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Analog Devices Inc. LT1764ET-1.5#PBF
- Part No.:
- LT1764ET-1.5#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- TO-220-5
- Datasheet:
-
LT1764ET-1.5#PBF.pdf
- Description:
- IC REG LINEAR 1.5V 3A TO220-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,016
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Product details
Overview
LT1764ET-1.5#PBF from Analog Devices (formerly Linear Technology) is a 3A, low-noise, fast-transient-response LDO regulator with fixed 1.5V output, 340mV dropout at 3A, 40µVRMS noise (10Hz–100kHz), and stable operation with only 10µF output capacitance. It delivers precision power for RF analog circuits, FPGA core supplies, and post-regulation of switching converters.
For engineers reviewing the LT1764ET-1.5#PBF datasheet, LT1764ET-1.5#PBF pinout, LT1764ET-1.5#PBF application, or LT1764ET-1.5#PBF equivalent, key selection criteria include guaranteed dropout voltage under full load, controlled quiescent current in dropout, reverse battery protection, thermal limiting, and compatibility with low-ESR ceramic or tantalum output capacitors.
Technical Context
The LT1764ET-1.5#PBF uses a proprietary fast-transient-response control architecture that minimizes output voltage deviation during rapid load steps-critical for powering sensitive RF ICs and high-speed digital cores. Its error amplifier features Kelvin-sense capability via the SENSE pin, enabling accurate regulation at the load despite PCB trace resistance.
Internally, it integrates reverse-battery protection, no-reverse-current operation, thermal shutdown, and current limiting. Quiescent current remains tightly regulated at 1mA across load and input conditions-not increasing in dropout-unlike conventional LDOs. Shutdown draws <1µA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.5V ±2.3% over –40°C to 110°C, 1mA–3A load; enables direct powering of 1.5V logic and DDR memory termination. |
| Max Output Current | 3A continuous; supports high-current FPGA I/O banks and ASIC core rails without external pass devices. |
| Dropout Voltage | 340mV at 3A and 25°C; allows operation from 1.85V input at full load-ideal for single-cell Li-ion or post-buck applications. |
| Output Noise | 40µVRMS (10Hz–100kHz); meets stringent RF supply requirements for LNAs, mixers, and PLL VCOs. |
| Quiescent Current | 1mA typical at full load; drops to <1µA in shutdown-enables ultra-low-power standby modes in portable systems. |
| Stability | Stable with ≥10µF output capacitor (50mΩ–3Ω ESR); eliminates need for large, costly bulk capacitors in space-constrained designs. |
| Input Range | 2.7V to 20V; accommodates wide-input industrial supplies, automotive transients, and multi-rail DC/DC outputs. |
Pinout & Package
LT1764ET-1.5#PBF is housed in a 5-lead TO-220 package with exposed tab connected to GND for thermal performance. Pin 1 = SHDN, Pin 2 = IN, Pin 3 = GND, Pin 4 = OUT, Pin 5 = SENSE (tied internally to OUT for fixed-output variants).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SHDN (Pin 1) | Shutdown control input | Active-low logic interface; pulls output off when ≤0.75V; requires pull-up to VIN if unused-enables system-level power sequencing. |
| IN (Pin 2) | Main power input | Accepts 2.7V–20V; reverse-battery protected-no external diode needed even with hot-swap or battery-reversal risk. |
| GND (Pin 3) | Power ground reference | Common return for IN, OUT, and internal circuitry; tab is electrically connected and must be soldered for θJA = 30°C/W thermal rating. |
| OUT (Pin 4) | Regulated output | Delivers 1.5V at up to 3A; requires ≥10µF output capacitor; low-impedance path critical for transient response. |
| SENSE (Pin 5) | Kelvin sense input | Connected to OUT pin internally for fixed versions; enables remote sensing at load to cancel PCB IR drop-improves regulation accuracy by up to 25mV. |
Key Features
| Feature | Design Value |
|---|---|
| Fast transient response | Minimizes output voltage deviation during 1mA→3A load steps-critical for powering burst-mode RF transceivers and CPU cores. |
| No protection diodes required | Integrated reverse-battery and reverse-current protection eliminate external diodes-reducing BOM count and board area by 2–3 components. |
| Controlled quiescent current in dropout | IQ remains ~1mA even when VIN approaches VOUT-prevents thermal runaway and ensures predictable power budgeting in brownout conditions. |
| Stable with 10µF output capacitor | Enables use of compact, low-profile ceramic or polymer capacitors instead of bulky electrolytics-reducing footprint by >50% vs legacy LDOs. |
| Thermal limiting with safe operating area | Gradually reduces current limit as (VIN–VOUT) increases-protects die during high-differential-voltage startup or overload without latch-off. |
Applications
| RF Power Amplifier Bias Supply | FPGA Core Voltage Regulation |
|---|---|
Use Scenario: Providing clean, low-noise bias to GaAs or GaN RF power amplifiers in cellular base stations and mmWave radios. IC Role / Device Role / Timing Role: Primary 1.5V LDO delivering stable bias under dynamic RF envelope modulation. Use Value: 40µVRMS noise prevents AM-to-PM distortion; fast transient response maintains PA linearity during burst transmission. | Use Scenario: Supplying configurable logic block (CLB) core voltage for Xilinx Artix-7 or Intel Cyclone V FPGAs. IC Role / Device Role / Timing Role: High-current, low-dropout post-regulator following a buck converter. Use Value: 340mV dropout enables operation from 1.85V input-maximizing efficiency while meeting FPGA's tight 1.5V ±3% tolerance. |
| Industrial PLC I/O Module Supply | Battery-Powered Medical Sensor Node |
