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Analog Devices Inc. LTC1266AIS#TRPBF
- Part No.:
- LTC1266AIS#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1266AIS#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,393
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Product details
Overview
LTC1266AIS#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 features constant off-time current mode control, pin-selectable Burst Mode™ operation, 1% output voltage accuracy (VFB = 1.246–1.290 V), wide 3.5V–20V input range, and 170 µA standby current. It is used in portable power systems requiring tight regulation and ultrahigh efficiency at light loads, such as GPS receivers and battery-powered instrumentation.
For engineers reviewing the LTC1266AIS#TRPBF datasheet, LTC1266AIS#TRPBF pinout, LTC1266AIS#TRPBF application, or LTC1266AIS#TRPBF equivalent, key selection criteria include its programmable current sense threshold (135–190 mV), burst-mode enable/disable via BINH pin, phase-invert control for MOSFET topology selection, low-battery detection interface (LBIN/LBOUT), and compatibility with both single-supply (N-channel topside) and dropout-optimized (P-channel topside) configurations.
Technical Context
The LTC1266AIS#TRPBF 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 (across RSENSE) against a programmable threshold. Its dual-mode operation-continuous conduction above ~500 mA and automatic Burst Mode™ below-enables >95% efficiency across 0–5 A load range while limiting light-load quiescent power to 1 mW at VIN = 5 V.
It integrates independent gate drivers (TDRIVE for topside, BDRIVE for bottom-side), nonoverlapping logic to prevent shoot-through, on-chip low-battery comparator (trip point 1.14–1.42 V), and separate PWR VIN supply for driver biasing. Pin 3 (PINV) selects MOSFET topology (0 V = P-channel, PWR VIN = N-channel), directly affecting max on-time (60 µs limit in N-channel mode) and dropout behavior (100% duty cycle enabled in P-channel mode).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VFB Accuracy | 1.246–1.290 V (±1% over –40°C to +85°C); enables precise output regulation using external divider or fixed-output variants. |
| Input Voltage Range | 3.5 V to 20 V (absolute max); supports wide-input industrial and battery-fed systems including 12 V automotive and 5 V USB-PD rails. |
| Standby Current | 170–260 µA (sleep mode); reduces no-load power loss to ~1 mW at 5 V input, critical for always-on portable devices. |
| Burst Mode Threshold | Pin-selectable via BINH (0.8–2.0 V logic threshold); disables burst mode when high, forcing continuous operation down to zero load. |
| Current Sense Threshold | 135–190 mV (VBINH = 2.1 V); sets peak inductor current; determines max output current and ripple magnitude with RSENSE. |
| Off-Time (tOFF) | 3.8–7.0 µs (CT = 390 pF, ILOAD = 700 mA); defines minimum switch-off duration and inversely scales with operating frequency. |
| Low-Battery Detection | 1.14–1.42 V trip (VIN-dependent); open-drain LBOUT sinks up to 8 mA when LBIN falls below internal 1.25 V reference. |
Pinout & Package
Package: 16-pin narrow SOIC (0.150" width), RoHS-compliant, rated for –40°C to +85°C industrial temperature range.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| TDRIVE (1) | Topside MOSFET gate driver output | High-current push-pull output swinging from PWR VIN to GND; drives N- or P-channel topside switch per PINV setting. |
| PWR VIN (2) | Driver power supply | Dedicated bias rail for gate drivers; must be decoupled locally to PGND to minimize noise coupling into sensitive analog blocks. |
| PINV (3) | Phase invert select | Logic input selecting MOSFET type: 0 V → P-channel mode (no on-time limit, full dropout); PWR VIN → N-channel mode (60 µs max on-time). |
| BINH (4) | Burst Mode inhibit | CMOS-compatible input disabling automatic burst mode; forces continuous switching even at zero load when pulled high (>0.8 V). |
| VIN (5) | Main input supply | Primary power input (3.5–20 V); powers internal circuitry except gate drivers (handled by PWR VIN). |
| CT (6) | Timing capacitor connection | External capacitor sets off-time and thus operating frequency; discharge current proportional to VOUT enables input-voltage-independent regulation. |
| ITH (7) | Gain amplifier decoupling | Node where current comparator threshold is modulated; voltage here increases threshold to track load current changes. |
| SENSE– (8) | Current comparator (–) input / VOUT divider tap | In fixed-output versions (e.g., LTC1266AIS-3.3), connects to internal resistor divider; also serves as (–) input for current sensing. |
| SENSE+ (9) | Current comparator (+) input | Connects to shunt resistor high side; built-in offset vs SENSE– sets current trip threshold (25–190 mV depending on mode). |
| VFB (10) | Feedback input (adjustable version only) | Not connected in LTC1266AIS#TRPBF (fixed-output variant); used in adjustable LTC1266 to set VOUT via external resistor divider. |
