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Analog Devices Inc. LTC1266IS#PBF
- Part No.:
- LTC1266IS#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1266IS#PBF.pdf
- Description:
- IC REG CTRLR BUCK 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:299
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Product details
Overview
LTC1266IS#PBF from Analog Devices (formerly Linear Technology) is a synchronous step-down switching regulator controller for external N- or P-channel MOSFETs, supporting 3.5V–20V input and delivering tightly regulated 3.3V or 5V outputs with ±1% accuracy, 95%+ efficiency, and 170µA light-load standby current - deployed in portable instrumentation and GPS systems requiring high-efficiency DC/DC conversion.
For engineers reviewing the LTC1266IS#PBF datasheet, LTC1266IS#PBF pinout, LTC1266IS#PBF application, or LTC1266IS#PBF equivalent, this page delivers verified functional identity, confirmed 16-pin SOIC package mapping, validated burst-mode and phase-select operation, exact current-sense thresholds (135–190mV), and two rigorously cross-checked alternative controllers for low-dropout or high-current synchronous buck designs.
Technical Context
The LTC1266IS#PBF implements a constant off-time current-mode architecture with user-selectable burst mode (via BINH pin) and phase inversion (via PINV pin) to drive either N-channel (for high-current) or P-channel (for low-dropout) topside MOSFETs. Its timing capacitor (CT) sets frequency up to 400kHz, while internal gain block and voltage comparator jointly manage regulation across load ranges.
It integrates a low-battery detector (1.14–1.42V trip), logic-controlled micropower shutdown (<40µA), nonoverlapping gate drives, and short-circuit protection with extended off-time. The device maintains <65mV load regulation (3.3V version) and <40mV line regulation over 7–12V input, with feedback reference at 1.265V and sense threshold programmable via RSENSE.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5V to 20V - supports wide-input industrial and battery-powered systems without external pre-regulation. |
| Output Accuracy | ±1% (LTC1266A-grade) - ensures stable 3.3V/5V rail tolerance for sensitive analog and digital loads. |
| Standby Current | 170µA - enables >1000-hour battery life in always-on portable instruments at light load. |
| Burst Mode Threshold | 135–190mV sense voltage - defines precise transition point between continuous and burst operation for optimal efficiency trade-off. |
| Off-Time | 3.8–7.0µs - determines minimum switch-off duration and directly governs operating frequency and ripple control. |
| Low-Battery Trip | 1.14–1.42V (VIN-dependent) - provides accurate undervoltage warning for Li-ion or multi-cell battery monitoring. |
| Shutdown Current | 25–60µA - guarantees ultra-low power state during system sleep or fault recovery. |
Pinout & Package
Package: 16-lead narrow SOIC (SO-16), 1.27mm pitch, JEDEC MS-012AC compliant, rated for –40°C to +85°C industrial temperature range.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| TDRIVE (Pin 1) | Topside MOSFET gate driver output | Drives P-channel (0V–PWR VIN) or N-channel (ground–PWR VIN); supports bootstrap or direct-drive configurations. |
| PWR VIN (Pin 2) | Driver power supply | Independent 3.5–18V supply for gate drivers; must be decoupled locally to PGND to minimize shoot-through risk. |
| PINV (Pin 3) | Phase invert control | Logic-selectable: 0V = P-channel mode (no on-time limit), PWR VIN = N-channel mode (60µs max on-time). |
| BINH (Pin 4) | Burst mode inhibit | CMOS-high disables burst mode; forces continuous operation down to zero load for noise-sensitive applications. |
| VIN (Pin 5) | Main input supply | Primary 3.5–20V input; powers internal circuitry and feeds CT timing network. |
| CT (Pin 6) | Timing capacitor connection | External capacitor sets off-time and operating frequency; discharge current proportional to VOUT for ripple modeling. |
| ITH (Pin 7) | Gain amplifier decoupling | Controls current comparator threshold; voltage increase raises current trip point to track load changes. |
| SENSE– (Pin 8) | Current comparator (–) input / fixed-VOUT divider tap | In LTC1266IS-3.3/5, connects to internal resistor divider; also serves as current-sense reference node. |
| SENSE+ (Pin 9) | Current comparator (+) input | Paired with SENSE– to measure shunt voltage; built-in offset enables precise 25–190mV threshold selection. |
| VFB (Pin 10) | Feedback input (NC for fixed versions) | No-connect on LTC1266IS-3.3/5; used only on adjustable LTC1266 variants for external resistor-divider output programming. |
| SHDN (Pin 11) | Shutdown enable | Ground = active; >0.8V = micropower shutdown (<60µA); requires fast-edge CMOS signal (tr/tf < 1µs). |
| SGND (Pin 12) | Small-signal ground | Separate analog ground return for feedback and sense paths; must route independently from PGND to avoid noise coupling. |
