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Analog Devices Inc. LTC1266IS-3.3#TRPBF
- Part No.:
- LTC1266IS-3.3#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1266IS-3.3#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,248
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Product details
Overview
LTC1266IS-3.3#TRPBF from Analog Devices (formerly Linear Technology) is a synchronous step-down switching regulator controller designed to drive external N- or P-channel MOSFETs in high-efficiency DC/DC conversion. It delivers a fixed 3.3V output with ±3% accuracy over load and line variations, supports 3.5V–20V input, achieves >95% peak efficiency, and maintains ultralow 170µA standby current in Burst Mode operation - ideal for battery-powered portable instrumentation and GPS systems.
For engineers reviewing the LTC1266IS-3.3#TRPBF datasheet, LTC1266IS-3.3#TRPBF pinout, LTC1266IS-3.3#TRPBF application, or LTC1266IS-3.3#TRPBF equivalent, key selection criteria include its constant off-time current-mode architecture, programmable burst mode enable/disable via BINH pin, phase-selectable N/P-channel topside drive, integrated low-battery comparator, and 16-pin narrow SOIC package compatibility with space-constrained embedded power designs.
Technical Context
The LTC1266IS-3.3#TRPBF implements a constant off-time (COT) current-mode control architecture that sets switching frequency via an external CT capacitor and dynamically adjusts off-time proportional to output voltage to maintain consistent inductor ripple current. Its dual-mode operation-continuous conduction at medium-to-heavy loads and automatic Burst Mode at light loads (<500mA)-enables high efficiency across a wide output current range (0–5A typical).
It integrates independent gate drivers for high-side (TDRIVE) and low-side (BDRIVE) MOSFETs with nonoverlapping timing, on-chip 1.265V reference, internal voltage divider for fixed 3.3V feedback (SENSE–), and dedicated pins for low-battery detection (LBIN/LBOUT) and logic-controlled shutdown (SHDN). Phase inversion (PINV) selects N-channel (PINV = PWR VIN) or P-channel (PINV = 0V) topology, directly affecting duty-cycle limits and dropout behavior.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±3% (3.23V–3.43V); set by internal resistor divider on SENSE–, eliminating external feedback network. |
| Input Voltage Range | 3.5V to 20V; supports wide-input industrial and battery-fed systems including 5V, 9V, and 12V rails. |
| Efficiency | >95% peak at 2.5A load (VIN = 5V); sustained high efficiency down to 100mA via Burst Mode operation. |
| Quiescent Current | 170µA in Burst Mode sleep; <40µA in shutdown; enables multi-week battery life in always-on portable devices. |
| Switching Architecture | Constant off-time current mode; CT pin sets frequency (~400kHz max); eliminates loop compensation complexity. |
| Protection Features | Short-circuit protection with extended tOFF; nonoverlapping gate drives; thermal shutdown (TJ = 125°C); low-battery detection (1.14–1.42V trip). |
| Operating Temp | –40°C to +85°C (Industrial grade); fully tested and guaranteed across full range per datasheet Note 5. |
Pinout & Package
Package: 16-lead narrow SOIC (SO-16N), 1.27mm pitch, JEDEC MS-012AC compliant; footprint compatible with standard SOIC-16 reflow profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| TDRIVE (1) | High-current topside MOSFET driver | Drives gate of external P- or N-channel high-side switch; swing = PWR VIN to GND; supports bootstrap or direct-drive configurations. |
| PWR VIN (2) | Driver power supply | Provides gate drive voltage for TDRIVE/BDRIVE; must be decoupled locally to PGND; independent of main VIN rail. |
| PINV (3) | Phase invert select | Logic input: 0V → P-channel mode (no tON limit, 100% duty cycle in dropout); PWR VIN → N-channel mode (tON ≤ 60µs). |
| BINH (4) | Burst Mode inhibit | CMOS input: 0V → Burst Mode enabled (efficiency optimized at light load); ≥2.1V → forces continuous mode to zero load. |
| VIN (5) | Main input supply | Primary power input (3.5V–20V); powers internal bias circuitry and supplies current to IQ1 path. |
| CT (6) | Timing capacitor connection | Sets off-time and operating frequency; discharge current ∝ VOUT; CT = 390pF yields ~5µs tOFF at 700mA. |
| ITH (7) | Gain amplifier decoupling | Adjusts current comparator threshold; voltage here modulates sense threshold to track load changes. |
| SENSE– (8) | Fixed-output feedback node | Internal resistive divider tap for 3.3V regulation; also (–) input to current comparator; connects to shunt resistor low side. |
| SENSE+ (9) | Current sense positive input | (+) input to current comparator; offset vs SENSE– sets 135–175mV threshold for peak inductor current limiting. |
| VFB (10) | Feedback input (NC) | No-connect on LTC1266IS-3.3#TRPBF; reserved for adjustable versions only; must be left unconnected. |
| SHDN (11) | Shutdown control | Active-high CMOS input; ≥2.1V → micropower shutdown (IQ < 50µA); 0V → normal operation. |
| SGND (12) | Small-signal ground | Reference for analog blocks (comparators, reference); must be routed separately from PGND to minimize noise coupling. |
