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Analog Devices Inc. LT1317CMS8#TRPBF
- Part No.:
- LT1317CMS8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LT1317CMS8#TRPBF.pdf
- Description:
- IC REG BST SEPIC ADJ 710MA 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,490
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Product details
Overview
LT1317CMS8#TRPBF 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 portable medical devices like glucose meters and battery-powered GPS receivers.
For engineers reviewing the LT1317CMS8#TRPBF datasheet, LT1317CMS8#TRPBF pinout, LT1317CMS8#TRPBF application, or LT1317CMS8#TRPBF equivalent, key selection criteria include its 1.24V feedback voltage, 300mV VCE(SAT) at 500mA switch current, Burst Mode ripple performance, and compatibility with ceramic or tantalum output capacitors in space-constrained battery-powered systems.
Technical Context
The LT1317CMS8#TRPBF employs current-mode PWM control with a 600kHz oscillator and internal ramp compensation to avoid subharmonic oscillation above 50% duty cycle. Its error amplifier drives the VC pin for external RC compensation, enabling stable regulation across wide input/output ranges and capacitor ESR variations.
Burst Mode operation is triggered by the hysteretic comparator A1 when load drops below ~300µA, reducing average supply current to 100µA while maintaining regulation via periodic switching bursts. The low-battery detector remains fully active during shutdown, with LBI input referenced to a precise 200mV ±5% bandgap and open-collector LBO output capable of sinking 10µA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 600kHz fixed - enables compact magnetics and filtering; typical range 520–720kHz over temp/voltage. |
| Input Voltage Range | 1.5V to 12V - supports single-cell alkaline, Li-ion, or multi-cell configurations without external regulators. |
| Feedback Voltage | 1.24V ±20mV - sets output via resistor divider; determines accuracy of regulated VOUT = 1.24V × (1 + R1/R2). |
| Quiescent Current | 100µA (not switching), 30µA (shutdown) - enables >1-year battery life in always-on low-power monitoring applications. |
| Switch VCE(SAT) | 300mV at 500mA - minimizes conduction loss and thermal rise in high-current boost stages. |
| Burst Mode Peak Switch Current | 275mA - limits inductor/switch stress during light-load bursts while suppressing output ripple amplitude. |
| Low-Battery Threshold | 200mV ±10mV on LBI pin - provides accurate undervoltage detection independent of supply rail or temperature drift. |
Pinout & Package
LT1317CMS8#TRPBF is housed in an 8-lead MSOP (MS8) package, 3.0mm × 3.0mm × 0.86mm, 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), 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 stabilize loop response; optional 100pF to ground improves noise immunity. |
| FB (Pin 2) | Feedback input to error amplifier | Monitors output via resistor divider; 1.24V reference ensures tight output regulation; low bias current (≤60nA) minimizes divider error. |
| SHDN (Pin 3) | Logic-level enable/disable control | Pull ≤0.4V to enter shutdown (30µA IQ); float or apply 1.4–6V to enable; no external pull-up required. |
| GND (Pin 4) | Power and signal reference ground | Must connect directly to local ground plane; shared return path for switch, feedback, and compensation circuits. |
| SW (Pin 5) | Internal NPN switch collector | Drives inductor/diode node; high dv/dt requires minimized trace area and short routing to reduce EMI and ringing. |
| VIN (Pin 6) | Main power input | Requires local 10µF bypass capacitor placed <5mm away; sensitive to trace inductance - poor placement causes instability or regulation failure. |
| LBI (Pin 7) | Low-battery detector input | Accepts divided battery voltage; 200mV threshold with ±5% tolerance; remains active in shutdown for system-level battery monitoring. |
| LBO (Pin 8) | Open-collector low-battery output | Sinks 10µA max; requires external 1MΩ pull-up to VOUT or logic rail; signals battery depletion to host processor or LED driver. |
Key Features
| Feature | Design Value |
|---|---|
| Automatic Burst Mode™ operation | Maintains regulation at loads as low as 300µA while holding quiescent current to 100µA - critical for multi-year battery life in remote sensors. |
| Integrated low-battery detector with 200mV reference | Enables accurate, temperature-stable battery monitoring without external references or comparators - reduces BOM count in portable diagnostics. |
| External compensation via VC pin | Allows optimization of transient response and stability for diverse output capacitors (tantalum, ceramic, polymer) and load profiles - avoids one-size-fits-all design compromises. |
| 600kHz fixed-frequency PWM | Permits use of small, low-profile inductors (e.g., Sumida CD43-100, 10µH) and compact ceramic output caps - essential for ultra-thin wearables and handhelds. |
| 1.5V minimum start-up voltage | Starts reliably from nearly depleted alkaline or NiMH cells - extends usable battery capacity beyond conventional 1.8V cutoffs. |
Applications
| Glucose Monitoring Systems | Portable GPS Receivers |
|---|---|
Use Scenario: Battery-powered handheld glucose meter operating from two AA alkaline cells (1.8V–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 with Burst Mode efficiency at standby currents <1mA. Use Value: Enables >2-year battery life using standard alkalines while maintaining fast wake-up response and low output ripple during measurement cycles. | Use Scenario: Compact GPS module powered by single Li-ion cell (2.7V–4.2V), needing clean 3.3V supply for RF front-end and baseband processor. IC Role / Device Role / Timing Role: Primary boost regulator delivering 200mA at 3.3V with minimal EMI impact on sensitive GNSS receiver chain. Use Value: Achieves >85% efficiency across full battery range and suppresses low-frequency ripple that could degrade RF sensitivity or cause false lock events. |
| Wireless Medical Sensors | Low-Power Diagnostic Instruments |
