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Analog Devices Inc. LT1303CN8-5#PBF
- Part No.:
- LT1303CN8-5#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
LT1303CN8-5#PBF.pdf
- Description:
- IC REG BOOST 5V 750MA 8PDIP
- Quantity:
- Payment:
- Shipping:
Inventory:100
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Product details
Overview
LT1303CN8-5#PBF from Analog Devices (formerly Linear Technology) is a micropower fixed-output 5V step-up DC/DC converter with integrated low-battery detector and NPN switch, operating from 1.8V to 5V input, delivering up to 200mA at 5V with 88% peak efficiency and 120µA quiescent current. It targets space-constrained battery-powered systems such as bar-code scanners and PDAs.
For engineers reviewing the LT1303CN8-5#PBF datasheet, LT1303CN8-5#PBF pinout, LT1303CN8-5#PBF application, or LT1303CN8-5#PBF equivalent, key selection criteria include its fixed 5V output regulation (±4% over temperature), 170mV typical VCE(SAT) at 700mA, 1.24V internal reference, 155kHz typical oscillator frequency, and 8-lead PDIP package with validated thermal resistance of θJA = 130°C/W.
Technical Context
The LT1303CN8-5#PBF uses Burst Mode™ operation to maintain high efficiency at light loads, cycling between active switching and sleep states to minimize quiescent current. Its internal NPN power switch features low saturation voltage and is controlled by a hysteretic current comparator that limits peak switch current to 1.0A (typ) at 2V input.
It integrates a precision low-battery detector with LBI input threshold of 1.24V (±3%) and open-collector LBO output, disabled during shutdown. The fixed 5V output is set via internal resistor divider referenced to the 1.24V bandgap, yielding 5.0V ±4% (4.8V–5.2V) at the SENSE pin under specified conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0V ±4% (4.8V–5.2V); enables direct replacement of 5V LDOs in battery-powered logic rails. |
| Input Voltage Range | 1.8V to 5.0V; supports 2-cell alkaline (2.4V fresh → 2.0V cutoff) and 3-cell NiMH (3.6V → 3.0V) without external regulation. |
| Max Output Current | 200mA at 5V from 2V input; limited by internal 1.0A peak switch current and thermal design in PDIP package. |
| Quiescent Current | 120µA (typ) in active mode; drops to 7µA (typ) when SHDN = 1.8V, extending shelf life in always-on portable devices. |
| Switch VCE(SAT) | 170mV (typ) at 700mA; reduces conduction loss and improves efficiency at mid-load, critical for >80% efficiency at 100mA. |
| Oscillator Frequency | 155kHz (typ); balances EMI control and inductor size-enables use of compact 22µH surface-mount inductors. |
| Low-Battery Threshold | LBI trip at 1.24V ±3%; provides accurate 2.2V system-level battery warning when used with 100kΩ/316kΩ divider per Figure 1. |
Pinout & Package
LT1303CN8-5#PBF is housed in an 8-lead plastic DIP (PDIP) package (N8), with 0.300" wide body, 0.100" lead pitch, and θJA = 130°C/W. Leads are tin-lead plated, RoHS-compliant per #PBF suffix.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 1) | Signal ground reference | Must be tied to PGND under package; forms return path for FB/Sense and LBI comparators. |
| LBO (Pin 2) | Open-collector low-battery output | Sinks 100µA max; requires external pull-up; asserts low when LBI < 1.24V; disabled in shutdown. |
| SHDN (Pin 3) | Active-low shutdown control | Pull ≥1.8V to disable regulator and reduce IQ to 7µA; ground for normal operation. |
| SENSE (Pin 4) | 5V output feedback node | Internally connected to 5V divider; monitors regulated output; replaces external resistive divider of adjustable LT1303. |
| LBI (Pin 5) | Low-battery comparator input | High-impedance input (7nA bias); threshold 1.24V; used with resistor divider to set system battery cutoff. |
| VIN (Pin 6) | Main power input | Accepts 1.8V–5V; requires local 100µF electrolytic bypass to PGND within 0.2" for stability. |
| SW (Pin 7) | Internal NPN collector node | Connects to inductor and Schottky diode anode; high dv/dt node-requires short, low-inductance layout. |
