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Analog Devices Inc. LTC1266CS-3.3#TRPBF
- Part No.:
- LTC1266CS-3.3#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1266CS-3.3#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,346
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Product details
Overview
LTC1266CS-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 input voltages from 3.5V to 20V, maintains >95% peak efficiency, and features automatic Burst Mode™ operation for ultralow quiescent current (170µA) at light loads - ideal for battery-powered portable instruments and GPS systems.
For engineers reviewing the LTC1266CS-3.3#TRPBF datasheet, LTC1266CS-3.3#TRPBF pinout, LTC1266CS-3.3#TRPBF application, or LTC1266CS-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 topside driver (PINV), integrated low-battery comparator (LBIN/LBOUT), and compatibility with both N- and P-channel high-side switches.
Technical Context
The LTC1266CS-3.3#TRPBF implements a constant off-time (COT) current-mode control architecture that sets switching frequency via an external CT capacitor and regulates output by comparing sensed inductor current (across RSENSE) against a voltage threshold derived from VSENSE– and VSENSE+. Its dual-mode operation-continuous conduction at medium-to-heavy loads and Burst Mode™ at light loads-enables stable regulation while minimizing switching losses below ~500mA.
Internal circuitry includes independent VIN and PWR VIN supplies, separate small-signal (SGND) and power (PGND) grounds, logic-controlled micropower shutdown (IQ < 40µA), nonoverlapping gate drives to prevent shoot-through, and a built-in 1.25V low-battery reference with open-drain LBOUT output. The fixed 3.3V version uses internal resistive feedback (SENSE– pin tied to internal divider), eliminating need for external resistor network.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±3% (3.23V–3.43V) - tightly regulated without external feedback resistors |
| Input Voltage Range | 3.5V to 20V - supports wide industrial and battery-derived rails including 5V, 9V, 12V, and 19V inputs |
| Efficiency | >95% peak - achieved via synchronous rectification and optimized gate drive timing |
| Quiescent Current | 170µA in Burst Mode - enables multi-day battery life in standby for portable devices |
| Switching Architecture | Constant off-time current mode - provides inherent stability, fast transient response, and ripple-current proportional control |
| Protection Features | Short-circuit protection, logic-controlled shutdown (IQ < 40µA), low-battery detection (1.14–1.42V trip), and nonoverlapping gate drives |
| Operating Temp | 0°C to 70°C (Commercial grade) - validated for notebook, palmtop, and cellular telephone environments |
Pinout & Package
Package: 16-pin narrow SOIC (SO-16), surface-mount, RoHS-compliant, moisture-sensitive level 3.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| TDRIVE (Pin 1) | Topside MOSFET gate driver output | High-current push-pull output driving P-channel (0V–PWR VIN) or N-channel (ground–PWR VIN) switch |
| PWR VIN (Pin 2) | Power supply for gate drivers | Must be decoupled locally to PGND; powers TDRIVE and BDRIVE outputs independently of main VIN |
| PINV (Pin 3) | Phase invert select | Logic-low = P-channel mode (100% duty cycle in dropout); logic-high = N-channel mode (60µs max on-time) |
| BINH (Pin 4) | Burst Mode inhibit | CMOS-high disables Burst Mode, forcing continuous operation down to zero load |
| VIN (Pin 5) | Main input supply | 3.5V–20V input rail; powers internal bias circuitry and references |
| CT (Pin 6) | Timing capacitor connection | External capacitor sets off-time and operating frequency; discharge current scales with VOUT |
| ITH (Pin 7) | Gain amplifier decoupling | Connects to RC network; adjusts current comparator threshold dynamically with load |
| SENSE– (Pin 8) | Current sense negative / internal feedback tap | In LTC1266CS-3.3#TRPBF, connects to internal 3.3V divider; also serves as (–) input to current comparator |
| SENSE+ (Pin 9) | Current sense positive | (+) input to current comparator; offset vs SENSE– sets current trip threshold (135–175mV typical) |
| VFB (Pin 10) | Feedback input (NC in fixed versions) | No-connect in LTC1266CS-3.3#TRPBF; used only in adjustable LTC1266 variants |
| SHDN (Pin 11) | Shutdown control | Ground = active; ≥0.8V = micropower shutdown (IQ < 40µA); must not float |
| SGND (Pin 12) | Small-signal ground | Separate analog ground return for feedback and sensing; routed to COUT (–) terminal |
