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Analog Devices Inc. LTC1779ES6#TRPBF
- Part No.:
- LTC1779ES6#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LTC1779ES6#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 250MA TSOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:2,249
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Product details
Overview
LTC1779ES6#TRPBF 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 fixed switching frequency, and Burst Mode™ operation for high light-load efficiency-used in portable lithium-ion-powered systems requiring compact, low-quiescent-power regulation.
For engineers reviewing the LTC1779ES6#TRPBF datasheet, LTC1779ES6#TRPBF pinout, LTC1779ES6#TRPBF application, or LTC1779ES6#TRPBF equivalent, key selection criteria include input voltage range (2.5V–9.8V), peak output current capability (250mA), dropout behavior (100% duty cycle), feedback reference voltage (0.8V), and shutdown current (8µA).
Technical Context
The LTC1779ES6#TRPBF implements current-mode control with an internal P-channel MOSFET, using peak inductor current sensing referenced to the SENSE– pin. Its error amplifier drives the ITH/RUN pin to modulate current limit threshold, enabling precise load and line transient response.
It integrates undervoltage lockout (UVLO) triggering at ~2.0V falling input, overvoltage protection (OVP) at 7.5% above 0.8V reference, thermal shutdown at 170°C, and foldback current limiting under short-circuit conditions-ensuring robust operation in battery-powered environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5V to 9.8V - supports single/dual Li-ion, NiMH, or regulated 3.3V/5V rails without external LDO pre-regulation. |
| Output Current | Up to 250mA - sufficient for powering microcontrollers, RF transceivers, or sensor interfaces in space-constrained designs. |
| Switching Frequency | 550kHz (typ.) - enables use of small 22µH inductors and ceramic output capacitors, reducing board area. |
| Feedback Reference | 0.8V ±2.5% - allows precise programmable output voltages down to 0.8V via external resistor divider. |
| Quiescent Current | 135µA (normal), 8µA (shutdown) - extends battery life in always-on or low-duty-cycle portable devices. |
| Burst Mode Efficiency | Up to 94% at 100mA - maintains high conversion efficiency across wide load range, critical for energy-sensitive applications. |
| RDS(ON) | 0.85Ω (typ., VIN = 4.2V) - minimizes conduction loss during high-current pulses and dropout operation. |
Pinout & Package
Package: 6-lead TSOT-23 (S6), 1mm profile, JEDEC MO-193 compliant - optimized for high-density portable PCB layouts with minimal footprint (approx. 2.9mm × 1.6mm).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ITH/RUN (Pin 1) | Error amplifier output & run control input | Modulates current limit threshold; pulling below 0.325V forces shutdown; internal 0.5µA current source enables soft-start on release. |
| GND (Pin 2) | Power and signal ground reference | Must be low-impedance connection to minimize noise coupling into feedback and current sense paths. |
| VFB (Pin 3) | Feedback voltage input | Compares divided output voltage against 0.8V reference; requires direct routing from output divider to avoid noise-induced regulation error. |
| SENSE– (Pin 4) | Negative current sense input | Connected to VIN for default 250mA limit; adding external resistor between SENSE– and VIN lowers peak current threshold. |
| VIN (Pin 5) | Input power supply | Requires local 0.1µF ceramic decoupling to GND; high di/dt path mandates short, wide traces to reduce EMI and voltage spikes. |
| SW (Pin 6) | Switch node / MOSFET drain | Drives external inductor and catch diode; high dv/dt node must be routed away from analog signals and minimized in loop area. |
Key Features
| Feature | Design Value |
|---|---|
| Current-mode control architecture | Delivers superior line and load transient response without external compensation components beyond ITH/RUN network. |
| Burst Mode™ operation | Reduces quiescent current to ~135µA while maintaining regulation at light loads, improving average efficiency in intermittent-use devices. |
| 100% duty cycle dropout | Enables seamless transition to linear regulation as input approaches output voltage, preserving output stability without external circuitry. |
| Integrated UVLO and OVP | Prevents unsafe operation below 2.0V input and limits output overshoot to ≤7.5% of setpoint, eliminating need for discrete protection ICs. |
| Low-profile TSOT-23 package | 1mm height allows integration into ultra-thin handhelds, wearables, and modules where Z-height is constrained. |
Applications
| Wireless Modem Power Supply | Portable Computer Core Logic Rail |
|---|---|
Use Scenario: Powers baseband processor and RF front-end in 3G/4G LTE modems operating from single-cell Li-ion (3.0V–4.2V). IC Role / Device Role / Timing Role: Primary step-down regulator delivering stable 1.8V or 2.5V at up to 250mA with fast load transient recovery. Use Value: Burst Mode™ ensures <135µA quiescent draw during idle states, extending standby time; 550kHz switching enables compact 22µH inductor + ceramic capacitor solution. | Use Scenario: Supplies I/O or auxiliary logic rails in sub-notebook or tablet platforms with tight board space and thermal constraints. IC Role / Device Role / Timing Role: Secondary DC/DC converter generating 3.3V or 2.5V from main system rail, supporting USB controllers or display interface ICs. Use Value: TSOT-23 footprint saves >40% area vs. SO-8 alternatives; 100% duty cycle operation maintains regulation during brownout events without system reset. |
| Cellular Telephone Application Processor | Distributed Low-Voltage Power System |
