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Analog Devices Inc. LTC1772IS6#TRPBF
- Part No.:
- LTC1772IS6#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LTC1772IS6#TRPBF.pdf
- Description:
- IC REG CTRLR MULT TOP SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:3,000
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Product details
Overview
LTC1772IS6#TRPBF 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, 550kHz fixed switching frequency, Burst Mode® operation for light-load efficiency, and supports input voltages from 2.5V to 9.8V - ideal for lithium-ion-powered portable systems requiring regulated 1.8V/2.5V/3.3V rails.
For engineers reviewing the LTC1772IS6#TRPBF datasheet, LTC1772IS6#TRPBF pinout, LTC1772IS6#TRPBF application, or LTC1772IS6#TRPBF equivalent, key selection considerations include its 6-pin SOT-23 footprint, 0.8V internal reference enabling low-output-voltage designs, 100% duty-cycle dropout operation, UVLO threshold of 2.00V (typ), and 8µA shutdown current - all critical for battery life and compact power architecture validation.
Technical Context
The LTC1772IS6#TRPBF implements a current-mode control architecture with a 0.8V precision reference, slope-compensated PWM, and integrated undervoltage lockout (UVLO) that disables operation below 2.00V (typ). Its ITH/RUN pin serves dual roles: error amplifier compensation node and run/shutdown control, with 0.35V threshold for entering shutdown.
It features overvoltage protection (OVP) triggered at 7.5% above VREF (0.820–0.895V), short-circuit foldback via oscillator frequency reduction to ~120kHz, and gate drive capable of sourcing/sinking 1A peak into 3000pF load with 40ns rise/fall times - enabling robust external P-MOSFET switching across wide VIN and load transients.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Operating Frequency | 550kHz (typ); enables use of small 4.7µH inductors and reduces output ripple filtering burden. |
| Input Voltage Range | 2.5V to 9.8V; supports single/dual Li-ion battery inputs and distributed 3.3V/2.5V/1.8V systems. |
| Reference Voltage | 0.800V (±2.5%); sets output via external resistor divider - allows precise 1.8V, 2.5V, or 3.3V regulation. |
| Quiescent Current | 270µA (typ); minimizes no-load power draw in always-on subsystems. |
| Shutdown Current | 8µA (typ); extends battery runtime during system sleep or standby modes. |
| UVLO Threshold | 2.00V (typ, falling); prevents unstable regulation and MOSFET stress during brownout conditions. |
| Peak Sense Voltage | 120mV; defines current limit threshold across RSENSE - enables accurate output current setting. |
Pinout & Package
The LTC1772IS6#TRPBF is housed in a 6-lead plastic TSOT-23 package (JEDEC MO-193), measuring 2.90mm × 1.60mm × 0.95mm, with exposed pad not electrically connected. Pin 1 is marked by a dot or bevelled edge.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ITH/RUN (Pin 1) | Error amplifier output & run control input | Controls peak inductor current; <0.35V forces shutdown; internal 0.5µA current source charges external compensation network on wake-up. |
| GND (Pin 2) | Power and signal ground reference | Must be low-impedance connection point for CIN, RSENSE, and feedback resistors to minimize noise coupling. |
| VFB (Pin 3) | Feedback input to error amplifier | Monitors output via resistive divider; regulated to 0.800V - determines final VOUT = 0.8 × (1 + R1/R2). |
| SENSE– (Pin 4) | Negative current sense input | Connects to low-side of RSENSE; senses voltage drop across sense resistor to regulate peak inductor current. |
| VIN (Pin 5) | Main power supply input | Supplies internal circuitry and PGATE driver; must be decoupled with ≥10µF ceramic capacitor close to pin. |
| PGATE (Pin 6) | P-channel MOSFET gate driver output | Swings from 0V to VIN; drives external P-MOSFET gate with 1A peak current and 40ns edge rates. |
Key Features
| Feature | Design Value |
|---|---|
| Constant-frequency current-mode control | Ensures predictable EMI profile and stable loop response across line/load variations - no subharmonic oscillation up to 50% duty cycle without slope compensation. |
| Burst Mode® operation | Reduces quiescent current to ~230µA in sleep mode and maintains >85% efficiency at 1mA load - critical for long-idle portable devices. |
| 100% duty-cycle dropout | Enables seamless transition to linear regulation when VIN ≈ VOUT - preserves output regulation down to (VIN – VOUT) < 100mV with minimal dropout loss. |
| Integrated overvoltage protection (OVP) | Shuts off PGATE when VFB exceeds 0.820V (7.5% above 0.8V ref); 20mV hysteresis prevents chatter during transient recovery. |
| Low-threshold UVLO | Disables regulator at 2.00V (typ) to prevent erratic switching and MOSFET shoot-through during battery depletion - protects downstream loads. |
Applications
| Cellular Telephones | Portable Computers |
|---|---|
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: Step-down DC/DC controller managing external P-MOSFET and sense resistor to deliver tightly regulated, low-noise 1.8V at up to 2A. Use Value: Burst Mode® extends talk time by minimizing idle current; 550kHz switching allows compact 4.7µH inductor and ceramic output caps. | Use Scenario: Generating 2.5V I/O rail for USB controllers and memory interfaces in ultra-thin notebooks. IC Role / Device Role / Timing Role: Constant-frequency buck controller driving P-MOSFET with 0.8V reference and 100% dropout capability for stable rail during battery sag. Use Value: ±2.5% output accuracy ensures compliance with JEDEC I/O voltage specs; 8µA shutdown current preserves battery during suspend-to-RAM. |
| Distributed 3.3V Power Systems | Wireless Modems |