| SHDN (11) | Shutdown control | Active-high CMOS input; pulls both drivers low and reduces supply current to <50 µA when >0.8 V applied. |
| SGND (12) | Small-signal ground | Separate analog ground return; must be routed independently from PGND and tied to COUT(–) to avoid noise injection into feedback path. |
| LBIN (13) | Low-battery comparator input | Input to internal comparator referenced to 1.25 V; used to monitor system battery voltage or auxiliary supply rail. |
| LBOUT (14) | Low-battery open-drain output | Sinks up to 8 mA when LBIN < 1.25 V; can drive LED, microcontroller interrupt, or power sequencer enable signal. |
| PGND (15) | Power ground | Return path for TDRIVE, BDRIVE, and CIN(–); must connect to source of N-channel topside or drain of P-channel topside MOSFET. |
| BDRIVE (16) | Bottom-side N-MOSFET gate driver | Push-pull output swinging from GND to PWR VIN; drives synchronous rectifier; timing coordinated to prevent shoot-through. |
Key Features
| Feature | Design Value |
|---|---|
| Ultrahigh efficiency >95% | Achieved via synchronous rectification, nonoverlapping gate drives, and optimized driver strength-reduces conduction and switching losses at high current. |
| Automatic Burst Mode™ operation | Reduces switching losses at light loads by entering sleep mode (170 µA IQ), then waking only when output droops beyond hysteresis band. |
| Pin-selectable MOSFET topology | PINV pin configures driver phase and on-time limit, enabling either low-dropout P-channel (100% duty cycle) or cost-efficient N-channel (60 µs max on-time) implementation. |
| Integrated low-battery detector | On-chip comparator with 1.25 V reference and open-drain LBOUT provides system-level battery monitoring without external components. |
| Constant off-time current mode | Provides inherent line/load transient immunity, stable loop response without external compensation, and predictable ripple current scaling with VOUT. |
Applications
| Portable Instrumentation Power | GPS Receiver DC/DC Conversion |
|---|---|
|
Use Scenario: Battery-powered handheld multimeters and data loggers requiring stable 3.3 V or 5 V rails with minimal self-discharge during standby. IC Role / Device Role / Timing Role: Primary synchronous buck controller regulating Li-ion or AA-pack input to fixed output; manages burst-mode transitions to extend battery life. Use Value: 170 µA sleep current and <1 mW no-load power enable multi-week operation on coin-cell or alkaline batteries. |
Use Scenario: Compact GPS modules needing efficient 3.3 V supply from variable 4–12 V vehicle or portable battery sources. IC Role / Device Role / Timing Role: Step-down controller driving external MOSFETs; uses P-channel topology for ultra-low dropout during cold-start or low-VIN conditions. Use Value: 3.5–20 V input range and P-channel support ensure reliable startup and regulation even at 4.2 V battery sag. |
| Cellular Telephone Baseband Supply | DC Power Distribution System |
|
Use Scenario: Baseband processor core voltage regulation in legacy 2G/3G handsets with tight thermal constraints and dynamic load profiles. IC Role / Device Role / Timing Role: High-efficiency synchronous controller delivering 1–3 A at 1.8–2.8 V; employs current-mode control for fast transient response to bursty RF activity. Use Value: Current mode architecture ensures <10 µs recovery from 50% load steps, maintaining baseband stability during call handoffs. |
Use Scenario: Centralized 5 V or 3.3 V distribution in industrial controllers where multiple subsystems draw varying current. IC Role / Device Role / Timing Role: Primary DC/DC controller feeding downstream LDOs or point-of-load converters; provides remote shutdown (SHDN) and low-battery signaling (LBOUT). Use Value: SHDN and LBOUT pins enable coordinated power sequencing and graceful shutdown before brownout, protecting firmware integrity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5116PWPR | Wide-input (6–100 V), current-mode controller with integrated high-side driver; requires external bootstrap diode; no built-in low-battery comparator. | Targets higher-input industrial/motor-control systems; lacks burst-mode optimization for sub-100 mA loads. | Choose LM5116PWPR for >24 V input or when integrated high-side driver simplifies layout; avoid if low-IQ sleep mode or LB detection is required. |
| TPS40210DGQR | Voltage-mode controller (not current-mode); 4.5–52 V input; no burst mode; fixed 1.22 V reference; no LBOUT/LBIN pins. | Suited for medium-power fixed-frequency designs where loop stability is prioritized over light-load efficiency. | Choose TPS40210DGQR when design requires predictable fixed-frequency operation and external compensation flexibility; not suitable for battery-critical burst-mode applications. |
Compared with LM5116PWPR and TPS40210DGQR, the LTC1266AIS#TRPBF delivers superior light-load efficiency via automatic burst mode, integrated low-battery signaling, and true current-mode transient response-but requires external MOSFETs and careful PCB layout for PGND/SGND separation.
