TPS73633DBVR - 3.3V 400mA LDO Regulator | SOT-23-5 | Texas Instruments
N.º de pieza: TPS73633DBVR ✓ Activo| Cant. | Precio unitario | Total |
|---|---|---|
| 1 | $1.32 | $1,32 |
| 10 | $1.1 | $11,00 |
| 100 | $0.85 | $85,00 |
| 500 | $0.62 | $310,00 |
| 1.000 | $0.45 | $450,00 |
| 3.000 | $0.3 | $900,00 |
TPS73633DBVR Descripción general
An LDO (Low-Dropout) linear regulator is a type of voltage regulator that maintains a constant output voltage even when the input voltage approaches the output voltage. Positioned in the broader hierarchy, an LDO is a sub-class of linear regulator, which sits within the voltage regulator family, itself part of the power management integrated circuit (PMIC) category in mixed-signal semiconductors. LDOs are favored over switching regulators when the design demands ultra-low noise, fast transient response, and a minimal external component count.
Key features of the TPS73633DBVR include: stability with NO output capacitor or with any capacitor type/value (cap-free operation), 75 mV typical dropout at 400 mA, ±0.5 % overall output accuracy, near-constant ground pin current over load, and integrated reverse-current protection that blocks discharge from the output back into the input when the input falls. The small SOT-23-5 footprint and 5 µA quiescent current make it attractive for portable, battery-powered designs.
The TPS736 family uses an NMOS pass transistor driven by a high-drive charge pump and a precision bandgap reference. This topology yields low dropout and high reverse blockage while keeping the GND current nearly flat across the load curve, preserving efficiency at light loads where battery life matters most. The part includes internal current limiting and thermal shutdown for fault protection.
Typical applications include portable/battery-powered equipment (handheld terminals, wearables, IoT sensor nodes), point-of-load regulation for microcontrollers and wireless modules, post-regulation following a DC-DC switcher to clean ripple, and industrial sensors running off 3.3 V rails.
When designing with this part, the user can simply tie IN to OUT through a short trace if no bypass cap is available - the regulator is stable either way. Add a 0.1 µF X7R input cap if the source impedance is high or the input trace is long.
This page synthesizes TI datasheet parameters, distributor pricing, drop-in SOT-23-5 alternatives, and practical design notes that you will not find in the bare datasheet PDF - including cross-brand pin-compatible equivalents and parametric trade-offs across the TPS736 family.
Alternativas directas para TPS73633DBVR — mismo encapsulado, compatible pin a pin. Se excluyen las piezas de otro encapsulado que requieren retrabajo de la PCB.
Herramienta de comparación rápida — seleccione piezas alternativas para compararlas lado a lado:
TPS73633DBVT
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
TPS73625DBVR
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
TPS73633MDBVREP
✅ Sustitución directa ⚠️ Especificaciones sin verificar📋 Alternativa de referencia (no en el catálogo)
TPS73618DBVR
✅ Sustitución directa ⚠️ Especificaciones sin verificar📋 Alternativa de referencia (no en el catálogo)
TPS73233DBVR
✅ Sustitución directa ⚠️ Especificaciones sin verificar📋 Alternativa de referencia (no en el catálogo)
LP2985-33DBVR
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
TPS73633DBVR Valores máximos y características eléctricas
| Tipo de salida | Fixed |
| Output Voltage (Nominal) | 3.3 V |
| Corriente de salida máxima | 400 mA |
| Rango de tensión de entrada | 1.7 V to 5.5 V |
| Tensión de dropout | 75 mV typical at 400 mA |
| Output Accuracy | ±0.5 % |
| Topología | NMOS pass element (voltage-follower) |
| Ground Pin Current | Near-constant over load range |
| Reverse Current Protection | Yes (integrated reverse blockage) |
| Enable Input | Yes (active-high) |
| Output Capacitor Requirement | None required (cap-free stable with any cap) |
| Rango de temperatura de funcionamiento | -40 °C to +125 °C |
| Encapsulado | SOT-23-5 (DBV) |
| Tipo de montaje | Surface Mount |
| Nivel MSL | Level-1-260C-UNLIM (per PartGenie) |
| Estado RoHS | ROHS3 Compliant |
| Process Technology | BiCMOS |
Configuración de pines de TPS73633DBVR
| Pin 1 | IN — Input supply voltage (1.7 V to 5.5 V) |
| Pin 2 | GND — Ground |
| Pin 3 | EN — Enable input (active-high) |
| Pin 4 | NC — Not connected (per datasheet) |
| Pin 5 | OUT — Regulated 3.3 V output |
Aplicaciones típicas
TPS73633DBVR es adecuado para 7 aplicacións: Portable / Battery-Powered Equipment, Microcontroller Point-of-Load Regulation, Post-Regulation After a Switching Converter, Industrial Sensor Power Rails, IoT and Wireless Sensor Nodes, USB-Powered 3.3 V Systems, Power for Portable Test / Measurement Handhelds.
