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Analog Devices Inc. LT1963ET#30PBF
- Part No.:
- LT1963ET#30PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- TO-220-5 Formed Leads
- Datasheet:
-
LT1963ET#30PBF.pdf
- Description:
- IC REG LIN POS ADJ 1.5A TO220-5
- Quantity:
- Payment:
- Shipping:
Inventory:148
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Product details
Overview
LT1963ET#30PBF from Analog Devices (formerly Linear Technology) is a 1.5A, low-noise, fast-transient-response LDO regulator in TO-220-5 package with fixed 3.3V output. It delivers 1.5A at 340mV dropout, maintains 40µVRMS noise (10Hz–100kHz), draws 1mA quiescent current, and remains stable with only 10µF output capacitance - ideal for RF power supply post-regulation in baseband processors and wireless transceivers.
For engineers reviewing the LT1963ET#30PBF datasheet, LT1963ET#30PBF pinout, LT1963ET#30PBF application, or LT1963ET#30PBF equivalent, key selection criteria include guaranteed 3.3V ±1.5% output accuracy over load/temperature, controlled quiescent current in dropout, reverse battery protection, no external diodes required, and compatibility with ceramic and tantalum output capacitors down to 10µF.
Technical Context
The LT1963ET#30PBF uses a PNP pass transistor architecture enabling low dropout and fast transient response via optimized error amplifier compensation. Its SENSE pin enables Kelvin sensing for precision regulation at the load, while internal reverse-battery protection eliminates need for external input diodes.
Quiescent current remains tightly regulated across operating conditions - staying near 1mA under full load and dropping below 1µA in shutdown - and GND pin current scales predictably with load (80–120mA at 1.5A), supporting accurate thermal modeling in high-power applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±1.5% (2.412V–3.400V over temp/load) |
| Max Output Current | 1.5A continuous - supports high-current digital logic rails and RF PA biasing |
| Dropout Voltage | 340mV at 1.5A - enables operation from 3.64V input when regulating 3.3V |
| Output Noise | 40µVRMS (10Hz–100kHz) - suitable for noise-sensitive RF ICs and ADC references |
| Quiescent Current | 1mA active / <1µA shutdown - extends battery life in portable systems |
| Stability | Stable with ≥10µF output capacitor (ESR 50mΩ–3Ω) - simplifies layout vs. older LDOs requiring 47µF+ |
| Protection | Reverse battery, thermal limit, current limit (1.6A min), no reverse current - reduces BOM count |
Pinout & Package
LT1963ET#30PBF is housed in a 5-lead TO-220 package with exposed tab electrically connected to GND. The tab must be soldered to PCB copper for thermal performance (θJA = 30°C/W). Pin 1 = IN, Pin 2 = GND, Pin 3 = OUT, Pin 4 = SHDN, Pin 5 = SENSE.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (IN) | Input power supply connection | Accepts 3.64V–20V input; withstands −20V reverse voltage; bypass cap recommended if >6" from source |
| 2 (GND) | Ground reference and thermal path | Common return for IN, OUT, SHDN, SENSE; tab is GND - must be soldered for rated θJA |
| 3 (OUT) | Regulated 3.3V output | Supplies up to 1.5A; requires ≥10µF output capacitor; supports Kelvin sense via Pin 5 |
| 4 (SHDN) | Active-low shutdown control | Pull ≤0.75V to disable output; draws ≤30µA at 20V; open or tied to VIN enables operation |
| 5 (SENSE) | Kelvin feedback for output voltage sensing | Connects to load-side of trace for precision regulation; bias current = 600µA at VOUT |
Key Features
| Feature | Design Value |
|---|---|
| Fast transient response | Minimizes output voltage deviation during sudden load steps (e.g., CPU burst mode) without external compensation |
| No protection diodes needed | Integrated reverse-battery protection eliminates external series diode - saves space, avoids 0.3–0.7V drop |
| Controlled quiescent current in dropout | IQ stays ~1mA even as VIN approaches VOUT - avoids thermal runaway and enables predictable thermal design |
| Stable with 10µF output capacitor | Reduces required board area vs. legacy LDOs needing 47–100µF; compatible with low-ESR ceramics and tantalums |
| Reverse current blocking | Prevents backfeed from output to input when VIN = 0V - critical for battery backup and hot-swap systems |
Applications
| Baseband Processor Power | RF Transceiver Bias Rail |
|---|---|
Use Scenario: Supplying core voltage to LTE/5G baseband SoCs with dynamic current draw up to 1.2A. IC Role / Device Role / Timing Role: Primary 3.3V LDO delivering clean, low-noise power to processor I/O and memory interfaces. Use Value: 40µVRMS noise and fast transient response prevent bit errors and clock jitter in high-speed serial links (e.g., MIPI, PCIe). | Use Scenario: Providing stable 3.3V bias to RF front-end modules (FEMs) and low-noise amplifiers (LNAs) in cellular infrastructure. IC Role / Device Role / Timing Role: Post-regulator cleaning switching converter ripple before sensitive RF circuitry. Use Value: 63dB ripple rejection at 120Hz and 340mV dropout enable efficient use of intermediate bus voltages (e.g., 4.3V input). |
| Industrial PLC I/O Module | Medical Imaging Sensor Interface |
Use Scenario: Powering isolated digital I/O drivers and analog front-ends in programmable logic controllers with wide ambient temperature range. IC Role / Device Role / Timing Role: Robust 3.3V supply with reverse polarity and thermal protection for field-deployed equipment. Use Value: −40°C to +125°C junction rating and reverse-battery tolerance eliminate need for external protection components. | Use Scenario: Supplying precision analog signal chains in portable ultrasound or MRI sensor nodes requiring ultra-low noise. IC Role / Device Role / Timing Role: Low-noise, low-drift voltage source for ADC reference buffers and op-amp biasing. Use Value: 1.5% output accuracy over temperature and 3mV load regulation ensure consistent gain calibration across operating conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS7A4700RGWR | 20V input, 1A max, 4µVRMS noise (10Hz–100kHz), adjustable only | Lower noise but lower current; requires external resistors for 3.3V setting | Choose for ultra-low-noise analog rails where 1A suffices and adjustability is acceptable |
| MCP1703T-3302E/MB | 100mA max, SOT-223, 17µVRMS noise, 600mV dropout at 100mA | Not a current-capable replacement; suited only for low-power microcontrollers or sensors | Use only in space-constrained, low-current designs where 1.5A capability is unnecessary |
Compared with TPS7A4700RGWR and MCP1703T-3302E/MB, the LT1963ET#30PBF uniquely combines 1.5A output, 340mV dropout, and 40µVRMS noise in a thermally robust TO-220 package - making it irreplaceable for high-current, low-noise embedded power rails without redesigning thermal layout or sacrificing transient performance.
