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Analog Devices Inc. LT1317BCMS8#TRPBF
- Part No.:
- LT1317BCMS8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LT1317BCMS8#TRPBF.pdf
- Description:
- IC REG BST SEPIC ADJ 710MA 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,062
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Product details
Overview
LT1317BCMS8#TRPBF from Analog Devices (formerly Linear Technology) is a micropower, fixed-frequency 600kHz step-up DC/DC converter in an 8-lead MSOP package. It operates from 1.5V to 12V input, delivers up to 200mA output current, features a 1.24V feedback reference, and maintains continuous switching at light loads-unlike the Burst Mode LT1317 variant. It is used in battery-powered medical devices like glucose meters and portable diagnostic instrumentation.
For engineers reviewing the LT1317BCMS8#TRPBF datasheet, LT1317BCMS8#TRPBF pinout, LT1317BCMS8#TRPBF application, or LT1317BCMS8#TRPBF equivalent, key selection criteria include its non-Burst Mode operation for ripple-sensitive 3.3V/5V boost supplies, low 300mV VCE(SAT) at 500mA switch current, and integrated low-battery detector with 200mV reference active during shutdown.
Technical Context
The LT1317BCMS8#TRPBF implements a current-mode PWM architecture with a 600kHz oscillator and internal NPN power switch. Its error amplifier uses external RC compensation on the VC pin to stabilize the control loop across input voltage and load variations, supporting ceramic or tantalum output capacitors.
Unlike the LT1317, the LT1317B variant disables Burst Mode via a lower bias point on comparator A1, ensuring constant-frequency operation down to ≤50mA loads-eliminating low-frequency output ripple but reducing light-load efficiency. The low-battery detector remains fully functional during shutdown, with LBI threshold at 200mV ±10mV and open-collector LBO output.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 600kHz fixed (±100kHz tolerance); enables compact magnetics and predictable EMI filtering. |
| Input Voltage Range | 1.5V to 12V; supports single Li-ion (2.7–4.2V), dual alkaline (2.4–3.2V), or universal wall adapter inputs. |
| Feedback Reference | 1.24V ±20mV; sets regulated output via resistor divider (e.g., 3.3V = 1.24V × (1 + R1/R2)). |
| Switch VCE(SAT) | 300mV at 500mA; minimizes conduction loss and thermal rise in high-current boost stages. |
| Quiescent Current | 7.5mA typical when switching (VSHDN = 2V); defines minimum operating current under active regulation. |
| Low-Battery Threshold | 200mV ±10mV on LBI pin; enables precise undervoltage lockout without external comparators. |
| Shutdown Current | 40µA max (VSHDN = 0V); preserves battery life while retaining low-battery monitoring capability. |
Pinout & Package
LT1317BCMS8#TRPBF is housed in an 8-lead plastic MSOP (MS8) package, 3.0mm × 3.0mm × 0.86mm, with exposed pad for thermal enhancement. Pin 1 is VC (compensation), pin 4 is GND, pin 5 is SW (switch node), and pin 8 is LBO (open-collector low-battery output).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VC (Pin 1) | Compensation node for error amplifier | Connects external RC network (e.g., 33kΩ + 3.3nF) to set loop bandwidth and phase margin. |
| FB (Pin 2) | Feedback input | Monitors output voltage divider; 1.24V reference ensures stable regulation across temperature. |
| SHDN (Pin 3) | Enable/disable control | Pull ≤0.4V to shut down IC (except LBI/LBO); float or apply 1.4–6V to enable. |
| GND (Pin 4) | Power and signal ground | Must connect directly to local ground plane; serves as return for SW, FB, and VC paths. |
| SW (Pin 5) | Switch node | Drives external inductor/diode; high di/dt requires short, wide traces to minimize EMI. |
| VIN (Pin 6) | Main supply input | Bypassed with ≥10µF capacitor placed <5mm away to prevent instability or oscillation. |
| LBI (Pin 7) | Low-battery detector input | Accepts divided battery voltage; 200mV threshold remains active even in shutdown mode. |
