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Analog Devices Inc. LTC1772BES6#TRPBF
- Part No.:
- LTC1772BES6#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LTC1772BES6#TRPBF.pdf
- Description:
- IC REG CTRLR MULT TOP SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:1,555
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Product details
Overview
LTC1772BES6#TRPBF from Analog Devices (formerly Linear Technology) is a constant-frequency, current-mode step-down DC/DC controller in TSOT-23-6 package, designed for battery-powered systems requiring high efficiency and low output ripple. It delivers up to 2A output current with 0.8V feedback reference, 550kHz fixed switching frequency, ±2.5% output voltage accuracy, and operates from 2.5V to 9.8V input. Used in lithium-ion-powered portable electronics for stable 1.8V/2.5V/3.3V regulation.
For engineers reviewing the LTC1772BES6#TRPBF datasheet, LTC1772BES6#TRPBF pinout, LTC1772BES6#TRPBF application, or LTC1772BES6#TRPBF equivalent, key selection criteria include its non-Burst Mode operation (lower light-load ripple), 100% duty-cycle dropout capability, 8μA shutdown current, P-channel MOSFET gate drive, and precise 0.8V VFB reference with ±2.5% tolerance over –40°C to 85°C.
Technical Context
The LTC1772BES6#TRPBF implements a current-mode control architecture with internal slope compensation active above 40% duty cycle, enabling stable operation with small inductors. Its error amplifier drives the ITH/RUN pin to regulate peak inductor current via external sense resistor, while the 0.8V reference sets output voltage via resistive divider on VFB.
It integrates undervoltage lockout (UVLO) at 2.0V (typ), overvoltage protection (OVP) at 7.5% above VREF with 20mV hysteresis, short-circuit foldback limiting, and 550kHz oscillator with ±10% variation over temperature. PGATE swings rail-to-rail (0V to VIN) to drive external P-channel MOSFETs with logic-level threshold requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5V to 9.8V - supports single/dual Li-ion, NiMH, and regulated 3.3V/5V rails without external LDO pre-regulation. |
| Switching Frequency | 550kHz (typ) - enables use of compact 4.7μH–10μH inductors and reduces EMI fundamental frequency. |
| Feedback Reference Voltage | 0.800V ±2.5% (–40°C to 85°C) - sets precise output voltage via external resistor divider; enables 0.8V–9.8V programmable outputs. |
| Quiescent Current | 270μA (normal), 8μA (shutdown) - extends battery life in always-on or low-duty-cycle portable devices. |
| UVLO Threshold | 2.00V (typ, falling) - prevents erratic operation and MOSFET stress during brownout or deep battery discharge. |
| Peak Sense Voltage | 105mV - determines current limit via RSENSE = 0.105V / IPEAK; enables accurate overcurrent protection. |
| Gate Drive Capability | PGATE sinks/sources >1A peak (<10μs), rise/fall time ≤40ns (CLOAD=3000pF) - ensures fast, low-loss switching of P-MOSFETs. |
Pinout & Package
Package: 6-lead TSOT-23 (S6), 1.90mm × 2.90mm × 0.85mm profile, thermal resistance θJA = 230°C/W, rated for –40°C to +85°C ambient operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ITH/RUN (Pin 1) | Error amplifier output & shutdown control | Pull below 0.35V to disable regulator; internal 0.5μA current source charges external compensation network on wake-up. |
| GND (Pin 2) | Power and signal reference ground | Must be low-impedance connection to PCB ground plane; serves as return for sense resistor, input capacitor, and feedback divider. |
| VFB (Pin 3) | Feedback input to error amplifier | Compares external resistive divider voltage against 0.8V reference; regulates output by adjusting ITH/RUN voltage. |
| SENSE– (Pin 4) | Negative current-sense comparator input | Connects directly to low-side of external sense resistor; senses voltage drop proportional to inductor peak 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) | External P-channel MOSFET gate driver | Swings from 0V to VIN; drives gate capacitance directly-no external level shifter required for P-MOSFETs. |
