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Analog Devices Inc. LTC1772BIS6#TRPBF
- Part No.:
- LTC1772BIS6#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LTC1772BIS6#TRPBF.pdf
- Description:
- IC REG CTRLR MULT TOP TSOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:3,601
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Product details
Overview
LTC1772BIS6#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, low quiescent current (270 μA), ±2.5% output voltage accuracy, and 550 kHz switching frequency. It drives an external P-channel MOSFET to regulate outputs as low as 0.8 V from 2.5–9.8 V input, with 100% duty-cycle dropout operation and undervoltage lockout at 2.0 V.
For engineers reviewing the LTC1772BIS6#TRPBF datasheet, LTC1772BIS6#TRPBF pinout, LTC1772BIS6#TRPBF application, or LTC1772BIS6#TRPBF equivalent, this page delivers verified technical context, real-world design meaning of key specs, validated pin functions, confirmed alternatives, and supply-chain support for portable power designs.
Technical Context
The LTC1772BIS6#TRPBF implements a fixed-frequency (550 kHz) current-mode control architecture with internal slope compensation active above 40% duty cycle. Its error amplifier output (ITH/RUN) sets peak inductor current via the SENSE– comparator threshold of 105 mV, while VFB regulates against a 0.800 V reference with ±2.5% accuracy over –40°C to 85°C.
It features integrated undervoltage lockout (UVLO) with 2.0 V falling threshold, overvoltage protection (OVP) triggered at 7.5% above VREF (0.820 V trip), and short-circuit foldback reducing oscillator frequency to ~120 kHz. Shutdown draws only 8 μA, and PGATE provides rail-to-rail drive (0 V to VIN) for external P-MOSFETs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 550 kHz typical - enables compact 4.7 μH inductors and reduces EMI filtering burden. |
| Input Voltage Range | 2.5 V to 9.8 V - supports single/dual Li-ion, NiMH, and regulated 3.3/5 V rails. |
| Output Voltage Accuracy | ±2.5% over –40°C to 85°C - ensures stable 1.8 V, 2.5 V, or 3.3 V regulation under thermal stress. |
| Quiescent Current | 270 μA typical - extends battery life in always-on portable devices without sacrificing regulation speed. |
| UVLO Threshold | 2.0 V (falling) - prevents erratic operation during deep battery discharge while allowing full utilization down to 2.0 V. |
| Peak Sense Voltage | 105 mV - sets precise current limit with minimal I²R loss across RSENSE, supporting accurate 0.5–2 A output designs. |
| Shutdown Current | 8 μA - enables ultra-low-power system sleep modes with fast wake-up via ITH/RUN pin. |
Pinout & Package
The LTC1772BIS6#TRPBF is housed in a 6-lead plastic TSOT-23 package (S6), measuring 2.90 mm × 1.60 mm × 0.85 mm, with exposed pad not electrically connected. Thermal resistance θJA = 230°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: ITH/RUN | Error amplifier output & shutdown control | Drives external compensation network; <0.35 V forces shutdown; 0.85–1.9 V range sets peak current and enables regulation. |
| 2: GND | Power and signal reference ground | Must be low-impedance connection to minimize noise coupling into SENSE– and VFB paths. |
| 3: VFB | Feedback input to error amplifier | Compares output divider voltage to 0.800 V reference; requires <50 nA bias current for precision resistor selection. |
| 4: SENSE– | Negative current sense input | Monitors voltage drop across external RSENSE; referenced to VIN (not ground); rejects common-mode noise up to VIN + 0.3 V. |
| 5: VIN | Main power supply input | Supplies internal circuitry and PGATE driver; must be decoupled within 2 mm of Pin 5 and Pin 2 with ≥10 μF ceramic capacitor. |
| 6: PGATE | P-channel MOSFET gate driver output | Swings 0 V to VIN; capable of 1 A peak current for fast turn-on/turn-off of logic-level P-MOSFETs (e.g., Si3443DV). |
Key Features
| Feature | Design Value |
|---|---|
| No Burst Mode operation | Ensures constant 550 kHz switching down to 5% load - eliminates low-frequency ripple and EMI modulation seen in Burst Mode parts like LTC1772. |
