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Analog Devices Inc. LTC1265CS-5#PBF
- Part No.:
- LTC1265CS-5#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1265CS-5#PBF.pdf
- Description:
- IC REG BUCK BOOST 5V 1.2A 14SO
- Quantity:
- Payment:
- Shipping:
Inventory:2,253
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Product details
Overview
LTC1265CS-5#PBF from Analog Devices (formerly Linear Technology) is a monolithic step-down DC/DC converter IC with integrated 0.3Ω P-channel MOSFET switch, delivering up to 1.2A output current at fixed 5V output, operating from 5.4V to 12V input, and achieving up to 95% efficiency in continuous mode. It implements current-mode control with Burst Mode™ operation for ultra-low quiescent current (160µA) at light loads and supports low-dropout operation via 100% duty cycle.
For engineers reviewing the LTC1265CS-5#PBF datasheet, LTC1265CS-5#PBF pinout, LTC1265CS-5#PBF application, or LTC1265CS-5#PBF equivalent, key selection considerations include its fixed 5V output configuration, 14-pin SO package, internal voltage divider for VOUT regulation, CT-controlled off-time architecture, and low-battery detection capability via dedicated LBIN/LBOUT pins.
Technical Context
The LTC1265CS-5#PBF uses 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. Its internal resistive divider fixes VOUT = 5V by connecting SENSE– (Pin 7) to an internal 1.25V reference, eliminating need for external feedback resistors.
Control logic integrates a voltage comparator for Burst Mode hysteresis and a gain block for continuous-mode regulation; peak inductor current is programmable via RSENSE (25mV–150mV threshold), and short-circuit protection extends off-time to limit average fault current. The device features active-high micropower shutdown (IQ < 15µA), low-battery comparator (trip at 1.25V ±0.1V), and separate SGND/PGND pins for noise isolation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0V ±2% (guaranteed over 10mA–800mA load, full temp range) |
| Input Voltage Range | 5.4V to 12V (absolute max: –0.3V to 13V) |
| Max Output Current | 1.2A continuous (peak switch current: 1.6A) |
| Switch ON Resistance | 0.3Ω typical at VIN = 10V, TJ = 25°C (increases with temperature) |
| Quiescent Current | 160µA in Burst Mode sleep; 5µA in shutdown |
| Efficiency | Up to 95% at VIN = 12V, IOUT = 800mA, VOUT = 5V |
| Low-Battery Threshold | 1.25V ±0.1V (programmable via external divider on LBIN) |
| Operating Frequency | Variable (≈200–700kHz), set by CT and (VIN – VOUT) |
Pinout & Package
Package: 14-lead plastic SO (Small Outline), 150 mil width, θJA = 110°C/W, rated for 0°C to 70°C ambient (C-grade).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PWR VIN (Pins 1, 13) | Power MOSFET supply rail | Must be tied together and decoupled locally to PGND; supplies gate driver and high-side switch |
| VIN (Pin 2) | Main control circuit supply | Provides bias for internal logic, comparators, and reference; separate from PWR VIN |
| LBOUT (Pin 3) | Open-drain low-battery alert | Sinks current when LBIN < 1.25V; high-impedance in shutdown |
| LBIN (Pin 4) | Inverting input of low-battery comparator | Connected to external resistor divider sensing input voltage; referenced to 1.25V internal reference |
| CT (Pin 5) | Off-time timing capacitor node | External capacitor sets switch off-time; discharge current scales with VOUT |
| ITH (Pin 6) | Current comparator threshold control | Voltage here sets trip point for SENSE+ vs SENSE–; used internally for load-tracking |
| SENSE– (Pin 7) | Current sense reference / VOUT divider tap | Internally connected to fixed resistive divider for 5V regulation; also serves as (–) input for current comparator |
| SENSE+ (Pin 8) | Current sense signal input | (+) input of current comparator; voltage across RSENSE develops between Pins 7 and 8 |
| N/C (Pin 9) | No connect (VFB unused) | Not bonded/internal; reserved for adjustable version (LTC1265); must be left unconnected |
| SHDN (Pin 10) | Active-high shutdown enable | Logic HIGH (>1.2V) disables switch and reduces IQ to <15µA; must not float |
| SGND (Pin 11) | Small-signal ground reference | Return for feedback, reference, and comparator circuits; routed separately to COUT (–) |
| PGND (Pin 12) | Power ground return | Return for PWR VIN, CIN (–), and Schottky diode anode; high-current path |
