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Analog Devices Inc. LTC1772ES6#TRPBF
- Part No.:
- LTC1772ES6#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LTC1772ES6#TRPBF.pdf
- Description:
- IC REG CTRLR MULT TOP SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:1,671
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Product details
Overview
LTC1772ES6#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 LTC1772ES6#TRPBF datasheet, LTC1772ES6#TRPBF pinout, LTC1772ES6#TRPBF application, or LTC1772ES6#TRPBF equivalent, key selection considerations include its -40°C to +85°C industrial temperature rating, Burst Mode™ operation for light-load efficiency, undervoltage lockout at 2.0V (falling), overvoltage protection at 7.5% above VREF, and compatibility with low-threshold P-MOSFETs for sub-3V input operation.
Technical Context
The LTC1772ES6#TRPBF implements a current-mode control architecture with slope-compensated PWM, where peak inductor current is set by the ITH/RUN pin voltage and sensed via the SENSE– pin. Its oscillator operates at 550kHz under normal conditions but folds back to ~120kHz during short-circuit events to limit inductor current slew rate and prevent runaway.
Control logic integrates undervoltage lockout (UVLO), burst mode sleep/wake thresholds (0.85V/0.925V on ITH/RUN), overvoltage protection (0.820–0.895V at VFB with 20mV hysteresis), and shutdown activation below 0.35V on ITH/RUN. Gate drive delivers 1A peak current with 40ns rise/fall times into 3000pF load, swinging PGATE from 0V to VIN.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Operating Temperature Range | -40°C to +85°C - qualified for industrial environments with full electrical specs guaranteed. |
| Switching Frequency | 500–650kHz (typ. 550kHz) - enables compact 4.7µH inductors and reduces output ripple without sacrificing efficiency. |
| Reference Voltage | 0.770–0.830V (typ. 0.800V) - sets output voltage via external resistor divider; enables 1.8V, 2.5V, or 3.3V regulation. |
| Quiescent Current | 270µA (typ.) - minimizes standby power loss in battery-powered systems like portable computers and modems. |
| Shutdown Current | 8µA (typ.) - extends battery life during system sleep modes without requiring external disconnect. |
| UVLO Threshold | 1.55–2.35V (falling) - prevents unstable operation below safe input voltage; hysteresis ensures clean restart. |
| Peak Current Sense | 120mV - defines maximum inductor current; allows precise current limiting and RSENSE sizing down to 0.03Ω. |
Pinout & Package
Package: 6-lead TSOT-23 (S6), 1.90mm × 2.90mm footprint, 0.95mm height, JEDEC MO-193 compliant. Thermal resistance θJA = 230°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ITH/RUN (Pin 1) | Error amplifier output & run control | Sets peak current threshold; pulled low (<0.35V) disables regulator; internal 0.5µA current source charges compensation network on wake-up. |
| GND (Pin 2) | Analog and power ground reference | Common return for feedback, sense, and gate drive paths; must be low-impedance connection to minimize noise coupling. |
| VFB (Pin 3) | Feedback input to error amplifier | Compares output voltage (via resistive divider) against 0.8V reference; 10–50nA input bias enables high-resistor-divider designs. |
| SENSE– (Pin 4) | Negative current sense input | Monitors voltage drop across external sense resistor; used with VIN to determine inductor current magnitude and timing. |
| VIN (Pin 5) | Main power supply input | Supplies internal circuitry and gate driver; must be decoupled locally with ≥0.1µF ceramic capacitor to GND. |
| PGATE (Pin 6) | P-channel MOSFET gate driver output | Drives external P-MOSFET gate from 0V to VIN; 1A peak capability supports fast turn-on of low-RDS(on) devices. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode™ operation | Enables >90% efficiency at light loads (e.g., <10mA) by gating switching cycles, reducing gate charge and core losses. |
| 100% duty cycle dropout | Maintains regulation as VIN approaches VOUT by holding PGATE high - critical for Li-ion battery discharge down to 2.5V. |
| Overvoltage protection (OVP) | Shuts off PGATE if VFB exceeds 0.820–0.895V (7.5% above VREF); 20mV hysteresis prevents chatter during transients. |
| Short-circuit foldback | Reduces oscillator frequency to ~120kHz during output shorts, limiting inductor current and diode stress. |
| Low-input-voltage support | Operates down to 2.5V VIN with full functionality; UVLO ensures reliable start-up only above 2.0V (falling). |
Applications
| Cellular Telephones | Wireless Modems |
|---|---|
Use Scenario: Powering baseband processor and RF transceiver from single-cell Li-ion battery (2.7–4.2V). IC Role / Device Role / Timing Role: Step-down controller regulating 1.8V core and 2.5V I/O rails with dynamic load response. Use Value: Burst Mode™ maintains >85% efficiency at standby currents <5mA; 100% duty cycle sustains output as battery discharges to 2.5V. | Use Scenario: Providing stable 3.3V supply to WLAN/BT chipset in compact USB dongle or M.2 module. IC Role / Device Role / Timing Role: Primary buck controller driving P-MOSFET with minimal external components. Use Value: 550kHz switching enables use of 4.7µH inductor and 47µF OS-CON output cap - meets size constraints while delivering 2A peak current. |
| Portable Computers | Distributed Power Systems |
Use Scenario: Generating 2.5V or 3.3V auxiliary rail for SSD controller or USB hub in ultra-thin notebook. IC Role / Device Role / Timing Role: Secondary regulator fed from main 5V or 12V bus, supporting dynamic voltage scaling. Use Value: ±2.5% VOUT accuracy and 0.05mV/V line regulation ensure stable operation across wide input range (2.5–9.8V). | Use Scenario: Local point-of-load conversion in telecom shelf or industrial PLC with distributed 5V/12V backplane. IC Role / Device Role / Timing Role: Compact, high-efficiency buck controller for isolated 1.8V/2.5V FPGA or ASIC supplies. Use Value: TSOT-23 package fits dense layouts; -40°C to +85°C rating ensures reliability in uncontrolled ambient environments. |
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; higher max output current (4.5A); requires N-MOSFET. | Designed for higher-current, synchronizable systems; lacks integrated UVLO hysteresis and Burst Mode™ optimization for ultra-low IQ. | Choose LTC1622CGN#PBF when needing >2A output or clock synchronization; not drop-in due to different topology and pinout. |
| LT1376CS8#PBF | SO-8; integrated 1.5A N-MOSFET driver; fixed 500kHz; no Burst Mode™; higher IQ (1.1mA). | Targeted at medium-power, cost-sensitive applications; less suitable for battery life-critical designs due to higher quiescent current. | Choose LT1376CS8#PBF for simpler layout with integrated FET drive; avoid where <300µA IQ or Burst Mode™ is required. |
Compared with LTC1622CGN#PBF and LT1376CS8#PBF, the LTC1772ES6#TRPBF offers superior light-load efficiency via Burst Mode™, lower quiescent current, and smaller TSOT-23 footprint - making it optimal for space-constrained, battery-operated systems requiring long runtime and tight regulation.
