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Analog Devices Inc. LT1316IS8#PBF
- Part No.:
- LT1316IS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1316IS8#PBF.pdf
- Description:
- IC REG BST FLYBACK ADJ 750MA 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:373
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Product details
Overview
LT1316IS8#PBF from Analog Devices (formerly Linear Technology) is an industrial-grade micropower step-up DC/DC converter optimized for ultra-low-input-voltage operation down to 1.5V, featuring programmable peak switch current (30–500mA), 33µA active quiescent current, and integrated low-battery detector with active shutdown mode. It targets battery-powered instrumentation, LCD bias generation, and isolated -48V-to-5V conversion.
For engineers reviewing the LT1316IS8#PBF datasheet, LT1316IS8#PBF pinout, LT1316IS8#PBF application, or LT1316IS8#PBF equivalent, key selection criteria include its 8-lead SO package, programmable RSET-based current limiting, fixed off-time regulation architecture, and guaranteed –40°C to +85°C industrial temperature range performance.
Technical Context
The LT1316IS8#PBF employs a fixed off-time (2µs), variable on-time PWM control scheme that enables stable regulation with only 33µA quiescent current in active mode and drops to 3µA in shutdown while maintaining LBI/LBO functionality. Its internal NPN power transistor delivers 300mV VCE(SAT) at 500mA, supporting high-efficiency boost conversion from single- or dual-cell sources.
Peak switch current is precisely set via external resistor RSET (3kΩ–150kΩ), enabling tailored current limiting for high-impedance inputs like lithium coin cells or telephone lines. The feedback comparator has a 1.23V reference with ±0.5% tolerance over temperature, and the low-battery detector features 1.17V threshold with 35mV hysteresis and open-collector LBO output sinking up to 500µA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Operating Input Voltage | 1.5V to 12V - supports direct operation from 2-cell alkaline or LiMnO₂ batteries without pre-regulation. |
| Quiescent Current (Active) | 33µA typical - enables multi-year battery life in always-on sensor nodes and backup systems. |
| Quiescent Current (Shutdown) | 3µA typical - maintains low-battery monitoring while minimizing standby drain. |
| Peak Switch Current Range | 30mA to 500mA - programmable via single RSET resistor for precise inductor sizing and surge handling. |
| Feedback Reference Voltage | 1.23V ±1.6% - sets output voltage accuracy via external resistor divider (VOUT = 1.23V × (1 + R1/R2)). |
| Low-Battery Threshold | 1.17V falling edge - triggers LBO output before system brownout, with 35mV hysteresis to prevent chatter. |
| Switch Saturation Voltage | 300mV at 500mA - reduces conduction loss and improves efficiency in high-current boost stages. |
| Temperature Range | –40°C to +85°C - fully specified for industrial environments including metering and remote sensing. |
Pinout & Package
LT1316IS8#PBF is housed in an 8-lead plastic SO (Small Outline) package (S8), 0.150" wide, with standard JEDEC MS-012AC footprint and θJA = 120°C/W. Pin 1 is marked by a beveled corner or dot.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| LBO (Pin 1) | Low-battery detector open-collector output | Sinks up to 500µA when LBI falls below 1.17V; remains active in shutdown for battery monitoring. |
| LBI (Pin 2) | Low-battery detector input | High-impedance node referenced to internal 1.17V comparator; requires no external bias. |
| RSET (Pin 3) | Peak current programming input | Connects to ground via resistor (3kΩ–150kΩ) to set precise peak switch current; avoid capacitance or long traces. |
| GND (Pin 4) | Analog and power ground | Must connect directly to low-impedance ground plane; separates signal and power return paths. |
| SW (Pin 5) | Collector of internal NPN power transistor | High-slew-rate switching node; requires short, wide trace to minimize EMI and voltage spikes. |
| VIN (Pin 6) | Main input supply | Accepts 1.5V–12V; must be bypassed with ≥47µF low-ESR capacitor placed adjacent to pin. |
| SHDN (Pin 7) | Logic-level shutdown control | Ground to enter shutdown (3µA IQ); drive ≥1.4V to enable; compatible with 3.3V/5V logic. |
| FB (Pin 8) | Feedback input for output regulation | Connects to resistor divider tap; 3nA bias current enables high-resistance dividers for low power. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable peak current limit | Settable from 30mA to 500mA using one external resistor - eliminates need for current-sense amplifiers or complex compensation. |
| Micropower operation | 33µA active / 3µA shutdown IQ - extends battery life in portable medical devices and wireless sensors. |
| Integrated low-battery detector | 1.17V threshold with 35mV hysteresis and active LBO in shutdown - enables autonomous battery health monitoring without external circuitry. |
| Low VCE(SAT) switch | 300mV at 500mA - reduces conduction losses and thermal stress in compact, unheatsinked designs. |
| Fixed off-time regulation | 2µs nominal off-time - ensures stable operation across wide input/output ratios and load transients. |
| Industrial temperature grade | –40°C to +85°C guaranteed performance - qualified for deployment in outdoor meters, factory automation, and telecom infrastructure. |
Applications
| Battery Backup Systems | LCD Bias Generation |
|---|---|
|
Use Scenario: Maintaining real-time clock (RTC) or SRAM state during main power failure using supercapacitor or coin cell. IC Role / Device Role / Timing Role: Step-up regulator providing regulated 3.3V or 5V from depleted 1.8V–2.5V backup source. Use Value: 1.5V minimum start-up and 3µA shutdown current enable >10-year hold-up time with 0.1F supercap. |
Use Scenario: Generating ±15V or +28V for segment driving in monochrome or color STN/TN LCD panels. IC Role / Device Role / Timing Role: High-efficiency boost converter with feedforward ripple reduction for clean analog bias rails. Use Value: Programmable current limit allows optimization for low-noise, low-ripple operation (<80mVP-P) with 100pF FB-to-VOUT capacitor. |
| –48V Telecom Power Conversion | Low-Power Solenoid Drivers |
|