| SW (Pin 14) | Switch node / P-MOSFET drain | Connects to Schottky cathode and inductor; voltage swings from ~0V to VIN |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode™ operation | Reduces quiescent current to 160µA at light loads while maintaining regulation via hysteretic voltage control |
| Integrated 0.3Ω P-channel MOSFET | Enables 1.2A output without external switch; eliminates gate drive complexity and layout sensitivity |
| Fixed 5V output configuration | Internal resistive divider on SENSE– eliminates external feedback components and improves stability |
| Low-battery detection with open-drain output | Allows system-level battery monitoring and graceful shutdown before critical voltage collapse |
| Separate SGND and PGND pins | Prevents noise coupling from high-current switching paths into sensitive analog control circuitry |
| 100% duty cycle low-dropout operation | Maintains regulation down to VIN ≈ VOUT by holding P-MOSFET fully on, extending battery life |
Applications
| Portable Medical Devices | Industrial Sensor Nodes |
|---|---|
Use Scenario: Battery-powered handheld glucose meters requiring stable 5V rail for microcontroller, display, and analog front-end under varying battery voltage (6–12V). IC Role / Device Role / Timing Role: Primary step-down regulator providing regulated 5V output with Burst Mode™ to extend alkaline battery life beyond 12 months. Use Value: 160µA sleep current and 5µA shutdown current minimize self-discharge; fixed 5V eliminates calibration drift from external resistor tolerances. |
Use Scenario: Wireless vibration sensor node powered by Li-ion battery (8.4V fully charged, 6V nominal), transmitting data via BLE at intermittent intervals. IC Role / Device Role / Timing Role: Efficient power conversion stage supplying 5V to MCU and RF transceiver, with LBOUT signaling low battery to trigger firmware warning. Use Value: Up to 95% efficiency at 800mA reduces thermal stress in sealed enclosure; CT-based frequency scaling avoids audible noise near dropout. |
| Point-of-Sale Terminals | Test & Measurement Accessories |
Use Scenario: Compact barcode scanner using 4xAA batteries (6V fresh, dropping to 4.5V), needing clean 5V for CMOS image sensor and USB interface. IC Role / Device Role / Timing Role: Main DC/DC converter enabling operation down to 4.5V input via 100% duty cycle dropout mode. Use Value: Low dropout behavior maximizes usable battery capacity; integrated switch eliminates external FET footprint and BOM cost. |
Use Scenario: Portable oscilloscope probe amplifier module powered from USB (5V) or external 9V battery, requiring isolated 5V rail for analog signal conditioning. IC Role / Device Role / Timing Role: Step-down regulator converting 9V battery to precise 5V, rejecting noise from shared USB ground via separate SGND/PGND routing. Use Value: Separate ground pins reduce measurement offset errors; 25mV current-sense threshold enables accurate current limiting with 0.1Ω RSENSE. |
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), 500µA quiescent current | Lacks low-battery detection and 100% duty cycle dropout; higher IQ limits battery runtime | Preferred when EMI-sensitive environments require fixed-frequency operation and higher switching speed is needed |
| TPS62130ARGTR | Fixed 5V output, 3A, 2.5MHz synchronous buck, 17µA IQ in DCM, no low-battery comparator | Higher current rating and integrated synchronous rectification improve efficiency above 500mA but add complexity | Chosen when >1.2A output or >90% efficiency at full load is required; requires redesign for synchronous layout |
Compared with LT1935ES5#TRMPBF and TPS62130ARGTR, the LTC1265CS-5#PBF offers unique value in ultra-low-light-load efficiency via Burst Mode™, integrated low-battery alert, and true low-dropout operation-making it optimal for long-life battery systems where intermittent load profiles dominate.
Availability
LTC1265CS-5#PBF is available at Aetrix Electronics and suitable for portable medical devices, industrial sensor nodes, point-of-sale terminals, and test & measurement accessories requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for LTC1265CS-5#PBF 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. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision instrumentation, industrial automation, and power management markets.
