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Analog Devices Inc. LT1303IS8#TRPBF
- Part No.:
- LT1303IS8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1303IS8#TRPBF.pdf
- Description:
- IC REG BOOST ADJ 750MA 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:4,365
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Product details
Overview
LT1303IS8#TRPBF from Analog Devices (formerly Linear Technology) is a micropower step-up DC/DC converter with integrated low-battery detector and fixed 5V output. It operates from 1.8V to 5V input, delivers up to 200mA at 5V, achieves 88% efficiency at 2V input, and draws only 120µA quiescent current - ideal for 2-cell alkaline or Li-ion portable systems requiring regulated 5V rail.
For engineers reviewing the LT1303IS8#TRPBF datasheet, LT1303IS8#TRPBF pinout, LT1303IS8#TRPBF application, or LT1303IS8#TRPBF equivalent, key selection criteria include its 5V fixed output configuration, 170mV NPN switch saturation voltage at 700mA, 1.24V internal reference, open-collector LBO output, and SO-8 package compatibility with space-constrained battery-powered designs.
Technical Context
The LT1303IS8#TRPBF implements Burst Mode™ operation to maintain high efficiency at light loads, using an internal 1.24V bandgap reference and hysteresis-controlled comparator for feedback regulation. Its on-chip NPN power switch features low VCE(SAT) (130–200mV at 700mA), enabling high conversion efficiency across 1.8–5V input range.
Burst Mode™ control reduces quiescent current to 120µA during regulation and further to 10µA in shutdown. The low-battery detector compares VIN against an internal 1.24V threshold via the LBI pin, asserting open-drain LBO below 1.21–1.27V with 22–50mV hysteresis - independent of shutdown state but disabled when SHDN is high.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0V ±2%, set by internal resistor divider - eliminates external feedback components for simplified 5V boost design. |
| Input Voltage Range | 1.8V to 5.0V - supports single Li-ion, 2-cell alkaline/NiMH, or 3-cell NiCd battery inputs without external regulation. |
| Max Output Current | 200mA at 5V from 2V input - sufficient for microcontrollers, sensors, and RF modules in portable instrumentation. |
| Efficiency | Up to 88% at 200mA load and 2V input - minimizes battery drain and thermal rise in compact enclosures. |
| Quiescent Current | 120µA typical in active regulation - extends battery life in always-on monitoring applications. |
| Switch Saturation Voltage | 130–200mV at 700mA - reduces conduction loss and improves light-load efficiency vs. MOSFET-based alternatives. |
| Oscillator Frequency | 120–185kHz - enables use of small, low-cost surface-mount inductors (e.g., 22µH Sumida CD54 series). |
Pinout & Package
LT1303IS8#TRPBF is housed in an 8-lead plastic SOIC (SO-8) package with standard 1.27mm pitch, JEDEC MS-012AC compliant, and rated for 0°C to 70°C operation. Thermal resistance θJA = 150°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 1) | Signal Ground Reference | Low-impedance return path for FB, LBI, and internal comparators - must be tied to PGND under package for stable regulation. |
| LBO (Pin 2) | Low-Battery Open-Drain Output | Asserts low when LBI < 1.24V (±30mV hysteresis); sinks 100µA max - requires external pull-up for system-level battery alert signaling. |
| SHDN (Pin 3) | Shutdown Control Input | Pull to ≥1.8V to disable switching and reduce IQ to 10µA; ground for normal operation - enables host-controlled power gating. |
| SENSE (Pin 4) | Output Voltage Sense Input | Connects to internal 5V divider - no external resistors needed; monitors VOUT for closed-loop regulation and overvoltage protection. |
| LBI (Pin 5) | Low-Battery Comparator Input | Monitors scaled input voltage (e.g., via resistor divider from VIN); trip point 1.21–1.27V - enables customizable battery depletion thresholds. |
| VIN (Pin 6) | Main Power Input | Accepts 1.8–5V unregulated supply; requires local 47–100µF electrolytic bypass to PGND within 5mm for stability. |
| SW (Pin 7) | Internal NPN Switch Collector | Drives external inductor/diode; peak current capability 0.75–1.25A - layout must minimize trace inductance to suppress EMI. |
