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Analog Devices Inc. LTC1266CS#PBF
- Part No.:
- LTC1266CS#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1266CS#PBF.pdf
- Description:
- IC REG CTRLR BUCK 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,622
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Product details
Overview
LTC1266CS#PBF 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 (LTC1266A variant), and supports input voltages from 3.5V to 20V. It is used in portable power systems requiring ultrahigh efficiency at light loads, such as notebook computers and GPS receivers.
For engineers reviewing the LTC1266CS#PBF datasheet, LTC1266CS#PBF pinout, LTC1266CS#PBF application, or LTC1266CS#PBF equivalent, key selection criteria include its dual-MOSFET gate drive capability (TDRIVE/BDRIVE), programmable current sense threshold (135–175 mV), low 170 µA standby current, and integrated low-battery detection with 1.14–1.35 V trip point across input range.
Technical Context
The LTC1266CS#PBF implements a constant off-time (COT) current mode architecture that sets switching frequency via 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 above ~500 mA and automatic Burst Mode below-enables >95% efficiency across wide load range while limiting light-load quiescent power to 1 mW at 5 VIN.
Pin-selectable topology support is implemented through PINV (Pin 3): grounded for P-channel topside (enabling true low-dropout operation) or pulled to PWR VIN for N-channel topside (supporting higher current). BINH (Pin 4) disables Burst Mode for forced continuous operation, and LBIN/LBOUT (Pins 13/14) provide a dedicated low-battery comparator with 1.25 V internal reference and open-drain output.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5 V to 20 V - supports wide-input industrial and battery-powered systems including 5 V, 9 V, and 12 V rails. |
| Feedback Voltage (VFB) | 1.210 V to 1.290 V - sets output voltage precision for adjustable configurations using external resistor divider. |
| Current Sense Threshold | 135–175 mV (Burst Mode enabled) - defines peak inductor current limit and maximum output current via RSENSE. |
| Standby Supply Current | 170–260 µA - enables micropower sleep mode during light loads, reducing system idle power significantly. |
| Off-Time (tOFF) | 3.8–6.5 µs (CT = 390 pF) - determines minimum switch-off duration and directly scales with output voltage for COT stability. |
| Low-Battery Trip Point | 1.14–1.42 V (VIN-dependent) - provides accurate undervoltage warning without external components. |
| Shutdown Current | 25–60 µA - ensures ultra-low power state when SHDN (Pin 11) is asserted high. |
Pinout & Package
Package: 16-pin narrow SOIC (SO-16), surface-mount, JEDEC MS-012AC compliant. Thermal resistance θJA = 110°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| TDRIVE (Pin 1) | Topside MOSFET gate driver output | Drives P-channel (0 V to PWR VIN) or N-channel (ground to PWR VIN) switch; high-current capable. |
| PWR VIN (Pin 2) | Driver power supply | Provides gate drive voltage for both TDRIVE and BDRIVE; must be decoupled locally to PGND. |
| PINV (Pin 3) | Topology select input | Ground = P-channel mode (no on-time limit); high = N-channel mode (60 µs max on-time). |
| BINH (Pin 4) | Burst Mode inhibit control | CMOS-high disables automatic burst cycling, forcing continuous operation down to zero load. |
| VIN (Pin 5) | Main input supply | Primary power input (3.5–20 V); powers internal logic and bias circuits. |
| CT (Pin 6) | Timing capacitor connection | Sets operating frequency via external capacitor; discharge current proportional to VOUT. |
| ITH (Pin 7) | Gain amplifier decoupling | Stabilizes current comparator threshold; voltage here modulates current limit vs load. |
| SENSE− (Pin 8) | Current sense negative / fixed-VOUT reference | In fixed-output versions (e.g., LTC1266CS-3.3), connects to internal divider; also (−) input of current comparator. |
| SENSE+ (Pin 9) | Current sense positive | (+) input of current comparator; offset vs SENSE− sets current trip threshold with RSENSE. |
| VFB (Pin 10) | Feedback input (adjustable version only) | Connects to external resistor divider to set output voltage; NC in fixed-output variants like LTC1266CS-3.3. |
| SHDN (Pin 11) | Shutdown enable | Logic-low = normal operation; logic-high = micropower shutdown (<60 µA IQ). |
| SGND (Pin 12) | Small-signal ground | Separate analog ground return for feedback and sensing; must be routed independently from PGND. |