| LBO (Pin 8) | Low-battery detector output | Open-collector NPN; sinks 10µA; requires external pull-up (e.g., 1MΩ) to interface with microcontroller. |
Key Features
| Feature | Design Value |
|---|---|
| Continuous switching at light loads | Eliminates low-frequency output ripple (<1kHz) critical for noise-sensitive analog circuits and ADC references. |
| Integrated low-battery detector | 200mV ±10mV threshold with active-in-shutdown operation enables reliable battery monitoring without auxiliary circuitry. |
| Low VCE(SAT) switch | 300mV at 500mA reduces conduction loss by >50% vs. typical 600mV switches, improving efficiency at medium loads. |
| External frequency compensation | VC pin allows optimization of transient response and stability for diverse output capacitors (ceramic/tantalum) and load profiles. |
| Wide input range (1.5V–12V) | Supports direct connection to single-cell Li-ion, multi-cell alkaline/NiMH, or industrial 5V/12V rails without pre-regulation. |
Applications
| Glucose Meters | Portable Diagnostic Instruments |
|---|---|
Use Scenario: Battery-powered handheld device measuring blood glucose concentration using electrochemical sensor strips. IC Role / Device Role / Timing Role: Step-up converter generating stable 3.3V rail from 2×AA batteries (2.4–3.2V) to power microcontroller, sensor bias, and LCD driver. Use Value: Continuous switching (LT1317B) avoids low-frequency ripple that could corrupt low-level analog sensor readings. | Use Scenario: Portable ultrasound or ECG monitor powered by rechargeable Li-ion battery (2.7–4.2V). IC Role / Device Role / Timing Role: Generates isolated 5V and ±4V rails for op-amp front-end, ADC reference, and display backlight from single-cell input. Use Value: Integrated 200mV low-battery detector triggers graceful shutdown before sensor calibration drift occurs. |
| Cordless Telephones | GPS Receivers |
Use Scenario: Base station or handset requiring regulated 3.3V for RF transceiver and digital baseband ICs. IC Role / Device Role / Timing Role: Boost converter delivering 200mA at 3.3V from 3.6V NiMH pack, with SHDN controlled by system MCU. Use Value: 7.5mA quiescent current during active operation balances efficiency and fast wake-up response. | Use Scenario: Compact GPS module in asset tracker or wearable device powered by coin cell or small Li-ion. IC Role / Device Role / Timing Role: Generates 3.3V supply for GPS SoC and RF front-end from 1.5–2.5V input (e.g., CR2032 or LiFePO₄). Use Value: 1.5V minimum start-up voltage enables operation down to near-end-of-life battery voltage. |
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 |
|---|---|---|---|
| LT1317CMS8#TRPBF | Includes Burst Mode operation at light loads; 100µA quiescent current vs. 7.5mA; higher light-load efficiency but introduces low-frequency ripple. | Suitable where ultra-low standby power is prioritized over ripple sensitivity (e.g., pagers, remote sensors). | Select LT1317CMS8#TRPBF only if system can tolerate ~1–10Hz output ripple and requires <100µA no-load draw. |
| LT1307BCS8#TRPBF | Single-cell optimized (1.5V–10V), same 600kHz frequency and pinout, but lacks integrated low-battery detector and has higher 500mV VCE(SAT). | Used in cost-sensitive, space-constrained applications without battery monitoring needs (e.g., basic cordless phones). | Choose LT1307BCS8#TRPBF when LBI/LBO functionality is unnecessary and board area permits SO-8 instead of MSOP. |
Compared with LT1317CMS8#TRPBF, the LT1317BCMS8#TRPBF trades light-load efficiency for ripple-free regulation-critical for precision analog systems-while both share identical pinout and compensation design. Against LT1307BCS8#TRPBF, it adds essential battery monitoring at no pin count or layout penalty.
Availability
LT1317BCMS8#TRPBF is available at Aetrix Electronics and suitable for glucose meters, portable diagnostic instruments, cordless telephones, and GPS receivers requiring stable component supply, long-term manufacturability, and guaranteed traceable sourcing.
