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Analog Devices Inc. LT1303CN8#PBF
- Part No.:
- LT1303CN8#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
LT1303CN8#PBF.pdf
- Description:
- IC REG BOOST ADJ 750MA 8PDIP
- Quantity:
- Payment:
- Shipping:
Inventory:138
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Product details
Overview
LT1303CN8#PBF from Analog Devices (formerly Linear Technology) is a micropower step-up DC/DC converter with integrated low-battery detector and fixed 5V output. It operates from 1.8V to 5V input, delivers up to 200mA at 5V, achieves 88% efficiency at 2V input, and features 120µA quiescent current and 170mV switch saturation voltage. It is used in 2-cell battery-powered portable instruments and bar-code scanners.
For engineers reviewing the LT1303CN8#PBF datasheet, LT1303CN8#PBF pinout, LT1303CN8#PBF application, or LT1303CN8#PBF equivalent, key selection criteria include input voltage range (1.8–5V), fixed 5V output accuracy (±4%), low-battery detection threshold (1.24V on LBI), shutdown current (7µA), and PDIP-8 package compatibility with legacy through-hole layouts.
Technical Context
The LT1303CN8#PBF uses Burst Mode™ operation to maintain high efficiency at light loads, cycling the internal NPN switch only when output voltage drops below regulation. Its feedback loop references a precision 1.24V bandgap, with the LT1303-5 variant using an internal resistor divider to fix output at 5V ±4%.
It integrates a low-battery comparator with open-collector LBO output that asserts low when LBI voltage falls below 1.24V (±30mV hysteresis), and a 1A peak switch with 170mV VCE(SAT) at 700mA - enabling compact, low-loss boost topologies using inexpensive surface-mount inductors and Schottky diodes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5V ±4% - eliminates external feedback resistors and simplifies layout for 5V rail generation. |
| Input Voltage Range | 1.8V to 5V - supports direct operation from 2 alkaline or NiMH cells without pre-regulation. |
| Max Output Current | 200mA at 5V from 2V input - sufficient for microcontrollers, sensors, and small displays in portable systems. |
| Quiescent Current | 120µA typical - enables multi-year battery life in always-on low-power monitoring applications. |
| Switch VCE(SAT) | 170mV at 700mA - minimizes conduction loss and thermal rise in the integrated NPN power switch. |
| Oscillator Frequency | 155kHz typical - balances EMI control and inductor size; frequency varies ±15% over temperature and supply. |
| Low-Battery Threshold | LBI trip at 1.24V ±30mV - provides reliable end-of-life detection for 2-cell systems with ~2.2V cutoff. |
Pinout & Package
LT1303CN8#PBF is housed in an 8-lead plastic DIP (PDIP-8) package with 0.300" wide body and 0.100" lead pitch, suitable for through-hole prototyping and industrial PCBs requiring mechanical robustness and thermal relief via ground-plane soldering.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 1) | Signal Ground Reference | Primary analog ground node; must be tied to PGND under the package to minimize noise coupling into feedback path. |
| LBO (Pin 2) | Open-Collector Low-Battery Output | Sinks 100µA when active; requires external pull-up for logic-level interface to MCU or supervisor IC. |
| SHDN (Pin 3) | Active-Low Shutdown Control | Pull to GND for normal operation; drive >1.8V to disable switching and reduce IQ to 7µA. |
| SENSE (Pin 4) | 5V Output Sense Input | Connects internally to 5V regulator divider; no external components required for fixed-output operation. |
| LBI (Pin 5) | Low-Battery Comparator Input | Monitor point for external resistive divider; triggers LBO when voltage drops below 1.24V. |
| VIN (Pin 6) | Main Power Input | Accepts 1.8–5V; requires ≥47µF low-ESR capacitor placed within 0.2" of pin to suppress switching noise. |
| SW (Pin 7) | Internal NPN Switch Collector | Drives external inductor/diode; layout must minimize trace inductance to reduce EMI and voltage spikes. |
| PGND (Pin 8) | Power Ground Return | High-current return path for switch and input capacitor; tie directly to VIN bypass capacitor and GND under package. |
Key Features
| Feature | Design Value |
|---|---|
| Micropower Burst Mode™ Operation | Enables 120µA quiescent current and stable regulation down to µA load levels without external bias networks. |
| Integrated 5V Fixed Feedback | Eliminates external resistor divider, reducing BOM count and layout sensitivity while maintaining ±4% output tolerance. |
| On-Chip 1A NPN Power Switch | Reduces external component count and PCB area; 170mV VCE(SAT) at 700mA ensures <120mW conduction loss at full load. |
| Programmable Low-Battery Detection | LBI input accepts user-defined voltage divider, allowing precise end-of-life cutoff (e.g., 2.2V for 2-cell alkaline) with hysteresis support. |
| Robust 8-Lead PDIP Package | Provides mechanical stability, thermal mass for pulse-load dissipation, and compatibility with wave-solder and manual rework processes. |
Applications
| 2-Cell to 5V Portable Instruments | Bar-Code Scanners |
|---|---|
Use Scenario: Battery-powered handheld multimeters and data loggers operating from two AA/AAA cells. IC Role / Device Role / Timing Role: Primary 5V power rail generator with low-battery warning to prevent measurement corruption during voltage sag. Use Value: Delivers regulated 5V at 200mA from 1.8V input with 88% efficiency, extending battery life beyond 100 hours per set of alkalines. | Use Scenario: Handheld laser or CCD-based bar-code readers requiring clean 5V for sensor and decoder ICs. IC Role / Device Role / Timing Role: Step-up converter supplying stable 5V to imaging sensor and microcontroller, synchronized with trigger pulses. Use Value: 120µA quiescent current preserves standby time; Burst Mode™ prevents audible coil whine during intermittent scanning. |
| Palmtop Computers | Wireless Sensor Nodes |
