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Analog Devices Inc. LT1300CS8#PBF
- Part No.:
- LT1300CS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1300CS8#PBF.pdf
- Description:
- IC REG BUCK BOOST PROG 220MA 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:297
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Product details
Overview
LT1300CS8#PBF from Analog Devices (formerly Linear Technology) is a micropower step-up DC/DC converter with Burst Mode™ operation, designed to generate regulated 3.3V or 5V outputs from input voltages as low as 1.8V. It delivers up to 220mA at 5V from a 2V supply, achieves up to 88% efficiency, features a 170mV typical switch saturation voltage at 1A, and supports programmable peak switch current via the ILIM pin. It targets battery-powered portable instrumentation and PDA power rails.
For engineers reviewing the LT1300CS8#PBF datasheet, LT1300CS8#PBF pinout, LT1300CS8#PBF application, or LT1300CS8#PBF equivalent, key selection criteria include its 1.8V minimum input, 120µA no-load quiescent current, 8-lead SOIC package, programmable output select logic, and ILIM-based peak current scaling for inductor optimization in space-constrained designs.
Technical Context
The LT1300CS8#PBF integrates a bipolar power switch with 170mV VCE(SAT) at 1A and uses a 155kHz internal oscillator to enable compact external components. Its Burst Mode™ operation maintains high efficiency across light loads by disabling switching until output voltage droop triggers regulation recovery.
Output voltage is selected between 3.3V (SEL = GND) and 5V (SEL = VIN/VOUT) via a dedicated logic pin; the SENSE pin provides feedback for output regulation. The ILIM pin allows precise setting of peak switch current from ~400mA (ILIM grounded) to 1.25A (ILIM floating), enabling trade-offs between output current capability and component size/cost.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 1.8V to 6V - enables full operation down to near-dead alkaline battery voltage, extending usable battery life. |
| Output Voltage Options | Programmable 3.3V (±3.5%) or 5V (±4%) - selected by logic level on SEL pin, supporting dual-rail system design without external resistors. |
| Quiescent Current | 120µA (no load) - minimizes standby drain in always-on portable devices such as barcode scanners and PDAs. |
| Shutdown Current | 10µA - reduces system-level leakage when host controller asserts SHDN high, critical for long-term battery backup supplies. |
| Switch Saturation Voltage | 170mV typical at 700mA - lowers conduction loss in the integrated NPN switch, improving efficiency especially at medium loads. |
| Oscillator Frequency | 155kHz typical - permits use of small 10µH surface-mount inductors (e.g., Coilcraft DO1608-103) without compromising EMI or transient response. |
| Peak Switch Current Limit | Programmable 0.4A to 1.25A via ILIM resistor - allows inductor and capacitor downsizing for lighter load applications while maintaining stability. |
Pinout & Package
LT1300CS8#PBF is housed in an 8-lead plastic SOIC (S8) package, 3.9mm × 4.9mm × 1.5mm, with standard 1.27mm pitch and RoHS-compliant matte tin lead finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 1) | Signal Ground Reference | Low-impedance return path for feedback and bias circuitry; must be tied to PGND under the IC body to minimize noise coupling. |
| SEL (Pin 2) | Output Voltage Select Input | Logic-controlled pin: grounded → 3.3V output; connected to VIN or VOUT → 5V output; supports dynamic rail switching in multi-voltage systems. |
| SHDN (Pin 3) | Active-High Shutdown Control | Pulling ≥1.8V disables switching and reduces total supply current to 10µA; must not float to prevent erratic enable/disable behavior. |
| SENSE (Pin 4) | Output Voltage Feedback Input | Connects to output divider node; internal 1.25V reference compares against scaled output to regulate VOUT with ±4% accuracy over temperature. |
| ILIM (Pin 5) | Peak Switch Current Programming | Resistor-to-ground sets trip point between 400mA and 1.25A; enables soft-start and inductor optimization without changing layout. |
| VIN (Pin 6) | Main Power Input | Accepts 1.8V–6V input; requires local 0.1µF ceramic + bulk electrolytic bypassing to suppress high-frequency switching noise. |
| SW (Pin 7) | Internal Switch Collector Node | Drives external inductor/diode; trace must be short and wide to minimize radiated EMI and voltage overshoot during turn-off. |
| PGND (Pin 8) | Power Ground Return | High-current return for switch and inductor; must be joined to GND (Pin 1) directly under package to avoid ground bounce in burst-mode transitions. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode™ Operation | Maintains >75% efficiency at 1mA load by gating oscillator cycles, eliminating continuous switching losses in standby. |
| Integrated Low-VCE(SAT) NPN Switch | 170mV typical at 700mA reduces conduction loss by ~4× vs prior generation, directly improving thermal performance in sealed enclosures. |
| Programmable Output Voltage | Single-pin logic select (SEL) eliminates external resistor dividers, saving board space and enabling firmware-controlled rail configuration. |
| ILIM-Based Peak Current Scaling | Enables use of smaller, lower-cost inductors (e.g., 10µH instead of 22µH) while preserving stability-verified with Coilcraft DO1608-103 and Sumida CD54-100. |
| 155kHz Fixed-Frequency Oscillator | Supports consistent EMI filtering design and predictable inductor sizing; avoids frequency jitter seen in hysteretic converters. |
Applications
| Palmtop Computers | Portable Instruments |
|---|---|
Use Scenario: Powering 3.3V logic and 5V analog subsystems from two AA cells in handheld test meters. IC Role / Device Role / Timing Role: Primary step-up regulator generating stable 3.3V/5V rails with automatic load-dependent mode switching. Use Value: 120µA quiescent current extends battery life beyond 100 hours in intermittent-use field instruments. |
Use Scenario: Supplying LCD contrast voltage (–4V to –29V) and microcontroller core voltage in portable oscilloscopes. IC Role / Device Role / Timing Role: High-efficiency boost stage feeding inverting charge pump; SEL pin toggled to match display brightness settings. Use Value: 88% efficiency at 200mA ensures minimal self-heating inside thermally isolated instrument enclosures. |