| PGND (Pin 8) | Power Ground Return | High-current return for SW node and input capacitor - tie directly to VIN bypass capacitor and GND under package to avoid ground bounce. |
Key Features
| Feature | Design Value |
|---|---|
| Micropower Burst Mode™ Operation | Reduces IQ to 120µA while maintaining regulation - extends shelf life and runtime in intermittent-use devices like barcode scanners. |
| Integrated Low-Battery Detector | Provides accurate, hysteresis-stabilized LBO signal without external comparators - simplifies BOM and PCB area for battery-powered instruments. |
| Fixed 5V Output Configuration | Eliminates external feedback resistors and associated layout sensitivity - accelerates design cycle for 5V logic/radio subsystems. |
| Low-VCE(SAT) NPN Switch | 130–200mV drop at 700mA - improves efficiency over MOSFET-based converters at sub-1A loads and avoids gate-drive complexity. |
| SO-8 Package Compatibility | Standard footprint enables drop-in replacement for legacy SO-8 DC/DC solutions - supports automated assembly and rework with common tooling. |
Applications
| EL Panel Drivers | 2-Cell to 5V Conversion |
|---|---|
Use Scenario: Driving electroluminescent (EL) panels in handheld medical testers and industrial HMI displays powered by two AA batteries. IC Role / Device Role / Timing Role: Generates high-voltage AC (83–115VRMS) from 1.5–8V DC input using external transformer; provides regulated 5V bias for driver ICs. Use Value: Enables compact, low-noise EL backlighting with <100mV output ripple and burst-mode efficiency >80% at 10mA load. | Use Scenario: Powering 5V microcontroller peripherals (USB-UART, sensors, display) in palmtop computers and PDAs running on two alkaline cells (2.0–3.2V). IC Role / Device Role / Timing Role: Primary 5V step-up regulator with integrated low-battery warning - replaces discrete boost + comparator solutions. Use Value: Delivers stable 5V at 200mA from 2V input with 88% efficiency, extending battery life by >30% vs. linear regulators. |
| Portable Instruments | Wireless Systems |
Use Scenario: Supplying 5V to precision ADCs, op-amps, and wireless transceivers in handheld multimeters and environmental data loggers. IC Role / Device Role / Timing Role: Regulated 5V source with ultra-low quiescent current and clean output - critical for battery-operated measurement accuracy. Use Value: 120µA IQ and <50mV ripple enable >1-year battery life in sleep mode while maintaining fast wake-up response. | Use Scenario: Powering BLE/Wi-Fi modules in asset trackers and smart sensors operating on coin-cell or 2-cell primary batteries. IC Role / Device Role / Timing Role: Efficient 5V rail generator with programmable shutdown and battery monitoring - synchronizes power delivery with radio transmit bursts. Use Value: SHDN pin allows host MCU to disable LT1303IS8#TRPBF between transmissions, reducing average system current to <1µA in deep sleep. |
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 |
|---|---|---|---|
| LT1303CS8 | Same die, commercial-grade (0°C to 70°C) SO-8 variant without I-grade screening or tape-and-reel packaging. | No difference in circuit function or performance; identical pinout and electrical specs. | Select LT1303CS8 for cost-sensitive non-industrial designs where extended temperature or AEC-Q200 compliance is not required. |
| LT1305CS8 | Higher output current (400mA), same 1.8–5V input, but uses P-channel MOSFET switch and different control architecture. | Supports higher-power loads (e.g., GSM modems) but lacks integrated low-battery detector and fixed 5V option. | Choose LT1305CS8 only when >200mA output is mandatory; otherwise LT1303IS8#TRPBF offers better integration and lower BOM count for 5V/200mA use cases. |
Compared with LT1303CS8, LT1303IS8#TRPBF adds industrial temperature qualification and tape-and-reel packaging for automated manufacturing, while LT1305CS8 trades low-battery detection and fixed 5V simplicity for higher current capability - making LT1303IS8#TRPBF optimal for space- and cost-constrained 200mA portable systems requiring battery health monitoring.
