TPS77033DBVT - 50mA, 3.3V Ultra-Low-Power LDO | Texas Instruments
N.º da peça: TPS77033DBVT ✓ Ativo| Qtd. | Preço unitário | Total |
|---|---|---|
| 1 | $1.1 | $1,10 |
| 10 | $0.95 | $9,50 |
| 100 | $0.82 | $82,00 |
| 500 | $0.72 | $360,00 |
| 1.000 | $0.62 | $620,00 |
| 3.000 | $0.5 | $1.500,00 |
TPS77033DBVT Visão geral
An LDO (low-dropout) linear regulator is a type of linear voltage regulator that maintains a stable output voltage even when the input-to-output voltage differential approaches the regulator's dropout limit. In the broader component taxonomy, an LDO is a sub-category of linear regulator, which itself sits under the voltage-regulator family within power-management ICs. LDOs are preferred over switching regulators in noise-sensitive analog and RF signal paths because, unlike a buck or boost converter, an LDO introduces no switching ripple and produces a spectrally clean output that does not require heavy post-filtering.
Key specifications of the TPS77033DBVT include 3.3 V fixed output with ±2 % accuracy (TPS770 family), 48 mV typical dropout at 50 mA, 17 µA typical I_Q (28 µA max on the new chip), 1 µA standby current with EN pulled low, ±2 % output tolerance over line, load, and temperature, and internal current limit with thermal shutdown. The 5-pin SOT-23 (DBV) package has a theta_JA of approximately 180 °C/W on a standard JEDEC 4-layer test card, allowing 50 mA continuous operation from -40 °C to +125 °C junction temperature.
Internally, the TPS77033 uses a P-channel MOSFET pass element driven by a precision bandgap reference. The P-channel architecture allows the part to regulate with very low input-to-output differential, eliminating the need for a charge pump or auxiliary supply. The enable pin places the regulator into a low-I_Q standby state when asserted, supporting battery-powered duty-cycled loads.
Typical applications include battery-powered portable and wearable electronics where quiescent current dominates standby life, microcontroller and real-time clock (RTC) rails in IoT edge nodes, post-regulation after a switching converter to strip ripple on noise-sensitive analog rails, 3.3 V logic supply in handheld instruments, and as a keep-alive rail in USB and other plug-in peripherals.
When designing with the TPS77033DBVT, place a 1 µF or larger low-ESR ceramic output capacitor within 1 cm of the OUT pin to ensure loop stability. The PG (power-good) output is open-drain and requires a pull-up resistor. Verify that the input voltage never exceeds the 10 V absolute maximum, even on load-dump transients, by adding a TVS clamp if the rail is exposed to automotive or industrial surges.
This page synthesizes distributor pricing, drop-in SOT-23-5 alternatives, and practical battery-life design notes not found in the manufacturer datasheet alone, providing a one-stop engineering reference for TPS77033DBVT selection.
Alternativas drop-in para TPS77033DBVT — mesmo encapsulamento, compatível pino a pino. Peças de encapsulamento diferente que exigem retrabalho na PCB são excluídas.
Ferramenta de comparação rápida — selecione peças alternativas para comparação lado a lado:
TPS77033DBVTG4
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
TPS77033DBVR
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
TPS77030DBVT
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
TPS77050DBVT
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
TPS76933DBVT
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
TPS77001DBVT
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
TPS77033DBVT Classificações máximas e características elétricas
| Tipo de saída | Fixed |
| Tensão de saída | 3.3 V |
| Output Voltage Accuracy | ±2 % (TPS770 family, over line/load/temp) |
| Corrente máxima de saída | 50 mA |
| Faixa de tensão de entrada | 2.7 V to 10 V |
| Dropout Voltage (typical) | 48 mV at 50 mA |
| Quiescent Current (active) | 17 µA typical |
| Quiescent Current (standby, EN low) | 1 µA typical |
| Enable Input | Active-low EN (logic-level compatible) |
| Saída Power Good | Open-drain PG (requires external pull-up) |
| Temperatura de junção de operação | -40 °C to +125 °C |
| Thermal Resistance (theta_JA, SOT-23-5) | ≈ 180 °C/W (JEDEC 4-layer, manufacturer datasheet) |
| Limitação de corrente | Internal (per device, see datasheet) |
| Desligamento térmico | Yes (internal) |
| Encapsulamento | SOT-23-5 (DBV) |
| Tipo de montagem | Surface Mount |
| Nível MSL | 1 (per TI package profile) |
| Lead-Free / RoHS | Yes / Yes |
| Marking Code | PCXI |
Configuração de pinos do TPS77033DBVT
| Pino 1 | IN — Unregulated input supply (2.7 V to 10 V) |
| Pino 2 | GND — Ground reference |
| Pino 3 | EN — Active-low enable; drive low for 1 µA standby |
| Pino 4 | PG — Open-drain power-good output; pulls low when Vout is below regulation |
| Pino 5 | OUT — Regulated 3.3 V output (up to 50 mA) |
Aplicações típicas
TPS77033DBVT é adequado para 6 aplicaçãos: Battery-Powered IoT Sensor Node, Real-Time Clock (RTC) Keep-Alive Rail, Post-Regulation After a Switching Converter, USB Peripheral Keep-Alive Supply, Portable Medical / Wearable Monitor, Handheld Test Equipment 3.3 V Logic Rail.
