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Analog Devices Inc. LT1501IS8-3.3
- Part No.:
- LT1501IS8-3.3
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1501IS8-3.3.pdf
- Description:
- IC REG BST CUK FLYBK 3.3V 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,750
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Product details
Overview
LT1501IS8-3.3 from Analog Devices (formerly Linear Technology) is an adaptive-frequency current mode step-up DC/DC switching regulator with internal 700mA NPN power switch, fixed 3.3V output, and 8-pin SOIC package. It operates from 1.8V to 15V input, delivers up to 200mA at 3.3V, maintains 1.265V feedback reference, and achieves micropower shutdown current of 8µA. It is used in battery-powered portable instrumentation requiring stable low-noise boost conversion.
For engineers reviewing the LT1501IS8-3.3 datasheet, LT1501IS8-3.3 pinout, LT1501IS8-3.3 application, or LT1501IS8-3.3 equivalent, key selection criteria include input voltage range (1.8–15V), fixed 3.3V output tolerance (±2.1%), adaptive-frequency operation (up to 500kHz), internal frequency compensation, and low-battery comparator functionality active in shutdown.
Technical Context
The LT1501IS8-3.3 uses a current-mode control architecture without an internal oscillator-switching frequency adapts dynamically based on inductor value, input/output voltages, and load. Its peak-to-peak inductor current is internally set and scaled downward at light loads to avoid audio-range frequencies, enabling high efficiency across wide load ranges.
It integrates a 0.28Ω current-sense resistor, 30V-rated switch, and low-battery comparator with 1.24V threshold and 20mV hysteresis. Unlike the LT1500, it omits SYNC, VC, NFB/SELECT, SS, and PGND pins-relying on internal compensation and simplified pinout for compact 8-pin SO packaging.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±2.1% over full temperature and line/load range-ensures stable rail for 3.3V logic and analog circuitry without external divider. |
| Input Voltage Range | 1.8V to 15V-supports single-cell Li-ion (2.7–4.2V), dual-cell alkaline/NiCd (2.0–3.2V), and industrial 5V/12V rails. |
| Max Output Current | 200mA typical at VIN ≥ 2.3V and VOUT = 3.3V-sufficient for microcontrollers, sensors, and RF modules in portable systems. |
| Quiescent Current | 200µA typical-enables long battery life in always-on monitoring applications. |
| Shutdown Current | 8µA typical at TJ ≥ 0°C-preserves battery charge during system sleep modes. |
| Switch On Resistance | 0.50Ω typical-minimizes conduction loss and improves efficiency at medium loads. |
| Low-Battery Threshold | 1.24V ±0.04V with 20mV hysteresis-provides accurate, noise-immune battery monitoring while remaining active in shutdown. |
Pinout & Package
LT1501IS8-3.3 is housed in an 8-pin plastic SOIC (SO-8) package with standard 1.27mm pitch, JEDEC MS-012AC compliant, and rated for –40°C to 85°C industrial ambient operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (FB/OUT) | Feedback / Fixed Output Node | Internally connected to top of 3.3V divider; provides regulated 3.3V output and serves as error amplifier inverting input reference point. |
| 2 (LBI) | Low-Battery Input | Analog input to comparator with 1.24V threshold; remains powered in shutdown to monitor battery health during standby. |
| 3 (LBO) | Low-Battery Open-Collector Output | Sinks up to 2mA when LBI falls below threshold; requires external pull-up for logic-level flag generation. |
| 4 (SW) | Switch Collector | High-side collector of internal 700mA NPN switch; connects to inductor and catch diode anode-requires short, low-inductance PCB routing. |
| 5 (SHDN) | Logic-Level Shutdown Control | Active-high input; >1.1V enables regulation, ≤0.4V disables switching while preserving LBI/LBO functionality. |
| 6 (VIN) | Main Power Input | Supplies bias and switch drive; accepts 1.8–15V; must be bypassed with low-ESR capacitor near pin. |
| 7 (ISENSE) | Current Sense Input | Connects to inductor's grounded end; interfaces with internal 0.28Ω sense resistor for peak-current mode control. |
