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Analog Devices Inc. LT1317CS8#TRPBF
- Part No.:
- LT1317CS8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1317CS8#TRPBF.pdf
- Description:
- IC REG BST SEPIC ADJ 710MA 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:4,708
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Product details
Overview
LT1317CS8#TRPBF from Analog Devices (formerly Linear Technology) is a micropower, fixed-frequency 600kHz step-up DC/DC converter with internal NPN switch, 1.24V feedback reference, and integrated low-battery detector. It operates from 1.5V to 12V input, delivers up to 200mA output current, maintains 100µA quiescent current in no-load operation, and supports Burst Mode™ for high light-load efficiency. It is used in battery-powered medical devices like glucose meters and portable diagnostic instrumentation.
For engineers reviewing the LT1317CS8#TRPBF datasheet, LT1317CS8#TRPBF pinout, LT1317CS8#TRPBF application, or LT1317CS8#TRPBF equivalent, key selection criteria include its 1.24V FB reference accuracy, 300mV VCE(SAT) at 500mA, automatic Burst Mode switching (LT1317 variant), active low-battery detection during shutdown, and SO-8 package compatibility with LT1307/LT1307B designs.
Technical Context
The LT1317CS8#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 to stabilize the control loop across input and load variations.
Burst Mode operation-enabled only in the LT1317 (not LT1317B)-reduces average supply current to 100µA at light loads by gating full switching cycles, while maintaining regulation via periodic 250mA peak switch pulses. The low-battery detector uses a 200mV ±5% internal reference and remains functional during shutdown, with open-collector LBO output sinking 10µA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 600 kHz fixed (520–720 kHz typical range); enables compact magnetics and predictable EMI filtering. |
| Feedback Voltage | 1.24 V (±20 mV); sets output voltage via resistor divider: VOUT = 1.24V × (1 + R1/R2). |
| Quiescent Current | 100 µA (no-switching, SHDN = 2V); ensures >1-year battery life in always-on low-power monitoring circuits. |
| Switch VCE(SAT) | 300 mV at 500 mA; minimizes conduction loss and thermal rise in boost switch path. |
| Input Voltage Range | 1.5 V to 12 V; supports single-cell alkaline (1.5V), Li-ion (2.7–4.2V), and dual-cell NiMH (2.4V) sources without external regulators. |
| Low-Battery Threshold | 200 mV ±10 mV on LBI pin; allows precise undervoltage lockout (e.g., 1.6V cutoff for 2-cell alkaline) with active-in-shutdown functionality. |
| Max Duty Cycle | 85%; supports high step-up ratios (e.g., 1.5V → 5V) while retaining stable current-mode control. |
Pinout & Package
LT1317CS8#TRPBF is housed in an 8-lead plastic SO (Small Outline) package (S8), 0.150" wide, with standard SOIC pin spacing (1.27 mm pitch) and 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), 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 to external RC network (e.g., 33kΩ + 3.3nF) to set loop bandwidth and phase margin; optional 100pF to ground improves noise immunity. |
| FB (Pin 2) | Inverting input of error amplifier | Monitors output via resistor divider; 1.24V reference ensures accurate output regulation; low bias current (12–60 nA) minimizes divider error. |
| SHDN (Pin 3) | Enable/disable control input | Logic-level input: ≥1.4V enables, ≤0.4V disables; draws <0.1 µA when pulled to VIN, enabling direct microcontroller GPIO drive. |
| GND (Pin 4) | Power and signal reference | Must connect directly to local ground plane; shared return for switch, feedback, and shutdown paths to avoid noise coupling. |
| SW (Pin 5) | Collector of internal NPN power switch | Drives external inductor/diode; high dv/dt requires short, low-inductance trace routing to minimize EMI and ringing. |
| VIN (Pin 6) | Main power input | Requires local 10µF ceramic bypass capacitor placed <5 mm away to suppress switching transients and ensure stable startup. |
| LBI (Pin 7) | Low-battery detector input | Accepts divided battery voltage; 200mV threshold with ±10mV tolerance; bias current flows out (5–40 nA), affecting divider design. |
| LBO (Pin 8) | Open-collector low-battery output | Sinks 10µA when LBI < 200mV; requires external pull-up (e.g., 1MΩ) to system rail; remains active during shutdown. |
Key Features
| Feature | Design Value |
|---|---|
| Automatic Burst Mode operation | Maintains regulation at 300µA–200mA load while reducing average IQ to 100µA-critical for multi-year battery life in glucose meters. |
| Integrated low-battery detector with 200mV reference | Enables precise, shutdown-aware battery monitoring without external comparators-reducing BOM count in portable diagnostics. |
| 100µA no-load quiescent current | Allows continuous operation from coin cells (e.g., CR2032) in standby mode without premature depletion. |
| 300mV VCE(SAT) at 500mA | Minimizes power loss and thermal stress in the internal switch, supporting reliable 200mA output even at elevated ambient temperatures. |
| Pin-for-pin compatibility with LT1307/LT1307B | Enables drop-in upgrade from single-cell to wider-input-range boost converters without PCB redesign. |
Applications
| Glucose Meters | Portable Diagnostic Instruments |
|---|---|
Use Scenario: Battery-powered handheld device measuring blood glucose concentration using electrochemical test strips. IC Role / Device Role / Timing Role: Step-up converter generating stable 3.3V or 5V rail from single alkaline or Li-ion cell for analog front-end, MCU, and display. Use Value: Burst Mode extends battery life beyond 1,000 tests per set of AA cells; low 100µA IQ ensures calendar life retention during storage. | Use Scenario: Field-deployable point-of-care analyzer performing rapid immunoassays or nucleic acid detection. IC Role / Device Role / Timing Role: Primary DC/DC regulator powering precision ADCs, temperature sensors, and wireless transceivers from variable-input battery packs. Use Value: Active low-battery detector (LBI/LBO) triggers graceful shutdown before critical measurement errors occur; 1.5V start-up supports partially discharged batteries. |
