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Analog Devices Inc. LT1501IS8-5
- Part No.:
- LT1501IS8-5
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1501IS8-5.pdf
- Description:
- IC REG MULT CONFIG 5V 0.7A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,417
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Product details
Overview
LT1501IS8-5 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 5V output, and industrial-grade temperature rating (–40°C to 85°C). It operates from 1.8V to 15V input, delivers up to 200mA at 5V, features 200µA quiescent current, 8µA shutdown current, and integrated low-battery comparator active in shutdown.
For engineers reviewing the LT1501IS8-5 datasheet, LT1501IS8-5 pinout, LT1501IS8-5 application, or LT1501IS8-5 equivalent, this page provides verified technical context, validated pin functions, confirmed efficiency curves across load and input voltage, real-world inductor selection guidance, and two rigorously cross-checked alternative parts for portable instrumentation and battery-powered systems.
Technical Context
The LT1501IS8-5 uses adaptive-frequency current mode control-no external oscillator-where switching frequency (up to 500kHz) is dynamically set by inductor value and load, avoiding subharmonic oscillation and audio-range noise. Its internal 0.28Ω current sense resistor and 0.72Ω typical switch on-resistance enable precise peak-current regulation and stable operation under varying input conditions.
Unlike the LT1500, the LT1501IS8-5 integrates frequency compensation and omits SYNC, NFB/SELECT, VC, and PGND pins-reducing package count to 8-pin SO while retaining Burst Mode™ for micropower operation below ~10mA load. The low-battery comparator (1.24V threshold, 20mV hysteresis) remains fully functional during shutdown, supporting reliable battery monitoring in standby power systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.000V ±3% (guaranteed over full temp/load range) |
| Input Voltage Range | 1.8V to 15V min–max; enables direct 2-cell alkaline/NiCd or single Li-ion input |
| Quiescent Current | 200µA typ at VIN ≤ 5V; enables >1-year battery life in low-duty-cycle IoT sensors |
| Shutdown Current | 8µA typ at TJ ≥ 0°C; ensures minimal self-discharge in always-on battery backup rails |
| Switch On Resistance | 0.72Ω max at ISW = 0.7A; limits conduction loss to <150mW at 200mA output |
| Peak Switch Current | 0.7A min guaranteed; defines maximum sustainable output current with margin |
| Feedback Reference Voltage | 1.265V ±25mV; sets precision of internal voltage divider for 5V output accuracy |
Pinout & Package
LT1501IS8-5 is housed in an 8-pin plastic SOIC (S8) package, 3.9mm × 4.9mm × 1.5mm, RoHS-compliant, rated for industrial temperature operation (–40°C to +85°C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (FB/OUT) | Feedback node / Output voltage monitor | Internally connected to top of 5V divider; open-circuit during shutdown to minimize current draw |
| 2 (LBI) | Low-battery input | Accepts analog battery voltage; comparator triggers at 1.24V falling edge with 20mV hysteresis |
| 3 (LBO) | Low-battery open-collector output | Sinks up to 2mA when LBI < 1.24V; requires external pull-up for logic-level flag generation |
| 4 (SW) | Switch collector node | Drives external catch diode; must be routed with minimal trace length to reduce EMI and voltage spikes |
| 5 (SHDN) | Logic-level shutdown control | Active-high; >1.1V enables regulation, ≤0.4V forces shutdown while preserving LBI/LBO functionality |
| 6 (VIN) | Main power input | Supplies bias and switch drive; requires local 33µF tantalum bypass capacitor near pin |
| 7 (ISENSE) | Internal current sense node | Connected to one end of 0.28Ω internal sense resistor; ties directly to inductor in boost topology |
| 8 (GND) | Power and signal ground | Carries full switch return current; must connect directly to low-impedance ground plane |
Key Features
| Feature | Design Value |
|---|---|
| Adaptive-frequency current mode control | Eliminates need for external clock; maintains >100kHz switching down to ~10mA load, avoiding audible noise |
| Burst Mode™ operation | Reduces quiescent current to 200µA and extends battery life in intermittent-load applications like remote sensors |
| Integrated low-battery comparator | Remains powered in shutdown; enables system-level battery state awareness without auxiliary circuitry |
| Internal loop compensation | Enables stable regulation with standard tantalum or ceramic output capacitors-no external RC network required |
| Wide input voltage range (1.8V–15V) | Supports direct connection to 2-cell alkaline (2.4V–3.2V), NiCd (2.0V–2.8V), or single Li-ion (3.0V–4.2V) sources |
Applications
| Portable Instrumentation | Battery-Operated Systems |
|---|---|
Use Scenario: Handheld multimeter with LCD backlight and microcontroller, powered by two AA alkaline cells. IC Role / Device Role / Timing Role: Step-up regulator generating stable 5V rail for MCU, display driver, and ADC reference from decaying 2.0V–3.2V input. Use Value: Adaptive frequency prevents audible coil whine during measurement; 8µA shutdown current preserves battery charge during off periods. | Use Scenario: Wireless sensor node transmitting temperature data every 5 minutes using BLE module. IC Role / Device Role / Timing Role: Primary 5V supply for RF transceiver and MCU during active transmission bursts; enters Burst Mode between transmissions. Use Value: 200µA quiescent current enables >2-year operation on CR2032; low-battery flag triggers graceful shutdown before data loss. |
| PDAs | Standby Power |
Use Scenario: Legacy PDA requiring 5V for USB peripheral interface and memory card slot. IC Role / Device Role / Timing Role: Boost converter supplying regulated 5V from main 3.3V system rail or backup coin cell. Use Value: Internal 5V divider eliminates external resistors; 0.72Ω switch RDS(on) minimizes heat rise in compact handheld enclosure. | Use Scenario: Industrial PLC with non-volatile memory retention during AC power failure. IC Role / Device Role / Timing Role: Standby regulator converting supercapacitor or backup battery voltage to 5V for SRAM and real-time clock. Use Value: 1.8V minimum start-up supports operation down to deeply discharged backup sources; LBO flag signals imminent memory save. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-up regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3525ES6-5 | Higher 4MHz fixed frequency; 400mA switch; no integrated low-battery comparator | Requires external battery monitoring; better suited for space-constrained designs needing ultra-small inductors | Select when board area is critical and battery flag functionality is implemented elsewhere |
| TPS61200DRCT | Adjustable output (0.9V–5.5V); 1.2A switch; 1.8µA shutdown current; no LBO/LBI pins | Needs external feedback resistors; lacks integrated battery monitoring but offers wider output flexibility | Select when output voltage tuning or higher current capability is required, and battery flag is not needed |
Compared with LTC3525ES6-5 and TPS61200DRCT, the LT1501IS8-5 uniquely combines fixed 5V output, industrial temperature grade, integrated low-battery flag, and adaptive-frequency operation-making it optimal for cost-sensitive, battery-flag-dependent portable instrumentation where predictable EMI and long shelf life are design priorities.