Battery-Powered IoT Sensor Node
The TPS77033DBVT fits coin-cell and AAA-battery IoT sensor nodes because its 17 µA active quiescent current and 1 µA standby current (EN low) extend battery life dramatically versus typical 1 mA-IQ LDOs. Its 50 mA output is sufficient for low-power microcontrollers (e.g., MSP430, STM32L0) and 2.4 GHz radio bursts. With a 48 mV dropout at 50 mA, the LDO still delivers a regulated 3.3 V from inputs down to 3.35 V, allowing the cell to be used nearly to end-of-life. The SOT-23-5 footprint occupies <9 mm² and the EN pin supports duty-cycled sleep for years of standby life on a single CR2032.
Recomendado
Real-Time Clock (RTC) Keep-Alive Rail
The TPS77033DBVT is well matched as a 3.3 V always-on rail for an external RTC IC or RTC-integrated MCU, where total system current draw in sleep is often under 100 µA and standby I_Q dominates battery-life budget. Its 1 µA standby current (EN asserted low during shipping/storage) and clean post-regulation of any upstream switching noise make it ideal for timekeeping accuracy. The internal thermal shutdown and current limit protect against fault conditions even on long-life primary-cell rails. Place a 1 µF low-ESR ceramic on OUT for stability per the TI TPS770 datasheet.
Recomendado
Post-Regulation After a Switching Converter
Switching converters generate harmonics across hundreds of kHz that couple into noise-sensitive analog rails (sensors, ADCs, audio codecs). The TPS77033DBVT placed downstream of a buck or boost converter strips switching ripple via its PSRR, delivering a clean 3.3 V to analog blocks while the upstream converter provides bulk efficiency. Its 50 mA rating suits low-power analog front ends, sensor bias networks, and reference buffers. Unlike a switching post-regulator, the TPS77033DBVT adds no switching noise of its own; this is critical for MEMS microphones and 24-bit sigma-delta ADCs.
Recomendado
USB Peripheral Keep-Alive Supply
USB peripherals often need a small keep-alive rail that remains powered when the host suspends the bus (50 mA / 100 mA / 500 mA tiers). The TPS77033DBVT can be powered from the VBUS line (5 V) directly, providing 3.3 V at 50 mA to MCU logic and a low-power indicator LED. Its 10 V absolute-max input survives the USB inrush and hot-plug transients, and the 48 mV dropout is irrelevant at 5 V input. Active-low EN allows the MCU to disable the rail in deep standby, drawing only 1 µA. The SOT-23-5 package is small enough for thumb-drive-class form factors.
Recomendado
Portable Medical / Wearable Monitor
Wearable health monitors (pulse oximeters, continuous-glucose monitors, ECG patches) demand long battery life on coin-cell or rechargeable Li-ion cells. The TPS77033DBVT delivers 3.3 V to a low-power analog front end and BLE radio at 50 mA peak, with 17 µA I_Q during idle and 1 µA standby. Its ±2 % output accuracy ensures stable sensor bias and reference voltages; thermal shutdown protects patient-contact devices under fault. The small SOT-23-5 footprint supports wrist-watch-class PCB layouts. According to the TI TPS770 datasheet, the part is rated for -40 °C to +125 °C junction temperature.