Use Scenario: Disposable Bluetooth-enabled ECG patch powered by coin cell (1.5V), requiring regulated 3.3V for BLE SoC and analog front-end. IC Role / Device Role / Timing Role: Micropower boost converter with ultra-low 100µA quiescent current and reliable start-up down to 1.5V. Use Value: Maximizes operational time per battery; integrated LBO pin directly triggers firmware alerts before sensor data corruption occurs. | Use Scenario: Handheld blood oximeter using two AAA cells, needing dual-rail supply (3.3V digital, 5V analog) with precise low-battery warning. IC Role / Device Role / Timing Role: Primary 3.3V regulator with dedicated LBI/LBO interface for system-level battery health reporting. Use Value: Eliminates need for separate voltage monitor IC; 200mV LBI threshold aligns with clinical battery discharge curves for predictable end-of-life indication. |
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#TRPBF | No Burst Mode - continuous 600kHz switching at all loads; higher light-load IQ (7.5mA vs. 100µA); identical pinout and compensation. | Eliminates low-frequency output ripple but sacrifices >90% efficiency below 5mA - preferred where ripple-sensitive analog circuits coexist with digital loads. | Select LT1317BCMS8#TRPBF when output ripple frequency must remain fixed at 600kHz regardless of load; avoid if battery runtime is primary concern. |
| LT1307CMS8#TRPBF | Single-cell optimized (1.5V–10V), lower max output current (75mA), same 600kHz freq and MS8 package; lacks LBI/LBO pins. | No integrated battery monitoring; suited for simpler, lower-power applications like cordless phones or pagers where external supervision is available. | Choose LT1307CMS8#TRPBF only when LBO functionality is unnecessary and load current stays ≤75mA - not a drop-in replacement due to missing LBI/LBO pins. |
Compared with LT1317BCMS8#TRPBF and LT1307CMS8#TRPBF, the LT1317CMS8#TRPBF uniquely balances micropower Burst Mode efficiency, integrated battery monitoring, and 200mA output capability - making it optimal for battery-critical medical and portable instrumentation where both runtime and system-level battery awareness are mandatory.
Availability
LT1317CMS8#TRPBF is available at Aetrix Electronics and suitable for glucose meters, portable GPS receivers, wireless medical sensors, and low-power diagnostic instruments requiring stable component supply with long-term lifecycle support.
Supply support for LT1317CMS8#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, documentation, and manufacturing continuity for legacy Linear parts including the LT1317 series.
The LT1317CMS8#TRPBF belongs to Linear's micropower DC/DC converter product line, designed specifically for battery-operated portable electronics where extended runtime, reliable low-voltage start-up, and integrated system supervision (e.g., battery monitoring) are essential.
FAQ
What is the maximum output current supported by the LT1317CMS8#TRPBF?
The LT1317CMS8#TRPBF supports up to 200mA of continuous output current under typical conditions (e.g., 2V input to 3.3V output). Peak switch current is limited to 800mA (typical) at 30% duty cycle, but sustained output depends on thermal design, inductor saturation rating, and PCB layout. Derating is required above 70°C ambient.
Does the LT1317CMS8#TRPBF require external compensation components?
Yes, the LT1317CMS8#TRPBF requires external compensation via the VC pin. A series RC network (e.g., 33kΩ + 3.3nF) is standard; an optional 100pF capacitor from VC to ground improves noise immunity. Compensation values must be adjusted based on output capacitor type (tantalum vs. ceramic) and ESR to ensure stability across temperature and load.
How does the low-battery detector function in the LT1317CMS8#TRPBF?
The LT1317CMS8#TRPBF's low-battery detector compares voltage on the LBI pin to an internal 200mV ±5% reference. When LBI falls below threshold, the open-collector LBO pin pulls low (≤0.25V at 10µA sink). Crucially, this circuit remains fully active even when SHDN is pulled low - enabling battery monitoring during system sleep states.
Can the LT1317CMS8#TRPBF operate from a single 1.5V alkaline cell?
Yes, the LT1317CMS8#TRPBF starts reliably from 1.5V input and operates down to this minimum voltage. Its Burst Mode architecture and 100µA quiescent current allow functional operation even as the cell discharges below 1.6V - extending usable battery capacity significantly compared to converters requiring ≥1.8V.
Is the LT1317CMS8#TRPBF pin-compatible with other members of the LT1317 family?
Yes, the LT1317CMS8#TRPBF shares identical pinout and footprint with LT1317BCMS8#TRPBF, LT1317IS8, and LT1317BIS8 - all in MS8 or SO-8 packages. However, functional differences exist: only the LT1317 (non-B) version implements Burst Mode, and only variants with "C" or "I" suffix include the commercial or industrial temperature grade specification.
LT1317CMS8#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm 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-MSOP
LT1317CMS8#TRPBF FAQ
1.How can I place an order for LT1317CMS8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1317CMS8#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 LT1317CMS8#TRPBF reliable?
The price and inventory of LT1317CMS8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1317CMS8#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1317CMS8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1317CMS8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1317CMS8#TRPBF?
LT1317CMS8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1317CMS8#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 LT1317CMS8#TRPBF?
For technical support, including LT1317CMS8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1317CMS8#TRPBF requirements.
6.How does Aetrix verify that LT1317CMS8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1317CMS8#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 LT1317CMS8#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1317CMS8#TRPBF?
All LT1317CMS8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1317CMS8#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 LT1317CMS8#TRPBF part is unused and in its original packaging.
Return procedure for LT1317CMS8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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