Portable / Battery-Powered Equipment
The TPS73633DBVR suits handheld and battery-powered designs thanks to its 1.7 V–5.5 V input range covering single-cell Li-ion (3.0–4.2 V), near-constant ground-pin current over the 0–400 mA load range, and 5 µA-class quiescent draw that preserves standby life. With 75 mV dropout at full load, the regulator continues regulating until the battery is almost fully depleted, maximizing usable capacity. The SOT-23-5 footprint occupies <10 mm² of board area, freeing space for sensors or radios in wearables, handhelds, and remote controls. Compared to a switching converter, the LDO adds zero switching ripple to sensitive analog or RF rails downstream.
Recomendado
Microcontroller Point-of-Load Regulation
Use the TPS73633DBVR as a dedicated 3.3 V point-of-load (POL) supply for an MCU or wireless SoC powered from a higher system rail (e.g., 5 V or a switched 3.7 V intermediate). The 75 mV dropout at 400 mA keeps the LDO in regulation even under momentary input sags during heavy digital transients, while the integrated reverse-current block protects the upstream supply when the input collapses before the output. Active-high enable allows software-controlled power gating of the MCU rail, putting the SoC into deep sleep without powering down the rest of the board. Cap-free stability simplifies the BOM and reduces PCB area around the MCU.
Recomendado
Post-Regulation After a Switching Converter
The TPS73633DBVR is an excellent post-regulator when placed after a buck or boost switching converter. While the upstream switcher handles the bulk voltage step-down with high efficiency, the LDO cleans up switching ripple and high-frequency noise, providing an ultra-clean 3.3 V rail for analog, RF, or precision-sensing subsystems. The 72 dB-class PSRR at low frequencies (typical of NMOS LDOs in this family) attenuates the residual ripple that passes through the switcher's output filter. Cap-free output stability lets the LDO sit directly at the load with no bulk reservoir, simplifying routing in mixed-signal designs.
Recomendado
Industrial Sensor Power Rails
The TPS73633DBVR's -40 °C to +125 °C operating range suits industrial environment sensors running from 24 V-to-3.3 V intermediate bus rails. The integrated thermal shutdown and current limit protect the sensor and the LDO if the load develops a fault, while reverse-current protection prevents power-back on multi-sensor buses where one node could sink current into the rail. The 400 mA rating supports multiple loads on a single rail when sensors are clustered. Cap-free stability is useful for sealed IP67 enclosures where any electrolytic output cap is a reliability concern over time.
Recomendado
IoT and Wireless Sensor Nodes
The TPS73633DBVR fits IoT nodes that spend most of their life in deep sleep and periodically wake to transmit. The near-constant ground-pin current over the full load range means standby losses do not balloon at light loads; the active-high enable allows a GPIO from the host MCU to completely power-gate downstream radios, cutting quiescent to leakage levels between transmissions. Combined with 75 mV dropout, the design can transmit useful telemetry down to battery voltages that disable heavier LDO competitors. Its SOT-23-5 size supports coin-cell and small Li-Po form factors typical of wireless sensor modules.
Recomendado
USB-Powered 3.3 V Systems
Use the TPS73633DBVR to derive a clean 3.3 V rail from the USB 5 V VBUS. At full 400 mA load with a worst-case 5.0 V input, the LDO dissipates only ~680 mW (5.0 V minus 3.3 V times 0.4 A), well within the SOT-23-5 thermal envelope without an external heatsink. Reverse-current protection prevents back-drive from the regulated rail into the USB port if VBUS is removed during operation - critical for USB device designs that must be plug-and-play. The active-high enable pin can be tied to a USB voltage-divider or a GPIO to soft-start the load.
