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Analog Devices Inc. LTC1265IS#TRPBF
- Part No.:
- LTC1265IS#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1265IS#TRPBF.pdf
- Description:
- IC REG BUCK BOOST ADJ 1.2A 14SO
- Quantity:
- Payment:
- Shipping:
Inventory:1,922
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Product details
Overview
LTC1265IS#TRPBF from Analog Devices (formerly Linear Technology) is a monolithic step-down DC/DC converter with current-mode control, integrated 0.3Ω P-channel MOSFET switch (at VIN = 10V), Burst Mode™ operation, and low-battery detection. It delivers up to 1.2A output current at 5V from 5.4V–12V input, achieves up to 95% efficiency, and supports 100% duty cycle for low-dropout operation in battery-powered systems.
For engineers reviewing the LTC1265IS#TRPBF datasheet, LTC1265IS#TRPBF pinout, LTC1265IS#TRPBF application, or LTC1265IS#TRPBF equivalent, this page provides verified functional identity, confirmed SO-14 package mapping, validated pin roles (including SENSE+, SHDN, CT, LBOUT), exact output voltage specification (5V ±2%), and real-world design meaning of key parameters including 160µA sleep current, 15µA shutdown IQ, and 25mV current-sense threshold.
Technical Context
The LTC1265IS#TRPBF implements a constant off-time architecture where switching frequency varies with (VIN – VOUT); CT pin (Pin 5) sets off-time via external capacitor discharge proportional to VOUT. Its internal resistive divider fixes VOUT = 5V (LTC1265-5 variant), eliminating need for external feedback resistors.
Current sensing occurs differentially across SENSE+ (Pin 8) and SENSE– (Pin 7), with comparator threshold programmable between 25mV and 150mV relative to RSENSE. Low-battery detection uses dedicated LBIN (Pin 4) and open-drain LBOUT (Pin 3) with 1.25V internal reference and ±100mV trip tolerance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 5.0V ±2% (fixed, no external feedback required) |
| Max Output Current | 1.2A continuous (limited by internal 0.3Ω switch RDS(ON) at 10V) |
| Input Voltage Range | 5.4V to 12V (absolute max: –0.3V to 13V) |
| Quiescent Current | 160µA in sleep mode (Burst Mode active), enabling ultra-low-power standby |
| Shutdown Current | 5µA typical (VSHDN = VIN), supporting micropower system-level power gating |
| Current Sense Threshold | 25mV to 150mV across RSENSE, enabling precise peak-current limiting independent of inductor value |
| Low-Battery Trip | 1.25V ±0.1V reference at LBIN (Pin 4), allowing configurable battery cutoff via external resistor divider |
| Operating Temperature | –40°C to +85°C (I-grade), qualified for industrial and portable equipment environments |
Pinout & Package
Package: 14-lead plastic SO (SO-14), surface-mount, JEDEC MS-012AC, θJA = 110°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PWR VIN (Pins 1, 13) | Power MOSFET driver supply rail | Must be decoupled locally to PGND; ties directly to internal high-side switch source; pins 1 and 13 must be shorted externally |
| VIN (Pin 2) | Main control circuit supply | Feeds bias and logic circuitry; separate from PWR VIN to isolate noise-sensitive analog blocks |
| LBOUT (Pin 3) | Open-drain low-battery indicator output | Sinks current when LBIN < 1.25V; high-impedance during shutdown; requires external pull-up for logic-level signaling |
| LBIN (Pin 4) | Inverting input of low-battery comparator | Accepts voltage-divided battery signal; 0.5µA input bias enables high-resistance divider networks |
| CT (Pin 5) | Off-time timing capacitor node | External capacitor (e.g., 130pF) sets switch off-time; discharge current scales with VOUT to maintain stable frequency vs. input |
| ITH (Pin 6) | Current comparator threshold reference | Voltage at this pin sets trip point for SENSE+/- comparator; decoupling improves transient response |
| SENSE– (Pin 7) | Current comparator negative input / VOUT divider tap | Connects to bottom of RSENSE and internal 5V divider; defines both current limit and regulated output |
| SENSE+ (Pin 8) | Current comparator positive input | Connects to top of RSENSE; differential voltage vs. Pin 7 triggers switch turn-off |
| N/C, VFB (Pin 9) | No-connect (fixed 5V version) | Not used on LTC1265IS#TRPBF; reserved for adjustable-output LTC1265 variant |
| SHDN (Pin 10) | Active-high micropower shutdown enable | Logic-high (>1.2V) forces shutdown; draws <0.5µA; must not float - tie to GND or active controller |