| LBIN (Pin 13) | Low-battery comparator input | Compares against internal 1.25V reference; trip point varies with VIN (1.14–1.42V) for accurate battery monitoring. |
| LBOUT (Pin 14) | Low-battery open-drain output | Sinks up to 8mA when LBIN < reference; interfaces directly to microcontroller GPIO or supervisor IC. |
| PGND (Pin 15) | Power ground | Return path for TDRIVE, BDRIVE, CIN; connects to source of N-MOSFET and (–) terminal of input capacitor. |
| BDRIVE (Pin 16) | Bottom-side N-MOSFET gate driver | High-current output swinging 0V to PWR VIN; synchronized with TDRIVE to prevent shoot-through. |
Key Features
| Feature | Design Value |
|---|---|
| Pin-selectable topology support | Single pin (PINV) configures driver phase and on-time limit - eliminates board redesign when switching between P- and N-channel topologies. |
| Automatic Burst Mode™ operation | Reduces quiescent current from 2.1mA to 170µA at light loads while maintaining regulation - extends battery runtime without manual mode control. |
| Synchronous nonoverlapping gate drives | Dedicated TDRIVE/BDRIVE outputs with built-in dead-time control - prevents shoot-through and eliminates need for external gate-delay circuits. |
| Integrated low-battery detection | On-chip comparator with VIN-compensated trip point (1.14–1.42V) and open-drain LBOUT - removes external supervisor IC in portable systems. |
| Constant off-time current-mode control | CT-based timing with VOUT-proportional discharge current - ensures stable ripple current and predictable frequency across input/output variations. |
Applications
| Portable Instrumentation Power | GPS Receiver DC/DC Conversion |
|---|---|
Use Scenario: Battery-powered handheld multimeters and data loggers requiring stable 3.3V rail under varying load (10mA–2A) and wide input (4–16V). IC Role / Device Role / Timing Role: Primary synchronous buck controller managing external Si9410 N-MOSFET pair; regulates output using internal 1.265V reference and current-mode loop. Use Value: 95% peak efficiency and 170µA standby current enable >500-hour operation on two AA cells; burst mode eliminates audible coil whine during measurement idle periods. | Use Scenario: Compact GPS modules powered by single-cell Li-ion (3.0–4.2V) needing clean, low-noise 3.3V supply for RF front-end and baseband processor. IC Role / Device Role / Timing Role: Step-down controller in P-channel configuration (PINV = 0V) for lowest dropout; uses internal low-battery detector to trigger graceful shutdown below 3.2V. Use Value: Sub-100mV dropout at 500mA (RDS(ON)-limited) and <65mV load regulation ensure GNSS signal integrity; LBOUT pin directly signals host MCU for battery-aware firmware behavior. |
| Notebook System Rail Generation | DC Power Distribution Node |
Use Scenario: Auxiliary 5V rail generation in ultraportable notebooks where space and thermal budget constrain discrete solutions. IC Role / Device Role / Timing Role: Fixed-output 5V controller (LTC1266IS-5 variant) driving dual N-MOSFETs; configured for burst mode to reduce idle power in suspend states. Use Value: 16-pin SOIC footprint saves PCB area vs integrated DC/DC modules; 1% output accuracy meets USB peripheral voltage compliance without post-regulation LDO. | Use Scenario: Centralized 12V-to-5V conversion node in industrial IoT gateway supplying multiple sensor subsystems with dynamic load profiles. IC Role / Device Role / Timing Role: High-efficiency synchronous controller enabling remote monitoring of load current via RSENSE voltage; SHDN pin allows centralized power sequencing. Use Value: Programmable current limit (via RSENSE) and short-circuit protection with extended off-time prevent bus faults from cascading; PGND/SGND separation ensures noise immunity in mixed-signal environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3850EFE#PBF | Higher 500kHz max frequency, integrated 5V bias LDO, no built-in low-battery detector | Requires external UVLO; better suited for high-density, high-frequency designs where board space is critical | Select when needing higher switching frequency (>300kHz) and integrated gate-driver bias supply - not drop-in due to different pinout and missing LBOUT/LBIN. |
| LM5116MH/NOPB | Wider 6–100V input range, valley-current mode, no burst mode, 1.5% FB accuracy | Designed for high-voltage industrial supplies; lacks automatic light-load efficiency optimization | Choose for 24V/48V DC distribution where input exceeds 20V - not suitable for battery-powered burst-mode applications. |
Compared with LTC1266IS#PBF, LTC3850EFE#PBF offers higher frequency and integrated bias but sacrifices low-battery monitoring; LM5116MH/NOPB supports much higher input voltage but lacks burst mode and precision low-load efficiency - making LTC1266IS#PBF uniquely suited for compact, battery-aware 3.3V/5V systems demanding sub-200µA standby.
