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Analog Devices Inc. LT1317BCS8#TRPBF
- Part No.:
- LT1317BCS8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1317BCS8#TRPBF.pdf
- Description:
- IC REG BST SEPIC ADJ 710MA 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:4,671
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Product details
Overview
LT1317BCS8#TRPBF from Analog Devices (formerly Linear Technology) is a micropower, fixed-frequency 600kHz step-up DC/DC converter optimized for battery-powered systems requiring high light-load efficiency trade-offs. It operates from 1.5V to 12V input, delivers up to 200mA output current, features a 1.24V feedback reference, and uses an internal 500mA NPN switch with 300mV VCE(SAT). It is used in glucose meters and portable medical instrumentation where continuous switching at light loads eliminates low-frequency output ripple.
For engineers reviewing the LT1317BCS8#TRPBF datasheet, LT1317BCS8#TRPBF pinout, LT1317BCS8#TRPBF application, or LT1317BCS8#TRPBF equivalent, key selection criteria include its non-Burst Mode operation (vs. LT1317), 300mV switch saturation voltage, 1.24V feedback threshold, SO-8 package compatibility, and integrated low-battery detector with 200mV reference active in shutdown.
Technical Context
The LT1317BCS8#TRPBF implements a current-mode PWM architecture with fixed 600kHz oscillator frequency and no automatic Burst Mode transition-ensuring continuous switching across all load conditions. Its error amplifier (70–240 µmhos transconductance, 700 V/V gain) drives an external RC compensation network on the VC pin to stabilize the control loop against varying input voltage and output capacitance.
It integrates a low-battery detector with 200mV ±10mV reference and open-collector LBO output, remaining functional during shutdown. The SHDN pin accepts logic-level enable (1.4V–6V high, ≤0.4V low), and the internal NPN switch supports peak currents up to 1350mA (typ.) with duty cycle-dependent current limiting.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 600 kHz fixed-enables compact magnetics and predictable EMI profile. |
| Input Voltage Range | 1.5 V to 12 V-supports single-cell Li-ion (2.7–4.2 V), dual alkaline (2.0–3.2 V), and wide industrial rails. |
| Feedback Reference | 1.24 V ±20 mV-sets output voltage via resistor divider (VOUT = 1.24 × (1 + R1/R2)). |
| Switch VCE(SAT) | 300 mV at 500 mA-minimizes conduction loss and improves efficiency at medium loads. |
| Quiescent Current | 7.5 mA typical during switching-higher than LT1317 (100 µA) due to absence of Burst Mode. |
| Low-Battery Threshold | 200 mV ±10 mV-stable reference remains active in shutdown for battery monitoring without wake-up. |
| Max Duty Cycle | 85%-enables high step-up ratios (e.g., 1.5 V → 5 V) while maintaining stability. |
Pinout & Package
LT1317BCS8#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) to set loop bandwidth and phase margin. |
| FB (Pin 2) | Feedback input to error amplifier | Monitors output via resistor divider; 1.24 V reference enables precise regulation independent of temperature drift. |
| SHDN (Pin 3) | Logic-level enable/disable control | Pull ≤0.4 V to enter shutdown (only LBI/LBO active); float or apply 1.4–6 V to enable. |
| GND (Pin 4) | Power and signal ground reference | 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 external inductor/diode; high di/dt requires minimized trace area to reduce EMI. |
| VIN (Pin 6) | Main input supply connection | Requires local ceramic bypass capacitor (<5 mm distance) to suppress switching noise and ensure regulation. |
| LBI (Pin 7) | Low-battery detector input | Accepts scaled battery voltage; comparator triggers when LBI < 200 mV (±10 mV), with bias current <40 nA. |
| LBO (Pin 8) | Open-collector low-battery output | Sinks ≥10 µA when triggered; requires external pull-up (e.g., 1 MΩ) to system rail for processor interrupt. |
Key Features
| Feature | Design Value |
|---|---|
| Continuous switching at light loads | Eliminates low-frequency output ripple (vs. LT1317's Burst Mode), critical for noise-sensitive analog circuits. |
