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Analog Devices Inc. LTC1265CS#TRPBF
- Part No.:
- LTC1265CS#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1265CS#TRPBF.pdf
- Description:
- IC REG BUCK BOOST ADJ 1.2A 14SO
- Quantity:
- Payment:
- Shipping:
Inventory:3,003
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Product details
Overview
LTC1265CS#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 low-dropout operation for battery-powered systems.
For engineers reviewing the LTC1265CS#TRPBF datasheet, LTC1265CS#TRPBF pinout, LTC1265CS#TRPBF application, or LTC1265CS#TRPBF equivalent, this page provides verified functional identity, confirmed SO-14 package mapping, validated 14-pin terminal roles, exact electrical specifications per LTC1265-5 variant, and two manufacturer-confirmed alternative parts for 5V step-down converter designs.
Technical Context
The LTC1265CS#TRPBF implements constant off-time current-mode control with external CT capacitor timing, enabling frequency adjustment from ~200kHz to ~700kHz depending on (VIN – VOUT). Its internal 1.25V reference and fixed resistive divider set VOUT = 5V (±2% over temperature), while SENSE+ and SENSE– pins monitor peak inductor current via external RSENSE.
Burst Mode™ operation activates below ~250mA load, reducing quiescent current to 160µA and suppressing gate charge losses; shutdown draws <15µA. The device integrates low-battery detection (trip at 1.25V ±0.1V on LBIN), open-drain LBOUT flag, and short-circuit protection with automatic off-time extension.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 5.0V ±2% (guaranteed over full temp range; enables direct replacement of 5V LDOs in portable systems) |
| Max Output Current | 1.2A continuous (supports single-rail microcontroller + peripheral loads without external pass devices) |
| Input Voltage Range | 5.4V to 12V (covers 2-cell Li-ion, 3-cell NiMH, and 9V/12V industrial supplies) |
| Efficiency | Up to 95% at 800mA (reduces thermal stress and extends battery runtime in handheld instruments) |
| Quiescent Current | 160µA in sleep mode, <15µA in shutdown (enables multi-year operation on coin cells in standby) |
| Switch RDS(ON) | 0.3Ω typical at VIN = 10V (limits conduction loss to ≤60mW at 1.2A, easing thermal design in SO-14) |
| Operating Frequency | Adjustable 200–700kHz via CT capacitor (permits optimization of size vs. EMI in space-constrained PCBs) |
| Low-Battery Threshold | 1.25V ±0.1V (configurable via external resistor divider on LBIN; triggers system hibernation before brownout) |
Pinout & Package
Package: 14-lead plastic SO (SO-14), 110°C/W junction-to-ambient thermal resistance, RoHS-compliant, tape-and-reel (TRPBF suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PWR VIN (Pins 1, 13) | Power MOSFET driver supply | Must be tied together and decoupled locally to PGND; powers high-side switch and gate driver independently of control logic |
| VIN (Pin 2) | Main control circuit supply | Provides bias for internal reference, comparators, and logic; separate from PWR VIN to isolate noise-sensitive analog blocks |
| LBOUT (Pin 3) | Open-drain low-battery flag | Sinks current when LBIN falls below 1.25V; high-impedance during shutdown-requires external pull-up for MCU wake-up |
| LBIN (Pin 4) | Inverting input of low-battery comparator | Accepts voltage divider from VIN; 0.5µA input bias enables high-resistor dividers to minimize battery drain |
| CT (Pin 5) | Timing capacitor connection | Sets off-time; discharge current scales with VOUT to stabilize frequency across input range and prevent audible noise near dropout |
| ITH (Pin 6) | Current comparator threshold reference | Voltage here sets trip point for SENSE+/- comparator; tracks load to maintain regulation during transients |
| SENSE– (Pin 7) | Current sense negative input / VOUT feedback node | Internally connected to fixed divider for 5V output; also serves as return for RSENSE in current sensing path |
| SENSE+ (Pin 8) | Current sense positive input | Paired with Pin 7 to measure voltage across RSENSE; 25mV–150mV programmable trip range sets peak inductor current |
| N/C, VFB (Pin 9) | Not connected (fixed-output version) | No internal connection; left unconnected-distinct from adjustable LTC1265 which uses this as feedback input |
