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Analog Devices Inc. LT1317BIS8#PBF
- Part No.:
- LT1317BIS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1317BIS8#PBF.pdf
- Description:
- IC REG BST SEPIC ADJ 710MA 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:185
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Product details
Overview
LT1317BIS8#PBF from Analog Devices (formerly Linear Technology) is a micropower, fixed-frequency 600kHz step-up DC/DC converter optimized for industrial-grade battery-powered systems. It operates from 1.5V to 12V input, delivers up to 200mA output current, features a 1.24V feedback reference, 300mV VCE(SAT) at 500mA switch, and continuous switching mode (no Burst Mode) for ripple-sensitive applications. It is used in glucose meters and diagnostic medical instrumentation requiring stable, low-noise 3.3V/5V rail generation from single- or dual-cell alkaline or Li-ion sources.
For engineers reviewing the LT1317BIS8#PBF datasheet, LT1317BIS8#PBF pinout, LT1317BIS8#PBF application, or LT1317BIS8#PBF equivalent, key selection criteria include its industrial temperature range (–40°C to +85°C), absence of light-load Burst Mode ripple, 8-pin MSOP package, internal NPN power switch, and compatibility with ceramic output capacitors when compensated per Figure 4.
Technical Context
The LT1317BIS8#PBF implements a current-mode PWM architecture with a 600kHz oscillator and external frequency compensation via the VC pin. Its error amplifier (70–240 µmhos transconductance, 700 V/V gain) regulates output by comparing FB voltage against a 1.24V bandgap reference and controlling peak switch current through the internal NPN transistor.
Unlike the LT1317, the LT1317B variant disables Burst Mode via a lower bias point on comparator A1, ensuring continuous switching down to <50mA load - eliminating low-frequency output ripple but reducing light-load efficiency. The low-battery detector (200mV LBI threshold, open-collector LBO output) remains active during shutdown.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 600 kHz fixed - enables compact magnetics and predictable EMI filtering. |
| Input Voltage Range | 1.5 V to 12 V - supports single Li-ion (2.7–4.2 V), 2-cell alkaline (2.0–3.2 V), or wide-input industrial rails. |
| Feedback Reference | 1.24 V ±2% - sets precise output voltage via external resistor divider (e.g., 3.3 V = 1.24 × (1 + R1/R2)). |
| Switch VCE(SAT) | 300 mV at 500 mA - minimizes conduction loss and thermal rise under full load. |
| Quiescent Current | 7.5 mA (switching, VSHDN = 2 V) - defines minimum operating overhead in active mode. |
| Operating Temp | –40°C to +85°C - qualified for industrial environments without derating. |
| Shutdown Current | 40 µA - preserves battery life while retaining low-battery detection functionality. |
Pinout & Package
The LT1317BIS8#PBF is housed in an 8-lead plastic MSOP (MS8) package, 3.0 mm × 3.0 mm × 0.86 mm, 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., 33 kΩ + 3.3 nF) to set loop stability; optional 100 pF to ground improves noise immunity. |
| FB (Pin 2) | Feedback input | Monitors output via resistor divider; 1.24 V reference enables accurate regulation; trace area must be minimized to reduce noise coupling. |
| SHDN (Pin 3) | Enable/disable control | Logic-level input: ≥1.4 V enables, ≤0.4 V shuts down (only LBI/LBO remain active); draws <0.06 µA in shutdown. |
| GND (Pin 4) | Power and signal ground | Must connect directly to local ground plane; serves as return for switch, feedback, and compensation paths. |
| SW (Pin 5) | Internal NPN switch collector | Drives inductor/diode; high di/dt node - requires short, wide trace and local bypassing to limit EMI and ringing. |
| VIN (Pin 6) | Main supply input | Accepts 1.5–12 V; must be bypassed with ≥10 µF capacitor placed <5 mm from pin to prevent oscillation or regulation failure. |
| LBI (Pin 7) | Low-battery detector input | Referenced to 200 mV internal bandgap; voltage between 0–700 mV triggers LBO; bias current flows out (max 40 nA). |
