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Analog Devices Inc. LTC1266IS-5#TRPBF
- Part No.:
- LTC1266IS-5#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1266IS-5#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,669
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Product details
Overview
LTC1266IS-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 over load and line variations, supports input voltages from 3.5V to 20V, maintains >95% efficiency at full load, and features automatic Burst Mode™ operation for ultralow quiescent current (170µA) at light loads - ideal for battery-powered portable instrumentation and GPS systems.
For engineers reviewing the LTC1266IS-5#TRPBF datasheet, LTC1266IS-5#TRPBF pinout, LTC1266IS-5#TRPBF application, or LTC1266IS-5#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 LTC1266IS-5#TRPBF implements a constant off-time (COT) current-mode control architecture, where switching frequency varies inversely with input-output voltage differential and is set by an external CT capacitor. Its dual-mode operation-continuous conduction at medium-to-heavy loads and Burst Mode™ at light loads-enables stable regulation while minimizing standby power dissipation.
It integrates independent gate drivers (TDRIVE for topside, BDRIVE for bottom-side), internal 1.265V reference, current-sense comparator with 135–190mV threshold (VBINH = 0V), and a dedicated low-battery detection circuit with 1.14–1.42V trip point. All functions are implemented without requiring external compensation components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.05V nominal (4.90–5.20V over temp/load), eliminating need for external feedback divider. |
| Input Voltage Range | 3.5V to 20V - supports wide-range industrial and automotive supply rails, including 12V and 19V battery systems. |
| Efficiency | Up to 95% at full load - achieved via synchronous rectification and nonoverlapping gate drives that eliminate shoot-through losses. |
| Quiescent Current | 170µA in Burst Mode sleep - enables multi-day battery life in always-on portable devices with intermittent load demand. |
| Switching Architecture | Constant off-time current mode - provides inherent stability, fast transient response, and no loop compensation required. |
| Operating Temp Range | –40°C to +85°C (Industrial grade) - fully tested and guaranteed, suitable for harsh-environment embedded applications. |
| Current Sense Threshold | 135–190mV (VBINH = 0V) - sets peak inductor current; enables precise RSENSE-based current limiting and short-circuit protection. |
Pinout & Package
Package: 16-pin narrow SOIC (0.150" width), RoHS-compliant, surface-mountable with standard reflow profile.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| TDRIVE (Pin 1) | Topside MOSFET gate driver output | High-current push-pull driver (PWR VIN ↔ GND); phase determined by PINV; supports N- or P-channel switch. |
| PWR VIN (Pin 2) | Driver power supply | Separate 3.5–18V supply for gate drivers; decoupling to PGND minimizes noise coupling into control circuitry. |
| PINV (Pin 3) | Phase invert select | Logic-level input: 0V → P-channel mode (100% duty cycle in dropout); PWR VIN → N-channel mode (60µs max on-time). |
| BINH (Pin 4) | Burst Mode inhibit | CMOS input: logic high disables Burst Mode, forcing continuous operation down to zero load - critical for low-noise or constant-frequency EMI requirements. |
| VIN (Pin 5) | Main supply input | Primary input rail (3.5–20V); powers internal bias circuits and feeds CT timing network. |
| CT (Pin 6) | Timing capacitor connection | External capacitor sets off-time (and thus operating frequency); discharge current proportional to VOUT ensures consistent ripple current across input range. |
| ITH (Pin 7) | Gain amplifier decoupling | Internal node for current comparator threshold adjustment; bypassing improves noise immunity and load-transient response. |
| SENSE– (Pin 8) | Current sense (–) / fixed-VOUT reference tap | In LTC1266IS-5#TRPBF: connects to internal resistive divider setting 5V output; also (–) input of current comparator. |
| SENSE+ (Pin 9) | Current sense (+) | (+) input of current comparator; offset vs SENSE– defines current trip threshold (e.g., 155mV typical) across shunt resistor RSENSE. |
| VFB (Pin 10) | Feedback input | No-connect (NC) in fixed-output LTC1266IS-5#TRPBF; used only in adjustable versions for external resistor divider. |
| SHDN (Pin 11) | Shutdown control | Active-high CMOS input (0.5–2V threshold); pulls both drivers low and reduces IQ to <50µA - enables system-level power sequencing. |
| SGND (Pin 12) | Small-signal ground | Dedicated analog ground return for feedback and sense paths; must be routed separately from PGND to avoid noise injection. |
