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Analog Devices Inc. LTC1772ES6#TRMPBF
- Part No.:
- LTC1772ES6#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LTC1772ES6#TRMPBF.pdf
- Description:
- IC REG CTRLR MULT TOP SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:500
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Product details
Overview
LTC1772ES6#TRMPBF 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. It is used in lithium-ion-powered portable electronics requiring compact, low-quiescent-current regulation.
For engineers reviewing the LTC1772ES6#TRMPBF datasheet, LTC1772ES6#TRMPBF pinout, LTC1772ES6#TRMPBF application, or LTC1772ES6#TRMPBF equivalent, key selection criteria include its -40°C to +85°C operating temperature range, 0.8V internal reference enabling low-output-voltage designs, Burst Mode® operation for light-load efficiency, UVLO threshold of 2.00V (typ), and gate drive capability for external P-MOSFETs with 1A peak sink/source.
Technical Context
The LTC1772ES6#TRMPBF implements a fixed-frequency current-mode control architecture with slope compensation above 40% duty cycle, using an internal 0.8V reference and error amplifier feedback via VFB. Its ITH/RUN pin serves dual roles: compensation node and run/shutdown control, with 0.35V threshold for shutdown activation and 0.7–1.9V nominal operating range.
It integrates undervoltage lockout (UVLO), overvoltage protection (OVP at 7.5% above VREF with 20mV hysteresis), short-circuit frequency foldback (to ~120kHz), and sleep-mode logic that reduces quiescent current to 230–370µA during light-load Burst Mode operation - all while maintaining precise peak-current sensing via SENSE– with 120mV threshold.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5V to 9.8V - supports single- or dual-cell Li-ion battery inputs without external LDO pre-regulation. |
| Switching Frequency | 550kHz (typ) - enables use of small 4.7µH inductors and reduces output ripple filtering burden. |
| Reference Voltage | 0.800V (±2.5%) - sets minimum output voltage; allows 1.8V/2.5V/3.3V outputs with standard resistor dividers. |
| Quiescent Current | 270µA (typ) - minimizes battery drain in active mode; critical for always-on portable systems. |
| Shutdown Current | 8µA (typ) - extends shelf life and standby time in battery-backed applications. |
| UVLO Threshold | 2.00V (typ, falling) - prevents erratic operation below safe Li-ion cell voltage, protecting system integrity. |
| Peak Sense Voltage | 120mV - defines current limit threshold across RSENSE; enables accurate, scalable output current setting. |
Pinout & Package
The LTC1772ES6#TRMPBF is housed in a 6-lead plastic TSOT-23 (S6) package, 1.90mm × 2.80mm footprint, 0.95mm height, RoHS-compliant and lead-free (#PBF).
| 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 | Must be low-impedance connection shared with CIN, RSENSE, and output capacitor negative terminal. |
| VFB (Pin 3) | Feedback input to error amplifier | Compares divided output voltage against 0.8V reference; determines regulation setpoint. |
| SENSE– (Pin 4) | Negative current-sense comparator input | Monitors voltage drop across external sense resistor; triggers MOSFET turn-off when 120mV threshold reached. |
| VIN (Pin 5) | Main power supply input | Supplies internal circuitry and gate driver; must be decoupled with ≥10µF ceramic capacitor close to pin. |
| PGATE (Pin 6) | High-side P-MOSFET gate driver output | Sources/sinks up to 1A peak; swings from 0V to VIN; requires low-inductance layout to minimize ringing. |
Key Features
| Feature | Design Value |
|---|---|
| Constant 550kHz frequency | Enables predictable EMI filtering and consistent inductor sizing across designs; avoids subharmonic instability. |
| Burst Mode® operation | Reduces light-load quiescent current to ~230µA while maintaining regulation - essential for battery runtime extension. |
| 100% duty-cycle dropout | Allows continuous conduction as VIN approaches VOUT, maximizing usable battery voltage range down to ~2.0V. |
| Integrated UVLO and OVP | Provides autonomous protection: UVLO disables regulator below 2.0V; OVP shuts off PGATE if VFB exceeds 0.86V (7.5% over VREF). |
| Current-mode control with slope compensation | Delivers fast transient response to load steps and stable operation up to 90% duty cycle with external P-MOSFET. |
Applications
| Cellular Telephones | Portable Computers |
|---|---|
Use Scenario: Regulating 2.5V or 1.8V core voltage from a 3.3V–4.2V Li-ion battery in GSM/UMTS handsets with burst traffic patterns. IC Role / Device Role / Timing Role: Primary step-down controller driving external P-MOSFET; manages dynamic load transients during RF transmit bursts. Use Value: Burst Mode® maintains >85% efficiency at 10mA load, extending talk time; 550kHz frequency minimizes PCB area vs. lower-frequency alternatives. | Use Scenario: Generating 3.3V I/O rail from a 7.4V dual-cell Li-ion pack in ultra-thin notebooks with thermal constraints. IC Role / Device Role / Timing Role: High-efficiency buck controller enabling compact, low-profile power stage with minimal heatsinking. Use Value: 94% peak efficiency and 270µA quiescent current reduce thermal load and extend battery autonomy between charges. |
| Wireless Modems | Distributed Power Systems |
