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Analog Devices Inc. LT1302CS8-5#TRPBF
- Part No.:
- LT1302CS8-5#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1302CS8-5#TRPBF.pdf
- Description:
- IC REG BOOST 5V 2A 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:1,767
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Product details
Overview
LT1302CS8-5#TRPBF from Analog Devices (formerly Linear Technology) is a micropower, fixed 5V step-up DC/DC converter with an internal NPN switch rated for >2A peak current, 200µA quiescent current, and operation down to 2V input. It delivers up to 600mA at 5V from a 2-cell alkaline or NiMH supply and is used in battery-powered portable instrumentation requiring high light-load efficiency.
For engineers reviewing the LT1302CS8-5#TRPBF datasheet, LT1302CS8-5#TRPBF pinout, LT1302CS8-5#TRPBF application, or LT1302CS8-5#TRPBF equivalent, key selection criteria include its Burst Mode™ operation for sub-15µA shutdown current, 4.85–5.25V output voltage tolerance, 310mV typical switch saturation voltage, and SO-8 package thermal performance with θJA = 80°C/W.
Technical Context
The LT1302CS8-5#TRPBF integrates a fixed 5V feedback network and operates in dual-mode control: Burst Mode™ at light loads (enabling 15µA shutdown) and current-mode PWM at heavy loads (ensuring stable transient response). Its internal NPN switch supports up to 2.8A peak current and switches at 175–265kHz nominal frequency.
It features dedicated pins for frequency compensation (VC), shutdown (SHDN), and power ground separation (PGND vs GND), enabling optimized layout for EMI-sensitive applications. The device includes thermal shutdown and requires external RC compensation for loop stability across input (2–8V) and load (0–600mA) ranges.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.05V (Burst Mode), 4.97V (Current Mode); ±2.5% over temperature and line |
| Max Output Current | 600mA continuous at 5V from 2.5V input; limited by thermal design and external components |
| Quiescent Current | 200µA typical in active mode; drops to 15µA in shutdown-critical for multi-year battery life |
| Switch Saturation Voltage | 310mV typical at 2A-reduces conduction loss and improves efficiency at medium loads |
| Operating Input Range | 2.0V to 8.0V-supports single-cell LiFePO₄, two-cell alkaline/NiMH, or partially discharged batteries |
| Oscillator Frequency | 175–265kHz typical-enables compact magnetics while avoiding AM radio band interference |
| Shutdown Threshold | VSHDNH = 1.8V min; VSHDNL = 0.5V max-compatible with standard logic-level GPIOs |
Pinout & Package
LT1302CS8-5#TRPBF is housed in an 8-lead plastic SOIC (S8) package with exposed thermal pad connection via pins 1 and 8. Thermal resistance is θJA = 80°C/W with 100 mm² copper area.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 1) | Signal Ground Reference | Return for FB resistor divider and VIN bypass capacitor; must be isolated from PGND trace to avoid noise coupling |
| VC (Pin 2) | Frequency Compensation Node | Output of error amplifier; connects to series RC network for loop stability-layout sensitivity requires short trace |
| SHDN (Pin 3) | Logic-Controlled Shutdown Input | Pull ≥1.8V to disable switching; sink ≤0.5V for normal operation; bias current <20µA |
| SENSE/FB (Pin 4) | Fixed 5V Feedback Input | Internally connected to precision 1.24V reference; no external resistors needed-simplifies BOM and layout |
| IT (Pin 5) | Burst Mode Disable Control | Leave floating for Burst Mode; tie to GND via 3.3kΩ to force current mode at all loads-eliminates audible ripple |
| VIN (Pin 6) | Main Power Input | Accepts 2–8V; requires local 0.1µF X7R ceramic + bulk electrolytic; add 2–10Ω series resistor if VIN >5V |
| SW (Pin 7) | Internal NPN Switch Collector | Connects directly to inductor and Schottky diode anode; high di/dt path-must be shortest possible trace |
| PGND (Pin 8) | Power Ground Return | Return for switch current and output capacitor; thermally tied to pins 1/8 in SOIC-requires dedicated low-impedance plane |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode™ Operation | Maintains >75% efficiency at 1mA load by pulsing switch only when output droops-enables ultra-low-power sleep states |
| Integrated 5V Feedback Network | Eliminates external resistor divider, reducing component count, layout area, and tolerance drift over temperature |
| 2A Peak Switch Current Capability | Supports high-current boost topologies without external MOSFET-simplifies design for 500–600mA output requirements |
| Separate Signal and Power Ground Pins | Minimizes ground bounce and noise injection into feedback path-critical for stable regulation under dynamic load |
| Thermal Shutdown Protection | Activates at ~125°C junction temperature and cycles device on/off-prevents permanent damage during overload or poor heatsinking |
Applications
| Portable Instrumentation | Personal Digital Assistants |
|---|---|
Use Scenario: Handheld multimeter powered by two AA cells requiring stable 5V rail for ADC, display, and microcontroller. IC Role / Device Role / Timing Role: Primary step-up regulator generating regulated 5V from 2.0–3.2V battery input; manages load transients during measurement bursts. Use Value: 200µA quiescent current extends battery life beyond 1 year; Burst Mode eliminates audible coil whine during standby. | Use Scenario: Early PDA with monochrome LCD and touch controller drawing pulsed 5V loads up to 400mA. IC Role / Device Role / Timing Role: Fixed-output boost converter supplying main system rail; interfaces directly with low-voltage battery pack. Use Value: Internal 5V feedback reduces BOM cost and layout complexity; SO-8 package enables compact PCB footprint. |
| Notebook Peripherals | Flash Memory Programming |
