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Analog Devices Inc. LT1529IT#06PBF
- Part No.:
- LT1529IT#06PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- TO-220-5
- Datasheet:
-
LT1529IT#06PBF.pdf
- Description:
- IC REG LIN POS ADJ 3A TO220-5
- Quantity:
- Payment:
- Shipping:
Inventory:148
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Product details
Overview
LT1529IT#06PBF from Analog Devices is an industrial-grade 3A low dropout linear regulator with micropower quiescent current (50µA), 0.6V dropout at 3A, reverse battery protection, and shutdown mode drawing only 16µA. It supports fixed 3.3V/5V outputs or adjustable operation from 3.75V to 14V, and is used in battery-powered systems, post-regulation of switching supplies, and 5V-to-3.3V logic conversion.
For engineers reviewing the LT1529IT#06PBF datasheet, LT1529IT#06PBF pinout, LT1529IT#06PBF application, or LT1529IT#06PBF equivalent, key selection criteria include dropout voltage at full load, reverse output current under backup-battery conditions, thermal performance in TO-220 packaging, and stability with 22µF ceramic output capacitors.
Technical Context
The LT1529IT#06PBF employs a PNP pass transistor architecture enabling true low-dropout operation while maintaining controlled quiescent current across dropout - unlike many legacy LDOs where IQ rises sharply in dropout. Its error amplifier uses Kelvin-sense capability via the SENSE pin (for fixed versions) or ADJ pin (for adjustable versions), referenced to a stable 3.75V internal bandgap.
Thermal protection is implemented via internal junction temperature limiting (TJMAX = 125°C), and reverse input protection allows ±15V input rating with <1mA reverse leakage. Shutdown is active-low on Pin 4 (SHDN), with threshold voltages of 0.25V (off-to-on) and 2.8V (on-to-off), compatible with direct 5V logic drive.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 3A continuous - supports high-current digital loads like microcontrollers and FPGAs without external boost circuitry. |
| Dropout Voltage | 0.6V at 3A - enables regulation from 3.9V input to 3.3V output, critical for single-cell Li-ion or multi-cell NiMH systems. |
| Quiescent Current | 50µA operating / 16µA shutdown - extends battery life in always-on IoT sensors and portable medical devices. |
| Output Capacitor | Stable with ≥22µF ceramic - eliminates need for bulky electrolytics, reduces board area and improves reliability. |
| Reverse Output Current | 16µA when VIN = 0V - prevents discharge of backup batteries during main supply failure, enabling seamless switchover. |
| Operating Temp Range | –45°C to +125°C - qualified for industrial motor drives, automotive body control modules, and outdoor telecom equipment. |
| Input Voltage Range | Up to 15V - accommodates 12V nominal systems with transient overvoltage tolerance. |
Pinout & Package
LT1529IT#06PBF is housed in a 5-lead plastic TO-220 package (T package) with the metal tab electrically connected to GND. Thermal resistance θJA ≈ 50°C/W in still air; mounting to a heatsink reduces θJC to 2.5°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: OUTPUT | Regulated power output | Delivers up to 3A; requires ≥22µF output capacitor for stability; Kelvin sensing possible via SENSE pin. |
| 2: SENSE / ADJ | Error amplifier input | Fixed versions (LT1529-3.3/LT1529-5): SENSE pin for remote feedback; adjustable version (LT1529): ADJ pin referenced to 3.75V. |
| 3: GND | Ground reference and thermal path | Common return for all currents; tab is GND - must be thermally coupled to PCB copper or heatsink. |
| 4: SHDN | Active-low shutdown control | Pull ≤0.25V to disable output; draws only 6µA when grounded; compatible with standard 5V CMOS logic. |
| 5: VIN | Main power input | Accepts up to 15V; reverse-voltage tolerant (–15V); bypass capacitor (1–10µF) recommended near pin. |
Key Features
| Feature | Design Value |
|---|---|
| No external protection diodes required | Integrated reverse-battery and reverse-output protection eliminate discrete diodes, saving BOM cost and PCB space. |
