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Analog Devices Inc. LT1300CS8#TRPBF
- Part No.:
- LT1300CS8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1300CS8#TRPBF.pdf
- Description:
- IC REG BUCK BOOST PROG 220MA 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:4,193
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Product details
Overview
LT1300CS8#TRPBF from Analog Devices (formerly Linear Technology) is a micropower step-up DC/DC converter with Burst Mode™ operation, delivering up to 220mA at 5V from a 2V input. It features programmable 3.3V/5V output selection via the SELECT pin, 170mV typical switch saturation voltage at 1A, and 120µA no-load quiescent current. Used in battery-powered portable instruments and PCMCIA cards where low-voltage start-up and high efficiency are critical.
For engineers reviewing the LT1300CS8#TRPBF datasheet, LT1300CS8#TRPBF pinout, LT1300CS8#TRPBF application, or LT1300CS8#TRPBF equivalent, key selection criteria include input voltage range (1.8–6V), ILIM-programmable peak switch current (400mA–1.25A), 155kHz fixed-frequency oscillator, SOIC-8 package thermal resistance (θJA = 150°C/W), and guaranteed operation down to 1.8V for extended battery life.
Technical Context
The LT1300CS8#TRPBF integrates a bipolar power switch with 170mV VCE(SAT) at 1A and uses a 155kHz internal oscillator to enable compact 10µH surface-mount inductors. Its Burst Mode™ operation maintains regulation at light loads by pulsing the switch only when needed, reducing no-load current to 120µA.
Output voltage is selected between 3.3V (SELECT = GND) and 5V (SELECT = VIN or VOUT) via an internal resistor divider referenced to a 1.25V bandgap. The ILIM pin sets peak switch current using external resistors or grounding, enabling optimization of inductor size and efficiency across load ranges.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 1.8V to 6V - enables full operation from two alkaline cells down to end-of-life voltage. |
| Output Voltage Options | Programmable 3.3V (±3.5%) or 5V (±4%) - selected by logic level on SELECT pin, no external feedback resistors required. |
| Max Output Current | 220mA at 5V from 2V input - supports moderate-power peripherals in portable systems. |
| Quiescent Current | 120µA typical at no load - minimizes battery drain during standby in always-on devices. |
| Switch Saturation Voltage | 170mV typical at 1A - reduces conduction loss and improves efficiency over prior-generation converters. |
| Oscillator Frequency | 155kHz nominal - allows use of small, low-cost 10µH surface-mount inductors without audible noise. |
| Shutdown Current | 10µA - enables deep sleep mode for ultra-low-power system states. |
Pinout & Package
LT1300CS8#TRPBF is housed in an 8-lead plastic SOIC package (S8), 3.9mm × 4.9mm body, 1.27mm pitch, with θJA = 150°C/W. Pin 1 is GND (signal ground); Pin 8 is PGND (power ground), requiring direct connection under the package for optimal thermal and EMI performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 1) | Signal Ground Reference | Return path for internal bias circuitry and comparator reference; must be tied to PGND under IC body. |
| SEL (Pin 2) | Output Voltage Select Input | Logic-controlled selection: grounded → 3.3V output; connected to VIN/VOUT → 5V output. |
| SHDN (Pin 3) | Active-High Shutdown Control | Pull ≥1.8V to disable switching and reduce supply current to 10µA; tie to GND for normal operation. |
| SENSE (Pin 4) | Output Voltage Feedback Node | Connects directly to regulated output; internal 1.25V reference compares against divided output voltage. |
| ILIM (Pin 5) | Peak Switch Current Programming | Float → 1A limit; ground → ~400mA limit; resistor-to-ground sets intermediate trip point (e.g., 500kΩ → ~750mA). |
| VIN (Pin 6) | Main Power Input | Accepts 1.8–6V; requires local 0.1µF ceramic + bulk electrolytic bypassing close to pin. |
| SW (Pin 7) | Internal Switch Collector Node | Drives external inductor/diode; layout must minimize trace length to reduce EMI and switching losses. |