| PGND (Pin 8) | Power ground return | Carries switch and diode return current; must tie to GND under package and connect VIN bypass capacitor directly. |
Key Features
| Feature | Design Value |
|---|---|
| Micropower Burst Mode™ operation | Enables 120µA IQ at no load while maintaining 5V regulation-critical for multi-year battery life in metering and IoT sensors. |
| Integrated low-battery detector | Eliminates need for external voltage supervisor IC; LBO provides clean, hysteresis-free flag for host microcontroller wake-up or display alert. |
| Low VCE(SAT) NPN switch | 170mV drop at 700mA reduces power loss by ~120mW vs. 300mV alternatives-directly enabling 88% efficiency at 200mA/5V. |
| Fixed 5V output architecture | Removes external feedback resistors, saving PCB area and BOM cost; eliminates resistor tolerance drift affecting output accuracy. |
| 8-lead PDIP package | Supports through-hole prototyping and legacy industrial assembly; provides robust thermal performance (130°C/W) without heatsink. |
Applications
| Bar-Code Scanners | Palmtop Computers |
|---|---|
Use Scenario: Powering CMOS image sensor and laser driver from two AA cells (2.0–3.2V). IC Role / Device Role / Timing Role: Step-up converter generating stable 5V rail for analog front-end and digital logic; low-battery detection triggers low-power mode before data corruption. Use Value: Delivers 200mA at 88% efficiency from 2V input, extending scanner runtime by >35% vs. linear regulators; LBO flag prevents misreads during brownout. |
Use Scenario: Supplying 5V to microcontroller, SRAM, and LCD controller in handheld organizer with 3×NiMH cells. IC Role / Device Role / Timing Role: Primary DC/DC regulator maintaining 5V output across full battery discharge curve (4.2V → 3.0V); SHDN enables software-controlled sleep. Use Value: 120µA quiescent current preserves battery charge during idle; fixed 5V output eliminates feedback resistor calibration drift over temperature. |
| Portable Instruments | Wireless Systems |
Use Scenario: Providing 5V for op-amp signal chain and ADC in handheld multimeter powered by two alkaline cells. IC Role / Device Role / Timing Role: High-efficiency boost converter with precise low-battery warning (LBO) to prompt battery replacement before measurement error. Use Value: 1.24V LBI threshold ensures reliable 2.2V system cutoff; 170mV VCE(SAT) minimizes heat rise in sealed enclosure. |
Use Scenario: Generating 5V for RF transceiver and MCU in Bluetooth LE sensor node using coin cell or 2×AAA. IC Role / Device Role / Timing Role: Micropower DC/DC converter enabling burst-mode transmission; SHDN synchronizes with radio sleep cycles to cut leakage. Use Value: 7µA shutdown current extends shelf life beyond 5 years; 155kHz switching avoids interference with 2.4GHz ISM band. |
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 |
|---|---|---|---|
| LT1305CS8-5#PBF | Higher 400mA output capability; 200µA quiescent current; SO-8 package; same 5V fixed output and LBO function. | Required for >200mA loads (e.g., GSM modem modules); unsuitable where PDIP hand-soldering or higher θJA is needed. | Select LT1305CS8-5#PBF only when load exceeds 200mA and SO-8 footprint is acceptable. |
| TPS61200DRCT | Adjustable output (0.9V–5.5V); 1.2A switch; 5.5µA shutdown current; 3mm × 3mm QFN; no integrated LBO. | Used where programmable voltage or ultra-low shutdown current is prioritized over battery monitoring; requires external supervisor. | Choose TPS61200DRCT for compact designs needing flexible VOUT and minimal shutdown drain, but add discrete LBO circuitry. |
Compared with LT1303CN8-5#PBF, LT1305CS8-5#PBF trades higher output current and smaller SO-8 footprint for increased quiescent current and loss of through-hole assembly compatibility, while TPS61200DRCT offers superior shutdown efficiency and density at the cost of added component count and absence of native low-battery signaling.