| LBIN (Pin 13) | Low-battery comparator input | Compares external voltage to internal 1.25V reference; trip range 1.14–1.42V depending on VIN |
| LBOUT (Pin 14) | Low-battery open-drain output | Sinks up to 8mA when LBIN < reference; used to signal battery depletion to host MCU |
| PGND (Pin 15) | Power ground | Return path for CIN (–), N-channel source, and driver power circuits; separate from SGND |
| BDRIVE (Pin 16) | Bottom-side N-MOSFET driver | Drives synchronous rectifier; swing from ground to PWR VIN; nonoverlapping with TDRIVE |
Key Features
| Feature | Design Value |
|---|---|
| Automatic Burst Mode™ operation | Reduces IQ to 170µA at light loads while maintaining regulation - extends battery runtime without manual mode switching |
| Pin-selectable N- or P-channel topside drive | Enables optimal trade-off: N-channel for high-current efficiency (>3A), P-channel for low-dropout simplicity (<3A) |
| Integrated low-battery detector | Eliminates need for external supervisor IC; provides accurate, temperature-compensated 1.25V reference and open-drain flag |
| Nonoverlapping gate drive logic | Prevents shoot-through in external MOSFETs - ensures safe synchronous rectification without external timing circuitry |
| Constant off-time current-mode control | Delivers excellent line/load transient response and inherent stability without loop compensation components |
| Logic-controlled micropower shutdown | Reduces total system IQ to <40µA - critical for always-on subsystems in portable electronics |
Applications
| Notebook Power Management | GPS Receiver Supply |
|---|---|
Use Scenario: Regulating 3.3V rail for CPU I/O, memory interface, and USB PHY in ultra-thin notebooks with Li-ion battery input (7–12V). IC Role / Device Role / Timing Role: Primary synchronous buck controller managing dynamic load steps up to 5A while maintaining tight output regulation and low noise. Use Value: Achieves >95% efficiency across 10mA–5A load range and extends battery life via Burst Mode™ during idle/sleep states. | Use Scenario: Providing clean, stable 3.3V supply to GPS baseband processor and RF front-end in handheld navigation units. IC Role / Device Role / Timing Role: High-efficiency DC/DC controller with integrated low-battery detection to trigger graceful shutdown before GPS lock loss. Use Value: Eliminates external supervisor and reduces BOM count; LBOUT pin directly interfaces with GPS SoC's reset/interrupt input. |
| Portable Medical Instrument | Cellular Baseband Module |
Use Scenario: Powering precision ADCs, op-amps, and microcontroller in battery-operated blood glucose meters or pulse oximeters. IC Role / Device Role / Timing Role: Fixed-output buck controller delivering low-noise, low-ripple 3.3V with minimal quiescent power draw during sensor sampling intervals. Use Value: 170µA Burst Mode™ current enables multi-week operation on coin-cell batteries; tight 3.3V tolerance ensures ADC reference stability. | Use Scenario: Generating core 3.3V supply for LTE/WCDMA baseband processors in smartphones and feature phones with variable input (3.4–4.2V Li-ion). IC Role / Device Role / Timing Role: Synchronous controller supporting P-channel topology for lowest dropout during battery sag, with fast transient response to bursty processing loads. Use Value: P-channel mode enables 100% duty cycle operation down to VIN = VOUT + RDS(ON) × ILOAD - preserves functionality even at end-of-discharge. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8610ACDE#TRPBF | Monolithic 3.3V buck (integrated MOSFETs); higher IQ (2.5µA) but no external FET flexibility; 42V max VIN | Replaces discrete-FET designs with simpler layout; unsuitable where thermal/power handling requires external MOSFETs | Select LT8610ACDE#TRPBF only if board space and design simplicity outweigh need for custom MOSFET selection and high-current scalability. |
| TPS54332DDAR | Adjustable-output buck controller (not fixed 3.3V); requires external feedback resistors; 28V max VIN; no Burst Mode™ | Lacks automatic light-load efficiency optimization; requires external low-battery monitoring circuitry | Choose TPS54332DDAR when output voltage must be reconfigured post-design or when cost sensitivity favors TI's broad distribution network over Analog Devices' performance envelope. |
Compared with LT8610ACDE#TRPBF and TPS54332DDAR, the LTC1266CS-3.3#TRPBF uniquely combines fixed 3.3V output, external MOSFET flexibility, Burst Mode™ efficiency, and integrated low-battery detection - making it optimal for portable systems requiring long battery life, precise voltage regulation, and intelligent power management without monolithic integration compromises.