| LBIN (Pin 13) | Low-battery comparator input | Monitors external supply voltage against internal 1.25V reference; trip point calibrated to 1.14–1.42V depending on VIN. |
| LBOUT (Pin 14) | Low-battery open-drain output | Sinks up to 8mA when LBIN < reference; directly drives LED or microcontroller interrupt without pull-up. |
| PGND (Pin 15) | Power ground | Return path for TDRIVE, BDRIVE, and CIN; must connect to source of N-channel MOSFET and (–) terminal of input capacitor. |
| BDRIVE (Pin 16) | Bottom-side MOSFET gate driver | High-current driver (GND ↔ PWR VIN); synchronously commutates with TDRIVE to replace Schottky diode losses. |
Key Features
| Feature | Design Value |
|---|---|
| Automatic Burst Mode™ operation | Reduces IQ to 170µA at light loads while maintaining tight output regulation - eliminates need for external enable/disable logic in battery-critical designs. |
| Pin-selectable N- or P-channel topside drive | Single-pin configuration (PINV) selects optimal topology: N-channel for high-current efficiency (>3A), P-channel for ultra-low dropout (<100mV) and simplified bootstrap-free layout. |
| Integrated low-battery detector | On-chip comparator with user-configurable trip point (via resistor divider on LBIN) and open-drain LBOUT output - replaces discrete supervisor IC in portable systems. |
| Nonoverlapping gate drive logic | Hardware-enforced dead time prevents simultaneous conduction of top/bottom MOSFETs - eliminates shoot-through current and associated thermal stress. |
| Constant off-time current-mode control | Eliminates need for external compensation network; provides inherent stability across wide input/output ranges and load transients. |
Applications
| Portable Instrumentation | GPS Navigation Systems |
|---|---|
Use Scenario: Handheld multimeters and data loggers powered by single-cell Li-ion or alkaline batteries requiring stable 5V rail under variable load (10mA–2A). IC Role / Device Role / Timing Role: Primary synchronous buck controller managing power conversion, battery monitoring (LBIN/LBOUT), and load-dependent efficiency optimization. Use Value: Burst Mode™ extends battery runtime by >3× versus continuous-mode controllers at standby; 170µA IQ enables weeks of sleep-mode operation. | Use Scenario: Automotive-grade GPS receivers needing clean, regulated 5V supply with immunity to engine cranking dips (5–16V input) and thermal cycling. IC Role / Device Role / Timing Role: High-reliability DC/DC controller with industrial-temp grade (-40°C to +85°C), low-battery warning, and robust short-circuit protection. Use Value: P-channel mode enables <100mV dropout at 12V→5V conversion during cold-crank events; integrated LBOUT triggers firmware shutdown before brownout. |
| Notebook Subsystem Power | DC Power Distribution |
Use Scenario: Secondary 5V rail generation for USB peripherals or display backlight drivers in compact notebook designs with strict board space constraints. IC Role / Device Role / Timing Role: Compact, high-efficiency synchronous controller replacing discrete buck IC + external MOSFETs; supports layout-optimized N-channel topology. Use Value: 16-pin SOIC footprint and no external compensation reduce BOM count and PCB area; >95% efficiency minimizes thermal pad requirements. | Use Scenario: Distributed 5V power in industrial IoT gateways where multiple sensor nodes draw intermittent current from a central 12V/24V bus. IC Role / Device Role / Timing Role: Scalable, pin-configurable controller enabling identical layout across multiple subsystems (e.g., 3.3V/5V variants) with minimal redesign. Use Value: BINH pin allows forced continuous mode for EMI-sensitive zones; same PCB supports LTC1266IS-3.3 or LTC1266IS-5 via simple resistor change. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3866EFE#PBF | Higher integration: includes MOSFET drivers, precision 0.6V reference, and PMBus interface; requires external compensation; 4–36V input. | Targeted at higher-current (>10A), digitally controlled systems requiring telemetry and fault logging. | Select LTC3866EFE#PBF only if digital control, higher VIN, or telemetry are required - adds complexity and cost for basic 5V/2A applications. |
| TPS54202DDCR | Integrated FETs (2A), fixed 5V option available; 4.5–28V input; no Burst Mode - uses D-CAP2 control with 18µA IQ in sleep. | Better suited for space-constrained designs where external MOSFETs are undesirable; lacks low-battery detection and P-channel support. | Choose TPS54202DDCR for simplified layout and lower component count where 2A output and no LBIN/LBOUT are acceptable. |
Compared with LTC3866EFE#PBF and TPS54202DDCR, the LTC1266IS-5#TRPBF offers unique value in industrial portable systems requiring ultra-low IQ, programmable topology (N/P-channel), and integrated battery monitoring - without sacrificing simplicity or cost.