Use Scenario: Local point-of-load conversion from 5V or 3.3V backplane to 3.3V logic supply in industrial IoT gateways. IC Role / Device Role / Timing Role: High-efficiency step-down controller supporting wide VIN (2.5–9.8V), enabling flexible sourcing from multiple upstream rails. Use Value: Wide input range eliminates need for pre-regulators; 94% peak efficiency reduces thermal load in sealed enclosures. | Use Scenario: Supplying 1.8V RF transceiver bias in LTE/Wi-Fi modules powered by 3.7V Li-ion. IC Role / Device Role / Timing Role: Low-quiescent-current buck controller with fast transient response to handle bursty RF transmit current demands. Use Value: Current-mode architecture delivers excellent load transient suppression (<5% deviation); 270µA IQ minimizes standby drain. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down DC/DC controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC1622CGN#PBF | 8-lead MSOP; supports sync-to-external clock (up to 750kHz); higher max IOUT (4.5A); requires external N-MOSFET. | Designed for higher-current, synchronizable multi-rail systems; lacks integrated P-MOSFET drive - needs gate driver or N-MOS layout. | Select when needing >2A output, synchronization, or N-MOSFET efficiency advantages; not pin-compatible. |
| LTC1702EGN#PBF | 16-lead SSOP; dual-phase 550kHz controller; supports up to 15A total; includes phase interleaving and current sharing. | Targeted at high-power CPU/GPU VRMs; requires two inductors, two MOSFET sets, and complex layout - over-specified for single-rail 2A use. | Choose only for multi-phase, high-current applications; incompatible footprint and control scheme. |
Compared with LTC1772IS6#TRPBF, LTC1622CGN#PBF offers greater current capability and clock synchronization but demands N-MOSFET design and larger layout area, while LTC1702EGN#PBF provides dual-phase scalability at the cost of complexity and component count - neither matches the LTC1772IS6#TRPBF's combination of ultra-small SOT-23 size, P-MOSFET simplicity, and optimized low-IQ portable operation.
Availability
LTC1772IS6#TRPBF is available at Aetrix Electronics and suitable for cellular telephones, portable computers, wireless modems, and distributed 3.3V/2.5V/1.8V power systems requiring stable component supply, long-term lifecycle support, and consistent parametric performance across temperature.
Supply support for LTC1772IS6#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 maintains full product support, documentation, and manufacturing continuity for legacy Linear parts including the LTC1772 series.
The LTC1772IS6#TRPBF belongs to Linear's high-efficiency, low-voltage DC/DC controller family - engineered specifically for space-constrained, battery-powered applications demanding minimal quiescent current, robust dropout behavior, and reliable operation across –40°C to +85°C.
FAQ
What is the operating temperature range of the LTC1772IS6#TRPBF?
The LTC1772IS6#TRPBF is specified for operation from –40°C to +85°C and is guaranteed to meet all electrical specifications across this industrial temperature range. This rating is confirmed in the "PACKAGE/ORDER INFORMATION" table of the datasheet, where "LTC1772IS6" is explicitly listed with "–40°C to 85°C" under Operating Temperature Range.
Does the LTC1772IS6#TRPBF integrate a power switch, or does it require an external MOSFET?
The LTC1772IS6#TRPBF is a controller-only IC and requires an external P-channel MOSFET - it does not integrate any power switch. Its PGATE pin drives the gate of an external P-MOSFET (e.g., Fairchild FDC638P or Si3443DV), while SENSE– monitors current via an external sense resistor. This architecture enables optimization of efficiency, voltage rating, and thermal performance per application.
What is the purpose of the ITH/RUN pin on the LTC1772IS6#TRPBF?
The ITH/RUN pin (Pin 1) on the LTC1772IS6#TRPBF serves two critical functions: it acts as the output node of the internal error amplifier for loop compensation, and as the run/shutdown control input. Pulling this pin below 0.35V disables the controller and forces PGATE high; releasing it allows an internal 0.5µA current source to charge the external compensation network, enabling soft-start and controlled turn-on of the LTC1772IS6#TRPBF.
Can the LTC1772IS6#TRPBF operate with an input voltage below 2.5V?
The absolute minimum recommended input voltage for continuous operation of the LTC1772IS6#TRPBF is 2.5V, as stated in the "Electrical Characteristics" table. Although the device may function down to ~2.0V, the datasheet notes reduced output current capability below 3V and specifies UVLO turn-off at 2.00V (typ), meaning sustained operation below 2.5V is not guaranteed and risks instability or premature shutdown.
How does Burst Mode® operation improve efficiency in the LTC1772IS6#TRPBF?
Burst Mode® operation in the LTC1772IS6#TRPBF reduces switching activity at light loads by gating the oscillator - the controller enters sleep mode when ITH/RUN falls below 0.85V and resumes normal 550kHz operation when it rises above 0.925V. This cuts dynamic gate drive losses and quiescent current to ~230µA, sustaining >85% efficiency at 1mA output - significantly extending battery life in standby or intermittent-use applications.
LTC1772IS6#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 ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-6
LTC1772IS6#TRPBF FAQ
1.How can I place an order for LTC1772IS6#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1772IS6#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 LTC1772IS6#TRPBF reliable?
The price and inventory of LTC1772IS6#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1772IS6#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1772IS6#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1772IS6#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1772IS6#TRPBF?
LTC1772IS6#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1772IS6#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 LTC1772IS6#TRPBF?
For technical support, including LTC1772IS6#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1772IS6#TRPBF requirements.
6.How does Aetrix verify that LTC1772IS6#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1772IS6#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 LTC1772IS6#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1772IS6#TRPBF?
All LTC1772IS6#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1772IS6#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 LTC1772IS6#TRPBF part is unused and in its original packaging.
Return procedure for LTC1772IS6#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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