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Analog Devices Inc. LT1301CS8#TRPBF
- Part No.:
- LT1301CS8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1301CS8#TRPBF.pdf
- Description:
- IC REG BOOST PROG 750MA 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:1,046
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Product details
Overview
LT1301CS8#TRPBF 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 1.8V–6V input. It integrates a low-VCE(SAT) bipolar switch (170mV at 1A), programmable peak current via ILIM pin, and 155kHz oscillator for compact inductor sizing. Used in flash memory VPP generation and portable instrumentation requiring high efficiency at light loads.
For engineers reviewing the LT1301CS8#TRPBF datasheet, LT1301CS8#TRPBF pinout, LT1301CS8#TRPBF application, or LT1301CS8#TRPBF equivalent, key selection criteria include input voltage down to 1.8V, 120µA no-load quiescent current, shutdown current of 10µA, selectable 5V/12V output, and SOIC-8 package compatibility with surface-mount inductor designs.
Technical Context
The LT1301CS8#TRPBF employs a fixed-frequency, current-mode boost architecture with internal 155kHz oscillator and bipolar power switch. Its Burst Mode™ operation enables ultra-low quiescent current by cycling the switch only when output voltage droops below regulation threshold, minimizing switching losses at light loads.
Regulation is achieved via a precision 1.25V reference and resistive feedback divider connected to the SENSE pin. Output voltage selection (5V or 12V) is controlled by the SEL pin logic level, while the ILIM pin sets peak switch current between 400mA (grounded) and 1A (floating), directly affecting inductor size and efficiency trade-offs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 1.8V to 6V - Enables operation from two alkaline cells or single Li-ion cell with headroom for battery discharge. |
| Output Voltage Options | Programmable 5V or 12V - Selected via SEL pin logic level; supports flash memory VPP and LCD bias rails. |
| Quiescent Current | 120µA typical - Minimizes battery drain during standby in portable instruments and PDAs. |
| Shutdown Current | 10µA - Reduces system-level power consumption when device is inactive. |
| Switch Saturation Voltage | 170mV at 1A - Low conduction loss improves efficiency, especially critical in 12V output mode. |
| Oscillator Frequency | 155kHz typical - Allows use of small, low-DCR surface-mount inductors (e.g., 33µH) without excessive EMI. |
| Peak Switch Current Limit | Programmable 400mA–1A via ILIM pin - Enables optimization of inductor size and thermal performance for specific load profiles. |
| Efficiency | Up to 89% at 120mA - Achieved with optimized external components (Schottky diode, low-ESR capacitors, low-DCR inductor). |
Pinout & Package
LT1301CS8#TRPBF is housed in an 8-lead plastic SOIC package (S8), measuring 0.189–0.197 inches wide and 0.228–0.244 inches long, with standard 1.27mm pitch. The package is RoHS-compliant and designed for reflow soldering.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 1) | Signal Ground Reference | Low-impedance return path for internal comparators and reference; must be tied to PGND under package. |
| SEL (Pin 2) | Output Voltage Select | Logic-high (≥1.5V) selects 12V output; grounded or floating selects 5V output - enables dynamic rail switching. |
| SHDN (Pin 3) | Shutdown Control | Pull high (>1.8V) to disable switching and reduce supply current to 10µA; active-low enable logic. |
| SENSE (Pin 4) | Feedback Input | Connects to resistor divider from output; requires 0.1µF ceramic capacitor to ground for 5V mode stability. |
| ILIM (Pin 5) | Peak Current Programming | Resistor-to-ground sets trip point between 400mA and 1A; also enables soft-start by limiting inrush current. |
| VIN (Pin 6) | Main Power Input | 1.8V–6V supply input; requires local electrolytic bypass (≥47µF) within 0.2" of pin and PGND. |
| SW (Pin 7) | Switch Node | Drives external inductor and Schottky diode; layout must minimize trace length to reduce EMI and switching losses. |
