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Analog Devices Inc. LT1302CS8#TRPBF
- Part No.:
- LT1302CS8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1302CS8#TRPBF.pdf
- Description:
- IC REG BOOST ADJ 2A 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:2,398
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Product details
Overview
LT1302CS8#TRPBF 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, and Burst Mode™ operation for high efficiency at light loads. It operates from 2V input and delivers up to 600mA at 5V from two alkaline cells, used in portable instrumentation and battery-powered embedded systems.
For engineers reviewing the LT1302CS8#TRPBF datasheet, LT1302CS8#TRPBF pinout, LT1302CS8#TRPBF application, or LT1302CS8#TRPBF equivalent, key selection criteria include minimum input voltage (2V), switch saturation voltage (310mV @ 2A), feedback reference (1.24V), shutdown current (15µA), and SO-8 thermal resistance (80°C/W).
Technical Context
The LT1302CS8#TRPBF uses dual-mode control: hysteretic Burst Mode™ at light loads (enabling 200µA IQ) and current-mode regulation at heavy loads (ensuring stable transient response). Its internal NPN switch supports up to 400kHz switching and handles ≥2A peak current with 310mV VCE(SAT).
It integrates frequency compensation via external RC on the VC pin, supports logic-controlled shutdown (VSHDNH = 1.8V), and features a dedicated IT pin to force current-mode operation-eliminating audible burst ripple in audio-sensitive applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.0V to 8.0V - enables operation from single Li-ion or two alkaline cells without brownout. |
| Quiescent Current | 200µA typical - preserves battery life in always-on portable devices. |
| Shutdown Current | 15µA typical - reduces system standby power to sub-microwatt levels. |
| Switch Saturation Voltage | 310mV at 2A - minimizes conduction loss and improves efficiency at high load. |
| Feedback Reference Voltage | 1.24V ±2% - sets output voltage via external resistor divider; enables precise adjustable regulation. |
| Max Switch Current | 2.8A guaranteed - supports robust 600mA output even under worst-case input and temperature conditions. |
| Oscillator Frequency | 175–265kHz typical - balances EMI, inductor size, and efficiency for portable designs. |
| Thermal Resistance θJA | 80°C/W (SO-8 package) - requires ≥100 mm² copper pour for safe 70°C ambient operation at full load. |
Pinout & Package
LT1302CS8#TRPBF is housed in an 8-lead plastic SOIC (S8) package with pins 1 and 8 internally connected for thermal enhancement. The exposed pad structure (pins 1 & 8 tied to GND/PGND) provides low thermal impedance to PCB copper.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 1) | Signal Ground Reference | Return path for feedback resistors and VIN bypass capacitor; must be short-traced to minimize noise coupling into FB. |
| VC (Pin 2) | Frequency Compensation Node | Output of error amplifier; connects to series 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 (LT1302) / Fixed Sense (LT1302-5) | For LT1302CS8#TRPBF: connects to resistor divider to set output voltage; bias current <100nA enables high-impedance dividers. |
| IT (Pin 5) | Burst Mode Disable Control | Leaving floating enables Burst Mode; connecting 3.3kΩ to GND forces continuous current-mode operation to eliminate low-frequency ripple. |
| VIN (Pin 6) | Main Power Input | Accepts 2V–8V supply; requires local 0.1µF ceramic + bulk electrolytic bypass to PGND to suppress switching noise. |
| SW (Pin 7) | Internal NPN Switch Collector | Drives external inductor/diode; layout must minimize trace inductance to reduce voltage spikes and EMI. |
| PGND (Pin 8) | Power Ground Return | High-current return for SW node; must be joined to Pin 1 under package and routed separately from signal ground to avoid noise injection. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode™ Operation | Reduces quiescent current to 200µA and eliminates audible switching noise at light loads by gating oscillator bursts. |
| 2A Internal NPN Switch | Eliminates need for external high-current transistor; supports >600mA output with minimal external components. |
| Adjustable Output Voltage | Configured via external resistor divider on FB pin; supports 5V, 12V, or custom outputs from 2V input. |
| Logic-Controlled Shutdown | Reduces total system standby current to 15µA - critical for long-life battery applications like PDAs and sensors. |
| Current-Mode Control Architecture | Provides inherent cycle-by-cycle current limiting and excellent line/load transient response without external compensation complexity. |
| Low-Voltage Start-Up | Operates down to 2.0V input - enables use with partially discharged batteries or single-cell LiFePO₄ sources. |
Applications
| Portable Instrumentation | Notebook & Palmtop Computers |
|---|---|
Use Scenario: Handheld multimeter powered by two AA cells requiring stable 5V rail for ADC and microcontroller. IC Role / Device Role / Timing Role: Step-up regulator generating regulated 5V from 2.2–3.2V battery input while maintaining >85% efficiency across 1–500mA load range. Use Value: Enables >100-hour battery life due to 200µA quiescent current and Burst Mode™ efficiency at standby. | Use Scenario: Backlight driver power supply in early-generation palmtop PCs with tight board space and thermal constraints. IC Role / Device Role / Timing Role: High-current boost converter delivering 5V/600mA from dual-cell alkaline supply using compact SO-8 footprint. Use Value: Eliminates need for external MOSFET and gate driver; SO-8 thermal design supports 70°C ambient with 100 mm² copper. |
| Personal Digital Assistants (PDAs) | Cellular Telephones (Legacy) |