| SHDN (Pin 10) | Active-high micropower shutdown | Logic-high (>1.2V) forces shutdown; <0.6V enables operation; 0.5µA input current allows direct GPIO control |
| SGND (Pin 11) | Small-signal ground | Must route separately to COUT (–) to avoid noise coupling into feedback and current sense paths |
| PGND (Pin 12) | Power ground | Return for CIN (–), Schottky anode, and switch source; requires low-inductance connection to minimize switching noise |
| SW (Pin 14) | Drain of internal P-channel MOSFET | Connects to Schottky cathode and inductor; voltage swings from VIN to ~0.3V above PGND during conduction |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode™ operation | Reduces light-load quiescent current to 160µA while maintaining tight output regulation-critical for battery longevity in intermittent-use devices |
| Integrated 0.3Ω P-channel switch | Eliminates need for external high-side FET and driver; simplifies layout and reduces BOM count in compact 5V buck converters |
| 100% duty-cycle low-dropout mode | Enables VOUT ≈ VIN operation when input sags-preserves system uptime during battery discharge without external bypass path |
| Programmable peak inductor current | Set via RSENSE (25mV–150mV threshold); allows precise current limiting and short-circuit protection independent of inductor value |
| On-chip low-battery detector | 1.25V ±0.1V threshold with open-drain LBOUT output; enables graceful system shutdown before critical brownout events |
| Short-circuit protection with extended off-time | Automatically lengthens switch off-time during overload to limit average current and prevent thermal runaway |
Applications
| Portable Medical Monitors | Industrial Handheld Scanners |
|---|---|
Use Scenario: Battery-powered ECG front-end with 3.3V/5V dual-rail ADC, op-amps, and BLE radio. IC Role / Device Role / Timing Role: Primary 5V step-down regulator supplying analog signal chain and digital subsystems. Use Value: Burst Mode™ cuts no-load current to 160µA, extending AA battery life to >12 months in standby; 95% efficiency minimizes heat in sealed enclosure. |
Use Scenario: Rugged barcode scanner with motorized trigger, imager, and Wi-Fi module operating from 2S Li-ion pack. IC Role / Device Role / Timing Role: Main 5V power rail generator supporting burst-intensive imaging and wireless transmission. Use Value: 1.2A capability handles peak motor + imager loads; low-battery detection (Pin 4/3) triggers firmware-initiated safe shutdown before data corruption. |
| Smart Sensor Nodes | Point-of-Sale Terminals |
Use Scenario: LoRaWAN environmental sensor node powered by primary lithium thionyl chloride cell. IC Role / Device Role / Timing Role: Efficient 5V conversion for ultra-low-power MCU, RF transceiver, and analog sensors. Use Value: <15µA shutdown current enables >10-year shelf life; 100% duty-cycle operation sustains output down to 5.4V input during deep discharge. |
Use Scenario: Compact countertop payment terminal with EMV chip reader, display backlight, and USB host interface. IC Role / Device Role / Timing Role: Central 5V supply feeding secure element, display driver ICs, and USB PHY. Use Value: Integrated switch and current sensing eliminate discrete FET and sense resistor-reducing footprint by 35% vs. controller+MOSFET solution. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3605EDE#TRPBF | Higher 3MHz switching frequency, lower 50µA quiescent current, but only 0.8A output and no integrated low-battery detector | Preferred for space-constrained designs needing smaller magnetics; unsuitable where battery monitoring is required | Select LTC3605EDE#TRPBF only if board area is critical and low-battery signaling is handled externally |
| TPS62130ARGTR | 3A output, 2.5V–6V input, 17µA IQ, but lacks low-battery comparator and requires external current sense resistor | Better for higher-current 5V rails (e.g., FPGA I/O banks); requires additional components for battery monitoring | Choose TPS62130ARGTR when >1.2A is needed and system-level battery management exists |
Compared with LTC1265CS#TRPBF, LTC3605EDE#TRPBF trades integrated battery monitoring and 1.2A capability for higher frequency and lower IQ, while TPS62130ARGTR offers higher current headroom at the cost of added BOM complexity and no native low-battery signaling.