Availability
LTC1266IS#PBF is available at Aetrix Electronics and suitable for portable instrumentation, GPS receivers, notebook auxiliary rails, and DC power distribution nodes requiring stable component supply with guaranteed –40°C to +85°C operation and long-term lifecycle support.
Supply support for LTC1266IS#PBF 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 technical and manufacturing continuity for all Linear product lines, including precision power management ICs.
The LTC1266 series was designed specifically for high-efficiency, low-quiescent-current synchronous buck conversion in space-constrained portable electronics - emphasizing burst-mode operation, topology flexibility, and integrated system monitoring functions.
FAQ
What is the operating temperature range certified for LTC1266IS#PBF?
The LTC1266IS#PBF is fully tested and guaranteed over the industrial temperature range of –40°C to +85°C, unlike the C-grade LTC1266CS variants which are only correlation-tested at those extremes. This makes LTC1266IS#PBF suitable for automotive cabin electronics, outdoor instrumentation, and industrial control panels where ambient temperatures exceed commercial limits.
Can LTC1266IS#PBF drive both N-channel and P-channel topside MOSFETs in the same design?
Yes - LTC1266IS#PBF supports both topologies via the PINV pin: grounding PINV selects P-channel mode (enabling 100% duty cycle for ultra-low dropout), while tying PINV to PWR VIN selects N-channel mode (with 60µs max on-time for safe bootstrap start-up). The driver outputs (TDRIVE/BDRIVE) auto-adjust voltage swing accordingly, requiring no hardware change.
How does burst mode operation affect output voltage ripple on LTC1266IS#PBF?
In burst mode, LTC1266IS#PBF reduces switching frequency and enters sleep cycles, resulting in higher peak-to-peak output ripple (up to 50mVP-P at 150mA load) compared to continuous mode. However, the device maintains regulation within ±1% accuracy, and ripple remains bounded by output capacitor ESR and capacitance - typical designs use ≥330µF low-ESR output caps to meet noise requirements.
What is the function of the LBIN and LBOUT pins on LTC1266IS#PBF?
LBIN (Pin 13) is the input to an internal comparator referenced to 1.25V; it monitors system input voltage and triggers when VIN drops below a VIN-dependent threshold (1.14–1.42V). LBOUT (Pin 14) is an open-drain output that sinks current when LBIN trips - enabling direct interface to microcontroller interrupt pins or external supervisors without pull-up resistors.
Is LTC1266IS#PBF pin-compatible with other members of the LTC1266 family?
Yes - all LTC1266 variants (including LTC1266IS#PBF, LTC1266IS-3.3#PBF, and LTC1266AIS#PBF) share identical 16-pin SOIC pinouts and electrical compatibility. Differences are limited to internal feedback dividers (fixed 3.3V/5V vs adjustable), reference accuracy (1.265V ±0.8% vs ±0.5%), and temperature grade - allowing one PCB layout to support multiple output voltages and performance grades.
LTC1266IS#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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#PBF FAQ
1.How can I place an order for LTC1266IS#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1266IS#PBF 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#PBF reliable?
The price and inventory of LTC1266IS#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1266IS#PBF is usually 5 days.
3.What payment methods are accepted for LTC1266IS#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1266IS#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1266IS#PBF?
LTC1266IS#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1266IS#PBF 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#PBF?
For technical support, including LTC1266IS#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1266IS#PBF requirements.
6.How does Aetrix verify that LTC1266IS#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1266IS#PBF 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#PBF meets industry standards.
7.What is the process for return or replacement of LTC1266IS#PBF?
All LTC1266IS#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1266IS#PBF, 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#PBF part is unused and in its original packaging.
Return procedure for LTC1266IS#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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