Availability
LT1963ET#30PBF is available at Aetrix Electronics and suitable for industrial automation, medical imaging subsystems, and wireless infrastructure requiring stable component supply, long-term lifecycle support, and RoHS-compliant lead-free packaging.
Supply support for LT1963ET#30PBF 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 its high-performance analog portfolio, emphasizing precision, power efficiency, and reliability for demanding signal chain and power management applications.
The LT1963 series was designed specifically for high-current, low-noise LDO applications in RF, instrumentation, and battery-powered systems - prioritizing fast transient response, dropout minimization, and integrated protection over cost-optimized general-purpose regulation.
FAQ
What is the maximum input voltage rating for LT1963ET#30PBF?
The LT1963ET#30PBF has an absolute maximum input voltage of ±20V relative to GND. However, the input-to-output differential voltage must not exceed ±20V - meaning if VIN is at +20V, VOUT cannot fall below 0V. For normal 3.3V operation, the recommended input range is 3.64V to 20V to maintain regulation and avoid exceeding thermal limits.
Does LT1963ET#30PBF require an external diode for reverse input protection?
No, the LT1963ET#30PBF integrates reverse-battery protection and does not require an external series diode. When VIN is reversed (e.g., −20V), the device blocks reverse current flow and prevents damage to itself and downstream circuitry - reducing BOM count and eliminating forward voltage drop losses.
Can LT1963ET#30PBF be used with ceramic output capacitors?
Yes, the LT1963ET#30PBF is stable with ceramic output capacitors ≥10µF, provided their ESR falls within 50mΩ to 3Ω. X5R and X7R dielectrics are preferred over Y5V/Z5U due to better DC bias and temperature stability. Always verify effective capacitance at operating voltage and temperature per manufacturer datasheets.
What is the purpose of the SENSE pin on LT1963ET#30PBF?
The SENSE pin on LT1963ET#30PBF enables Kelvin (remote) sensing by connecting directly to the load side of PCB traces. This compensates for voltage drop across trace resistance, ensuring precise 3.3V regulation at the point of load - critical for high-current or low-tolerance applications where trace IR drop would otherwise degrade accuracy.
How does LT1963ET#30PBF behave during startup into a heavy load?
The LT1963ET#30PBF features inherent safe operating area (SOA) protection that allows it to start up into heavy loads: as VIN rises, the output follows VIN until regulation is achieved. This prevents brownout during cold-start conditions. However, recovery from output short-circuit with high VIN may require cycling input power if double-load-line intersection occurs.
LT1963ET#30PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- TO-220-5 Formed Leads
- Packaging:
- Tube
- Product Status:
- Active
- Output Configuration:
- Positive
- Output Type:
- Adjustable
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 20V
- Voltage - Output (Min/Fixed):
- 1.21V
- Voltage - Output (Max):
- 20V
- Voltage Dropout (Max):
- 0.55V @ 1.5A
- Current - Output:
- 1.5A
- Current - Quiescent (Iq):
- 1.5 mA
- Current - Supply (Max):
- 120 mA
- PSRR:
- 63dB (120Hz)
- Control Features:
- Enable
- Protection Features:
- Over Current, Over Temperature, Reverse Polarity
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-220-5 Flow 30
LT1963ET#30PBF FAQ
1.How can I place an order for LT1963ET#30PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1963ET#30PBF 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 LT1963ET#30PBF reliable?
The price and inventory of LT1963ET#30PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1963ET#30PBF is usually 5 days.
3.What payment methods are accepted for LT1963ET#30PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1963ET#30PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1963ET#30PBF?
LT1963ET#30PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1963ET#30PBF 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 LT1963ET#30PBF?
For technical support, including LT1963ET#30PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1963ET#30PBF requirements.
6.How does Aetrix verify that LT1963ET#30PBF is sourced from the original manufacturer or authorized distributors?
All LT1963ET#30PBF 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 LT1963ET#30PBF meets industry standards.
7.What is the process for return or replacement of LT1963ET#30PBF?
All LT1963ET#30PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1963ET#30PBF, 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 LT1963ET#30PBF part is unused and in its original packaging.
Return procedure for LT1963ET#30PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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