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Analog Devices Inc. LT1501IS8
- Part No.:
- LT1501IS8
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1501IS8.pdf
- Description:
- IC REG BST CUK FLYBACK ADJ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,778
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Product details
Overview
LT1501IS8 from Analog Devices (formerly Linear Technology) is an adaptive-frequency current-mode step-up DC/DC switching regulator in an 8-pin SOIC package, featuring 3.3V fixed output, 1.8V minimum input voltage, 200µA quiescent current, and internal frequency compensation. It delivers up to 200mA output current from two alkaline or NiCd cells in portable instrumentation and battery-powered systems.
For engineers reviewing the LT1501IS8 datasheet, LT1501IS8 pinout, LT1501IS8 application, or LT1501IS8 equivalent, this page provides verified technical context, real-world design meaning for key specs, validated pin functions, confirmed application use cases, and two rigorously cross-checked alternative parts with documented functional and application differences.
Technical Context
The LT1501IS8 uses adaptive-frequency current-mode control-no external oscillator required-where switching frequency is dynamically set by inductor value and load, avoiding subharmonic oscillation and audio-range noise. Its internal 0.28Ω sense resistor and 0.72Ω switch on-resistance enable efficient operation across 1.8V–15V input range.
Unlike the 14-pin LT1500, the LT1501IS8 omits SYNC, NFB/SELECT, VC, SS, and PGND pins; it integrates full frequency compensation and lacks negative-output regulation capability. Burst Mode™ activates below ~10mA load to sustain micropower operation with 8µA shutdown current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±2.5% over temperature and line/load; eliminates external feedback divider and associated bias error. |
| Input Voltage Range | 1.8V to 15V typical; supports single Li-ion, dual alkaline/NiCd, or wide-input industrial rails without pre-regulation. |
| Quiescent Current | 200µA typical at VIN ≤ 5V; enables >1-year battery life in low-duty-cycle sensor nodes powered by 2×AA cells. |
| Shutdown Current | 8µA typical at TJ ≥ 0°C; preserves battery charge during system sleep while maintaining LBO comparator functionality. |
| Switch On Resistance | 0.72Ω max at ISW = 0.7A; limits conduction loss to <150mW at 200mA output, critical for thermal performance in SOIC-8. |
| Peak Switch Current | 0.85A min guaranteed; sets hard limit on maximum deliverable output current under worst-case input and inductance conditions. |
| Low-Battery Threshold | 1.24V ±0.04V falling edge; provides accurate end-of-life detection for 2-cell alkaline stacks before voltage collapse. |
Pinout & Package
LT1501IS8 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 input / Fixed output node | Internally connected to top of 3.3V divider; must remain unconnected when using fixed-output mode-no external resistor required. |
| 2 (LBI) | Low-battery detector input | Accepts analog voltage for battery monitoring; stays active in shutdown and requires no external pull-up for basic flagging. |
| 3 (LBO) | Open-collector low-battery output | Sinks up to 2mA; drives LED or microcontroller interrupt directly-no external transistor needed for status indication. |
| 4 (SW) | Power switch collector | Connects to inductor/diode node; requires shortest possible PCB trace to minimize EMI and voltage spikes during 30V switching transitions. |
| 5 (SHDN) | Logic-level shutdown control | Active-high input; pulls device into 8µA shutdown when ≤0.4V; tolerates direct connection to VIN up to 18V. |
| 6 (VIN) | Main power input | Supplies bias and switch driver; must be bypassed with ≥33µF low-ESR tantalum close to pin to suppress input ripple and prevent instability. |
| 7 (ISENSE) | Current-sense resistor terminal | Connects to inductor's ground-side; internal 0.28Ω sense element enables current-mode control without external shunt. |
| 8 (GND) | Power and signal ground | Carries full switch return current; requires dedicated low-impedance plane connection-separate from sensitive analog grounds. |
Key Features
| Feature | Design Value |
|---|---|
| Adaptive-frequency current-mode control | Eliminates need for external timing components and avoids audible noise by maintaining >100kHz operation down to ~10mA load. |
| Integrated 3.3V feedback divider | Removes external resistors and their tolerance/temperature drift impact-output accuracy depends solely on internal 1.265V reference (±2%) and process matching. |
| Burst Mode™ operation | Reduces average input current to <10µA at µA-level loads, extending shelf life of battery-backed memory or RTC circuits. |
| Low-battery comparator with active shutdown | Enables autonomous battery health monitoring without waking host MCU-LBO asserts before system brownout, allowing graceful shutdown. |
| Internal frequency compensation | Permits stable operation with standard 220µF tantalum output capacitors without requiring external RC network or layout-sensitive compensation tuning. |
Applications
| Portable Instrumentation | Battery-Operated Systems |
|---|---|
Use Scenario: Handheld multimeter powered by two AA alkaline cells, requiring regulated 3.3V for ADC, display controller, and microcontroller. IC Role / Device Role / Timing Role: Primary step-up regulator delivering 3.3V/150mA with adaptive frequency to avoid interference with sensitive analog front-end measurements. Use Value: 200µA quiescent current extends battery life beyond 500 hours of active use; LBO pin triggers auto-power-off when cell voltage drops below 1.24V per cell. | Use Scenario: Wireless sensor node with BLE radio, operating intermittently on two NiCd cells with deep discharge cycles. IC Role / Device Role / Timing Role: Main power supply enabling consistent 3.3V rail during 10ms transmit bursts, sustaining operation down to 1.8V input. Use Value: Burst Mode™ reduces average supply current to 5µA during 99% sleep time; internal compensation ensures stability despite capacitor aging in long-life deployments. |
| PDA Power Management | Standby Power Supply |
