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Analog Devices Inc. LT1308IS8#PBF
- Part No.:
- LT1308IS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1308IS8#PBF.pdf
- Description:
- IC REG BOOST ADJ 2A 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:3,022
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Product details
Overview
LT1308IS8#PBF from Analog Devices (formerly Linear Technology) is an industrial-grade micropower boost DC/DC converter optimized for single-cell battery systems. It delivers 5V at 1A from a Li-Ion cell (VIN ≥ 1.2V), features fixed 600kHz switching, current-mode PWM control, and integrated low-battery detection with 200mV reference. Used in GSM RF power stages and DECT phone pulsed loads.
For engineers reviewing the LT1308IS8#PBF datasheet, LT1308IS8#PBF pinout, LT1308IS8#PBF application, or LT1308IS8#PBF equivalent, key selection criteria include guaranteed start-up into full load, Burst Mode operation below 200mA, 300mV VCE(SAT) at 2A, and −40°C to +85°C operating range with 8-lead SO package.
Technical Context
The LT1308IS8#PBF employs current-mode PWM architecture with a 600kHz oscillator and ramp generator, enabling fast transient response to line and load changes. Its error amplifier features 100V/V gain at −40°C and 80V/V at +85°C, with transconductance of 40µmhos and 1.22V feedback reference.
It integrates an NPN power switch rated for 2.5A peak current (DC = 40%), 300mV saturation voltage at 2A/−40°C, and shutdown current ≤3µA. The low-battery detector uses a 200mV internal reference with 180–220mV trip threshold and open-collector LBO output sinking 10µA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 1.2V to 6V - supports single NiCd (1.2V) or Li-Ion (2.7–4.2V) cells without external regulation. |
| Switching Frequency | 500–750kHz - enables use of compact 3.3–4.7µH inductors and ceramic output capacitors. |
| Output Current Capability | 1A continuous at 5V - sustained delivery from 1.2V input via high-duty-cycle operation (up to 95%). |
| Quiescent Current | 100µA (no load) - extends battery life in standby; drops to ≤3µA in shutdown mode. |
| Feedback Reference Voltage | 1.22V ±2.5% - sets output via external resistor divider; enables precise 3.3V, 5V, or custom VOUT. |
| Low-Battery Threshold | 200mV ±20mV - detects end-of-discharge in single-cell systems; LBO asserts open-collector low. |
| Switch Saturation Voltage | 300mV at 2A (−40°C) - minimizes conduction loss and thermal rise in high-current boost paths. |
Pinout & Package
LT1308IS8#PBF is housed in an 8-lead plastic SOIC (narrow, 0.150") package with θJA = 80°C/W and maximum junction temperature of 125°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| LBO | Low-battery detector output | Open-collector NPN output; sinks 10µA when active; requires external pull-up for processor interrupt signaling. |
| LBI | Low-battery detector input | Connects to resistive divider from VIN; compares against 200mV internal reference; bias current <30nA. |
| VIN | Main supply input | Accepts 1.2–6V; requires local 10µF ceramic bypass capacitor placed within 5mm of pin to prevent oscillation. |
| SW | Power switch collector | Drives external inductor/diode; handles 2.5A peak; trace area must be minimized to reduce EMI. |
| VC | Error amplifier compensation | Connect series RC (e.g., 47kΩ + 22nF) to GND; stabilizes loop response for varying load conditions. |
| FB | Feedback input | Senses divided output voltage; 1.22V reference sets VOUT = 1.22V × (1 + R1/R2); sensitive to noise-minimize trace area. |
| SHDN | Shutdown control | Ground to disable; tie to VIN or higher to enable; floating causes erratic behavior; sink/source current <4µA. |
| GND | Power and signal ground | Must connect directly to low-impedance ground plane enclosing all power components and bypass caps. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode operation | Automatically engages below ~200mA load to maintain >80% efficiency while reducing IQ to ~100µA. |
| Guaranteed start-up into full load | Starts regulating 5V/1A output even at VIN = 1.2V - eliminates need for pre-charge or soft-start circuits. |
| Integrated low-battery comparator | 200mV reference with 180–220mV trip window and open-collector LBO - enables system-level battery management without external IC. |
| Current-mode PWM control | Provides inherent cycle-by-cycle current limiting and stable operation across wide input/output ratios and ESR variations. |
| High-efficiency NPN switch | 300mV VCE(SAT) at 2A/−40°C reduces conduction loss and thermal stress in portable 1A boost applications. |
Applications
| GSM RF Power Supply | DECT Phone Transmitter |
|---|---|
Use Scenario: Powering GSM RF PA stages requiring 5V/1A pulsed output from a single Li-Ion cell (2.7–4.2V). IC Role / Device Role / Timing Role: Primary boost regulator with Burst Mode for idle periods and full-load capability during 577µs transmit bursts. Use Value: Maintains VOUT droop <200mV under 100mA→1A step with 100µF output capacitance; supports >90% efficiency at 3.6V input. |
Use Scenario: Delivering 3.3V/400mA pulsed output for DECT base station transmitter from a single NiCd cell (1.2V). IC Role / Device Role / Timing Role: High-current boost converter synchronized to 416µs DECT transmit frame timing. Use Value: Sustains regulated 3.3V during pulse with <150mV undershoot using 100µF output cap; operates reliably at 1.2V minimum input. |
| Digital Camera Dual-Rail Supply | Answer-Back Pager System |
Use Scenario: Generating 5V/175mA and 3.3V/175mA rails plus ±10V/10mA CCD bias from 1.6–6V input. IC Role / Device Role / Timing Role: Core boost controller in multi-output flyback-derived topology with auxiliary windings. Use Value: Enables compact, inductor-based multi-rail generation with single IC; supports 10µH main inductor and IR10BQ015 diodes. |
