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Analog Devices Inc. LT1316CS8#PBF
- Part No.:
- LT1316CS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1316CS8#PBF.pdf
- Description:
- IC REG BST FLYBACK ADJ 750MA 8SO
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LT1316CS8#PBF from Analog Devices (formerly Linear Technology) is a micropower step-up DC/DC converter with programmable peak switch current limit, operating from as low as 1.5V input. It delivers up to 500mA peak switch current (set via external RSET), achieves 33µA quiescent current in active mode and 3µA in shutdown, and integrates an always-active low-battery detector (LBI/LBO). It is widely used in battery-powered LCD bias and low-power –48V-to-5V conversion.
For engineers reviewing the LT1316CS8#PBF datasheet, LT1316CS8#PBF pinout, LT1316CS8#PBF application, or LT1316CS8#PBF equivalent, key selection criteria include its 8-lead SO package, 1.5V minimum VIN, programmable 30–500mA peak current, fixed off-time regulation, and dual-mode operation (continuous/discontinuous conduction) across industrial temperature range.
Technical Context
The LT1316CS8#PBF employs a fixed off-time, variable on-time PWM control architecture that enables ultra-low quiescent current (33µA active, 3µA shutdown) while maintaining precise output regulation via a 1.23V feedback reference. Its internal NPN power transistor features low VCE(SAT) (300mV at 500mA), enabling high efficiency even at low input voltages.
Peak switch current is set externally via a resistor from RSET to GND (3kΩ–150kΩ), allowing accurate current limiting between 30mA and 500mA. The integrated low-battery detector operates independently of the main converter-remaining fully functional during shutdown-with 1.17V threshold, 35mV hysteresis, and open-collector LBO output capable of sinking 500µA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 1.5V to 12V - supports single- or dual-cell alkaline, NiMH, or lithium coin cell inputs without external regulators. |
| Quiescent Current | 33µA (active), 3µA (shutdown) - enables multi-year battery life in standby-critical applications like remote sensors. |
| Peak Switch Current | Programmable 30–500mA via RSET resistor - allows optimization for source impedance (e.g., 200mA for Li coin cells, 500mA for low-Z supplies). |
| Feedback Reference | 1.23V ±2% - sets output voltage via resistive divider (VOUT = 1.23V × (1 + R1/R2)), enabling stable 5V, 12V, or negative outputs. |
| Switch Saturation Voltage | 300mV at 500mA - minimizes conduction loss and improves efficiency in high-current boost stages. |
| Low-Battery Threshold | 1.17V falling-edge trip with 35mV hysteresis - provides reliable battery end-of-life detection without oscillation near cutoff. |
| Package | 8-lead SO (Small Outline, narrow 0.150") - industry-standard footprint compatible with automated assembly and thermal management (θJA = 120°C/W). |
Pinout & Package
LT1316CS8#PBF is housed in an 8-lead plastic SO package (S8), with exposed pad not connected. Pin 1 is marked by a beveled corner or dot; top view orientation follows standard SO convention.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| LBO (Pin 1) | Open-collector low-battery output | Sinks up to 500µA when LBI falls below 1.17V; remains active in shutdown for system-level battery monitoring. |
| LBI (Pin 2) | Low-battery detector input | High-impedance node (≤20nA bias); connects to voltage divider from VIN to monitor battery health. |
| RSET (Pin 3) | Peak current programming input | High-impedance node (0.5V regulated); resistor to GND sets peak switch current (30–500mA); trace must be short and unshielded. |
| GND (Pin 4) | Analog and power ground | Primary return path for FB, LBI, RSET, and internal circuitry; requires direct connection to low-impedance ground plane. |
| SW (Pin 5) | Collector of internal NPN switch | High-slew, high-current node (750mA max); connects to inductor and Schottky diode; layout critical for EMI and efficiency. |
| VIN (Pin 6) | Main input supply | Accepts 1.5–12V; requires local 47µF tantalum or 1µF ceramic bypass capacitor placed adjacent to pin. |
