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Analog Devices Inc. LTC1266CS-5#TRPBF
- Part No.:
- LTC1266CS-5#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1266CS-5#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,308
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Product details
Overview
LTC1266CS-5#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 5V output with ±1.5% regulation accuracy, supports 3.5V–20V input, achieves >95% efficiency at full load, and maintains ultralow 170µA standby current in Burst Mode - ideal for battery-powered portable instrumentation and GPS systems.
For engineers reviewing the LTC1266CS-5#TRPBF datasheet, LTC1266CS-5#TRPBF pinout, LTC1266CS-5#TRPBF application, or LTC1266CS-5#TRPBF equivalent, key selection criteria include its constant off-time current-mode architecture, programmable burst mode inhibit, low-battery detection capability, and dual-MOSFET gate drive timing with nonoverlapping control.
Technical Context
The LTC1266CS-5#TRPBF implements a constant off-time (COT) current-mode control architecture where tOFF is set by an external CT capacitor and scaled proportionally to VOUT, enabling stable regulation across wide VIN–VOUT differentials. Its dual comparator system separates voltage regulation (via internal 1.265V reference and SENSE–/SENSE+ inputs) from current limiting (with 135–175mV threshold), ensuring precise peak-current sensing independent of load.
Burst Mode operation is enabled by default and automatically engages below ~500mA load, reducing switching losses and holding quiescent power to 1mW at 5V input. Pin-selectable phase inversion (PINV) configures drive polarity for either N-channel (high-side ON = PWR VIN) or P-channel (high-side ON = 0V) top switches, while BINH disables Burst Mode for forced continuous conduction down to zero load.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.05V nominal (4.90–5.20V over temp/load), internally trimmed via SENSE–/SENSE+ divider - eliminates external feedback resistors. |
| Input Voltage Range | 3.5V to 20V - supports wide-input industrial and automotive-supply rails without pre-regulation. |
| Current Sense Threshold | 135–175mV (Burst Mode enabled) - sets peak inductor current; enables accurate IMAX scaling via RSENSE. |
| Standby Current | 170µA typical in Burst Mode - reduces no-load power loss to 1mW at 5V input, critical for battery runtime. |
| Off-Time (tOFF) | 4–6µs (CT = 390pF, ILOAD = 700mA) - determines minimum on-time and maximum switching frequency (~400kHz). |
| Low-Battery Detection | 1.14–1.35V trip threshold (VIN-dependent) - provides early warning via open-drain LBOUT pin for system-level brownout management. |
| Shutdown Current | 25–60µA - ensures deep power-down when SHDN ≥ 0.8V, supporting logic-controlled system sleep states. |
Pinout & Package
Package: 16-pin narrow SOIC (0.150" width), RoHS-compliant, moisture-sensitive level 3.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| TDRIVE (Pin 1) | High-current topside MOSFET gate driver | Drives P-channel (0V–PWR VIN) or N-channel (ground–PWR VIN); supports bootstrap or direct-drive configurations. |
| PWR VIN (Pin 2) | Dedicated gate drive supply input | Must be decoupled locally to PGND; powers all drivers independently of main VIN to ensure robust gate turn-on. |
| PINV (Pin 3) | Phase invert select | Logic-low = P-channel mode (continuous conduction in dropout); logic-high = N-channel mode (60µs max on-time limit). |
| BINH (Pin 4) | Burst Mode inhibit control | CMOS-high disables automatic burst cycling - forces continuous PWM down to zero load for low-noise applications. |
| VIN (Pin 5) | Main power input | Supplies internal bias circuitry; absolute max 20V; operates down to 3.5V for wide-input flexibility. |
| CT (Pin 6) | Timing capacitor connection | Sets off-time and operating frequency; discharge current proportional to VOUT enables input-voltage-independent regulation. |
| ITH (Pin 7) | Gain amplifier decoupling | Stabilizes current comparator threshold; voltage here modulates current trip point to track load changes. |
| SENSE– (Pin 8) | Fixed-output voltage sense / current comparator (–) | Internally connected to VOUT divider for 5V regulation; also serves as negative input for current sensing across RSENSE. |
| SENSE+ (Pin 9) | Current comparator (+) input | Paired with SENSE– to measure voltage across external RSENSE; built-in offset enables precise 135–175mV threshold setting. |
| VFB (Pin 10) | Feedback input (NC for fixed versions) | No-connect on LTC1266CS-5#TRPBF; reserved for adjustable variants using external resistor divider. |
| SHDN (Pin 11) | Enable/shutdown control | Ground = active; ≥0.8V = micropower shutdown (IQ < 60µA); requires fast-edge CMOS signal (tr/tf < 1µs). |