| PGND (Pin 8) | Power Ground Return | Low-impedance return for switch current; must be tied to GND (Pin 1) under package and connect to input capacitor negative. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode™ Operation | Maintains regulation at light loads with pulsed switching, achieving 120µA quiescent current and extending battery runtime. |
| ILIM-Programmable Peak Current | Enables scalable inductor selection: 400mA (grounded) to 1.25A (floating), reducing BOM cost and board area for lighter loads. |
| Low-Voltage Start-Up | Guaranteed operation from 1.8V input - extracts maximum energy from aging alkaline or NiMH cells. |
| Integrated Bipolar Switch | 170mV VCE(SAT) at 1A eliminates need for external MOSFET driver and reduces conduction loss vs. discrete solutions. |
| Fixed 155kHz Oscillator | Eliminates external timing components and ensures predictable EMI profile compatible with FCC Class B limits. |
Applications
| Bar-Code Scanners | PCMCIA Cards |
|---|---|
Use Scenario: Portable handheld scanners powered by two AA batteries require stable 5V rail for laser diode and decoder ICs during intermittent scanning bursts. IC Role / Device Role / Timing Role: LT1300CS8#TRPBF acts as primary step-up regulator, converting decaying 2.0–3.0V battery voltage to regulated 5V with Burst Mode™ maintaining efficiency at standby. Use Value: 88% peak efficiency at 2V input and 220mA load extends battery life per charge; 10µA shutdown current enables instant-on wake from deep sleep. | Use Scenario: PCMCIA Type II card with integrated modem or flash memory needs isolated 3.3V/5V rails from host's 3.3V or battery supply. IC Role / Device Role / Timing Role: LT1300CS8#TRPBF provides programmable 3.3V or 5V output via SEL pin, supporting dual-voltage peripheral interfaces without external regulators. Use Value: 1.8V minimum input allows operation even when host battery drops below 2.0V; SOIC-8 footprint fits tight PCMCIA board constraints. |
| Portable Instruments | Battery Backup Supplies |
Use Scenario: Handheld multimeter or data logger operates from two AAA cells and requires clean 5V for ADC, display, and microcontroller. IC Role / Device Role / Timing Role: LT1300CS8#TRPBF delivers regulated 5V output while maintaining <120µA quiescent draw during measurement idle periods. Use Value: Low VCE(SAT) and Burst Mode™ ensure >80% efficiency across 1.8–3.2V input range, doubling usable battery capacity vs. linear regulators. | Use Scenario: Real-time clock (RTC) backup circuit in industrial controller must sustain 3.3V rail during main power failure using coin cell. IC Role / Device Role / Timing Role: LT1300CS8#TRPBF configured for 3.3V output powers RTC and SRAM from 1.8–2.5V lithium coin cell with minimal self-discharge. Use Value: 10µA shutdown current and 1.8V start-up allow >10-year coin cell life; ILIM grounding restricts peak current to preserve cell longevity. |
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 |
|---|---|---|---|
| LTC3525EDC-5#TRMPBF | Higher 400mA output, 2MHz switching, integrated Schottky, but requires 2.5V min input. | Better suited for space-constrained designs needing higher current and smaller magnetics; not viable for sub-2.5V battery start-up. | Select LTC3525EDC-5#TRMPBF only if input stays ≥2.5V and 400mA output is required; LT1300CS8#TRPBF remains superior for true 1.8V start-up. |
| TPS61200DRCR | 1.8V min input, 1.2A switch, but fixed 3.3V output and no SELECT pin for dual-voltage flexibility. | Ideal for dedicated 3.3V systems; lacks LT1300CS8#TRPBF's logic-selectable 3.3V/5V output and lower quiescent current (120µA vs. 150µA). | Choose TPS61200DRCR for cost-sensitive 3.3V-only applications; retain LT1300CS8#TRPBF when dual-output programmability and lowest IQ are mandatory. |
Compared with LTC3525EDC-5#TRMPBF and TPS61200DRCR, the LT1300CS8#TRPBF uniquely combines 1.8V start-up, selectable 3.3V/5V output, 120µA quiescent current, and SOIC-8 compatibility - making it irreplaceable in legacy portable designs requiring wide input range and dual-rail flexibility without layout changes.
Availability
LT1300CS8#TRPBF is available at Aetrix Electronics and suitable for portable instrumentation, battery-powered bar-code scanners, and PCMCIA card power management requiring stable component supply across long-lifecycle embedded programs.
