My Inquiry
My Account
Analog Devices Inc. LTC1266CS#TRPBF
- Part No.:
- LTC1266CS#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1266CS#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,475
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LTC1266CS#TRPBF 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 up to 5A output with 95%+ efficiency. It features pin-selectable Burst Mode™ operation, 1.265V internal reference, 170µA light-load standby current, and integrated low-battery detection. Used in portable computing power rails where high efficiency across wide load range is critical.
For engineers reviewing the LTC1266CS#TRPBF datasheet, LTC1266CS#TRPBF pinout, LTC1266CS#TRPBF application, or LTC1266CS#TRPBF equivalent, key selection criteria include its constant off-time current-mode architecture, dual-mode (Burst/continuous) operation, programmable current sense threshold (135–175mV), and support for both N- and P-channel topside switches - all validated for notebook DC-DC conversion at 3.3V/5V outputs.
Technical Context
The LTC1266CS#TRPBF implements a constant off-time (COT) current-mode control architecture with external timing capacitor (CT) setting operating frequency up to 400kHz. Its dual-mode operation automatically transitions between continuous conduction mode (CCM) and Burst Mode™ based on load, maintaining >95% efficiency from 100mA to 5A while reducing quiescent current to 170µA at light loads.
It integrates independent drive outputs (TDRIVE for topside, BDRIVE for bottom-side), phase-invert logic (PINV) to configure N- or P-channel topology, burst inhibit (BINH), and a dedicated low-battery comparator (LBIN/LBOUT) with 1.25V internal reference and ±100mV trip hysteresis. All gate drives feature nonoverlapping logic to prevent shoot-through.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5V to 20V - supports wide-input battery-powered systems including 5V, 9V, 12V, and 19V rails. |
| Feedback Reference | 1.265V ±15mV - enables precise output regulation via external resistor divider or fixed-output variants. |
| Current Sense Threshold | 135–175mV (Burst enabled) - sets peak inductor current; determines max output capability with RSENSE. |
| Standby Current | 170µA typical - minimizes no-load power loss, enabling <1mW VIN=5V standby consumption. |
| Off-Time | 4–6µs (CT=390pF) - defines minimum switch-off duration; scales with VOUT to maintain constant ripple current. |
| Shutdown Current | 25–60µA - ensures ultra-low power state when SHDN pin >0.8V. |
| Low-Battery Trip | 1.14–1.42V (VIN-dependent) - provides accurate undervoltage lockout with hysteresis for system brownout protection. |
Pinout & Package
Package: 16-pin narrow SOIC (0.150" width), RoHS-compliant, surface-mount.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| TDRIVE (Pin 1) | Topside MOSFET gate driver | High-current output swinging from PWR VIN to ground; supports N- or P-channel configuration per PINV. |
| PWR VIN (Pin 2) | Driver power supply | Separate supply for gate drivers; must be decoupled locally to PGND to minimize noise coupling. |
| PINV (Pin 3) | Phase invert select | 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-high disables Burst Mode, forcing continuous operation down to zero load. |
| VIN (Pin 5) | Main input supply | Primary power input (3.5–20V); powers internal circuitry except gate drivers. |
| CT (Pin 6) | Timing capacitor connection | Sets off-time and operating frequency; discharge current proportional to VOUT for ripple compensation. |
| ITH (Pin 7) | Gain amplifier decoupling | Adjusts current comparator threshold dynamically with load; connects to RC network for loop compensation. |
| SENSE– (Pin 8) | Current sense (–) / VOUT divider tap | Connects to shunt resistor (–) terminal and internal resistive divider for fixed-output versions (3.3V/5V). |
| SENSE+ (Pin 9) | Current sense (+) | Connects to shunt resistor (+) terminal; built-in offset vs SENSE– sets current trip point. |
| VFB (Pin 10) | Feedback input | Used only in adjustable version; connects to external resistor divider to set VOUT; NC on LTC1266CS-3.3/5. |
| SHDN (Pin 11) | Shutdown control | Active-high CMOS input; >0.8V forces micropower shutdown (<60µA IQ). |
| SGND (Pin 12) | Small-signal ground | Reference for feedback, sense, and logic circuits; must be routed separately from PGND to avoid noise injection. |
| LBIN (Pin 13) | Low-battery comparator input | Compares against 1.25V internal reference; trip point varies with VIN (1.14–1.42V). |
| LBOUT (Pin 14) | Low-battery open-drain output | Sinks current when LBIN < reference; used to signal host MCU of battery undervoltage condition. |
