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Analog Devices Inc. LT1317IS8#TRPBF
- Part No.:
- LT1317IS8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1317IS8#TRPBF.pdf
- Description:
- IC REG BST SEPIC ADJ 710MA 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:3,214
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Product details
Overview
LT1317IS8#TRPBF from Analog Devices (formerly Linear Technology) is an industrial-grade, micropower, fixed-frequency 600kHz step-up DC/DC converter with automatic Burst Mode™ operation at light loads. It operates from 1.5V to 12V input, delivers up to 200mA output current, features a 1.24V feedback reference and integrated 500mA NPN switch with 300mV VCE(SAT). It is used in battery-powered medical instrumentation such as glucose meters and portable diagnostic devices.
For engineers reviewing the LT1317IS8#TRPBF datasheet, LT1317IS8#TRPBF pinout, LT1317IS8#TRPBF application, or LT1317IS8#TRPBF equivalent, key selection criteria include its 100µA quiescent current in active no-load mode, low-battery detector with 200mV threshold active during shutdown, and compatibility with ceramic or tantalum output capacitors in compact portable designs.
Technical Context
The LT1317IS8#TRPBF implements a current-mode PWM architecture with a 600kHz oscillator and ramp compensation to prevent subharmonic oscillation above 50% duty cycle. Its error amplifier (70–240 µmhos transconductance, 700 V/V gain) drives an external RC compensation network on the VC pin for loop stability across input and load variations.
Burst Mode operation-enabled only in the LT1317 variant-is triggered by the hysteretic comparator A1 when load current drops below ~300µA, reducing average quiescent current to 30µA while maintaining regulation via periodic switching bursts. The low-battery detector (200mV ±10mV reference, 2000 V/V gain) remains fully functional in shutdown, with open-collector LBO output capable of sinking 10µA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 600 kHz (fixed, ±10% over temp/voltage); enables compact magnetics and predictable EMI profile. |
| Input Voltage Range | 1.5 V to 12 V; supports single-cell alkaline, Li-ion, or multi-cell configurations without external regulators. |
| Feedback Reference | 1.24 V (±20 mV over temp); sets output voltage via resistor divider (VOUT = 1.24 × (1 + R1/R2)). |
| Quiescent Current | 100 µA (no-switching, SHDN = 2 V); ensures >1-year battery life in standby for low-duty-cycle medical sensors. |
| Switch VCE(SAT) | 300 mV at 500 mA; minimizes conduction loss and thermal rise in high-current boost stages. |
| Low-Battery Threshold | 200 mV ±10 mV; allows precise undervoltage lockout (e.g., 1.6 V cutoff for 2-cell alkaline) with active-in-shutdown monitoring. |
| Max Duty Cycle | 85%; supports high step-up ratios (e.g., 1.5 V → 5 V) while retaining control margin and stability. |
Pinout & Package
LT1317IS8#TRPBF is housed in an 8-lead plastic SO (Small Outline) package (S8), 0.150" narrow body, with θJA = 120°C/W. Pin 1 is VC (compensation), Pin 2 is FB (feedback), Pin 3 is SHDN (shutdown), Pin 4 is GND, Pin 5 is SW (switch), Pin 6 is VIN (input supply), Pin 7 is LBI (low-battery input), and Pin 8 is LBO (low-battery output).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VC (Pin 1) | Compensation node for error amplifier | Connects external RC network (e.g., 33 kΩ + 3.3 nF); determines loop bandwidth and phase margin. |
| FB (Pin 2) | Inverting input of error amplifier | Monitors output via resistor divider; 1.24 V reference sets regulated output voltage. |
| SHDN (Pin 3) | Logic-level enable/disable control | Pull ≤0.4 V for shutdown (only LBI/LBO active); float or tie ≥1.4 V for normal operation. |
| GND (Pin 4) | Power and signal reference ground | Must connect directly to local ground plane; shared return for switch, feedback, and bias paths. |
| SW (Pin 5) | Collector of internal NPN power switch | Drives inductor/diode node; requires short, low-inductance trace to minimize EMI and switching loss. |
| VIN (Pin 6) | Main power input | Must be bypassed with ≥10 µF capacitor placed <5 mm from pin to suppress input ripple and ensure startup. |