Recomendado
Handheld Test Equipment 3.3 V Logic Rail
Handheld multimeters, oscilloscope probes, and field-installers' tools need a clean 3.3 V rail for MCUs, displays, and ADCs, often powered from 2-4 AA cells (3 V to 6 V input). The TPS77033DBVT's 2.7 V to 10 V input range covers alkaline and NiMH packs directly, while 48 mV dropout at 50 mA leaves ample headroom as cells decay. Active-low EN supports a power-button circuit; open-drain PG can drive a "ready" LED or feed the MCU's interrupt for deterministic power sequencing. The SOT-23-5 footprint suits compact handheld enclosures.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para TPS77033DBVT — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto | TPS77033DBVTG4 | TPS77033DBVR | TPS77030DBVT | TPS77050DBVT | TPS76933DBVT | TPS77001DBVT |
|---|---|---|---|---|---|---|---|
| Brand | Texas Instruments | 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 | SOT-23-5 (DBV) - same |
| Output Voltage | 3.3 V fixed | 3.3 V fixed (identical) | 3.3 V fixed (identical) | 3.0 V fixed | 5.0 V fixed | 3.3 V fixed | Adjustable (1.2 V to 5.5 V) |
| Maximum Output Current | 50 mA | 50 mA | 50 mA | 50 mA | 50 mA | 100 mA | 50 mA |
| Input Voltage Range | 2.7 V to 10 V | 2.7 V to 10 V | 2.7 V to 10 V | 2.7 V to 10 V | 2.7 V to 10 V | 2.7 V to 10 V | 2.7 V to 10 V |
| Quiescent Current (active) | 17 µA | 17 µA | 17 µA | 17 µA | 17 µA | Higher (~28 µA typical) | 17 µA |
| Enable Pin | Yes (active-low) | Yes (active-low) | Yes (active-low) | Yes (active-low) | Yes (active-low) | Yes (active-low) | Yes (active-low) |
| Pin 4 Function | PG (power-good, open-drain) | PG | PG | PG | PG | PG | FB (feedback resistor divider) |
Principais diferenciais
- Ultra-low 1 µA standby quiescent current (vs TPS76933DBVT)
- Same SOT-23-5 footprint across the entire TPS770 family (vs TPS77030DBVT / TPS77050DBVT / TPS77001DBVT)
- Open-drain PG output for power-good signaling (vs TPS77001DBVT (adjustable version))
Notas de projeto
Estimated: input transient on VBUS / inductive loads can spike IN above the 10 V absolute maximum even with a steady 5 V supply, especially during hot-unplug events. Add a TVS clamp (e.g., 12 V SMAJCA) or a small RC snubber if the input rail is exposed to USB, automotive, or inductive kickback transients. The TPS77033DBVT has no internal input clamp and will be damaged by over-voltage stress.
Place the 1 µF (or larger) low-ESR ceramic output capacitor within 1 cm of the OUT pin and use a wide ground pour under the package to ensure loop-stability per the TI TPS770 datasheet. Tie the PG pin's pull-up resistor (10 kΩ to 100 kΩ to OUT or logic rail) close to the device to minimize noise pickup. Keep the high-current OUT trace short and wide to avoid IR drop on the regulated rail.
Estimated: at VIN = 5 V, VOUT = 3.3 V, and IOUT = 50 mA, the regulator dissipates approximately 85 mW ((5-3.3) V * 0.05 A). On a JEDEC 4-layer test card the SOT-23-5 theta_JA is about 180 °C/W, producing only a 15 °C junction rise at 50 mA - well within the 125 °C limit. At the 10 V absolute-max input the dissipation roughly doubles to 170 mW, raising junction temperature by 30 °C; still safe but worth re-checking if the part is in a sealed enclosure.
Use the EN pin for power-sequenced startup in multi-rail systems. Driving EN low disables the output and drops quiescent current to ~1 µA, ideal for shipping-mode or long-storage standby. Add a 100 kΩ pull-up to IN if EN will be left floating during assembly - the TPS77033DBVT has an internal pull-up, but an external resistor protects against ESD damage during handling.
Informações de conformidade
RoHS compliant per TI TPS770 product page; lead-free (Pb-free) and halogen-free per TI package profile. Not AEC-Q100 qualified; for automotive applications consider AEC-Q100-grade alternatives. Marking code on package: PCXI.