Use Scenario: PDA main system rail generation where audio circuitry demands ultra-low ripple and no audible switching artifacts. IC Role / Device Role / Timing Role: Adjustable boost converter with IT pin forced to GND to suppress Burst Mode™ and deliver clean 3.3V/500mA output. Use Value: Removes 6kHz burst ripple that would otherwise modulate audio amplifiers and cause audible buzz. | Use Scenario: RF module power supply in GSM handsets requiring fast load transient response during transmission bursts. IC Role / Device Role / Timing Role: Current-mode DC/DC converter supplying 5V to PA driver stage with <10µs recovery from 100mA→600mA step load. Use Value: Maintains stable VCC during TX bursts due to inherent current-loop bandwidth and low VCE(SAT) switch. |
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 efficiency (92% vs 88% @ 2.5V→5V/500mA); 2MHz fixed-frequency; integrated Schottky diode; 6-pin TSOT-23 package. | Requires smaller inductor/capacitor; unsuitable for >600mA loads; lacks IT pin for burst suppression. | Select when board area is constrained and load ≤400mA; avoid if audio-noise immunity or >500mA output is required. |
| TPS61040DRVR | Fixed 5V output only; 28V switch rating; 500mA max output; 5-pin SOT-23; no IT pin or Burst Mode™. | Lower BOM cost but no adjustable output; cannot replace LT1302CS8#TRPBF in variable-voltage or audio-critical designs. | Choose for simple 5V-only applications with light-to-moderate load; not suitable for adjustable or low-noise use cases. |
Compared with LTC3400ES6#TRMPBF and TPS61040DRVR, the LT1302CS8#TRPBF offers unique adjustability, 2A switch headroom, and the IT pin for eliminating audible ripple-making it irreplaceable in legacy portable instrumentation and audio-sensitive boost applications.
Availability
LT1302CS8#TRPBF is available at Aetrix Electronics and suitable for portable instrumentation, notebook computers, personal digital assistants, and cellular telephones requiring stable component supply with long-term industrial availability.
Supply support for LT1302CS8#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 full technical and manufacturing continuity for legacy Linear products including the LT1302 family.
The LT1302 product line was designed specifically for micropower, high-output-current boost conversion in space-constrained, battery-operated systems-emphasizing low IQ, robust switching, and flexible feedback architecture.
FAQ
What is the minimum input voltage required for LT1302CS8#TRPBF to start switching?
The LT1302CS8#TRPBF starts switching at an input voltage as low as 2.0V, verified across the 0°C to 70°C operating temperature range. This allows reliable operation from nearly depleted two-cell alkaline or NiMH batteries, and supports single-cell LiFePO₄ sources. Startup behavior is guaranteed down to 2.2V per the Electrical Characteristics table, with functional regulation maintained above 2.0V.
Can LT1302CS8#TRPBF be used to generate 12V output? What are the key design considerations?
Yes, LT1302CS8#TRPBF can generate 12V output (e.g., 2-cell to 12V/120mA), as confirmed in the datasheet Figure 1 and Applications Information section. Key design considerations include selecting a low-DCR inductor (≤0.05Ω), using a Schottky diode rated ≥20V/2A (e.g., MBRS130LT3), ensuring discontinuous conduction mode for high duty cycles, and verifying thermal rise with θJA = 80°C/W and ≥100 mm² copper.
How does the IT pin on LT1302CS8#TRPBF affect operation, and what is the recommended termination?
The IT pin on LT1302CS8#TRPBF disables Burst Mode™ when pulled to GND via a 3.3kΩ resistor, forcing continuous current-mode operation. This eliminates low-frequency (≈6kHz) output ripple critical in audio applications. Leaving the IT pin floating enables default Burst Mode™ for optimal light-load efficiency. Do not capacitively couple or use large resistors - only the specified 3.3kΩ to GND is validated.
What is the maximum guaranteed switch current for LT1302CS8#TRPBF, and how is it tested?
The LT1302CS8#TRPBF guarantees a minimum switch current of 2.0A and a maximum of 3.9A (typical 2.8A) under full-power current-mode operation, as stated in the Electrical Characteristics table (Note 3). Minimum current is 100% tested; maximum is guaranteed by design and validated via characterization across temperature and process corners - not production-tested per unit.
Is LT1302CS8#TRPBF RoHS compliant and lead-free?
Yes, LT1302CS8#TRPBF is RoHS compliant and lead-free. The "#TRPBF" suffix explicitly denotes lead-free (Pb-free), RoHS-compliant packaging per Analog Devices' product marking conventions and datasheet Package Description section. It uses matte tin lead finish and meets JEDEC J-STD-020 moisture sensitivity level 3 requirements.
LT1302CS8#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
- 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#TRPBF FAQ
1.How can I place an order for LT1302CS8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1302CS8#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 LT1302CS8#TRPBF reliable?
The price and inventory of LT1302CS8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1302CS8#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1302CS8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1302CS8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1302CS8#TRPBF?
LT1302CS8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1302CS8#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 LT1302CS8#TRPBF?
For technical support, including LT1302CS8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1302CS8#TRPBF requirements.
6.How does Aetrix verify that LT1302CS8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1302CS8#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 LT1302CS8#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1302CS8#TRPBF?
All LT1302CS8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1302CS8#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 LT1302CS8#TRPBF part is unused and in its original packaging.
Return procedure for LT1302CS8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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