Availability
LT1303CN8-5#PBF is available at Aetrix Electronics and suitable for bar-code scanners, palmtop computers, portable instruments, wireless systems, and EL panel drivers requiring stable component supply across extended production lifecycles.
Supply support for LT1303CN8-5#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 high-performance analog and power management portfolio. Linear pioneered precision DC/DC conversion for low-power applications.
The LT1303 family was designed specifically for micropower, battery-operated systems demanding high efficiency below 200mA, fixed 5V output, and integrated power-good monitoring-targeting portable instrumentation and handheld computing.
FAQ
What is the maximum input voltage rating for the LT1303CN8-5#PBF?
The absolute maximum input voltage for the LT1303CN8-5#PBF is 10V, as specified in the Absolute Maximum Ratings table. However, the recommended operating range is strictly 1.8V to 5.0V for proper regulation and low-battery detection functionality. Exceeding 5.0V may cause unregulated output behavior or damage the internal 5V feedback network. Always observe the 10V limit to prevent permanent device failure.
Does the LT1303CN8-5#PBF require an external feedback resistor network?
No, the LT1303CN8-5#PBF does not require external feedback resistors. It is the fixed 5V version of the LT1303 family, with the SENSE pin internally connected to a precision resistor divider referenced to the 1.24V bandgap. This eliminates external components, reduces BOM cost, and ensures output accuracy of 5.0V ±4% without resistor tolerance drift-unlike the adjustable LT1303 which requires external FB resistors.
How does the low-battery detector in the LT1303CN8-5#PBF operate?
The LT1303CN8-5#PBF's low-battery detector compares the voltage on the LBI pin to an internal 1.24V reference. When LBI falls below 1.24V (±3%), the open-collector LBO pin pulls low, sinking up to 100µA. LBO is disabled during shutdown (SHDN ≥1.8V). For a 2.2V system cutoff, use a 100kΩ/316kΩ resistor divider from VIN to LBI as shown in Figure 1-no hysteresis is built-in unless externally added.
Can the LT1303CN8-5#PBF drive a 5V load requiring more than 200mA?
The LT1303CN8-5#PBF is rated for up to 200mA output at 5V from a 2V input, based on its 1.0A peak switch current limit and thermal limits of the PDIP package. Attempting >200mA risks thermal shutdown or reduced efficiency due to excessive power dissipation. For higher currents, Analog Devices recommends the LT1305CS8-5#PBF (400mA) or LT1302 (600mA), both pin-compatible in SO-8 but not in PDIP.
What type of inductor is recommended for use with the LT1303CN8-5#PBF?
An inductor with 10µH to 33µH inductance, ≥1.25A saturation current, and low DC resistance is recommended for the LT1303CN8-5#PBF. Examples include Sumida CD54-220 (22µH), Coilcraft D03316 (10–47µH), or Gowanda GA10 series. The inductor must avoid saturation below 1A-Figure 8 shows unacceptable rapid current rise if saturated-and must be placed close to SW and PGND pins to minimize EMI.
LT1303CN8-5#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:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 1.8V
- Voltage - Input (Max):
- 10V
- Voltage - Output (Min/Fixed):
- 5V
- Voltage - Output (Max):
- -
- 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
LT1303CN8-5#PBF FAQ
1.How can I place an order for LT1303CN8-5#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1303CN8-5#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 LT1303CN8-5#PBF reliable?
The price and inventory of LT1303CN8-5#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1303CN8-5#PBF is usually 5 days.
3.What payment methods are accepted for LT1303CN8-5#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1303CN8-5#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1303CN8-5#PBF?
LT1303CN8-5#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1303CN8-5#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 LT1303CN8-5#PBF?
For technical support, including LT1303CN8-5#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1303CN8-5#PBF requirements.
6.How does Aetrix verify that LT1303CN8-5#PBF is sourced from the original manufacturer or authorized distributors?
All LT1303CN8-5#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 LT1303CN8-5#PBF meets industry standards.
7.What is the process for return or replacement of LT1303CN8-5#PBF?
All LT1303CN8-5#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1303CN8-5#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 LT1303CN8-5#PBF part is unused and in its original packaging.
Return procedure for LT1303CN8-5#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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