| PGND (Pin 15) | Power ground | Return path for TDRIVE, BDRIVE, and CIN; connects to source of N-channel MOSFET and CIN (–). |
| BDRIVE (Pin 16) | Bottom-side MOSFET gate driver | High-current output swinging from ground to PWR VIN; always drives N-channel MOSFET. |
Key Features
| Feature | Design Value |
|---|---|
| Automatic Burst Mode™ operation | Maintains >95% efficiency at 100mA–5A while reducing IQ to 170µA at light loads - eliminates need for external enable sequencing. |
| Pin-selectable N-/P-channel topology | Single-pin (PINV) configures driver phase and on-time limit - enables optimal trade-off between efficiency (N-ch) and simplicity (P-ch) without redesign. |
| Integrated low-battery detector | Dedicated comparator with VIN-compensated trip point (1.14–1.42V) and open-drain output - provides reliable system-level brownout signaling without external components. |
| Nonoverlapping gate drive logic | Hardware-enforced dead time prevents shoot-through during MOSFET transitions - eliminates risk of cross-conduction failure in high-current designs. |
| Constant off-time current-mode control | CT-based timing with VOUT-proportional discharge current ensures stable ripple current across input/output voltage ranges - simplifies loop compensation. |
Applications
| Notebook Power Rail | Portable Instrument Supply |
|---|---|
Use Scenario: Regulating 5V or 3.3V core logic rails in ultraportable notebooks with Li-ion battery input (7–12V). IC Role / Device Role / Timing Role: Primary synchronous buck controller managing CPU I/O, memory, and peripheral power domains. Use Value: Delivers 95%+ efficiency at 2.5A load and <1mW standby at 0A, extending battery runtime by >12% versus standard PWM controllers. | Use Scenario: Powering precision analog front-ends and microcontrollers in handheld test equipment with 9V battery input. IC Role / Device Role / Timing Role: High-efficiency, low-noise DC-DC converter supplying clean 3.3V to ADCs, op-amps, and wireless transceivers. Use Value: Burst Mode™ operation maintains <20mV output ripple at 10mA–1A loads, eliminating need for post-regulation LDOs. |
| Cellular Baseband Power | GPS Receiver Module |
Use Scenario: Generating 1.8V/2.8V rails for cellular modem baseband processors in smartphones with 3.7–4.2V battery input. IC Role / Device Role / Timing Role: Secondary buck controller handling dynamic load transients during RF transmission bursts. Use Value: Current-mode architecture delivers <5µs load transient response with <100mV undershoot, preventing processor reset during TX events. | Use Scenario: Providing regulated 3.3V supply to GPS RF frontend and baseband ICs in automotive navigation units with 9–16V input. IC Role / Device Role / Timing Role: Input-wide buck controller with integrated low-battery detection for cold-cranking resilience. Use Value: LBIN/LBOUT pins enable automatic system shutdown at 1.25V reference-tracked trip point, preventing data corruption during battery sag. |
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#TRPBF | Fixed 3.3V output, integrated MOSFETs, 3.3–40V input, 1.2A max output - no external FETs required but lower current capability. | Best for space-constrained, lower-current (<1.2A) applications where board area and BOM count are prioritized over peak efficiency. | Select LT3502AEDD#TRPBF when integrating power stage reduces design complexity and thermal management burden outweighs efficiency loss. |
| TPS54202DDCR | 4.5–28V input, 2A output, integrated FETs, D-CAP2 control - no CT pin or Burst Mode, higher IQ (25µA sleep) but simpler layout. | Suitable for industrial 24V input systems requiring robustness over ultra-low-light-load efficiency. | Choose TPS54202DDCR for cost-sensitive, medium-current applications where TI's ecosystem support and qualification for extended temperature grades are advantageous. |
Compared with LT3502AEDD#TRPBF and TPS54202DDCR, the LTC1266CS#TRPBF offers superior light-load efficiency via Burst Mode™ and full external FET flexibility for high-current (>3A) or high-input-voltage (>20V) designs - making it optimal for performance-critical portable power rails where thermal headroom and battery life are paramount.
Availability
LTC1266CS#TRPBF is available at Aetrix Electronics and suitable for notebook computers, portable instrumentation, cellular baseband modules, and GPS receiver systems requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for LTC1266CS#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 technologies, serving industrial, automotive, communications, and consumer markets.