Use Scenario: Powering isolated analog front-end (AFE) and digital isolator circuits in programmable logic controller modules. IC Role / Device Role / Timing Role: Primary 1.5V rail generator with reverse-input protection for 24V field wiring environments. Use Value: Reverse-battery protection prevents damage during field wiring errors; thermal limiting ensures reliability in sealed enclosures. | Use Scenario: Supplying ultra-low-noise power to ADCs, op-amps, and BLE SoCs in wearable ECG monitors. IC Role / Device Role / Timing Role: Main system LDO with shutdown control synchronized to sensor sampling intervals. Use Value: <1µA shutdown current extends coin-cell life beyond 5 years; 10µF stability enables miniaturized PCB layout. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS7A8300RGRT | Lower noise (4.5µVRMS), but 2A max output and requires ≥22µF ceramic output cap; no reverse-battery protection. | Better for ultra-low-noise analog signal chains; unsuitable for 3A loads or harsh-wiring environments. | Select when noise is paramount and load ≤2A; verify reverse-protection via external circuitry. |
| MCP1826T-1502E/OT | 3A rated, 1.5V fixed, but 500mV dropout at 3A and 65µVRMS noise; no SENSE pin or reverse-battery protection. | Cost-optimized for non-critical industrial supplies; lacks RF-grade noise performance and robustness. | Select for cost-sensitive, non-RF applications where 340mV dropout and 40µVRMS are not required. |
Compared with TPS7A8300RGRT and MCP1826T-1502E/OT, the LT1764ET-1.5#PBF uniquely combines 3A capability, 340mV dropout, 40µVRMS noise, reverse-battery protection, and Kelvin sensing-making it the only choice for high-reliability, high-performance 1.5V LDO applications demanding both current and cleanliness.
Availability
LT1764ET-1.5#PBF is available at Aetrix Electronics and suitable for RF power amplifier biasing, FPGA core regulation, and industrial PLC I/O module power supplies requiring stable component supply across long production lifecycles.
Supply support for LT1764ET-1.5#PBF 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 LT1764 series was designed specifically for high-current, low-noise, fast-transient LDO applications in RF infrastructure, test equipment, and precision instrumentation-emphasizing robustness, accuracy, and ease of use without external protection components.
FAQ
What is the maximum input voltage rating for the LT1764ET-1.5#PBF?
The LT1764ET-1.5#PBF has an absolute maximum input voltage of ±20V on the IN pin. However, the functional input operating range is 2.7V to 20V. Exceeding 20V risks permanent damage, and operation below 2.7V may fail to maintain regulation at full 3A load due to minimum input voltage constraints specified per output current and temperature.
Does the LT1764ET-1.5#PBF require an external diode for reverse-battery protection?
No, the LT1764ET-1.5#PBF includes integrated reverse-battery protection. When VIN is reversed (e.g., –20V), the device blocks reverse current flow and prevents damage to itself and downstream circuitry-eliminating the need for an external series diode and its associated voltage drop and power loss.
Can the LT1764ET-1.5#PBF operate stably with ceramic output capacitors?
Yes, the LT1764ET-1.5#PBF is stable with ceramic output capacitors ≥10µF, provided their ESR falls within 50mΩ to 3Ω. X5R or X7R dielectrics are recommended for stable capacitance across voltage and temperature; Y5V or Z5U types should be avoided due to excessive DC bias derating.
What is the purpose of the SENSE pin on the LT1764ET-1.5#PBF?
The SENSE pin on the LT1764ET-1.5#PBF enables Kelvin (remote) sensing of the output voltage at the load. For fixed-output versions like the LT1764ET-1.5#PBF, it is internally tied to OUT but can be externally connected to the load point to compensate for PCB trace voltage drop-improving regulation accuracy by up to 25mV under high-current conditions.
How does quiescent current behave in dropout for the LT1764ET-1.5#PBF?
Unlike many LDOs, the LT1764ET-1.5#PBF maintains tightly controlled quiescent current (~1mA) even when operating in dropout (VIN ≈ VOUT). This prevents thermal runaway and ensures predictable power consumption during brownout or low-input conditions-critical for battery-powered systems where IQ stability directly impacts runtime.
LT1764ET-1.5#PBF 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:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 20V
- Voltage - Output (Min/Fixed):
- 1.5V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.66V @ 3A
- Current - Output:
- 3A
- Current - Quiescent (Iq):
- 1.5 mA
- Current - Supply (Max):
- 200 mA
- PSRR:
- 63dB (120Hz)
- Control Features:
- Enable
- Protection Features:
- Over Current, Over Temperature, Reverse Polarity
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-220-5
LT1764ET-1.5#PBF FAQ
1.How can I place an order for LT1764ET-1.5#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1764ET-1.5#PBF 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 LT1764ET-1.5#PBF reliable?
The price and inventory of LT1764ET-1.5#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1764ET-1.5#PBF is usually 5 days.
3.What payment methods are accepted for LT1764ET-1.5#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1764ET-1.5#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1764ET-1.5#PBF?
LT1764ET-1.5#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1764ET-1.5#PBF 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 LT1764ET-1.5#PBF?
For technical support, including LT1764ET-1.5#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1764ET-1.5#PBF requirements.
6.How does Aetrix verify that LT1764ET-1.5#PBF is sourced from the original manufacturer or authorized distributors?
All LT1764ET-1.5#PBF 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 LT1764ET-1.5#PBF meets industry standards.
7.What is the process for return or replacement of LT1764ET-1.5#PBF?
All LT1764ET-1.5#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1764ET-1.5#PBF, 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 LT1764ET-1.5#PBF part is unused and in its original packaging.
Return procedure for LT1764ET-1.5#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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