| SHDN (Pin 7) | Logic-level shutdown control | Active-low input (≤0.4V = shutdown, ≥1.4V = enable); draws ≤5µA; enables system-level power sequencing. |
| FB (Pin 8) | Feedback input | Connects to resistive divider tap; 1.23V reference enables precise output regulation; sensitive to noise-minimize trace area. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable Peak Current Limit | Set precisely from 30mA to 500mA using one external resistor-enables optimal trade-off between inductor size, efficiency, and source impedance matching. |
| Ultra-Low Quiescent Current | 33µA active / 3µA shutdown-extends battery life in intermittent-use devices such as portable medical monitors and wireless sensors. |
| Integrated Low-Battery Detector | Independent 1.17V comparator with 35mV hysteresis and open-collector LBO output-provides fail-safe battery monitoring without external components. |
| Fixed Off-Time Regulation | 2µs nominal off-time with variable on-time-ensures stable operation across wide input/output ratios and load transients. |
| Low VCE(SAT) Power Switch | 300mV at 500mA-reduces conduction losses and thermal stress, especially critical in compact, unventilated enclosures. |
Applications
| Battery Backup | LCD Bias |
|---|---|
Use Scenario: Maintaining real-time clock or SRAM state during main power failure using supercapacitor or backup coin cell. IC Role / Device Role / Timing Role: Step-up regulator generating stable 3.3V or 5V from depleted 1.8–2.5V backup source. Use Value: 3µA shutdown current preserves backup energy for >1 year; programmable current limit prevents over-stressing low-capacity cells. | Use Scenario: Generating ±15V to ±30V for segment driving in monochrome or grayscale LCD modules. IC Role / Device Role / Timing Role: High-efficiency flyback or inverting boost converter powering LCD VEE/VPOS rails. Use Value: 1.5V start-up enables direct use of 2-cell alkaline/NiMH; low VCE(SAT) sustains >80% efficiency at 5–10mA loads. |
| Low-Power –48V to 5V Conversion | Solenoid Driver |
Use Scenario: Telecom line-card power conversion where –48V DC is available but +5V logic rails are required. IC Role / Device Role / Timing Role: Non-isolated flyback controller driving external NPN transistor to generate isolated 5V output. Use Value: Programmable current limit protects primary-side switch under short-circuit; LBO monitors –48V rail integrity. | Use Scenario: Driving 12V/24V solenoids from 2-cell battery packs in portable access control or fluid control systems. IC Role / Device Role / Timing Role: Controlled-energy pulse generator delivering precise 500mA–1A peak to solenoid coil. Use Value: RSET-programmed current limit avoids battery sag and extends cycle life; shutdown pin enables microcontroller-gated activation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-up DC/DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1307CS8#PBF | 600kHz fixed-frequency PWM; no RSET current programming; 75mA max output; 1.5V min VIN. | Lower output current capability; better suited for ultra-low-noise, low-power sensor bias than high-current solenoid drive. | Select LT1307CS8#PBF only when fixed frequency and lower peak current (<100mA) are acceptable and RSET flexibility is unnecessary. |
| MAX756CSA+ | 200kHz fixed-frequency; 300mA max switch current; no integrated LBI/LBO; 0.9V min VIN. | Lacks battery monitoring; requires external undervoltage lockout; higher quiescent current (120µA active). | Choose MAX756CSA+ only if sub-1V start-up is mandatory and low-battery detection is handled elsewhere in the system. |
Compared with LT1307CS8#PBF and MAX756CSA+, the LT1316CS8#PBF uniquely combines programmable current limiting, integrated low-battery detection, and ultra-low shutdown current-making it optimal for battery-critical, high-reliability applications where both energy efficiency and system health monitoring are essential.
Availability
LT1316CS8#PBF is available at Aetrix Electronics and suitable for battery backup, LCD bias, low-power –48V-to-5V converters, solenoid drivers, and supercapacitor backup supplies requiring stable component supply and long-term manufacturability.