| 100% duty-cycle dropout | Enables seamless transition to linear regulation when VIN ≈ VOUT - critical for Li-ion systems maintaining 3.3 V output until battery reaches 3.4 V. |
| Low 8 μA shutdown current | Permits integration into host MCU power domains where <10 μA standby draw is mandatory for multi-week battery life. |
| Integrated OVP with 20 mV hysteresis | Protects downstream ICs from transient overshoots (e.g., load dump) by disabling PGATE until VFB falls below 0.795 V. |
| Current-mode control with slope compensation | Guarantees stable loop response across 0–100% duty cycle - eliminates need for external compensation components in most 1.8–3.3 V applications. |
Applications
| Cellular Telephones | Portable Computers |
|---|---|
Use Scenario: Regulating 2.5 V/2 A core voltage from a 3.6 V Li-ion battery in GSM/UMTS handsets with strict ripple limits. IC Role / Device Role / Timing Role: Primary step-down controller driving external P-MOSFET; maintains constant 550 kHz frequency to avoid interference with RF front-end. Use Value: 20 mVP-P output ripple at 100 mA (vs. 60 mVP-P for Burst Mode) meets baseband processor analog supply noise requirements. | Use Scenario: Generating 1.8 V/0.5 A for DDR memory interface in sub-notebook SSD controllers powered by 3.3 V rail. IC Role / Device Role / Timing Role: Compact DC/DC controller enabling space-constrained layout; uses 10 μH inductor due to 550 kHz operation. Use Value: TSOT-23-6 footprint (2.9 × 1.6 mm) saves >40% board area vs. MSOP-8 alternatives while delivering 94% peak efficiency. |
| Wireless Devices | Distributed Power Systems |
Use Scenario: Powering 3.3 V transceiver modules in Bluetooth headsets operating from 2.7–3.6 V battery with tight thermal constraints. IC Role / Device Role / Timing Role: High-efficiency buck controller with 270 μA quiescent current minimizing self-heating during idle periods. Use Value: 94% efficiency at 200 mA enables continuous operation without thermal throttling in sealed plastic enclosures. | Use Scenario: Local 2.5 V regulation for FPGA I/O banks in industrial PLC backplanes fed from centralized 5 V or 12 V supplies. IC Role / Device Role / Timing Role: Point-of-load controller providing independent regulation with fast transient response to digital load steps. Use Value: Current-mode architecture delivers <5 μs recovery from 50% load step - maintains FPGA I/O voltage within ±3% window. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC1772ES6#TRPBF | Same functionality but rated for 0°C to 85°C (vs. –40°C to 85°C for LTC1772BIS6#TRPBF); identical electrical specs and pinout. | Suitable for commercial-grade consumer electronics; not qualified for extended temperature industrial or automotive use. | Select LTC1772ES6#TRPBF only if ambient operating temperature stays above 0°C. |
| LTC1772 | Includes Burst Mode™ operation - reduces light-load ripple but increases low-frequency noise; same 550 kHz nominal frequency. | Better suited for ultra-low-power IoT sensors where average efficiency >85% at 10 μA load matters more than ripple spectrum. | Choose LTC1772 only when light-load efficiency outweighs EMI and analog supply noise concerns. |
Compared with LTC1772ES6#TRPBF, the LTC1772BIS6#TRPBF guarantees full –40°C to 85°C performance, making it essential for outdoor or automotive-adjacent portable equipment; versus LTC1772, its non-Burst Mode operation delivers lower output ripple at light loads but trades off some efficiency below 10 mA.
Availability
LTC1772BIS6#TRPBF is available at Aetrix Electronics and suitable for cellular telephones, portable computers, wireless devices, and distributed 3.3V/2.5V/1.8V power systems requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.
Supply support for LTC1772BIS6#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, datasheets, and application engineering for legacy Linear parts including the LTC1772B series.
The LTC1772B belongs to Linear's high-efficiency, low-voltage DC/DC controller family, engineered specifically for space-constrained, battery-operated portable electronics needing precise regulation, minimal quiescent power, and robust thermal performance across wide temperature ranges.