| SGND (Pin 12) | Small-signal ground reference | Must be routed separately from PGND and connected to COUT (–) to prevent noise coupling into feedback path. |
| LBIN (Pin 13) | Low-battery comparator input | Compares against internal 1.25V reference; used to monitor system supply voltage for brownout detection. |
| LBOUT (Pin 14) | Low-battery open-drain output | Sinks up to 8mA when LBIN < 1.25V; interfaces directly with microcontroller GPIO or supervisor ICs. |
| PGND (Pin 15) | Power ground return | Connects to source of N-channel MOSFET and (–) terminal of CIN; must be low-inductance path to minimize switching noise. |
| BDRIVE (Pin 16) | Bottom-side N-channel MOSFET driver | Swings 0V to PWR VIN; complements TDRIVE to enable synchronous rectification and eliminate body-diode conduction loss. |
Key Features
| Feature | Design Value |
|---|---|
| Automatic Burst Mode operation | Maintains >90% efficiency down to 10mA load by gating switching cycles - extends battery life without external control logic. |
| Synchronous N-channel bottom switch drive | Eliminates Schottky diode loss; BDRIVE delivers full PWR VIN swing to reduce conduction loss and improve thermal performance. |
| Pin-selectable P/N-channel high-side configuration | Enables optimal topology choice: P-channel for simplicity/low-dropout, N-channel for high-current/high-efficiency designs. |
| Integrated low-battery detector | Provides system-level power monitoring via dedicated LBIN/LBOUT pins - avoids need for external supervisor IC in portable designs. |
| Nonoverlapping gate drive timing | Hardware-enforced dead time prevents shoot-through during MOSFET transitions - enhances reliability and simplifies layout. |
Applications
| Portable Medical Instrumentation | GPS Navigation Modules |
|---|---|
Use Scenario: Powering low-noise analog front-ends and precision ADCs in handheld ECG or pulse oximeters with single-cell Li-ion input. IC Role / Device Role / Timing Role: Primary 5V synchronous buck controller regulating sensor and MCU rails; Burst Mode minimizes idle power between measurements. Use Value: 170µA standby current extends battery life beyond 72 hours per charge; fixed 5V output eliminates calibration drift from resistor tolerance. | Use Scenario: Supplying 5V to GPS RF front-end, baseband processor, and flash memory in compact automotive or wearable navigation units. IC Role / Device Role / Timing Role: High-efficiency DC/DC controller driving N-channel MOSFETs; CT-timed constant off-time ensures stable regulation despite varying satellite signal load. Use Value: >95% peak efficiency reduces thermal load in sealed enclosures; LBOUT pin triggers firmware-initiated graceful shutdown before battery depletion. |
| Industrial Handheld Scanners | Cellular IoT Edge Sensors |
Use Scenario: Converting 7–18V industrial battery or USB-PD input to regulated 5V for laser diode drivers and image sensors in rugged barcode scanners. IC Role / Device Role / Timing Role: Wide-input synchronous controller supporting both P-channel (for 18V dropout) and N-channel (for 10A peak current) configurations via PINV pin. Use Value: 20V absolute max input withstands load-dump transients; programmable burst inhibit (BINH) ensures clean power during high-speed image capture bursts. | Use Scenario: Providing 5V rail to NB-IoT modem, environmental sensors, and BLE radio in solar-charged remote telemetry nodes. IC Role / Device Role / Timing Role: Ultra-low-quiescent buck controller enabling multi-year battery life; integrated low-battery detection replaces discrete voltage monitor. Use Value: 1mW no-load power at 5V input maximizes energy harvesting efficiency; SENSE–/SENSE+ current sensing enables accurate end-of-life battery prediction. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3866EUF#PBF | Higher 500kHz–2MHz frequency range; supports external VREF; no integrated low-battery detector. | Targeted at higher-density, faster-transient applications; lacks LBIN/LBOUT functionality for battery monitoring. | Select when higher switching frequency or adjustable output is required; not drop-in due to different pinout and missing battery features. |
| MP2315GJ-Z | Integrated power MOSFETs (no external FETs); lower 4.5–28V input; fixed 5V output; no Burst Mode or low-battery detection. | Designed for space-constrained, cost-sensitive applications; sacrifices design flexibility and battery-aware features for integration. | Choose for simplified BOM and layout where external FET control and battery monitoring are unnecessary. |
Compared with LTC3866EUF#PBF and MP2315GJ-Z, the LTC1266CS-5#TRPBF uniquely combines external MOSFET control, programmable Burst Mode, and integrated low-battery detection in a 16-pin SOIC - making it optimal for portable systems requiring long battery life, wide input range, and intelligent power management.
