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Analog Devices Inc. LTC1266ACS#TRPBF
- Part No.:
- LTC1266ACS#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1266ACS#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,620
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Product details
Overview
LTC1266ACS#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 features constant off-time current mode control, pin-selectable Burst Mode™ operation, 1% output voltage accuracy (A-grade), wide 3.5V–20V input range, and integrated low-battery detection - enabling ultra-high efficiency (>95%) in portable power systems such as notebook computers and GPS receivers.
For engineers reviewing the LTC1266ACS#TRPBF datasheet, LTC1266ACS#TRPBF pinout, LTC1266ACS#TRPBF application, or LTC1266ACS#TRPBF equivalent, key selection criteria include its dual-MOSFET gate drive capability (TDRIVE/BDRIVE), programmable current sense threshold (135–175 mV), 16-pin SOIC package compatibility, and support for both buck and low-dropout P-channel configurations with no external compensation required.
Technical Context
The LTC1266ACS#TRPBF implements a constant off-time (COT) current mode architecture that sets switching frequency via an external CT capacitor and maintains regulated output by comparing sensed inductor current (via SENSE+/SENSE−) against a programmable threshold. Its dual-mode operation-continuous conduction at medium-to-heavy loads and automatic Burst Mode™ at light loads-enables stable regulation while minimizing quiescent current (170 µA sleep, <40 µA shutdown).
Pin-selectable topology configuration (PINV = 0V for P-channel, PINV = PWR VIN for N-channel) determines driver phase and enables dropout optimization: P-channel mode supports 100% duty cycle in dropout, while N-channel mode enforces 60 µs max on-time for safe bootstrap startup. Non-overlapping gate drives prevent shoot-through, and built-in short-circuit protection extends tOFF to limit peak current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Feedback Voltage (VFB) | 1.252 V to 1.278 V - sets precise output regulation point for adjustable versions; used with external resistor divider. |
| Output Accuracy | ±1% over temperature - guaranteed for LTC1266ACS grade, enabling tight tolerance power rails without post-regulation. |
| Input Voltage Range | 3.5 V to 20 V - supports wide industrial and battery-powered inputs including 5 V, 9 V, 12 V, and 19 V nominal sources. |
| Current Sense Threshold | 135 mV to 175 mV (Burst Mode enabled) - defines peak inductor current limit; directly sets maximum output current via RSENSE. |
| Quiescent Current | 170 µA in Burst Mode sleep - reduces standby power to ~1 mW at 5 V input, critical for battery life in always-on systems. |
| Switching Frequency | Up to 400 kHz - set by CT capacitor (e.g., 390 pF yields ~5 µs tOFF); higher frequencies allow smaller magnetics but increase gate losses. |
| Low-Battery Detection | 1.14 V to 1.35 V trip threshold - internal comparator with open-drain LBOUT output enables system-level brownout warning or shutdown. |
Pinout & Package
Package: 16-lead narrow SOIC (SO-16), surface-mount, RoHS-compliant, JEDEC MS-012AC standard footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| TDRIVE (Pin 1) | Topside MOSFET gate driver output | High-current drive (PWR VIN to GND); supports N-channel (ON = PWR VIN) or P-channel (ON = GND) based on PINV state. |
| PWR VIN (Pin 2) | Driver power supply | Separate 3.5–20 V supply for gate drivers; must be locally decoupled to PGND to minimize noise coupling into sensitive analog sections. |
| PINV (Pin 3) | Phase invert select | Configures TDRIVE polarity: 0 V → P-channel mode (100% duty cycle possible); PWR VIN → N-channel mode (60 µs max on-time enforced). |
| BINH (Pin 4) | Burst Mode inhibit | CMOS logic high disables automatic Burst Mode, forcing continuous operation down to zero load - useful for noise-sensitive applications. |
| VIN (Pin 5) | Main supply input | Primary input rail (3.5–20 V); powers internal bias circuitry and feeds CT timing network; separate from PWR VIN. |
| CT (Pin 6) | Timing capacitor connection | External capacitor (e.g., 390 pF) sets off-time and thus operating frequency; discharge current scales with VOUT for inherent line regulation. |
| ITH (Pin 7) | Gain amplifier decoupling | Decoupling point for internal gain stage; voltage here modulates current comparator threshold to track load changes. |
| SENSE− (Pin 8) | Current sense (−) / fixed-VOUT reference | In fixed-output versions (e.g., LTC1266ACS), connects to internal resistive divider setting VOUT; also (−) input of current comparator. |
| SENSE+ (Pin 9) | Current sense (+) | (+) input of current comparator; offset vs. SENSE− defines trip threshold (e.g., 155 mV typical) across RSENSE. |
| VFB (Pin 10) | Feedback input (NC in fixed versions) | Not connected in LTC1266ACS#TRPBF (fixed 3.3 V version); used only in adjustable LTC1266 variants with external resistor divider. |
| SHDN (Pin 11) | Shutdown control | Logic-low = normal operation; ≥0.8 V = micropower shutdown (IQ < 40 µA); must not float - requires pull-down or active drive. |
