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Analog Devices Inc. LT1317BCMS8#PBF
- Part No.:
- LT1317BCMS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LT1317BCMS8#PBF.pdf
- Description:
- IC REG BST SEPIC ADJ 710MA 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:148
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Product details
Overview
LT1317BCMS8#PBF 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, integrated 500mA NPN switch with 300mV VCE(SAT), and maintains continuous switching at light loads-unlike the Burst Mode–enabled LT1317 variant. It is used in glucose meters, portable medical instrumentation, and low-noise 3.3V/5V power rails.
For engineers reviewing the LT1317BCMS8#PBF datasheet, LT1317BCMS8#PBF pinout, LT1317BCMS8#PBF application, or LT1317BCMS8#PBF equivalent, key selection criteria include its non-Burst Mode operation (eliminating low-frequency ripple), 100µA shutdown current, 8-pin MSOP package compatibility, and precise 1.24V FB reference tolerance of ±2% over temperature.
Technical Context
The LT1317BCMS8#PBF implements a current-mode PWM architecture 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 an external RC compensation network on the VC pin to stabilize the control loop across input voltage and load variations.
Unlike the LT1317, the LT1317B variant disables automatic Burst Mode by lowering the hysteresis threshold of comparator A1, ensuring continuous 600kHz switching down to <50mA loads-sacrificing light-load quiescent current (7.5 mA typical during switching) for ripple-free output regulation critical in analog-sensing applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 600 kHz fixed (520–720 kHz range); enables compact magnetics and predictable EMI filtering. |
| 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 Voltage | 1.24 V ±2% (0°C to 85°C); sets output via resistor divider (e.g., 3.3 V = 1.24 × (1 + R1/R2)). |
| Peak Switch Current Limit | ≥660 mA (typical at VIN = 2.5 V, 30% duty); sustains high transient loads without foldback. |
| VCE(SAT) @ 500 mA | 300–350 mV; minimizes conduction loss and thermal rise in boost switch path. |
| Quiescent Current (SHDN = 0 V) | 40 µA (max); preserves battery life during system sleep while retaining LBO functionality. |
| Low-Battery Detector Threshold | 200 mV ±10 mV (LBI pin); remains active in shutdown for battery monitoring without auxiliary circuitry. |
Pinout & Package
LT1317BCMS8#PBF is housed in an 8-lead MSOP (MS8) package (3.0 mm × 3.0 mm × 0.86 mm), thermally enhanced with θJA = 160°C/W, suitable for space-constrained portable PCBs.
| 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; optional 100 pF to ground improves noise immunity. |
| FB (Pin 2) | Feedback input | Senses output voltage divider; 1.24 V reference enables precise output regulation; low bias current (≤80 nA) minimizes divider error. |
| SHDN (Pin 3) | Enable/disable control | Logic-level input: ≥1.4 V enables, ≤0.4 V shuts down (only LBO remains active); leakage <0.06 µA in shutdown. |
| GND (Pin 4) | Power and signal ground | Must connect directly to local ground plane; shared return for switch, feedback, and compensation paths. |
| SW (Pin 5) | Switch collector node | Drives external inductor/diode; high dI/dt requires minimized trace area and short routing to reduce EMI and voltage spikes. |
| VIN (Pin 6) | Main supply input | Bypassed with ≥10 µF ceramic/tantalum near pin; sensitive to trace inductance-must be placed <5 mm from IC. |
| LBI (Pin 7) | Low-battery detector input | Accepts scaled battery voltage; internal 200 mV reference enables undervoltage lockout; bias current flows out (≤40 nA). |
| LBO (Pin 8) | Low-battery open-collector output | Sinks 10 µA max; requires external pull-up (e.g., 1 MΩ) to interface with microcontroller interrupt or reset logic. |
Key Features
| Feature | Design Value |
|---|---|
| Continuous 600 kHz switching at light loads | Eliminates low-frequency output ripple (<100 Hz) critical for ADC reference supplies and sensor front-ends. |
| Integrated 500 mA NPN switch with 300 mV VCE(SAT) | Reduces external component count and conduction losses; supports >200 mA output with minimal thermal derating. |
| Active low-battery detector in shutdown mode | Enables battery monitoring during system sleep without auxiliary circuitry-no additional quiescent draw. |
| External frequency compensation (VC pin) | Allows optimization for diverse output capacitors (tantalum, ceramic, polymer) and load dynamics across temperature. |
| Pin-for-pin compatible with LT1307/LT1307B | Permits drop-in upgrade from single-cell boost converters; shares layout, BOM, and test fixtures. |
Applications
| Glucose Meter Power Supply | Portable Diagnostic Instrumentation |
|---|---|
Use Scenario: Powers precision analog front-end (AFE), LCD backlight, and microcontroller from two AA cells (2.0–3.2 V). IC Role / Device Role / Timing Role: Step-up regulator generating stable 3.3 V rail with <10 mV ripple under dynamic load (0–150 mA). Use Value: Continuous switching eliminates burst-induced noise that would corrupt electrochemical sensor measurements. |
Use Scenario: Supplies isolated 5 V and ±4 V rails for op-amp-based signal conditioning in handheld ultrasound probes. IC Role / Device Role / Timing Role: Primary boost converter feeding charge pump or LDO stages; synchronized 600 kHz clock aids EMI filtering. Use Value: 1.24 V FB reference tolerance ensures consistent output accuracy across –40°C to 85°C operating range. |
| Li-ion–Powered Medical Telemetry | Low-Noise Varactor Bias Supply |
Use Scenario: Converts single Li-ion cell (2.7–4.2 V) to regulated 5 V for Bluetooth LE radio and sensor interface ICs. IC Role / Device Role / Timing Role: Main DC/DC stage providing clean, ripple-free 5 V with fast transient response to RF transmit bursts. Use Value: 7.5 mA typical quiescent current during active operation balances efficiency and RF stability requirements. |