Availability
LTC1266IS-5#TRPBF is available at Aetrix Electronics and suitable for portable instrumentation, GPS navigation systems, and notebook subsystem power requiring stable component supply, long-term lifecycle support, and industrial temperature qualification.
Supply support for LTC1266IS-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, specifically engineered for battery-critical portable and industrial applications demanding ultralow quiescent current, flexible MOSFET topology, and integrated system supervision functions.
FAQ
What is the output voltage tolerance of the LTC1266IS-5#TRPBF over temperature and load?
The LTC1266IS-5#TRPBF delivers a fixed 5V output with guaranteed regulation of ±1.5% (4.90V to 5.20V) across –40°C to +85°C ambient temperature and load currents from 5mA to 2A. This specification is validated per the Electrical Characteristics table in the official datasheet and applies to the IS-grade industrial version, not the commercial CS variant.
Can the LTC1266IS-5#TRPBF drive a P-channel MOSFET for ultra-low dropout operation?
Yes - the LTC1266IS-5#TRPBF supports P-channel high-side MOSFETs via the PINV pin (Pin 3). When PINV is held at 0V, the TDRIVE output swings from 0V to PWR VIN, enabling 100% duty cycle operation and dropout limited only by the RDS(ON) of the P-MOSFET and inductor DCR - ideal for applications like automotive cold-crank where VIN may dip below 6V.
How does the Burst Mode™ operation improve efficiency at light loads in the LTC1266IS-5#TRPBF?
Burst Mode™ reduces switching losses by disabling the oscillator and entering sleep mode when output voltage reaches regulation. In this state, both MOSFETs turn off and the output capacitor supplies load current until voltage drops below hysteresis threshold - then a single switching cycle restores regulation. This cuts IQ from 2.1mA to 170µA, achieving >85% efficiency even at 10mA load, as verified in Figure G03 of the LTC1266 datasheet.
What is the function of the LBIN and LBOUT pins on the LTC1266IS-5#TRPBF?
LBIN (Pin 13) is the input to an internal comparator referenced to 1.25V; it monitors an external voltage divider from VIN to detect low-battery conditions. LBOUT (Pin 14) is an open-drain output that sinks up to 8mA when LBIN falls below the trip point (1.14–1.42V, depending on VIN). This pair replaces discrete supervisors in portable systems - for example, driving an MCU interrupt or red LED indicator directly.
Is the LTC1266IS-5#TRPBF pin-compatible with other members of the LTC1266 family?
Yes - all LTC1266 variants (including LTC1266IS-3.3, LTC1266CS-5, and LTC1266AIS) share identical 16-pin SOIC pinouts and electrical interfaces. The LTC1266IS-5#TRPBF differs only in output voltage (5V fixed), temperature grade (–40°C to +85°C), and minor parameter tolerances (e.g., tighter VFB drift); no PCB changes are needed when migrating between IS-grade fixed-output versions.
LTC1266IS-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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SO
LTC1266IS-5#TRPBF FAQ
1.How can I place an order for LTC1266IS-5#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1266IS-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 LTC1266IS-5#TRPBF reliable?
The price and inventory of LTC1266IS-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 LTC1266IS-5#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1266IS-5#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1266IS-5#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1266IS-5#TRPBF?
LTC1266IS-5#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1266IS-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 LTC1266IS-5#TRPBF?
For technical support, including LTC1266IS-5#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1266IS-5#TRPBF requirements.
6.How does Aetrix verify that LTC1266IS-5#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1266IS-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 LTC1266IS-5#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1266IS-5#TRPBF?
All LTC1266IS-5#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1266IS-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 LTC1266IS-5#TRPBF part is unused and in its original packaging.
Return procedure for LTC1266IS-5#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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