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Analog Devices Inc. LTC1772HS6#TRPBF
- Part No.:
- LTC1772HS6#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LTC1772HS6#TRPBF.pdf
- Description:
- IC REG CTRLR MULT TOP SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:1,555
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Product details
Overview
LTC1772HS6#TRPBF from Analog Devices (formerly Linear Technology) is a constant-frequency, current-mode step-down DC/DC controller in a 6-lead SOT-23 package, designed to drive an external P-channel MOSFET for high-efficiency buck conversion. It delivers ±2.5% output voltage accuracy, operates from 2.5V to 9.8V input, supports 550kHz switching, and enables 100% duty-cycle dropout operation - ideal for lithium-ion-powered portable systems requiring stable low-voltage rails.
For engineers reviewing the LTC1772HS6#TRPBF datasheet, LTC1772HS6#TRPBF pinout, LTC1772HS6#TRPBF application, or LTC1772HS6#TRPBF equivalent, key selection criteria include its high-temperature rated –40°C to 140°C operation, Burst Mode™ efficiency optimization at light load, 0.8V internal reference enabling sub-1.8V outputs, UVLO threshold of 2.00V (typ), and gate drive capable of sourcing/sinking 1A peak for fast P-MOSFET switching.
Technical Context
The LTC1772HS6#TRPBF implements a current-mode control architecture with slope compensation above 40% duty cycle, using an external sense resistor to monitor inductor current. Its oscillator operates at a fixed 550kHz (typ) when VFB = 0.8V, dropping to ~120kHz under short-circuit protection to limit inductor current runaway.
Control logic includes a dedicated ITH/RUN pin that serves dual roles: error amplifier output and run/shutdown control (0.35V threshold), while overvoltage protection triggers at 7.5% above 0.8V reference (0.860V typ) with 20mV hysteresis. The device integrates undervoltage lockout, burst mode sleep control, and foldback current limiting support via external diodes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5V to 9.8V - supports single/dual Li-ion battery inputs without pre-regulation |
| Switching Frequency | 550kHz (typ) - enables compact 4.7µH inductors and reduces EMI filtering burden |
| Reference Voltage | 0.800V (±2.5%) - sets precise output via external resistor divider; allows 1.8V/2.5V/3.3V rails |
| Quiescent Current | 270µA (typ) - minimizes standby power loss in battery-operated devices |
| Shutdown Current | 8µA (typ) - extends battery life during system sleep modes |
| Operating Temp Range | –40°C to +140°C - qualified for automotive under-hood and industrial high-temp environments |
| UVLO Threshold | 2.00V (typ, falling) - prevents unstable regulation during brownout or battery depletion |
| Peak Gate Drive Current | 1A - ensures fast turn-on/turn-off of P-MOSFETs with low RDS(on) and high Ciss |
Pinout & Package
The LTC1772HS6#TRPBF is housed in a 6-lead plastic TSOT-23 package (JEDEC MO-193), measuring 2.90mm × 1.60mm × 0.85mm, with exposed pad not electrically connected. Pin 1 is marked by a dot; pin numbering follows standard SOT-23 top-view orientation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ITH/RUN (Pin 1) | Error amplifier output & shutdown control | Drives external compensation network; pulling below 0.35V disables regulator and holds PGATE high |
| GND (Pin 2) | Analog and power ground reference | Common return for feedback, sense, and gate drive paths; must be low-impedance |
| VFB (Pin 3) | Feedback input to error amplifier | Compares output voltage (via resistive divider) against 0.8V reference; high-impedance (≤50nA bias) |
| SENSE– (Pin 4) | Negative current-sense comparator input | Monitors voltage drop across external RSENSE; used with VIN to detect inductor peak current |
| VIN (Pin 5) | Main power supply input | Supplies internal circuitry and gate driver; requires local 0.1µF ceramic decoupling to GND |
| PGATE (Pin 6) | High-side P-MOSFET gate driver output | Swings from 0V to VIN; delivers 1A peak current with 40ns rise/fall times into 3000pF load |
Key Features
| Feature | Design Value |
|---|---|