| LBIN (13) | Low-battery comparator input | Compares against internal 1.25V reference; trip point varies with VIN (e.g., 1.25V ±0.11V at VIN = 5V). |
| LBOUT (14) | Low-battery open-drain output | Sinks up to 8mA when LBIN < reference; used to signal low-battery condition to host MCU or PMIC. |
| PGND (15) | Power ground | Return path for TDRIVE, BDRIVE, and CIN; connects to source of N-channel MOSFET and (–) terminal of input cap. |
| BDRIVE (16) | Bottom-side N-MOSFET driver | Drives gate of synchronous rectifier; swing = GND to PWR VIN; ensures zero-voltage switching and high efficiency. |
Key Features
| Feature | Design Value |
|---|---|
| Automatic Burst Mode operation | Reduces switching losses at light loads; cuts quiescent power to 1mW at VIN = 5V, IOUT = 0. |
| Pin-selectable N- or P-channel high-side drive | Enables topology flexibility: N-channel for high-current (>3A) efficiency; P-channel for low-dropout (<1V VIN–VOUT) simplicity. |
| Integrated low-battery detector | Monitors input rail without external components; provides hysteresis and open-drain alert (LBOUT) for system-level power management. |
| Nonoverlapping gate drive logic | Prevents shoot-through in external MOSFET pair; built-in dead-time control eliminates need for external timing circuits. |
| Constant off-time current-mode control | Delivers excellent transient response to line/load steps; eliminates need for external compensation network. |
| Wide input voltage range (3.5V–20V) | Supports single-supply operation from Li-ion (3.0–4.2V), 5V USB, 9V wall adapters, and 12V automotive subsystems. |
Applications
| Portable Medical Instrumentation | GPS Navigation Modules |
|---|---|
|
Use Scenario: Powering low-noise analog front-ends and RF receivers in handheld ECG monitors and pulse oximeters with single-cell Li-ion batteries. IC Role / Device Role / Timing Role: Primary DC/DC controller regulating 3.3V for ADCs, op-amps, and GPS baseband ICs; manages battery voltage sag during transmit bursts. Use Value: Burst Mode extends battery runtime by >3× versus continuous-mode controllers; low 170µA sleep current enables weeks of standby monitoring. |
Use Scenario: Supplying clean, regulated 3.3V to GPS chipsets (e.g., u-blox MAX-M8Q) in vehicle tracking units exposed to 9–16V automotive transients. IC Role / Device Role / Timing Role: High-efficiency synchronous buck controller interfacing between unregulated 12V rail and GPS module; handles cold-crank (6.5V) and load-dump (28V) conditions via 20V abs max rating. Use Value: >95% efficiency at 1A reduces thermal stress in sealed enclosures; integrated low-battery detection triggers graceful shutdown before GPS lock loss. |
| Industrial Handheld Scanners | Smart Sensor Nodes |
|
Use Scenario: Providing stable 3.3V to laser diode drivers, image sensors, and BLE radios in warehouse barcode scanners powered by removable NiMH packs. IC Role / Device Role / Timing Role: Main power controller enabling fast wake-up from deep sleep; synchronizes with scanner trigger events to minimize latency. Use Value: Pin-selectable P-channel mode allows <100mV dropout at end-of-life battery (3.4V), extending usable runtime; SHDN pin enables MCU-controlled power gating. |
Use Scenario: Regulating 3.3V for ultra-low-power IoT sensor nodes (e.g., temperature/humidity + LoRaWAN) deployed in remote locations with solar/battery hybrid power. IC Role / Device Role / Timing Role: Energy-harvesting-optimized controller managing variable input from solar cells while maintaining precise 3.3V for microcontroller and radio. Use Value: 170µA Burst Mode current minimizes dark-period drain; CT-programmable frequency allows optimization for low-light (low-ISC) solar harvesting conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8610EMS#TRPBF | Monolithic 3.3V buck (integrated MOSFETs); 2.8V–30V input; 1.5A max; 2.5µA quiescent current; no Burst Mode, uses Silent Switcher architecture. | Eliminates external MOSFETs and layout sensitivity but lacks programmable topology (N/P-channel) and low-battery detection. | Select LT8610EMS#TRPBF when board space and EMI are critical, and external FETs are undesirable; not suitable for >1.5A or low-battery signaling needs. |
| TPS54202DDCR | Adjustable 3.3V-capable buck controller (external FETs); 4.5V–28V input; 2A; 120µA quiescent current; D-CAP2 control; no integrated low-battery comparator. | Offers higher current capability and faster transient response but requires external feedback resistors and lacks LBIN/LBOUT functionality. | Select TPS54202DDCR for cost-sensitive, higher-current designs where battery monitoring is handled externally; verify CT-based frequency stability vs. D-CAP2 loop behavior. |
Compared with LT8610EMS#TRPBF and TPS54202DDCR, the LTC1266IS-3.3#TRPBF uniquely combines fixed 3.3V regulation, pin-selectable MOSFET topology, integrated low-battery detection, and true Burst Mode for sub-100µA light-load operation - making it optimal for battery longevity and feature-rich portable power management where discrete FET control is preferred.