| Bar-Code Scanners | PCMCIA Cards |
Use Scenario: Providing 5V for laser diode driver and CCD sensor interface from single-cell lithium or two-cell alkaline. IC Role / Device Role / Timing Role: Main DC/DC converter with SHDN controlled by host processor to disable power between scan bursts. Use Value: 10µA shutdown current prevents measurable battery drain during 95% idle time in retail scanning duty cycles. |
Use Scenario: Generating 3.3V I/O and 5V card-bus interface rails in legacy PCMCIA modems and network adapters. IC Role / Device Role / Timing Role: Dual-output capable regulator using SEL pin to match host bus voltage negotiation protocol. Use Value: ILIM programming allows use of 10µH inductors compatible with thin PCMCIA form factor (≤5.5mm height). |
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 |
|---|---|---|---|
| LTC3525EDD#TRMPBF | Higher 2MHz switching frequency; synchronous rectification; 300mA max output; requires external MOSFET gate drive. | Better suited for ultra-thin devices needing <1mm profile inductors; less optimal for alkaline battery chemistries due to higher IQ (25µA vs 120µA). | Choose LTC3525EDD#TRMPBF when board area is constrained and Li-ion input is used; avoid for AA/AAA primary cell longevity-critical designs. |
| MAX770ESA+ | Fixed 5V output only; 1.5V min input; 100mA max output; no ILIM or SEL pins; 100kHz oscillator. | Simpler implementation for single-rail, low-current applications; lacks programmability and light-load efficiency optimization. | Choose MAX770ESA+ only for cost-sensitive, fixed-5V, sub-100mA applications where Burst Mode™ and dual-voltage flexibility are unnecessary. |
Compared with LT1300CS8#PBF, LTC3525EDD#TRMPBF offers higher frequency and sync rectification but sacrifices micropower performance on primary cells, while MAX770ESA+ trades flexibility and efficiency for simplicity and lower BOM count in fixed-rail designs.
Availability
LT1300CS8#PBF is available at Aetrix Electronics and suitable for portable instrumentation, barcode scanning terminals, and PCMCIA card power management requiring stable component supply across extended production lifecycles.
Supply support for LT1300CS8#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 technical and manufacturing continuity for legacy Linear power products.
The LT1300CS8#PBF belongs to Linear's micropower DC/DC converter family, engineered specifically for battery-powered portable electronics where input voltage sag, standby current, and board area are critical constraints.
FAQ
What is the minimum input voltage required for LT1300CS8#PBF to regulate a 5V output?
The LT1300CS8#PBF guarantees regulation at 5V output with input as low as 1.8V, per Absolute Maximum Ratings and Electrical Characteristics tables. At VIN = 2.0V, it delivers up to 220mA into 5V load with >74% efficiency. Below 1.8V, operation is not specified and may result in unregulated output or dropout.
How does the ILIM pin affect inductor selection for LT1300CS8#PBF?
The ILIM pin directly sets peak switch current: floating → 1.25A, grounded → ~400mA. For 400mA peak, inductors like Sumida CD54-100 (10µH, 0.11Ω DCR) or Coilcraft DO1608-103 are validated. Higher peak currents require ≥1.25A saturation rating (e.g., DO3316-223). Using ILIM to reduce peak current allows smaller, lower-cost inductors without sacrificing stability in LT1300CS8#PBF designs.
Can LT1300CS8#PBF generate both 3.3V and 5V outputs simultaneously?
No. The LT1300CS8#PBF provides a single regulated output whose voltage is selected between 3.3V and 5V via the SEL pin. It cannot produce two independent outputs. For dual-rail generation, two separate LT1300CS8#PBF units or a multi-output controller like the LTC3526 would be required. The SEL pin must be held static during operation to maintain regulation accuracy.
What is the purpose of the PGND pin on LT1300CS8#PBF, and how should it be connected?
PGND (Pin 8) is the dedicated power ground return for the internal switch and external inductor current path. It must be tied to GND (Pin 1) directly beneath the LT1300CS8#PBF package using a low-inductance connection - not through a shared PCB trace. This minimizes ground bounce during high di/dt switching events and ensures accurate SENSE pin referencing, preventing output voltage drift or oscillation in LT1300CS8#PBF applications.
Is LT1300CS8#PBF RoHS compliant and lead-free?
Yes. The LT1300CS8#PBF carries the #PBF suffix, indicating Pb-free (lead-free) finish and full RoHS compliance per EU Directive 2011/65/EU. The SOIC package uses matte tin plating over copper leadframe, with maximum lead content <1000 ppm. This is confirmed in Linear Technology's official packaging documentation and Analog Devices' product change notices for the LT1300 family.
LT1300CS8#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, 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#PBF FAQ
1.How can I place an order for LT1300CS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1300CS8#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 LT1300CS8#PBF reliable?
The price and inventory of LT1300CS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1300CS8#PBF is usually 5 days.
3.What payment methods are accepted for LT1300CS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1300CS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1300CS8#PBF?
LT1300CS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1300CS8#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 LT1300CS8#PBF?
For technical support, including LT1300CS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1300CS8#PBF requirements.
6.How does Aetrix verify that LT1300CS8#PBF is sourced from the original manufacturer or authorized distributors?
All LT1300CS8#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 LT1300CS8#PBF meets industry standards.
7.What is the process for return or replacement of LT1300CS8#PBF?
All LT1300CS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1300CS8#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 LT1300CS8#PBF part is unused and in its original packaging.
Return procedure for LT1300CS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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