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Analog Devices Inc. LTC1265CS-3.3#TRPBF
- Part No.:
- LTC1265CS-3.3#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1265CS-3.3#TRPBF.pdf
- Description:
- IC REG BUCK BOOST 3.3V 1.2A 14SO
- Quantity:
- Payment:
- Shipping:
Inventory:3,591
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Product details
Overview
LTC1265CS-3.3#TRPBF from Analog Devices (formerly Linear Technology) is a monolithic step-down DC/DC converter IC with fixed 3.3V output, internal 0.3Ω P-channel MOSFET switch, current-mode control, and Burst Mode™ operation for ultra-low quiescent current. It delivers up to 1.2A output current from 5.4V–12V input, achieves up to 95% efficiency, and supports low-dropout 100% duty-cycle operation. It is used in battery-powered portable instruments requiring stable 3.3V rail generation.
For engineers reviewing the LTC1265CS-3.3#TRPBF datasheet, LTC1265CS-3.3#TRPBF pinout, LTC1265CS-3.3#TRPBF application, or LTC1265CS-3.3#TRPBF equivalent, key selection criteria include its fixed 3.3V output voltage tolerance (±2.4% over temperature), 160µA light-load sleep current, 5µA shutdown current, 14-pin SO package footprint, and integrated low-battery detection comparator with 1.25V reference.
Technical Context
The LTC1265CS-3.3#TRPBF employs a constant off-time current-mode architecture where switching frequency varies with (VIN – VOUT); CT pin (Pin 5) sets off-time via external capacitor discharge proportional to VOUT. Output voltage is set by an internal resistive divider connected between SENSE– (Pin 7) and ground - no external feedback resistors required.
Burst Mode™ operation activates automatically below ~250mA load, reducing gate charge losses by disabling the power stage and entering 160µA standby mode; regulation is maintained via hysteretic voltage comparator control. Short-circuit protection is implemented by extending off-time when peak inductor current exceeds 150mV/RSENSE, limiting average fault current to ~IOUT(MAX).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±2.4% (3.22V–3.40V) at 800mA load over full temperature range |
| Input Voltage Range | 5.4V to 12V DC - supports single-cell Li-ion + boost or dual-cell NiMH inputs |
| Max Output Current | 1.2A continuous - limited by internal 0.3Ω (typ) RDS(ON) switch and thermal design |
| Quiescent Current | 160µA in sleep mode (Burst Mode active), 5µA in shutdown - enables multi-year battery life |
| Efficiency | Up to 95% at 800mA (VIN = 9V, VOUT = 3.3V) - reduces thermal stress and extends runtime |
| Switching Architecture | Constant off-time current-mode control - provides fast transient response and inherent cycle-by-cycle current limiting |
| Low-Battery Detection | Integrated comparator with 1.25V reference and open-drain LBOUT (Pin 3) - triggers at 1.15V–1.35V input threshold |
Pinout & Package
14-pin plastic SOIC (SO-14) package, 1.27mm pitch, JEDEC MS-012AC, θJA = 110°C/W. Exposed pad not present. RoHS-compliant, Pb-free, #TRPBF suffix denotes tape-and-reel packaging.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PWR VIN (Pins 1, 13) | Power MOSFET driver supply | Must be tied together and decoupled locally to PGND; supplies gate drive for internal P-MOSFET |
| VIN (Pin 2) | Main control circuit supply | Provides bias for oscillator, comparators, and logic; separate from power switch supply |
| LBOUT (Pin 3) | Open-drain low-battery indicator | Sinks current when LBIN (Pin 4) falls below 1.25V; high-impedance in shutdown |
| LBIN (Pin 4) | Inverting input of low-battery comparator | Accepts external resistor divider from VIN to set trip point; 0.5µA input bias |
| CT (Pin 5) | Off-time timing capacitor node | External capacitor (e.g., 130pF) sets tOFF; discharge current scales with VOUT |
| ITH (Pin 6) | Current comparator threshold control | Voltage here sets trip level for SENSE+ vs SENSE–; decoupling improves stability |
| SENSE– (Pin 7) | Current sense and output voltage reference | Connects to internal 3.3V divider midpoint; also serves as (–) input for current comparator |
| SENSE+ (Pin 8) | Current sense positive input | Paired with SENSE– across RSENSE; built-in offset enables 25mV–150mV trip range |
