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Analog Devices Inc. LT1308ACS8#TRPBF
- Part No.:
- LT1308ACS8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1308ACS8#TRPBF.pdf
- Description:
- IC REG BOOST SEPIC ADJ 2A 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:3,275
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Product details
Overview
LT1308ACS8#TRPBF 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, 1.22V feedback reference with ±2% accuracy, and integrated low-battery detector with 200mV threshold. It is used in digital cameras and handheld computers requiring high-efficiency step-up conversion.
For engineers reviewing the LT1308ACS8#TRPBF datasheet, LT1308ACS8#TRPBF pinout, LT1308ACS8#TRPBF application, or LT1308ACS8#TRPBF equivalent, key selection criteria include burst-mode efficiency at light loads, 36V switch rating for high-VOUT designs, SO-8 package thermal performance (θJA = 190°C/W), and compatibility with ceramic output capacitors via external VC compensation.
Technical Context
The LT1308ACS8#TRPBF employs current-mode PWM control with a 600kHz oscillator and internal ramp generator to suppress subharmonic oscillation above 50% duty cycle. Its error amplifier features 100V/V gain and 60μmhos transconductance, compensated externally via the VC pin using a series RC network (e.g., 47kΩ + 100pF).
Burst Mode™ operation activates automatically below ~400mA load, reducing switching frequency and holding quiescent current at 140μA; continuous mode resumes above that threshold. The low-battery detector uses a precision 200mV reference (±2% over temperature) and open-collector LBO output capable of sinking 50μA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 600kHz fixed - enables compact magnetics and filtering; supports >90% efficiency at 1A load with 4.7μH inductor. |
| Input Voltage Range | 1V to 10V - supports direct operation from single Li-ion, NiCd, or alkaline cells without pre-regulation. |
| Feedback Reference | 1.22V ±2% - sets output voltage via resistor divider (VOUT = 1.22V × (1 + R1/R2)); enables stable 3.3V, 5V, or 12V outputs. |
| Quiescent Current | 140μA (no load) - minimizes battery drain in standby; drops to <1μA in shutdown. |
| Switch VCESAT | 290mV at 2A (25°C) - reduces conduction loss; supports ≥1A output with <300mV dropout across internal NPN switch. |
| Low-Battery Threshold | 200mV ±2% - accurate battery monitoring; LBO asserts low when LBI falls below threshold, compatible with 100kΩ divider networks. |
| Max Switch Voltage | 36V - enables boost outputs up to 34V; accommodates SEPIC topologies and higher-voltage rails. |
Pinout & Package
LT1308ACS8#TRPBF is housed in an 8-lead plastic SOIC (S8) package with θJA = 190°C/W and operating temperature range of 0°C to 70°C. Pin 4 serves as the sole ground connection; thermal performance relies on PCB copper area tied directly to this pin.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| LBO | Low-battery detector open-collector output | Sinks 50μA when LBI < 200mV; requires external pull-up (e.g., 220kΩ) to enable system-level battery alert signaling. |
| LBI | Low-battery detector input | Accepts divided battery voltage; bias current ≤100nA ensures minimal divider error with 100kΩ resistors. |
| VIN | Main power input | Supplies internal circuitry and switch driver; requires local 47μF tantalum bypass capacitor placed ≤5mm from pin. |
| SW | Internal NPN switch collector | Connects to inductor/diode node; high dI/dt path - minimize trace area to reduce EMI and ringing. |
| VC | Error amplifier output / compensation node | External RC (e.g., 47kΩ + 100pF) sets loop stability; sinking ≥40μA forces micropower mode in LT1308B variants. |
| FB | Feedback input | Monitors output via resistor divider; 1.22V reference enables precise regulation; bias current ≤80nA limits divider loading. |
| SHDN | Enable/disable control | Active-high logic input; enables device at ≥1V (independent of VIN); floats to disable with <0.1μA leakage. |
| GND | Power and signal ground | Single-point ground tie for switching loop; PCB copper under pin acts as heat sink; avoid shared ground paths. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode™ operation | Reduces average IQ to 140μA at light loads while maintaining regulation - extends battery life in intermittent-use devices like pagers and GPS receivers. |
| 36V switch rating | Enables 34V boost outputs and robust SEPIC operation across wide VIN ranges - supports 3V-to-10V input → 5V output applications without redesign. |
| Integrated 200mV low-battery reference | ±2% accuracy over temperature eliminates need for external voltage reference - simplifies battery monitoring in space-constrained handhelds. |
| Start-up into heavy loads | Delivers full 3.5A peak inductor current during startup - avoids brownout in high-capacitance systems (e.g., LCD bias supplies with 220μF output caps). |
| External VC compensation | Allows stability optimization with ceramic or tantalum output capacitors - removes ESR dependency and supports low-profile MLCC-based designs. |
Applications
| Digital Cameras | GSM/CDMA Phones |
|---|---|
Use Scenario: Powering CCD/CMOS image sensors and flash LEDs from a single Li-ion cell. IC Role / Device Role / Timing Role: Step-up converter generating stable 5V/1A rail for sensor bias and LED drive circuits. Use Value: Burst Mode™ maintains >85% efficiency at 10mA preview current while delivering full 1A flash pulse without voltage sag. |
Use Scenario: Supplying RF power amplifier and baseband ICs in dual-voltage mobile handsets. IC Role / Device Role / Timing Role: Primary boost regulator providing 3.3V or 5V from declining 3.0–4.2V battery. Use Value: 140μA quiescent current extends standby time; 36V switch rating supports future 12V PA bias requirements. |
