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Analog Devices Inc. LTC1772HS6#TRMPBF
- Part No.:
- LTC1772HS6#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LTC1772HS6#TRMPBF.pdf
- Description:
- IC REG CTRLR MULT TOP SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:300
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Product details
Overview
LTC1772HS6#TRMPBF from Analog Devices (formerly Linear Technology) is a constant-frequency, current-mode step-down DC/DC controller in SOT-23 packaging, 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 100% duty cycle in dropout, and achieves up to 94% efficiency in portable lithium-ion-powered systems.
For engineers reviewing the LTC1772HS6#TRMPBF datasheet, LTC1772HS6#TRMPBF pinout, LTC1772HS6#TRMPBF application, or LTC1772HS6#TRMPBF equivalent, key selection criteria include its –40°C to 140°C operating temperature range, 550kHz fixed switching frequency, Burst Mode® operation for light-load efficiency, 0.8V reference enabling low-output-voltage designs, and UVLO threshold of 2.00V (typical) with hysteresis.
Technical Context
The LTC1772HS6#TRMPBF implements peak current-mode control with a 550kHz oscillator and internal slope compensation above 40% duty cycle to ensure loop stability. Its error amplifier drives the ITH/RUN pin, which sets the current comparator threshold and enables soft-start via external RC network.
It integrates undervoltage lockout (UVLO), overvoltage protection (OVP) at VFB > 0.860V (7.5% above 0.8V reference), short-circuit foldback (reducing frequency to ~120kHz), and shutdown control via ITH/RUN < 0.35V - all while consuming only 8µA in shutdown and 270µA quiescent current during normal operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Operating Temp Range | –40°C to +140°C (guaranteed performance, junction-limited) |
| Input Voltage Range | 2.5V to 9.8V - supports single/dual Li-ion, wide-input portable rails |
| Switching Frequency | 550kHz (typical) - enables compact 4.7µH inductors and low-profile designs |
| Reference Voltage | 0.800V (±2.5%) - sets output via resistive divider; enables 1.8V/2.5V/3.3V outputs |
| Quiescent Current | 270µA (typical) - minimizes battery drain in active mode |
| Shutdown Current | 8µA (typical) - extends shelf life and standby time in battery systems |
| UVLO Threshold | 2.00V (typical, falling) - prevents erratic startup below safe Li-ion cell voltage |
| Peak Sense Voltage | 120mV - defines current limit; sets RSENSE for precise output current capability |
Pinout & Package
Package: 6-lead TSOT-23 (S6), 1.90mm × 2.80mm footprint, 0.95mm height, lead-free (PBF) compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ITH/RUN (Pin 1) | Error amplifier output & run control | Drives external compensation network; <0.35V forces shutdown; 0.7–1.9V sets current limit |
| GND (Pin 2) | Power and signal ground reference | Common return for VIN decoupling, sense resistor, and feedback divider |
| VFB (Pin 3) | Feedback input to error amplifier | Compares output voltage (via R1/R2 divider) against 0.8V reference |
| SENSE– (Pin 4) | Negative current-sense input | Monitors voltage drop across external RSENSE to detect peak inductor current |
| VIN (Pin 5) | Main power supply input | Supplies internal circuitry and gate driver; must be decoupled near Pin 2 |
| PGATE (Pin 6) | P-channel MOSFET gate driver output | Swings 0V to VIN; drives external high-side P-MOSFET with 40ns rise/fall times |
Key Features
| Feature | Design Value |
|---|---|
| Constant-frequency current-mode control | Ensures predictable EMI profile and stable transient response across line/load variations |
| Burst Mode® operation | Maintains >85% efficiency at 1mA load by gating switching cycles, reducing quiescent loss |
| 100% duty-cycle dropout | Enables regulation down to VOUT = VIN − (RDS(ON) + RSENSE) × IOUT without losing control |
| Integrated OVP and UVLO | Protects downstream circuitry from overvoltage transients and prevents operation below safe battery voltage |
| Low-temperature drift reference | 0.8V reference varies <±15mV over –40°C to +140°C - critical for automotive/harsh-environment reliability |
| High-temp qualified package | S6 TSOT-23 rated for 140°C junction - suitable for under-hood or enclosed industrial applications |
Applications
| Portable Li-ion Power Supply | Industrial Sensor Node |
|---|---|
Use Scenario: Powering 1.8V/2.5V logic and RF ICs in handheld medical devices or barcode scanners using two-series Li-ion cells (6.0–8.4V). IC Role / Device Role / Timing Role: Step-down controller regulating stable low-voltage rail; no timing function - pure power conversion. Use Value: Burst Mode® extends battery runtime by 3× vs continuous mode at microamp loads; 140°C rating ensures reliability in sealed enclosures. | Use Scenario: Providing 3.3V supply to wireless sensor transceivers (e.g., LoRaWAN nodes) deployed in hot industrial environments. IC Role / Device Role / Timing Role: High-temp DC/DC controller driving external P-MOSFET; handles wide VIN (3.3–9.8V) from backup supercaps or solar harvesters. Use Value: Guaranteed operation to +140°C eliminates derating; 550kHz frequency allows small 10µH inductor and ceramic output caps for vibration resistance. |
| Automotive Body Control Module | Distributed 2.5V System Rail |
