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Analog Devices Inc. LT1316IS8#TRPBF
- Part No.:
- LT1316IS8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1316IS8#TRPBF.pdf
- Description:
- IC REG BST FLYBACK ADJ 750MA 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:1,779
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Product details
Overview
LT1316IS8#TRPBF from Analog Devices (formerly Linear Technology) is an industrial-grade 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 resistor), achieves 33µA quiescent current in active mode and 3µA in shutdown, and integrates a low-battery detector active during shutdown. It is used in battery-powered LCD bias supplies and low-power –48V-to-5V converters.
For engineers reviewing the LT1316IS8#TRPBF datasheet, LT1316IS8#TRPBF pinout, LT1316IS8#TRPBF application, or LT1316IS8#TRPBF equivalent, key selection criteria include its 1.5V minimum VIN, programmable 30–500mA peak current limit, 8-pin SO package, industrial temperature range (–40°C to +85°C), and integrated low-battery detection with open-collector LBO output.
Technical Context
The LT1316IS8#TRPBF employs a fixed off-time, variable on-time regulation scheme to maintain ultra-low quiescent current. Its internal NPN power transistor features 300mV saturation voltage at 500mA, enabling high efficiency at light loads.
It integrates a precision 1.23V feedback reference, a dedicated low-battery comparator (LBI/LBO) with 1.17V threshold and 35mV hysteresis, and logic-level shutdown control. Peak switch current is set by a single resistor from RSET to GND, supporting precise current limiting across wide input impedance sources like coin cells.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 1.5V to 12V - supports direct operation from 2-cell alkaline or lithium coin cells without pre-regulation. |
| Quiescent Current (Active) | 33µA typical - enables multi-year battery life in always-on sensor nodes or backup systems. |
| Quiescent Current (Shutdown) | 3µA typical - preserves battery charge while maintaining active low-battery monitoring. |
| Peak Switch Current Range | 30mA to 500mA (programmable via RSET) - allows optimization for source impedance and load requirements. |
| Feedback Reference Voltage | 1.23V ±1.6% - sets output voltage accuracy via external resistor divider (VOUT = 1.23V × (1 + R1/R2)). |
| Switch Saturation Voltage | 300mV at 500mA - minimizes conduction loss and improves efficiency in high-current boost stages. |
| Low-Battery Threshold | 1.17V falling edge, 35mV hysteresis - provides reliable undervoltage warning with noise immunity. |
Pinout & Package
LT1316IS8#TRPBF is housed in an 8-lead plastic SO (Small Outline) package, 0.150" narrow body, RoHS-compliant, with θJA = 120°C/W. Pin 1 is marked with a dot or bevel; pin numbering follows standard SO convention (counterclockwise from top-left corner).
| 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 functional in shutdown mode. |
| LBI (Pin 2) | Low-battery detector input | Monitors external voltage; trip point is 1.17V with 35mV hysteresis to prevent chatter near threshold. |
| RSET (Pin 3) | Peak current programming node | Resistor to GND sets peak switch current (30–500mA); high-impedance node requiring short, shielded trace. |
| GND (Pin 4) | Analog and power ground | Must connect directly to low-impedance ground plane; serves as return for FB, LBI, RSET, and power paths. |
| SW (Pin 5) | Collector of internal NPN power transistor | Drives external inductor; requires minimal trace length and loop area to reduce EMI and switching losses. |
| 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 | ≤0.4V disables switching (3µA IQ); ≥1.4V enables operation; compatible with 1.8V/3.3V/5V logic. |
| FB (Pin 8) | Feedback input for output regulation | Compares divided VOUT against 1.23V reference; bias current <30nA enables high-resistor-divider designs. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable peak switch current | 30mA to 500mA via single external resistor - eliminates need for multiple part numbers across load ranges. |
| Ultra-low quiescent current | 33µA active / 3µA shutdown - extends battery life in energy-constrained applications such as remote sensors. |
| Integrated low-battery detector | 1.17V threshold with 35mV hysteresis and active-in-shutdown LBO - enables system-level battery management without extra ICs. |
| Low-VIN capability | Operates down to 1.5V - supports direct use with 2-cell alkaline, NiMH, or Li coin cells without booster pre-stage. |
| Logic-level shutdown interface | 1.4V high / 0.4V low thresholds - interoperable with modern microcontrollers and PMICs without level-shifting. |
Applications
| Battery Backup Systems | LCD Bias Generation |
|---|---|
|
Use Scenario: Maintaining real-time clock or SRAM state during main power failure using supercapacitor or backup battery. IC Role / Device Role / Timing Role: Step-up regulator providing regulated 3.3V or 5V from decaying backup source (e.g., 0.8–2.5V supercap). Use Value: Integrated LBI/LBO enables autonomous switchover and end-of-life warning; 3µA shutdown IQ preserves backup energy. |
Use Scenario: Generating ±15V or +28V for segment driving in portable LCD displays powered by 2-cell batteries. IC Role / Device Role / Timing Role: High-efficiency boost converter with programmable current limit to drive capacitive LCD loads. Use Value: 1.5V start-up and 500mA peak current support fast charging of large bias capacitors; RSET tuning avoids inductor saturation. |
| Low-Power Telecom Converters | Solenoid/Actuator Drivers |
|
Use Scenario: Converting –48V telecom line voltage to isolated 5V/3.3V for monitoring circuitry in legacy infrastructure. IC Role / Device Role / Timing Role: Primary-side controller in non-isolated flyback topology, regulating output via optocoupler feedback. Use Value: Precise peak current limit ensures stable operation under varying line conditions; low IQ reduces standby power draw. |
Use Scenario: Energizing 12V solenoids from 2-cell (3V) battery packs in portable medical or industrial tools. IC Role / Device Role / Timing Role: Controlled-current boost stage delivering pulsed high-voltage pulses to solenoid coil. Use Value: Programmable peak current prevents battery sag and thermal stress; shutdown pin enables microcontroller-controlled actuation timing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar micropower step-up 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 LBI/LBO functions. | Lacks programmability - suitable only where 200mA limit is sufficient and design simplicity is prioritized. | Select when RSET flexibility is unnecessary and BOM count reduction is critical; not drop-in due to missing RSET functionality. |
| MAX17222ETA+T | 300mA fixed peak current; 0.9V min VIN; 1.6µA IQ; integrated soft-start; different pinout (6-pin TDFN). | Enables lower-VIN operation and deeper sleep, but lacks LBO output and requires PCB redesign. | Choose for sub-1.5V inputs or ultra-low-power wake-on-event systems; not pin-compatible or functionally equivalent. |
Compared with LT1316IS8#TRPBF, LT1304CS8#PBF trades programmability for simplicity and lower cost, while MAX17222ETA+T offers lower VIN and IQ at the expense of integrated battery monitoring and pin compatibility - making LT1316IS8#TRPBF uniquely suited for industrial battery-backed systems requiring configurable current limiting and active shutdown monitoring.