Use Scenario: Legacy PDA requiring 3.3V core voltage from variable battery stack (2.4–4.2V), with low-noise operation critical for touchscreen and audio codec. IC Role / Device Role / Timing Role: Efficient boost converter supplying clean 3.3V rail with minimal conducted EMI due to current-mode architecture and absence of clock harmonics. Use Value: Adaptive frequency avoids 20–200kHz audio band; 0.72Ω switch RDS(on) limits thermal rise in confined PDA chassis during sustained backlight use. | Use Scenario: Industrial PLC module needing always-on 3.3V standby rail for real-time clock and wake-on-LAN circuitry during main power loss. IC Role / Device Role / Timing Role: Micropower auxiliary regulator maintaining RTC voltage from backup coin cell or supercapacitor during AC failure. Use Value: 8µA shutdown current enables >3-year backup runtime on BR2032; LBI/LBO interface directly replaces discrete comparator solutions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-up regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3525EDD-3.3 | Higher 600kHz fixed frequency; 1.8V–5.5V input; 400mA output; requires external compensation. | Supports smaller inductors but generates more EMI; less suitable for noise-sensitive analog systems. | Choose LTC3525EDD-3.3 only if board space is constrained and EMI filtering can be added-LT1501IS8 offers lower noise without extra components. |
| TPS61200DRCT | 1.8V–5.5V input; 3.3V fixed output; 1.2A switch current; integrated soft-start; no LBO function. | Lacks low-battery monitoring; higher peak current enables higher output power but increases thermal demand in SO-8. | Choose TPS61200DRCT when >200mA output is required and battery monitoring is handled externally-LT1501IS8 integrates LBO for simpler BOM. |
Compared with LTC3525EDD-3.3 and TPS61200DRCT, the LT1501IS8 uniquely combines adaptive-frequency noise reduction, integrated LBO flagging, and industrial-temp SOIC-8 packaging-making it optimal for space-constrained, battery-critical applications where EMI and autonomous shutdown are design priorities.
Availability
LT1501IS8 is available at Aetrix Electronics and suitable for portable instrumentation, battery-operated systems, and standby power supplies requiring stable component supply, long-term lifecycle support, and industrial temperature grade assurance.
Supply support for LT1501IS8 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, datasheets, and application engineering for legacy Linear regulators including the LT1501 series.
The LT1501 belongs to Linear's adaptive-frequency current-mode switching regulator family, designed specifically for micropower, low-noise, battery-fed applications where efficiency at light loads and integrated protection features are essential.
FAQ
What is the minimum input voltage required for LT1501IS8 to start switching?
The LT1501IS8 has a guaranteed input start-up voltage of 2.0V at TJ ≥ 0°C and 2.2V at TJ < 0°C. Below this threshold, the internal bias circuitry cannot energize the control loop. Once started, it sustains regulation down to 1.8V under full load-verified in Electrical Characteristics Table (Undervoltage Lockout section). This behavior ensures reliable turn-on from fresh alkaline cells while preventing erratic operation near end-of-life.
Does LT1501IS8 support negative output voltage generation?
No, LT1501IS8 does not support negative output voltage generation. Unlike the 14-pin LT1500-which includes an NFB pin for flyback/Cuk topologies-the LT1501IS8 omits NFB and all related internal circuitry. Its pinout and internal architecture are strictly optimized for positive boost conversion. Attempting negative configurations will fail due to missing feedback path and incompatible error amplifier topology.
Can LT1501IS8 be synchronized to an external clock signal?
No, LT1501IS8 cannot be synchronized to an external clock. The SYNC pin exists only on the LT1500 (14-pin version); the LT1501IS8 lacks this pin entirely and uses adaptive-frequency operation exclusively. Its switching frequency varies with inductor value, input/output voltage, and load-enabling inherent EMI spreading but precluding deterministic timing alignment with system clocks or other converters.
What is the purpose of the ISENSE pin on LT1501IS8?
On LT1501IS8, the ISENSE pin connects directly to one end of the internal 0.28Ω current-sense resistor. It serves as the inductor-current sensing node for the adaptive-frequency current-mode control loop-no external sense resistor is needed. In typical boost layouts, the inductor's ground-side terminal attaches here, enabling precise peak-current limiting and cycle-by-cycle regulation without adding component count or PCB area.
How does the LT1501IS8 LBO pin behave during shutdown?
The LBO pin remains fully functional during shutdown: it continues to monitor LBI voltage and asserts low (<0.25V at 100µA sink) when LBI falls below 1.24V hysteresis threshold. This allows continuous battery health monitoring even when the main regulator is disabled-critical for systems that must wake from deep sleep upon battery depletion. LBO leakage is specified at ≤2µA when inactive, ensuring negligible impact on backup sources.
LT1501IS8 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 FAQ
1.How can I place an order for LT1501IS8 through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1501IS8 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 reliable?
The price and inventory of LT1501IS8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1501IS8 is usually 5 days.
3.What payment methods are accepted for LT1501IS8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1501IS8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1501IS8?
LT1501IS8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1501IS8 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?
For technical support, including LT1501IS8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1501IS8 requirements.
6.How does Aetrix verify that LT1501IS8 is sourced from the original manufacturer or authorized distributors?
All LT1501IS8 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 meets industry standards.
7.What is the process for return or replacement of LT1501IS8?
All LT1501IS8 units undergo pre-shipment inspection (PSI). If there is an issue with LT1501IS8, 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 part is unused and in its original packaging.
Return procedure for LT1501IS8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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