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Analog Devices Inc. LT1303IN8-5#PBF
- Part No.:
- LT1303IN8-5#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
LT1303IN8-5#PBF.pdf
- Description:
- IC REG BOOST 5V 750MA 8PDIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,375
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Product details
Overview
LT1303IN8-5#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–5V input and delivering up to 200mA at 5V with 88% peak efficiency. It features 120µA quiescent current, 170mV typical switch saturation voltage at 700mA, and an open-collector LBO output for battery monitoring in portable instrumentation.
For engineers reviewing the LT1303IN8-5#PBF datasheet, LT1303IN8-5#PBF pinout, LT1303IN8-5#PBF application, or LT1303IN8-5#PBF equivalent, key selection criteria include input voltage range (1.8V–5V), regulated 5V output tolerance (±4%), low-battery detection threshold (1.24V on LBI), shutdown current (7µA typ), and PDIP-8 package compatibility with legacy through-hole layouts.
Technical Context
The LT1303IN8-5#PBF uses Burst Mode™ operation to maintain regulation under light loads while minimizing quiescent current. Its internal 1.24V reference feeds a hysteresis comparator that controls oscillator enablement, resulting in discontinuous conduction mode with 155kHz typical switching frequency and 6µs nominal on-time.
It integrates a low-VCE(SAT) NPN power switch (170mV @ 700mA), dedicated PGND and GND pins for noise isolation, and a precision low-battery comparator with 1.24V trip point and 22mV hysteresis-enabling reliable battery state indication without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0V ±4% - eliminates external feedback resistors; stable for 2–3 cell alkaline/NiMH systems. |
| Input Voltage Range | 1.8V to 5.0V - supports single Li-ion, 2-cell NiMH/alkaline, or partially discharged batteries. |
| Max Output Current | 200mA at VIN = 2V - sufficient for microcontrollers, sensors, and small displays without thermal derating. |
| Quiescent Current | 120µA typ - extends battery life in always-on monitoring applications like bar-code scanners. |
| Switch Saturation Voltage | 170mV typ @ 700mA - reduces conduction loss and improves efficiency below 3V input. |
| Low-Battery Threshold | 1.24V ±3% on LBI pin - triggers LBO open-collector output low when battery drops below safe operating level. |
| Oscillator Frequency | 155kHz typ - balances EMI control and inductor size; enables use of compact 22µH surface-mount inductors. |
Pinout & Package
LT1303IN8-5#PBF is housed in an 8-lead plastic DIP (PDIP-8) package with 0.300" wide body, compatible with standard through-hole PCB assembly and socketing. Pin 1 is GND, and thermal performance is characterized with θJA = 130°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 1) | Signal Ground Reference | Return path for FB/Sense, SHDN, and LBI comparators; must be tied to PGND under package. |
| LBO (Pin 2) | Low-Battery Open-Collector Output | Sinks 100µA when LBI < 1.24V; requires external pull-up for logic-level interface to MCU. |
| SHDN (Pin 3) | Active-Low Shutdown Control | Pull high (>1.8V) to disable regulator and reduce current to 7µA; grounded for normal operation. |
| SENSE (Pin 4) | Fixed 5V Output Feedback | Internally connected to resistor divider; monitors output and regulates to 5.0V ±4%. |
| LBI (Pin 5) | Low-Battery Input Comparator | High-impedance input (7nA bias); voltage divider from VIN sets battery trip point (e.g., 2.2V → 1.24V). |
| VIN (Pin 6) | Main Power Input | Accepts 1.8V–5V; requires ≥47µF electrolytic bypass capacitor placed within 0.2" of pin. |
| SW (Pin 7) | NPN Switch Collector | Drives external inductor/diode; layout must minimize trace length to reduce EMI and switching losses. |
| PGND (Pin 8) | Power Ground Return | Return path for switch current; tie directly to VIN bypass capacitor and GND under package. |
Key Features
| Feature | Design Value |
|---|---|
| Micropower Burst Mode™ Operation | Enables 120µA quiescent current across full load range, extending battery runtime in intermittent-use devices. |
| Integrated Low-Battery Detector | Provides accurate 1.24V threshold with 22mV hysteresis-no external comparator or reference needed. |
| Low-VCE(SAT) NPN Switch | 170mV saturation at 700mA reduces conduction loss by >30% vs. typical 300mV switches at low input voltages. |
| Dual Ground Pins (GND + PGND) | Separates signal and power return paths to suppress noise coupling into sensitive analog circuitry. |
| Fixed 5V Output Architecture | Eliminates external feedback network, reducing BOM count and layout sensitivity in cost-sensitive designs. |
Applications
| Bar-Code Scanners | Palmtop Computers |
|---|---|
Use Scenario: Battery-powered handheld scanner requiring regulated 5V for laser diode driver and CMOS image sensor. IC Role / Device Role / Timing Role: Primary step-up regulator supplying 5V/200mA from two AA cells; LBO signals end-of-life battery to host MCU. Use Value: 88% efficiency at 2V input preserves battery capacity; 120µA quiescent current minimizes standby drain during idle periods. | Use Scenario: Compact palmtop running low-power CPU and LCD, powered by 2–3 NiMH cells. IC Role / Device Role / Timing Role: Fixed 5V supply for logic rails and peripheral interfaces; SHDN enables system-level power gating. Use Value: PDIP-8 package allows manual rework and prototyping; dual ground pins prevent display noise from corrupting touch controller signals. |
| Portable Instruments | Wireless Systems |