Key Features
| Feature | Design Value |
|---|---|
| Non-Burst Mode operation | Eliminates low-frequency switching at light loads, reducing output ripple to ~20mVP-P at 100mA vs. 60mVP-P for Burst Mode variants. |
| 100% duty-cycle dropout | Enables continuous conduction when VIN ≈ VOUT; maintains regulation down to (VIN − VDS(ON) − IOUTRSENSE − IOUTRDCR). |
| Accurate 0.8V reference | ±2.5% tolerance over full temperature range ensures stable output voltage across environmental conditions without calibration. |
| Integrated OVP & UVLO | OVP triggers at 0.860V (typ) on VFB with 20mV hysteresis; UVLO disables all circuitry below 2.0V, drawing only 8μA. |
| Current-mode control | Provides inherent cycle-by-cycle current limiting, fast transient response to load steps, and simplified loop compensation. |
Applications
| Cellular Telephones | Wireless Handheld Devices |
|---|---|
Use Scenario: Regulating 3.3V or 2.5V from dual-cell Li-ion (up to 8.4V) or single-cell (2.5V–4.2V) battery in GSM/UMTS handsets. IC Role / Device Role / Timing Role: Primary buck controller managing core processor and RF IC power domains with tight ripple and fast load transient response. Use Value: Enables 94% peak efficiency and <20mVP-P ripple at 100mA load-critical for noise-sensitive RF sections and audio codecs. |
Use Scenario: Powering Wi-Fi/BT modules and sensors in compact IoT edge nodes powered by coin-cell or single Li-ion batteries. IC Role / Device Role / Timing Role: High-efficiency step-down controller delivering 1.8V/2A with minimal board area using TSOT-23-6 and 4.7μH inductor. Use Value: 8μA shutdown current and 100% dropout extend usable battery range; 550kHz frequency avoids interference with 2.4GHz ISM band. |
| Portable Computers (Sub-notebooks) | Distributed 3.3V/2.5V Power Systems |
Use Scenario: Generating 1.8V core voltage for low-power microcontrollers or FPGAs in fanless portable computing platforms. IC Role / Device Role / Timing Role: Compact, high-current buck controller replacing larger SO-8 solutions; supports dynamic voltage scaling via ITH/RUN modulation. Use Value: TSOT-23-6 footprint saves >60% board area vs. MSOP-8 alternatives; ±2.5% VFB accuracy ensures reliable MCU operation across temperature. |
Use Scenario: Local point-of-load regulation in industrial controllers or telecom line cards where 5V or 12V backplane supplies 3.3V/2.5V subsystems. IC Role / Device Role / Timing Role: Standalone DC/DC controller driving discrete P-MOSFETs for robust, thermally manageable power conversion. Use Value: 270μA quiescent current minimizes no-load losses; wide 2.5V–9.8V input accommodates aging or unregulated rails. |
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 |
|---|---|---|---|
| LTC1772ES6#TRPBF | Burst Mode enabled; 60mVP-P ripple at 100mA vs. 20mVP-P for LTC1772BES6#TRPBF; higher light-load efficiency. | Better suited for battery-powered devices prioritizing runtime over low-noise performance (e.g., wearables). | Select LTC1772ES6#TRPBF if lowest quiescent power at microamp loads is critical; LTC1772BES6#TRPBF if low ripple in RF/audio sections is mandatory. |
| LTC1622CGN#PBF | 8-lead MSOP; supports sync-to-external clock (up to 750kHz); higher 4.5A output capability; includes optional Burst Mode. | Targeted at higher-current, multi-rail systems requiring synchronization or greater thermal headroom. | Choose LTC1622CGN#PBF for >2A loads or clock synchronization needs; LTC1772BES6#TRPBF remains optimal for space-constrained ≤2A designs. |
Compared with LTC1772ES6#TRPBF, LTC1772BES6#TRPBF trades light-load efficiency for significantly lower output ripple and deterministic constant-frequency operation-critical in noise-sensitive analog/RF circuits. Against LTC1622CGN#PBF, it offers 44% smaller footprint and simpler layout at the cost of current rating and sync capability.
