GS7133TD-R - 3A Ultra-Low Dropout LDO Regulator | GStek
N.º da peça: GS7133TD-R ✓ Ativo| Qtd. | Preço unitário | Total |
|---|---|---|
| 1 | $0.85 | $0,85 |
| 10 | $0.76 | $7,60 |
| 100 | $0.62 | $62,00 |
| 500 | $0.51 | $255,00 |
| 1.000 | $0.43 | $430,00 |
| 3.000 | $0.36 | $1.080,00 |
GS7133TD-R Visão geral
An LDO (Low-Dropout) linear regulator is a class of voltage regulator that maintains a tightly regulated output even when the input voltage is only marginally higher than the output. LDOs sit within the broader hierarchy of linear regulators, which are themselves a subset of voltage regulators and the wider power management IC family. Compared with switching DC-DC converters, LDOs introduce no switching noise, ripple, or EMI, at the cost of dissipating (V_IN - V_OUT) x I_LOAD as heat, which is why high-current parts like the GS7133 family require careful thermal budgeting.
Key features of the GS7133TD-R include 3A continuous output current, 240 mV typical dropout at full load, separate VDD bias supply for gate drive, internal soft-start, Power-OK (POK) open-drain flag with 92% threshold and built-in delay, current-limit and thermal-shutdown protection, and an adjustable output from 0.8V to near V_IN. The use of n-channel pass MOSFETs (rather than p-channel) lowers dropout and RDS_ON versus older-generation LDOs of similar current rating.
Architecturally, the GS7133 uses a separate VDD rail to power control circuitry and drive the internal n-channel pass MOSFET; this decoupling between power path and control path is what enables the very low 240 mV dropout at 3A. The control loop runs at approximately 2.25 MHz, which keeps loop bandwidth high enough for fast transient response to step loads while remaining stable with low-ESR ceramic output capacitors in the typical application circuit.
Typical applications for the GS7133TD-R include point-of-load regulation for 5V-to-3.3V or 3.3V-to-1.8V/1.2V core rails in networking and communication ASICs, FPGA auxiliary supplies, DDR memory termination rails, industrial PLC and motor-driver logic supply, and as a post-regulator following a switching converter to strip residual switching ripple from noise-sensitive analog blocks.
A key design consideration is thermal management: at 3A and a 1.5V dropout, the regulator must dissipate roughly 4.5W, which demands a substantial copper pour on DPAK tab plus, in many designs, an external heatsink. Designers should also confirm that the separate VDD bias is always present before or coincident with V_IN to avoid pass-MOSFET body-diode conduction during startup.
Alternativas drop-in para GS7133TD-R — 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:
GS7133T-R
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
GS7133TD
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
GS7133
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
AP7173
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
LD39300
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
GS7133TD-R Classificações máximas e características elétricas
| Topologia | Ultra-Low Dropout (LDO) Linear Regulator |
| Pass Element | Internal n-channel MOSFET |
| Maximum Continuous Output Current | 3 A |
| Typical Dropout Voltage | 240 mV at 3 A |
| Internal Reference Voltage | 0.8 V |
| Faixa de tensão de saída | 0.8 V to near V_IN (adjustable via external resistor divider) |
| Control Loop Frequency | approximately 2.25 MHz |
| Bias Supply (VDD) | Separate VDD rail for control circuitry and gate drive |
| Power-OK (POK) Output | Open-drain, asserts when output reaches 92% of nominal, with internal delay |
| Protection Features | Current limit, thermal shutdown |
| Encapsulamento | TO-252-3 (DPAK), surface mount |
| Tipo de montagem | Surface Mount |
Configuração de pinos do GS7133TD-R
| Pino 1 | ADJ/SENSE — Feedback / output voltage sense input for the resistor divider (sets V_OUT via 0.8V internal reference) |
| Pino 2 | VOUT/TAB — Regulated output voltage; exposed tab on DPAK package (verify tab connection against datasheet) |
| Pino 3 | VIN — Unregulated input voltage to the LDO pass transistor |
Aplicações típicas
GS7133TD-R é adequado para 6 aplicaçãos: Point-of-Load Regulation for Networking ASICs, FPGA and DSP Auxiliary Supply, DDR Memory Termination Rail, Industrial PLC and Motor-Driver Logic Supply, Post-Regulator for Noise-Sensitive Analog Blocks, Automotive Infotainment and Telematics Rails.