Availability
LTC1772ES6#TRPBF is available at Aetrix Electronics and suitable for cellular telephones, wireless modems, portable computers, and distributed 3.3V/2.5V/1.8V power systems requiring stable component supply across industrial temperature ranges.
Supply support for LTC1772ES6#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 its precision analog and power management portfolio. Linear Technology was founded in 1981 and specialized in high-performance linear ICs, switching regulators, and battery management solutions.
The LTC1772ES6#TRPBF belongs to Linear's legacy current-mode DC/DC controller family, engineered for high-efficiency, low-voltage step-down conversion in portable and battery-powered equipment where small size, low IQ, and robust transient response are essential.
FAQ
What is the operating temperature range of the LTC1772ES6#TRPBF?
The LTC1772ES6#TRPBF is specified for operation from –40°C to +85°C and is fully guaranteed over this industrial temperature range. Electrical characteristics including reference voltage accuracy (±2.5%), UVLO thresholds, and oscillator frequency stability are validated across this span. The device uses the "E" grade suffix per Linear Technology's ordering nomenclature, distinguishing it from commercial (C), industrial (I), and high-temp (H) variants.
Does the LTC1772ES6#TRPBF support 100% duty cycle operation?
Yes, the LTC1772ES6#TRPBF supports true 100% duty cycle operation in dropout mode. When input voltage falls near the regulated output voltage, the controller holds PGATE high continuously, allowing the external P-channel MOSFET to conduct without switching. This maintains regulation down to VIN ≈ VOUT + VDS(on) + IOUT×RSENSE, critical for single-cell Li-ion applications discharging to 2.5V.
What is the purpose of the ITH/RUN pin on the LTC1772ES6#TRPBF?
The ITH/RUN pin on the LTC1772ES6#TRPBF serves dual functions: it acts as the error amplifier output (setting peak inductor current threshold) and as the run/shutdown control input. Pulling ITH/RUN below 0.35V disables the controller and forces PGATE high. An internal 0.5µA current source charges external compensation components upon wake-up, enabling controlled soft-start and current-limit ramp-up.
How does Burst Mode™ operation improve efficiency in the LTC1772ES6#TRPBF?
Burst Mode™ operation in the LTC1772ES6#TRPBF improves light-load efficiency by disabling switching cycles when output current demand drops below a threshold. During bursts, the ITH/RUN pin voltage falls below 0.85V, halting gate drive; it resumes when voltage rises above 0.925V. This eliminates switching losses and reduces gate charge current, achieving >90% efficiency at loads under 10mA - far exceeding standard PWM mode.
What external components are required to configure the LTC1772ES6#TRPBF for a 2.5V output?
To configure the LTC1772ES6#TRPBF for 2.5V output, use a resistor divider from VOUT to GND feeding VFB (Pin 3). With VREF = 0.800V, select R1 = 80.6kΩ and R2 = 54.9kΩ (standard 1% values), yielding VOUT = 0.8V × (1 + R1/R2) ≈ 2.5V. Also required: external P-MOSFET (e.g., Si3443DV), sense resistor (e.g., 0.03Ω), 4.7µH inductor, input capacitor (≥10µF ceramic), and output capacitor (≥47µF low-ESR).
LTC1772ES6#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
LTC1772ES6#TRPBF FAQ
1.How can I place an order for LTC1772ES6#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1772ES6#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 LTC1772ES6#TRPBF reliable?
The price and inventory of LTC1772ES6#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1772ES6#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1772ES6#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1772ES6#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1772ES6#TRPBF?
LTC1772ES6#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1772ES6#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 LTC1772ES6#TRPBF?
For technical support, including LTC1772ES6#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1772ES6#TRPBF requirements.
6.How does Aetrix verify that LTC1772ES6#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1772ES6#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 LTC1772ES6#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1772ES6#TRPBF?
All LTC1772ES6#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1772ES6#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 LTC1772ES6#TRPBF part is unused and in its original packaging.
Return procedure for LTC1772ES6#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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