| LBIN (Pin 13) | Low-battery comparator input | Compares external voltage to 1.25 V internal reference; triggers LBOUT when below trip point. |
| LBOUT (Pin 14) | Low-battery open-drain output | Sinks current when LBIN < trip voltage; drives LED or microcontroller interrupt. |
| PGND (Pin 15) | Power ground | Return path for TDRIVE, BDRIVE, and input capacitor; connects to source of N-channel MOSFET. |
| BDRIVE (Pin 16) | Bottom-side N-MOSFET gate driver | High-current output swinging from ground to PWR VIN; synchronously commutates with TDRIVE. |
Key Features
| Feature | Design Value |
|---|---|
| Automatic Burst Mode™ operation | Maintains >90% efficiency at 10 mA load by disabling switching and entering micropower sleep (170 µA IQ). |
| Pin-selectable N- or P-channel topside drive | Enables either high-current N-MOSFET (with bootstrap complexity) or low-dropout P-MOSFET (single-supply simplicity). |
| Synchronous nonoverlapping gate drives | Hardware-enforced dead time prevents shoot-through; eliminates need for external timing logic or diodes. |
| Integrated low-battery detector | Dedicated comparator with 1.25 V reference and open-drain output - no external parts required for battery monitoring. |
| Constant off-time current mode control | Provides inherent line/load transient immunity and stable operation without loop compensation components. |
Applications
| Portable Computing Power | GPS Receiver DC/DC Conversion |
|---|---|
|
Use Scenario: Regulating 3.3 V or 5 V rail from single-cell Li-ion (3.0–4.2 V) or multi-cell alkaline (4–9 V) in notebook or palmtop systems. IC Role / Device Role / Timing Role: Primary synchronous buck controller managing high-efficiency conversion with adaptive light-load behavior. Use Value: Delivers >95% peak efficiency and 170 µA standby current, extending battery runtime without compromising transient response. |
Use Scenario: Generating stable 3.3 V supply for GPS baseband ICs and RF front-end under varying battery voltage and intermittent signal acquisition loads. IC Role / Device Role / Timing Role: Constant off-time controller providing fast load-step recovery and low-noise regulation during satellite lock phases. Use Value: Burst Mode reduces average current draw during idle periods; low-battery output alerts host MCU before brownout. |
| Cellular Handset Baseband | DC Power Distribution System |
|
Use Scenario: Supplying 3.3 V to baseband processor and memory in GSM/UMTS handsets where thermal and size constraints demand high efficiency. IC Role / Device Role / Timing Role: Dual-MOSFET synchronous controller enabling compact layout with minimal external components. Use Value: Supports P-channel configuration for dropout operation down to VIN − VOUT ≈ RDS(ON) × ILOAD, critical for end-of-life battery operation. |
Use Scenario: Centralized 5 V or 3.3 V distribution node in instrumentation or industrial control modules with multiple downstream loads. IC Role / Device Role / Timing Role: High-current synchronous controller driving discrete MOSFETs for scalable, thermally robust power delivery. Use Value: Programmable current sense and adjustable tOFF allow optimization for different inductor values and load profiles across product variants. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3502AEDD#PBF | Fixed 3.3 V output, integrated power switches (no external MOSFETs), 3 MHz switching, smaller 10-lead DFN package. | Lower component count but limited to ≤500 mA; not suitable for high-current or adjustable-VOUT designs. | Select LT3502AEDD#PBF only when output current ≤500 mA and board space is constrained; LTC1266CS#PBF retains flexibility for >5 A designs with discrete FETs. |
| TPS54202DDCR | Integrated 2-A MOSFETs, adaptive on-time COT control, 4.5–17 V input, 0.8–6 V adjustable output, 2.5 V UVLO. | Lacks dedicated low-battery comparator and P-channel topology support; lower max input voltage (17 V vs 20 V). | Choose TPS54202DDCR for cost-sensitive, medium-current applications needing integration; LTC1266CS#PBF preferred where >2 A, low-battery signaling, or P-MOSFET dropout is required. |
Compared with LT3502AEDD#PBF and TPS54202DDCR, LTC1266CS#PBF offers unique support for external P-channel MOSFETs enabling true dropout operation, plus a dedicated low-battery comparator - making it optimal for battery-powered systems demanding extended runtime and precise undervoltage management.
