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Analog Devices Inc. LT1317CMS8#PBF
- Part No.:
- LT1317CMS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LT1317CMS8#PBF.pdf
- Description:
- IC REG BST SEPIC ADJ 710MA 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:333
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Product details
Overview
LT1317CMS8#PBF 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, features 100µA quiescent current and automatic Burst Mode™ operation at light loads, and integrates a low-battery detector with 200mV reference - used in battery-powered medical instrumentation and portable electronics.
For engineers reviewing the LT1317CMS8#PBF datasheet, LT1317CMS8#PBF pinout, LT1317CMS8#PBF application, or LT1317CMS8#PBF equivalent, key selection criteria include its 1.24V feedback voltage, 300mV VCE(SAT) at 500mA, Burst Mode ripple behavior, shutdown pin logic thresholds (1.4V high / 0.4V low), and compatibility with ceramic or tantalum output capacitors in space-constrained designs.
Technical Context
The LT1317CMS8#PBF employs current-mode PWM control with a 600kHz oscillator and internal ramp compensation to prevent subharmonic oscillation above 50% duty cycle. Its error amplifier (70–240 µmhos transconductance, 700 V/V gain) drives the VC pin for external RC compensation, enabling stable regulation across input voltages from 1.5V to 12V and load currents from 300µA to 200mA.
Burst Mode operation-enabled only in the LT1317 variant (not LT1317B)-reduces average quiescent current to 30µA in shutdown while maintaining low-battery detection functionality. The integrated NPN switch exhibits 300mV saturation voltage at 500mA and supports peak currents up to 800mA under specified conditions, with switching limited to ≤85% duty cycle.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 600 kHz ±10% - enables compact magnetics and filtering; stable over temperature and input voltage. |
| Feedback Voltage | 1.24 V ±20 mV - sets output via resistor divider; determines accuracy of regulated VOUT = 1.24V × (1 + R1/R2). |
| Quiescent Current | 100 µA (active, no switching); 30 µA (shutdown) - critical for multi-year battery life in glucose meters and pagers. |
| 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 alkaline, Li-ion, or multi-cell configurations without external regulators. |
| Low-Battery Threshold | 200 mV ±10 mV on LBI pin - enables precise undervoltage lockout with external resistor divider. |
| Shutdown Logic Threshold | 1.4 V (min high), 0.4 V (max low) - compatible with CMOS/LVTTL logic; allows direct microcontroller control. |
Pinout & Package
LT1317CMS8#PBF is housed in an 8-lead MSOP (MS8) package, 3.0 mm × 3.0 mm × 0.86 mm, with exposed pad for thermal enhancement (θJA = 160°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 open-collector 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 stabilize loop; sensitive to noise - minimize trace area. |
| FB (Pin 2) | Feedback input to error amplifier | References internal 1.24V bandgap; connects to resistor divider tap - trace must be short and isolated to avoid noise injection. |
| SHDN (Pin 3) | Enable/disable control input | Logic-level input: ≥1.4V enables, ≤0.4V disables; draws <0.1µA when pulled to VIN or GND. |
| GND (Pin 4) | Power and signal ground reference | Must connect directly to local ground plane; serves as return for switch, feedback, and bias currents. |
| SW (Pin 5) | Collector of internal NPN power switch | Drives external inductor/diode; high di/dt node - minimize trace length and loop area to reduce EMI. |
| VIN (Pin 6) | Main input supply connection | Requires local 10µF bypass capacitor placed <5mm away; ESR impacts startup and regulation stability. |
| LBI (Pin 7) | Low-battery detector input | Accepts divided battery voltage; 200mV internal reference remains active during shutdown; bias current <80nA. |
| LBO (Pin 8) | Open-collector low-battery output | Sinks up to 10µA; requires external pull-up (e.g., 1MΩ) to indicate battery depletion to host system. |
Key Features
| Feature | Design Value |
|---|---|
| Micropower Burst Mode™ operation | Maintains regulation at 300µA–200mA loads while holding quiescent current to 100µA (active) or 30µA (shutdown), extending battery life in intermittent-use devices. |
| Integrated low-battery detector | 200mV reference stays active in shutdown mode, enabling host systems to monitor battery health without waking the converter. |
| High-efficiency NPN switch | 300mV VCE(SAT) at 500mA reduces conduction loss and thermal stress, allowing full-load operation from 1.5V input in compact layouts. |
| External frequency compensation | VC pin supports tailored loop response via RC network - enables optimization for ceramic (low-ESR) or tantalum (higher-ESR) output capacitors. |
| PIN-compatible upgrade path | Direct replacement for LT1307/LT1307B in existing designs, supporting migration to higher current or lower IQ requirements without PCB changes. |
Applications
| Glucose Meters | Portable Diagnostic Instruments |
|---|---|
Use Scenario: Handheld blood glucose analyzers powered by two AAA alkaline cells (1.8–3.2V), requiring stable 3.3V rail for ADC, microcontroller, and LCD. IC Role / Device Role / Timing Role: Step-up DC/DC converter generating regulated 3.3V output; Burst Mode maintains efficiency during standby between measurements. Use Value: 100µA quiescent current extends battery life beyond 2 years; low-battery detector triggers alert before test strip calibration fails. | Use Scenario: Battery-operated point-of-care ultrasound or ECG units using single Li-ion cell (2.7–4.2V), needing clean 5V for analog front-end and digital logic. IC Role / Device Role / Timing Role: Primary boost regulator delivering 5V/250mA; integrated LBO pin signals host MCU when battery drops below 3.0V. Use Value: 300mV VCE(SAT) minimizes dropout at end-of-discharge; MSOP package fits tight board space near sensor interface. |
| Cordless Telephones | GPS Receivers |