| 8 (GND) | Power Ground | Carries full switch return current; must connect directly to low-impedance ground plane to minimize noise and voltage drop. |
Key Features
| Feature | Design Value |
|---|---|
| Adaptive-frequency current mode control | Eliminates subharmonic oscillation and avoids audible noise by dynamically adjusting switching frequency-no external oscillator or slope compensation required. |
| Burst Mode™ operation | Activates only at very light loads (<1mA), reducing quiescent current to 8µA while maintaining regulation-critical for multi-year battery life in IoT sensors. |
| Internal frequency compensation | Enables stable loop response with standard tantalum or ceramic output capacitors-no external RC network needed, simplifying layout and BOM. |
| Low-battery comparator with shutdown persistence | Provides reliable battery monitoring down to 1.24V with 20mV hysteresis, and remains fully functional even when main regulator is disabled-essential for graceful system power-down. |
| High-efficiency 700mA integrated switch | 0.50Ω typical RON and 30V breakdown rating support efficient boost conversion from 1.8V inputs up to 15V outputs with minimal external components. |
Applications
| Portable Medical Sensors | Battery-Powered Data Loggers |
|---|---|
Use Scenario: Continuous ECG or temperature sensing in handheld diagnostic devices powered by two AA alkaline cells (2.0–3.2V). IC Role / Device Role / Timing Role: Step-up regulator generating stable 3.3V supply for ultra-low-power MCU, ADC, and BLE radio-maintaining regulation as battery voltage declines. Use Value: Adaptive-frequency operation prevents audible coil whine during measurement; 8µA shutdown current extends shelf life beyond 5 years. | Use Scenario: Remote environmental monitoring node using Li-ion battery (2.7–4.2V) and solar trickle charge, logging data every 10 minutes. IC Role / Device Role / Timing Role: Primary 3.3V power source for microcontroller, flash memory, and analog front-end-active only during brief wake-up intervals. Use Value: Burst Mode™ ensures <200µA average supply current during sleep, enabling >3-year operation on 1000mAh cell without recharging. |
| Industrial Handheld Scanners | Smart Meter Auxiliary Power |
Use Scenario: Barcode scanner operating from 3.6V NiMH pack, requiring clean 3.3V rail for CMOS image sensor and laser driver. IC Role / Device Role / Timing Role: Boost converter delivering low-noise 3.3V output with fast transient response to handle pulsed laser current demands. Use Value: Current-mode control provides inherent cycle-by-cycle current limiting and stable operation under dynamic load steps up to 150mA. | Use Scenario: Secondary power rail in utility smart meter, deriving 3.3V from 5V PLC or RF subsystem supply during mains outage. IC Role / Device Role / Timing Role: Standby power regulator maintaining real-time clock, SRAM, and communication interface during brownout conditions. Use Value: Low-battery comparator monitors auxiliary supply voltage and triggers controlled shutdown before critical data loss occurs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3525EDD-3.3 | Higher 4MHz fixed-frequency operation, 400mA output, no integrated LBO/LBI, requires external compensation. | Better suited for space-constrained designs needing smaller inductors; lacks battery monitoring features. | Select when board area is critical and low-battery detection is handled elsewhere. |
| TPS61040DRVR | 500kHz fixed frequency, 28V switch, 0.5A output, 20µA shutdown, no LBO/LBI, different feedback reference (1.23V). | Offers higher output current and wider input range but requires external resistor divider and lacks integrated battery monitoring. | Select when higher load current (>200mA) or extended input voltage (>15V) is required. |
Compared with LTC3525EDD-3.3 and TPS61040DRVR, the LT1501IS8-3.3 uniquely combines adaptive-frequency noise reduction, integrated low-battery flagging, and true micropower shutdown-making it optimal for battery-critical portable instrumentation where reliability and runtime outweigh raw current capability.
