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Analog Devices Inc. LT1316CMS8#PBF
- Part No.:
- LT1316CMS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LT1316CMS8#PBF.pdf
- Description:
- IC REG BOOST FLYBACK ADJ 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:150
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Product details
Overview
LT1316CMS8#PBF from Analog Devices (formerly Linear Technology) is a micropower step-up DC/DC converter with programmable peak switch current limiting, operating from as low as 1.5V input. It delivers up to 500mA peak switch current (set via RSET resistor), 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 supplies and low-power –48V-to-5V converters.
For engineers reviewing the LT1316CMS8#PBF datasheet, LT1316CMS8#PBF pinout, LT1316CMS8#PBF application, or LT1316CMS8#PBF equivalent, key selection criteria include its 1.5V minimum VIN, programmable 30–500mA peak current limit, 8-pin MSOP package, logic-level shutdown, and integrated low-battery detection active during shutdown.
Technical Context
The LT1316CMS8#PBF employs a fixed off-time (2µs typical), 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.
Peak switch current is precisely set by an external resistor (RSET) connected between Pin 3 and GND, establishing a constant reference current that controls comparator A2's trip point. The low-battery detector operates independently with 1.17V threshold, 35mV hysteresis, and open-collector LBO output capable of sinking 500µA - all functional even in shutdown mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 1.5V to 12V - enables direct operation from single Li coin cell or two alkaline cells without pre-regulation. |
| Quiescent Current (Active) | 33µA typical - minimizes standby drain in battery-critical applications like remote sensors. |
| Quiescent Current (Shutdown) | 3µA typical - preserves battery life while retaining low-battery monitoring capability. |
| Peak Switch Current Range | 30mA to 500mA - programmable via RSET resistor (3kΩ–150kΩ), supporting wide load and source-impedance requirements. |
| Switch Saturation Voltage | 300mV at 500mA - reduces conduction loss and improves efficiency in high-current boost stages. |
| Feedback Reference Voltage | 1.23V ±2% - sets regulated output voltage via external resistor divider (VOUT = 1.23V × (1 + R1/R2)). |
| Low-Battery Threshold | 1.17V with 35mV hysteresis - provides reliable undervoltage warning for primary cells down to ~1.4V VIN. |
Pinout & Package
LT1316CMS8#PBF 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/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| LBO (Pin 1) | Low-battery detector output | Open-collector output active low; sinks up to 500µA; remains functional in shutdown mode. |
| LBI (Pin 2) | Low-battery detector input | Monitors input supply; trips at 1.17V falling edge with 35mV hysteresis to prevent chatter. |
| RSET (Pin 3) | Peak current programming node | High-impedance input; connects to GND via resistor (3kΩ–150kΩ) to set precise peak switch current. |
| GND (Pin 4) | Analog and power ground | Primary return path for feedback, bias, and switch current; must connect directly to ground plane. |
| SW (Pin 5) | Switch collector node | Drives external inductor; requires short, low-inductance trace due to high di/dt switching (≤500mA pulses). |
| VIN (Pin 6) | Main input supply | Accepts 1.5V–12V; requires local ceramic bypass (≥1µF) placed adjacent to pin. |
| SHDN (Pin 7) | Logic-level enable/disable | Active-high control: ≥1.4V enables, ≤0.4V disables; draws <5µA when asserted. |
| FB (Pin 8) | Feedback input | Compares divided VOUT against 1.23V reference; bias current <30nA ensures minimal divider error. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable peak current limit | Enables optimization for high-impedance sources (e.g., lithium coin cells) without overcurrent risk or excessive inrush. |
| Always-on low-battery detection | Provides system-level battery health monitoring during full shutdown, critical for backup and maintenance-free devices. |
| Fixed 2µs off-time architecture | Guarantees stable burst-mode operation at ultra-light loads, maintaining regulation while minimizing IQ. |
| Logic-level shutdown interface | Direct compatibility with 1.8V/3.3V/5V microcontrollers eliminates level-shifting circuitry. |
| Integrated NPN power switch | Eliminates need for external transistor and driver, reducing BOM count and layout complexity in space-constrained designs. |
Applications
| Battery Backup Power Supply | 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/5V from decaying backup source (e.g., 0.8–2.5V supercap). Use Value: 3µA shutdown IQ extends backup runtime; programmable current limit prevents capacitor over-stress during recharge. | Use Scenario: Generating ±15V to ±28V bias rails for segment LCDs in handheld medical or industrial displays. IC Role / Device Role / Timing Role: High-efficiency boost converter driving transformer-coupled or charge-pump-derived negative/positive outputs. Use Value: 1.5V start-up supports dual-cell alkaline input; low noise and feedforward capacitor support (100pF) reduce ripple below 80mVP-P. |
| Low-Power Telecom Converter | Solenoid Driver Interface |
Use Scenario: Converting –48V telecom line voltage to isolated 5V/3.3V for auxiliary logic or monitoring circuits. IC Role / Device Role / Timing Role: Flyback controller core in non-isolated or transformer-coupled topologies with external MOSFET drive. Use Value: Precise peak current control ensures consistent energy transfer per cycle; LBI monitors input rail integrity before startup. | Use Scenario: Energizing 12V/24V solenoids from 2-cell alkaline or LiFePO₄ batteries in portable access control or valve actuators. IC Role / Device Role / Timing Role: Controlled-current boost stage feeding H-bridge or discrete driver, limiting inrush to extend battery life. Use Value: Programmable 50–200mA peak limit avoids battery sag; shutdown pin enables fast de-energization and fault recovery. |
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 |
|---|---|---|---|
| LT3467EMS8#PBF | Higher 2MHz switching frequency; integrated Schottky diode; 2.5V min VIN; 1.2A switch current. | Requires smaller inductors/caps; unsuitable for sub-2.5V inputs; higher IQ (80µA active). | Select when board area is constrained and input ≥2.5V; avoid for coin-cell or low-VIN use cases. |
| TPS61200DRCR | 1.8V–5.5V input; 1.2A switch; 5.5µA IQ (shutdown); no integrated LBI; different pinout and control scheme. | Lacks low-battery detection; requires external enable sequencing; optimized for Li-ion single-cell systems. | Prefer for 3.3V/5V systems needing higher output current; not drop-in for LBI-dependent designs. |
Compared with LT3467EMS8#PBF and TPS61200DRCR, the LT1316CMS8#PBF uniquely supports 1.5V start-up and retains active low-battery monitoring in shutdown - making it irreplaceable in long-life, ultra-low-VIN, and battery-health-aware applications where those functions are mandatory.