Use Scenario: Regulates core voltage for ARM-based application processors in smartphones powered by dual-cell Li-ion (6.0V–8.4V). IC Role / Device Role / Timing Role: High-efficiency buck converter delivering 1.2V or 1.35V at up to 250mA with ±2.5% accuracy over temperature. Use Value: 0.8V reference enables accurate low-voltage outputs; ±2.5% VREF tolerance ensures consistent processor performance across –40°C to 85°C ambient. | Use Scenario: Provides localized 1.8V or 2.5V rails in industrial IoT gateways with distributed power architecture and multiple isolated subsystems. IC Role / Device Role / Timing Role: Point-of-load regulator converting 5V or 3.3V backplane voltage to lower logic supply, minimizing IR drop and noise coupling. Use Value: 550kHz fixed frequency simplifies EMI filtering; low 8µA shutdown current supports remote wake-up functionality with minimal battery drain. |
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 switching frequency, 300mA output, 2.05V–6.5V input, 1.5% reference accuracy | Higher frequency enables smaller passives but increases switching loss at high VIN; tighter reference improves precision ADC biasing | Preferred when board space is extremely limited and input voltage stays below 6.5V |
| MAX17503GCU+T | 2.5V–40V input, 600mA output, adjustable frequency (200kHz–2.2MHz), external MOSFETs | Wider VIN range and higher current suit harsher environments; external FETs allow thermal separation and custom RDS(ON) | Chosen for industrial or automotive applications requiring extended input range and field-replaceable power stage |
Compared with LTC1779ES6#TRPBF, TPS62231DRVR offers higher integration and precision at the cost of reduced input voltage headroom, while MAX17503GCU+T provides ruggedness and scalability but demands more design effort and board area.
Availability
LTC1779ES6#TRPBF is available at Aetrix Electronics and suitable for wireless modems, portable computers, and cellular telephones requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LTC1779ES6#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 continues its legacy of high-performance analog and power management ICs with rigorous reliability testing and automotive-grade qualification pathways.
The LTC1779ES6#TRPBF belongs to Linear's ThinSOT™ DC/DC converter family, designed specifically for space-constrained, battery-powered applications demanding high efficiency, low quiescent current, and robust protection features.
FAQ
What is the maximum output current capability of the LTC1779ES6#TRPBF?
The LTC1779ES6#TRPBF delivers up to 250mA of continuous output current when configured with SENSE– tied directly to VIN. This rating assumes proper thermal management, appropriate inductor selection (e.g., 22µH), and operation within the specified input voltage range (2.5V–9.8V). Peak current is limited by internal sensing and can be reduced via external resistor on SENSE–.
Does the LTC1779ES6#TRPBF support adjustable output voltage?
Yes, the LTC1779ES6#TRPBF supports fully adjustable output voltage using an external resistor divider connected to the VFB pin. With a precise 0.8V internal reference, output voltage is calculated as VOUT = 0.8V × (1 + R2/R1). For example, using R1 = 80kΩ and R2 = 120kΩ yields a 2.0V output. Layout best practices require placing R1/R2 close to VFB to minimize noise pickup.
What protection features are integrated into the LTC1779ES6#TRPBF?
The LTC1779ES6#TRPBF integrates undervoltage lockout (UVLO) that disables operation below ~2.0V input, overvoltage protection (OVP) triggered at 7.5% above the 0.8V reference, thermal shutdown at 170°C, and foldback current limiting during output short-circuit conditions-all without requiring external components.
How does Burst Mode™ operation improve efficiency in the LTC1779ES6#TRPBF?
Burst Mode™ operation in the LTC1779ES6#TRPBF reduces switching activity at light loads by pulsing full switching cycles only when needed to maintain regulation, dropping quiescent current to 135µA. This significantly improves average efficiency in battery-powered devices with intermittent load profiles, such as Bluetooth modules or sensor nodes in sleep-wake cycles.
What is the recommended PCB layout practice for the SW pin of the LTC1779ES6#TRPBF?
The SW pin of the LTC1779ES6#TRPBF is a high-di/dt node connecting to the inductor and catch diode. Recommended layout practice requires minimizing the loop area formed by SW → inductor → diode → GND → VIN → LTC1779ES6#TRPBF, using short/wide copper traces, placing the input capacitor (0.1µF ceramic) directly between VIN and GND pins, and routing SW away from sensitive analog nodes like VFB or ITH/RUN to prevent coupling noise into regulation.
LTC1779ES6#TRPBF 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#TRPBF FAQ
1.How can I place an order for LTC1779ES6#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1779ES6#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 LTC1779ES6#TRPBF reliable?
The price and inventory of LTC1779ES6#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1779ES6#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1779ES6#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1779ES6#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1779ES6#TRPBF?
LTC1779ES6#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1779ES6#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 LTC1779ES6#TRPBF?
For technical support, including LTC1779ES6#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1779ES6#TRPBF requirements.
6.How does Aetrix verify that LTC1779ES6#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1779ES6#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 LTC1779ES6#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1779ES6#TRPBF?
All LTC1779ES6#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1779ES6#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 LTC1779ES6#TRPBF part is unused and in its original packaging.
Return procedure for LTC1779ES6#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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