Use Scenario: Early-generation PDAs and organizers with limited board space and dual-cell battery packs. IC Role / Device Role / Timing Role: Main system voltage regulator powering CPU, display driver, and serial interface ICs. Use Value: PDIP-8 footprint allows easy integration into dense hand-soldered boards; fixed 5V output avoids calibration drift from resistor tolerances. | Use Scenario: Zigbee or Bluetooth LE sensor nodes powered by coin cells or small Li-ion batteries. IC Role / Device Role / Timing Role: Boost converter enabling 3.3V or 5V MCU/peripheral operation from single-cell 2.0–3.6V sources. Use Value: Shutdown pin reduces system sleep current to <10µA; LBO output signals battery replacement before brownout resets. |
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 |
|---|---|---|---|
| LT1303CS8#PBF | Same electrical specs but in 8-lead SOIC package - smaller footprint, surface-mount only, higher θJA (150°C/W). | Preferred for automated SMT assembly and space-constrained PCBs; unsuitable for through-hole or high-reliability vibration environments. | Select when board real estate is critical and thermal management via copper pour is feasible. |
| LT1305CS8#PBF | Higher 400mA output capability, same 1.8–5V input, but 200µA quiescent current and different pinout. | Used where sustained 300+ mA loads exist (e.g., RF transceivers); requires redesign of feedback and shutdown circuitry. | Choose only if load current exceeds 200mA - not a drop-in replacement due to pin mismatch and higher IQ. |
Compared with LT1303CS8#PBF, the LT1303CN8#PBF offers superior mechanical ruggedness and thermal mass in PDIP packaging, while LT1305CS8#PBF trades off quiescent current for higher output current - making the LT1303CN8#PBF optimal for cost-sensitive, low-IQ, through-hole portable designs.
Availability
LT1303CN8#PBF is available at Aetrix Electronics and suitable for portable instruments, bar-code scanners, and palmtop computers requiring stable component supply, long-lifecycle availability, and through-hole manufacturability.
Supply support for LT1303CN8#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 its portfolio of high-performance analog and power management ICs with emphasis on reliability and precision.
The LT1303 product line was designed specifically for ultra-low-power, battery-operated boost conversion in space- and energy-constrained portable electronics - prioritizing micropower operation, integrated protection, and minimal external component count.
FAQ
What is the maximum input voltage rating for the LT1303CN8#PBF?
The LT1303CN8#PBF has an absolute maximum input voltage rating of 10V. However, its specified operating input range is 1.8V to 5V for proper regulation and low-battery detection functionality. Exceeding 5V may cause unregulated output behavior or damage the internal switch if sustained, and is outside the validated performance envelope documented in the datasheet.
Does the LT1303CN8#PBF require external feedback resistors to set the output voltage?
No. The LT1303CN8#PBF is the fixed 5V version (LT1303-5 variant) and contains an internal resistor divider connected to the SENSE pin. Unlike the adjustable LT1303, the LT1303CN8#PBF delivers 5V ±4% without any external feedback components - simplifying design and improving output accuracy across temperature and load.
How does the low-battery detector function on the LT1303CN8#PBF?
The LT1303CN8#PBF's low-battery detector monitors voltage at the LBI pin. When LBI falls below 1.24V (±30mV hysteresis), the open-collector LBO pin pulls low. This signal remains active until LBI rises above 1.27V. The detector is disabled during shutdown (SHDN high), and LBO leakage is <5µA when inactive - ensuring minimal impact on battery drain.
Can the LT1303CN8#PBF drive a 5V load requiring 300mA continuously?
No. The LT1303CN8#PBF is rated for up to 200mA output at 5V from a 2V input. Attempting 300mA continuous load will exceed its peak switch current limit (~1.25A) and thermal limits in PDIP packaging, causing output droop or thermal shutdown. For higher current, consider the LT1305CS8#PBF or LT1302CN8#PBF - both explicitly rated for ≥400mA and ≥600mA respectively.
What is the recommended inductor value and type for use with the LT1303CN8#PBF?
The LT1303CN8#PBF works optimally with 22µH to 33µH surface-mount inductors rated for ≥1.25A saturation current and low DC resistance - such as Sumida CD54-220 or Coilcraft D03316 series. These values balance efficiency, transient response, and physical size. Inductor saturation must be avoided; ripple current should remain below 400mA/µs to ensure stable Burst Mode™ operation.
LT1303CN8#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Step-Up
- Output Configuration:
- Positive
- Topology:
- Boost
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 1.8V
- Voltage - Input (Max):
- 10V
- Voltage - Output (Min/Fixed):
- 1.24V
- Voltage - Output (Max):
- 25V (Switch)
- Current - Output:
- 750mA (Switch)
- Frequency - Switching:
- 155kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
LT1303CN8#PBF FAQ
1.How can I place an order for LT1303CN8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1303CN8#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 LT1303CN8#PBF reliable?
The price and inventory of LT1303CN8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1303CN8#PBF is usually 5 days.
3.What payment methods are accepted for LT1303CN8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1303CN8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1303CN8#PBF?
LT1303CN8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1303CN8#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 LT1303CN8#PBF?
For technical support, including LT1303CN8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1303CN8#PBF requirements.
6.How does Aetrix verify that LT1303CN8#PBF is sourced from the original manufacturer or authorized distributors?
All LT1303CN8#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 LT1303CN8#PBF meets industry standards.
7.What is the process for return or replacement of LT1303CN8#PBF?
All LT1303CN8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1303CN8#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 LT1303CN8#PBF part is unused and in its original packaging.
Return procedure for LT1303CN8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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