Availability
LT1316CMS8#PBF is available at Aetrix Electronics and suitable for battery backup, LCD bias, and low-power telecom converters requiring stable component supply, long-term lifecycle assurance, and guaranteed parametric performance across commercial and industrial temperature ranges.
Supply support for LT1316CMS8#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 manufacturing continuity for the LT1316 family.
The LT1316 belongs to Linear's micropower DC/DC converter product line, designed specifically for energy-constrained, battery-operated systems demanding ultra-low quiescent current, wide input range, and integrated system-monitoring features like low-battery detection.
FAQ
What is the minimum input voltage required for LT1316CMS8#PBF to start switching?
The LT1316CMS8#PBF begins switching at a minimum input voltage of 1.5V, as specified in the Absolute Maximum Ratings and Electrical Characteristics tables. This allows direct operation from two alkaline cells (fresh or partially discharged) or a single lithium coin cell. Startup behavior is guaranteed down to 1.5V at 25°C; performance at lower temperatures may require verification per the datasheet's temperature derating curves.
How do I set the peak switch current for LT1316CMS8#PBF?
To set the peak switch current for LT1316CMS8#PBF, connect a resistor (RSET) between Pin 3 (RSET) and GND. Resistor values from 3kΩ to 150kΩ program peak currents from ~500mA down to ~25mA. For example, a 10kΩ resistor yields ~300mA peak current at 25°C. Refer to Figure 3 ("DC Current Limit vs RSET Resistor") in the datasheet for precise mapping, and account for ~18mA overshoot due to transistor turn-off delay in high-accuracy designs.
Does LT1316CMS8#PBF retain low-battery detection functionality during shutdown?
Yes, LT1316CMS8#PBF retains full low-battery detection functionality during shutdown. The LBI input and LBO open-collector output remain active, with LBI threshold at 1.17V (falling edge) and 35mV hysteresis. LBO can sink up to 500µA and operates down to VIN ≈ 1.4V - enabling continuous battery health monitoring even when the main converter is disabled.
What package type is used for LT1316CMS8#PBF, and what are its thermal characteristics?
LT1316CMS8#PBF uses the 8-lead MSOP (MS8) package, measuring 3.0mm × 3.0mm × 0.85mm with an exposed thermal pad. Its junction-to-ambient thermal resistance (θJA) is 160°C/W under standard JEDEC conditions. For optimal thermal performance, the exposed pad must be soldered to a PCB copper pour connected to GND, and airflow or additional copper area should be considered in high-duty-cycle applications.
Can LT1316CMS8#PBF be used in discontinuous conduction mode (DCM)?
Yes, LT1316CMS8#PBF is explicitly designed to operate in both continuous and discontinuous conduction modes. DCM is required when the calculated duty cycle exceeds 73% (e.g., high VOUT/VIN ratios like 28V from 3.3V), or when peak current is set below ~50mA. The datasheet provides dedicated equations and design examples (e.g., Design Example 2) for sizing inductors and RSET in DCM to ensure stable regulation and predictable power delivery.
LT1316CMS8#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm 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-MSOP
LT1316CMS8#PBF FAQ
1.How can I place an order for LT1316CMS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1316CMS8#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 LT1316CMS8#PBF reliable?
The price and inventory of LT1316CMS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1316CMS8#PBF is usually 5 days.
3.What payment methods are accepted for LT1316CMS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1316CMS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1316CMS8#PBF?
LT1316CMS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1316CMS8#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 LT1316CMS8#PBF?
For technical support, including LT1316CMS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1316CMS8#PBF requirements.
6.How does Aetrix verify that LT1316CMS8#PBF is sourced from the original manufacturer or authorized distributors?
All LT1316CMS8#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 LT1316CMS8#PBF meets industry standards.
7.What is the process for return or replacement of LT1316CMS8#PBF?
All LT1316CMS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1316CMS8#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 LT1316CMS8#PBF part is unused and in its original packaging.
Return procedure for LT1316CMS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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