency, 300mA output, 2.05V–6.5V input, 17µA IQ, 0.6V reference | Higher frequency enables smaller passives but less suitable for ultra-low-noise analog rails due to higher switching noise | Preferred when board space is critical and input voltage is ≤6.5V; not drop-in due to different pinout and reference voltage. |
| MAX17503GTA+T | High-efficiency synchronous buck, 4.5V–60V input, 600mA output, 100µA IQ, adjustable 0.8V reference | Wider VIN range and higher current support industrial 12V/24V rails but requires external MOSFETs and more complex layout | Selected for harsher environments or higher-power needs; not pin-compatible and demands full redesign. |
Compared with LTC1779ES6#TRMPBF, TPS62231DRVR offers higher switching frequency and lower quiescent current but lacks UVLO below 2.05V and requires different feedback network scaling; MAX17503GTA+T provides robust industrial-grade operation but increases solution size and cost significantly.
Availability
LTC1779ES6#TRMPBF is available at Aetrix Electronics and suitable for cellular telephones, wireless modems, and portable computers requiring stable component supply with guaranteed long-term availability and full traceability.
Supply support for LTC1779ES6#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 power management portfolio. Linear Technology was founded to deliver high-performance analog ICs with exceptional reliability and specification rigor.
The LTC1779 belongs to Linear's legacy monolithic DC/DC converter family, designed specifically for space-constrained, battery-powered applications demanding high efficiency, low IQ, and robust protection features across wide input ranges.
FAQ
What is the maximum output current supported by the LTC1779ES6#TRMPBF?
The LTC1779ES6#TRMPBF supports up to 250mA of continuous output current when configured with default SENSE– connection to VIN and operating within its specified input voltage range (2.5V–9.8V). Peak current capability depends on external inductor rating, thermal conditions, and duty cycle; actual sustained current may be lower under high ambient temperature or poor PCB thermal relief.
Does the LTC1779ES6#TRMPBF require an external current-sense resistor?
The LTC1779ES6#TRMPBF does not require an external current-sense resistor for basic 250mA operation - connecting SENSE– directly to VIN enables the default current limit. However, an external resistor between SENSE– and VIN can be used to reduce peak current for lower-power applications; the value is calculated per the formula in the datasheet based on desired ICL.
What is the purpose of the ITH/RUN pin on the LTC1779ES6#TRMPBF?
The ITH/RUN pin on the LTC1779ES6#TRMPBF serves dual functions: it acts as the error amplifier output for current-threshold control and as the enable/shutdown input. Pulling ITH/RUN below 0.325V disables the device (8µA shutdown current); releasing it allows internal 0.5µA charging for controlled soft-start. Its voltage directly sets the peak inductor current threshold.
Can the LTC1779ES6#TRMPBF operate in dropout mode, and how does it behave?
Yes, the LTC1779ES6#TRMPBF operates in dropout mode by sustaining 100% duty cycle on its internal P-channel MOSFET when VIN drops near VOUT. In this state, output voltage equals VIN minus IOUT × (RDS(ON) + RSENSE + RINDUCTOR), preserving regulation without oscillation or shutdown until UVLO triggers at ~2.0V.
What package type is used for the LTC1779ES6#TRMPBF, and what are its key mechanical features?
The LTC1779ES6#TRMPBF uses the 6-lead TSOT-23 (S6) package: ultra-thin (1.00mm max height), JEDEC MO-193 compliant, with 0.95mm pitch and 1.90mm × 2.80mm footprint. Its low thermal resistance (θJA = 230°C/W) and exposed pad-free construction simplify assembly and reflow, making it ideal for dense portable PCB layouts.
LTC1779ES6#TRMPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- SOT-23-6 Thin, TSOT-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):
- 2.5V
- Voltage - Input (Max):
- 9.8V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 9.8V
- Current - Output:
- 250mA
- Frequency - Switching:
- 100kHz ~ 550kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-6
LTC1779ES6#TRMPBF FAQ
1.How can I place an order for LTC1779ES6#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1779ES6#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 LTC1779ES6#TRMPBF reliable?
The price and inventory of LTC1779ES6#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1779ES6#TRMPBF is usually 5 days.
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We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1779ES6#TRMPBF transactions.
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4.How is shipping managed for LTC1779ES6#TRMPBF?
LTC1779ES6#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1779ES6#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 LTC1779ES6#TRMPBF?
For technical support, including LTC1779ES6#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1779ES6#TRMPBF requirements.
6.How does Aetrix verify that LTC1779ES6#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC1779ES6#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 LTC1779ES6#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC1779ES6#TRMPBF?
All LTC1779ES6#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1779ES6#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 LTC1779ES6#TRMPBF part is unused and in its original packaging.
Return procedure for LTC1779ES6#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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