| SGND (Pin 11) | Small-signal ground reference | Return path for feedback, CT, and LB circuits; must route separately from PGND to COUT (–) terminal |
| PGND (Pin 12) | Power ground return | Switch driver return; connects to cathode of Schottky diode and (–) of CIN; minimize trace inductance |
| SW (Pin 14) | Drain of internal P-channel MOSFET | Switching node; connects to inductor and Schottky anode; requires tight layout to reduce EMI and ringing |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode™ operation | Reduces gate charge losses at light loads, enabling 160µA quiescent current and extending battery life in portable instruments |
| Internal 0.3Ω P-channel switch (at 10V) | Eliminates external high-side FET and driver, reducing BOM count and PCB area in space-constrained 5V step-down designs |
| Low-battery detector with open-drain output | Provides system-level battery monitoring without external comparators or pull-ups beyond basic divider network |
| 100% duty cycle low-dropout operation | Maintains regulation down to VIN ≈ VOUT, maximizing usable battery voltage range in single-cell Li-ion or multi-cell alkaline systems |
| Current-mode control with programmable sense threshold | Enables accurate overcurrent protection and consistent peak inductor current across varying input/output conditions |
| Constant off-time architecture | Delivers stable transient response and inherent line/load regulation without loop compensation components |
Applications
| Portable Medical Monitors | Industrial Handheld Scanners |
|---|---|
|
Use Scenario: Battery-powered ECG monitor requiring stable 5V rail for analog front-end and microcontroller during intermittent wireless transmission. IC Role / Device Role / Timing Role: Primary 5V step-down regulator managing power conversion, load transient response, and battery end-of-life signaling. Use Value: 95% efficiency at 500mA extends runtime; 160µA sleep current preserves battery during idle; LBOUT pin triggers firmware alert before brownout. |
Use Scenario: Rugged barcode scanner operating from 2xAA or Li-ion battery, needing robust 5V supply under variable motor and RF load pulses. IC Role / Device Role / Timing Role: High-efficiency DC/DC converter delivering regulated 5V while rejecting input ripple and supporting burst-mode low-power standby. Use Value: Internal 0.3Ω switch handles 1.2A peaks without thermal derating; CT-based frequency scaling prevents audible noise near dropout. |
| Wireless Sensor Node Power | Memory Backup Supply |
|
Use Scenario: LoRaWAN endpoint powered by primary lithium thionyl chloride cell, requiring ultra-low IQ and reliable start-up at cold temperatures. IC Role / Device Role / Timing Role: Micropower step-down regulator enabling long-term operation with periodic sensor wake-up and radio transmission bursts. Use Value: 5µA shutdown current minimizes self-discharge; –40°C to +85°C rating ensures field reliability; fixed 5V eliminates calibration drift from resistor tolerances. |
Use Scenario: SRAM backup circuit in industrial PLC retaining configuration during main power loss, using supercapacitor or coin cell. IC Role / Device Role / Timing Role: Low-noise, low-quiescent 5V regulator maintaining memory voltage during brownout transitions and battery switchover. Use Value: 100% duty cycle operation sustains VOUT down to 4.9V input; 50mVP-P Burst Mode ripple avoids false memory write errors. |
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#TRMPBF | Fixed 5V output, 1.25A, 1.2MHz constant-frequency PWM (not Burst Mode), higher IQ (1.1mA active) | Better EMI control in noise-sensitive environments; less suitable for ultra-low-power battery standby | Select when predictable switching frequency and lower output ripple outweigh quiescent current requirements |
| TPS62130ARGTR | Fixed 5V output, 3A, 2.5MHz synchronous buck, 17µA IQ, no integrated low-battery detector | Higher current capability and smaller external components; lacks LBOUT/LBIN functionality | Select when >1.2A load or footprint reduction is critical, and battery monitoring is handled externally |
Compared with LT1935ES5#TRMPBF and TPS62130ARGTR, the LTC1265IS#TRPBF uniquely combines micropower Burst Mode operation, integrated low-battery detection, and rugged 1.2A capability in a mature SO-14 package-making it optimal for cost-sensitive, battery-limited industrial and portable designs where feature integration trumps raw efficiency or frequency control.