Availability
LTC1266CS-5#TRPBF is available at Aetrix Electronics and suitable for portable instrumentation, GPS navigation modules, and industrial handheld scanners requiring stable component supply and long-term lifecycle support.
Supply support for LTC1266CS-5#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, formed through the acquisition of Linear Technology in 2017.
The LTC1266 series belongs to ADI's legacy high-efficiency power management portfolio, engineered specifically for battery-operated portable electronics demanding ultralow quiescent current, flexible MOSFET topology selection, and integrated system-monitoring functions.
FAQ
What is the output voltage tolerance of the LTC1266CS-5#TRPBF under full load and temperature variation?
The LTC1266CS-5#TRPBF delivers a fixed 5V output with guaranteed regulation of 4.90V to 5.20V across –40°C to 85°C ambient temperature and 5mA–2A load range. This ±3% tolerance includes line, load, and temperature effects - verified per Electrical Characteristics table in the official datasheet, with typical performance centered at 5.05V.
Can the LTC1266CS-5#TRPBF drive an N-channel MOSFET on the high side without a bootstrap circuit?
No - the LTC1266CS-5#TRPBF requires a bootstrap or external high-side gate driver when using an N-channel MOSFET on the high side, because its TDRIVE pin swings only from ground to PWR VIN. For true single-supply N-channel high-side operation, a charge-pump or floating supply is needed; alternatively, use P-channel for simpler dropout operation.
How does the Burst Mode operation of the LTC1266CS-5#TRPBF affect output voltage ripple?
In Burst Mode, the LTC1266CS-5#TRPBF reduces switching frequency dynamically to maintain regulation at light loads, resulting in 50mVP-P typical output ripple at 150mA load. This is higher than continuous-mode ripple but remains within specification; the trade-off enables 170µA quiescent current and >90% efficiency below 500mA.
What is the purpose of the ITH pin (Pin 7) on the LTC1266CS-5#TRPBF, and how should it be decoupled?
The ITH pin on the LTC1266CS-5#TRPBF is the gain amplifier decoupling node that stabilizes the current comparator threshold. It must be bypassed to SGND with a 100nF ceramic capacitor placed as close as possible to the pin - this prevents oscillation and ensures accurate current sensing across load and temperature variations.
Does the LTC1266CS-5#TRPBF support short-circuit protection, and how does it behave during fault conditions?
Yes - the LTC1266CS-5#TRPBF provides short-circuit protection by automatically extending tOFF during overcurrent events, allowing inductor current to decay fully between cycles. This limits average short-circuit current to approximately the programmed IMAX, preventing thermal runaway while maintaining safe operation until the fault is cleared.
LTC1266CS-5#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-5#TRPBF FAQ
1.How can I place an order for LTC1266CS-5#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1266CS-5#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-5#TRPBF reliable?
The price and inventory of LTC1266CS-5#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-5#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1266CS-5#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1266CS-5#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1266CS-5#TRPBF?
LTC1266CS-5#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1266CS-5#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-5#TRPBF?
For technical support, including LTC1266CS-5#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1266CS-5#TRPBF requirements.
6.How does Aetrix verify that LTC1266CS-5#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1266CS-5#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-5#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1266CS-5#TRPBF?
All LTC1266CS-5#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1266CS-5#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-5#TRPBF part is unused and in its original packaging.
Return procedure for LTC1266CS-5#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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