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Analog Devices Inc. LTC1266IS#TRPBF
- Part No.:
- LTC1266IS#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1266IS#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,882
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Product details
Overview
LTC1266IS#TRPBF from Analog Devices (formerly Linear Technology) is a synchronous step-down switching regulator controller driving external N- or P-channel MOSFETs for high-efficiency DC/DC conversion. It features constant off-time current mode control, pin-selectable Burst Mode™ operation, 1% output voltage accuracy (LTC1266A variant), wide 3.5V–20V input range, and integrated low-battery detection - used in portable computing power rails.
For engineers reviewing the LTC1266IS#TRPBF datasheet, LTC1266IS#TRPBF pinout, LTC1266IS#TRPBF application, or LTC1266IS#TRPBF equivalent, key selection criteria include its 16-pin SOIC package, dual-VIN architecture (VIN/PWR VIN), phase-invert (PINV) and burst-inhibit (BINH) configuration pins, and support for both N-channel (high-current) and P-channel (low-dropout) topside switches.
Technical Context
The LTC1266IS#TRPBF implements a constant off-time (COT) current mode architecture with externally programmable timing via CT pin (390pF typical), delivering up to 400kHz switching frequency. Its dual-VIN structure separates main supply (Pin 5) from gate drive power (Pin 2), enabling robust high-side driver performance independent of input rail fluctuations.
It supports two distinct operating modes: continuous conduction mode (CCM) for stable light-to-heavy loads, and automatic Burst Mode™ (enabled by default) for ultralow quiescent current (170µA) at light loads - maintaining >95% efficiency down to ~100mA while suppressing audible noise and minimizing standby power loss.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5V to 20V - supports single-cell Li-ion through 12V industrial rails without external regulators. |
| Feedback Voltage | 1.265V (typ) - sets output via external divider (adjustable version) or internal resistor network (fixed 3.3V/5V variants). |
| Current Sense Threshold | 135–190mV (Burst Mode enabled) - defines peak inductor current; determines max output current with RSENSE. |
| Off-Time | 3.8–7.0µs - fixed off-time governs minimum on-time and dropout behavior; scales with VOUT via CT discharge current. |
| Quiescent Current | 170µA (Sleep Mode), <40µA (Shutdown) - enables multi-day battery life in always-on portable systems. |
| Low-Battery Detection | 1.14–1.42V trip point - configurable hysteresis-free comparator with open-drain LBOUT output for system-level brownout signaling. |
| Operating Temp Range | –40°C to +85°C - fully tested and guaranteed (I-grade), suitable for industrial and automotive under-hood edge cases. |
Pinout & Package
Package: 16-lead narrow SOIC (SO-16N), 1.27mm pitch, JEDEC MS-012AC compliant. Thermal resistance θJA = 110°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| TDRIVE (1) | Topside MOSFET gate driver output | High-current push-pull output (PWR VIN ↔ GND); phase set by PINV for N- or P-channel compatibility. |
| PWR VIN (2) | Dedicated gate drive supply input | Decoupled local power rail for driver stage; isolates gate drive integrity from noisy main VIN. |
| PINV (3) | Phase invert control | Logic-selectable driver polarity: 0V → P-channel mode (100% duty cycle in dropout); PWR VIN → N-channel mode. |
| BINH (4) | Burst Mode inhibit | CMOS-high disables Burst Mode, forcing continuous operation down to zero load - eliminates output ripple at cost of higher IQ. |
| VIN (5) | Main input supply | Primary power source for internal logic and bias circuits; absolute max 20V. |
| CT (6) | Timing capacitor connection | Sets off-time and operating frequency; discharge current proportional to VOUT ensures consistent ripple across input range. |
| ITH (7) | Gain amplifier decoupling | Stabilizes current comparator threshold; voltage here modulates sense threshold to track load changes. |
| SENSE– (8) | Current comparator (–) input / VOUT sense | Internal resistive divider tap for fixed-output versions; also serves as current-sense reference node. |
| SENSE+ (9) | Current comparator (+) input | Connects to shunt resistor high side; built-in offset vs SENSE– sets precise current trip level (25–190mV). |
| VFB (10) | Feedback input (adjustable only) | Not connected in LTC1266IS-3.3/LTC1266IS-5; used with external resistor divider to set VOUT in base LTC1266IS. |
| SHDN (11) | Shutdown control | Active-high CMOS input; <0.8V = normal operation, >2V = micropower shutdown (<50µA total IQ). |
| SGND (12) | Small-signal ground | Separate analog ground return for feedback/sense paths; must be routed independently from PGND to avoid noise coupling. |