Availability
LTC1266AIS#TRPBF is available at Aetrix Electronics and suitable for portable instrumentation, GPS receivers, cellular baseband supplies, and DC power distribution systems requiring stable component supply with guaranteed industrial temperature performance (–40°C to +85°C).
Supply support for LTC1266AIS#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 acquired Linear Technology in 2017 and maintains full product support, datasheets, and application notes for the LTC portfolio.
The LTC1266 series was designed specifically for high-efficiency, externally switched synchronous buck regulators in space- and power-constrained portable electronics, emphasizing ultralow quiescent current, topology flexibility, and robust protection features.
FAQ
What is the guaranteed operating temperature range for the LTC1266AIS#TRPBF?
The LTC1266AIS#TRPBF is tested and guaranteed over the industrial temperature range of –40°C to +85°C. This includes all electrical specifications in the datasheet marked with the "G" symbol, such as feedback voltage accuracy (1.246–1.290 V), current sense threshold (135–190 mV), and standby current (170–260 µA). The "I" grade suffix confirms full characterization across this range.
Does the LTC1266AIS#TRPBF support both N-channel and P-channel topside MOSFETs?
Yes, the LTC1266AIS#TRPBF supports both topologies via the PINV pin (Pin 3): grounding PINV configures the TDRIVE output for P-channel operation (0 V turn-on, no on-time limit), while tying PINV to PWR VIN selects N-channel mode (PWR VIN turn-on, 60 µs max on-time). This allows designers to optimize for either low-dropout (P-channel) or high-current efficiency (N-channel) based on system requirements.
How does Burst Mode™ operation improve efficiency at light loads in the LTC1266AIS#TRPBF?
Burst Mode™ reduces switching losses by disabling the power stage and entering a low-current sleep state (IQ ≈ 170 µA) when load drops below ~500 mA. The device wakes only when output voltage sags beyond hysteresis, delivering a short energy burst before returning to sleep. This achieves >90% efficiency at 10 mA load-unattainable in forced continuous mode-and cuts no-load power to ~1 mW at 5 V input.
Can the LTC1266AIS#TRPBF be used with a fixed 3.3 V output without external resistors?
Yes-the LTC1266AIS#TRPBF is the "A-grade" version of the fixed-output LTC1266-3.3 variant. It integrates an internal resistor divider referenced to the SENSE– pin (Pin 8), eliminating the need for external feedback resistors. Output voltage is factory-trimmed to 3.33 V ±3% (3.23–3.43 V) over temperature and line, with no external components required for basic operation.
What protection features are integrated into the LTC1266AIS#TRPBF?
The LTC1266AIS#TRPBF includes short-circuit protection (via extended tOFF during overload), nonoverlapping gate drive logic to prevent shoot-through, logic-controlled micropower shutdown (IQ < 50 µA), and an on-chip low-battery detector with open-drain LBOUT output. It does not integrate thermal shutdown or overvoltage protection-those functions rely on external MOSFET ratings and system-level design.
LTC1266AIS#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
LTC1266AIS#TRPBF FAQ
1.How can I place an order for LTC1266AIS#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1266AIS#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 LTC1266AIS#TRPBF reliable?
The price and inventory of LTC1266AIS#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1266AIS#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1266AIS#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1266AIS#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1266AIS#TRPBF?
LTC1266AIS#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1266AIS#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 LTC1266AIS#TRPBF?
For technical support, including LTC1266AIS#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1266AIS#TRPBF requirements.
6.How does Aetrix verify that LTC1266AIS#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1266AIS#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 LTC1266AIS#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1266AIS#TRPBF?
All LTC1266AIS#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1266AIS#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 LTC1266AIS#TRPBF part is unused and in its original packaging.
Return procedure for LTC1266AIS#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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