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Analog Devices Inc. LT1316CMS8#TRPBF
- Part No.:
- LT1316CMS8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LT1316CMS8#TRPBF.pdf
- Description:
- IC REG BOOST FLYBACK ADJ 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,726
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Product details
Overview
LT1316CMS8#TRPBF 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, achieves 33µA quiescent current in active mode and 3µA in shutdown, and integrates an always-active low-battery detector (LBI/LBO). It is used in battery-powered LCD bias, solenoid drivers, and low-power –48V-to-5V conversion.
For engineers reviewing the LT1316CMS8#TRPBF datasheet, LT1316CMS8#TRPBF pinout, LT1316CMS8#TRPBF application, or LT1316CMS8#TRPBF equivalent, key selection criteria include its 8-lead MSOP package, programmable 30–500mA peak current via RSET, fixed off-time regulation, 1.23V feedback reference, and operation down to 1.5V VIN - critical for coin-cell and telecom-line powered systems.
Technical Context
The LT1316CMS8#TRPBF 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. Its internal NPN power transistor features low VCE(SAT) (300mV at 500mA), and the RSET pin allows direct programming of peak switch current between 30mA and 500mA using a single external resistor.
It integrates a dedicated low-battery detector with 1.17V threshold, 35mV hysteresis, and open-collector LBO output that remains functional during shutdown. The FB pin uses a precision 1.23V reference with ±2.5mV typical tolerance over temperature, enabling accurate output voltage setting via resistive divider.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 1.5V to 12V - supports single- or dual-cell alkaline, lithium, or NiMH sources without external LDO pre-regulation. |
| Quiescent Current | 33µA (active), 3µA (shutdown) - enables multi-year battery life in standby-critical IoT and portable medical devices. |
| Peak Switch Current | Programmable 30–500mA via RSET resistor - allows optimization for efficiency vs. size trade-offs in inductor selection. |
| Feedback Reference | 1.23V ±2.5mV - ensures stable output regulation across temperature and load, supporting precise VOUT = 1.23(1 + R1/R2). |
| Switch Saturation Voltage | 300mV at 500mA - reduces conduction loss and improves efficiency in high-current boost stages. |
| Low-Battery Threshold | 1.17V with 35mV hysteresis - provides clean, chatter-free battery depletion signaling even during deep discharge. |
| Shutdown Logic Level | SHDN high ≥1.4V, low ≤0.4V - compatible with standard CMOS/LVTTL GPIOs without level-shifting circuitry. |
Pinout & Package
LT1316CMS8#TRPBF is housed in an 8-lead MSOP (MS8) package, 3.0mm × 3.0mm × 0.85mm, with exposed pad for thermal enhancement (θJA = 160°C/W). Pin 1 is marked with dot; pin count proceeds counterclockwise.
| 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 battery divider; triggers LBO with built-in hysteresis. |
| RSET (Pin 3) | Peak current programming input | High-Z node held at 0.5V internally; sets peak switch current via resistor to GND (3kΩ–150kΩ range). |
| GND (Pin 4) | Analog and power ground | Must connect directly to low-impedance ground plane; separates analog and power return paths for noise immunity. |
| SW (Pin 5) | NPN collector switch node | Drives external inductor; requires short, wide trace to minimize ringing and EMI; handles pulsed currents up to 750mA. |
| VIN (Pin 6) | Main input supply | Accepts 1.5–12V; must be bypassed with ≥47µF low-ESR capacitor placed adjacent to pin. |
| SHDN (Pin 7) | Logic-level shutdown control | CMOS-compatible input; grounding disables switching while preserving LBI/LBO functionality. |
| FB (Pin 8) | Feedback input for output regulation | Connects to resistive divider tap; 3nA max bias current enables high-value dividers for low quiescent drain. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable Peak Switch Current | Set precisely between 30mA and 500mA using one external resistor - eliminates need for multiple fixed-current IC variants. |
| Ultra-Low Quiescent Current | 33µA active / 3µA shutdown - extends battery runtime in always-on sensor nodes and backup systems. |
| Integrated Low-Battery Detector | Always-active comparator with 1.17V threshold and 35mV hysteresis - enables autonomous battery health monitoring without MCU intervention. |
| Low-Voltage Operation | Starts and regulates from 1.5V input - supports single AA/AAA or CR2032 cells without booster pre-stage. |
| Fixed Off-Time Regulation | 2µs nominal off-time with variable on-time - delivers stable efficiency across wide input/output ratios and load conditions. |
Applications
| Battery Backup Power Supply | LCD Bias Generation |
|---|---|
Use Scenario: Maintaining real-time clock and 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 1.8–2.5V backup source. Use Value: 3µA shutdown current preserves backup energy; LBO signal triggers graceful system hibernation before brownout. | Use Scenario: Generating ±15V to ±28V bias rails for segment LCDs in handheld meters and industrial HMIs. IC Role / Device Role / Timing Role: High-efficiency flyback or inverting boost controller driving transformer-coupled or charge-pump topologies. Use Value: Programmable peak current allows optimal inductor sizing for low-profile designs; 1.5V start enables direct coin-cell interface. |
| Low-Power Telecom Line Power | Portable Solenoid Driver |