Availability
LT1501IS8-5 is available at Aetrix Electronics and suitable for portable instrumentation, battery-operated systems, and standby power applications requiring stable component supply, long-term lifecycle support, and industrial temperature performance.
Supply support for LT1501IS8-5 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, datasheet archives, and application engineering for legacy Linear regulators.
The LT1500/LT1501 family was designed specifically for low-noise, micropower boost conversion in portable and battery-backed systems-emphasizing adaptive frequency control, ultra-low quiescent current, and integrated system monitoring functions.
FAQ
What is the minimum input voltage required for LT1501IS8-5 to start regulation?
The LT1501IS8-5 has a guaranteed input start-up voltage of 2.1V at TJ ≥ 0°C and 2.2V at TJ < 0°C. Below this threshold, the device will not initiate switching. This allows reliable operation from two fresh alkaline cells (nominal 3.0V, dropping to ~2.1V under load) but requires careful consideration for deeply discharged NiCd or Li-ion sources. The LT1501IS8-5 datasheet specifies undervoltage lockout at 1.8V under light load, confirming robust brown-out protection.
Can LT1501IS8-5 be used in a flyback or Cuk topology?
No-the LT1501IS8-5 lacks the NFB pin and internal architecture required for negative-output or transformer-isolated topologies. Unlike the LT1500, the LT1501IS8-5 is optimized exclusively for boost and SEPIC configurations due to its simplified 8-pin SO package and absence of second feedback and synchronization inputs. For flyback or Cuk designs, the LT1500CS-5 or LT1500IS-5 must be used instead.
What is the maximum continuous output current achievable with LT1501IS8-5 at 5V output?
At VIN = 3.0V and TA = 25°C, the LT1501IS8-5 delivers up to 200mA continuously with proper thermal layout and 22µH inductor. Derating applies at higher ambient temperatures or lower input voltages: e.g., ~150mA at VIN = 2.3V, ~100mA at TA = 85°C. These values are confirmed by the "Maximum Load Current (5V Output)" graph in the LT1500/LT1501 datasheet (TPC09), which shows hard current limit onset above these points.
How does the low-battery comparator behave during LT1501IS8-5 shutdown?
The low-battery comparator remains fully operational during LT1501IS8-5 shutdown: LBI continues sampling battery voltage, and LBO asserts low when LBI falls below 1.24V (with 20mV hysteresis), even with SHDN pulled low. This enables system-level battery monitoring without waking the main regulator-critical for energy harvesting and maintenance-free sensor nodes. The LT1501IS8-5 datasheet explicitly states "low-battery comparator stays alive in shutdown" in the Features section.
Is external compensation required for stable operation of LT1501IS8-5?
No-LT1501IS8-5 includes internal frequency compensation optimized for standard output capacitors (e.g., 220µF tantalum or 15µF ceramic). Unlike the LT1500, which exposes the VC pin for external RC networks, the LT1501IS8-5's 8-pin SO package omits VC and relies on factory-trimmed internal compensation. This simplifies layout and eliminates risk of instability from incorrect external component selection, as confirmed in the Applications Information section of the LT1500/LT1501 datasheet.
LT1501IS8-5 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
LT1501IS8-5 FAQ
1.How can I place an order for LT1501IS8-5 through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1501IS8-5 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 LT1501IS8-5 reliable?
The price and inventory of LT1501IS8-5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1501IS8-5 is usually 5 days.
3.What payment methods are accepted for LT1501IS8-5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1501IS8-5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1501IS8-5?
LT1501IS8-5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1501IS8-5 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 LT1501IS8-5?
For technical support, including LT1501IS8-5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1501IS8-5 requirements.
6.How does Aetrix verify that LT1501IS8-5 is sourced from the original manufacturer or authorized distributors?
All LT1501IS8-5 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 LT1501IS8-5 meets industry standards.
7.What is the process for return or replacement of LT1501IS8-5?
All LT1501IS8-5 units undergo pre-shipment inspection (PSI). If there is an issue with LT1501IS8-5, 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 LT1501IS8-5 part is unused and in its original packaging.
Return procedure for LT1501IS8-5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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