| PGND (Pin 8) | Power Ground Return | High-current return for switch and input capacitor; tied to GND (Pin 1) under package to avoid ground bounce. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode™ Operation | Reduces no-load quiescent current to 120µA by gating switching activity - extends battery life in intermittent-use devices. |
| Integrated Bipolar Power Switch | 170mV VCE(SAT) at 1A - delivers higher efficiency than CMOS-based converters at medium load currents. |
| Programmable Output Voltage | Single-pin SEL logic control toggles between 5V and 12V - eliminates need for external voltage-setting resistors or jumpers. |
| ILIM Pin Programmability | Adjusts peak switch current from 400mA to 1A using one external resistor - allows inductor downsizing without sacrificing full-load capability. |
| 155kHz Internal Oscillator | Enables use of compact, low-DCR surface-mount inductors (e.g., 33µH) - reduces board area and cost vs. lower-frequency alternatives. |
| Wide Input Voltage Range | Operates from 1.8V minimum - extracts maximum energy from aging alkaline or NiMH batteries in portable systems. |
Applications
| Flash Memory VPP Generation | Palmtop Computer Power Rails |
|---|---|
Use Scenario: Generating +12V programming voltage for NOR/NAND flash memory in embedded systems with 3.3V or 5V main supply. IC Role / Device Role / Timing Role: Step-up DC/DC converter providing regulated, low-noise 12V output with fast transient response to support flash write cycles. Use Value: Eliminates need for separate high-voltage charge pump IC or transformer-based solution - reduces BOM count and PCB footprint. | Use Scenario: Supplying auxiliary 5V or 12V rails in palmtop computers where battery voltage drops below required system voltages. IC Role / Device Role / Timing Role: Micropower boost regulator maintaining stable output during battery discharge from 3.3V to 1.8V. Use Value: 120µA quiescent current and 10µA shutdown current extend usable runtime between charges in always-on portable computing devices. |
| Bar-Code Scanner High-Voltage Bias | PCMCIA Card Interface Supply |
Use Scenario: Providing 12V bias for laser diode drivers or CCD sensor bias in handheld bar-code scanners powered by AA batteries. IC Role / Device Role / Timing Role: Efficient boost converter delivering up to 120mA at 12V with minimal input voltage sag during burst operation. Use Value: Up to 89% efficiency at 120mA ensures consistent scanner performance across battery life without thermal derating. | Use Scenario: Generating 5V or 12V interface supply for PCMCIA cards in laptops or industrial controllers with variable input bus voltage. IC Role / Device Role / Timing Role: Programmable-output DC/DC converter supporting both 5V and 12V PCMCIA standards via SEL pin control. Use Value: Single-component solution replaces dual-rail discrete designs - simplifies compliance testing and reduces layout complexity. |
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 |
|---|---|---|---|
| LTC3400ES6#TRMPBF | CMOS synchronous rectification; 2MHz switching; 20µA quiescent current; SOT-23-6 package. | Better light-load efficiency and smaller solution size, but lower max output current (400mA vs 1A). | Select for ultra-low-power, space-constrained designs where 12V@120mA is sufficient and 2MHz operation avoids audible noise. |
| TPS61040DRVR | CMOS-based; 500kHz switching; 25µA quiescent current; integrated Schottky diode; 6-pin WSON package. | Higher integration (no external diode), but lacks programmable output voltage and ILIM pin for current limiting. | Select when fixed 5V output suffices and board area is premium; not suitable for 12V flash VPP or adjustable current limiting. |
Compared with LTC3400ES6#TRMPBF and TPS61040DRVR, the LT1301CS8#TRPBF offers superior high-current efficiency due to its bipolar switch and programmable 12V output, making it uniquely suited for flash memory programming and portable instrumentation requiring robust 120mA delivery at 12V.