Availability
LT1501IS8-3.3 is available at Aetrix Electronics and suitable for portable medical sensors, battery-powered data loggers, industrial handheld scanners, and smart meter auxiliary power requiring stable component supply and long-term lifecycle assurance.
Supply support for LT1501IS8-3.3 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, Inc. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors.
The LT1501IS8-3.3 belongs to Linear's legacy adaptive-frequency boost regulator family, designed specifically for micropower, low-noise, battery-operated applications where efficiency across light-to-moderate loads and integrated system monitoring are essential.
FAQ
What is the maximum output current capability of the LT1501IS8-3.3?
The LT1501IS8-3.3 delivers up to 200mA at 3.3V output when input voltage is ≥2.3V and ambient temperature is within the industrial range (–40°C to 85°C). Maximum load current decreases as input voltage drops-e.g., ~100mA at VIN = 2.0V. This is defined by internal switch current limit (0.7A min), on-resistance (0.50Ω typ), and thermal limits of the SO-8 package.
Does the LT1501IS8-3.3 require external compensation components?
No, the LT1501IS8-3.3 does not require external compensation components. It features fully internal frequency compensation optimized for stability with standard tantalum or ceramic output capacitors-unlike the LT1500, which exposes the VC pin for external RC networks. This simplifies design and reduces bill-of-materials count.
How does the low-battery comparator function in shutdown mode for the LT1501IS8-3.3?
The low-battery comparator in the LT1501IS8-3.3 remains fully operational during shutdown: LBI continues sampling battery voltage, and LBO asserts low when LBI falls below 1.24V (±0.04V). This allows host systems to monitor battery health and initiate controlled shutdown-even when the main regulator is disabled-without additional supervisory ICs.
What is the typical switching frequency range of the LT1501IS8-3.3 under varying load conditions?
The LT1501IS8-3.3 exhibits adaptive-frequency behavior: at 100mA load and VIN = 2.3V, frequency is ~250kHz with a 33µH inductor; it rises to ~450kHz at 200mA and drops into Burst Mode™ below ~1mA, where discrete switching bursts occur at ~1–5Hz. Frequency varies inversely with inductor value-e.g., 10µH yields ~500kHz at moderate loads.
Can the LT1501IS8-3.3 be used to generate negative output voltages?
No, the LT1501IS8-3.3 cannot generate negative output voltages. It is a boost-only regulator with a grounded-emitter NPN switch and single FB/OUT pin. Negative regulation requires the LT1500 variant, which includes a dedicated NFB pin and supports Cuk/flyback topologies. The LT1501IS8-3.3 is strictly for positive step-up conversion.
LT1501IS8-3.3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- *
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Function:
- -
- Output Configuration:
- -
- Topology:
- -
- Output Type:
- -
- Number of Outputs:
- -
- Voltage - Input (Min):
- -
- Voltage - Input (Max):
- -
- Voltage - Output (Min/Fixed):
- -
- Voltage - Output (Max):
- -
- Current - Output:
- -
- Frequency - Switching:
- -
- Synchronous Rectifier:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LT1501IS8-3.3 FAQ
1.How can I place an order for LT1501IS8-3.3 through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1501IS8-3.3 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 LT1501IS8-3.3 reliable?
The price and inventory of LT1501IS8-3.3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1501IS8-3.3 is usually 5 days.
3.What payment methods are accepted for LT1501IS8-3.3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1501IS8-3.3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1501IS8-3.3?
LT1501IS8-3.3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1501IS8-3.3 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 LT1501IS8-3.3?
For technical support, including LT1501IS8-3.3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1501IS8-3.3 requirements.
6.How does Aetrix verify that LT1501IS8-3.3 is sourced from the original manufacturer or authorized distributors?
All LT1501IS8-3.3 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 LT1501IS8-3.3 meets industry standards.
7.What is the process for return or replacement of LT1501IS8-3.3?
All LT1501IS8-3.3 units undergo pre-shipment inspection (PSI). If there is an issue with LT1501IS8-3.3, 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 LT1501IS8-3.3 part is unused and in its original packaging.
Return procedure for LT1501IS8-3.3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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