Use Scenario: USB-powered barcode scanner with integrated laser diode requiring clean 5V at 300mA from 3.3V host bus. IC Role / Device Role / Timing Role: Step-up regulator boosting 3.3V USB VBUS to 5V for peripheral logic and analog front-end. Use Value: 310mV VCE(SAT) minimizes dropout and maintains regulation even as USB source sags to 4.4V. | Use Scenario: Embedded programmer for NOR flash requiring precise 5.0V ±2.5% during write/erase cycles. IC Role / Device Role / Timing Role: Precision fixed-output DC/DC converter providing tightly regulated programming voltage independent of battery state. Use Value: 4.85–5.25V output tolerance meets JEDEC flash spec; low output ripple (<50mV) prevents bit errors during high-speed writes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fixed-output boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3525ES6-5#TRMPBF | Higher 4MHz switching frequency; 1.5A switch; 25µA shutdown current; 6-lead TSOT-23 package | Better suited for space-constrained designs needing >1A peak current and faster transient response | Select when board area is critical and input voltage stays above 2.5V; not recommended for 2V start-up |
| TPS61200DRCT | Adjustable output (0.9–5.5V); 1.2A switch; 12µA shutdown; integrated soft-start; 10-pin VSON package | Requires external feedback resistors; adds soft-start but increases BOM and layout complexity | Choose when output voltage flexibility or inrush current limiting is required; less optimal for pure fixed-5V simplicity |
Compared with LTC3525ES6-5#TRMPBF and TPS61200DRCT, the LT1302CS8-5#TRPBF offers superior 2V start-up capability, lower component count due to integrated feedback, and proven robustness in industrial portable equipment-but trades off higher quiescent current and larger SO-8 footprint.
Availability
LT1302CS8-5#TRPBF is available at Aetrix Electronics and suitable for portable instrumentation, handheld medical devices, and battery-powered data loggers requiring stable component supply with long-term lifecycle support.
Supply support for LT1302CS8-5#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 product support, documentation, and manufacturing continuity for legacy Linear parts.
The LT1302CS8-5#TRPBF belongs to Linear's micropower DC/DC converter family, designed specifically for battery-operated systems where light-load efficiency, small solution size, and reliable start-up from weak cells are primary requirements.
FAQ
What is the minimum input voltage required for LT1302CS8-5#TRPBF to start regulation?
The LT1302CS8-5#TRPBF guarantees operation down to 2.0V input across temperature. It can start regulation from as low as 2.2V with typical 2-cell alkaline batteries under load, maintaining 5V output until battery voltage drops below 2.0V. Startup behavior is verified per datasheet Figure TA02 and Absolute Maximum Ratings table.
Does LT1302CS8-5#TRPBF require external feedback resistors to set the 5V output?
No. The LT1302CS8-5#TRPBF integrates the feedback resistor network internally-pin 4 (SENSE/FB) connects directly to the internal 1.24V reference, eliminating external resistors. This distinguishes it from the adjustable LT1302CS8 and ensures consistent 5.05V output in Burst Mode without calibration or tolerance drift.
How does the IT pin affect LT1302CS8-5#TRPBF operation?
The IT pin on LT1302CS8-5#TRPBF disables Burst Mode when pulled to GND via a 3.3kΩ resistor, forcing continuous current-mode operation regardless of load. This eliminates low-frequency output ripple (e.g., 6kHz bursting) beneficial in audio-sensitive applications, though it reduces light-load efficiency. Leaving IT floating enables default Burst Mode.
What thermal derating applies to LT1302CS8-5#TRPBF in SO-8 package?
With θJA = 80°C/W (SO-8, 100 mm² copper), LT1302CS8-5#TRPBF junction temperature rise is ∆T = PD × 80. At 600mA output and 3V input, typical power dissipation is ~312mW, yielding ~25°C rise above ambient. Derating begins above 101°C junction-thermal shutdown activates near 125°C. Layout with pins 1/8 thermally connected to copper is mandatory.
Can LT1302CS8-5#TRPBF drive a 12V output?
No. The LT1302CS8-5#TRPBF is a fixed 5V output device with internal feedback. For 12V output, use the adjustable LT1302CS8 with external resistor divider, or select a different part such as LT1308 or LTC3525 configured for 12V. Attempting to force 12V with LT1302CS8-5#TRPBF will result in regulation failure and potential instability.
LT1302CS8-5#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:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2V
- Voltage - Input (Max):
- 8V
- Voltage - Output (Min/Fixed):
- 5V
- Voltage - Output (Max):
- -
- 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
LT1302CS8-5#TRPBF FAQ
1.How can I place an order for LT1302CS8-5#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1302CS8-5#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 LT1302CS8-5#TRPBF reliable?
The price and inventory of LT1302CS8-5#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1302CS8-5#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1302CS8-5#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1302CS8-5#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1302CS8-5#TRPBF?
LT1302CS8-5#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1302CS8-5#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 LT1302CS8-5#TRPBF?
For technical support, including LT1302CS8-5#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1302CS8-5#TRPBF requirements.
6.How does Aetrix verify that LT1302CS8-5#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1302CS8-5#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 LT1302CS8-5#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1302CS8-5#TRPBF?
All LT1302CS8-5#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1302CS8-5#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 LT1302CS8-5#TRPBF part is unused and in its original packaging.
Return procedure for LT1302CS8-5#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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