Availability
LTC1266CS-3.3#TRPBF is available at Aetrix Electronics and suitable for notebook computers, GPS receivers, portable medical instruments, and cellular baseband modules requiring stable component supply, long-term lifecycle support, and guaranteed commercial-grade performance.
Supply support for LTC1266CS-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, Inc. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, acquired Linear Technology in 2017 to expand its power management portfolio.
The LTC1266 series was developed by Linear Technology specifically for high-efficiency, low-quiescent-current synchronous buck control in portable and battery-critical applications - emphasizing Burst Mode™ operation, flexible MOSFET drive, and integrated system supervision functions.
FAQ
What is the maximum input voltage rating for the LTC1266CS-3.3#TRPBF?
The LTC1266CS-3.3#TRPBF has an absolute maximum input voltage rating of 20V on the VIN pin (Pin 5). Operation is specified from 3.5V to 18V, with reliable performance up to 20V under transient conditions. Exceeding 20V risks permanent damage to internal ESD structures and gate oxide layers. Always observe derating guidelines per the datasheet's Absolute Maximum Ratings table.
Does the LTC1266CS-3.3#TRPBF require external feedback resistors to set its output voltage?
No. The LTC1266CS-3.3#TRPBF is a fixed-output variant with internal resistive feedback connected to the SENSE– pin (Pin 8), establishing a nominal 3.3V output. Unlike the adjustable LTC1266, it does not use the VFB pin (Pin 10), which remains no-connect. This eliminates resistor tolerance errors and simplifies layout for dedicated 3.3V rail generation.
How does the Burst Mode™ operation improve efficiency at light loads in the LTC1266CS-3.3#TRPBF?
Burst Mode™ operation in the LTC1266CS-3.3#TRPBF reduces switching activity during light loads, lowering quiescent current to 170µA and cutting standby power to ~1mW at VIN = 5V. Instead of continuous PWM, the controller enters sleep cycles where both MOSFETs are off and output is sustained by COUT. Regulation is maintained by periodic short bursts - preserving efficiency without sacrificing output accuracy.
Can the LTC1266CS-3.3#TRPBF drive an N-channel MOSFET as the high-side switch?
Yes. The LTC1266CS-3.3#TRPBF supports both N-channel and P-channel high-side MOSFETs. To configure for N-channel, apply logic-high (PWR VIN) to PINV (Pin 3). This enables bootstrapped gate drive and imposes a 60µs maximum on-time limit for safe startup. N-channel use is recommended for high-current applications (>3A) due to lower RDS(ON) and higher efficiency.
What is the function of the LBIN and LBOUT pins on the LTC1266CS-3.3#TRPBF?
The LBIN (Pin 13) and LBOUT (Pin 14) pins implement an integrated low-battery detector. LBIN compares an external voltage (e.g., battery sense node) to an internal 1.25V reference; when LBIN falls below the trip point (1.14–1.42V, dependent on VIN), LBOUT (open-drain) pulls low to signal battery depletion. This eliminates need for external supervisors in portable systems using the LTC1266CS-3.3#TRPBF.
LTC1266CS-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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SO
LTC1266CS-3.3#TRPBF FAQ
1.How can I place an order for LTC1266CS-3.3#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1266CS-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 LTC1266CS-3.3#TRPBF reliable?
The price and inventory of LTC1266CS-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 LTC1266CS-3.3#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1266CS-3.3#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1266CS-3.3#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1266CS-3.3#TRPBF?
LTC1266CS-3.3#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1266CS-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 LTC1266CS-3.3#TRPBF?
For technical support, including LTC1266CS-3.3#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1266CS-3.3#TRPBF requirements.
6.How does Aetrix verify that LTC1266CS-3.3#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1266CS-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 LTC1266CS-3.3#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1266CS-3.3#TRPBF?
All LTC1266CS-3.3#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1266CS-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 LTC1266CS-3.3#TRPBF part is unused and in its original packaging.
Return procedure for LTC1266CS-3.3#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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