Point-of-Load Regulation for Networking ASICs
The GS7133TD-R suits 5V-to-3.3V or 3.3V-to-1.8V/1.2V point-of-load rails on networking ASICs and communication SoCs. Its 3A continuous output current handles core and I/O domains on switches, routers, and PHYs from a clean upstream rail, and the 240 mV typical dropout at full load lets the design hold regulation even when the input droops under transient line conditions. Because the part is an LDO it adds zero switching ripple to the rail, which is critical when the same ASIC contains SerDes, PLL, or other noise-sensitive analog blocks that share the supply. Typical application is between the bulk 5V/3.3V rail and the ASIC's VCORE pin, with a 10uF X7R ceramic on the output and 22uF on the input.
Recomendado
FPGA and DSP Auxiliary Supply
The GS7133TD-R is well matched to FPGA and DSP auxiliary rails such as the 1.8V auxiliary, 1.5V DDR termination, or 1.0V-1.2V high-frequency auxiliary domains. Its 3A capability handles the inrush and steady-state load of moderate FPGA bank supplies, and the integrated Power-OK flag simplifies multi-rail sequencing when fed back to the FPGA's PGOOD input. Designers typically place the GS7133 on the same PCB as the main switching converter and use it as a quiet post-regulator for the noise-sensitive PLL supply. The 2.25 MHz control bandwidth delivers sub-microsecond transient response to FPGA logic-driven load steps.
Recomendado
DDR Memory Termination Rail
The GS7133TD-R suits DDR3/DDR4 VTT termination rails where 0.8V-1.2V is generated from a 1.5V or 1.2V bus with tight regulation and high transient current. Its 240 mV dropout at 3A allows VTT to track VDDQ/2 with minimal headroom loss, and the LDO topology eliminates the switching ripple that would otherwise couple into the memory data/clock paths. The Power-OK output can be wired to the memory controller's VTT_SENSE input to gate DRAM training until the GS7133TD-R reports the rail in regulation. Typical application uses 10uF X7R output capacitance and a 4.7uF input capacitor per the GStek reference schematic.
Recomendado
Industrial PLC and Motor-Driver Logic Supply
In factory automation panels, the GS7133TD-R can power 24V-to-5V downstream logic, or 5V-to-3.3V microcontroller and communication rails on PLCs and motor-driver boards. Its 3A continuous output drives multiple downstream loads including microcontroller core, isolated communication transceivers, and logic-level shifters from a single point-of-load regulator. Because the GS7133TD-R is an LDO it is inherently EMI-quiet, which simplifies CE/UL industrial EMC compliance on the PLC sub-board. Engineers should pay attention to dissipation at high 24V-to-5V step-down ratios and consider a pre-regulator to keep junction temperature within safe limits.
Recomendado
Post-Regulator for Noise-Sensitive Analog Blocks
The GS7133TD-R is ideal as a post-regulator following a switching DC-DC converter to strip residual switching ripple from rails powering precision analog blocks such as ADC references, audio DAC analog supplies, or RF front-end LNA/Mixer bias. Because the LDO has high PSRR at low-to-mid frequencies, a single buck+LDO cascade achieves high overall efficiency while delivering clean, low-noise power to the analog section. This topology is common in industrial data-acquisition boards and audio amplifiers where switching noise would otherwise alias into the signal band. The Power-OK flag can be used to sequence the analog block enable after the LDO is in regulation.