| Integrated low-battery detector | 200 mV reference stays active in shutdown-enables battery monitoring without waking main converter. |
| External frequency compensation | VC pin allows tuning of transient response and stability across input/output variations and capacitor ESR ranges. |
| Pin-for-pin compatible with LT1307B | Enables drop-in upgrade path from single-cell boost converters without PCB redesign. |
| SO-8 package with 120°C/W thermal resistance | Supports industrial temperature range (–40°C to +85°C) and simplifies assembly vs. MSOP alternatives. |
Applications
| Glucose Meters | Portable Diagnostic Instruments |
|---|---|
Use Scenario: Battery-powered handheld device measuring blood glucose concentration using electrochemical sensor requiring stable 3.3 V and 5 V rails. IC Role / Device Role / Timing Role: Step-up DC/DC converter generating regulated 3.3 V from single Li-ion cell (2.7–4.2 V), with continuous switching to avoid interference with analog front-end measurements. Use Value: 300 mV VCE(SAT) and 1.24 V feedback reference ensure <±1% output accuracy over temperature and load, critical for ADC reference stability. | Use Scenario: Portable ultrasound or ECG monitor powered by two AA cells (2.0–3.2 V), needing clean 5 V for microcontroller and 3.3 V for signal chain. IC Role / Device Role / Timing Role: Primary boost regulator delivering 200 mA at 5 V with minimal output ripple, leveraging SO-8 thermal performance for sustained operation. Use Value: Low-battery detector (200 mV threshold) provides early warning before sensor calibration drift occurs, extending usable battery life per charge. |
| GPS Receivers | Battery Backup Systems |
Use Scenario: Compact GPS module in asset tracker operating from coin cell or Li-ion, requiring ultra-low-noise 3.3 V supply for RF front-end and baseband IC. IC Role / Device Role / Timing Role: Fixed-frequency 600 kHz boost converter powering GPS receiver IC; continuous mode avoids subharmonic coupling into sensitive RF bands. Use Value: Absence of Burst Mode eliminates ~1–10 kHz ripple that could desensitize GPS L1 band (1.575 GHz) through power-supply modulation. | Use Scenario: Real-time clock (RTC) backup circuit maintaining SRAM and timekeeping during main power failure, powered by supercapacitor or backup battery. IC Role / Device Role / Timing Role: Micropower boost converter sustaining 3.3 V rail from depleted 1.5 V backup source, with shutdown control synchronized to system power-loss detection. Use Value: SHDN pin logic-level interface and active-low LBO output allow direct connection to microcontroller GPIO for autonomous backup activation and status reporting. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1317CS8#TRPBF | Includes Burst Mode operation; 100 µA quiescent current vs. 7.5 mA; same pinout and package. | Superior light-load efficiency but introduces low-frequency output ripple unsuitable for noise-sensitive analog loads. | Select LT1317CS8#TRPBF only when battery runtime at microamp loads outweighs ripple sensitivity. |
| LT1307BCS8#TRPBF | Single-cell optimized (1.5–10 V input); lower max output current (75 mA); identical 600 kHz frequency and SO-8 footprint. | Targeted for ultra-low-power devices like pagers; insufficient for 200 mA glucose meter loads. | Choose LT1307BCS8#TRPBF only for space-constrained, sub-100 mA applications where cost and size dominate. |
Compared with LT1317CS8#TRPBF, LT1317BCS8#TRPBF sacrifices light-load efficiency for ripple-free output; compared with LT1307BCS8#TRPBF, it trades single-cell optimization for higher output current capability and broader input range-making it optimal for 200 mA medical and industrial boost needs.
Availability
LT1317BCS8#TRPBF is available at Aetrix Electronics and suitable for glucose meters, portable diagnostic instruments, GPS receivers, and battery backup systems requiring stable component supply, long-term manufacturability, and industrial temperature support.
Supply support for LT1317BCS8#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, datasheet documentation, and application engineering for legacy Linear parts including the LT1317 series.
