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Analog Devices Inc. LT1308ACS8#PBF
- Part No.:
- LT1308ACS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1308ACS8#PBF.pdf
- Description:
- IC REG BOOST SEPIC ADJ 2A 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:4,183
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Product details
Overview
LT1308ACS8#PBF from Analog Devices (formerly Linear Technology) is a micropower, fixed-frequency 600kHz boost DC/DC converter optimized for single-cell Li-ion (1V–10V input) and low-quiescent-current battery-powered systems. It delivers up to 1A at 5V from 1.5V input, features 140μA no-load quiescent current with Burst Mode™ operation, and integrates a ±2% accurate 200mV low-battery detector. Used in digital cameras and handheld computers requiring high light-load efficiency.
For engineers reviewing the LT1308ACS8#PBF datasheet, LT1308ACS8#PBF pinout, LT1308ACS8#PBF application, or LT1308ACS8#PBF equivalent, key selection criteria include its 600kHz switching frequency, 300mV switch VCE(SAT) at 2A, 1.22V feedback reference, 8-pin SO package thermal performance (θJA = 190°C/W), and Burst Mode™ behavior distinguishing it from the LT1308B variant.
Technical Context
The LT1308ACS8#PBF implements a current-mode PWM architecture with integrated 36V-rated NPN switch and error amplifier compensation via external RC network on the VC pin. Its Burst Mode™ operation-enabled by hysteresis in comparator A1-reduces average supply current to 140μA at no load while maintaining output regulation through controlled burst cycles.
It supports start-up into heavy loads without bootstrapping, uses a 200mV precision reference for low-battery detection (±2% over temperature), and features improved transient response via internal VC clamping. The shutdown pin operates independently of VIN, enabling activation with any ≥1V logic signal.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 600kHz typical - enables compact magnetics and EMI filtering above audio band. |
| Input Voltage Range | 1V to 10V - supports single Li-ion, multi-cell NiCd/NiMH, and wide-input industrial rails. |
| No-Load Quiescent Current | 140μA - ensures >1-year battery life in always-on sensor nodes or standby mode. |
| Feedback Reference Voltage | 1.22V ±10mV - sets output voltage via external resistor divider (e.g., 5V = 1.22V × (1 + R1/R2)). |
| Switch VCE(SAT) | 300mV at 2A (25°C) - minimizes conduction loss, supporting >85% efficiency at 500mA load. |
| Low-Battery Threshold | 200mV ±4mV (±2%) - provides precise battery depletion warning with open-collector LBO output. |
| Shutdown Current | 1μA max - eliminates battery drain during system sleep or storage. |
Pinout & Package
LT1308ACS8#PBF is housed in an 8-lead plastic SOIC (S8) package with θJA = 190°C/W, rated for 0°C to 70°C operation. Pin 4 serves as the sole ground connection; thermal performance relies on direct PCB copper coupling.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| LBO | Low-battery detector output | Open-collector NPN - sinks 50μA; requires external pull-up for logic-level alert signaling. |
| LBI | Low-battery detector input | High-impedance PNP base - compares battery voltage against internal 200mV reference. |
| VIN | Main power input | Accepts 1V–10V; requires local 47μF bypass capacitor placed ≤5mm from pin. |
| SW | Internal switch collector | Drives external inductor/diode; handles peak currents up to 4.5A; minimize trace area to reduce EMI. |
| VC | Error amplifier output / compensation | Connect series RC (e.g., 47kΩ + 100pF) to GND for loop stability; sinking >40μA forces micropower mode. |
| FB | Feedback input | Senses resistive divider output; 1.22V reference sets regulated output voltage. |
| SHDN | Enable/disable control | Active-high: ≥1V enables; 0V disables; floating = shutdown; no VIN tie required. |
| GND | Power and signal ground | Single ground pin - must connect directly to local ground plane; serves as primary heat path. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode™ operation | Reduces no-load IQ to 140μA while maintaining ±2% output regulation - critical for long-life portable devices. |
| 36V switch rating | Enables outputs up to 34V - supports LCD bias, white LED strings, and industrial 24V rail generation from low-voltage sources. |
| Improved low-battery detection | ±2% accuracy at room temp (±3% over –40°C to 85°C) with 50μA sink capability - eliminates external comparators in battery-monitoring circuits. |
| Start-up into heavy loads | Delivers full output voltage even with 5Ω load at 1.5V input - avoids brown-out during cold-start in handheld instruments. |
| Independent shutdown interface | SHDN pin accepts 1V–10V logic without VIN dependency - simplifies power sequencing in multi-rail systems. |
Applications
| Digital Cameras | GSM/CDMA Phones |
|---|---|
Use Scenario: Powering CCD/CMOS image sensors and flash LEDs from single Li-ion cell. IC Role / Device Role / Timing Role: Primary boost regulator generating stable 3.3V/5V rails with fast transient response to burst current demands. Use Value: Burst Mode™ extends battery runtime during preview mode; 600kHz switching allows small 4.7μH inductors and ceramic output caps. |
Use Scenario: Supplying RF power amplifier bias and baseband processor core voltage in slim-profile handsets. IC Role / Device Role / Timing Role: High-efficiency step-up converter delivering 2.8V/3.3V from declining battery (3.6V → 2.8V). Use Value: 140μA quiescent current preserves standby time; ±2% LBI threshold enables precise end-of-life battery cutoff. |
| LCD Bias Supplies | Handheld Computers |
Use Scenario: Generating positive and negative bias voltages (e.g., +12V, –10V) for TFT-LCD panels in medical monitors. IC Role / Device Role / Timing Role: Core boost stage in charge-pump or inverting configurations; drives high-impedance panel loads. Use Value: 36V switch rating supports >30V outputs; internal VC clamp improves line/load transient recovery within 10μs. |