| SGND (Pin 12) | Small-signal ground | Separate analog ground return for feedback and sense paths; must be routed independently from PGND to avoid noise injection. |
| LBIN (Pin 13) | Low-battery comparator input | Compares external voltage (e.g., battery tap) against internal 1.25 V reference; triggers LBOUT when below trip threshold. |
| LBOUT (Pin 14) | Low-battery open-drain output | Sinks current when LBIN < 1.25 V; can drive LED, microcontroller interrupt, or enable/disable downstream circuitry. |
| PGND (Pin 15) | Power ground | Return path for TDRIVE, BDRIVE, and CIN; connects to source of N-channel topside MOSFET and (−) terminal of input capacitor. |
| BDRIVE (Pin 16) | Bottom-side MOSFET gate driver | High-current drive (GND to PWR VIN); always drives N-channel synchronous rectifier; non-overlapping control prevents shoot-through. |
Key Features
| Feature | Design Value |
|---|---|
| Automatic Burst Mode™ operation | Maintains >90% efficiency down to 1 mA load by disabling switching and entering micropower sleep (170 µA IQ), eliminating light-load inefficiency cliffs. |
| Pin-selectable MOSFET topology | Single-pin (PINV) configures for either P-channel (low-dropout, 100% duty cycle) or N-channel (lower RDS(ON), higher efficiency at high current) topside switch. |
| Integrated low-battery detector | Dedicated comparator with 1.25 V reference and open-drain LBOUT output enables autonomous battery monitoring without external components. |
| Non-overlapping gate drive logic | Hardware-enforced dead time between TDRIVE and BDRIVE prevents simultaneous conduction and shoot-through current in external MOSFETs. |
| Constant off-time current mode control | Eliminates need for loop compensation; provides inherent line/load transient response and stable operation across wide input/output ranges. |
Applications
| Notebook Power Management | Portable Instrument DC/DC Conversion |
|---|---|
|
Use Scenario: Regulating 3.3 V rail from 5 V or 12 V battery input in ultraportable notebooks with strict thermal and battery-life constraints. IC Role / Device Role / Timing Role: Primary synchronous buck controller managing high-current (up to 5 A) conversion with adaptive Burst Mode™ to extend runtime during idle/sleep states. Use Value: Achieves >95% peak efficiency and 170 µA quiescent current, directly increasing usable battery capacity by up to 30% versus traditional PWM controllers. |
Use Scenario: Generating stable 3.3 V supply for precision ADCs, sensors, and microcontrollers in handheld test equipment powered by Li-ion batteries. IC Role / Device Role / Timing Role: High-accuracy (±1%) voltage controller with integrated low-battery warning (LBIN/LBOUT) to trigger graceful shutdown before system brownout. Use Value: Eliminates need for external supervisor IC and discrete current-sense resistor, reducing BOM count by 4 components and PCB area by >12 mm². |
| GPS Receiver Power Supply | DC Power Distribution System |
|
Use Scenario: Providing clean, low-noise 3.3 V supply to RF front-end and baseband processor in automotive or asset-tracking GPS modules. IC Role / Device Role / Timing Role: Synchronous controller driving low-RDS(ON) N-channel MOSFETs with programmable Burst Mode™ to suppress switching noise during signal acquisition. Use Value: Reduces conducted EMI by disabling switching during sensitive RF periods, improving C/N0 ratio by up to 2 dB without adding filters. |
Use Scenario: Centralized 3.3 V distribution in industrial IoT gateways where multiple subsystems require tightly regulated, fault-tolerant power. IC Role / Device Role / Timing Role: Robust controller with short-circuit protection (extended tOFF), logic-controlled shutdown (SHDN), and wide 3.5–20 V input handling unregulated 12 V or 24 V rails. Use Value: Enables single-controller solution across diverse input sources while maintaining ±1% output accuracy and 12 mA LBOUT sink capability for status signaling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8610EMSE#TRPBF | Monolithic 3.5 A buck regulator (integrated MOSFETs); 2.8–30 V input; 35 ns min on-time; no Burst Mode, uses Silent Switcher® architecture. | Replaces discrete MOSFET design with integrated solution; eliminates external FET layout complexity but limits max current and thermal flexibility. | Select LT8610EMSE#TRPBF when board space and EMI are critical, and 3.5 A output suffices; LTC1266ACS#TRPBF remains preferred for >5 A, custom thermal management, or P-channel dropout use cases. |
| TPS54331DR | 3 A integrated buck converter; 3.5–28 V input; current mode control; Eco-mode™ (similar to Burst Mode); SOIC-8 package. | Lower current rating and smaller package; lacks low-battery detection, P-channel support, and independent PWR VIN rail. | Choose TPS54331DR for cost-sensitive, space-constrained designs under 3 A where LBOUT/PINV functionality is unnecessary; LTC1266ACS#TRPBF offers superior feature set for demanding portable power. |
Compared with LT8610EMSE#TRPBF and TPS54331DR, the LTC1266ACS#TRPBF uniquely combines external MOSFET flexibility, P-channel dropout capability, integrated low-battery monitoring, and 1% output accuracy in a 16-pin SOIC - making it the optimal choice for high-reliability, multi-rail portable systems requiring design scalability and long-term component availability.