| LCD Bias Supplies | Handheld Computers |
Use Scenario: Generating high-voltage (12–24V) positive/negative rails for TFT-LCD panel drivers. IC Role / Device Role / Timing Role: High-efficiency boost converter in SEPIC configuration for wide-input-range bias generation. Use Value: Starts reliably into 220μF output capacitance; 600kHz switching allows small 4.7μH inductors and compact PCB layout. |
Use Scenario: Providing regulated 5V system rail and 3.3V I/O rail from a single-cell battery in PDAs and rugged tablets. IC Role / Device Role / Timing Role: Main DC/DC converter enabling USB peripheral power and memory interface voltage scaling. Use Value: Pin-compatible upgrade from LT1308 with improved line regulation (0.01%/V) and tighter FB reference tolerance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1308BCS8#TRPBF | Continuous switching at light loads (2.5mA IQ); no Burst Mode™; identical pinout and package. | Preferred where low-output-ripple is critical (e.g., RF sections), despite lower light-load efficiency. | Select LT1308BCS8#TRPBF when constant-frequency operation outweighs micropower needs. |
| MAX77801EWA+T | 3MHz switching, 2A switch, integrated MOSFET, 2.5V–5.5V input only; WLP-12 package. | Targets ultra-compact, high-density layouts; lacks low-battery detector and 1V start capability. | Choose MAX77801EWA+T for space-constrained designs needing >2A output and 3MHz ripple suppression. |
Compared with LT1308BCS8#TRPBF, the LT1308ACS8#TRPBF trades continuous ripple-free output for 140μA quiescent current and superior light-load efficiency; versus MAX77801EWA+T, it offers wider input range (1V–10V), integrated low-battery detection, and proven reliability in industrial handhelds.
Availability
LT1308ACS8#TRPBF 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 RoHS-compliant packaging.
Supply support for LT1308ACS8#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 its legacy of high-performance analog and power management ICs for precision, industrial, and battery-powered applications.
The LT1308A series was designed specifically for micropower, single-cell boost conversion in portable electronics - emphasizing ultra-low IQ, robust start-up, and integrated battery monitoring without external components.
FAQ
What is the minimum input voltage required for LT1308ACS8#TRPBF to start up and regulate?
The LT1308ACS8#TRPBF guarantees operation down to 1V input, with typical start-up observed at 0.92V. It can start into heavy loads (e.g., 20Ω) from 1.5V input, delivering 3.5A peak inductor current to charge the output capacitor - a key advantage over bootstrapped converters that fail below 2V.
Does LT1308ACS8#TRPBF support ceramic output capacitors, and how is stability ensured?
Yes, LT1308ACS8#TRPBF supports ceramic output capacitors via its dedicated VC compensation pin. Stability is achieved by connecting an external RC network (e.g., 47kΩ + 100pF) between VC and GND, which replaces the ESR zero normally provided by tantalum capacitors - enabling low-ESR MLCC use without oscillation.
How does the low-battery detector in LT1308ACS8#TRPBF differ from the original LT1308?
The LT1308ACS8#TRPBF improves low-battery detection with ±2% accuracy on its 200mV internal reference (vs. ±5% on LT1308) and adds 50μA sink capability on LBO. Unlike the LT1308, it operates independently of VIN - LBI can be driven from a separate divider, and LBO remains functional even when SHDN is active.
Can LT1308ACS8#TRPBF be used in SEPIC topology, and what are the key layout considerations?
Yes, LT1308ACS8#TRPBF supports SEPIC configurations, as confirmed in Figure 8 of its datasheet for 3V–10V input to 5V/500mA output. Critical layout rules include minimizing SW node copper area, separating input/output grounds at a single point, and placing C1 within 5mm of VIN/GND pins to prevent startup failure or oscillation.
What is the thermal resistance and maximum junction temperature for LT1308ACS8#TRPBF in SO-8 package?
The LT1308ACS8#TRPBF in 8-lead SOIC has θJA = 190°C/W and TJMAX = 125°C. Its thermal performance depends heavily on PCB copper area tied to Pin 4 (GND), which functions as the primary heat sink - insufficient copper results in premature thermal shutdown under sustained 1A loads.
LT1308ACS8#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm 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):
- 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#TRPBF FAQ
1.How can I place an order for LT1308ACS8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1308ACS8#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 LT1308ACS8#TRPBF reliable?
The price and inventory of LT1308ACS8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1308ACS8#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1308ACS8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1308ACS8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1308ACS8#TRPBF?
LT1308ACS8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1308ACS8#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 LT1308ACS8#TRPBF?
For technical support, including LT1308ACS8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1308ACS8#TRPBF requirements.
6.How does Aetrix verify that LT1308ACS8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1308ACS8#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 LT1308ACS8#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1308ACS8#TRPBF?
All LT1308ACS8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1308ACS8#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 LT1308ACS8#TRPBF part is unused and in its original packaging.
Return procedure for LT1308ACS8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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