| LBIN (13) | Low-battery comparator input | Monitors external voltage against 1.25V internal reference; no external components required for basic brownout detection. |
| LBOUT (14) | Low-battery open-drain output | Sinks current when LBIN < 1.25V; directly interfaces with microcontroller GPIO or reset supervisor ICs. |
| PGND (15) | Power ground | Return path for TDRIVE/BDRIVE drivers and CIN; connects to source of N-channel MOSFET and CIN (–). |
| BDRIVE (16) | Bottom-side N-MOSFET driver | High-current output (GND ↔ PWR VIN); synchronized non-overlapping drive prevents shoot-through. |
Key Features
| Feature | Design Value |
|---|---|
| Automatic Burst Mode™ Operation | Maintains >95% efficiency at light loads (0–500mA) by entering sleep mode; reduces IQ to 170µA and eliminates switching losses. |
| Synchronous Switching with Nonoverlapping Gate Drives | Hardware-enforced dead time prevents cross-conduction; eliminates need for external timing logic or complex gate drivers. |
| Pin-Selectable Topside MOSFET Type | PINV pin selects N-channel (high-current, lower RDS(ON)) or P-channel (low-dropout, 100% duty cycle) topology - one controller fits both use cases. |
| Integrated Low-Battery Detector | Single-pin solution (LBIN/LBOUT) with factory-trimmed 1.25V reference; requires no external resistors or calibration for basic system brownout response. |
| Constant Off-Time Current Mode Control | Delivers excellent line/load transient response and inherent cycle-by-cycle current limiting; simplifies loop compensation vs voltage-mode controllers. |
Applications
| Portable Computing Power Rail | Industrial Sensor Node Supply |
|---|---|
Use Scenario: Regulating 5V or 3.3V from a 7–12V battery pack in notebook or palmtop computers where thermal headroom and battery life are critical. IC Role / Device Role / Timing Role: Primary synchronous buck controller managing high-current CPU/I/O rails with adaptive Burst Mode™ to extend runtime during idle states. Use Value: Achieves >95% efficiency at 2.5A load and 170µA quiescent current in sleep mode - directly enabling multi-hour battery operation without forced fan cooling. | Use Scenario: Providing stable 3.3V supply to ultra-low-power wireless sensor nodes (e.g., LoRaWAN, NB-IoT) powered by coin cells or energy harvesters. IC Role / Device Role / Timing Role: High-efficiency DC/DC controller enabling long-term autonomous operation; LBOUT pin triggers MCU wake-up on battery depletion. Use Value: 170µA sleep current and programmable low-battery alert reduce system-level power budget by >30% versus linear regulators or non-Burst controllers. |
| GPS Receiver Front-End | DC Power Distribution System |
Use Scenario: Generating clean 3.3V supply for GPS RF front-end and baseband processor in automotive or handheld navigation units. IC Role / Device Role / Timing Role: Low-noise synchronous controller with Burst Mode™ disabled (via BINH) to eliminate switching ripple near sensitive RF circuitry. Use Value: Continuous-mode operation suppresses sub-harmonic artifacts in GPS band; <40µA shutdown IQ preserves battery during vehicle ignition-off periods. | Use Scenario: Centralized 5V regulation in distributed power architectures (e.g., telecom line cards, test equipment backplanes) fed from 12V or 24V intermediate bus. IC Role / Device Role / Timing Role: High-reliability controller supporting P-channel MOSFET for <100mV dropout at full load - maintains regulation during brownout events. Use Value: Pin-selectable P-channel mode delivers true low-dropout behavior without external bootstrap components, reducing BOM count and layout complexity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8610IMSE#TRPBF | Monolithic 3.5A buck regulator (integrated MOSFETs); 2.8–30V input; 35ns min on-time; Silent Switcher® architecture. | Eliminates external FETs and gate drive design effort but lacks PINV/BINH configurability and low-battery detector. | Select when board space and design cycle time are constrained; avoid when P-channel topology or system-level brownout signaling is required. |
| TPS54202DDCR | 2A integrated buck converter; 4.5–28V input; Eco-mode™ (similar to Burst Mode); no low-battery comparator; different pinout and compensation scheme. | Lower cost and smaller footprint, but requires external circuitry for battery monitoring and offers less precise light-load efficiency tuning. | Select for cost-sensitive consumer applications where LBOUT functionality is unnecessary and 2A output suffices. |
Compared with LT8610IMSE#TRPBF and TPS54202DDCR, the LTC1266IS#TRPBF provides unique flexibility in MOSFET topology selection (N/P-channel), integrated low-battery signaling, and fine-grained Burst Mode control - making it optimal for industrial and portable designs requiring long battery life, wide input range, and system-level power management coordination.