The LTC1265CS-5#PBF belongs to Linear's legacy high-efficiency DC/DC converter product line, designed specifically for battery-powered systems demanding micropower operation, robust transient response, and integrated protection features without external complexity.
FAQ
What is the output voltage tolerance of the LTC1265CS-5#PBF over temperature and load?
The LTC1265CS-5#PBF guarantees a 5V output with ±2% tolerance (4.9V to 5.2V) across 10mA to 800mA load and full operating temperature range (0°C to 70°C). This is achieved via an internal precision 1.25V reference and matched resistive divider on SENSE–, eliminating external resistor drift effects. At 25°C and 800mA load, typical VOUT is 5.00V ±0.05V. The LTC1265CS-5#PBF does not require external feedback components to maintain this accuracy.
Does the LTC1265CS-5#PBF support true low-dropout operation, and how is it implemented?
Yes, the LTC1265CS-5#PBF supports true low-dropout operation via 100% duty cycle mode: when VIN approaches VOUT, the internal P-channel MOSFET remains continuously on, allowing VOUT ≅ VIN – IOUT × RON. With RON = 0.3Ω typical, dropout voltage is just 360mV at 1.2A. This behavior is automatic and requires no external control. The LTC1265CS-5#PBF maintains regulation down to VIN ≈ VOUT + IOUT × RON, extending usable battery life significantly compared to fixed-frequency converters.
How does Burst Mode™ operation reduce power consumption in the LTC1265CS-5#PBF?
Burst Mode™ in the LTC1265CS-5#PBF disables the switching regulator core during light loads, reducing input supply current from ~2.4mA (active mode) to 160µA (sleep mode). It operates by allowing VOUT to rise slightly above regulation, triggering a hysteretic comparator that shuts off the switch until VOUT drops below the lower threshold. During sleep, only the reference and comparator remain active. The LTC1265CS-5#PBF enters this mode automatically below ~25mA load, making it ideal for standby or intermittent-use applications.
Can the LTC1265CS-5#PBF be used with an input voltage below 5.4V?
No - the LTC1265CS-5#PBF has a minimum specified input voltage of 5.4V per datasheet Absolute Maximum Ratings and Electrical Characteristics tables. Operation below 5.4V may result in failure to start, unstable regulation, or violation of the 1.25V internal reference specification. While the device can sustain 100% duty cycle down to VIN ≈ VOUT + IOUT × RON (e.g., ~5.36V at 1.2A), startup and reliable Burst Mode™ entry require ≥5.4V. For sub-5.4V inputs, consider the LTC1265-3.3 or other low-VIN regulators. The LTC1265CS-5#PBF is not characterized or guaranteed below 5.4V.
What is the purpose of the separate SGND and PGND pins on the LTC1265CS-5#PBF?
The LTC1265CS-5#PBF separates small-signal ground (SGND, Pin 11) from power ground (PGND, Pin 12) to prevent high di/dt switching currents from injecting noise into sensitive analog circuits (reference, comparators, feedback). SGND returns to COUT (–) and carries only low-current signals; PGND handles high pulsed currents from CIN (–), Schottky anode, and PWR VIN. Routing them separately - with SGND tied to COUT (–) and PGND to CIN (–) - ensures stable 1.25V reference and accurate current sensing. This separation is critical for achieving specified load/line regulation and low-output-ripple performance in the LTC1265CS-5#PBF.
LTC1265CS-5#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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):
- 5V
- 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-5#PBF FAQ
1.How can I place an order for LTC1265CS-5#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1265CS-5#PBF 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-5#PBF reliable?
The price and inventory of LTC1265CS-5#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1265CS-5#PBF is usually 5 days.
3.What payment methods are accepted for LTC1265CS-5#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1265CS-5#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1265CS-5#PBF?
LTC1265CS-5#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1265CS-5#PBF 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-5#PBF?
For technical support, including LTC1265CS-5#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1265CS-5#PBF requirements.
6.How does Aetrix verify that LTC1265CS-5#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1265CS-5#PBF 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-5#PBF meets industry standards.
7.What is the process for return or replacement of LTC1265CS-5#PBF?
All LTC1265CS-5#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1265CS-5#PBF, 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-5#PBF part is unused and in its original packaging.
Return procedure for LTC1265CS-5#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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