Use Scenario: Providing main system voltage (5V) and peripheral rails (3.3V) from removable Li-ion pack in ruggedized PDAs. IC Role / Device Role / Timing Role: Primary DC/DC converter with integrated low-battery monitoring for OS-level power management. Use Value: Pin-compatible upgrade from LT1308 reduces system IQ by 50%; SO-8 package fits tight board space constraints. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1308BCS8#PBF | No Burst Mode™; continuous 600kHz switching at light loads; 2.5mA quiescent current vs. 140μA. | Preferred where low-frequency output ripple is unacceptable (e.g., RF-sensitive receivers). | Select LT1308BCS8#PBF when constant-frequency operation outweighs battery life requirements. |
| MAX771CSA+ | 520kHz switching; 100μA shutdown current; no integrated low-battery detector; requires external FB divider. | Used in legacy designs where footprint compatibility with MAX771 is required. | Choose MAX771CSA+ only if redesigning around existing MAX771 layout and omitting battery monitoring. |
Compared with LT1308BCS8#PBF, the LT1308ACS8#PBF trades higher light-load efficiency for output ripple; versus MAX771CSA+, it adds precision low-battery detection and tighter VFB tolerance but occupies identical SO-8 footprint.
Availability
LT1308ACS8#PBF is available at Aetrix Electronics and suitable for digital cameras, GSM/CDMA phones, and handheld computers requiring stable component supply, long-term lifecycle support, and guaranteed commercial-temperature performance.
Supply support for LT1308ACS8#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 LT1308 family.
The LT1308A series was designed specifically for micropower, single-cell boost conversion in portable instrumentation and communications equipment - emphasizing ultra-low IQ, robust start-up, and integrated power management functions.
FAQ
What is the maximum output voltage achievable with the LT1308ACS8#PBF?
The LT1308ACS8#PBF supports boost converter outputs up to 34V, enabled by its 36V-rated internal switch. This is confirmed in the Absolute Maximum Ratings table and Typical Application section, where 12V and 34V outputs are explicitly demonstrated using standard external components like the IR 10BQ015 diode and 4.7μH inductor.
Does the LT1308ACS8#PBF require an external compensation network?
Yes, the LT1308ACS8#PBF requires an external RC network connected between the VC pin and ground for loop stability. The datasheet specifies typical values of 47kΩ and 100pF, and notes that minimizing trace area at VC is critical. Omitting this network results in instability or oscillation, especially with low-ESR ceramic output capacitors.
How does the LT1308ACS8#PBF differ from the LT1308BCS8#PBF in Burst Mode™ operation?
The LT1308ACS8#PBF features hysteresis in comparator A1 to enable Burst Mode™, reducing no-load IQ to 140μA. The LT1308BCS8#PBF lacks this hysteresis and operates continuously at 600kHz with 2.5mA quiescent current - eliminating low-frequency output ripple but sacrificing light-load efficiency. This distinction is fundamental to device selection.
Can the LT1308ACS8#PBF be used in SEPIC topology?
Yes, the LT1308ACS8#PBF supports SEPIC configuration, as verified in Figure 8 and Applications Information section. It regulates output over input ranges spanning the output voltage (e.g., 3V–10V input to 5V output), using two coupled inductors and modified feedback. Component selection guidelines for SEPIC are provided in the datasheet.
What is the thermal resistance (θJA) of the LT1308ACS8#PBF in SO-8 package?
The LT1308ACS8#PBF in 8-lead plastic SOIC (S8) package has a junction-to-ambient thermal resistance (θJA) of 190°C/W, as specified in the Absolute Maximum Ratings table. This value assumes standard JEDEC 2-layer board conditions; actual performance improves with enhanced copper pour and thermal vias under the GND pad.
LT1308ACS8#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, Step-Up/Step-Down
- Output Configuration:
- Positive
- Topology:
- Boost, SEPIC
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 1V
- Voltage - Input (Max):
- 10V
- Voltage - Output (Min/Fixed):
- 1.22V
- Voltage - Output (Max):
- 34V
- Current - Output:
- 2A (Switch)
- Frequency - Switching:
- 600kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LT1308ACS8#PBF FAQ
1.How can I place an order for LT1308ACS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1308ACS8#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 LT1308ACS8#PBF reliable?
The price and inventory of LT1308ACS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1308ACS8#PBF is usually 5 days.
3.What payment methods are accepted for LT1308ACS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1308ACS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1308ACS8#PBF?
LT1308ACS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1308ACS8#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 LT1308ACS8#PBF?
For technical support, including LT1308ACS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1308ACS8#PBF requirements.
6.How does Aetrix verify that LT1308ACS8#PBF is sourced from the original manufacturer or authorized distributors?
All LT1308ACS8#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 LT1308ACS8#PBF meets industry standards.
7.What is the process for return or replacement of LT1308ACS8#PBF?
All LT1308ACS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1308ACS8#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 LT1308ACS8#PBF part is unused and in its original packaging.
Return procedure for LT1308ACS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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