The LT1317 family was designed specifically for micropower, wide-input-voltage boost conversion in portable medical, instrumentation, and communications equipment-emphasizing integration, low-noise operation, and robust battery monitoring.
FAQ
What is the key functional difference between LT1317BCS8#TRPBF and LT1317CS8#TRPBF?
The LT1317BCS8#TRPBF disables Burst Mode operation, ensuring continuous 600 kHz switching even at light loads-eliminating low-frequency output ripple but increasing quiescent current to 7.5 mA. In contrast, LT1317CS8#TRPBF activates Burst Mode below ~300 µA load, reducing IQ to 100 µA at the cost of ~1–10 kHz ripple. Both share identical pinout, SO-8 package, and 1.24 V feedback reference. LT1317BCS8#TRPBF is preferred for noise-critical analog applications like glucose meters.
Can LT1317BCS8#TRPBF operate from a single 1.5 V alkaline cell?
Yes, LT1317BCS8#TRPBF supports input voltages as low as 1.5 V, enabling startup and regulation from a fresh single alkaline cell (1.5–1.6 V). However, output current capability decreases as VIN drops; at 1.5 V input, maximum continuous output is ~50 mA for 3.3 V output. For higher loads, dual-cell (2.0–3.2 V) or Li-ion (2.7–4.2 V) sources are recommended. The LT1317BCS8#TRPBF datasheet confirms operation down to 1.5 V across commercial and industrial temperature ranges.
What is the purpose of the VC pin on LT1317BCS8#TRPBF, and how should it be configured?
VC (Pin 1) is the error amplifier compensation node on LT1317BCS8#TRPBF. It must be connected to an external series RC network (e.g., 33 kΩ + 3.3 nF) tied to ground to set loop stability and transient response. An optional 100 pF capacitor from VC to ground improves noise immunity. Incorrect RC values cause oscillation or sluggish regulation-Figure 1 in the LT1317B datasheet shows validated values for 3.3 V and 5 V outputs. The LT1317BCS8#TRPBF requires this network for reliable operation across input voltage and load variations.
Does LT1317BCS8#TRPBF include a low-battery detector, and how is it used?
Yes, LT1317BCS8#TRPBF integrates a low-battery detector with a precise 200 mV ±10 mV internal reference. The LBI (Pin 7) accepts a scaled battery voltage (e.g., via resistor divider), and LBO (Pin 8) asserts low when LBI falls below threshold. Critically, this detector remains active during shutdown-allowing battery monitoring without powering the main converter. A 1 MΩ pull-up on LBO enables direct GPIO interrupt to a microcontroller. This feature is fully documented in the LT1317BCS8#TRPBF datasheet's Applications Information section.
Is LT1317BCS8#TRPBF pin-compatible with other Linear Technology boost converters?
Yes, LT1317BCS8#TRPBF is pin-for-pin compatible with LT1307B and LT1317 variants in the SO-8 (S8) package, including LT1317CS8#TRPBF and LT1317IS8. This allows direct substitution in existing designs without layout changes. However, electrical differences-such as Burst Mode presence (LT1317C), input voltage range (LT1307B limited to 10 V), or temperature grade-must be verified. The LT1317BCS8#TRPBF datasheet explicitly states "Pin for Pin Compatible with the LT1307/LT1307B" in its Features list.
LT1317BCS8#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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LT1317BCS8#TRPBF FAQ
1.How can I place an order for LT1317BCS8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1317BCS8#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 LT1317BCS8#TRPBF reliable?
The price and inventory of LT1317BCS8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1317BCS8#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1317BCS8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1317BCS8#TRPBF transactions.
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4.How is shipping managed for LT1317BCS8#TRPBF?
LT1317BCS8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1317BCS8#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 LT1317BCS8#TRPBF?
For technical support, including LT1317BCS8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1317BCS8#TRPBF requirements.
6.How does Aetrix verify that LT1317BCS8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1317BCS8#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 LT1317BCS8#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1317BCS8#TRPBF?
All LT1317BCS8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1317BCS8#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 LT1317BCS8#TRPBF part is unused and in its original packaging.
Return procedure for LT1317BCS8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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