Recomendado
Automotive Infotainment and Telematics Rails
The GS7133TD-R can serve as a point-of-load regulator in automotive infotainment head units and telematics control units, powering 3.3V/1.8V rails for SoCs, GNSS modules, and audio codecs from a 5V or 12V pre-regulated bus. Its 3A continuous rating handles the combined current of multiple SoC domains plus the audio DAC, and the LDO topology avoids the conducted EMI that would otherwise need filtering on the automotive harness. Designers should verify the operating temperature range and AEC-Q100 qualification status against the application requirements before deploying in safety-relevant automotive systems.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para GS7133TD-R — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto | GS7133T-R | GS7133TD | GS7133 | AP7173 | LD39300 |
|---|---|---|---|---|---|---|
| Package | TO-252-3 (DPAK) | TO-252-3 (DPAK) - same | TO-252-3 (DPAK) - same | TO-252-3 (DPAK) - same | TO-252-3 (DPAK) - same | TO-252-3 (DPAK) - same |
| Brand | GStek | GStek | GStek | GStek | Diodes Incorporated | STMicroelectronics |
| Output Current | 3 A | 3 A | 3 A | 3 A | 3 A | 3 A |
| Output Voltage Range | 0.8 V to near V_IN (adjustable) | 0.8 V to near V_IN (adjustable) | 0.8 V to near V_IN (adjustable) | 0.8 V to near V_IN (adjustable) | 0.8 V to near V_IN (adjustable) | 0.8 V to near V_IN (adjustable) |
| Pass Element | n-channel MOSFET with separate VDD bias | n-channel MOSFET with separate VDD bias | n-channel MOSFET with separate VDD bias | n-channel MOSFET with separate VDD bias | p-channel MOSFET, single-rail (no separate VDD bias) | n-channel MOSFET with separate VDD bias |
| Internal Reference | 0.8 V | 0.8 V | 0.8 V | 0.8 V | 0.8 V | 0.8 V |
Principais diferenciais
- Separate VDD bias for ultra-low 240 mV dropout at 3A (vs AP7173 (Diodes Incorporated))
- Integrated Power-OK (POK) flag with 92% threshold and built-in delay (vs LD39300 (STMicroelectronics))
- 2.25 MHz control loop bandwidth for fast load-transient response (vs TPS62130 (TI buck converter))
Notas de projeto
Estimated: at V_IN = 5V, V_OUT = 3.3V, and I_OUT = 3A, the GS7133TD-R dissipates (5 - 3.3) x 3 = 5.1 W. DPAK theta_JA is typically 50-70 C/W on 1 oz copper area, which would push junction temperature 255-360 C above ambient - clearly unsustainable. The DPAK tab must be soldered to a copper pour of at least 1 square inch (per JEDEC EIA/JESD51 recommendations for DPAK thermal pad), and for applications with sustained 3A load an external clip-on heatsink is recommended to keep Tj under the 125 C datasheet limit.
Place input and output capacitors as close as physically possible to the GS7133TD-R pins to minimize parasitic loop inductance. Use low-ESR X7R ceramic capacitors: 10uF on the input and 10uF on the output are typical. The exposed DPAK tab must be thermally and electrically connected to the V_OUT node (verify against the datasheet pin drawing) using thermal vias under the pad to inner copper planes for heat spreading.
If the GS7133TD-R uses a separate VDD bias rail (per the GStek datasheet general description), this VDD supply must be present before or coincident with V_IN; otherwise the internal n-channel MOSFET gate cannot be driven and the pass element may conduct uncontrolled body-diode current, damaging the IC or the load. Also, do not exceed the absolute maximum V_IN; verify the maximum V_IN, VDD, and ESD ratings against the datasheet's Absolute Maximum Ratings table before finalizing the design.
Informações de conformidade
RoHS, REACH, AEC-Q100, lead-free, halogen-free, and conflict-minerals status were not stated in the verified web data; field set to 'unknown' per Data Authenticity Rule. Standard commercial-grade LDO; AEC-Q100 not applicable unless an -Q1 automotive suffix variant exists (none found in verified data).