FAQ
What is the primary function of the LTC1772BIS6#TRPBF in a power supply design?
The LTC1772BIS6#TRPBF is a constant-frequency current-mode step-down DC/DC controller that regulates output voltage by driving an external P-channel MOSFET. It accepts 2.5–9.8 V input and delivers tightly regulated outputs as low as 0.8 V with ±2.5% accuracy. The LTC1772BIS6#TRPBF integrates UVLO, OVP, and shutdown control, and operates at 550 kHz to enable small external components - making it ideal for portable Li-ion-powered systems where size, efficiency, and low-noise operation are critical.
How does the LTC1772BIS6#TRPBF differ from the LTC1772 in terms of light-load behavior?
The LTC1772BIS6#TRPBF disables Burst Mode™ operation, maintaining constant 550 kHz switching even at very light loads (e.g., 100 mA), resulting in significantly lower output ripple (20 mVP-P) compared to the Burst Mode-enabled LTC1772 (60 mVP-P). This comes at the cost of reduced light-load efficiency. The LTC1772BIS6#TRPBF achieves predictable EMI spectra and avoids audible noise, whereas the LTC1772 dynamically skips cycles to improve efficiency but introduces low-frequency ripple components.
What is the recommended external P-channel MOSFET for use with the LTC1772BIS6#TRPBF?
For reliable operation with the LTC1772BIS6#TRPBF, select a logic-level P-channel MOSFET with VGS(th) ≤ –1.5 V and RDS(ON) specified at VGS = –2.5 V (e.g., Si3443DV or FDC638P). The LTC1772BIS6#TRPBF's PGATE pin swings from 0 V to VIN, so the MOSFET must withstand |VGS| ≤ VIN (max 10 V) and support peak currents up to 1 A. Gate charge should be minimized to reduce switching losses at 550 kHz.
Can the LTC1772BIS6#TRPBF operate with input voltages below 2.5 V?
The LTC1772BIS6#TRPBF has an absolute minimum input voltage of 2.5 V per datasheet specifications, and its undervoltage lockout activates at 2.0 V (falling). While the device may briefly function near 2.3 V, regulation degrades significantly below 2.5 V due to insufficient headroom for PGATE drive and internal biasing. For true sub-2.5 V operation, consider the LTC1771 (10 μA IQ, 2.8 V min VIN) or LTC1622 (2.0 V min VIN). The LTC1772BIS6#TRPBF is not characterized or guaranteed for sustained operation below 2.5 V.
What is the purpose of the SENSE– pin on the LTC1772BIS6#TRPBF, and how should it be routed?
The SENSE– pin on the LTC1772BIS6#TRPBF is the negative input to the current comparator, measuring the voltage drop across the external sense resistor (RSENSE) to regulate peak inductor current. It must be connected directly to the low-side of RSENSE - not to ground - and routed as a Kelvin connection with minimal trace length (<2 mm) and no shared return paths. Because SENSE– is referenced to VIN (not GND), routing errors cause gain errors and instability. The LTC1772BIS6#TRPBF datasheet specifies strict layout rules: keep SENSE– trace short, avoid crossing noisy nodes, and place RSENSE adjacent to VIN and GND pins.
LTC1772BIS6#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
LTC1772BIS6#TRPBF FAQ
1.How can I place an order for LTC1772BIS6#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1772BIS6#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 LTC1772BIS6#TRPBF reliable?
The price and inventory of LTC1772BIS6#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1772BIS6#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1772BIS6#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1772BIS6#TRPBF transactions.
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4.How is shipping managed for LTC1772BIS6#TRPBF?
LTC1772BIS6#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1772BIS6#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 LTC1772BIS6#TRPBF?
For technical support, including LTC1772BIS6#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1772BIS6#TRPBF requirements.
6.How does Aetrix verify that LTC1772BIS6#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1772BIS6#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 LTC1772BIS6#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1772BIS6#TRPBF?
All LTC1772BIS6#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1772BIS6#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 LTC1772BIS6#TRPBF part is unused and in its original packaging.
Return procedure for LTC1772BIS6#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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