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Analog Devices Inc. LTC3772ETS8#TRPBF
- Part No.:
- LTC3772ETS8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- SOT-23-8 Thin, TSOT-23-8
- Datasheet:
-
LTC3772ETS8#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK TSOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:2,628
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Product details
Overview
LTC3772ETS8#TRPBF from Analog Devices (formerly Linear Technology) is a micropower, constant-frequency current-mode step-down DC/DC controller in an 8-lead TSOT-23 package. It operates from 2.75V to 9.8V input, delivers output as low as 0.8V with ±1.5% reference accuracy, and achieves 550kHz switching without external current-sense resistors-enabling high-efficiency power conversion in space-constrained Li-ion–powered portable systems.
For engineers reviewing the LTC3772ETS8#TRPBF datasheet, LTC3772ETS8#TRPBF pinout, LTC3772ETS8#TRPBF application, or LTC3772ETS8#TRPBF equivalent, key selection considerations include its No RSENSE™ architecture, 40µA no-load quiescent current, 100% duty-cycle dropout operation, ITH/RUN-controlled soft-start and shutdown, and IPRG-selectable peak current thresholds (105mV/175mV/245mV) for P-channel MOSFET gate drive.
Technical Context
The LTC3772ETS8#TRPBF implements current-mode control using internal slope compensation and a 550kHz oscillator, enabling stable regulation across wide VIN/VOUT ratios. Its error amplifier output (ITH/RUN) directly sets peak inductor current while serving as run/shutdown control and soft-start ramp target.
Burst Mode® operation engages below ~10% load, clamping ITH/RUN at 0.925V and reducing quiescent current to 40µA; undervoltage lockout disables all circuitry below 2.0V (rising), and short-circuit protection folds oscillator frequency to 200kHz while maintaining minimum on-time.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.75V to 9.8V - supports single/dual Li-ion battery stacks and intermediate bus rails without external LDO pre-regulation. |
| Switching Frequency | 550kHz (typ) - enables use of compact 2.2µH–4.7µH inductors and low-ESR ceramic output capacitors. |
| Feedback Reference | 0.800V ±1.5% - sets output voltage via resistor divider; line/load regulation ≤0.2mV/V and ≤0.2% ensures stability across operating conditions. |
| No-Load Quiescent Current | 40µA - minimizes battery drain in standby, extending runtime in always-on wireless sensors and portable computing. |
| Shutdown Current | 8µA - allows deep sleep mode activation via ITH/RUN pin <0.6V, critical for energy-harvesting and ultra-low-power IoT nodes. |
| Peak Current Sense Threshold | 105mV / 175mV / 245mV (IPRG = GND / float / VIN) - configures maximum inductor current without sense resistor, matching RDS(ON) of external P-MOSFET. |
| Soft-Start Time | 0.6ms - linear VFB ramp prevents inrush current and output overshoot during cold start in FPGA or microprocessor core rails. |
Pinout & Package
Package: 8-lead TSOT-23 (0.65mm pitch, 2.9mm × 1.6mm × 1.0mm height), RoHS-compliant, exposed pad not present (DDB variant has exposed pad; TS8 does not).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IPRG | Current limit select input | Three-state logic pin (GND/float/VIN) setting peak sense voltage threshold for P-MOSFET overcurrent protection. |
| ITH/RUN | Error amp output & enable control | Drives external compensation network; <0.6V forces shutdown; >0.7V enables regulation; internal 1µA pull-up enables soft-start. |
| VFB | Feedback input | Monitors resistor-divider output voltage; compared to 0.8V reference to regulate VOUT; input bias current ±10nA minimizes divider error. |
| GND | Analog and power ground | Common return for feedback, error amp, and internal regulators; must be low-impedance connection to minimize noise coupling. |
| NC | No connection | Pin 8 is unconnected internally; must remain floating-no PCB trace or solder mask opening required. |
| SW | Switch node | Connects to P-MOSFET drain and inductor; carries high di/dt switching waveform; requires tight layout to reduce EMI and gate drive ringing. |
| VIN | Power supply & current sense input | Supplies internal circuitry and provides current sense path (VIN–SW) for P-MOSFET RDS(ON)-based sensing; requires local 10µF ceramic bypass. |