| LBO (Pin 8) | Low-battery open-collector output | Sinks 10 µA when LBI < 200 mV; requires external pull-up (e.g., 1 MΩ) to system rail; active in shutdown. |
Key Features
| Feature | Design Value |
|---|---|
| Continuous switching at light loads | Eliminates low-frequency output ripple (<1 kHz) critical for analog/medical sensing circuits. |
| Industrial temperature grade | Guaranteed operation from –40°C to +85°C - suitable for portable diagnostics and field-deployed equipment. |
| Internal 500 mA NPN switch | Reduces BOM count and layout complexity; eliminates need for external MOSFET driver and gate resistor. |
| Active low-battery detector in shutdown | Enables battery monitoring during standby - essential for glucose meters and emergency medical devices. |
| External VC compensation | Allows optimization for ceramic or tantalum output caps; supports stable transient response across input/output ranges. |
Applications
| Glucose Monitoring Systems | Portable Diagnostic Instruments |
|---|---|
Use Scenario: Battery-powered handheld glucose meter operating from two AA cells (2.0–3.2 V) delivering regulated 3.3 V to ADC, microcontroller, and LCD. IC Role / Device Role / Timing Role: Primary step-up regulator providing clean, ripple-free 3.3 V rail; LBO monitors battery health to trigger low-voltage warnings before measurement errors occur. Use Value: Continuous switching avoids Burst Mode ripple that could corrupt 16-bit ADC readings; 100 µA quiescent current extends battery life beyond 1,000 tests per set. | Use Scenario: Portable ECG or pulse oximeter using single Li-ion cell (2.7–4.2 V) to generate isolated 5 V and –4 V rails for analog front-end amplifiers. IC Role / Device Role / Timing Role: Core boost converter in SEPIC or inverting topology; VC pin enables tuning for low-noise performance with ceramic capacitors. Use Value: 300 mV VCE(SAT) minimizes heat in sealed enclosure; industrial temp rating ensures accuracy across clinic and field use conditions. |
| Medical Sensor Modules | Industrial Handheld Scanners |
Use Scenario: Compact CO₂ or O₂ sensor module powered by coin cell or small Li-poly, requiring stable 3.3 V for precision analog sensors and BLE radio. IC Role / Device Role / Timing Role: Micropower DC/DC converter supplying regulated rail; LBI/LBO interface provides battery state-of-charge feedback to host MCU. Use Value: 40 µA shutdown current preserves shelf life; no Burst Mode prevents interference with sensitive electrochemical measurements. | Use Scenario: Rugged barcode scanner with dual alkaline cells (2.0–3.2 V) powering 3.3 V logic and 5 V laser driver. IC Role / Device Role / Timing Role: High-efficiency boost converter supporting pulsed 200 mA laser loads; MSOP package enables compact PCB layout. Use Value: 600 kHz switching allows use of 10 µH inductors (e.g., Sumida CD43-100); 85°C rating ensures reliability in hot warehouse environments. |
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#PBF | Includes Burst Mode operation at light loads; 100 µA quiescent current vs. 7.5 mA active IQ; same pinout and package. | Introduces low-frequency output ripple (~1–10 kHz) under <10 mA loads - unsuitable for precision analog circuits. | Select only if ultra-low idle power is prioritized over ripple performance and load is predominantly >50 mA. |
| LT3467EDD#TRPBF | Higher 1.3 MHz switching frequency; integrated Schottky diode; 2.5 V min input; different 10-pin DFN package and pinout. | Requires PCB redesign; better suited for space-constrained designs needing faster transient response and reduced inductor size. | Choose when board area is critical and input voltage ≥2.5 V; not drop-in compatible with LT1317BIS8#PBF. |
Compared with LT1317CS8#PBF, the LT1317BIS8#PBF trades light-load efficiency for ripple-free regulation - essential for medical analog front-ends. Versus LT3467EDD#TRPBF, it offers broader input range (1.5 V) and simpler external component count but requires discrete diode and larger inductor.