Availability
LTC1266CS#PBF is available at Aetrix Electronics and suitable for portable computing, GPS navigation, cellular handset baseband, and distributed DC power systems requiring stable component supply, long-term lifecycle support, and guaranteed parametric performance over temperature.
Supply support for LTC1266CS#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, Inc. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors.
The LTC1266CS#PBF belongs to Linear's legacy synchronous controller family, engineered specifically for high-efficiency, low-quiescent-power DC/DC conversion in battery-operated portable electronics - emphasizing light-load efficiency, topology flexibility, and system-level monitoring features.
FAQ
What is the primary function of the LTC1266CS#PBF in a power supply design?
The LTC1266CS#PBF functions as a synchronous buck controller that drives external high-side and low-side N- or P-channel MOSFETs to regulate output voltage efficiently. It uses constant off-time current mode control, supports Burst Mode™ for ultralow light-load current (170 µA), and integrates features like low-battery detection and pin-selectable topology - all critical for portable power systems. The LTC1266CS#PBF does not include power switches, allowing designers to optimize FET selection for current, thermal, and cost requirements.
Can the LTC1266CS#PBF operate with a P-channel MOSFET for the high-side switch?
Yes, the LTC1266CS#PBF supports P-channel high-side MOSFETs via the PINV pin (Pin 3): grounding PINV configures the TDRIVE output for 0 V to PWR VIN swing, enabling direct drive of P-MOSFET gates. This configuration removes bootstrapping complexity and allows true dropout operation - especially valuable in battery-powered systems nearing end-of-life. The LTC1266CS#PBF's lack of on-time limit in P-channel mode further enhances regulation under low-VIN conditions.
How does Burst Mode™ operation improve efficiency in the LTC1266CS#PBF?
Burst Mode™ in the LTC1266CS#PBF reduces switching losses at light loads by temporarily halting switching cycles and entering a micropower sleep state (IQ ≈ 170 µA). During sleep, the output capacitor supplies load current until VOUT drops below hysteresis threshold, triggering a short burst of switching to recharge the capacitor. This mechanism maintains >90% efficiency down to ~10 mA load - far exceeding standard PWM controllers - and is essential for extending battery life in portable devices powered by the LTC1266CS#PBF.
What is the role of the LBIN and LBOUT pins on the LTC1266CS#PBF?
LBIN (Pin 13) is the input to an internal comparator referenced to 1.25 V; LBOUT (Pin 14) is its open-drain output. When LBIN voltage falls below the trip point (1.14–1.42 V, depending on VIN), LBOUT sinks current to signal low battery condition. This feature enables host microcontrollers or status LEDs to respond to battery depletion without external comparators or resistive dividers - a key system-level advantage of the LTC1266CS#PBF in portable applications.
Is the LTC1266CS#PBF pin-compatible with other members of the LTC1266 family?
Yes, the LTC1266CS#PBF shares identical pinout and package (16-pin SOIC) with all variants in the LTC1266 family, including LTC1266CS-3.3, LTC1266CS-5, LTC1266IS, and LTC1266ACS. Differences lie in internal feedback network (fixed vs adjustable), temperature grade (commercial vs industrial), and output voltage accuracy (±1% for A-grade), but PCB layout and interconnect remain fully interchangeable - simplifying BOM consolidation and design reuse across product variants using the LTC1266CS#PBF footprint.
LTC1266CS#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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SO
LTC1266CS#PBF FAQ
1.How can I place an order for LTC1266CS#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1266CS#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 LTC1266CS#PBF reliable?
The price and inventory of LTC1266CS#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1266CS#PBF is usually 5 days.
3.What payment methods are accepted for LTC1266CS#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1266CS#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1266CS#PBF?
LTC1266CS#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1266CS#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 LTC1266CS#PBF?
For technical support, including LTC1266CS#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1266CS#PBF requirements.
6.How does Aetrix verify that LTC1266CS#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1266CS#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 LTC1266CS#PBF meets industry standards.
7.What is the process for return or replacement of LTC1266CS#PBF?
All LTC1266CS#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1266CS#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 LTC1266CS#PBF part is unused and in its original packaging.
Return procedure for LTC1266CS#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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