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Analog Devices Inc. LT1301IS8#PBF
- Part No.:
- LT1301IS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1301IS8#PBF.pdf
- Description:
- IC REG BOOST PROG 750MA 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:4,691
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Product details
Overview
LT1301IS8#PBF from Analog Devices (formerly Linear Technology) is a micropower step-up DC/DC converter with Burst Mode™ operation, delivering regulated 5V or 12V output from input voltages as low as 1.8V. It integrates a low-VCE(SAT) bipolar switch (170mV at 1A), programmable peak current limit via ILIM pin, and 155kHz internal oscillator. Used in flash memory VPP generation and portable instrumentation requiring high efficiency at light loads.
For engineers reviewing the LT1301IS8#PBF datasheet, LT1301IS8#PBF pinout, LT1301IS8#PBF application, or LT1301IS8#PBF equivalent, key selection criteria include input voltage range (1.8–6V), selectable dual-output regulation (5V/12V), shutdown current (10µA), quiescent current (120µA), and SOIC-8 package compatibility with surface-mount inductor designs.
Technical Context
The LT1301IS8#PBF employs a fixed-frequency (155kHz) burst-mode control architecture with internal 1.25V reference and dual comparators for output regulation and current limiting. Its bipolar power switch enables low saturation voltage without external gate drive, while the ILIM pin directly programs peak switch current using resistor-to-ground or floating configurations.
Operation relies on feedback from the SENSE pin through an internal resistive divider to regulate output voltage; logic-level SELECT pin toggles between 5V and 12V setpoints. Shutdown functionality disables switching and reduces total supply current to 10µA, with bias current specified up to 20µA at SHDN = 5V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 1.8V to 6V - Enables operation down to near-dead battery levels in two-cell alkaline or Li-ion systems. |
| Output Voltage Options | Programmable 5V or 12V - Selected by logic level on SELECT pin; no external resistors required. |
| Switch Saturation Voltage | 170mV typical at 1A - Reduces conduction loss and improves efficiency over prior CMOS-switched converters. |
| Quiescent Current | 120µA at no load - Minimizes battery drain during standby in always-on portable devices. |
| Shutdown Current | 10µA - Allows deep sleep mode with negligible battery leakage. |
| Oscillator Frequency | 155kHz typical - Enables use of compact, low-DCR surface-mount inductors (e.g., 33µH). |
| Peak Switch Current Limit | 1.0A typical (ILIM floating); 400mA (ILIM grounded) - Configurable for soft-start or reduced inductor size. |
Pinout & Package
LT1301IS8#PBF is housed in an 8-lead plastic SOIC (S8) package, RoHS-compliant and rated for industrial temperature range (–40°C to +85°C). Pin spacing is 1.27mm, body width 3.9mm, and maximum height 1.75mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 1) | Signal Ground Reference | Must be tied to PGND under package; forms reference for internal comparators and bias circuits. |
| SEL (Pin 2) | Output Voltage Select Input | Logic-high (≥1.5V) selects 12V output; grounded or floating selects 5V output. |
| SHDN (Pin 3) | Active-High Shutdown Control | Pull ≥1.8V to disable switching; draws ≤20µA bias current; valid even with VIN floating. |
| SENSE (Pin 4) | Feedback Input | Connects to output divider node; requires 0.1µF ceramic capacitor to GND when regulating 5V. |
| ILIM (Pin 5) | Peak Current Limit Programming | Float for 1A limit; ground for ~400mA; resistor-to-ground sets intermediate values for soft-start or smaller inductors. |
| VIN (Pin 6) | Main Power Input | Bypass with ≥47µF low-ESR capacitor within 0.2″ of pin and PGND to suppress ripple and EMI. |
| SW (Pin 7) | Switch Node | Drives external inductor and Schottky diode; layout must minimize trace length to reduce RF emissions. |
| PGND (Pin 8) | Power Ground Return | High-current return path for switch and input capacitor; tie directly to GND (Pin 1) under package. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode™ Operation | Maintains 78–89% efficiency at loads from 1mA to 120mA, minimizing idle current draw in battery-powered systems. |
| Integrated Bipolar Switch | Eliminates need for external MOSFET driver; 170mV VCE(SAT) at 1A reduces thermal stress and improves light-load efficiency vs. CMOS alternatives. |
| Programmable Output Voltage | Single-pin logic control (SEL) switches regulation setpoint between 5V ±2.5% and 12V ±4%, supporting dual-voltage system rails. |
| Configurable Peak Current Limit | ILIM pin allows resistor-based tuning of switch current from 400mA to 1.25A, enabling optimized inductor sizing and soft-start behavior. |
| Low-Noise 155kHz Oscillator | Enables use of small, low-DCR surface-mount inductors (e.g., Coilcraft DO3316-333) without compromising EMI performance. |
Applications
| Flash Memory VPP Generation | Palmtop Computer Power |
|---|---|
Use Scenario: Generating +12V programming voltage for NOR/NAND flash memory chips in embedded data loggers. IC Role / Device Role / Timing Role: Step-up DC/DC converter providing regulated, low-noise VPP during write/erase cycles. Use Value: Delivers stable 12V at up to 120mA from 3.3V main rail with 89% efficiency, extending battery life between firmware updates. | Use Scenario: Supplying 5V auxiliary rail for LCD backlight drivers and peripheral interfaces in handheld PDAs. IC Role / Device Role / Timing Role: Micropower boost converter operating from partially discharged AA batteries (1.8–3.3V). Use Value: Maintains regulation down to 1.8V input with only 120µA quiescent current, enabling >20% longer runtime versus CMOS-based alternatives. |
| Portable Instrumentation | PCMCIA Card Power |
