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Analog Devices Inc. LTC1772CS6#TRPBF
- Part No.:
- LTC1772CS6#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LTC1772CS6#TRPBF.pdf
- Description:
- IC REG CTRLR MULT TOP SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:2,233
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Product details
Overview
LTC1772CS6#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, 270µA quiescent current, and supports 100% duty cycle dropout operation across 2.5V–9.8V input range with 0.8V internal reference.
For engineers reviewing the LTC1772CS6#TRPBF datasheet, LTC1772CS6#TRPBF pinout, LTC1772CS6#TRPBF application, or LTC1772CS6#TRPBF equivalent, key selection criteria include its Burst Mode™ operation for light-load efficiency, UVLO threshold of 2.0V (typ), gate drive capability for P-MOSFETs, low 8µA shutdown current, and compatibility with compact 6-lead SOT-23 layouts in space-constrained portable power systems.
Technical Context
The LTC1772CS6#TRPBF implements a current-mode control architecture with slope-compensated PWM, using an external resistive divider on VFB to regulate output voltage via a precise 0.8V reference. Its ITH/RUN pin serves dual roles: error amplifier compensation node and run/shutdown control, with 0.35V threshold for shutdown activation.
It features integrated overvoltage protection (OVP) triggered at 7.5% above VREF with 20mV hysteresis, short-circuit foldback reducing oscillator frequency to ~120kHz, and undervoltage lockout disabling all circuitry except UVLO block below 2.0V. The PGATE output swings rail-to-rail (0V to VIN) to drive P-MOSFET gates directly.
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 rails. |
| Reference Voltage | 0.800V (±2.5%); sets minimum output voltage and defines feedback divider ratio for precise regulation. |
| Quiescent Current | 270µA (typ); minimizes standby power loss in battery-powered systems during active regulation. |
| Shutdown Current | 8µA (typ); extends battery life in off-state without requiring external disconnect switches. |
| UVLO Threshold | 2.00V (falling, C-grade); prevents unstable operation or MOSFET stress during brownout conditions. |
| Peak Sense Voltage | 120mV; determines current limit threshold across external sense resistor for overcurrent protection. |
Pinout & Package
The LTC1772CS6#TRPBF is housed in a 6-lead plastic SOT-23 package (JEDEC MO-193 compliant), measuring 2.90mm × 1.60mm × 1.00mm, with gull-wing leads and exposed pad not present. Pin 1 is marked by a dot or bevelled edge.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ITH/RUN (Pin 1) | Error amplifier output & shutdown control | Drives external compensation network; pulled below 0.35V disables regulator and holds PGATE high. |
| GND (Pin 2) | Power and signal reference ground | Return path for internal circuits, sense resistor, and input/output capacitors; must be low-impedance. |
| VFB (Pin 3) | Feedback input to error amplifier | Compares divided output voltage against 0.8V reference; sets regulated output via R1/R2 divider. |
| SENSE– (Pin 4) | Negative current sense input | Monitors voltage drop across external sense resistor to detect peak inductor current for cycle-by-cycle limiting. |
| VIN (Pin 5) | Main power supply input | Bias source for internal circuitry and gate driver; requires local 0.1µF ceramic decoupling to GND. |
| PGATE (Pin 6) | P-channel MOSFET gate driver output | Swings from 0V to VIN to fully enhance external P-MOSFET; capable of 1A peak sink/source for fast switching. |
Key Features
| Feature | Design Value |
|---|---|
| Constant-frequency current-mode control | Delivers stable loop response with predictable ESR zero placement and immunity to input line variations. |
| Burst Mode™ operation | Reduces switching activity at light loads, maintaining >85% efficiency down to 1mA output current. |
| 100% duty cycle dropout | Enables continuous conduction when VIN ≈ VOUT, eliminating output collapse during battery discharge. |
| Integrated overvoltage protection | Shuts off PGATE if VFB exceeds 0.860V (typ), preventing transient damage to downstream loads. |
| Low 8µA shutdown current | Allows system-level power gating without auxiliary enable circuitry, simplifying power sequencing. |
Applications
| Cellular Telephones | Wireless Modems |
|---|---|
Use Scenario: Regulating 3.3V or 2.5V core logic supply from single Li-ion battery (3.0–4.2V). IC Role / Device Role / Timing Role: Primary step-down controller managing dynamic load transients during RF transmission bursts. Use Value: Burst Mode™ maintains >90% efficiency at standby currents <10mA while supporting 2A peak loads during call setup. | Use Scenario: Powering baseband processor and RF front-end in compact LTE/Wi-Fi modules. IC Role / Device Role / Timing Role: High-frequency (550kHz) buck controller enabling miniature 4.7µH inductors and low-profile ceramic output caps. Use Value: Tiny SOT-23 footprint saves PCB area; 270µA quiescent current extends battery runtime between data sessions. |
| Portable Computers | Distributed Power Systems |
Use Scenario: Generating 1.8V I/O or memory supply from 5V or 3.3V intermediate rail in sub-notebook designs. IC Role / Device Role / Timing Role: Secondary buck controller with accurate 0.8V reference ensuring tight tolerance on low-voltage rails. Use Value: ±2.5% output accuracy meets DDR/LPDDR voltage spec; 100% duty cycle sustains output as input drops near VOUT. | Use Scenario: Local point-of-load regulation for FPGA I/O banks or ASIC peripherals in industrial controllers. IC Role / Device Role / Timing Role: Standalone controller driving discrete P-MOSFET for design flexibility and thermal management. Use Value: Wide 2.5–9.8V input range accommodates 5V, 3.3V, or battery-backed supplies; UVLO prevents malfunction during brownouts. |
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 sync-to-external clock up to 750kHz; includes soft-start; higher max output current (4.5A). | Requires larger layout; suited for higher-current or synchronized multi-rail systems. | Choose LTC1622CGN#PBF when >2A output or clock synchronization is required; not pin-compatible. |
| LTC1702EGN#PBF | 2-phase dual controller in 20-lead SSOP; drives two external MOSFET pairs; 550kHz per phase. | Targets high-current (>5A), low-ripple applications; doubles effective switching frequency for smaller magnetics. | Choose LTC1702EGN#PBF for dual-phase 5A+ loads; incompatible pinout and control scheme. |
Compared with LTC1772CS6#TRPBF, LTC1622CGN#PBF offers higher integration and current capability but larger size, while LTC1702EGN#PBF provides multi-phase scalability at the cost of complexity-neither is pin-compatible, making LTC1772CS6#TRPBF optimal for compact, single-phase ≤2A designs.
