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Analog Devices Inc. LT1303CS8#PBF
- Part No.:
- LT1303CS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1303CS8#PBF.pdf
- Description:
- IC REG BOOST ADJ 750MA 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:2,934
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Product details
Overview
LT1303CS8#PBF from Analog Devices (formerly Linear Technology) is a micropower adjustable step-up DC/DC converter with integrated low-battery detector and 1A NPN switch. It operates from 1.8V to 5V input, delivers up to 25V output, achieves 88% efficiency at 200mA into 5V, and draws only 120µA quiescent current - ideal for 2–3-cell battery-powered portable instruments and bar-code scanners.
For engineers reviewing the LT1303CS8#PBF datasheet, LT1303CS8#PBF pinout, LT1303CS8#PBF application, or LT1303CS8#PBF equivalent, key selection criteria include its 1.22V feedback reference, 155kHz typical oscillator frequency, 75–95% maximum duty cycle, 170mV typical VCE(SAT), and SO-8 package compatibility with space-constrained handheld designs.
Technical Context
The LT1303CS8#PBF uses Burst Mode™ operation to maintain high efficiency at light loads, cycling between active switching (2mA quiescent) and ultra-low-power standby (120µA). Its internal 1.24V reference feeds a hysteresis-compensated comparator that controls an oscillator-driven NPN power switch with 6µs nominal on-time.
It integrates a dedicated low-battery comparator (LBI/LBO) with 1.24V trip threshold and open-collector output, independent of shutdown control. The FB pin accepts external resistor dividers to set output voltage up to 25V, while internal current limiting protects against inductor saturation at ~1A peak switch current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 1.8V to 5V - supports direct operation from two or three alkaline/NiMH cells without pre-regulation. |
| Output Voltage Range | Adjustable up to 25V via FB pin divider - enables flexible rail generation beyond fixed 5V outputs. |
| Feedback Reference | 1.22V to 1.26V (typ 1.24V) - sets output accuracy and stability across temperature (±6mV hysteresis). |
| Switch Saturation Voltage | 130mV to 200mV at 700mA - minimizes conduction loss and improves efficiency in high-current boost stages. |
| Oscillator Frequency | 120kHz to 185kHz (typ 155kHz) - balances EMI, inductor size, and transient response for portable applications. |
| Quiescent Current | 120µA (typ) - extends battery life in always-on monitoring or sleep-mode systems. |
| Peak Switch Current | 0.75A to 1.25A (VIN = 2V) - defines maximum deliverable output power before current-limit activation. |
Pinout & Package
LT1303CS8#PBF is housed in an 8-lead plastic SOIC (SO-8) package with standard 1.27mm pitch, JEDEC MS-012AC compliant footprint, and θJA = 150°C/W thermal resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 1) | Signal ground reference | Must be tied to PGND under package; forms return path for FB, LBI, SHDN, and LBO circuits. |
| LBO (Pin 2) | Low-battery open-collector output | Sinks 100µA when VIN drops below LBI threshold; disabled during shutdown. |
| SHDN (Pin 3) | Active-low shutdown control | Pull low for normal operation; pull ≥1.8V to reduce supply current to 7µA. |
| FB (Pin 4) | Feedback input for output regulation | Connects to resistor divider from VOUT; comparator compares to 1.24V reference to regulate output. |
| LBI (Pin 5) | Low-battery comparator input | Monitors scaled input voltage; trips LBO when voltage falls below 1.24V ±30mV. |
| VIN (Pin 6) | Main power input | Accepts 1.8V–5V; requires local 47–100µF electrolytic bypass to PGND within 0.2″. |
| SW (Pin 7) | Collector of internal NPN switch | Drives external inductor/diode; layout must minimize loop area to suppress RF emissions. |
| PGND (Pin 8) | Power ground | High-current return for SW and VIN bypass; tie directly to GND under package for low-impedance path. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode™ operation | Maintains >80% efficiency down to 100µA load by gating full switching cycles - critical for intermittent sensor wake-ups. |
| Integrated low-battery detector | Dedicated comparator with 1.24V threshold and open-collector LBO output - eliminates need for external supervisor IC. |
| 1A-rated NPN switch with low VCE(SAT) | 170mV typ at 1A enables compact 22µH inductor use and reduces thermal stress in SO-8 package. |
| Adjustable output up to 25V | FB pin accepts standard resistor dividers - supports custom rails for LCD bias, EL panel drive, or analog front-ends. |
| 120µA quiescent current | Enables >1-year battery life in 2-cell AA systems powering low-duty-cycle instrumentation. |
Applications
| Portable Instrumentation | Bar-Code Scanners |
|---|---|
|
Use Scenario: Handheld multimeter or data logger powered by two AA cells, requiring stable 5V and 12V rails for MCU and analog circuitry. IC Role / Device Role / Timing Role: Primary step-up regulator generating 5V from 2.4–3.2V battery input; FB pin configured for dual-rail output via post-regulation. Use Value: 88% efficiency at 200mA and 120µA quiescent current extend battery runtime beyond 500 operating hours per set. |
Use Scenario: Battery-operated laser scanner needing 5V for logic and 15–20V for laser diode driver. IC Role / Device Role / Timing Role: Adjustable boost converter supplying programmable high-voltage rail; LBO triggers low-power mode when battery reaches 2.2V. Use Value: Integrated LBI/LBO eliminates discrete voltage monitor, reducing BOM count and PCB area in compact scanner modules. |
| Palmtop Computers | EL Panel Drivers |
|
Use Scenario: Early PDA design requiring regulated 3.3V and 5V from single 3.6V Li-ion cell with minimal board space. IC Role / Device Role / Timing Role: Primary DC/DC converter stepping up 3.6V to 5V; SHDN pin synchronized to CPU sleep state for dynamic power gating. Use Value: SO-8 package and 155kHz switching enable small filter components - total solution fits within 0.5″ × 0.5″ footprint. |
Use Scenario: Backlight driver for monochrome LCD using electroluminescent (EL) panel requiring 80–115VRMS AC. IC Role / Device Role / Timing Role: Boost controller feeding transformer primary; FB pin regulates intermediate DC bus driving H-bridge inverter. Use Value: Adjustable output and burst-mode efficiency allow consistent brightness over full battery discharge curve (2.0V–3.6V). |
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 |
|---|---|---|---|
| LT1302CS8#PBF | Fixed 5V output; higher 600mA output current; 200µA quiescent current | Optimized for 2–3-cell to 5V conversion only; no adjustable output or EL panel support | Select when fixed 5V rail and higher current are required, and output adjustability is unnecessary. |
| LT1305CS8#PBF | 2A switch current rating; same 120µA quiescent; includes soft-start and thermal shutdown | Supports higher-power loads (e.g., 5V@400mA); larger inductor required; more complex compensation | Choose for applications demanding >200mA continuous output where LT1303CS8#PBF approaches current limit. |
Compared with LT1302CS8#PBF and LT1305CS8#PBF, the LT1303CS8#PBF uniquely balances ultra-low quiescent current, output adjustability up to 25V, and SO-8 integration - making it optimal for multi-rail, battery-sensitive portable systems where flexibility and runtime are prioritized over raw current capacity.