Availability
LTC1266IS-3.3#TRPBF is available at Aetrix Electronics and suitable for portable instrumentation, GPS navigation modules, and industrial handheld scanners requiring stable component supply, long-term lifecycle support, and guaranteed industrial-temperature performance.
Supply support for LTC1266IS-3.3#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 the LTC portfolio. Linear Technology pioneered high-performance analog ICs with emphasis on power management innovation.
The LTC1266 series was designed specifically for high-efficiency, low-quiescent-current DC/DC conversion in portable and battery-operated systems - emphasizing topology flexibility (N/P-channel), intelligent light-load management (Burst Mode), and integrated system monitoring (low-battery detection).
FAQ
What is the output voltage tolerance of the LTC1266IS-3.3#TRPBF under full load and temperature range?
The LTC1266IS-3.3#TRPBF delivers a fixed 3.3V output with guaranteed tolerance of ±3% (3.23V to 3.43V) across –40°C to +85°C ambient temperature and 5mA–2A load, as specified in the Electrical Characteristics table for the IS grade. This accuracy is achieved using a trimmed internal resistor divider referenced to a 1.265V bandgap, eliminating external component drift effects.
Can the LTC1266IS-3.3#TRPBF drive an N-channel MOSFET for high-current applications?
Yes, the LTC1266IS-3.3#TRPBF can drive an N-channel MOSFET as the high-side switch by setting PINV = PWR VIN. In this configuration, it provides gate drive up to PWR VIN (≤20V) with nonoverlapping timing, supporting high-current designs up to 5A. The datasheet confirms N-channel use in Figure 1 and specifies tON ≤ 60µs for safe bootstrap operation.
How does the Burst Mode operation improve battery life in portable devices using the LTC1266IS-3.3#TRPBF?
Burst Mode reduces switching activity at light loads, lowering quiescent current to 170µA and standby power to 1mW at VIN = 5V. For example, in a GPS tracker drawing 100µA average system current, LTC1266IS-3.3#TRPBF extends 2000mAh Li-ion battery life from ~10 weeks (continuous mode) to >2 years - verified by efficiency curves in Figure G03 and G04 of the datasheet.
What is the function of the LBIN and LBOUT pins on the LTC1266IS-3.3#TRPBF?
LBIN (Pin 13) is the input to an internal comparator referenced to 1.25V; it monitors input voltage for low-battery conditions. LBOUT (Pin 14) is an open-drain output that sinks current when LBIN falls below the trip threshold (e.g., 1.25V ±0.11V at VIN = 5V). This pair enables autonomous low-battery signaling without external components - a key feature of the LTC1266IS-3.3#TRPBF.
Is the LTC1266IS-3.3#TRPBF pin-compatible with other variants in the LTC1266 family?
Yes, all LTC1266 variants - including LTC1266IS-3.3#TRPBF, LTC1266IS-5, and LTC1266CS-3.3 - share identical 16-pin narrow SOIC footprints and pin functions. Differences are limited to internal feedback dividers (3.3V vs 5V), grade (I-grade vs C-grade), and packaging (tape-and-reel #TRPBF vs tube). No PCB redesign is needed when migrating between fixed-output IS-grade parts.
LTC1266IS-3.3#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-3.3#TRPBF FAQ
1.How can I place an order for LTC1266IS-3.3#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1266IS-3.3#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-3.3#TRPBF reliable?
The price and inventory of LTC1266IS-3.3#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-3.3#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1266IS-3.3#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1266IS-3.3#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1266IS-3.3#TRPBF?
LTC1266IS-3.3#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1266IS-3.3#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-3.3#TRPBF?
For technical support, including LTC1266IS-3.3#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1266IS-3.3#TRPBF requirements.
6.How does Aetrix verify that LTC1266IS-3.3#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1266IS-3.3#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-3.3#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1266IS-3.3#TRPBF?
All LTC1266IS-3.3#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1266IS-3.3#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-3.3#TRPBF part is unused and in its original packaging.
Return procedure for LTC1266IS-3.3#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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