Availability
LT1317BIS8#PBF is available at Aetrix Electronics and suitable for glucose meters, portable diagnostic instruments, medical sensor modules, and industrial handheld scanners requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT1317BIS8#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 its legacy of high-performance analog ICs for precision power, signal conditioning, and timing applications.
The LT1317B series belongs to Linear's micropower DC/DC converter product line, designed specifically for battery-operated medical, instrumentation, and portable industrial equipment where low-noise, wide-input, and guaranteed industrial temperature operation are mandatory.
FAQ
What is the key functional difference between LT1317BIS8#PBF and LT1317IS8#PBF?
The LT1317BIS8#PBF disables Burst Mode operation to ensure continuous 600kHz switching at all load levels, eliminating low-frequency output ripple. In contrast, the LT1317IS8#PBF activates Burst Mode below ~10 mA, reducing quiescent current to 100 µA but introducing 1–10 kHz ripple. Both share identical pinout, package, and industrial temperature rating (–40°C to +85°C).
Can LT1317BIS8#PBF drive a 200mA load from a 1.5V input?
Yes, the LT1317BIS8#PBF is specified to deliver up to 200mA output current across its full 1.5V–12V input range. At 1.5V input, efficiency drops (e.g., ~65% at 100mA for 3.3V output), but regulation is maintained. Use low-DCR inductors (e.g., Sumida CD43-100) and low-ESR output capacitors to sustain performance.
Does LT1317BIS8#PBF support ceramic output capacitors?
Yes, the LT1317BIS8#PBF supports ceramic output capacitors when compensated per Figure 4 in the datasheet: RC = 20kΩ and CC = 1500pF (plus optional 100pF from VC to GND). This configuration stabilizes the loop for low-ESR ceramics and achieves optimal transient response without ringing.
What is the purpose of the LBI and LBO pins on LT1317BIS8#PBF?
The LBI (Low-Battery Input) pin connects to a resistor divider from VIN and compares against an internal 200mV reference. When LBI voltage falls below 200mV, the open-collector LBO (Low-Battery Output) pin pulls low - signaling low battery. Critically, this circuit remains fully active even when SHDN is asserted, enabling battery monitoring during system sleep.
Is LT1317BIS8#PBF pin-compatible with LT1307BIS8#PBF?
Yes, the LT1317BIS8#PBF is explicitly stated as pin-for-pin compatible with the LT1307/LT1307B family. Both use identical 8-pin MSOP pinout (VC, FB, SHDN, GND, SW, VIN, LBI, LBO) and share matching electrical characteristics for direct substitution in existing layouts - though LT1317B offers higher input voltage range (1.5–12V vs. 1.0–10V) and improved switch current capability.
LT1317BIS8#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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
LT1317BIS8#PBF FAQ
1.How can I place an order for LT1317BIS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1317BIS8#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 LT1317BIS8#PBF reliable?
The price and inventory of LT1317BIS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1317BIS8#PBF is usually 5 days.
3.What payment methods are accepted for LT1317BIS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1317BIS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1317BIS8#PBF?
LT1317BIS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1317BIS8#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 LT1317BIS8#PBF?
For technical support, including LT1317BIS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1317BIS8#PBF requirements.
6.How does Aetrix verify that LT1317BIS8#PBF is sourced from the original manufacturer or authorized distributors?
All LT1317BIS8#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 LT1317BIS8#PBF meets industry standards.
7.What is the process for return or replacement of LT1317BIS8#PBF?
All LT1317BIS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1317BIS8#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 LT1317BIS8#PBF part is unused and in its original packaging.
Return procedure for LT1317BIS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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