Use Scenario: Handheld multimeter or data logger using alkaline batteries and requiring stable 5V for ADC and RF module. IC Role / Device Role / Timing Role: Main DC/DC converter with low-battery warning; SENSE pin ensures tight 5V regulation despite battery voltage sag. Use Value: 1.8V minimum input supports operation down to ~1.0V/cell; LBO hysteresis prevents chatter near cutoff. | Use Scenario: Bluetooth LE sensor node with intermittent transmission bursts and long sleep intervals. IC Role / Device Role / Timing Role: Efficient 5V rail generator during active transmit; enters ultra-low-IQ mode between transmissions. Use Value: 7µA shutdown current enables multi-year battery life; 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 |
|---|---|---|---|
| LT1303CN8-5 | Same silicon, commercial-grade (0°C to 70°C) vs. industrial-grade (–40°C to 85°C) for LT1303IN8-5#PBF. | No LBO hysteresis spec in CN8 datasheet; IN8-5 guarantees 22mV min hysteresis over full temp range. | Select LT1303IN8-5#PBF for extended temperature reliability in outdoor or industrial portable equipment. |
| LT1305CS8 | Higher output current (400mA), SO-8 package, same 1.8V–5V input but no fixed 5V option-requires external feedback. | Delivers more power but increases BOM count and layout complexity; lacks integrated LBO function. | Choose LT1305CS8 only if >200mA is required and space permits SO-8 footprint plus feedback resistors. |
Compared with LT1303CN8-5, LT1303IN8-5#PBF offers guaranteed industrial temperature operation and tighter low-battery hysteresis control; versus LT1305CS8, it trades higher current capability for simpler fixed-output implementation and lower system-level component count.
Availability
LT1303IN8-5#PBF is available at Aetrix Electronics and suitable for portable instrumentation, bar-code scanners, and wireless sensor nodes requiring stable component supply with industrial temperature support and legacy through-hole compatibility.
Supply support for LT1303IN8-5#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 IC portfolio, emphasizing precision power management and signal conditioning for demanding applications.
The LT1303 family was designed specifically for ultra-low-power, battery-operated systems needing compact, efficient step-up conversion with integrated battery monitoring-targeting portable medical, test equipment, and handheld computing.
FAQ
What is the maximum input voltage rating for the LT1303IN8-5#PBF?
The LT1303IN8-5#PBF has an absolute maximum input voltage rating of 10V, but its specified operating input range is 1.8V to 5.0V. Exceeding 5.0V may cause unregulated output or damage the internal switch. The device's 10V rating allows for transient spikes up to that level when properly decoupled with a 47µF–100µF input capacitor placed within 0.2" of the VIN and PGND pins.
Does the LT1303IN8-5#PBF require external components to set the output voltage?
No, the LT1303IN8-5#PBF provides a fixed 5.0V output and does not require external feedback resistors. Its SENSE pin connects internally to a precision resistor divider calibrated to regulate at 5.0V ±4%. This simplifies design and improves stability compared to adjustable versions like the LT1303, which require two external resistors to set VOUT.
How does the low-battery detector function in the LT1303IN8-5#PBF?
The LT1303IN8-5#PBF's low-battery detector compares voltage on the LBI pin to an internal 1.24V reference. When LBI falls below this threshold, the open-collector LBO pin pulls low (≤0.4V @ 100µA). Hysteresis of 22mV prevents oscillation near the trip point. An external resistor divider from VIN to LBI sets the actual battery voltage threshold-for example, a 412kΩ/100kΩ divider triggers at 2.2V.
Can the LT1303IN8-5#PBF drive a 5V load requiring more than 200mA?
The LT1303IN8-5#PBF is rated for up to 200mA continuous output at VIN = 2V. Attempting higher loads causes thermal stress and potential dropout due to switch saturation and inductor limitations. For >200mA applications, Analog Devices recommends the LT1305 (400mA) or LT1302 (600mA). Derating is required above 25°C ambient; at 70°C, max output drops to ~150mA.
What package type and lead finish does the LT1303IN8-5#PBF use?
The LT1303IN8-5#PBF uses an 8-lead plastic DIP (PDIP-8) package with lead-free (Pb-free) matte tin finish, indicated by the "#PBF" suffix. It conforms to RoHS Directive 2011/65/EU and JEDEC J-STD-020 moisture sensitivity level 1. The package measures 0.300" × 0.400" with 0.100" lead pitch and is suitable for wave soldering and hand assembly.
LT1303IN8-5#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
LT1303IN8-5#PBF FAQ
1.How can I place an order for LT1303IN8-5#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1303IN8-5#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 LT1303IN8-5#PBF reliable?
The price and inventory of LT1303IN8-5#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1303IN8-5#PBF is usually 5 days.
3.What payment methods are accepted for LT1303IN8-5#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1303IN8-5#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1303IN8-5#PBF?
LT1303IN8-5#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1303IN8-5#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 LT1303IN8-5#PBF?
For technical support, including LT1303IN8-5#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1303IN8-5#PBF requirements.
6.How does Aetrix verify that LT1303IN8-5#PBF is sourced from the original manufacturer or authorized distributors?
All LT1303IN8-5#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 LT1303IN8-5#PBF meets industry standards.
7.What is the process for return or replacement of LT1303IN8-5#PBF?
All LT1303IN8-5#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1303IN8-5#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 LT1303IN8-5#PBF part is unused and in its original packaging.
Return procedure for LT1303IN8-5#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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