| Cordless Telephones | GPS Receivers |
Use Scenario: Handset requiring regulated 3.3V supply for RF transceiver and audio codec during intermittent transmit/receive bursts. IC Role / Device Role / Timing Role: Efficient boost converter delivering 200mA peak current with minimal output ripple during RF transmission events. Use Value: 600kHz fixed frequency simplifies EMI filter design; low 300mV VCE(SAT) prevents thermal throttling during sustained talk time. | Use Scenario: Portable GPS tracker operating from two AA cells in cold environments where battery voltage sags below 2.0V. IC Role / Device Role / Timing Role: Input-wide boost regulator sustaining 3.3V output down to 1.5V input, enabling operation through full battery discharge curve. Use Value: 1.5V minimum input and 85% max duty cycle allow uninterrupted GPS lock even at 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 |
|---|---|---|---|
| LT1317BCS8#TRPBF | No Burst Mode; continuous 600kHz switching at all loads; higher light-load IQ (~7.5 mA vs. 100 µA) | Eliminates low-frequency output ripple but sacrifices battery runtime in always-on sensing nodes | Select when ultra-low output ripple is prioritized over battery life-e.g., RF-sensitive GPS receivers. |
| LT1307CS8#TRPBF | Single-cell optimized (1.5V–6V input); no low-battery detector; lower max output current (75mA) | Lacks LBI/LBO functionality and cannot support wide-input applications like dual-cell alkaline or Li-ion | Select only for cost-sensitive, single-cell-only designs where battery monitoring is handled externally. |
Compared with LT1317BCS8#TRPBF, LT1317CS8#TRPBF trades light-load efficiency for ripple-free operation; compared with LT1307CS8#TRPBF, it adds low-battery detection and supports higher input voltages and output currents-making it suitable for broader portable medical and industrial applications.
Availability
LT1317CS8#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 lifecycle support, and guaranteed authentic sourcing.
Supply support for LT1317CS8#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 IC portfolio.
The LT1317CS8#TRPBF belongs to Linear's micropower DC/DC converter product line, designed specifically for battery-powered portable equipment demanding high efficiency across wide load ranges and robust system-level features like integrated battery monitoring.
FAQ
What is the minimum input voltage required for LT1317CS8#TRPBF to start switching?
The LT1317CS8#TRPBF starts switching at an input voltage as low as 1.5V. This capability enables reliable operation from partially discharged alkaline or NiMH cells, making LT1317CS8#TRPBF ideal for portable medical devices that must function across the full battery discharge curve without external pre-regulation.
Does LT1317CS8#TRPBF support Burst Mode operation, and how does it affect efficiency?
Yes, LT1317CS8#TRPBF supports Burst Mode operation at light loads (≤300µA), reducing quiescent current to 100µA and maintaining >70% efficiency down to 300µA. This feature significantly extends battery life in intermittently active applications such as glucose meters and portable diagnostics, where standby current dominates total energy consumption.
What is the purpose of the LBI and LBO pins on LT1317CS8#TRPBF, and how are they used?
The LBI (Pin 7) and LBO (Pin 8) pins implement a low-battery detector with a 200mV internal reference. LBI accepts a scaled battery voltage; when it falls below 200mV, LBO pulls low. Crucially, this circuit remains active during shutdown, allowing LT1317CS8#TRPBF to provide battery status even when the main converter is disabled-enabling fail-safe shutdown in medical devices.
Can LT1317CS8#TRPBF be used with ceramic output capacitors, and what compensation changes are needed?
Yes, LT1317CS8#TRPBF supports ceramic output capacitors, but requires adjusted compensation: reduce RC network values (e.g., 20kΩ + 1500pF instead of 33kΩ + 3.3nF) and add a 100pF capacitor from VC to ground to maintain stability. This adjustment compensates for the ceramic cap's near-zero ESR, preventing control-loop oscillation while preserving fast transient response.
Is LT1317CS8#TRPBF pin-compatible with other members of the LT13xx family?
Yes, LT1317CS8#TRPBF is pin-for-pin compatible with LT1307/LT1307B in the SO-8 package, enabling direct replacement in existing designs. However, functional differences exist: LT1317CS8#TRPBF adds low-battery detection and supports wider input voltage (1.5–12V vs. 1.5–6V), so validation of LBI/LBO integration and output stage stability is recommended.
LT1317CS8#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
LT1317CS8#TRPBF FAQ
1.How can I place an order for LT1317CS8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1317CS8#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 LT1317CS8#TRPBF reliable?
The price and inventory of LT1317CS8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1317CS8#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1317CS8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1317CS8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1317CS8#TRPBF?
LT1317CS8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1317CS8#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 LT1317CS8#TRPBF?
For technical support, including LT1317CS8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1317CS8#TRPBF requirements.
6.How does Aetrix verify that LT1317CS8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1317CS8#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 LT1317CS8#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1317CS8#TRPBF?
All LT1317CS8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1317CS8#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 LT1317CS8#TRPBF part is unused and in its original packaging.
Return procedure for LT1317CS8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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