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Analog Devices Inc. LT1303CS8-5#TRPBF
- Part No.:
- LT1303CS8-5#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1303CS8-5#TRPBF.pdf
- Description:
- IC REG BOOST 5V 750MA 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:4,121
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Product details
Overview
LT1303CS8-5#TRPBF 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. It operates from 1.8V to 5V input, delivers up to 200mA at 5V output, achieves 88% peak efficiency, draws only 120µA quiescent current, and features a 170mV typical VCE(SAT) at 700mA - ideal for space-constrained battery-powered instrumentation.
For engineers reviewing the LT1303CS8-5#TRPBF datasheet, LT1303CS8-5#TRPBF pinout, LT1303CS8-5#TRPBF application, or LT1303CS8-5#TRPBF equivalent, key selection criteria include its fixed 5V output regulation, 1.24V internal reference, open-collector LBO output with 1.24V trip threshold, SO-8 package compatibility, and Burst Mode™ operation enabling ultra-low standby power in portable systems.
Technical Context
The LT1303CS8-5#TRPBF uses a hysteretic current-mode architecture with Burst Mode™ operation to maintain regulation while minimizing quiescent current. Its on-chip NPN switch (170mV VCE(SAT) typ at 700mA) drives external inductors and Schottky diodes, while the internal 1.24V reference feeds a precision resistor string to fix output at 5.0V ±2%.
It integrates a dedicated low-battery comparator with LBI input (1.24V trip), LBO open-collector output (0.4V max @ 100µA), and shutdown control (SHDN pin). The device disables LBO and oscillator during shutdown, reducing supply current to 7µA typ - critical for long-life coin-cell or multi-cell battery applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0V ±2% - eliminates external feedback resistors; stable for USB-peripheral or logic-supply rail generation. |
| Input Voltage Range | 1.8V to 5V - supports 2-cell alkaline (2.4V–3.2V), 2-cell NiMH (2.0V–2.8V), or single Li-ion (3.0V–4.2V) without intermediate regulation. |
| Max Output Current | 200mA at 5V from 2V input - sufficient for microcontrollers, sensors, and RF modules in handheld devices. |
| Quiescent Current | 120µA typ - enables >1-year battery life in low-duty-cycle monitoring applications using CR2032 or AA cells. |
| Switch VCE(SAT) | 170mV typ at 700mA - minimizes conduction loss and thermal rise in compact SO-8 package (θJA = 150°C/W). |
| Oscillator Frequency | 155kHz typ - balances EMI suppression and inductor size; compatible with standard 10–33µH surface-mount ferrite inductors. |
| Low-Battery Threshold | LBI trip at 1.24V ±30mV - configurable via external divider to detect end-of-life in 2- or 3-cell systems (e.g., 2.2V cutoff). |
Pinout & Package
LT1303CS8-5#TRPBF is housed in an 8-lead plastic SOIC (S8) package, 3.9mm × 4.9mm footprint, with exposed pad not connected internally. Pin 1 is GND (signal ground), Pin 8 is PGND (power ground); both must be tied under the package for optimal thermal and noise performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 1) | Signal ground reference | Return path for FB/Sense, LBI, SHDN, and LBO; must connect to PGND under IC body to minimize ground bounce. |
| LBO (Pin 2) | Open-collector low-battery output | Sinks 100µA when VIN drops below LBI threshold; requires external pull-up for system-level battery alert signaling. |
| SHDN (Pin 3) | Active-low shutdown control | Pull to GND for normal operation; float or pull high (>1.8V) to reduce IQ to 7µA and disable LBO/oscillator. |
| SENSE (Pin 4) | Fixed 5V output sense input | Internally connected to 5V regulator feedback node; no external components required - distinguishes LT1303CS8-5#TRPBF from adjustable LT1303. |
| LBI (Pin 5) | Low-battery comparator input | Monitors scaled input voltage; trips LBO when voltage falls below 1.24V - used with resistor divider to set system-specific cutoff. |
| VIN (Pin 6) | Main power input | Accepts 1.8V–5V; requires ≥47µF low-ESR capacitor placed within 0.2" of pin to suppress switching noise and prevent instability. |
| SW (Pin 7) | Switch collector node | Drives external inductor/diode; layout must minimize trace length and loop area to reduce EMI and voltage spikes. |
| PGND (Pin 8) | Power ground return | Return path for SW current and input capacitor; tie directly to VIN bypass cap and connect to GND under package. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode™ operation | Reduces quiescent current to 120µA while maintaining regulation - extends battery life in intermittent-load applications like barcode scanners. |
| Integrated low-battery detector | Provides system-level battery monitoring with 1.24V LBI threshold and open-drain LBO output - eliminates need for external supervisor IC. |
| On-chip NPN power switch | 170mV VCE(SAT) at 700mA enables high efficiency without external MOSFET - simplifies BOM and reduces board area. |
| Fixed 5V output configuration | Eliminates external feedback resistors and associated layout sensitivity - improves production yield and long-term stability. |
| SO-8 package compatibility | Standard 8-pin SOIC footprint enables drop-in replacement in legacy designs and supports automated assembly with 0.050" pitch. |
Applications
| Portable Instruments | Bar-Code Scanners |
|---|---|
|
Use Scenario: Handheld multimeters and data loggers powered by two AA alkaline cells (2.0V–3.2V). IC Role / Device Role / Timing Role: Primary 5V rail generator with low-battery warning before cell depletion. Use Value: Delivers regulated 5V at 150mA with <120µA quiescent draw - enables >2-year shelf life and reliable measurement accuracy down to 2.2V input. |
Use Scenario: Battery-operated laser barcode readers requiring clean 5V for CMOS image sensor and decoder ASIC. IC Role / Device Role / Timing Role: Step-up converter with fast transient response and integrated LBO for battery-status LED indication. Use Value: 88% peak efficiency and 5µs shutdown response ensure consistent decode performance across battery discharge curve. |