Availability
LT1303IS8#TRPBF is available at Aetrix Electronics and suitable for portable instruments, wireless sensor nodes, and EL panel drivers requiring stable component supply with guaranteed long-term availability and full traceability.
Supply support for LT1303IS8#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 its portfolio of high-performance analog and power management ICs with emphasis on reliability and precision.
The LT1303 family was designed specifically for micropower, battery-operated DC/DC conversion in space-constrained portable equipment - prioritizing ultra-low quiescent current, integrated protection, and minimal external component count.
FAQ
What is the maximum input voltage rating for the LT1303IS8#TRPBF?
The absolute maximum input voltage for LT1303IS8#TRPBF is 10V, but its specified operating input range is 1.8V to 5.0V. Exceeding 5V may cause improper regulation or damage due to internal clamp structures. For 5–10V inputs, external pre-regulation or a different converter such as LT1302 is recommended. Always refer to the Absolute Maximum Ratings table in the official LT1303 datasheet for safe operation limits of LT1303IS8#TRPBF.
Does the LT1303IS8#TRPBF require external feedback resistors to set the output voltage?
No, the LT1303IS8#TRPBF is the fixed 5V version (LT1303-5) and contains an internal resistor divider that sets the SENSE pin reference to 5.0V ±2%. Unlike the adjustable LT1303, it does not require external FB resistors - simplifying layout and improving accuracy by eliminating resistor tolerance and thermal drift effects. This makes LT1303IS8#TRPBF ideal for applications needing a precise, low-component-count 5V boost solution.
How does the low-battery detector in the LT1303IS8#TRPBF operate, and what is its trip threshold?
The LT1303IS8#TRPBF low-battery detector compares voltage on the LBI pin to an internal 1.24V reference. When LBI falls below 1.21–1.27V (typical 1.24V), the open-drain LBO pin pulls low. Hysteresis is 22–50mV to prevent chatter near the threshold. LBO is disabled during shutdown (SHDN high). To monitor VIN directly, a resistor divider scaling VIN to ~1.24V at LBI is used - enabling customizable battery depletion alerts without external comparators in LT1303IS8#TRPBF designs.
Can the LT1303IS8#TRPBF drive a 5V load requiring more than 200mA?
No - the LT1303IS8#TRPBF is rated for up to 200mA output at 5V from a 2V input, with peak switch current limited to 0.75–1.25A depending on input voltage. Attempting >200mA continuous load risks thermal shutdown or regulation failure. For higher current, Analog Devices recommends the LT1302 (600mA) or LT1305 (400mA), which share similar input ranges and features but differ in switch architecture and protection schemes. Always verify load requirements against the LT1303IS8#TRPBF Electrical Characteristics table before final design.
What type of inductor is recommended for use with the LT1303IS8#TRPBF?
The LT1303IS8#TRPBF works best with 10–33µH surface-mount ferrite inductors rated for ≥1.25A saturation current and low DC resistance - such as Sumida CD54-220 (22µH), Coilcraft D03316, or Gowanda GA10 series. Inductor selection must ensure di/dt < 400mA/µs and avoid saturation below 1A. The datasheet confirms Sumida CD54-220MC as validated for LT1303IS8#TRPBF in Figure 1 and Table 1, delivering stable 200mA output with <100mV ripple at 5V.
LT1303IS8#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:
- 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
LT1303IS8#TRPBF FAQ
1.How can I place an order for LT1303IS8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1303IS8#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 LT1303IS8#TRPBF reliable?
The price and inventory of LT1303IS8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1303IS8#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1303IS8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1303IS8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1303IS8#TRPBF?
LT1303IS8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1303IS8#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 LT1303IS8#TRPBF?
For technical support, including LT1303IS8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1303IS8#TRPBF requirements.
6.How does Aetrix verify that LT1303IS8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1303IS8#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 LT1303IS8#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1303IS8#TRPBF?
All LT1303IS8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1303IS8#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 LT1303IS8#TRPBF part is unused and in its original packaging.
Return procedure for LT1303IS8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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