| Controlled quiescent current in dropout | IQ remains stable at 50µA even as VIN approaches VOUT - avoids system brownout during battery depletion. |
| Stable with small ceramic capacitors | 22µF minimum output capacitance enables use of X7R/X5R MLCCs instead of larger, less reliable tantalum or aluminum electrolytics. |
| Shutdown IQ = 16µA | Total system standby current drops to sub-20µA - meets stringent energy harvesting and ultra-low-power sensor node requirements. |
| Thermal limiting with safe shutdown | Internal foldback current limit and junction temperature cutoff prevent damage during sustained overload or poor heatsinking. |
Applications
| Portable Medical Monitor | Industrial PLC I/O Module |
|---|---|
Use Scenario: Battery-powered ECG front-end with real-time display and Bluetooth LE transmission. IC Role / Device Role / Timing Role: Primary 3.3V power rail regulator supplying MCU, analog front-end, and RF transceiver. Use Value: 50µA quiescent current extends 2000mAh Li-ion runtime beyond 30 days in sleep mode; 0.6V dropout enables full utilization of battery voltage down to 3.5V. | Use Scenario: DIN-rail mounted programmable logic controller with isolated digital inputs/outputs and 24V DC field power. IC Role / Device Role / Timing Role: Local 5V regulator for microcontroller and interface ICs, fed from 24V intermediate bus. Use Value: Reverse input protection withstands accidental 24V polarity reversal; thermal limiting prevents latch-up during short-circuit events on field wiring. |
| Automotive Body Control Unit | 5G Small Cell Remote Radio Head |
Use Scenario: Door module controlling window lift, mirror adjustment, and interior lighting in 12V vehicle architecture. IC Role / Device Role / Timing Role: Secondary 3.3V LDO for CAN transceiver and door MCU after primary buck converter. Use Value: –45°C to +125°C rating ensures operation in engine bay proximity; 16µA shutdown current meets OEM cold-soak battery drain limits. | Use Scenario: Outdoor mmWave radio head powered by PoE++ or 48V DC feed, requiring clean 3.3V for RFIC bias and FPGA configuration. IC Role / Device Role / Timing Role: Post-regulator cleaning ripple from switching supply before sensitive RF stages. Use Value: 62dB ripple rejection at 120Hz suppresses switching artifacts; 22µF ceramic stability simplifies layout in thermally constrained RF enclosure. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-dropout regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1529CT#06PBF | Commercial temperature range (0°C to 125°C) vs. industrial (–45°C to 125°C); identical electrical specs and pinout. | Suitable for non-automotive, non-industrial indoor electronics with ambient temperature control. | Select LT1529CT#06PBF only if operating environment stays above 0°C and lifecycle requirements do not demand industrial qualification. |
| TPS7A8300RGRT | Lower dropout (0.3V @ 3A), higher PSRR (70dB @ 1kHz), but requires 47µF minimum output cap and lacks reverse battery protection. | Better for noise-sensitive analog/RF rails where input voltage margin is tight and reverse protection is handled externally. | Choose TPS7A8300RGRT when ultra-low noise and tighter dropout outweigh need for integrated reverse protection and ceramic-cap simplicity. |
Compared with LT1529CT#06PBF, the LT1529IT#06PBF provides extended low-temperature operation essential for automotive and outdoor industrial use; compared with TPS7A8300RGRT, it trades some PSRR and dropout for robustness in fault conditions and reduced external component count.
Availability
LT1529IT#06PBF is available at Aetrix Electronics and suitable for battery-powered instrumentation, industrial control systems, and automotive body electronics requiring stable component supply with long-term manufacturability and guaranteed industrial temperature support.
Supply support for LT1529IT#06PBF 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. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision instrumentation, industrial automation, communications, and aerospace markets.