| Palmtop Computers | Wireless Systems |
|
Use Scenario: Early PDAs with 2-cell NiMH batteries (2.0V–2.8V) powering 5V I/O peripherals and flash memory. IC Role / Device Role / Timing Role: Compact DC/DC solution with minimal external components (inductor, diode, caps) and no feedback network. Use Value: Fixed 5V output and SO-8 package reduce PCB area by 30% vs adjustable alternatives - critical for sub-100cm² form factors. |
Use Scenario: Bluetooth headsets and Zigbee sensor nodes using CR2032 coin cells (2.0V–3.0V) needing 5V for RF power amplifier bias. IC Role / Device Role / Timing Role: Micropower boost converter with shutdown control synchronized to radio transmit bursts. Use Value: 7µA shutdown current and 120µA operating IQ enable >6-month runtime in low-duty-cycle wireless telemetry applications. |
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 |
|---|---|---|---|
| LT1302CS8-5#TRPBF | Higher 600mA output current, 200µA quiescent current, same 5V fixed output and SO-8 package. | Supports higher load currents (e.g., LCD backlights, motor drivers) but consumes more idle power. | Select when >200mA continuous output is required and battery life is secondary to drive capability. |
| TPS61200DRCR | Adjustable output (0.9V–5.5V), 1.2MHz switching, 50µA quiescent current, 600mA switch, 6-pin WSON package. | Requires external feedback resistors; better suited for multi-rail systems needing programmable voltage or ultra-low IQ. | Select when design flexibility (adjustable VOUT) or lower quiescent current outweighs fixed-output simplicity and SO-8 compatibility. |
Compared with LT1303CS8-5#TRPBF, LT1302CS8-5#TRPBF trades higher output current for increased quiescent consumption, while TPS61200DRCR offers greater configurability and lower IQ but demands additional components and a different footprint - making LT1303CS8-5#TRPBF optimal for cost-sensitive, space-constrained 5V-only applications.
Availability
LT1303CS8-5#TRPBF is available at Aetrix Electronics and suitable for portable instruments, bar-code scanners, palmtop computers, and wireless systems requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for LT1303CS8-5#TRPBF 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, datasheet documentation, and reliability testing for legacy Linear parts including the LT1303 family.
The LT1303 series was designed specifically for ultra-low-power, small-footprint DC/DC conversion in battery-powered portable electronics - emphasizing micropower operation, integrated protection, and ease of implementation with minimal external components.
FAQ
What is the maximum input voltage rating for the LT1303CS8-5#TRPBF?
The LT1303CS8-5#TRPBF has an absolute maximum input voltage rating of 10V, but its specified operating input range is 1.8V to 5V. Exceeding 5V may cause unregulated output or damage due to internal circuit limitations - always limit VIN to ≤5V in normal operation per the Electrical Characteristics table.
Does the LT1303CS8-5#TRPBF require external feedback resistors to set the output voltage?
No, the LT1303CS8-5#TRPBF does not require external feedback resistors. It is the fixed 5V version of the LT1303 family, with internal resistor division connected to the SENSE pin (Pin 4) - unlike the adjustable LT1303, which uses FB (Pin 4) and external resistors.
How does the low-battery detector function on the LT1303CS8-5#TRPBF?
The LT1303CS8-5#TRPBF's low-battery detector compares voltage on LBI (Pin 5) to an internal 1.24V reference. When LBI falls below this threshold, LBO (Pin 2) pulls low (≤0.4V @ 100µA). LBO is disabled during shutdown - the detector remains active only when SHDN (Pin 3) is grounded.
Can the LT1303CS8-5#TRPBF drive a 5V load requiring 300mA continuously?
No, the LT1303CS8-5#TRPBF is rated for up to 200mA continuous output at 5V from a 2V input. Attempting 300mA will exceed its peak switch current limit (1.25A max) and cause thermal shutdown or regulation loss - use LT1302CS8-5#TRPBF or LT1305 for higher current needs.
What is the recommended inductor value for the LT1303CS8-5#TRPBF in a 2-cell to 5V application?
For 2-cell alkaline/NiMH inputs (2.0V–3.2V) delivering 200mA at 5V, a 22µH surface-mount inductor (e.g., Sumida CD54-220) is recommended. It must handle ≥1.25A saturation current, have low DCR (<0.2Ω), and avoid core saturation - verified in Figure 1 of the LT1303 datasheet.
LT1303CS8-5#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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#TRPBF FAQ
1.How can I place an order for LT1303CS8-5#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1303CS8-5#TRPBF 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#TRPBF reliable?
The price and inventory of LT1303CS8-5#TRPBF 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#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1303CS8-5#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1303CS8-5#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1303CS8-5#TRPBF?
LT1303CS8-5#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1303CS8-5#TRPBF 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#TRPBF?
For technical support, including LT1303CS8-5#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1303CS8-5#TRPBF requirements.
6.How does Aetrix verify that LT1303CS8-5#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1303CS8-5#TRPBF 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#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1303CS8-5#TRPBF?
All LT1303CS8-5#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1303CS8-5#TRPBF, 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#TRPBF part is unused and in its original packaging.
Return procedure for LT1303CS8-5#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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