| LBI (Pin 7) | Low-battery detector input | Accepts voltage divider from battery; 200 mV threshold triggers LBO when battery falls below set point. |
| LBO (Pin 8) | Open-collector low-battery output | Sinks 10 µA max; requires external pull-up (e.g., 1 MΩ) to signal host processor or enable backup circuitry. |
Key Features
| Feature | Design Value |
|---|---|
| Automatic Burst Mode™ at light loads | Maintains regulation down to 300 µA load while reducing average IQ to 30 µA-critical for long-life battery applications. |
| Integrated 500 mA NPN switch with 300 mV VCE(SAT) | Eliminates external transistor; enables high-efficiency boost conversion without discrete switch losses or layout complexity. |
| Active low-battery detector in shutdown | Provides continuous battery monitoring even when converter is disabled-enables graceful system shutdown before brownout. |
| External frequency compensation (VC pin) | Allows optimization of transient response and stability for diverse output capacitors (tantalum, ceramic, polymer) and loads. |
| Pin-for-pin compatible with LT1307/LT1307B | Enables drop-in upgrade path from single-cell to wider-input-range boost converters without PCB redesign. |
Applications
| Glucose Monitoring Systems | Portable Diagnostic Instruments |
|---|---|
|
Use Scenario: Battery-powered handheld glucose meter operating from two AA cells (1.8–3.2 V) delivering stable 3.3 V to ADC, microcontroller, and display. IC Role / Device Role / Timing Role: Primary step-up regulator providing regulated rail; Burst Mode extends battery life between tests. Use Value: 100 µA quiescent current and active low-battery detection allow >2-year shelf life and accurate end-of-battery warnings. |
Use Scenario: Portable ECG or pulse oximeter using single Li-ion cell (2.7–4.2 V) to generate 5 V for analog front-end and Bluetooth radio. IC Role / Device Role / Timing Role: High-efficiency boost converter with tight line/load regulation (0.15 %/V line regulation) ensuring sensor accuracy. Use Value: 600 kHz fixed frequency enables small 10 µH inductor; 300 mV VCE(SAT) maintains >85% efficiency at 150 mA load. |
| Cordless Telephone Base Stations | GPS Receivers |
|
Use Scenario: Mains-powered cordless phone base station requiring 3.3 V rail for RF module and MCU during standby and talk modes. IC Role / Device Role / Timing Role: Standby power manager; SHDN pin enables deep-sleep mode synchronized with system activity. Use Value: 30 µA shutdown current minimizes wall-adapter energy waste; LBO output signals battery backup status to MCU. |
Use Scenario: Compact GPS tracker powered by coin cell or small Li-ion, needing 3.3 V for GNSS receiver and uC under variable load (1–100 mA). IC Role / Device Role / Timing Role: Micropower voltage booster with fast transient response (<500 µs settling) to handle bursty GPS acquisition. Use Value: External VC compensation allows tuning for low-ESR ceramic caps; 85% peak efficiency sustains runtime during cold-start acquisition. |
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 |
|---|---|---|---|
| LT1317CS8#TRPBF | Commercial-grade (0°C to 70°C), identical electrical specs and pinout; lower temperature rating and slightly looser VFB tolerance (±20 mV vs. ±10 mV). | Not rated for industrial environments; unsuitable for medical or automotive applications requiring extended temperature operation. | Select LT1317IS8#TRPBF for systems deployed in uncontrolled ambient conditions (e.g., field-deployed diagnostics). |
| LT1317BIS8#TRPBF | Industrial-grade but disables Burst Mode; operates continuously at light loads, eliminating low-frequency output ripple at expense of higher 7.5 mA quiescent current. | Preferred where output ripple sensitivity outweighs battery life (e.g., precision analog signal chains), not for ultra-low-power sensing. | Choose LT1317BIS8#TRPBF only if Burst Mode ripple is unacceptable and light-load efficiency is secondary. |
Compared with LT1317CS8#TRPBF, the LT1317IS8#TRPBF offers guaranteed performance over –40°C to +85°C and tighter feedback reference accuracy-essential for medical reliability. Versus LT1317BIS8#TRPBF, it trades higher light-load efficiency for regulated ripple-free output, making it optimal for battery-constrained portable instrumentation.