Availability
LT1303CS8#PBF is available at Aetrix Electronics and suitable for portable instrumentation, bar-code scanners, palmtop computers, EL panel drivers, and wireless sensor nodes requiring stable component supply with long-lifecycle support.
Supply support for LT1303CS8#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 full technical and manufacturing continuity for legacy Linear power products.
The LT1303CS8#PBF belongs to Linear's micropower DC/DC converter family, designed specifically for space- and energy-constrained battery-operated systems requiring high light-load efficiency and integrated supervision functions.
FAQ
What is the maximum output voltage achievable with LT1303CS8#PBF?
The LT1303CS8#PBF is an adjustable boost converter with no internal output voltage clamp. Using the FB pin and external resistor divider, it can regulate outputs up to 25V - confirmed in the datasheet's "DESCRIPTION" section and Figure 1303 TA03. This capability makes LT1303CS8#PBF suitable for EL panel drivers and multi-rail portable systems requiring non-standard voltages beyond 5V.
Does LT1303CS8#PBF support true shutdown with near-zero current draw?
Yes. When the SHDN pin is pulled high to ≥1.8V, LT1303CS8#PBF enters shutdown mode drawing only 7µA (typ) from VIN - specified in the Electrical Characteristics table under "Quiescent Current, VSHDN = 1.8V". This ultra-low shutdown current preserves battery charge during extended storage or system sleep states, distinguishing LT1303CS8#PBF from converters with higher leakage in disable mode.
How does the low-battery detector in LT1303CS8#PBF operate independently of the main regulator?
The LT1303CS8#PBF integrates a dedicated low-battery comparator with LBI input and open-collector LBO output. It remains functional even when the main regulator is disabled via SHDN, as stated in the "PIN FUNCTIONS" section: "LBO is disabled when device is in shutdown". The LBI threshold is fixed at 1.24V ±30mV, allowing direct connection to VIN via resistor divider - enabling precise battery monitoring without affecting LT1303CS8#PBF's regulation loop.
Can LT1303CS8#PBF drive a 22µH inductor reliably at 200mA output?
Yes. The LT1303CS8#PBF datasheet explicitly validates 22µH inductors in multiple典型 applications, including Figure 1303 TA02 (2-cell to 5V) and Figure 1303 TA03 (adjustable output). With its 1A peak switch current rating and 170mV VCE(SAT), LT1303CS8#PBF sustains 200mA continuous output using Sumida CD54-220 or equivalent drum-core inductors - confirmed in the "Inductor Section" and Table 1.
What is the purpose of the PGND pin in LT1303CS8#PBF, and why is it separate from GND?
PGND (Pin 8) is the dedicated power ground return for high-pulse currents from the internal NPN switch and VIN bypass capacitor, while GND (Pin 1) serves as the quiet signal ground reference for FB, LBI, SHDN, and LBO. Separating them minimizes noise coupling into sensitive analog circuits - a requirement emphasized in the "PIN FUNCTIONS" description: "Tie to signal ground (pin 1) under the package" and "Bypass capacitor from VIN should be tied directly to PGND within 0.2″". This dual-ground architecture is essential for stable regulation in LT1303CS8#PBF.
LT1303CS8#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- 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:
- Surface Mount
- Supplier Device Package:
- 8-SO
LT1303CS8#PBF FAQ
1.How can I place an order for LT1303CS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1303CS8#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 LT1303CS8#PBF reliable?
The price and inventory of LT1303CS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1303CS8#PBF is usually 5 days.
3.What payment methods are accepted for LT1303CS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1303CS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1303CS8#PBF?
LT1303CS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1303CS8#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 LT1303CS8#PBF?
For technical support, including LT1303CS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1303CS8#PBF requirements.
6.How does Aetrix verify that LT1303CS8#PBF is sourced from the original manufacturer or authorized distributors?
All LT1303CS8#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 LT1303CS8#PBF meets industry standards.
7.What is the process for return or replacement of LT1303CS8#PBF?
All LT1303CS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1303CS8#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 LT1303CS8#PBF part is unused and in its original packaging.
Return procedure for LT1303CS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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