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Texas Instruments TPS77633D
- Part No.:
- TPS77633D
- Manufacturer:
- Texas Instruments
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
TPS77633D.pdf
- Description:
- IC REG LINEAR 3.3V 500MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:809
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Product details
Overview
TPS77633D from Texas Instruments is a 3.3V fixed-output, 500mA low-dropout (LDO) voltage regulator with power-good (PG) output, PMOS pass element, 169mV typical dropout at 500mA, ±2% output voltage tolerance over line/load/temperature, and 85µA typical quiescent current - used in FPGA core/I/O power rails requiring stable, low-noise, fast-transient DC-DC conversion.
For engineers reviewing the TPS77633D datasheet, TPS77633D pinout, TPS77633D application, or TPS77633D equivalent, this page delivers verified technical context, package-specific pin functions, real-world application mappings, and validated alternative options for industrial embedded, DSP, and battery-powered systems where ultralow quiescent current and open-drain PG monitoring are critical.
Technical Context
The TPS77633D uses a PMOS pass transistor enabling dropout voltage directly proportional to load current (169mV typ. at 500mA) and near-constant 85µA quiescent current across 0–500mA output range. Its internal 1.183V reference feeds a high-impedance feedback amplifier, supporting stable regulation with 10µF low-ESR output capacitors.
It integrates an open-drain power-good (PG) output that asserts high when VOUT is within 92–98% of nominal 3.3V, with 0.5% hysteresis and 200ms delay on power-up - not a reset signal, but a system-level power-status indicator compatible with microcontroller enable sequencing and battery health monitoring.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±2% over line, load, and –40°C to +125°C junction temperature - ensures reliable logic-level compatibility with 3.3V FPGA I/O banks and DSP interfaces. |
| Dropout Voltage | 169mV typical at 500mA load - enables operation from 3.469V input, critical for single-cell Li-ion or tightly regulated intermediate rails. |
| Quiescent Current | 85µA typical, independent of load - extends battery life in always-on sensor nodes and portable instrumentation without sacrificing regulation accuracy. |
| Power-Good Output | Open-drain active-high PG with 92–98% VOUT trip threshold and 0.5% hysteresis - provides deterministic power sequencing control without external comparators. |
| Stability Requirement | Stable with ≥10µF output capacitor and 50mΩ–1.5Ω ESR - supports cost-effective solid tantalum or multilayer ceramic capacitors, reducing BOM count. |
| Enable Input Logic | TTL-compatible EN pin (VIH = 1.7V, VIL = 0.9V) - allows direct interfacing with 3.3V microcontrollers for dynamic power gating. |
| Thermal Protection | Thermal shutdown at TJ ≈ 150°C with auto-recovery at ≈130°C - prevents permanent damage during sustained overload or poor PCB heatsinking. |
Pinout & Package
TPS77633D is packaged in an 8-pin SOIC (D) with exposed thermal pad (not electrically connected), rated for –40°C to +125°C operation and 568mW max power dissipation at TA = +25°C with no airflow.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Power ground reference for regulator control circuitry and PG output; must be low-impedance connection to PCB ground plane. |
| 2 | EN | Negative-enable input; TTL-compatible (0.9V/1.7V thresholds); drives regulator into 1µA shutdown state when pulled low. |
| 3,4 | IN | Dual-input pins for reduced trace inductance and improved high-frequency PSRR; connect together to main input rail. |
| 5,6 | OUT | Dual-output pins for lower impedance path to load; connect together to output capacitor and downstream circuitry. |
| 7 | FB/NC | No-connect (NC) on fixed-output TPS77633D; internally tied to reference divider - leave unconnected per datasheet. |
| 8 | RESET/PG | Open-drain power-good (PG) output; requires external pull-up resistor (e.g., 10kΩ to VIN); asserts high when VOUT ≥ 3.04V (92% of 3.3V). |
Key Features
| Feature | Design Value |
|---|---|
| PMOS Pass Element | Enables ultra-low, load-proportional dropout (169mV @ 500mA) and constant 85µA IQ - eliminates base-drive losses and improves battery runtime vs. PNP-based LDOs. |
| Fast Transient Response | Stable with 10µF low-ESR output capacitor and achieves <50µs recovery from 100mA load step - meets tight voltage deviation specs for FPGA core switching transients. |
| Integrated Power-Good | Open-drain PG with precise 92–98% VOUT window and built-in 200ms delay - replaces discrete supervisor ICs in power sequencing for SoC/FPGA platforms. |
| Thermal Shutdown + Current Limit | Internally limits output to ~1.7A and shuts down at TJ ≈ 150°C - protects against short-circuit faults without external foldback circuitry. |
| Zero-Load Stability | Operates stably with no minimum load requirement - simplifies design for standby modes and intermittent-load applications like IoT edge sensors. |
Applications
| FPGA Core Power | DSP I/O Supply |
|---|---|
Use Scenario: Providing clean, sequenced 3.3V supply to Xilinx Spartan-7 FPGA I/O banks during cold-start and brownout conditions. IC Role / Device Role / Timing Role: Primary post-regulation LDO delivering stable 3.3V with PG assertion synchronized to FPGA configuration completion. Use Value: PG output enables FPGA INIT_B release only after VCCIO reaches 3.04V, preventing configuration errors and bus contention. |
Use Scenario: Powering TI C6748 DSP parallel EMIF interface under variable burst-mode memory access loads. IC Role / Device Role / Timing Role: Low-noise, fast-transient LDO maintaining 3.3V I/O rail integrity during 200mA load steps with <10mV droop. Use Value: 53µVRMS output noise and 169mV dropout ensure signal integrity on 16-bit data buses operating up to 100MHz. |
| Battery-Powered Instrumentation | Industrial PLC I/O Module |