Use Scenario: Providing regulated 5V for microcontroller and RF front-end in low-power two-way pagers. IC Role / Device Role / Timing Role: Primary power source during brief receive/transmit windows; remains in Burst Mode between alerts. Use Value: Extends battery life via 100µA no-load IQ and <3µA shutdown; low-battery detection triggers alert before cell depletion. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1307CS8#PBF | Same 600kHz frequency and 1.22V reference, but MSOP-8 package and lower 75mA output current rating. | Targeted at ultra-low-power devices (e.g., sensors), not 1A GSM/DECT loads. | Select LT1307CS8#PBF only for sub-100mA applications where board space is critical. |
| LT3467ES6#TRMPBF | Higher 1.3MHz switching, integrated Schottky diode, 400mA output, and wider 2.5–16V input range. | Designed for higher-input systems (e.g., dual-cell or USB-powered); lacks low-battery comparator. | Choose LT3467ES6#TRMPBF when input exceeds 6V or integrated diode simplifies layout-but omit if 200mV LBI detection is required. |
Compared with LT1308IS8#PBF, LT1307CS8#PBF trades output current and thermal robustness for smaller footprint, while LT3467ES6#TRMPBF sacrifices low-voltage start-up and battery monitoring for higher frequency and integration-neither offers drop-in replacement capability due to differing pinout, current rating, or feature set.
Availability
LT1308IS8#PBF is available at Aetrix Electronics and suitable for GSM terminals, DECT phones, digital cameras, and answer-back pagers requiring stable component supply across industrial temperature ranges and long production lifecycles.
Supply support for LT1308IS8#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 its legacy precision analog and power management portfolio with full datasheet, simulation model, and application support.
The LT1308IS8#PBF belongs to Linear's micropower DC/DC converter family, designed specifically for battery-powered portable equipment demanding high efficiency at ultralow input voltages and intelligent power management features.
FAQ
What is the minimum input voltage required for LT1308IS8#PBF to start switching?
The LT1308IS8#PBF guarantees start-up into full load at VIN = 1.2V across the industrial temperature range (−40°C to +85°C). At room temperature, it can begin regulation as low as 1.0V, but 1.2V is the production-tested minimum for reliable operation under worst-case conditions including aging and voltage droop.
Does LT1308IS8#PBF support automatic light-load efficiency optimization?
Yes, the LT1308IS8#PBF implements automatic Burst Mode™ operation below approximately 200mA load current. In this mode, the device pulses the power switch at reduced frequency to maintain regulation while lowering quiescent current to ~100µA-critical for extending battery life in intermittent-use devices like pagers and GPS receivers.
Can LT1308IS8#PBF drive a 1A load continuously from a 1.2V input?
Yes, the LT1308IS8#PBF is specified to deliver 1A continuous output current at 5V from a 1.2V input in industrial grade (−40°C to +85°C), enabled by its 95% maximum duty cycle and low 300mV VCE(SAT) switch. Thermal design must accommodate up to 1.2W dissipation depending on layout and ambient conditions.
How does the low-battery detector in LT1308IS8#PBF function?
The LT1308IS8#PBF includes a dedicated low-battery detector with a precise 200mV internal reference. When voltage at the LBI pin falls below 180–220mV (set by a resistor divider from VIN), the open-collector LBO pin pulls low. This signal can directly interface with a microcontroller's interrupt pin to trigger battery warning or graceful shutdown.
What package type and RoHS status does LT1308IS8#PBF have?
The LT1308IS8#PBF uses an 8-lead plastic SOIC (narrow, 0.150") package per LTC DWG #05-08-1610 and is RoHS-compliant with lead-free finish (#PBF suffix). It features standard JEDEC MO-153 dimensions and is rated for reflow soldering per J-STD-020.
LT1308IS8#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Step-Up
- Output Configuration:
- Positive
- Topology:
- Boost
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 1V
- Voltage - Input (Max):
- 10V
- Voltage - Output (Min/Fixed):
- 1.22V
- Voltage - Output (Max):
- 30V (Switch)
- Current - Output:
- 2A (Switch)
- Frequency - Switching:
- 600kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LT1308IS8#PBF FAQ
1.How can I place an order for LT1308IS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1308IS8#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 LT1308IS8#PBF reliable?
The price and inventory of LT1308IS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1308IS8#PBF is usually 5 days.
3.What payment methods are accepted for LT1308IS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1308IS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1308IS8#PBF?
LT1308IS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1308IS8#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 LT1308IS8#PBF?
For technical support, including LT1308IS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1308IS8#PBF requirements.
6.How does Aetrix verify that LT1308IS8#PBF is sourced from the original manufacturer or authorized distributors?
All LT1308IS8#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 LT1308IS8#PBF meets industry standards.
7.What is the process for return or replacement of LT1308IS8#PBF?
All LT1308IS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1308IS8#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 LT1308IS8#PBF part is unused and in its original packaging.
Return procedure for LT1308IS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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