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Analog Devices Inc. LT1303CS8-5#PBF
- Part No.:
- LT1303CS8-5#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1303CS8-5#PBF.pdf
- Description:
- IC REG BOOST 5V 750MA 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:399
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Product details
Overview
LT1303CS8-5#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 power switch. It operates from 1.8V to 5V input, delivers up to 200mA at 5V output, achieves 88% peak efficiency, and draws only 120µA quiescent current - ideal for 2-cell alkaline or Li-ion–powered portable instrumentation.
For engineers reviewing the LT1303CS8-5#PBF datasheet, LT1303CS8-5#PBF pinout, LT1303CS8-5#PBF application, or LT1303CS8-5#PBF equivalent, key selection criteria include its fixed 5V output regulation (±4% over temperature), 170mV typical VCE(SAT) at 700mA, open-collector LBO with 1.24V trip threshold, and SO-8 package compatibility with space-constrained battery-operated designs.
Technical Context
The LT1303CS8-5#PBF uses Burst Mode™ operation to maintain high efficiency at light loads, cycling between active switching (155kHz typical oscillator frequency) and sleep mode. Its internal 1.24V reference and resistor-string feedback network fix the output at 5.0V ±2%, eliminating external resistors required by the adjustable LT1303 variant.
It integrates a low-VCE(SAT) NPN switch (170mV typ. at 700mA), a hysteresis-enabled low-battery comparator (LBI input, LBO open-drain output), and shutdown control (SHDN pin). The device supports inductor-based boost topology with no external diode driver needed, and features thermal shutdown protection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0V ±2% (guaranteed 4.8V–5.2V over temp); eliminates need for external feedback divider. |
| Input Voltage Range | 1.8V to 5.0V; supports 2-cell alkaline (2.4V fresh → 1.8V cutoff) and single Li-ion (3.0–4.2V) inputs. |
| Max Output Current | 200mA at 5V from 2V input; limited by internal 1A peak switch current and thermal design. |
| Quiescent Current | 120µA typical (VSHDN = 0.5V); enables >1-year battery life in always-on sensor nodes. |
| Low-Battery Threshold | LBI trip at 1.24V ±30mV; sets ~2.2V system-level battery cutoff when used with 100kΩ/316kΩ divider. |
| Switch Saturation VCE | 170mV typical at 700mA; reduces conduction loss and improves efficiency vs. MOSFET-based alternatives. |
| Oscillator Frequency | 155kHz typical; balances EMI, inductor size, and light-load efficiency in Burst Mode™ operation. |
Pinout & Package
LT1303CS8-5#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 reference for FB/Sense and comparator circuits. |
| LBO (Pin 2) | Low-battery open-collector output | Sinks 100µA max; asserts low when LBI < 1.24V; disabled during shutdown. |
| SHDN (Pin 3) | Active-low shutdown control | Pull low for normal operation; pull ≥1.8V to reduce supply current to 7µA. |
| SENSE (Pin 4) | Fixed 5V output voltage sense input | Internally connected to 5V feedback divider; no external resistors required. |
| LBI (Pin 5) | Low-battery comparator input | Monitors scaled battery voltage; trip threshold = 1.24V ±30mV. |
| VIN (Pin 6) | Main power input | Accepts 1.8–5V; requires local 47–100µF electrolytic bypass to PGND within 5mm. |
| SW (Pin 7) | Internal NPN switch collector | Connects to inductor and Schottky diode anode; layout must minimize loop area for EMI control. |
| PGND (Pin 8) | Power ground return | Carries high pulsed switch current; tie directly to VIN bypass capacitor and GND under package. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode™ operation | Maintains >80% efficiency down to 100µA load by gating full switching cycles - critical for intermittent-sensing applications. |
| Integrated low-battery detector | Provides system-level battery monitoring without external comparators or voltage references; LBO drives LED or microcontroller interrupt. |
| Low-VCE(SAT) NPN switch | 170mV typical saturation voltage reduces conduction loss and heat rise - enables use of smaller inductors and no heatsink in SO-8. |
| Fixed 5V output configuration | Eliminates external feedback resistors and associated layout sensitivity; simplifies BOM and improves production yield. |
| Shutdown current ≤7µA | Extends shelf life and enables ultra-low-power wake-on-event architectures when paired with external logic. |
Applications
| Handheld Barcode Scanners | Palmtop Computers |
|---|---|
Use Scenario: Powering 5V CCD image sensors and decode ICs from two AA cells (2.4V–1.8V). IC Role / Device Role / Timing Role: Primary 5V rail generator with battery-gauge function via LBO signal. Use Value: Delivers stable 5V at 200mA while detecting end-of-life battery voltage (2.2V) to trigger low-power mode before system reset. |
Use Scenario: Supplying 5V logic and display backlight drivers in compact clamshell PDAs. IC Role / Device Role / Timing Role: Step-up regulator with integrated shutdown and battery monitoring for system power management unit. Use Value: Enables automatic sleep/wake using SHDN and LBO signals, reducing average system current to <100µA in standby. |
| Portable Medical Instruments | Wireless Sensor Nodes |
Use Scenario: Powering 5V analog front-ends and microcontrollers in battery-operated glucose meters or pulse oximeters. IC Role / Device Role / Timing Role: Primary DC/DC converter with precision low-battery warning to ensure clinical data integrity before shutdown. Use Value: 1.24V LBI threshold provides accurate 2.2V system cutoff across temperature (±30mV hysteresis prevents chatter). |
Use Scenario: Generating 5V for RF transceivers and sensors from coin-cell or Li-SOCl₂ batteries in industrial IoT endpoints. IC Role / Device Role / Timing Role: Micropower boost converter enabling multi-year operation via 120µA quiescent current and burst-mode efficiency. Use Value: Achieves 88% peak efficiency at 50mA load, extending 200mAh CR2450 battery life to >3 years in 10-second transmit duty cycle. |
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#PBF | Higher 400mA output, 2A switch, same 5V fixed output and LBO; 200µA IQ. | Supports higher-current peripherals (e.g., GSM modules); larger thermal footprint required. | Select when >200mA sustained load or higher peak current is needed; not drop-in due to different current limit behavior. |
| TPS61200DRCR | Adjustable output (0.9–5.5V), 1.2A switch, 500kHz fixed-frequency PWM; 120µA IQ. | Lacks integrated low-battery detector; requires external comparator and reference for battery monitoring. | Choose for systems needing programmable output or higher switching frequency; adds BOM cost and layout complexity for LBO function. |
Compared with LT1303CS8-5#PBF, LT1305CS8#PBF offers higher output current but increases quiescent current and thermal demand, while TPS61200DRCR provides flexibility and speed at the cost of losing integrated battery monitoring - making LT1303CS8-5#PBF optimal for cost-sensitive, space-constrained 200mA 5V applications requiring built-in battery health signaling.