Availability
LTC1265IS#TRPBF is available at Aetrix Electronics and suitable for portable medical monitors, industrial handheld scanners, wireless sensor nodes, memory backup supplies, and battery-powered instrumentation requiring stable component supply, long-lifecycle support, and guaranteed industrial temperature grading.
Supply support for LTC1265IS#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 engineering for legacy Linear parts including the LTC series.
The LTC1265IS#TRPBF belongs to Linear's precision power management portfolio, designed specifically for high-efficiency, low-IQ DC/DC conversion in battery-critical portable and industrial systems where integration, reliability, and extended temperature operation are essential.
FAQ
What is the output voltage tolerance of the LTC1265IS#TRPBF?
The LTC1265IS#TRPBF is the fixed 5V version (LTC1265-5) with output voltage specified as 4.9V to 5.2V (±2%) over full load (10mA–800mA) and temperature (–40°C to +85°C). This tolerance is guaranteed by internal laser-trimmed resistive divider and does not require external components. The LTC1265IS#TRPBF maintains regulation even at 100% duty cycle when input drops near 5V.
Does the LTC1265IS#TRPBF require an external feedback resistor network?
No. The LTC1265IS#TRPBF is the fixed 5V variant (LTC1265-5) and uses an internal resistive divider connected to SENSE– (Pin 7) to set output voltage. Pin 9 (VFB) is no-connect. External resistors are only required for the adjustable-output LTC1265 variant. This simplifies layout and eliminates resistor tolerance-induced output error in the LTC1265IS#TRPBF.
How does the low-battery detection function on the LTC1265IS#TRPBF?
The LTC1265IS#TRPBF uses LBIN (Pin 4) as the inverting input to an internal 1.25V reference comparator. When the voltage at LBIN falls below 1.25V ±100mV, LBOUT (Pin 3) pulls low (open-drain). An external resistor divider from VIN to GND sets the trip point (e.g., 1.25 × (1 + R4/R3)). During shutdown, LBOUT goes high-impedance. This function is fully integrated - no external comparator or reference needed for the LTC1265IS#TRPBF.
What is the maximum recommended operating frequency for the LTC1265IS#TRPBF?
The LTC1265IS#TRPBF operates up to ~700kHz under typical conditions (e.g., VIN = 9V, VOUT = 5V, CT = 130pF), but its constant off-time architecture causes frequency to decrease as (VIN – VOUT) shrinks. At VIN = 6V, frequency drops to ~400kHz; near dropout (VIN ≈ 5.2V), it falls further to avoid audible noise. The LTC1265IS#TRPBF does not specify a hard upper limit - instead, efficiency degrades above ~600kHz due to increased gate charge losses.
Can the LTC1265IS#TRPBF be used in synchronous rectification configurations?
No. The LTC1265IS#TRPBF integrates only a P-channel high-side MOSFET switch and requires an external Schottky catch diode (e.g., MBRS130LT3) connected between SW (Pin 14) and PGND (Pin 12). It does not provide gate drive signals for a synchronous low-side FET. Synchronous operation would require replacing the diode with an actively controlled N-channel MOSFET and adding external timing/control - which is unsupported by the LTC1265IS#TRPBF's pinout and internal architecture.
LTC1265IS#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:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4V
- Voltage - Input (Max):
- 13V
- Voltage - Output (Min/Fixed):
- 1.25V
- Voltage - Output (Max):
- 13V
- Current - Output:
- 1.2A (Switch)
- Frequency - Switching:
- Up to 700kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SO
LTC1265IS#TRPBF FAQ
1.How can I place an order for LTC1265IS#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1265IS#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 LTC1265IS#TRPBF reliable?
The price and inventory of LTC1265IS#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1265IS#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1265IS#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1265IS#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1265IS#TRPBF?
LTC1265IS#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1265IS#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 LTC1265IS#TRPBF?
For technical support, including LTC1265IS#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1265IS#TRPBF requirements.
6.How does Aetrix verify that LTC1265IS#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1265IS#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 LTC1265IS#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1265IS#TRPBF?
All LTC1265IS#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1265IS#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 LTC1265IS#TRPBF part is unused and in its original packaging.
Return procedure for LTC1265IS#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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