Supply support for LT1317BCMS8#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 legacy Linear parts including the LT1317 series.
The LT1317 family was designed for micropower, wide-input-voltage boost conversion in portable medical, telecom, and instrumentation equipment-emphasizing integration (low-battery detect, compensation), efficiency across load range, and robust layout guidance.
FAQ
What is the primary functional difference between LT1317BCMS8#TRPBF and LT1317CMS8#TRPBF?
The LT1317BCMS8#TRPBF disables Burst Mode operation, maintaining continuous 600kHz switching even at light loads (≤50mA), which eliminates low-frequency output ripple but increases quiescent current to 7.5mA. In contrast, the LT1317CMS8#TRPBF enters Burst Mode below ~300µA load, reducing quiescent current to 100µA but introducing 1–10Hz ripple. Both share identical pinout, package, and compensation network requirements.
Can LT1317BCMS8#TRPBF operate from a single 1.5V alkaline cell?
Yes, LT1317BCMS8#TRPBF supports input voltages as low as 1.5V per the datasheet's absolute minimum specification. It starts reliably into full load (e.g., 200mA at 3.3V) from 1.5V input when paired with appropriate inductors (e.g., Sumida CD43-100) and low-VF Schottky diodes (e.g., MBR0520). Efficiency drops below 60% at 1.5V input but remains functional for short-duration operation.
What is the purpose of the LBI and LBO pins on LT1317BCMS8#TRPBF?
The LBI (Low-Battery Input) pin accepts a scaled-down battery voltage, comparing it against an internal 200mV reference. When LBI falls below this threshold, the open-collector LBO (Low-Battery Output) pin pulls low to signal battery depletion. Critically, this detector remains active during shutdown (SHDN = 0V), enabling host microcontrollers to monitor battery health without powering the full converter.
How should the VC pin be configured for optimal transient response with a 10µF ceramic output capacitor?
For a 10µF ceramic output capacitor, the LT1317BCMS8#TRPBF requires reduced compensation values versus the standard 33kΩ/3.3nF network. Figure 4 in the datasheet specifies RC = 20kΩ and CC = 1500pF for 2V→3.3V conversion. An additional 100pF capacitor from VC to GND is recommended to improve noise immunity and stability near current limit.
Is LT1317BCMS8#TRPBF pin-compatible with LT1307B series devices?
Yes, LT1317BCMS8#TRPBF is explicitly stated as pin-for-pin compatible with LT1307/LT1307B in the datasheet's FEATURES section. Both share identical MS8/SO-8 pinouts, pin functions (VC, FB, SHDN, GND, SW, VIN, LBI, LBO), and recommended external component values-enabling drop-in replacement where Burst Mode is not required and low-battery detection is desired.
LT1317BCMS8#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
- Topology:
- Boost, SEPIC
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 1.5V
- Voltage - Input (Max):
- 12V
- Voltage - Output (Min/Fixed):
- 1.24V
- Voltage - Output (Max):
- 30V (Switch)
- Current - Output:
- 710mA (Switch)
- Frequency - Switching:
- 620kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-MSOP
LT1317BCMS8#TRPBF FAQ
1.How can I place an order for LT1317BCMS8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1317BCMS8#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 LT1317BCMS8#TRPBF reliable?
The price and inventory of LT1317BCMS8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1317BCMS8#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1317BCMS8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1317BCMS8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1317BCMS8#TRPBF?
LT1317BCMS8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1317BCMS8#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 LT1317BCMS8#TRPBF?
For technical support, including LT1317BCMS8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1317BCMS8#TRPBF requirements.
6.How does Aetrix verify that LT1317BCMS8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1317BCMS8#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 LT1317BCMS8#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1317BCMS8#TRPBF?
All LT1317BCMS8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1317BCMS8#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 LT1317BCMS8#TRPBF part is unused and in its original packaging.
Return procedure for LT1317BCMS8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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