Availability
LTC1772BES6#TRPBF is available at Aetrix Electronics and suitable for cellular telephones, wireless handheld devices, portable computers, and distributed 3.3V/2.5V power systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LTC1772BES6#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 pioneered high-performance DC/DC controllers with integrated features like current-mode control and low-IQ design.
The LTC1772BES6#TRPBF belongs to Linear's SOT-23 DC/DC controller family, engineered for ultra-compact, high-efficiency power conversion in battery-powered portable electronics where board space and EMI are critical constraints.
FAQ
What is the primary function of the LTC1772BES6#TRPBF in a power supply design?
The LTC1772BES6#TRPBF is a constant-frequency, current-mode step-down DC/DC controller that regulates output voltage by driving an external P-channel MOSFET. It uses feedback from a resistive divider on VFB and current sensing across an external resistor on SENSE– to maintain precise output voltage and protect against overcurrent. The LTC1772BES6#TRPBF does not integrate a power switch, enabling flexible MOSFET selection for optimized efficiency and thermal performance.
How does the LTC1772BES6#TRPBF differ from the LTC1772ES6#TRPBF?
The LTC1772BES6#TRPBF disables Burst Mode operation to maintain constant 550kHz switching frequency even at light loads, resulting in lower output voltage ripple (~20mVP-P at 100mA) but reduced light-load efficiency. In contrast, the LTC1772ES6#TRPBF enables Burst Mode, skipping cycles under light load to achieve higher efficiency at the expense of higher ripple (~60mVP-P). Both share identical pinout, package, and core specifications.
What is the recommended minimum external sense resistor value for the LTC1772BES6#TRPBF?
The LTC1772BES6#TRPBF uses a 105mV peak current sense threshold. For a target maximum output current of 2A with 40% ripple, RSENSE ≈ 0.0875Ω (calculated as 0.105V / (2A × 1.2)). The datasheet specifies RSENSE = 0.03Ω in the 2.5V/2A reference design. Values below 0.02Ω risk noise sensitivity and reduced accuracy; values above 0.1Ω limit maximum achievable current and increase I²R losses.
Can the LTC1772BES6#TRPBF operate with input voltages below 2.5V?
No-the absolute minimum input voltage for functional operation is 2.5V per the Electrical Characteristics table. Although the undervoltage lockout threshold is 2.0V (typ), the device requires ≥2.5V to ensure proper gate drive strength, reference stability, and current-sense amplifier accuracy. Operation below 2.5V may result in degraded regulation, increased dropout voltage, or failure to start.
What thermal considerations apply to the LTC1772BES6#TRPBF in high-current applications?
The LTC1772BES6#TRPBF has θJA = 230°C/W in the TSOT-23-6 package. At 270μA quiescent current and typical gate drive losses, junction temperature rise is modest-but PCB copper area under Pin 2 (GND) and thermal vias to inner layers are essential for high-output-current designs. Exceeding TJ = 150°C triggers thermal shutdown; derating is advised above 1A continuous load without enhanced cooling.
LTC1772BES6#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
LTC1772BES6#TRPBF FAQ
1.How can I place an order for LTC1772BES6#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1772BES6#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 LTC1772BES6#TRPBF reliable?
The price and inventory of LTC1772BES6#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1772BES6#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1772BES6#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1772BES6#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1772BES6#TRPBF?
LTC1772BES6#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1772BES6#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 LTC1772BES6#TRPBF?
For technical support, including LTC1772BES6#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1772BES6#TRPBF requirements.
6.How does Aetrix verify that LTC1772BES6#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1772BES6#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 LTC1772BES6#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1772BES6#TRPBF?
All LTC1772BES6#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1772BES6#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 LTC1772BES6#TRPBF part is unused and in its original packaging.
Return procedure for LTC1772BES6#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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