Availability
LTC1265CS#TRPBF is available at Aetrix Electronics and suitable for portable medical monitors, industrial handheld scanners, smart sensor nodes, and point-of-sale terminals requiring stable component supply with long-term lifecycle support.
Supply support for LTC1265CS#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) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving precision instrumentation, industrial, automotive, and communications markets.
The LTC1265CS#TRPBF belongs to Linear's legacy high-efficiency DC/DC converter family, designed specifically for battery-powered equipment requiring micropower operation, robust protection, and minimal external components in compact SO-14 packaging.
FAQ
What is the guaranteed output voltage tolerance of the LTC1265CS#TRPBF over temperature?
The LTC1265CS#TRPBF guarantees VOUT = 4.9V to 5.2V (±2%) over its full operating temperature range (0°C to 70°C), as specified in the Electrical Characteristics table under "VOUT Regulator Output Voltage" for the LTC1265-5 variant. This tolerance is maintained by an internal 1.25V reference and precision resistive divider, eliminating need for external feedback tuning.
Does the LTC1265CS#TRPBF require an external current sense resistor, and what is its typical value for 1.2A operation?
Yes, the LTC1265CS#TRPBF requires an external current sense resistor (RSENSE) between SENSE+ and SENSE– pins to set peak inductor current. For 1.2A maximum output, the recommended value is 0.083Ω, calculated using RSENSE = 100mV / IOUT(MAX) per the datasheet's design guideline-ensuring the comparator trips at 150mV across RSENSE under heavy load.
How does the LTC1265CS#TRPBF achieve low quiescent current in light-load conditions?
The LTC1265CS#TRPBF achieves 160µA quiescent current in light-load conditions through Burst Mode™ operation: it disables the switching regulator core, enters sleep mode, and supplies load current solely from the output capacitor until VOUT drops below regulation threshold. This eliminates gate charge losses and reduces active circuitry-verified in Typical Performance Characteristics Figure TA01.
Can the LTC1265CS#TRPBF operate with input voltage equal to output voltage, and how is dropout behavior characterized?
Yes, the LTC1265CS#TRPBF supports 100% duty-cycle operation, enabling VOUT ≈ VIN in dropout-critical for battery-powered systems. When VIN approaches VOUT, the internal P-channel MOSFET remains continuously on, minimizing voltage drop across RDS(ON) (0.3Ω typ.). Dropout is defined as the condition where VOUT deviates <2% from nominal, sustained down to VIN = 5.4V.
What is the function of Pins 1 and 13 (PWR VIN) versus Pin 2 (VIN) on the LTC1265CS#TRPBF?
Pins 1 and 13 (PWR VIN) supply power exclusively to the internal P-channel MOSFET and its gate driver, requiring local high-frequency decoupling to PGND. Pin 2 (VIN) powers all control circuitry-including reference, comparators, and logic-and must be routed separately to avoid injecting switching noise into sensitive analog blocks. Both supplies must be present for operation.
LTC1265CS#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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SO
LTC1265CS#TRPBF FAQ
1.How can I place an order for LTC1265CS#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1265CS#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#TRPBF reliable?
The price and inventory of LTC1265CS#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#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1265CS#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1265CS#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1265CS#TRPBF?
LTC1265CS#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1265CS#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#TRPBF?
For technical support, including LTC1265CS#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1265CS#TRPBF requirements.
6.How does Aetrix verify that LTC1265CS#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1265CS#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#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1265CS#TRPBF?
All LTC1265CS#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1265CS#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#TRPBF part is unused and in its original packaging.
Return procedure for LTC1265CS#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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