My Inquiry
My Account
Analog Devices Inc. LT1303CS8#TRPBF
- Part No.:
- LT1303CS8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1303CS8#TRPBF.pdf
- Description:
- IC REG BOOST ADJ 750MA 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:4,465
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LT1303CS8#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% peak efficiency, and draws only 120µA quiescent current - ideal for 2-cell alkaline or Li-ion–powered portable instrumentation and barcode scanners.
For engineers reviewing the LT1303CS8#TRPBF datasheet, LT1303CS8#TRPBF pinout, LT1303CS8#TRPBF application, or LT1303CS8#TRPBF equivalent, key selection criteria include its 5V fixed output regulation, 170mV NPN switch saturation voltage at 700mA, Burst Mode™ operation for ultra-low standby power, and SO-8 package compatibility with space-constrained battery-powered designs.
Technical Context
The LT1303CS8#TRPBF implements a current-mode PWM controller with an on-chip NPN power switch and internal 1.24V reference. Its Burst Mode™ operation disables switching when load demand falls below threshold, reducing quiescent current to 120µA and enabling multi-week battery life in intermittent-use devices.
It integrates a dedicated low-battery comparator with LBI input (trip point 1.24V ±30mV) and open-collector LBO output, plus shutdown control (SHDN) that reduces total supply current to 7µA. The fixed 5V version uses internal resistor divider feedback, eliminating external resistors required by the adjustable LT1303 variant.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0V ±2% (guaranteed over temperature and line/load) |
| Input Voltage Range | 1.8V to 5.0V (supports 2-cell alkaline, NiMH, or single Li-ion) |
| Max Output Current | 200mA at VIN ≥ 2V (limited by internal 1A peak switch current and thermal design) |
| Quiescent Current | 120µA typical (enables >1-year shelf life in low-duty-cycle instruments) |
| Switch Saturation Voltage | 170mV typ at 700mA (minimizes conduction loss in high-efficiency boost topology) |
| Oscillator Frequency | 155kHz typical (enables use of small, low-cost 22µH surface-mount inductors) |
| Low-Battery Threshold | 1.24V on LBI pin (corresponds to ~2.2V battery voltage with 100k/412k divider per Figure 1) |
Pinout & Package
LT1303CS8#TRPBF is housed in an 8-lead plastic SOIC (SO-8) package, 3.9mm × 4.9mm body, 1.27mm lead pitch, RoHS-compliant and halogen-free.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 1) | Signal ground reference | Must be tied to PGND under package; forms reference for FB, LBI, and SHDN logic |
| LBO (Pin 2) | Open-collector low-battery output | Sinks 100µA when VIN drops below threshold; disabled during shutdown |
| SHDN (Pin 3) | Active-low shutdown control | Pull to GND for normal operation; pull ≥1.8V to reduce IQ to 7µA |
| SENSE (Pin 4) | 5V output feedback node | Internally connected to 4.8–5.2V precision divider; no external resistors needed |
| LBI (Pin 5) | Low-battery comparator input | Monitors scaled battery voltage; trips at 1.24V ±30mV hysteresis |
| VIN (Pin 6) | Main power input | Accepts 1.8–5V; requires local 47–100µF electrolytic bypass to PGND within 0.2" |
| SW (Pin 7) | Internal NPN switch collector | Drives external inductor/diode; layout must minimize loop area to suppress EMI |
| PGND (Pin 8) | Power ground return | Separate from signal GND but tied under package; carries high di/dt switch current |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode™ operation | Reduces IQ to 120µA while maintaining regulation - extends battery life in sleep-mode applications |
| Integrated low-battery detector | Provides system-level battery monitoring without external comparators or voltage references |
| On-chip 1A NPN switch | Eliminates external transistor; 170mV VCE(SAT) minimizes dropout and improves efficiency at light loads |
| Fixed 5V output configuration | Removes need for external feedback resistors - simplifies BOM and layout for standard 5V rail generation |
| SO-8 package compatibility | Enables drop-in replacement for legacy 8-pin boost converters and supports automated assembly |
Applications
| EL Panel Driver | 2-Cell to 5V Portable Power |
|---|---|
|
Use Scenario: Driving electroluminescent (EL) panels in handheld test equipment with 1.5–3.6V battery input. IC Role / Device Role / Timing Role: Step-up converter generating stable 5V rail to power EL driver ICs and bias circuitry. Use Value: Delivers regulated 5V from diminishing 2-cell input while maintaining panel brightness via Burst Mode™ efficiency down to 1.8V. |
Use Scenario: Providing 5V power for microcontroller, display, and sensor subsystems in barcode scanners powered by two AA cells. IC Role / Device Role / Timing Role: Primary DC/DC regulator with integrated low-battery alert to trigger UI warnings before system brownout. Use Value: 200mA output capability and 120µA quiescent current enable >6-month battery life in intermittent-scan usage profiles. |
| Palmtop Computer Power | Wireless Sensor Node Supply |
|