Recomendado
Power for Portable Test / Measurement Handhelds
The TPS73633DBVR suits portable test and measurement instruments (multimeters, data loggers, handheld oscilloscopes) that demand clean power rails for precision analog front-ends. The LDO's low noise - typical of NMOS topology with internal bandgap reference - keeps measurement rails free of switching noise that would couple into high-impedance sensor paths. With ±0.5 % output accuracy, the regulator maintains tight calibration even as the Li-ion battery discharges from 4.2 V down to 3.5 V. The integrated protections (thermal, current limit, reverse current) harden the design against field abuse.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para TPS73633DBVR — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | TPS73633DBVT | TPS73625DBVR | TPS73633MDBVREP | TPS73233DBVR | LP2985-33DBVR |
|---|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | SOT-23-5 (DBV) | SOT-23-5 (DBV) - same | SOT-23-5 (DBV) - same | SOT-23-5 (DBV) - same | SOT-23-5 (DBV) - same | SOT-23-5 (DBV) - same |
| Output Voltage | 3.3 V | 3.3 V | 2.5 V | 3.3 V | 3.3 V | 3.3 V |
| Output Current | 400 mA | 400 mA | 400 mA | 400 mA | 400 mA | 150 mA |
| Reverse-Current Protection | Yes | Yes | Yes | Yes | No | No |
| Output Accuracy | ±0.5 % | ±0.5 % | ±0.5 % | ±0.5 % | ±1 % | ±1 % |
| Cap-Free Output Stability | Yes (stable with no cap or any cap) | Yes | Yes | Yes | Yes | No (requires 2.2 µF min) |
Diferenciadores clave
- Integrated reverse-current protection in SOT-23-5 (frente a TPS73233DBVR)
- Cap-free output stability with any capacitor type (frente a LP2985-33DBVR)
- Wider TPS736 family breadth for design reuse (frente a Standalone competitor 3.3 V LDOs)
Notas de diseño
Estimated: at VIN=5 V, VOUT=3.3 V, IOUT=400 mA (worst-case DC load from USB), power dissipation is (5.0-3.3)×0.4 = 0.68 W. With the SOT-23-5 theta_JA around 200 °C/W on a small 1 oz copper pour, junction temperature rise ≈ 136 °C - this exceeds the 125 °C max at 25 °C ambient. Solution: use a larger copper pour (≥1 cm²) or reduce VIN to 3.7-4.2 V (single-cell Li-ion) where Pd drops to (4.0-3.3)×0.4 = 0.28 W and Tj rise ≈ 56 °C - safe margin.
Even though the TPS73633DBVR is cap-free stable, place a 0.1 µF X7R input bypass capacitor close to the IN pin when the upstream source impedance is high or the input trace is longer than ~25 mm. This filters high-frequency noise on the input rail and prevents the IC's internal charge pump from amplifying input ringing. Keep the GND pin return trace short and direct to the system ground plane to avoid load-regulation errors at high di/dt transients.
Do not leave the EN pin floating - it MUST be tied to IN (or driven high) for normal operation; a floating enable leaves the regulator in an undefined state and can prevent startup or cause oscillation. If unused, drive EN from a GPIO with a 100 kΩ pull-up to IN. Also, ensure the maximum input voltage (5.5 V) is not exceeded - even brief transients above this absolute maximum can damage the NMOS pass element and the internal ESD cells.
The TPS73633DBVR's reverse-current protection is active even when EN is low - it prevents current from flowing back from the output capacitor into the input when the input collapses (e.g., battery removal). This is why the part is favored over the TPS73233 in systems where the output rail may be momentarily held up by bulk capacitance after the input falls. The trade-off is a slightly higher quiescent current than non-reverse-blocking LDOs in this category.
Información de cumplimiento
ROHS3 Compliant per PartGenie listing; MSL Level-1-260C-UNLIM (unlimited floor life). Non-automotive grade - for AEC-Q100 needs, see TPS736-Q1 variants. NOT claimed halogen-free in verified data.