| PGATE | P-channel MOSFET gate driver | Push-pull output swinging 0V to VIN; drives gate capacitance up to 3000pF with 40ns rise/fall times; designed for sublogic-level P-MOSFETs. |
Key Features
| Feature | Design Value |
|---|---|
| No RSENSE™ architecture | Eliminates external current-sense resistor, reducing BOM count, board area, and conduction losses-critical for thermally constrained handheld devices. |
| Low-ripple Burst Mode® | Maintains <10mVpp output ripple at light loads by clamping ITH/RUN and disabling switching cycles-not just skipping pulses-preserving transient response. |
| 100% duty-cycle dropout | Extends usable battery life by sustaining regulation down to VOUT + VDS(ON) of P-MOSFET, avoiding premature system brownout during battery discharge. |
| Internal soft-start ramp | 0.6ms linear ramp from 0V to 0.8V on VFB pin prevents output overshoot and limits inrush into bulk capacitance during power-up. |
| Overvoltage protection | Trips at VFB > 0.88V (10% above reference) with 40mV hysteresis, holding PGATE high to disconnect P-MOSFET-protects downstream ICs during load dump or feedback fault. |
Applications
| Portable Medical Sensors | Industrial Handheld Terminals |
|---|---|
Use Scenario: Battery-powered glucose meter with OLED display and BLE radio requiring dual regulated rails (3.3V for MCU, 1.8V for sensor interface). IC Role / Device Role / Timing Role: LTC3772ETS8#TRPBF serves as primary buck controller for 3.3V rail, driving a 20VDS P-MOSFET with 80mΩ RDS(ON) to achieve >90% efficiency at 500mA load. Use Value: 40µA quiescent current extends 200mAh Li-ion battery life to >6 months in sleep mode; No RSENSE™ eliminates 2% conduction loss and saves 1.5mm² PCB area. | Use Scenario: Ruggedized barcode scanner operating from 3.7V Li-ion with fast wake-from-sleep requirement and ESD-sensitive imaging sensor. IC Role / Device Role / Timing Role: LTC3772ETS8#TRPBF regulates 1.2V core voltage for ARM Cortex-M4 processor, using ITH/RUN pin for controlled power sequencing with host MCU. Use Value: 0.6ms soft-start prevents 1.2V rail overshoot beyond 1.26V (±5%), ensuring safe boot; 550kHz operation allows 2.2µH shielded inductor fitting within 3.2mm height constraint. |
| Wireless Audio Earbuds | Distributed Power Modules |
Use Scenario: True wireless stereo (TWS) earbud with active noise cancellation (ANC), requiring ultra-low-noise 1.1V DSP rail and minimal standby drain. IC Role / Device Role / Timing Role: LTC3772ETS8#TRPBF controls low-RDS(ON) P-MOSFET in buck stage feeding post-regulator LDO; Burst Mode® maintains <25µA system sleep current. Use Value: Low-ripple Burst Mode® reduces output voltage ripple to <5mVpp at 100µA load-preventing audible noise in ANC feedback path; TSOT-23 footprint fits 8mm × 8mm PCB real estate. | Use Scenario: 12V intermediate bus powering multiple point-of-load converters in telecom line card; LTC3772ETS8#TRPBF used for auxiliary 5V management rail. IC Role / Device Role / Timing Role: LTC3772ETS8#TRPBF operates in continuous conduction mode at 550kHz, delivering 2A to FPGA configuration and monitoring circuits. Use Value: Wide 2.75V–9.8V input range accommodates brownout events on 5V bus; ±1.5% reference accuracy ensures reliable reset signaling to supervisory ICs across temperature. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS54202DRCT | Integrated N-MOSFET driver; requires external current-sense resistor; 4.5V–17V input; 400kHz fixed frequency. | Designed for higher-input-voltage industrial supplies; lacks No RSENSE™ and Burst Mode®-higher light-load IQ (~120µA). | Choose when input exceeds 9.8V or N-MOSFET topology preferred; avoid for sub-3V battery apps due to higher UVLO (4.3V). |
| MAX17504ATP+T | Integrated high-side N-MOSFET; 4.5V–60V input; current-mode control; 100µA IQ in skip mode. | Targets wide-input industrial/automotive rails; no P-MOSFET support; larger 20-pin TQFN package. | Use for >12V inputs or where integrated FET simplifies layout; not suitable for Li-ion direct feed or space-constrained designs. |
Compared with TPS54202DRCT and MAX17504ATP+T, the LTC3772ETS8#TRPBF uniquely combines ultra-low IQ (40µA), No RSENSE™ P-MOSFET control, and sub-3V operation-making it optimal for single-cell Li-ion portable systems where board area, battery life, and dropout performance are prioritized over input voltage range or integration level.