Availability
LT1316IS8#TRPBF is available at Aetrix Electronics and suitable for battery backup systems, LCD bias generation, low-power telecom converters, and solenoid drivers requiring stable component supply across extended temperature and long-lifecycle deployments.
Supply support for LT1316IS8#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 technical and manufacturing continuity for all Linear power products.
The LT1316 belongs to Linear's micropower DC/DC converter family, designed specifically for energy-constrained applications where battery life, low-VIN operation, and integrated system monitoring (e.g., low-battery detection) are critical.
FAQ
What is the minimum input voltage required for LT1316IS8#TRPBF to start switching?
The LT1316IS8#TRPBF begins switching at a minimum input voltage of 1.5V, as specified in the Absolute Maximum Ratings and Electrical Characteristics tables. This enables direct operation from two alkaline or NiMH cells, even as they discharge below 1.6V. The device maintains regulation down to this threshold, and the internal low-battery detector remains active below it - allowing graceful system shutdown before complete depletion.
How do I calculate the RSET resistor value for a desired peak switch current in LT1316IS8#TRPBF?
To set peak switch current in LT1316IS8#TRPBF, use Figure 3 ("DC Current Limit vs RSET Resistor") in the datasheet: locate your target current (e.g., 100mA), subtract ~18mA of turn-off delay overshoot (calculated as VIN/L × 300ns), then read the corresponding RSET value (e.g., ~33kΩ for 82mA). For precise results, verify with Equation (1) and Table 1, which provide validated RSET/inductor pairs for common VIN/VOUT combinations.
Does LT1316IS8#TRPBF support discontinuous conduction mode (DCM), and when is it required?
Yes, LT1316IS8#TRPBF operates in both continuous and discontinuous conduction modes. DCM is required when the calculated duty cycle exceeds 73%, such as in high-ratio boosts (e.g., 3.3V-to-28V). In DCM, output power is governed by POUT(MAX) = ½·L·IPEAK²·f, and design equations differ - see Design Example 2 in the datasheet. The IC automatically transitions between modes based on load and RSET setting.
Can LT1316IS8#TRPBF be used with ceramic output capacitors, and what ESR considerations apply?
Yes, LT1316IS8#TRPBF works with low-ESR ceramic output capacitors, especially when peak switch current is ≤100mA. For higher currents, AVX TPS tantalum or Sanyo OS-CON polymer capacitors are recommended to minimize ripple and ensure stability. The datasheet explicitly warns against generic electrolytics at high peak currents due to excessive ESR-induced voltage droop and heating - verified in TA01 and TA04 efficiency plots.
What is the purpose of the 100pF feedforward capacitor from VOUT to FB in LT1316IS8#TRPBF circuits?
The 100pF feedforward capacitor from VOUT to FB in LT1316IS8#TRPBF circuits (shown in Figure 6) reduces output ripple voltage by >40%, lowering it from ~140mVP-P to <80mVP-P (Figures 7 and 8). It acts as a high-frequency bypass that stabilizes the feedback loop during fast transients, improving regulation without affecting DC accuracy - a documented layout technique specific to the LT1316IS8#TRPBF's internal compensation architecture.
LT1316IS8#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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#TRPBF FAQ
1.How can I place an order for LT1316IS8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1316IS8#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 LT1316IS8#TRPBF reliable?
The price and inventory of LT1316IS8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1316IS8#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1316IS8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1316IS8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1316IS8#TRPBF?
LT1316IS8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1316IS8#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 LT1316IS8#TRPBF?
For technical support, including LT1316IS8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1316IS8#TRPBF requirements.
6.How does Aetrix verify that LT1316IS8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1316IS8#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 LT1316IS8#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1316IS8#TRPBF?
All LT1316IS8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1316IS8#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 LT1316IS8#TRPBF part is unused and in its original packaging.
Return procedure for LT1316IS8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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