The LT1529 series was designed specifically for high-current, low-quiescent-power linear regulation in harsh environments - emphasizing reverse protection, thermal resilience, and compatibility with modern ceramic capacitors in space-constrained applications.
FAQ
What is the maximum input voltage rating for LT1529IT#06PBF?
The absolute maximum input voltage for LT1529IT#06PBF is ±15V. This includes tolerance for reverse battery connection or transient spikes in automotive and industrial 12V systems. Operation above 15V requires factory consultation per datasheet Note 1. The device blocks reverse current flow and limits reverse input leakage to <1mA, protecting both itself and downstream circuitry.
Does LT1529IT#06PBF require external diodes for reverse polarity protection?
No, LT1529IT#06PBF does not require external diodes for reverse polarity protection. It integrates reverse battery protection and zero reverse current flow from OUTPUT to VIN, even when VIN is reversed or grounded while OUTPUT is held high by a backup source. This eliminates the 0.3–0.7V forward drop and associated power loss of external Schottky diodes.
What output capacitor value and type are required for stable operation of LT1529IT#06PBF?
LT1529IT#06PBF is stable with a minimum 22µF ceramic capacitor (X7R or X5R) having ESR ≤0.2Ω. Unlike older LDOs requiring 100µF tantalum, this enables compact, high-reliability designs. Larger values improve transient response but are not required for stability. Aluminum or tantalum caps may be used but offer no advantage and increase size/cost.
How does the shutdown function operate on LT1529IT#06PBF?
LT1529IT#06PBF features an active-low SHDN pin (Pin 4). Pulling this pin ≤0.25V disables the output and reduces total supply current to 16µA. The pin is 5V logic-compatible and draws only 6µA when grounded. Leaving SHDN open leaves the device enabled. Internal clamping (–0.6V to 7V) protects against overvoltage and allows direct connection to microcontroller GPIO.
Is LT1529IT#06PBF pin-compatible with other variants in the LT1529 family?
Yes, LT1529IT#06PBF is pin-compatible with all LT1529 family members in the same TO-220 (T) or DD (Q) packages, including LT1529IT-3.3, LT1529IT-5, and LT1529CT variants. Pin 2 serves as SENSE for fixed-output versions and ADJ for the adjustable LT1529; all share identical VIN, GND, SHDN, and OUTPUT connections and thermal pad configuration.
LT1529IT#06PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- TO-220-5
- Packaging:
- Tube
- Product Status:
- Active
- Output Configuration:
- Positive
- Output Type:
- Adjustable
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 15V
- Voltage - Output (Min/Fixed):
- 3.75V
- Voltage - Output (Max):
- 14V
- Voltage Dropout (Max):
- 0.95V @ 3A
- Current - Output:
- 3A
- Current - Quiescent (Iq):
- 100 µA
- Current - Supply (Max):
- 160 mA
- PSRR:
- 62dB (120Hz)
- Control Features:
- Enable
- Protection Features:
- Over Current, Over Temperature, Reverse Polarity
- Operating Temperature:
- -45°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-220-5 Flow 6
LT1529IT#06PBF FAQ
1.How can I place an order for LT1529IT#06PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1529IT#06PBF 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 LT1529IT#06PBF reliable?
The price and inventory of LT1529IT#06PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1529IT#06PBF is usually 5 days.
3.What payment methods are accepted for LT1529IT#06PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1529IT#06PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1529IT#06PBF?
LT1529IT#06PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1529IT#06PBF 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 LT1529IT#06PBF?
For technical support, including LT1529IT#06PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1529IT#06PBF requirements.
6.How does Aetrix verify that LT1529IT#06PBF is sourced from the original manufacturer or authorized distributors?
All LT1529IT#06PBF 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 LT1529IT#06PBF meets industry standards.
7.What is the process for return or replacement of LT1529IT#06PBF?
All LT1529IT#06PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1529IT#06PBF, 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 LT1529IT#06PBF part is unused and in its original packaging.
Return procedure for LT1529IT#06PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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