Use Scenario: Generates low-noise 33 V bias for RF varactor diodes in portable spectrum analyzers. IC Role / Device Role / Timing Role: High-voltage boost stage driving transformer-coupled multiplier; VC pin compensation suppresses switching artifacts. Use Value: External RC tuning enables optimal phase margin despite high output impedance and capacitive loading. |
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 |
|---|---|---|---|
| LT1317CMS8#PBF | Includes automatic Burst Mode operation below ~50 mA; 100 µA quiescent current vs. 7.5 mA in switching mode. | Preferred for ultra-low-power standby (e.g., pager memory backup); introduces ~10–100 Hz ripple at light loads. | Select LT1317CMS8#PBF only if minimizing average current draw at <1 mA load is prioritized over ripple performance. |
| LT1307BCS8#PBF | Single-cell optimized (1.1–10 V input); lower 500 kHz freq; no LBI/LBO pins; 300 mA switch rating. | Targeted at 1.5 V primary battery apps (e.g., remote controls); lacks battery monitoring capability. | Choose LT1307BCS8#PBF when footprint compatibility is needed but low-battery detection is unnecessary. |
Compared with LT1317CMS8#PBF, the LT1317BCMS8#PBF trades light-load efficiency for ripple-free regulation-critical in analog signal chains-while both share identical pinout, compensation, and layout. Versus LT1307BCS8#PBF, it adds battery monitoring and wider input range at the cost of higher quiescent current.
Availability
LT1317BCMS8#PBF is available at Aetrix Electronics and suitable for glucose meters, portable diagnostic instrumentation, and Li-ion–powered medical telemetry requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LT1317BCMS8#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, datasheets, and application engineering for legacy Linear parts including the LT1317 series.
The LT1317 family was designed for micropower, wide-input-voltage boost conversion in portable medical, instrumentation, and communications equipment where small size, low EMI, and battery monitoring are essential.
FAQ
What is the key functional difference between LT1317BCMS8#PBF and LT1317CMS8#PBF?
The LT1317BCMS8#PBF disables Burst Mode operation to maintain continuous 600 kHz switching at all loads-eliminating low-frequency output ripple but increasing light-load quiescent current to 7.5 mA. In contrast, the LT1317CMS8#PBF automatically enters Burst Mode below ~50 mA, reducing quiescent current to 100 µA while introducing 10–100 Hz ripple. Both share identical pinout, compensation, and package.
Can LT1317BCMS8#PBF drive a 200 mA load from a 1.5 V input?
Yes, the LT1317BCMS8#PBF is specified to start into full load and sustain 200 mA output across its full 1.5 V to 12 V input range. At 1.5 V input, efficiency drops due to higher duty cycle and switch losses, but the device maintains regulation per typical curves (e.g., >60% at 100 mA, 1.5 V input). Use low-DCR inductors (e.g., Sumida CD43-100) and low-ESR output capacitors.
How is the low-battery detector configured on LT1317BCMS8#PBF?
The LT1317BCMS8#PBF's low-battery detector uses an internal 200 mV reference connected to the inverting input of comparator A4. The LBI pin serves as the non-inverting input; when LBI voltage falls below 200 mV ±10 mV, LBO pulls low. A simple resistor divider from VIN to GND sets the trip point (e.g., 1 MΩ + 100 kΩ yields ~1.9 V trip). LBO remains active even when SHDN = 0 V.
What compensation components are recommended for LT1317BCMS8#PBF with a 10 µF ceramic output capacitor?
For a 10 µF ceramic output capacitor, the LT1317BCMS8#PBF requires adjusted compensation: use RC = 20 kΩ and CC = 1500 pF (per Figure 4), plus an optional 100 pF capacitor from VC to GND to improve noise immunity. This configuration optimizes transient response and phase margin-critical because ceramic caps' ultra-low ESR can destabilize the loop if uncompensated.
Is LT1317BCMS8#PBF pin-compatible with LT1307BCS8#PBF?
Yes, the LT1317BCMS8#PBF is pin-for-pin compatible with LT1307BCS8#PBF in the 8-lead SO-8 package, and functionally compatible with LT1307/LT1307B in MSOP. However, LT1307BCS8#PBF lacks LBI/LBO pins and is optimized for 1.1–10 V input (not 1.5–12 V), so direct substitution requires verifying input range and battery-monitoring requirements.
LT1317BCMS8#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
LT1317BCMS8#PBF FAQ
1.How can I place an order for LT1317BCMS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1317BCMS8#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 LT1317BCMS8#PBF reliable?
The price and inventory of LT1317BCMS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1317BCMS8#PBF is usually 5 days.
3.What payment methods are accepted for LT1317BCMS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1317BCMS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1317BCMS8#PBF?
LT1317BCMS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1317BCMS8#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 LT1317BCMS8#PBF?
For technical support, including LT1317BCMS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1317BCMS8#PBF requirements.
6.How does Aetrix verify that LT1317BCMS8#PBF is sourced from the original manufacturer or authorized distributors?
All LT1317BCMS8#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 LT1317BCMS8#PBF meets industry standards.
7.What is the process for return or replacement of LT1317BCMS8#PBF?
All LT1317BCMS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1317BCMS8#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 LT1317BCMS8#PBF part is unused and in its original packaging.
Return procedure for LT1317BCMS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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