Use Scenario: Deriving isolated 5V/3.3V auxiliary power from legacy –48V telecom distribution bus. IC Role / Device Role / Timing Role: Flyback controller with external MOSFET driver and transformer feedback winding. Use Value: Fixed off-time architecture simplifies transformer design; LBI monitoring prevents operation below safe input voltage. |
Use Scenario: Energizing 12V/24V solenoids from 2-cell alkaline or Li-ion packs in portable access control or fluid valves. IC Role / Device Role / Timing Role: Controlled-current boost stage limiting inrush to extend battery life and reduce thermal stress. Use Value: RSET-programmable peak current ensures consistent solenoid pull-in energy independent of battery voltage decay. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar micropower step-up DC/DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1304CS8#PBF | Fixed 200mA peak current; no RSET pin; same 1.5V min VIN and 33µA IQ. | Less flexible for varying inductor/transformer requirements; suited for fixed-output, high-volume designs. | Select LT1304CS8#PBF when current limit is fixed and board space is constrained - eliminates RSET resistor. |
| MAX1706ESA+ | 3.3V/5V fixed-output variants; 25µA IQ; requires external diode; no integrated LBI/LBO. | Lacks battery monitoring; limited to standard output voltages; lower IQ but less feature-rich. | Choose MAX1706ESA+ for cost-sensitive, fixed-VOUT applications where battery detection is handled externally. |
Compared with LT1316IS8#PBF, LT1304CS8#PBF trades programmability for simplicity and smaller BOM count, while MAX1706ESA+ offers lower quiescent current but omits critical battery-monitoring functions required in field-deployed equipment.
Availability
LT1316IS8#PBF is available at Aetrix Electronics and suitable for battery backup systems, LCD bias generation, –48V telecom converters, solenoid drivers, and supercapacitor backup supplies requiring stable component supply across industrial temperature ranges.
Supply support for LT1316IS8#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, qualification, and manufacturing continuity for all Linear-branded power ICs.
The LT1316IS8#PBF belongs to Linear's micropower DC/DC converter family, designed specifically for energy-constrained applications where ultra-low IQ, wide input range, and integrated protection features are essential.
FAQ
What is the minimum input voltage required for LT1316IS8#PBF to start switching?
The LT1316IS8#PBF guarantees operation down to 1.5V input voltage, with typical startup occurring at 1.65V. This enables reliable use with aging alkaline or lithium coin cells whose voltage sags under load. Below 1.5V, the internal oscillator and reference may not stabilize, and regulation ceases. The device does not incorporate undervoltage lockout below this threshold, so external supervision is recommended if VIN may dip below 1.4V.
How do I calculate the RSET resistor value for a desired peak switch current in LT1316IS8#PBF?
To set peak switch current in LT1316IS8#PBF, use Figure 3 ("DC Current Limit vs RSET Resistor") from the datasheet: locate your target current (e.g., 100mA), subtract ~18mA overshoot (due to 300ns transistor turn-off delay), then read RSET ≈ 33kΩ. For precision, apply the formula IPEAK ≈ 0.5V / RSET × (1 + RSET/RINT), though the graph remains the primary design tool. RSET must be between 3kΩ and 150kΩ.
Does LT1316IS8#PBF support discontinuous conduction mode (DCM) operation?
Yes, LT1316IS8#PBF operates reliably in discontinuous conduction mode (DCM), especially at high VOUT/VIN ratios (e.g., 28V from 3.3V) or low peak currents (<50mA). Its fixed off-time architecture naturally transitions into DCM when inductor current reaches zero each cycle. Design equations for DCM - including POUT(MAX) = ½·L·IPEAK²·f - are provided in the datasheet to ensure stability and efficiency.
Can LT1316IS8#PBF be used in a flyback topology with an external MOSFET?
Yes, LT1316IS8#PBF is commonly used in non-isolated and isolated flyback configurations with external MOSFETs. Its SW pin drives the base/gate of an external transistor (e.g., ZVN4424A), while feedback is derived from a secondary winding or optocoupler. The datasheet includes verified designs for –48V-to-5V and 50V-to-6V isolated flybacks, confirming robust gate drive capability and timing compatibility with external power stages.
What is the purpose of the 100pF capacitor from VOUT to FB in LT1316IS8#PBF designs?
The 100pF capacitor from VOUT to FB in LT1316IS8#PBF circuits acts as a feedforward path that reduces output ripple voltage by ~40%, lowering it from ~140mVP-P to <80mVP-P. It compensates for high-frequency switching noise without affecting loop stability, as confirmed in Figures 7 and 8 of the datasheet. This capacitor is optional but recommended for noise-sensitive analog bias rails such as LCD VEE/VCC.
LT1316IS8#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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LT1316IS8#PBF FAQ
1.How can I place an order for LT1316IS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1316IS8#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 LT1316IS8#PBF reliable?
The price and inventory of LT1316IS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1316IS8#PBF is usually 5 days.
3.What payment methods are accepted for LT1316IS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1316IS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1316IS8#PBF?
LT1316IS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1316IS8#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 LT1316IS8#PBF?
For technical support, including LT1316IS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1316IS8#PBF requirements.
6.How does Aetrix verify that LT1316IS8#PBF is sourced from the original manufacturer or authorized distributors?
All LT1316IS8#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 LT1316IS8#PBF meets industry standards.
7.What is the process for return or replacement of LT1316IS8#PBF?
All LT1316IS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1316IS8#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 LT1316IS8#PBF part is unused and in its original packaging.
Return procedure for LT1316IS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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