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Analog Devices Inc. LT1316CS8#TRPBF
- Part No.:
- LT1316CS8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1316CS8#TRPBF.pdf
- Description:
- IC REG BST FLYBACK ADJ 750MA 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:4,882
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Product details
Overview
LT1316CS8#TRPBF from Analog Devices (formerly Linear Technology) is a 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 monitoring. It serves as the core voltage booster in space-constrained, battery-powered systems such as coin-cell–powered LCD bias supplies and industrial sensor nodes.
For engineers reviewing the LT1316CS8#TRPBF datasheet, LT1316CS8#TRPBF pinout, LT1316CS8#TRPBF application, or LT1316CS8#TRPBF equivalent, key selection criteria include its 8-lead SO package compatibility, precise RSET-based current limiting, burst-mode efficiency at light loads, and guaranteed operation across 0°C to 70°C commercial temperature range.
Technical Context
The LT1316CS8#TRPBF employs a fixed off-time (1.4–2.6µs), variable on-time PWM control architecture that enables stable regulation while maintaining 33µA quiescent current in active mode and dropping to just 3µA in shutdown - with the low-battery detector (LBI/LBO) remaining fully functional. Its internal NPN power switch exhibits 300mV saturation voltage at 500mA, supporting high-efficiency boost conversion from weak sources like lithium coin cells.
Peak switch current is set externally via a single resistor (RSET) connected between Pin 3 and GND, enabling precise current limiting from 25mA to 340mA depending on resistance value (e.g., 10kΩ yields ~290mA typ). The feedback comparator has a 1.23V reference with ±0.5% accuracy over temperature, and the device supports logic-level shutdown (1.4V high threshold, 0.4V low threshold).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 1.5V to 12V - enables direct operation from single- or dual-cell alkaline, NiMH, or Li coin cells without pre-regulation. |
| Quiescent Current (Active) | 33µA typ - minimizes standby drain in always-on battery backup systems, extending shelf life. |
| Quiescent Current (Shutdown) | 3µA typ - preserves battery charge while retaining low-battery monitoring capability. |
| Peak Switch Current Range | 25mA to 340mA - programmable via RSET resistor to match source impedance and load requirements. |
| Switch Saturation Voltage | 300mV at 500mA - reduces conduction loss and improves efficiency in high-current boost stages. |
| Feedback Reference Voltage | 1.23V ±1.6% - enables accurate output voltage setting (e.g., 5V via 1MΩ/324kΩ divider) with minimal drift. |
| Low-Battery Detector Threshold | 1.17V falling-edge trip with 35–65mV hysteresis - provides reliable undervoltage warning before system brownout. |
Pinout & Package
LT1316CS8#TRPBF 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; leads are gull-wing, lead-free (RoHS-compliant), and rated for 300°C soldering (10 sec).
| 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 battery health monitoring. |
| LBI (Pin 2) | Low-battery input | High-impedance input (3–20nA bias) with built-in 1.17V reference; hysteresis prevents chatter near threshold. |
| RSET (Pin 3) | Peak current programming node | Accepts 3kΩ–150kΩ resistor to GND; sets peak switch current with <±10% tolerance across temperature. |
| GND (Pin 4) | Analog and power ground | Must connect directly to low-impedance ground plane; separates sensitive analog references from switching return paths. |
| SW (Pin 5) | Collector of internal NPN switch | Drives external inductor; requires short, low-inductance trace to minimize ringing and EMI. |
| VIN (Pin 6) | Main input supply | Accepts 1.5–12V; must be bypassed with ≥47µF tantalum or low-ESR ceramic capacitor placed adjacent to pin. |
| SHDN (Pin 7) | Logic-level shutdown control | 0V disables switching (3µA IQ); ≥1.4V enables operation; compatible with microcontroller GPIO without level shift. |
| FB (Pin 8) | Feedback input | Compares divided VOUT against 1.23V reference; 3–30nA bias current demands high-resistance divider design. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable peak current limit | Adjustable from 25mA to 340mA using single external resistor - eliminates need for multiple BOM variants across load profiles. |
| Micropower shutdown with active monitoring | 3µA IQ + always-on LBI/LBO - enables long-term battery-backed memory retention or sensor wake-up triggers without auxiliary circuitry. |
| Ultra-low minimum input voltage | 1.5V start-up and operation - supports direct use with aging or partially discharged 2-cell alkaline or LiMnO₂ coin cells. |
| Integrated low-battery detector | 1.17V threshold with 35–65mV hysteresis and open-drain output - provides system-level battery health signaling without external comparators. |
| Logic-compatible shutdown interface | 1.4V high / 0.4V low thresholds - interfaces directly with 3.3V or 5V MCU I/O pins, eliminating pull-up resistors or level translators. |
Applications
| Battery Backup Power Supply | LCD Bias Generation |
|---|---|
|
Use Scenario: Maintaining SRAM or real-time clock (RTC) voltage during main power failure using a supercapacitor or backup 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: 33µA quiescent current extends backup runtime; programmable current limit prevents over-stressing weak backup sources. |
Use Scenario: Generating ±15V to ±28V bias rails for segment-driven STN or TFT LCD panels in handheld medical or test equipment. IC Role / Device Role / Timing Role: Primary boost controller in non-isolated or flyback-derived bipolar bias supply. Use Value: 1.5V minimum VIN allows direct use of 2-cell alkaline inputs; low-noise feedback and optional feedforward capacitor reduce ripple to <80mVP-P. |
| Low-Power –48V to 5V Converter | USB-Powered 5V/100mA Supply |
|