The LTC1266 series was designed by Linear Technology (acquired by ADI in 2017) specifically for high-efficiency, wide-input synchronous buck conversion in portable electronics - emphasizing adaptive light-load operation, flexible topology selection, and integrated system monitoring functions.
FAQ
What is the maximum output current supported by the LTC1266CS#TRPBF?
The LTC1266CS#TRPBF itself does not deliver current - it controls external MOSFETs. With appropriate N-channel or P-channel topside and N-channel bottom-side MOSFETs, typical designs achieve 5A continuous output. Peak current depends on RSENSE value (e.g., 0.02Ω yields ~5A IMAX), inductor saturation rating, and thermal management. The LTC1266CS#TRPBF's current sense threshold (135–175mV) and gate drive strength (±1.5A peak) are optimized for this range.
Does the LTC1266CS#TRPBF require an external feedback resistor divider?
No - the LTC1266CS#TRPBF is the adjustable version, but it uses Pin 8 (SENSE–) and Pin 9 (SENSE+) for current sensing, not VFB (Pin 10) for voltage feedback. For adjustable output, you must use the base LTC1266 part (not CS-3.3/CS-5) and connect an external resistor divider from VOUT to VFB (Pin 10) and SGND (Pin 12). The LTC1266CS#TRPBF is functionally identical to LTC1266CS and supports both configurations depending on external component selection.
How does Burst Mode™ operation improve efficiency at light loads?
Burst Mode™ reduces switching losses by disabling the power stage during light loads: the LTC1266CS#TRPBF enters sleep mode (IQ ≈ 170µA), turning off both MOSFETs and powering down most internal circuitry. Output voltage is maintained by the output capacitor until it sags enough to trigger a short burst of switching cycles. This achieves >90% efficiency at 10mA - impossible with continuous PWM - and cuts standby power to <1mW at VIN=5V, directly extending battery life in always-on portable devices using the LTC1266CS#TRPBF.
Can the LTC1266CS#TRPBF drive a P-channel MOSFET for low-dropout operation?
Yes - the LTC1266CS#TRPBF explicitly supports P-channel topside MOSFETs via PINV (Pin 3) = 0V. In this mode, TDRIVE swings from PWR VIN to ground, turning the P-FET on when low. Crucially, there is no 60µs max on-time limit, allowing 100% duty cycle in dropout - enabling regulation down to VIN – VGS(TH) (e.g., 3.5V input → 3.3V output). This makes the LTC1266CS#TRPBF ideal for battery-powered systems where minimum input voltage margin is critical.
What is the purpose of the LBIN and LBOUT pins on the LTC1266CS#TRPBF?
LBIN (Pin 13) is the input to an internal comparator referenced to 1.25V; LBOUT (Pin 14) is its open-drain output. When LBIN voltage falls below the VIN-compensated trip point (1.14–1.42V), LBOUT sinks current to signal low battery. This allows host microcontrollers to initiate graceful shutdown before brownout. Unlike generic undervoltage detectors, the LTC1266CS#TRPBF's LBIN/LBOUT is calibrated across input voltage and requires no external resistors - simplifying system-level power management in portable designs using the LTC1266CS#TRPBF.
LTC1266CS#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#TRPBF FAQ
1.How can I place an order for LTC1266CS#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1266CS#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#TRPBF reliable?
The price and inventory of LTC1266CS#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#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1266CS#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1266CS#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1266CS#TRPBF?
LTC1266CS#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1266CS#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#TRPBF?
For technical support, including LTC1266CS#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1266CS#TRPBF requirements.
6.How does Aetrix verify that LTC1266CS#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1266CS#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#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1266CS#TRPBF?
All LTC1266CS#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1266CS#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#TRPBF part is unused and in its original packaging.
Return procedure for LTC1266CS#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC1266CS#TRPBF Tags
-
UCC28C45DR
Texas Instruments
-
UCC28C40DR
Texas Instruments
-
UCC28C43DR
Texas Instruments
-
ZXSC410E6TA
Diodes Incorporated
-
LM3524DMX/NOPB
Texas Instruments
-
LM3489MMX/NOPB
Texas Instruments
-
MIC2102YML-TR
Microchip Technology
-
LM5148RGYR
Texas Instruments
-
TL598CDR
Texas Instruments
-
LM5155DSSR
Texas Instruments
-
LM25085MYX/NOPB
Texas Instruments
-
UCC2813DTR-0
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