Use Scenario: Deriving local 5V/3.3V from legacy telephone line (–48V) with strict current draw limits. IC Role / Device Role / Timing Role: Isolated flyback controller operating in discontinuous conduction mode with tight input current control. Use Value: RSET-programmable current limit prevents line overload; 12V absolute max rating ensures robustness against line transients. | Use Scenario: Energizing 12V/24V solenoids from 2-cell alkaline batteries in portable locking or fluid control devices. IC Role / Device Role / Timing Role: Current-limited boost stage delivering controlled pulse current to inductive load. Use Value: Precise peak current limiting avoids battery sag and extends cycle life; LBO detection prevents deep discharge damage. |
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 |
|---|---|---|---|
| LTC3526L-3.3 | Fixed 3.3V output, 400mA peak, 2.5MHz switching, 20µA IQ, 12V max input | No RSET programmability; no integrated LBI/LBO; smaller solution size but less flexible voltage/current tuning | Select when fixed 3.3V output and higher frequency (smaller inductor) are prioritized over battery monitoring and current flexibility. |
| TPS61200 | 1.8–5.5V input, 3.3/5.0V fixed or adjustable, 1.2A peak, 50µA IQ, integrated soft-start | Higher peak current, wider input range, but lacks low-battery detector and requires external enable logic for shutdown | Select for higher output current capability and broader input compatibility where LBI/LBO is implemented externally. |
Compared with LTC3526L-3.3 and TPS61200, the LT1316CMS8#TRPBF uniquely combines ultra-low IQ, programmable current limiting, and always-active battery monitoring in a compact MSOP - making it optimal for long-life, resource-constrained, battery-depletion-aware systems.
Availability
LT1316CMS8#TRPBF is available at Aetrix Electronics and suitable for battery backup, LCD bias, and low-power telecom line power applications requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for LT1316CMS8#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 product support, datasheets, and application engineering for the LT family.
The LT1316 belongs to Linear's micropower DC/DC converter product line, designed specifically for energy-constrained applications where extended battery life, low-voltage startup, and intelligent power management (e.g., battery health awareness) are essential.
FAQ
What is the minimum input voltage required for LT1316CMS8#TRPBF to start switching?
The LT1316CMS8#TRPBF begins switching at an input voltage as low as 1.5V, with guaranteed operation down to 1.65V across commercial temperature range. This enables direct use with single alkaline, lithium coin, or NiMH cells without pre-boost circuitry. Startup behavior is validated per Absolute Maximum Ratings and Electrical Characteristics tables in the official datasheet.
How do I set the peak switch current for LT1316CMS8#TRPBF?
To set peak switch current for LT1316CMS8#TRPBF, connect a resistor (RSET) between Pin 3 (RSET) and GND. Values from 3kΩ to 150kΩ program 30mA to 500mA respectively, per Figure 3 in the datasheet. For example, 27.4kΩ yields ~100mA peak. Avoid floating or shorting RSET; keep traces short and capacitance-free.
Does LT1316CMS8#TRPBF remain functional in shutdown mode?
Yes - in shutdown mode (SHDN = GND), the LT1316CMS8#TRPBF disables switching and reduces quiescent current to 3µA, but the low-battery detector (LBI/LBO) remains fully active. LBO will assert low if LBI drops below 1.17V, enabling system-level battery monitoring even during deep sleep.
What package type is used by LT1316CMS8#TRPBF?
The LT1316CMS8#TRPBF uses an 8-lead MSOP (MS8) package, measuring 3.0mm × 3.0mm × 0.85mm with exposed thermal pad. It is distinct from the SO-8 variant (LT1316CS8#TRPBF) and requires layout adherence to LTC DWG #05-08-1660 for thermal and electrical performance.
Can LT1316CMS8#TRPBF regulate output voltage accurately under varying load conditions?
Yes - the LT1316CMS8#TRPBF uses a precision 1.23V feedback reference (±2.5mV typical) and low FB pin bias current (<30nA) to maintain stable output regulation across load, line, and temperature. Its fixed off-time control scheme ensures consistent efficiency and transient response, as verified in Typical Performance Characteristics (e.g., Figure G08, G02).
LT1316CMS8#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm 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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-MSOP
LT1316CMS8#TRPBF FAQ
1.How can I place an order for LT1316CMS8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1316CMS8#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 LT1316CMS8#TRPBF reliable?
The price and inventory of LT1316CMS8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1316CMS8#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1316CMS8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1316CMS8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1316CMS8#TRPBF?
LT1316CMS8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1316CMS8#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 LT1316CMS8#TRPBF?
For technical support, including LT1316CMS8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1316CMS8#TRPBF requirements.
6.How does Aetrix verify that LT1316CMS8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1316CMS8#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 LT1316CMS8#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1316CMS8#TRPBF?
All LT1316CMS8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1316CMS8#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 LT1316CMS8#TRPBF part is unused and in its original packaging.
Return procedure for LT1316CMS8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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