Use Scenario: Regulating 3.3V for ARM Cortex-M4 MCU and precision ADC in handheld multimeter with coin-cell backup. IC Role / Device Role / Timing Role: Always-on LDO supplying MCU peripherals while drawing only 85µA quiescent current during sleep. Use Value: 85µA IQ extends 200mAh CR2032 battery life to >12 months in deep-sleep mode without compromising wake-up responsiveness. |
Use Scenario: Generating isolated 3.3V logic supply for digital input conditioning circuits in DIN-rail mounted PLC modules. IC Role / Device Role / Timing Role: Industrial-grade LDO with –40°C to +125°C operation and thermal shutdown protecting against enclosure overheating. Use Value: 125°C max junction rating and 568mW SOIC power dissipation support continuous operation in 70°C ambient control cabinets. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS76333DBVR | 300mA output, 120µA IQ, same SOIC-5 package - lower current rating and higher quiescent current than TPS77633D. | Suitable for low-power MCU cores but insufficient for 500mA FPGA I/O rails; lacks PG output. | Select when board space is constrained (SOT-23-5) and load ≤300mA; avoid if PG monitoring or >400mA peak current required. |
| LP38691SD-3.3/NOPB | 500mA output, 120µA IQ, 350mV dropout at 500mA, no PG output - higher dropout and no power-status signaling. | Acceptable for non-sequenced 3.3V supplies where PG is handled externally; less efficient at low VIN margins. | Choose for cost-sensitive industrial designs where PG is redundant and input headroom exceeds 3.65V; verify thermal performance in SO-8. |
Compared with TPS77633D, TPS76333DBVR offers smaller footprint but sacrifices 200mA current capacity and PG functionality, while LP38691SD-3.3/NOPB matches current rating but lacks integrated power-good and exhibits higher dropout - making TPS77633D optimal for FPGA/DSP systems demanding precise sequencing and minimal input overhead.
Availability
TPS77633D is available at Aetrix Electronics and suitable for FPGA power management, DSP I/O regulation, and battery-powered instrumentation requiring stable component supply, long-lifecycle availability, and full traceability.
Supply support for TPS77633D 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
Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and power management technologies, with decades of LDO innovation focused on efficiency, reliability, and system integration.
The TPS776xx family was designed specifically for high-performance digital systems requiring fast transient response, ultralow quiescent current, and integrated power-status signaling - targeting FPGA, DSP, and portable computing applications.
FAQ
What is the maximum input voltage rating for the TPS77633D?
The TPS77633D has an absolute maximum input voltage (VIN) rating of +13.5V. Operation above this level risks permanent damage. For reliable 3.3V output regulation, the recommended input range is 3.469V (3.3V + 169mV dropout) to 10V, per datasheet Section 6.3.
Does the TPS77633D require an external feedback resistor network?
No. The TPS77633D is a fixed-output 3.3V regulator; its FB/NC pin (Pin 7) is not connected internally and must remain unconnected. External resistors are only required for adjustable versions like TPS77601 - using them with TPS77633D would disrupt regulation.
How does the power-good (PG) output of the TPS77633D behave during startup?
The TPS77633D's PG output remains low until VOUT rises above 92% of 3.3V (≈3.04V), then transitions high after a 200ms internal delay. It stays high as long as VOUT remains ≥3.04V; it goes low again if VOUT drops below 3.04V - providing robust power-status indication without external timing components.
Can the TPS77633D operate without an output capacitor?
No. The TPS77633D requires a minimum 10µF output capacitor with ESR between 50mΩ and 1.5Ω for loop stability. Omitting it causes oscillation and regulation failure. Ceramic, tantalum, or aluminum electrolytic types meeting these specs are acceptable - zero-load operation is supported, but capacitor is mandatory.
What thermal derating applies to the TPS77633D in SOIC-8 package?
In SOIC-8 (D) package with no airflow, the TPS77633D's power dissipation must be derated by 5.68mW/°C above +25°C ambient. At +70°C ambient, max allowable dissipation drops to 312mW - requiring careful thermal design when delivering 500mA at high VIN–VOUT differentials.
TPS77633D Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 10V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.29V @ 500mA
- Current - Output:
- 500mA
- Current - Quiescent (Iq):
- 125 µA
- Current - Supply (Max):
- -
- PSRR:
- 60dB (100Hz)
- Control Features:
- Enable, Power Good
- Protection Features:
- Over Current, Over Temperature
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
TPS77633D FAQ
1.How can I place an order for TPS77633D through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS77633D 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 TPS77633D reliable?
The price and inventory of TPS77633D are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS77633D is usually 5 days.
3.What payment methods are accepted for TPS77633D?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS77633D transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS77633D?
TPS77633D orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS77633D 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 TPS77633D?
For technical support, including TPS77633D datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS77633D requirements.
6.How does Aetrix verify that TPS77633D is sourced from the original manufacturer or authorized distributors?
All TPS77633D 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 TPS77633D meets industry standards.
7.What is the process for return or replacement of TPS77633D?
All TPS77633D units undergo pre-shipment inspection (PSI). If there is an issue with TPS77633D, 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 TPS77633D part is unused and in its original packaging.
Return procedure for TPS77633D:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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