Availability
LTC1266ACS#TRPBF is available at Aetrix Electronics and suitable for notebook computers, portable instrumentation, and GPS systems requiring stable component supply, extended temperature support (0°C to 70°C), and long-lifecycle availability in tape-and-reel packaging.
Supply support for LTC1266ACS#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. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC1266 series was developed by Linear Technology specifically for high-efficiency, externally switched DC/DC controllers targeting battery-powered portable electronics - emphasizing ultra-low quiescent current, topology flexibility, and integrated system monitoring functions.
FAQ
What is the output voltage of the LTC1266ACS#TRPBF?
The LTC1266ACS#TRPBF is a fixed 3.3 V output version of the LTC1266 synchronous controller family. Its internal resistive divider sets VOUT to 3.3 V with ±1% accuracy over temperature and line/load conditions, eliminating the need for external feedback resistors. This is confirmed in the Electrical Characteristics table where LTC1266ACS shows VOUT = 3.23 V to 3.43 V at 700 mA load.
Does the LTC1266ACS#TRPBF support both N-channel and P-channel topside MOSFETs?
Yes, the LTC1266ACS#TRPBF supports both topologies via the PINV pin (Pin 3): grounding PINV configures TDRIVE for P-channel operation (0 V turn-on), while tying PINV to PWR VIN selects N-channel mode (PWR VIN turn-on). This dual-mode capability is explicitly documented in the Pin Functions section and enables either low-dropout (P-channel) or high-efficiency (N-channel) design choices.
What is the purpose of the BINH pin on the LTC1266ACS#TRPBF?
The BINH (Burst Mode Inhibit) pin (Pin 4) disables automatic Burst Mode™ operation when driven to a CMOS logic high (≥0.8 V). This forces continuous switching down to zero load, which improves output voltage ripple and EMI predictability in noise-sensitive applications - a key differentiator versus basic PWM controllers. The LTC1266ACS#TRPBF datasheet specifies BINH threshold as 0.8 V to 2.0 V.
How does the LTC1266ACS#TRPBF achieve high efficiency at light loads?
The LTC1266ACS#TRPBF achieves >90% efficiency at light loads via automatic Burst Mode™ operation: it discontinues switching, enters micropower sleep (170 µA IQ), and sustains output voltage from COUT until regulated level drops by hysteresis, then resumes a single switching cycle. This behavior is intrinsic to the LTC1266ACS#TRPBF's constant off-time architecture and is validated in Figure G03/G04 efficiency curves showing flat high-efficiency regions down to 10 mA.
What package type is used for the LTC1266ACS#TRPBF?
The LTC1266ACS#TRPBF is supplied in a 16-lead narrow SOIC (SO-16) package per JEDEC MS-012AC, with 1.27 mm lead pitch and RoHS-compliant finish. This is explicitly stated in the "PACKAGE/ORDER INFORMATION" section and confirmed in the top-view pin diagram labeled "S PACKAGE 16-LEAD PLASTIC SO".
LTC1266ACS#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
LTC1266ACS#TRPBF FAQ
1.How can I place an order for LTC1266ACS#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1266ACS#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 LTC1266ACS#TRPBF reliable?
The price and inventory of LTC1266ACS#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1266ACS#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1266ACS#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1266ACS#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1266ACS#TRPBF?
LTC1266ACS#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1266ACS#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 LTC1266ACS#TRPBF?
For technical support, including LTC1266ACS#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1266ACS#TRPBF requirements.
6.How does Aetrix verify that LTC1266ACS#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1266ACS#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 LTC1266ACS#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1266ACS#TRPBF?
All LTC1266ACS#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1266ACS#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 LTC1266ACS#TRPBF part is unused and in its original packaging.
Return procedure for LTC1266ACS#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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