| Constant-frequency current-mode control | Ensures predictable EMI profile and stable loop response across line/load transients |
| Burst Mode™ operation | Reduces quiescent current to 230µA (sleep mode) and maintains >85% efficiency at 1mA load |
| 100% duty-cycle dropout | Enables VOUT regulation down to VIN – (IOUT × RDS(on) + IOUT × RSENSE) - critical for battery end-of-life operation |
| Integrated overvoltage protection | Shuts off PGATE when VFB exceeds 0.860V (typ); 20mV hysteresis prevents chatter during recovery |
| Wide temperature grade (H-grade) | Guaranteed performance from –40°C to +140°C junction - suitable for engine control units and industrial PLCs |
| Low-threshold UVLO | 2.00V (typ) shutdown prevents erratic behavior during Li-ion discharge below 3.0V/cell |
Applications
| Automotive Body Control Module | Industrial Handheld Scanner |
|---|---|
Use Scenario: Powering 3.3V microcontroller, CAN transceiver, and sensor interface in under-hood BCM housing. IC Role / Device Role / Timing Role: Primary step-down controller generating regulated 3.3V rail from 7V–16V vehicle battery (with cold-crank tolerance down to 4.5V). Use Value: H-grade rating ensures reliable operation at 140°C ambient; 550kHz switching allows small 4.7µH inductor and low-profile layout. | Use Scenario: Supplying 2.5V core voltage to ARM-based SoC and 1.8V I/O rail in ruggedized barcode scanner. IC Role / Device Role / Timing Role: High-efficiency buck controller driving Fairchild FDC638P P-MOSFET to convert 3.6V Li-ion to dual low-voltage rails. Use Value: Burst Mode™ achieves >90% efficiency at 5mA standby; ±2.5% reference accuracy maintains SoC stability across temperature. |
| Portable Medical Pulse Oximeter | Wireless IoT Sensor Node |
Use Scenario: Generating stable 1.8V analog front-end supply from single 3.7V Li-ion cell in battery-powered oximeter. IC Role / Device Role / Timing Role: Current-mode buck controller with 0.8V reference enabling precise 1.8V output via 80.6k/100k resistor divider. Use Value: 270µA quiescent current extends runtime; 100% duty-cycle operation sustains output until battery drops to 2.0V. | Use Scenario: Powering ultra-low-power MCU, BLE radio, and environmental sensors in coin-cell or Li-ion–powered edge node. IC Role / Device Role / Timing Role: Step-down controller operating in Burst Mode™ to maintain >88% efficiency at 100µA load while drawing only 8µA in shutdown. Use Value: Shutdown current of 8µA (typ) enables multi-year battery life; SOT-23 footprint saves PCB area in space-constrained designs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC1622CGN#PBF | 8-lead MSOP; supports N-channel MOSFET drive; synchronizable to 750kHz; lower min VIN (2V) | Requires external bootstrap circuitry; better suited for higher-current (>2A) or sync-capable designs | Select when needing N-MOSFET efficiency gains or synchronization to system clock |
| TPS54202DRCT | Integrated 28mΩ N-MOSFET; 4.5–17V input; 2A output; no external sense resistor needed | Higher integration eliminates RSENSE and external MOSFET but limits max output current and thermal design flexibility | Choose for simplified BOM and faster time-to-market where 2A output suffices and thermal headroom permits |
Compared with LTC1772HS6#TRPBF, LTC1622CGN#PBF offers higher integration and frequency flexibility but requires more board space and external gate drive components, while TPS54202DRCT trades design flexibility for ease of use and lower component count - making LTC1772HS6#TRPBF optimal for thermally demanding, high-reliability, or cost-sensitive discrete-P-MOSFET implementations.
Availability
LTC1772HS6#TRPBF is available at Aetrix Electronics and suitable for automotive body electronics, industrial handheld scanners, portable medical devices, wireless IoT nodes, and high-temperature embedded systems requiring stable component supply and long-term lifecycle assurance.
Supply support for LTC1772HS6#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, Inc. (ADI) acquired Linear Technology in 2017 and continues to develop, manufacture, and support its precision analog and power management portfolio.