Use Scenario: Generating 2.5V for CAN transceiver bias and microcontroller I/O in non-junction-box locations (e.g., door modules). IC Role / Device Role / Timing Role: Primary buck controller; interfaces with external MOSFET and Schottky diode - no clock generation or timing role. Use Value: UVLO at 2.0V prevents brownout during cranking; 100% duty cycle maintains output during cold-cranking dips to 6V battery. | Use Scenario: Local point-of-load regulation for FPGA I/O banks or DDR memory termination in telecom baseband cards. IC Role / Device Role / Timing Role: Standalone step-down controller delivering 2.5V/2A with minimal external components. Use Value: 0.8V reference enables precise 2.5V output via 80.6k/10k divider; 94% peak efficiency reduces thermal load on dense PCBs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC1622CMS8#PBF | 8-lead MSOP; supports sync-to-external clock; wider VIN (2V–10V); higher max IOUT (4.5A) | Requires larger layout; lacks 140°C rating (only –40°C to 85°C); no Burst Mode® | Choose for higher current or synchronization needs; not drop-in due to package and feature mismatch. |
| LTC3630EMSE#PBF | Monolithic 2A buck regulator (integrated MOSFETs); 3.6V–15V VIN; 1MHz switching | No external FET required; smaller BOM but higher thermal density; lower max temp (125°C) | Prefer for space-constrained designs where integration outweighs thermal/temperature trade-offs. |
Compared with LTC1772HS6#TRMPBF, LTC1622CMS8#PBF offers higher current capability but sacrifices high-temperature operation and light-load efficiency, while LTC3630EMSE#PBF simplifies design with integrated switches yet limits maximum ambient temperature and requires different thermal management.
Availability
LTC1772HS6#TRMPBF is available at Aetrix Electronics and suitable for portable medical devices, industrial sensor nodes, automotive body electronics, and distributed 2.5V/3.3V power systems requiring stable component supply across extended temperature ranges.
Supply support for LTC1772HS6#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 full product support, documentation, and qualification for legacy Linear parts including the LTC series.
The LTC1772 belongs to Linear's high-efficiency DC/DC controller family, engineered for battery-powered and thermally constrained applications where precision regulation, low quiescent current, and extended temperature operation are critical.
FAQ
What is the guaranteed operating temperature range for the LTC1772HS6#TRMPBF?
The LTC1772HS6#TRMPBF is guaranteed to meet all electrical specifications over –40°C to +140°C ambient temperature, with junction temperature limited to 150°C. This H-grade qualification makes it suitable for under-hood automotive, industrial, and harsh-environment applications where standard commercial or industrial grades would fail.
Does the LTC1772HS6#TRMPBF integrate power MOSFETs or require external ones?
The LTC1772HS6#TRMPBF is a controller-only device and requires an external P-channel MOSFET (e.g., Fairchild FDC638P or Si3443DV) and Schottky catch diode. It does not integrate any power switches - this architecture enables optimized thermal design, high-current scalability, and flexibility in selecting FETs for specific RDS(ON) and gate charge requirements.
How does Burst Mode® operation improve efficiency in the LTC1772HS6#TRMPBF?
Burst Mode® operation in the LTC1772HS6#TRMPBF disables switching cycles when load current falls below a threshold, reducing gate drive and bias losses. At 1mA load, it sustains >85% efficiency - significantly outperforming forced continuous mode (which drops to ~40%). This directly extends battery life in intermittently active devices like remote sensors or wearables.
Can the LTC1772HS6#TRMPBF regulate output voltages below 1.8V?
Yes - the LTC1772HS6#TRMPBF uses a precise 0.8V internal reference, so output voltage is set by VOUT = 0.8V × (1 + R1/R2). With appropriate resistor ratios and low-drift components, it reliably regulates down to 0.8V (e.g., 0.8V × (1 + 0/∞)) or any value above, provided external components (MOSFET, inductor, diode) support the required current and voltage headroom.
What is the purpose of the SENSE– pin on the LTC1772HS6#TRMPBF?
The SENSE– pin (Pin 4) is the negative input to the internal current comparator. It monitors the voltage drop across an external sense resistor (RSENSE) placed between the source of the P-MOSFET and ground. When that voltage reaches 120mV (typical), the comparator triggers MOSFET turn-off - enabling accurate peak-current-mode control and overcurrent protection in the LTC1772HS6#TRMPBF.
LTC1772HS6#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
- 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#TRMPBF FAQ
1.How can I place an order for LTC1772HS6#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1772HS6#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 LTC1772HS6#TRMPBF reliable?
The price and inventory of LTC1772HS6#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1772HS6#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC1772HS6#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1772HS6#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1772HS6#TRMPBF?
LTC1772HS6#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1772HS6#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 LTC1772HS6#TRMPBF?
For technical support, including LTC1772HS6#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1772HS6#TRMPBF requirements.
6.How does Aetrix verify that LTC1772HS6#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC1772HS6#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 LTC1772HS6#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC1772HS6#TRMPBF?
All LTC1772HS6#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1772HS6#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 LTC1772HS6#TRMPBF part is unused and in its original packaging.
Return procedure for LTC1772HS6#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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