Availability
LT1301CS8#TRPBF is available at Aetrix Electronics and suitable for flash memory programming, portable instrumentation, and barcode scanner power supplies requiring stable component supply and long-term industrial availability.
Supply support for LT1301CS8#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 legacy of high-performance analog and power management ICs. Linear Technology was founded in 1981 and specialized in innovative DC/DC conversion, precision references, and signal conditioning.
The LT1301CS8#TRPBF belongs to Linear Technology's micropower DC/DC converter product line, designed specifically for battery-powered portable equipment where extended operating life, small solution size, and reliable high-voltage generation are critical.
FAQ
What is the minimum input voltage required for LT1301CS8#TRPBF to regulate 12V output?
The LT1301CS8#TRPBF guarantees operation down to 1.8V input, but to sustain 12V output under load, VIN must exceed ~2.0V due to duty-cycle limitations and switch saturation losses. At 1.8V input, full 12V/120mA output is not achievable; typical usable range starts at 2.0V for 12V mode. The LT1301CS8#TRPBF datasheet specifies 1.8V as absolute minimum for functional operation, not full-load regulation.
Can LT1301CS8#TRPBF be used to generate negative output voltages?
Yes, the LT1301CS8#TRPBF can be configured as an inverting converter to generate negative outputs such as –5V or –12V using standard buck-boost topology. Figure TA7 in the LT1301CS8#TRPBF datasheet shows a verified –5V, 300mA design with external diode and inductor. Polarity reversal requires careful layout of SW and PGND nodes to maintain stability and minimize noise coupling.
How does the ILIM pin affect efficiency in LT1301CS8#TRPBF designs?
The ILIM pin on the LT1301CS8#TRPBF sets peak switch current, directly influencing conduction losses in the internal transistor, inductor, and external diode. Lowering peak current (e.g., to 400mA via grounding ILIM) reduces I²R losses and extends alkaline battery life, though full-load efficiency may drop slightly due to increased duty cycle. The LT1301CS8#TRPBF efficiency curves show measurable improvement at light-to-moderate loads when ILIM is adjusted.
Is LT1301CS8#TRPBF pin-compatible with LT1300 or LT1302?
No, the LT1301CS8#TRPBF is not pin-compatible with LT1300 or LT1302. While all three are Linear Technology step-up converters, they differ in pin functions: LT1300 uses different SENSE/FEEDBACK topology and lacks ILIM pin; LT1302 has distinct SHDN and SYNC pin assignments. The LT1301CS8#TRPBF pinout (GND/SEL/SHDN/SENSE/ILIM/VIN/SW/PGND) is unique to its family and requires dedicated PCB layout.
What external components are mandatory for stable LT1301CS8#TRPBF operation at 5V output?
For stable 5V operation, the LT1301CS8#TRPBF requires: (1) a 0.1µF ceramic capacitor from SENSE (Pin 4) to GND, (2) ≥47µF low-ESR input capacitor tied between VIN (Pin 6) and PGND (Pin 8) within 0.2", and (3) a Schottky diode (e.g., 1N5817) and 33µH inductor. Omitting the SENSE capacitor causes regulation instability and excessive ripple - this requirement is explicitly stated in the LT1301CS8#TRPBF datasheet.
LT1301CS8#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:
- 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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LT1301CS8#TRPBF FAQ
1.How can I place an order for LT1301CS8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1301CS8#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 LT1301CS8#TRPBF reliable?
The price and inventory of LT1301CS8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1301CS8#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1301CS8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1301CS8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1301CS8#TRPBF?
LT1301CS8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1301CS8#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 LT1301CS8#TRPBF?
For technical support, including LT1301CS8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1301CS8#TRPBF requirements.
6.How does Aetrix verify that LT1301CS8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1301CS8#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 LT1301CS8#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1301CS8#TRPBF?
All LT1301CS8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1301CS8#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 LT1301CS8#TRPBF part is unused and in its original packaging.
Return procedure for LT1301CS8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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