Use Scenario: Deriving isolated 5V logic power from legacy telecom –48V distribution in remote sensors or field instruments. IC Role / Device Role / Timing Role: Flyback controller driving external transformer primary with fixed off-time regulation. Use Value: Active shutdown with LBO monitoring ensures graceful shutdown before –48V rail collapse; 750mA max switch current supports >1W output. |
Use Scenario: Providing regulated 5V/100mA from unregulated 4–7V USB port for embedded peripherals or dongles. IC Role / Device Role / Timing Role: Efficient step-up regulator compensating for USB cable drop and host port tolerance. Use Value: 90% peak efficiency at 50mA load; RSET tuning avoids inductor saturation under USB current limits (500mA). |
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 |
|---|---|---|---|
| LT1307CS8#TRPBF | 600kHz fixed-frequency PWM; no RSET current programming; 130µA IQ; 1-cell optimized (0.9V start) | Lacks programmable current limit and low-battery detector; better suited for higher-frequency, lower-noise apps where source impedance is low | Select when board space favors higher switching frequency and source is robust (e.g., Li-ion); avoid when coin-cell sourcing or battery monitoring required |
| MAX17222ASA+T | 1.8V min VIN; 1.7µA shutdown IQ; integrated 0.45Ω MOSFET; no LBI/LBO; 92% peak efficiency | No battery monitoring; lower IQ but higher min VIN limits use with aged alkaline or Li coin cells | Prefer for ultra-long-life applications with fresh primary cells; not suitable for systems requiring battery health signaling or sub-1.8V operation |
Compared with LT1316CS8#TRPBF, LT1307CS8#TRPBF trades current programmability and battery monitoring for higher switching frequency and simpler layout, while MAX17222ASA+T offers lower shutdown IQ but sacrifices sub-1.8V operation and integrated fault detection - making LT1316CS8#TRPBF uniquely balanced for coin-cell–fed systems needing both efficiency and intelligence.
Availability
LT1316CS8#TRPBF is available at Aetrix Electronics and suitable for battery backup, LCD bias, and low-power industrial converter applications requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for LT1316CS8#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 continuity, technical documentation, and manufacturing for legacy Linear parts including the LT1316 family.
The LT1316 belongs to Linear's micropower DC/DC converter product line, designed specifically for energy-constrained applications where input voltage may fall below 2V and system intelligence (e.g., battery monitoring) must persist even in shutdown.
FAQ
What is the minimum input voltage required for LT1316CS8#TRPBF to start switching?
The LT1316CS8#TRPBF starts switching at 1.5V typical, with guaranteed operation down to 1.65V across the commercial temperature range (0°C to 70°C). This enables direct use with two fresh alkaline cells (~3.0V) or a single LiMnO₂ coin cell (~3.0V), and continued operation as the cells discharge to ~1.5V per cell - critical for maximizing usable battery capacity in portable devices.
How do I calculate the RSET resistor value for a target peak switch current of 100mA?
To achieve ~100mA peak switch current with LT1316CS8#TRPBF, select RSET ≈ 27.4kΩ based on Figure 3 in the datasheet. Account for ~18mA overshoot due to transistor turn-off delay (300ns) when VIN = 2V and L = 33µH; thus, target DC limit is ~82mA, corresponding to 33kΩ. Use 1% metal-film resistor and keep the RSET trace short and free of capacitance to maintain accuracy.
Does LT1316CS8#TRPBF remain functional during shutdown mode?
Yes - the LT1316CS8#TRPBF retains full functionality of its low-battery detector (LBI/LBO) during shutdown mode, drawing only 3µA quiescent current. The LBO output remains active and can sink up to 500µA, allowing external circuitry to monitor battery voltage and trigger wake-up or alert signals even when the main boost converter is disabled.
Can LT1316CS8#TRPBF drive a 5V/50mA load from a 2-cell alkaline input?
Yes - the LT1316CS8#TRPBF efficiently delivers 5V/50mA from two alkaline cells (2.0–3.0V input) using a 47µH inductor, MBR0520L Schottky diode, and 47µF output capacitor. At 50mA load, typical efficiency exceeds 85% (see Figure TA02), and RSET = 10kΩ sets peak current to ~290mA, ensuring stable operation even as cell voltage drops to 2.0V.
What is the purpose of the feedforward capacitor from VOUT to FB in LT1316CS8#TRPBF designs?
A 50–100pF feedforward capacitor from VOUT to FB (as shown in Figure 6) reduces output ripple voltage in LT1316CS8#TRPBF circuits by injecting high-frequency error correction into the feedback loop. In the 2-cell-to-5V application, this capacitor lowers ripple from ~140mVP-P to <80mVP-P, improving noise-sensitive analog or RF subsystem performance without increasing output capacitance.
LT1316CS8#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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LT1316CS8#TRPBF FAQ
1.How can I place an order for LT1316CS8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1316CS8#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 LT1316CS8#TRPBF reliable?
The price and inventory of LT1316CS8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1316CS8#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1316CS8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1316CS8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1316CS8#TRPBF?
LT1316CS8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1316CS8#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 LT1316CS8#TRPBF?
For technical support, including LT1316CS8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1316CS8#TRPBF requirements.
6.How does Aetrix verify that LT1316CS8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1316CS8#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 LT1316CS8#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1316CS8#TRPBF?
All LT1316CS8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1316CS8#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 LT1316CS8#TRPBF part is unused and in its original packaging.
Return procedure for LT1316CS8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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