Availability
LT1303CS8-5#PBF is available at Aetrix Electronics and suitable for handheld barcode scanners, portable medical instruments, palmtop computers, and wireless sensor nodes requiring stable component supply with long-term manufacturability.
Supply support for LT1303CS8-5#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 full product support, datasheets, and application engineering for legacy Linear parts including the LT1303 family.
The LT1303 series was designed specifically for ultra-low-power, small-footprint boost conversion in battery-powered portable electronics - emphasizing micropower operation, integrated system monitoring, and ease of implementation in space-constrained layouts.
FAQ
What is the guaranteed output voltage tolerance of the LT1303CS8-5#PBF over temperature and line/load conditions?
The LT1303CS8-5#PBF guarantees a 5.0V output with ±4% total tolerance (4.8V to 5.2V) across the full 0°C to 70°C operating temperature range, 1.8V to 5.0V input voltage, and 1mA to 200mA load. This is specified as "Output Sense Voltage" in the Electrical Characteristics table and reflects combined effects of reference accuracy, resistor-divider matching (internal), and load/line regulation.
Can the LT1303CS8-5#PBF be used with a 1-cell Li-ion battery (2.7–4.2V input)?
Yes - the LT1303CS8-5#PBF accepts input voltages from 1.8V to 5.0V, fully covering the discharge curve of a single Li-ion cell. At 4.2V input, it operates in low-duty-cycle mode to maintain 5V output; at 2.7V, it delivers full 200mA with >85% efficiency. Its 1.8V minimum ensures compatibility with deeply discharged cells.
How does the low-battery detector in the LT1303CS8-5#PBF interface with a microcontroller?
The LT1303CS8-5#PBF's LBO pin is an open-collector output that pulls low (<0.4V at 100µA) when the LBI voltage drops below 1.24V. To interface with a 3.3V or 5V microcontroller GPIO, connect a pull-up resistor (e.g., 10kΩ to VCC) - the MCU reads a logic-low interrupt or polls the pin state to initiate graceful shutdown or battery-replacement alert.
What is the maximum recommended inductor value for the LT1303CS8-5#PBF in a 2-cell to 5V application?
The LT1303CS8-5#PBF supports inductors from 5µH to 50µH. For 2-cell (2.4V→1.8V) to 5V/200mA operation, 22µH is optimal - balancing peak current (≤1A), ripple (≤100mV), and physical size. Inductors exceeding 33µH increase off-time and may reduce transient response; values below 10µH raise RMS current and EMI risk. Sumida CD54-220 is a validated choice.
Does the LT1303CS8-5#PBF require an external Schottky diode, and what are acceptable part numbers?
Yes - the LT1303CS8-5#PBF requires an external Schottky diode connected between SW and VOUT. Recommended parts include 1N5817 (20V, 1A), MBRS120LT3 (20V, 1A), and MBR0520LT1 (20V, 0.5A). These provide low forward voltage (<0.45V) and fast recovery (<100ns); standard PN junction diodes (e.g., 1N4001) are unsuitable due to slow recovery and excessive conduction loss.
LT1303CS8-5#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:
- 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:
- Surface Mount
- Supplier Device Package:
- 8-SO
LT1303CS8-5#PBF FAQ
1.How can I place an order for LT1303CS8-5#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1303CS8-5#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 LT1303CS8-5#PBF reliable?
The price and inventory of LT1303CS8-5#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1303CS8-5#PBF is usually 5 days.
3.What payment methods are accepted for LT1303CS8-5#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1303CS8-5#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1303CS8-5#PBF?
LT1303CS8-5#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1303CS8-5#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 LT1303CS8-5#PBF?
For technical support, including LT1303CS8-5#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1303CS8-5#PBF requirements.
6.How does Aetrix verify that LT1303CS8-5#PBF is sourced from the original manufacturer or authorized distributors?
All LT1303CS8-5#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 LT1303CS8-5#PBF meets industry standards.
7.What is the process for return or replacement of LT1303CS8-5#PBF?
All LT1303CS8-5#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1303CS8-5#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 LT1303CS8-5#PBF part is unused and in its original packaging.
Return procedure for LT1303CS8-5#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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