| N/C (Pin 9) | No connect | Not bonded internally on LTC1265CS-3.3#TRPBF - differs from adjustable LTC1265 version |
| SHDN (Pin 10) | Active-high micropower shutdown | Logic-high ≥1.2V disables switching; draws <15µA; must not float |
| SGND (Pin 11) | Small-signal ground reference | Return for COUT (–), VFB, and analog circuitry; must be routed separately from PGND |
| PGND (Pin 12) | Power ground return | Return for CIN (–), Schottky anode, and switch driver; high di/dt path |
| SW (Pin 14) | Drain of internal P-channel MOSFET | Switching node; connects to Schottky cathode and inductor; max voltage = VIN – 13V |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 3.3V output with internal divider | Eliminates external feedback resistors and layout sensitivity - simplifies BOM and improves production yield |
| Burst Mode™ operation | Reduces light-load IQ to 160µA while maintaining tight output regulation - critical for always-on battery systems |
| 100% duty-cycle low-dropout mode | Enables VOUT ≈ VIN operation during battery depletion - maximizes usable cell voltage range |
| Integrated low-battery detector | Provides system-level battery health monitoring without external comparators or references |
| Current-mode control with RSENSE | Enables precise peak-current limiting and inherent line/load transient immunity - no compensation network needed |
Applications
| Portable Medical Sensors | Industrial Handheld Terminals |
|---|---|
|
Use Scenario: Battery-powered glucose meter with LCD display and Bluetooth LE radio operating from single 3.7V Li-ion cell. IC Role / Device Role / Timing Role: Primary 3.3V power rail generator for MCU, sensor interface, and RF transceiver - replaces discrete buck controller + external FET. Use Value: 95% efficiency at 250mA extends battery life to >12 months; 160µA sleep current enables low-power wake-on-event operation. |
Use Scenario: Ruggedized warehouse scanner using dual AA alkaline cells (2.4V–3.2V) with 3.3V logic and imager subsystem. IC Role / Device Role / Timing Role: Step-up/step-down hybrid regulator - operates in dropout down to 3.2V input while maintaining regulated 3.3V output. Use Value: 100% duty-cycle operation extracts full energy from aging batteries; integrated LBOUT signals end-of-life before system reset. |
| Wireless IoT Edge Nodes | Memory Backup Power Supplies |
|
Use Scenario: LoRaWAN soil moisture sensor node powered by CR2032 coin cell, transmitting every 15 minutes. IC Role / Device Role / Timing Role: Ultra-low-IQ DC/DC converter supplying 3.3V to microcontroller and RF module during brief transmit bursts. Use Value: 5µA shutdown current preserves coin cell capacity for >5 years; Burst Mode ensures stable 3.3V during 100ms active windows. |
Use Scenario: SRAM backup in industrial PLC controller requiring fail-safe 3.3V hold-up during main power interruption. IC Role / Device Role / Timing Role: Low-noise, low-ripple 3.3V source for volatile memory retention - accepts wide input from supercapacitor or backup battery. Use Value: 50mVP-P Burst Mode ripple avoids false SRAM write errors; 0.3Ω RDS(ON) minimizes voltage drop during hold-up decay. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1935ES5-3.3#TRMPBF | 5-pin TSOT-23, 1.25MHz fixed-frequency, 600mA max, no Burst Mode, higher IQ (1.1mA) | Lacks low-IQ sleep mode and low-battery detection; suited for space-constrained but non-battery-critical apps | Select if board area is primary constraint and >1mA quiescent current is acceptable |
| TPS62231DRYR | 6-pin WSON, 3MHz synchronous, 400mA, 17µA IQ in PWM mode, no integrated LBO | Higher switching frequency enables smaller passives but lacks analog low-battery comparator output | Choose when high-frequency operation and minimal footprint outweigh need for battery monitoring |
Compared with LTC1265CS-3.3#TRPBF, LT1935ES5-3.3#TRMPBF trades Burst Mode efficiency and LBO integration for 40% smaller footprint, while TPS62231DRYR offers synchronous rectification and higher frequency but requires external LBO circuitry and delivers only one-third the output current.