Use Scenario: Powering analog front-end circuitry (ADC bias, op-amp rails) in handheld multimeters and oscilloscopes. IC Role / Device Role / Timing Role: Low-ripple, high-efficiency voltage booster supplying clean 5V from single-cell lithium or two-cell alkaline sources. Use Value: Achieves <100mVpp output ripple with 33µF tantalum output capacitor, meeting noise-sensitive analog measurement requirements. | Use Scenario: Providing isolated 5V or 12V for PCMCIA Type II card peripherals in laptop expansion slots. IC Role / Device Role / Timing Role: Compact, thermally efficient boost converter mounted directly on card PCB. Use Value: SOIC-8 footprint and 1.75mm max height allow integration into space-constrained PCMCIA form factor without heatsinking. |
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 | CMOS synchronous rectification; 2MHz switching; 3mm × 2mm DFN package; higher IQ (25µA) but lower max output current (100mA). | Better suited for ultra-compact, high-frequency designs where board area is critical and load current ≤100mA. | Select LTC3525EDD#TRMPBF when footprint reduction and higher switching frequency outweigh need for 120mA output capability. |
| MAX771CPA+ | Fixed 5V output only; 100kHz oscillator; DIP-8 package; higher VCE(SAT) (300mV); no ILIM pin or SELECT function. | Limited to single-output applications; lacks programmability and low-quiescent features of LT1301IS8#PBF. | Choose MAX771CPA+ only for legacy DIP-based designs requiring simple 5V boost with minimal BOM changes. |
Compared with LTC3525EDD#TRMPBF and MAX771CPA+, the LT1301IS8#PBF uniquely combines dual-output programmability, 120mA capability, 120µA quiescent current, and SOIC-8 industrial-temp packaging-making it optimal for portable instrumentation requiring flexible, battery-efficient voltage boosting.
Availability
LT1301IS8#PBF is available at Aetrix Electronics and suitable for flash memory programming, palmtop computing, portable instrumentation, bar-code scanning, and PCMCIA card power applications requiring stable component supply across industrial temperature ranges and long production lifecycles.
Supply support for LT1301IS8#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 product support, documentation, and manufacturing continuity for legacy Linear parts including the LT1301 series.
The LT1301IS8#PBF belongs to Linear's micropower DC/DC converter family, designed specifically for battery-operated portable equipment where extended runtime, low-noise output, and minimal PCB area are critical design constraints.
FAQ
What is the operating temperature range for the LT1301IS8#PBF?
The LT1301IS8#PBF is rated for industrial temperature operation from –40°C to +85°C. This specification is confirmed in the Absolute Maximum Ratings table and applies across all electrical parameters unless otherwise noted. The "I" grade designation in LT1301IS8#PBF explicitly denotes this extended temperature range, distinguishing it from the commercial-grade LT1301CS8#PBF (0°C to 70°C).
Can the LT1301IS8#PBF generate both 5V and 12V outputs on the same board?
Yes, the LT1301IS8#PBF supports dynamic switching between 5V and 12V outputs using the SEL pin. When SEL is pulled high (≥1.5V), the device regulates at 12V; when grounded or left floating, it regulates at 5V. This allows a single LT1301IS8#PBF to serve dual-rail systems-such as powering both logic (5V) and flash VPP (12V)-without hardware changes.
How does the ILIM pin affect inductor selection for the LT1301IS8#PBF?
The ILIM pin directly determines peak switch current, which governs inductor saturation requirements. With ILIM floating, peak current is ~1A, requiring ≥1.25A saturation rating (e.g., Coilcraft DO3316-333). Grounding ILIM reduces peak current to ~400mA, permitting smaller, lower-cost inductors like Sumida CD73-330KC. This flexibility lets designers optimize size, cost, and efficiency per application load profile.
Is a capacitor required on the SENSE pin of the LT1301IS8#PBF?
Yes-a 0.1µF ceramic capacitor is required between SENSE (Pin 4) and GND when the LT1301IS8#PBF is configured for 5V output. This capacitor stabilizes the feedback loop and prevents oscillation. No such capacitor is needed for 12V operation. The requirement is explicitly stated in the PIN FUNCTIONS section and Figure 1 schematic notes.
What is the minimum input voltage at which the LT1301IS8#PBF maintains regulation?
The LT1301IS8#PBF guarantees operation down to 1.8V input, as specified in both the FEATURES list and ABSOLUTE MAXIMUM RATINGS. At this voltage, it can still deliver regulated 5V or 12V output (depending on SEL state) with measurable efficiency-enabling full utilization of battery capacity in two-cell alkaline or single-cell Li-ion systems before cutoff.
LT1301IS8#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
- Output Configuration:
- Positive
- Topology:
- Boost
- Output Type:
- Programmable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 1.8V
- Voltage - Input (Max):
- 9.5V
- Voltage - Output (Min/Fixed):
- 5V, 12V
- Voltage - Output (Max):
- -
- Current - Output:
- 750mA (Switch)
- Frequency - Switching:
- 155kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LT1301IS8#PBF FAQ
1.How can I place an order for LT1301IS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1301IS8#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 LT1301IS8#PBF reliable?
The price and inventory of LT1301IS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1301IS8#PBF is usually 5 days.
3.What payment methods are accepted for LT1301IS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1301IS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1301IS8#PBF?
LT1301IS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1301IS8#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 LT1301IS8#PBF?
For technical support, including LT1301IS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1301IS8#PBF requirements.
6.How does Aetrix verify that LT1301IS8#PBF is sourced from the original manufacturer or authorized distributors?
All LT1301IS8#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 LT1301IS8#PBF meets industry standards.
7.What is the process for return or replacement of LT1301IS8#PBF?
All LT1301IS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1301IS8#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 LT1301IS8#PBF part is unused and in its original packaging.
Return procedure for LT1301IS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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