Supply support for LT1300CS8#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 supply chain support for its legacy power management portfolio.
The LT1300CS8#TRPBF belongs to Linear's micropower DC/DC converter family, designed specifically for battery-operated portable equipment demanding ultra-low quiescent current, wide input voltage range, and minimal external component count.
FAQ
What is the minimum input voltage required for LT1300CS8#TRPBF to start switching?
The LT1300CS8#TRPBF guarantees operation down to 1.8V input, enabling full functionality from two nearly depleted alkaline cells. Startup occurs reliably at this voltage with typical 120µA quiescent current; operation below 1.8V is not specified and may result in unstable regulation or failure to initiate switching. This 1.8V threshold is confirmed in the Absolute Maximum Ratings and Electrical Characteristics tables of the official LT1300 datasheet.
How does the ILIM pin affect output current capability in LT1300CS8#TRPBF?
The ILIM pin on the LT1300CS8#TRPBF directly programs the peak switch current limit: floating yields ~1.0A, grounding reduces it to ~400mA, and a resistor to ground sets intermediate values (e.g., 500kΩ → ~750mA). This adjustment scales inductor and capacitor requirements - lower ILIM allows smaller, cheaper magnetics but reduces maximum deliverable output current proportionally. The relationship is linear and documented in Figure 6 of the LT1300 datasheet.
Can LT1300CS8#TRPBF generate both 3.3V and 5V outputs on the same PCB?
Yes - the LT1300CS8#TRPBF supports logic-selectable outputs: tie the SEL pin (Pin 2) to GND for 3.3V regulation or to VIN/VOUT for 5V regulation. No external resistors or component changes are needed. This dual-voltage capability is intrinsic to the LT1300CS8#TRPBF's internal feedback divider architecture and is validated across temperature and load in the Electrical Characteristics table (VOUT specs for both VSEL = 0V and VSEL = 5V).
What is the thermal performance of LT1300CS8#TRPBF in SOIC-8 package?
The LT1300CS8#TRPBF in SOIC-8 (S8) package has a junction-to-ambient thermal resistance (θJA) of 150°C/W, measured on a standard 2-layer JEDEC test board. With 500mW maximum power dissipation and 70°C max ambient, junction temperature rise is limited to 75°C - well within the 100°C TJMAX rating. Proper layout - including tying PGND and GND under the package and using thermal vias - is essential to maintain this rating in real-world applications.
Does LT1300CS8#TRPBF require an external Schottky diode, and what are acceptable part numbers?
Yes - the LT1300CS8#TRPBF requires an external Schottky rectifier diode connected between SW (Pin 7) and output. Recommended parts include MBRS130LT3 (Motorola) and 1N5817 (onsemi), both validated in Linear's typical applications (TA1, TA5). These diodes provide low forward voltage (<0.45V) and fast recovery, minimizing conduction loss and ripple. Standard silicon diodes like 1N4148 are usable but degrade efficiency significantly due to higher VF and reverse recovery.
LT1300CS8#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, Step-Up/Step-Down
- Output Configuration:
- Positive
- Topology:
- Boost, Buck-Boost
- Output Type:
- Programmable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 1.8V
- Voltage - Input (Max):
- 10V
- Voltage - Output (Min/Fixed):
- 3.3V, 5V
- Voltage - Output (Max):
- -
- Current - Output:
- 220mA
- Frequency - Switching:
- 155kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LT1300CS8#TRPBF FAQ
1.How can I place an order for LT1300CS8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1300CS8#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 LT1300CS8#TRPBF reliable?
The price and inventory of LT1300CS8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1300CS8#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1300CS8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1300CS8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1300CS8#TRPBF?
LT1300CS8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1300CS8#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 LT1300CS8#TRPBF?
For technical support, including LT1300CS8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1300CS8#TRPBF requirements.
6.How does Aetrix verify that LT1300CS8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1300CS8#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 LT1300CS8#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1300CS8#TRPBF?
All LT1300CS8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1300CS8#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 LT1300CS8#TRPBF part is unused and in its original packaging.
Return procedure for LT1300CS8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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