Availability
LTC1266IS#TRPBF is available at Aetrix Electronics and suitable for portable computing power rails, industrial sensor node supplies, GPS receiver front-ends, and DC power distribution systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC1266IS#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, Inc. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing technologies, formed through the acquisition of Linear Technology in 2017.
The LTC1266IS#TRPBF belongs to ADI's legacy Linear Technology power management portfolio, designed specifically for high-efficiency, flexible synchronous DC/DC conversion in battery-powered and thermally constrained applications - emphasizing configurability, low IQ, and system-level integration features like low-battery detection.
FAQ
What is the maximum input voltage rating for the LTC1266IS#TRPBF?
The LTC1266IS#TRPBF has an absolute maximum input voltage rating of 20V on both VIN (Pin 5) and PWR VIN (Pin 2). Operation above 18V is not recommended for continuous use due to increased power dissipation and potential reliability impact. The device is specified for reliable operation from 3.5V to 18V, with 20V as the absolute limit per Absolute Maximum Ratings table.
How does the PINV pin affect the LTC1266IS#TRPBF's operation in P-channel vs N-channel mode?
When PINV (Pin 3) is grounded, the LTC1266IS#TRPBF configures TDRIVE for P-channel MOSFET operation - enabling 100% duty cycle in dropout and eliminating bootstrap complexity. When PINV is tied to PWR VIN, it selects N-channel mode - providing lower RDS(ON) and higher current capability but requiring careful gate drive design. The PINV state also sets the maximum on-time limit (60µs in N-channel mode, unlimited in P-channel mode).
Can the LTC1266IS#TRPBF be used with a fixed 3.3V output without external resistors?
Yes - the LTC1266IS#TRPBF is the base adjustable version, but the pin-compatible LTC1266IS-3.3 variant integrates the feedback divider internally and outputs a fixed 3.3V ±3% (3.23V–3.43V) without external resistors. For the LTC1266IS#TRPBF itself, VFB (Pin 10) must be connected to an external resistor divider between VOUT and SGND to set the output voltage.
What is the purpose of the LBIN and LBOUT pins on the LTC1266IS#TRPBF?
The LBIN (Pin 13) and LBOUT (Pin 14) form a dedicated low-battery detection circuit. LBIN compares an external voltage to an internal 1.25V reference; when LBIN falls below this threshold, LBOUT (open-drain) pulls low to signal brownout condition. This allows direct interface with microcontrollers or PMICs without external comparators or voltage dividers - a key differentiator of the LTC1266IS#TRPBF in portable systems.
Does the LTC1266IS#TRPBF support both continuous and Burst Mode™ operation simultaneously?
No - the LTC1266IS#TRPBF automatically transitions between continuous conduction mode (CCM) and Burst Mode™ based on load current. At medium-to-heavy loads, it operates in CCM for lowest ripple and best transient response. As load decreases below ~100–500mA (depending on RSENSE and VOUT), it enters Burst Mode™ to minimize switching losses and reduce IQ to 170µA. Burst Mode™ can be disabled via BINH (Pin 4) to force continuous operation down to zero load.
LTC1266IS#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Type:
- Transistor Driver
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Number of Outputs:
- 1
- Output Phases:
- 1
- Voltage - Supply (Vcc/Vdd):
- 3.5V ~ 18V
- Frequency - Switching:
- Up to 400kHz
- Duty Cycle (Max):
- 100%
- Synchronous Rectifier:
- Yes
- Clock Sync:
- No
- Serial Interfaces:
- -
- Control Features:
- Enable
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SO
LTC1266IS#TRPBF FAQ
1.How can I place an order for LTC1266IS#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1266IS#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 LTC1266IS#TRPBF reliable?
The price and inventory of LTC1266IS#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1266IS#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1266IS#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1266IS#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1266IS#TRPBF?
LTC1266IS#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1266IS#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 LTC1266IS#TRPBF?
For technical support, including LTC1266IS#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1266IS#TRPBF requirements.
6.How does Aetrix verify that LTC1266IS#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1266IS#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 LTC1266IS#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1266IS#TRPBF?
All LTC1266IS#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1266IS#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 LTC1266IS#TRPBF part is unused and in its original packaging.
Return procedure for LTC1266IS#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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