Availability
LT1317IS8#TRPBF is available at Aetrix Electronics and suitable for glucose meters, portable diagnostic instruments, and GPS receivers requiring stable component supply across industrial temperature ranges and long product lifecycles.
Supply support for LT1317IS8#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 continues to manufacture and support its high-performance analog and power management portfolio.
The LT1317 series was designed specifically for micropower, wide-input-voltage boost conversion in space- and battery-constrained portable electronics-emphasizing low IQ, robust low-battery monitoring, and ease of compensation.
FAQ
What is the operating temperature range of the LT1317IS8#TRPBF?
The LT1317IS8#TRPBF is rated for industrial temperature operation from –40°C to +85°C. This specification is guaranteed per the datasheet's Electrical Characteristics table for Industrial Grade, making it suitable for deployment in medical devices, outdoor instrumentation, and industrial handheld tools where ambient conditions exceed commercial-grade limits.
Does the LT1317IS8#TRPBF support ceramic output capacitors?
Yes, the LT1317IS8#TRPBF supports ceramic output capacitors, but requires adjusted compensation. Figure 4 in the datasheet shows a validated 2V-to-3.3V design using a 10µF ceramic cap with RC values of 20kΩ and 1500pF. Stability must be verified across temperature and load due to ceramic capacitance variation and near-zero ESR.
How does the low-battery detector function in shutdown mode for the LT1317IS8#TRPBF?
The low-battery detector in the LT1317IS8#TRPBF remains fully active during shutdown: the 200mV reference and LBI/LBO circuitry continue operating with only 30µA total current draw. When LBI voltage falls below threshold, LBO pulls low-enabling host processors to initiate controlled shutdown before system brownout.
What is the maximum recommended inductor value for the LT1317IS8#TRPBF?
The LT1317IS8#TRPBF is optimized for 10µH inductors (e.g., Sumida CD43-100), but supports values up to 22µH per typical applications (Figures TA02, TA09). Larger inductors reduce peak switch current and ripple but increase size and may degrade transient response; values beyond 22µH risk instability or failure to start under light loads.
Is the LT1317IS8#TRPBF pin-compatible with the LT1307 series?
Yes, the LT1317IS8#TRPBF is explicitly pin-for-pin compatible with the LT1307 and LT1307B per the datasheet's "Pin for Pin Compatible" feature. This allows direct replacement in existing layouts, though designers must verify input voltage range (LT1307: 1.0–10V; LT1317: 1.5–12V) and Burst Mode behavior matches system requirements.
LT1317IS8#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
- 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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LT1317IS8#TRPBF FAQ
1.How can I place an order for LT1317IS8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1317IS8#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 LT1317IS8#TRPBF reliable?
The price and inventory of LT1317IS8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1317IS8#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1317IS8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1317IS8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1317IS8#TRPBF?
LT1317IS8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1317IS8#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 LT1317IS8#TRPBF?
For technical support, including LT1317IS8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1317IS8#TRPBF requirements.
6.How does Aetrix verify that LT1317IS8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1317IS8#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 LT1317IS8#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1317IS8#TRPBF?
All LT1317IS8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1317IS8#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 LT1317IS8#TRPBF part is unused and in its original packaging.
Return procedure for LT1317IS8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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