Use Scenario: Generating clean 5V for USB peripherals and flash memory in legacy palmtop PCs using 2×AA or 2×AAA batteries. IC Role / Device Role / Timing Role: High-efficiency boost converter with shutdown control synchronized to host processor sleep states. Use Value: 88% peak efficiency and 7µA shutdown current preserve battery capacity during extended suspend periods. |
Use Scenario: Powering sub-GHz RF transceivers and analog front-ends in battery-operated environmental sensors. IC Role / Device Role / Timing Role: Primary voltage regulator with LBO output interfaced to MCU GPIO for predictive battery management. Use Value: Precise 1.24V LBI threshold enables accurate state-of-charge estimation across temperature without calibration. |
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 | Higher 600mA output, 200µA IQ, same SO-8 package and pinout | Required where load exceeds 200mA (e.g., motor-driven peripherals) | Choose LT1302CS8#PBF if higher output current is needed; shares identical footprint and control interface |
| TPS61200DRCR | 1.8–5.5V input, 5V/500mA output, 50µA IQ, 1.2MHz switching | Supports wider input range and lower quiescent current but requires external feedback resistors | Choose TPS61200DRCR for ultra-low-power designs needing <100µA IQ and higher frequency operation |
Compared with LT1303CS8#TRPBF, LT1302CS8#PBF offers 3× higher output current in identical packaging, while TPS61200DRCR provides lower IQ and higher switching frequency at the cost of added external components and different pin function mapping.
Availability
LT1303CS8#TRPBF is available at Aetrix Electronics and suitable for portable instrumentation, barcode scanners, and EL panel drivers requiring stable component supply with long-term lifecycle support.
Supply support for LT1303CS8#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 technical and manufacturing continuity for all Linear DC/DC converter products.
The LT1303 family was designed specifically for ultra-low-power, space-constrained battery-operated systems requiring reliable 5V generation from single- or dual-cell sources.
FAQ
What is the maximum input voltage rating for the LT1303CS8#TRPBF?
The LT1303CS8#TRPBF has an absolute maximum input voltage rating of 10V, but its specified operating input range is 1.8V to 5.0V. Exceeding 5V may cause regulation instability or premature shutdown due to internal protection thresholds. For inputs above 5V, consider the LT1305 or discrete solutions with external pass elements.
Does the LT1303CS8#TRPBF require external feedback resistors to set the 5V output?
No - the LT1303CS8#TRPBF is the fixed 5V version (denoted by "-5" suffix in the LT1303-5 family). Its SENSE pin connects internally to a precision resistor divider calibrated for 4.8V to 5.2V output tolerance. External resistors are unnecessary and would disrupt regulation.
How does the low-battery detector in the LT1303CS8#TRPBF operate?
The LT1303CS8#TRPBF's low-battery detector compares voltage on the LBI pin to an internal 1.24V reference. When LBI falls below this threshold (e.g., via resistor divider from VIN), the open-collector LBO pin pulls low. LBO is disabled during shutdown mode and sinks up to 100µA.
Can the LT1303CS8#TRPBF drive a 5V load requiring more than 200mA?
The LT1303CS8#TRPBF is rated for up to 200mA continuous output at VIN ≥ 2V. Attempting higher loads causes thermal foldback or output droop due to internal 1A peak switch current limit and SO-8 package thermal resistance (θJA = 150°C/W). For >200mA, select LT1302CS8#PBF or LT1305.
What is the purpose of the PGND pin on the LT1303CS8#TRPBF, and how should it be connected?
The PGND pin on the LT1303CS8#TRPBF serves as the high-current return path for the internal NPN switch and external inductor. It must be tied directly to signal GND (Pin 1) under the package footprint and connected to the VIN bypass capacitor's ground terminal within 0.2 inches to minimize switching noise and ensure stable regulation.
LT1303CS8#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
LT1303CS8#TRPBF FAQ
1.How can I place an order for LT1303CS8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1303CS8#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#TRPBF reliable?
The price and inventory of LT1303CS8#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#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1303CS8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1303CS8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1303CS8#TRPBF?
LT1303CS8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1303CS8#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#TRPBF?
For technical support, including LT1303CS8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1303CS8#TRPBF requirements.
6.How does Aetrix verify that LT1303CS8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1303CS8#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#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1303CS8#TRPBF?
All LT1303CS8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1303CS8#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#TRPBF part is unused and in its original packaging.
Return procedure for LT1303CS8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT1303CS8#TRPBF Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