Availability
LTC1265CS-3.3#TRPBF is available at Aetrix Electronics and suitable for portable medical sensors, industrial handheld terminals, wireless IoT edge nodes, and memory backup power supplies requiring stable component supply, long-lifecycle support, and guaranteed traceable sourcing.
Supply support for LTC1265CS-3.3#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 LTC1265CS-3.3#TRPBF belongs to ADI's legacy Linear Technology power management portfolio, designed specifically for high-efficiency, low-quiescent-current DC/DC conversion in battery-powered portable equipment where runtime and reliability are critical.
FAQ
What is the output voltage accuracy of the LTC1265CS-3.3#TRPBF over temperature?
The LTC1265CS-3.3#TRPBF guarantees a 3.3V output with ±2.4% tolerance (3.22V to 3.40V) across the full operating temperature range (0°C to 70°C for the 'C' grade). This specification is confirmed in the Electrical Characteristics table under VOUT for LTC1265-3.3, with test conditions at 800mA load and full temperature sweep.
Does the LTC1265CS-3.3#TRPBF require external feedback resistors to set the output voltage?
No, the LTC1265CS-3.3#TRPBF does not require external feedback resistors. It uses an internal precision resistive divider connected to SENSE– (Pin 7) to fix the output at 3.3V. Pin 9 (VFB) is unconnected (N/C) on this variant - unlike the adjustable LTC1265, which requires external R1/R2.
What is the minimum input voltage required for the LTC1265CS-3.3#TRPBF to regulate 3.3V output?
The LTC1265CS-3.3#TRPBF begins regulating at input voltages as low as 3.3V due to its 100% duty-cycle low-dropout capability. However, the Absolute Maximum Ratings specify minimum input as –0.3V, and functional operation starts reliably at 5.4V per the datasheet's recommended operating conditions - below that, performance (efficiency, load regulation) is not characterized.
How does the LTC1265CS-3.3#TRPBF achieve low quiescent current in light-load conditions?
The LTC1265CS-3.3#TRPBF achieves 160µA quiescent current via Burst Mode™ operation: when load current drops below ~250mA, it disables the power stage, enters sleep mode, and maintains regulation using only the hysteretic voltage comparator. In shutdown (SHDN = HIGH), IQ drops further to 5µA typical.
Can the LTC1265CS-3.3#TRPBF be used with a 12V input and 3.3V/1.2A output?
Yes, the LTC1265CS-3.3#TRPBF supports 12V input and delivers 1.2A at 3.3V output, as verified in Figure 1 (High Efficiency Step-Down Converter) and Typical Performance Characteristics (Efficiency vs Load Current at VIN = 12V). Thermal design must accommodate power dissipation: at 12V→3.3V/1.2A, conduction loss is ~10.4W × 0.3Ω = 0.31W, requiring adequate PCB copper area or heatsinking.
LTC1265CS-3.3#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down, Step-Up/Step-Down
- Output Configuration:
- Positive or Negative
- Topology:
- Buck, Buck-Boost, SEPIC
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4V
- Voltage - Input (Max):
- 13V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- -
- Current - Output:
- 1.2A (Switch)
- Frequency - Switching:
- Up to 700kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SO
LTC1265CS-3.3#TRPBF FAQ
1.How can I place an order for LTC1265CS-3.3#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1265CS-3.3#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 LTC1265CS-3.3#TRPBF reliable?
The price and inventory of LTC1265CS-3.3#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1265CS-3.3#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1265CS-3.3#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1265CS-3.3#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1265CS-3.3#TRPBF?
LTC1265CS-3.3#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1265CS-3.3#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 LTC1265CS-3.3#TRPBF?
For technical support, including LTC1265CS-3.3#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1265CS-3.3#TRPBF requirements.
6.How does Aetrix verify that LTC1265CS-3.3#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1265CS-3.3#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 LTC1265CS-3.3#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1265CS-3.3#TRPBF?
All LTC1265CS-3.3#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1265CS-3.3#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 LTC1265CS-3.3#TRPBF part is unused and in its original packaging.
Return procedure for LTC1265CS-3.3#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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