Use Scenario: Providing regulated 3.3V supply to LTE/Wi-Fi modules in industrial IoT gateways powered by wide-input-range adapters (5–9V). IC Role / Device Role / Timing Role: Input-flexible DC/DC controller supporting variable adapter voltages while maintaining tight output regulation. Use Value: Wide 2.5V–9.8V VIN range eliminates need for pre-regulator; UVLO ensures clean startup only above 2.0V. | Use Scenario: Local point-of-load regulation for 2.5V FPGA I/O banks in distributed 3.3V backplane systems. IC Role / Device Role / Timing Role: Compact, low-noise buck controller placed near load to minimize IR drop and improve PSRR. Use Value: Tiny SOT-23 footprint saves board space; current-mode control rejects input ripple and improves transient immunity. |
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; includes soft-start. | Requires external bootstrap circuitry for N-MOSFET; higher pin count; better suited for higher-current (>2A) designs. | Select when needing higher output current, synchronization, or N-MOSFET efficiency advantages - not drop-in compatible. |
| TPS54202DRCT | Integrated N-MOSFETs (2A); 4.5–17V input; 500kHz fixed freq; 25µA shutdown current. | Monolithic solution eliminates external MOSFET and sense resistor; wider VIN but no 100% dropout or Burst Mode®. | Choose for simplified BOM and layout where 2A integrated switch suffices and 100% duty cycle is not required. |
Compared with LTC1622CGN#PBF and TPS54202DRCT, the LTC1772ES6#TRMPBF offers unique value in ultra-low quiescent current, true 100% dropout, and P-MOSFET simplicity for sub-2A Li-ion applications - but requires external FET and sense resistor, unlike the monolithic TPS54202DRCT.
Availability
LTC1772ES6#TRMPBF is available at Aetrix Electronics and suitable for cellular telephones, portable computers, and wireless modems requiring stable component supply, long-lifecycle support, and guaranteed -40°C to +85°C operation.
Supply support for LTC1772ES6#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 manufacturing continuity for legacy Linear parts including the LTC1772 series.
The LTC1772 belongs to Linear's precision DC/DC controller family, engineered specifically for high-efficiency, low-voltage portable power applications where battery life, small size, and reliable dropout operation are critical design requirements.
FAQ
What is the operating temperature range of the LTC1772ES6#TRMPBF?
The LTC1772ES6#TRMPBF is specified for operation from –40°C to +85°C ambient temperature. This extended range is validated per Linear Technology's characterization and statistical process controls, making it suitable for industrial and automotive-adjacent portable applications where thermal robustness is required. The device's junction temperature must remain ≤150°C under all conditions.
Does the LTC1772ES6#TRMPBF support 100% duty-cycle operation, and how does it behave in dropout?
Yes, the LTC1772ES6#TRMPBF supports 100% duty-cycle operation. When VIN drops near VOUT, the controller sustains conduction by holding the external P-channel MOSFET fully on, allowing output voltage to track VIN minus losses across the MOSFET, sense resistor, and inductor. This dropout behavior maximizes usable battery energy - critical for Li-ion systems where every millivolt matters.
What is the function of the ITH/RUN pin on the LTC1772ES6#TRMPBF?
The ITH/RUN pin on the LTC1772ES6#TRMPBF serves two functions: it is the output of the internal error amplifier (used for loop compensation with external RC network) and 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 compensation network and re-enable regulation once voltage reaches ~0.7V.
Can the LTC1772ES6#TRMPBF drive an N-channel MOSFET instead of a P-channel MOSFET?
No, the LTC1772ES6#TRMPBF is designed exclusively for external P-channel MOSFET drive via its PGATE output, which swings from 0V to VIN. It lacks bootstrap circuitry or high-side gate drive capability required for N-MOSFETs. For N-channel solutions, consider alternatives like the LTC1622 or LTC1624 - but those are not pin-compatible replacements for the LTC1772ES6#TRMPBF.
What is the typical efficiency of a design using the LTC1772ES6#TRMPBF, and what factors most affect it?
A well-designed LTC1772ES6#TRMPBF circuit achieves up to 94% peak efficiency at moderate loads (e.g., 2A @ 2.5V out from 6V in). Efficiency is most affected by MOSFET RDS(ON), inductor DCR, Schottky diode forward voltage, and switching losses - especially gate charge at 550kHz. Light-load efficiency is enhanced by Burst Mode®, reducing quiescent current to ~230µA without sacrificing regulation.
LTC1772ES6#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 ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-6
LTC1772ES6#TRMPBF FAQ
1.How can I place an order for LTC1772ES6#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1772ES6#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 LTC1772ES6#TRMPBF reliable?
The price and inventory of LTC1772ES6#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1772ES6#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC1772ES6#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1772ES6#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1772ES6#TRMPBF?
LTC1772ES6#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1772ES6#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 LTC1772ES6#TRMPBF?
For technical support, including LTC1772ES6#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1772ES6#TRMPBF requirements.
6.How does Aetrix verify that LTC1772ES6#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC1772ES6#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 LTC1772ES6#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC1772ES6#TRMPBF?
All LTC1772ES6#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1772ES6#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 LTC1772ES6#TRMPBF part is unused and in its original packaging.
Return procedure for LTC1772ES6#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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