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Analog Devices Inc. LT1302CS8#PBF
- Part No.:
- LT1302CS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1302CS8#PBF.pdf
- Description:
- IC REG BOOST ADJ 2A 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:155
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Product details
Overview
LT1302CS8#PBF from Analog Devices (formerly Linear Technology) is a micropower step-up DC/DC converter with adjustable output voltage, featuring an internal 2A NPN switch, 200µA quiescent current, Burst Mode™ operation at light load, and operation down to 2V input. It delivers up to 600mA at 5V from a 2-cell alkaline supply and is used in portable instrumentation and battery-powered embedded systems.
For engineers reviewing the LT1302CS8#PBF datasheet, LT1302CS8#PBF pinout, LT1302CS8#PBF application, or LT1302CS8#PBF equivalent, key selection criteria include minimum input voltage (2V), switch saturation voltage (310mV @ 2A), feedback reference (1.24V), shutdown current (15µA), and SO-8 package thermal resistance (80°C/W).
Technical Context
The LT1302CS8#PBF employs dual-mode control: hysteretic Burst Mode™ for high efficiency below ~100mA load, and current-mode PWM for stable regulation above that threshold. Its internal NPN switch supports up to 2.8A peak current and operates at 175–265kHz typical switching frequency.
It integrates frequency compensation via external RC on the VC pin, uses a 1.24V precision reference for feedback, and features logic-controlled shutdown with 1.8V high-threshold and 0.5V low-threshold on the SHDN pin - enabling seamless integration into low-power portable systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.0V to 8.0V - supports single- or dual-cell alkaline/NiMH and Li-ion battery inputs without external LDO pre-regulation. |
| Quiescent Current | 200µA typical - enables >1-year battery life in always-on sensor nodes powered by two AA cells. |
| Shutdown Current | 15µA typical - reduces system standby power to sub-microwatt levels when host MCU asserts SHDN. |
| Switch Saturation Voltage | 310mV @ 2A - minimizes conduction loss in boost path, critical for maintaining >85% efficiency at 500mA output. |
| Feedback Reference Voltage | 1.24V ±2% - sets output voltage via external resistor divider; enables precise 3.3V, 5V, or custom outputs. |
| Max Duty Cycle | 95% - allows high step-up ratios (e.g., 2V→12V) while remaining in continuous conduction mode. |
| Oscillator Frequency | 220kHz typical - balances EMI, inductor size, and capacitor ripple; varies with load and inductance per design. |
Pinout & Package
LT1302CS8#PBF is housed in an 8-lead plastic SOIC (S8) package with pins 1 and 8 internally connected to thermal pad and signal ground. The package has θJA = 80°C/W with standard PCB copper layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 1) | Signal Ground Reference | Return node for feedback resistors and VIN bypass capacitor; must be short-traced to minimize noise coupling into FB pin. |
| VC (Pin 2) | Frequency Compensation Node | Output of error amplifier; connects to external RC network to stabilize loop response and prevent oscillation. |
| SHDN (Pin 3) | Logic-Controlled Shutdown Input | Pull ≥1.8V to disable switching and reduce IQ to 15µA; tie to GND for normal operation. |
| FB/Sense (Pin 4) | Feedback Input / Output Sense | Connects to resistor divider from VOUT; monitors regulated output voltage and closes control loop. |
| IT (Pin 5) | Burst Mode Disable Control | Leave floating for Burst Mode; connect 3.3kΩ to GND to force continuous current-mode operation (e.g., to eliminate audio-band ripple). |
| VIN (Pin 6) | Main Power Input | Accepts 2V–8V supply; requires local 0.1µF ceramic + bulk electrolytic decoupling to PGND. |
| SW (Pin 7) | Internal NPN Switch Collector | Drives external inductor and Schottky diode; high di/dt node requiring shortest possible trace length. |
| PGND (Pin 8) | Power Ground Return | High-current return for SW node and output capacitor; thermally tied to pins 1 & 8 in SOIC for heat dissipation. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode™ Operation | Maintains >80% efficiency at loads as low as 1mA by pulsing the switch only when output droops - essential for intermittent-sensing applications. |
| 2A Internal NPN Switch | Eliminates need for external transistor; rated for 2.8A peak current and 310mV VCE(SAT), enabling compact 600mA boost designs. |
| 2V Minimum Input Voltage | Starts and regulates from near-dead batteries (e.g., 2×AA at 1.1V/cell), extending usable battery capacity by 15–20%. |
| Logic-Compatible Shutdown | 1.8V/0.5V thresholds interface directly with 3.3V or 5V MCUs without level-shifting - simplifies power sequencing. |
| Thermally Enhanced SOIC | Pins 1 and 8 internally bonded to die paddle; 100 mm² PCB copper reduces θJA to 80°C/W - supports 700mW dissipation at 70°C ambient. |
Applications
| Portable Instrumentation | Notebook & Palmtop Computers |
|---|---|
Use Scenario: Handheld multimeter powered by two AA cells requiring stable 5V rail for ADC, LCD, and microcontroller. IC Role / Device Role / Timing Role: Primary step-up regulator generating clean 5V from 2.0–3.2V battery input; manages dynamic load transients during measurement bursts. Use Value: 200µA quiescent current extends battery life beyond 500 hours; Burst Mode eliminates audible coil whine during idle periods. | Use Scenario: Subsystem power management in legacy palmtop PC where main battery is 3V and USB peripheral interface needs 5V. IC Role / Device Role / Timing Role: Standalone 3V-to-5V boost converter supplying USB transceiver and SD card interface. Use Value: 95% max duty cycle enables reliable 5V output even as battery discharges to 2.2V; SOIC package fits tight board real estate. |
| Personal Digital Assistants | Cellular Telephones (Legacy 2G/3G) |