Supply support for LT1316CS8#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 acquired Linear Technology in 2017 and maintains full product support, datasheet documentation, and long-term supply commitment for legacy Linear parts.
The LT1316CS8#PBF belongs to Linear's micropower DC/DC converter family, designed specifically for energy-constrained applications where extended battery life, low-voltage operation, and integrated system monitoring (e.g., battery health) are critical design requirements.
FAQ
What is the minimum input voltage required for LT1316CS8#PBF to operate?
The LT1316CS8#PBF operates with a minimum input voltage of 1.5V, verified across the commercial temperature range (0°C to 70°C). This enables direct use with two alkaline, NiMH, or lithium coin cells-even as they discharge below 1.6V. The device maintains regulation down to this threshold, and the integrated low-battery detector remains active below 1.5V (down to ~1.4V) to signal end-of-life.
How is peak switch current programmed on the LT1316CS8#PBF?
Peak switch current on the LT1316CS8#PBF is programmed by connecting a resistor (RSET) between Pin 3 (RSET) and GND. Resistor values from 3kΩ to 150kΩ set peak current from ~500mA down to ~30mA, per the published RSET vs. current graph. For example, a 10kΩ resistor yields ~290mA typical peak current at 25°C. Layout best practice requires keeping the RSET trace short and free of capacitance.
Does the LT1316CS8#PBF remain functional in shutdown mode?
Yes-the LT1316CS8#PBF retains full functionality of its low-battery detector (LBI/LBO) in shutdown mode. When SHDN is pulled low, the main switching regulator disables, reducing quiescent current to 3µA, but the LBI comparator continues monitoring input voltage and drives LBO low when VIN drops below 1.17V. This allows continuous battery health monitoring without waking the main system.
What package type does the LT1316CS8#PBF use, and is it RoHS compliant?
The LT1316CS8#PBF uses an 8-lead plastic Small Outline (SO) package, narrow body (0.150"), with JEDEC MS-012AC dimensions. It is RoHS compliant and lead-free, as indicated by the "#PBF" suffix per Analog Devices' part numbering convention. Thermal resistance is θJA = 120°C/W, and the package is rated for reflow soldering per J-STD-020.
Can the LT1316CS8#PBF generate negative output voltages?
Yes-the LT1316CS8#PBF can generate negative outputs using inverting boost (flyback or Ćuk) topologies. Application Note 1316 TA06 demonstrates a positive-to-negative converter for LCD bias, producing –20V at 6mA from two cells. The FB pin regulates based on the absolute value of the feedback divider ratio, so proper polarity referencing and diode selection (e.g., MBR0530L) are essential for stable negative regulation.
LT1316CS8#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Step-Up, Step-Up/Step-Down
- Output Configuration:
- Positive or Negative
- Topology:
- Boost, Flyback
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 1.5V
- Voltage - Input (Max):
- 12V
- Voltage - Output (Min/Fixed):
- 1.23V
- Voltage - Output (Max):
- 30V (Switch)
- Current - Output:
- 750mA (Switch)
- Frequency - Switching:
- -
- Synchronous Rectifier:
- No
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LT1316CS8#PBF FAQ
1.How can I place an order for LT1316CS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1316CS8#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 LT1316CS8#PBF reliable?
The price and inventory of LT1316CS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1316CS8#PBF is usually 5 days.
3.What payment methods are accepted for LT1316CS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1316CS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1316CS8#PBF?
LT1316CS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1316CS8#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 LT1316CS8#PBF?
For technical support, including LT1316CS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1316CS8#PBF requirements.
6.How does Aetrix verify that LT1316CS8#PBF is sourced from the original manufacturer or authorized distributors?
All LT1316CS8#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 LT1316CS8#PBF meets industry standards.
7.What is the process for return or replacement of LT1316CS8#PBF?
All LT1316CS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1316CS8#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 LT1316CS8#PBF part is unused and in its original packaging.
Return procedure for LT1316CS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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