Availability
LTC3772ETS8#TRPBF is available at Aetrix Electronics and suitable for portable medical sensors, industrial handheld terminals, wireless audio earbuds, and distributed power modules requiring stable component supply, long-term lifecycle support, and guaranteed RoHS compliance.
Supply support for LTC3772ETS8#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) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, formed through the acquisition of Linear Technology in 2017.
The LTC3772ETS8#TRPBF belongs to ADI's legacy Linear Technology power management portfolio, specifically engineered for ultra-low-power, high-efficiency step-down control in battery-operated portable electronics-emphasizing minimal quiescent current, small footprint, and seamless integration with discrete P-channel MOSFETs.
FAQ
What is the absolute maximum input voltage rating for the LTC3772ETS8#TRPBF?
The LTC3772ETS8#TRPBF has an absolute maximum input voltage rating of 10V. Exceeding this value-even momentarily-may cause permanent damage. The recommended operating range is 2.75V to 9.8V, and the undervoltage lockout (UVLO) activates below 2.0V (rising threshold). Always include input transient suppression if the source can exceed 10V.
How does the IPRG pin configure peak current limit on the LTC3772ETS8#TRPBF?
The IPRG pin on the LTC3772ETS8#TRPBF selects the maximum peak current sense voltage threshold: tying to GND sets 105mV, leaving floating sets 175mV, and connecting to VIN sets 245mV. This directly determines the maximum inductor current via IPEAK = ΔVSENSE(MAX)/RDS(ON) of the external P-MOSFET-enabling precise current limiting without a sense resistor.
Can the LTC3772ETS8#TRPBF operate in 100% duty cycle dropout mode, and how is it enabled?
Yes, the LTC3772ETS8#TRPBF automatically enters 100% duty cycle dropout when VIN approaches VOUT, turning the external P-MOSFET fully on to maintain regulation. No external circuitry is needed-this behavior is inherent to its architecture and occurs seamlessly as input voltage declines, maximizing usable battery capacity before system shutdown.
What is the purpose of the ITH/RUN pin on the LTC3772ETS8#TRPBF, and how is it used for soft-start?
The ITH/RUN pin on the LTC3772ETS8#TRPBF serves three roles: error amplifier output, run/shutdown control, and soft-start ramp node. During startup, an internal 1µA current charges the external compensation capacitor, causing ITH/RUN to rise linearly-ramping VFB from 0V to 0.8V over ~0.6ms and smoothly increasing VOUT without overshoot.
Does the LTC3772ETS8#TRPBF require an external compensation network, and what type is recommended?
Yes, the LTC3772ETS8#TRPBF requires an external Type II compensation network connected to the ITH/RUN pin. A standard configuration uses a series RC (e.g., 100kΩ + 1nF) from ITH/RUN to VFB, with optional feed-forward capacitor (CFF) across the upper feedback resistor. This stabilizes the current-mode loop and sets phase margin for load transients across the full operating range.
LTC3772ETS8#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- SOT-23-8 Thin, TSOT-23-8
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Type:
- Transistor Driver
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Number of Outputs:
- 1
- Output Phases:
- 1
- Voltage - Supply (Vcc/Vdd):
- 2.75V ~ 9.8V
- Frequency - Switching:
- 550kHz
- Duty Cycle (Max):
- 100%
- Synchronous Rectifier:
- No
- Clock Sync:
- No
- Serial Interfaces:
- -
- Control Features:
- Current Limit, Enable
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-8
LTC3772ETS8#TRPBF FAQ
1.How can I place an order for LTC3772ETS8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3772ETS8#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 LTC3772ETS8#TRPBF reliable?
The price and inventory of LTC3772ETS8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3772ETS8#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3772ETS8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3772ETS8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3772ETS8#TRPBF?
LTC3772ETS8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3772ETS8#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 LTC3772ETS8#TRPBF?
For technical support, including LTC3772ETS8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3772ETS8#TRPBF requirements.
6.How does Aetrix verify that LTC3772ETS8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3772ETS8#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 LTC3772ETS8#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3772ETS8#TRPBF?
All LTC3772ETS8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3772ETS8#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 LTC3772ETS8#TRPBF part is unused and in its original packaging.
Return procedure for LTC3772ETS8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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