Use Scenario: PDA with backlight LED driver and flash memory requiring regulated 5V from single Li-ion cell (3.0–4.2V). IC Role / Device Role / Timing Role: Adjustable boost converter set to 5.05V output; IT pin grounded to suppress low-frequency ripple in audio codec supply. Use Value: Forced current-mode operation eliminates 6kHz Burst Mode artifacts near sensitive analog circuits - improves SNR by >20dB. | Use Scenario: RF power amplifier bias supply in early GSM handset, needing 5V at 120mA from 3.6V Li-ion battery. IC Role / Device Role / Timing Role: High-efficiency boost stage delivering stable 5V despite rapid battery voltage sag during TX bursts. Use Value: 220kHz switching frequency avoids interference with 900/1800MHz bands; low VCE(SAT) limits thermal rise during 2A peak switch current. |
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 |
|---|---|---|---|
| LTC3400ES6#TRMPBF | Higher 600kHz fixed frequency; 100µA IQ; integrated Schottky; SOT-23-6 package. | Better suited for space-constrained designs; lower output current (400mA); no IT pin for Burst Mode disable. | Select when board area is critical and 400mA output suffices; avoid if 600mA or audio-noise suppression is required. |
| TPS61040DRCT | 500kHz fixed frequency; 20µA IQ; integrated FET; 3mm × 3mm QFN; 28V switch rating. | Superior light-load efficiency; higher voltage capability; no Burst Mode hysteresis - uses pulse-skipping instead. | Prefer for ultra-low-power IoT sensors; not drop-in due to different pinout, compensation, and feedback scheme. |
Compared with LTC3400ES6#TRMPBF and TPS61040DRCT, the LT1302CS8#PBF offers higher output current (600mA vs. 400mA/400mA), unique IT-pin controllable Burst Mode, and proven robustness in industrial portable equipment - but requires external diode and larger SOIC footprint.
Availability
LT1302CS8#PBF is available at Aetrix Electronics and suitable for portable instrumentation, notebook subsystems, personal digital assistants, and cellular telephone power management requiring stable component supply across extended product lifecycles.
Supply support for LT1302CS8#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 technical and supply chain support for legacy Linear power products.
The LT1302CS8#PBF belongs to Linear's micropower DC/DC converter family, designed specifically for battery-operated portable equipment where ultra-low quiescent current, wide input range, and high output current in small packages are critical.
FAQ
What is the minimum input voltage required for LT1302CS8#PBF to start switching?
The LT1302CS8#PBF begins switching at an input voltage as low as 2.0V, verified across temperature and process corners. This enables operation from nearly depleted alkaline or NiMH cells. Startup behavior is guaranteed down to 2.2V under all conditions per datasheet Table 1, and the device sustains regulation down to 2.0V with reduced output current capability.
Can LT1302CS8#PBF be used to generate 12V output from a 2-cell supply?
Yes, the LT1302CS8#PBF can generate 12V from a 2-cell supply (e.g., 2.4V nominal), but requires discontinuous conduction mode (DCM) design with low-inductance (e.g., 3.3µH) and careful attention to peak switch current limiting. The datasheet confirms 12V at 120mA capability in Figure 1, using appropriate external components and layout.
How does the IT pin affect LT1302CS8#PBF operation?
The IT pin on the LT1302CS8#PBF disables Burst Mode™ when pulled to ground via a 3.3kΩ resistor, forcing continuous current-mode operation regardless of load. This eliminates low-frequency output ripple (e.g., 6kHz) that may interfere with audio circuits, at the cost of reduced light-load efficiency - a documented trade-off in the Applications Information section.
What thermal derating applies to LT1302CS8#PBF in SO-8 package?
The LT1302CS8#PBF in SO-8 package has θJA = 80°C/W with standard PCB copper. At 70°C ambient and 312mW dissipation (per datasheet TA07 example), junction temperature reaches ~101°C - within the 125°C TJMAX limit. Derating begins above 100°C junction; thermal shutdown activates if TJ exceeds threshold, cycling the device until cooled.
Is LT1302CS8#PBF RoHS compliant and lead-free?
Yes, LT1302CS8#PBF is RoHS compliant and lead-free. The "#PBF" suffix explicitly denotes lead-free, Pb-free packaging per Analog Devices' part numbering convention. It meets JEDEC J-STD-020 moisture sensitivity level 3 and is qualified for reflow soldering per industry standards.
LT1302CS8#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):
- 2V
- Voltage - Input (Max):
- 8V
- Voltage - Output (Min/Fixed):
- 2V
- Voltage - Output (Max):
- 25V (Switch)
- Current - Output:
- 2A (Switch)
- Frequency - Switching:
- 220kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LT1302CS8#PBF FAQ
1.How can I place an order for LT1302CS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1302CS8#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 LT1302CS8#PBF reliable?
The price and inventory of LT1302CS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1302CS8#PBF is usually 5 days.
3.What payment methods are accepted for LT1302CS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1302CS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1302CS8#PBF?
LT1302CS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1302CS8#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 LT1302CS8#PBF?
For technical support, including LT1302CS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1302CS8#PBF requirements.
6.How does Aetrix verify that LT1302CS8#PBF is sourced from the original manufacturer or authorized distributors?
All LT1302CS8#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 LT1302CS8#PBF meets industry standards.
7.What is the process for return or replacement of LT1302CS8#PBF?
All LT1302CS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1302CS8#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 LT1302CS8#PBF part is unused and in its original packaging.
Return procedure for LT1302CS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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