Availability
LTC1772CS6#TRPBF is available at Aetrix Electronics and suitable for cellular telephones, wireless modems, and portable computers requiring stable component supply with guaranteed long-term availability and full traceability.
Supply support for LTC1772CS6#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 LTC1772 belongs to Linear's high-efficiency DC/DC controller family, engineered specifically for battery-powered portable electronics where small size, light-load efficiency, and robust dropout behavior are critical.
FAQ
What is the operating temperature range for the LTC1772CS6#TRPBF?
The LTC1772CS6#TRPBF is specified for operation from 0°C to +70°C ambient temperature. This commercial-grade rating aligns with its intended use in consumer portable devices such as cellular phones and modems. The device incorporates thermal shutdown protection and is rated for junction temperatures up to 150°C, though sustained operation above 125°C degrades lifetime reliability.
Does the LTC1772CS6#TRPBF require an external P-channel MOSFET?
Yes, the LTC1772CS6#TRPBF is a controller-not a complete regulator-and requires an external P-channel MOSFET connected to the PGATE pin. It does not integrate any power switches. The controller drives the MOSFET gate with rail-to-rail swing (0V to VIN) and supports logic-level P-MOSFETs with VGS(th) ≤ 2.5V for low-input-voltage operation. Selection guidelines for RDS(ON), CRSS, and gate charge are provided in the official datasheet.
How does Burst Mode™ operation improve efficiency in the LTC1772CS6#TRPBF?
Burst Mode™ operation in the LTC1772CS6#TRPBF reduces switching frequency and gate drive activity at light loads, cutting dynamic losses. When ITH/RUN falls below 0.85V, the controller enters sleep mode-holding PGATE high and halting switching-then resumes normal 550kHz operation when ITH/RUN rises above 0.925V. This enables efficiencies >85% at 1mA output, far exceeding standard PWM mode, which is essential for extending battery life in standby states.
Can the LTC1772CS6#TRPBF be used with N-channel MOSFETs?
No, the LTC1772CS6#TRPBF is designed exclusively for external P-channel MOSFETs. Its PGATE output swings from 0V to VIN, which correctly biases a P-MOSFET's gate relative to its source. Driving an N-MOSFET would require a bootstrap or floating gate driver stage, which the LTC1772CS6#TRPBF does not provide. For N-MOSFET-based controllers, consider alternatives like the LTC1624 or LTC1735.
What is the purpose of the SENSE– pin on the LTC1772CS6#TRPBF?
SENSE– (Pin 4) is the negative input to the internal current comparator, used to monitor the voltage drop across an external sense resistor placed between the source of the P-MOSFET and ground. It enables cycle-by-cycle peak current limiting and current-mode control. Accurate routing-short trace, Kelvin connection close to the resistor-is critical to avoid noise coupling and ensure stable current sensing, especially at high di/dt edges.
LTC1772CS6#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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-6
LTC1772CS6#TRPBF FAQ
1.How can I place an order for LTC1772CS6#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1772CS6#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 LTC1772CS6#TRPBF reliable?
The price and inventory of LTC1772CS6#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1772CS6#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1772CS6#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1772CS6#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1772CS6#TRPBF?
LTC1772CS6#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1772CS6#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 LTC1772CS6#TRPBF?
For technical support, including LTC1772CS6#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1772CS6#TRPBF requirements.
6.How does Aetrix verify that LTC1772CS6#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1772CS6#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 LTC1772CS6#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1772CS6#TRPBF?
All LTC1772CS6#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1772CS6#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 LTC1772CS6#TRPBF part is unused and in its original packaging.
Return procedure for LTC1772CS6#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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