The LTC1772HS6#TRPBF belongs to Linear's legacy high-efficiency DC/DC controller family, engineered specifically for compact, battery-powered applications demanding wide input range, low quiescent current, and robust thermal performance.
FAQ
What is the maximum junction temperature specification for the LTC1772HS6#TRPBF?
The LTC1772HS6#TRPBF is rated for a maximum junction temperature of 150°C and is guaranteed to operate over a junction temperature range of –40°C to +140°C. This H-grade qualification makes it suitable for under-hood automotive and high-ambient industrial environments where thermal derating is critical. The θJA value is 230°C/W, so proper PCB copper pour and thermal vias are recommended to maintain safe operating temperatures at full load.
Does the LTC1772HS6#TRPBF support synchronous rectification?
No, the LTC1772HS6#TRPBF does not support synchronous rectification. It is designed exclusively to drive an external P-channel MOSFET as the high-side switch, with an external Schottky diode (e.g., MBRM120T3) serving as the low-side rectifier. Synchronous operation would require an N-channel driver with bootstrap or isolated gate drive - functionality not integrated into the LTC1772HS6#TRPBF architecture.
What is the purpose of the ITH/RUN pin on the LTC1772HS6#TRPBF?
The ITH/RUN pin on the LTC1772HS6#TRPBF serves two critical functions: it acts as the output of the internal error amplifier (for loop compensation via external RC network) and as the run/shutdown control input. Pulling this pin below 0.35V disables the controller and forces PGATE high, entering shutdown mode with only 8µA supply current. During normal operation, its voltage (0.7V–1.9V range) sets the peak inductor current threshold via the current comparator.
Can the LTC1772HS6#TRPBF be used with input voltages below 2.5V?
The absolute minimum input voltage for functional operation of the LTC1772HS6#TRPBF is specified as 2.5V in the Electrical Characteristics table. While the device may exhibit some activity near 2.0V due to UVLO hysteresis, regulation is not guaranteed below 2.5V, and output accuracy, efficiency, and transient response degrade significantly. For sub-2.5V applications, consider alternatives like the LTC1622 (2V min VIN) or LTC1735.
How does Burst Mode™ operation improve light-load efficiency in the LTC1772HS6#TRPBF?
Burst Mode™ operation in the LTC1772HS6#TRPBF improves light-load efficiency by disabling switching cycles when output demand falls below a threshold. When the ITH/RUN voltage drops below 0.85V, the controller enters sleep mode - turning off PGATE and reducing supply current to 230µA (typ). It resumes normal 550kHz operation only when ITH/RUN rises above 0.925V, minimizing switching losses and gate drive energy at loads under ~10mA.
LTC1772HS6#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
- Output Type:
- Transistor Driver
- Function:
- Step-Up, Step-Down, Step-Up/Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck, Boost, Flyback
- Number of Outputs:
- 1
- Output Phases:
- 1
- Voltage - Supply (Vcc/Vdd):
- 2.5V ~ 9.8V
- Frequency - Switching:
- 550kHz
- Duty Cycle (Max):
- 100%
- Synchronous Rectifier:
- No
- Clock Sync:
- No
- Serial Interfaces:
- -
- Control Features:
- Enable
- Operating Temperature:
- -40°C ~ 140°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-6
LTC1772HS6#TRPBF FAQ
1.How can I place an order for LTC1772HS6#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1772HS6#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 LTC1772HS6#TRPBF reliable?
The price and inventory of LTC1772HS6#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1772HS6#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1772HS6#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1772HS6#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1772HS6#TRPBF?
LTC1772HS6#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1772HS6#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 LTC1772HS6#TRPBF?
For technical support, including LTC1772HS6#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1772HS6#TRPBF requirements.
6.How does Aetrix verify that LTC1772HS6#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1772HS6#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 LTC1772HS6#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1772HS6#TRPBF?
All LTC1772HS6#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1772HS6#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 LTC1772HS6#TRPBF part is unused and in its original packaging.
Return procedure for LTC1772HS6#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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