Use Scenario: DECT cordless phone base station with rechargeable NiMH pack (7.2–9.6V), powering RF transceiver and audio codec from 3.3V rail. IC Role / Device Role / Timing Role: Fixed-frequency boost converter supplying low-noise 3.3V; Burst Mode eliminates audible switching ripple during idle periods. Use Value: 600kHz switching avoids AM radio band interference; SHDN pin enables fast turn-on/off synchronized with call signaling. | Use Scenario: Portable GPS tracker using coin-cell or CR2032 (2.0–3.0V), requiring 3.3V for GNSS module and Bluetooth LE radio. IC Role / Device Role / Timing Role: Micropower boost converter operating down to 1.5V input; LBI/LBO circuit provides early warning of battery exhaustion. Use Value: 1.5V start capability ensures operation until battery reaches 1.6V cutoff; 30µA shutdown current preserves charge during long sleep cycles. |
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 |
|---|---|---|---|
| LT1317BCMS8#PBF | No Burst Mode - continuous 600kHz switching at all loads; higher light-load IQ (7.5mA vs. 100µA). | Eliminates low-frequency output ripple but sacrifices >10× light-load efficiency; preferred where ripple-sensitive analog circuits are present. | Select when output ripple <10mVPP is mandatory at 1–10mA loads, and battery life is secondary to signal integrity. |
| LT1307CMS8#PBF | Lower max output current (75mA vs. 200mA); same 600kHz, 1.24V FB, and MSOP-8 package; no LBI/LBO pins. | Lacks integrated low-battery monitoring; suitable only for simpler boost needs without battery health management. | Choose for cost-sensitive, low-current applications where LBO signaling and extended input range (1.5V min) are unnecessary. |
Compared with LT1317BCMS8#PBF, the LT1317CMS8#PBF trades continuous switching for micropower Burst Mode efficiency below 10mA, while versus LT1307CMS8#PBF it adds 2.7× output current headroom and battery monitoring - making it optimal for mid-power portable medical and telemetry devices.
Availability
LT1317CMS8#PBF 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 RoHS-compliant sourcing.
Supply support for LT1317CMS8#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 full product support, documentation, and manufacturing continuity for legacy Linear parts including the LT1317 series.
The LT1317 family was designed specifically for micropower, wide-input-voltage boost conversion in battery-powered portable equipment - emphasizing ultra-low IQ, integrated battery monitoring, and robust operation across temperature and load extremes.
FAQ
What is the minimum input voltage required for LT1317CMS8#PBF to start regulation?
The LT1317CMS8#PBF starts regulation with an input voltage as low as 1.5V, verified across commercial temperature range (0°C to 70°C). It sustains operation down to this threshold even under full 200mA load, making it suitable for deeply discharged alkaline or NiMH cells. Startup behavior is confirmed in Figure 1 and Typical Performance Characteristics (TPC01–TPC04) of the official datasheet.
Does LT1317CMS8#PBF support ceramic output capacitors, and what compensation is needed?
Yes, LT1317CMS8#PBF supports ceramic output capacitors, but requires adjusted compensation: Figure 4 specifies RC = 20kΩ + 1500pF (vs. standard 33kΩ + 3.3nF) to maintain phase margin and prevent ringing. The VC pin's external network must be tuned per capacitor ESR; a 100pF capacitor from VC to GND is recommended for stability with low-ESR ceramics.
How does the low-battery detector function in shutdown mode for LT1317CMS8#PBF?
The low-battery detector in LT1317CMS8#PBF remains fully active during shutdown: the 200mV internal reference and LBI/LBO circuitry continue operating with only 30µA total current draw. When LBI voltage falls below 200mV, LBO pulls low (≤0.25V at 10µA sink) - enabling host systems to monitor battery state without enabling the converter.
What is the maximum achievable output current from LT1317CMS8#PBF, and what limits it?
LT1317CMS8#PBF delivers up to 200mA continuous output current under typical conditions (VIN ≥ 2.5V, TA = 25°C). Peak switch current is limited to 800mA (typical) by internal circuitry, but practical output is constrained by inductor saturation, diode forward drop, and thermal limits - especially in the MSOP package where θJA = 160°C/W demands careful layout and copper area.
Is LT1317CMS8#PBF pin-compatible with LT1307CMS8#PBF, and what design changes are needed?
Yes, LT1317CMS8#PBF is pin-compatible with LT1307CMS8#PBF in the MSOP-8 package, sharing identical pinout (VC, FB, SHDN, GND, SW, VIN, LBI, LBO). However, LT1317CMS8#PBF adds LBI/LBO functionality and supports higher output current - requiring only verification of feedback divider values and optional addition of LBI resistor network; no PCB revision is needed.
LT1317CMS8#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm 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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-MSOP
LT1317CMS8#PBF FAQ
1.How can I place an order for LT1317CMS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1317CMS8#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 LT1317CMS8#PBF reliable?
The price and inventory of LT1317CMS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1317CMS8#PBF is usually 5 days.
3.What payment methods are accepted for LT1317CMS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1317CMS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1317CMS8#PBF?
LT1317CMS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1317CMS8#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 LT1317CMS8#PBF?
For technical support, including LT1317CMS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1317CMS8#PBF requirements.
6.How does Aetrix verify that LT1317CMS8#PBF is sourced from the original manufacturer or authorized distributors?
All LT1317CMS8#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 LT1317CMS8#PBF meets industry standards.
7.What is the process for return or replacement of LT1317CMS8#PBF?
All LT1317CMS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1317CMS8#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 LT1317CMS8#PBF part is unused and in its original packaging.
Return procedure for LT1317CMS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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