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TPS77633DR

500mA LDO, 3.3V fixed, 169mV dropout, PG output, enable, SOIC-8

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制造商零件：

TPS77633DR

包装：

SOIC-8 (4.9 x 3.9 x 1.5mm, 1.27mm pitch)

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说明

产品概览

The TPS77633DR is a fast-transient-response, 500mA low-dropout linear regulator from Texas Instruments with fixed 3.3V output, 169mV dropout, power-good output, and enable function in an 8-pin SOIC package.

主要规格

Output Voltage 3.3V fixed (±2% accuracy)
Maximum Output Current 500 mA
Dropout Voltage 169 mV typical at 500mA
输入电压范围 2.7V to 10V
静态电流 85 µA typical (independent of load)
关机电流 1 µA at 25°C
PSRR 60dB at 100Hz
Output Noise 53 µVrms
Load Regulation 3 mV typical
Line Regulation 0.01%/V typical
Control Features Enable, Power Good
工作温度 -40°C to +125°C
包装 SOIC-8 (4.9 x 3.9mm)

特点

  • PMOS pass element for low dropout and low quiescent current
  • 85µA quiescent current independent of output load
  • Fast transient response for demanding digital loads
  • Active-high power-good output for supply monitoring
  • Enable pin with TTL-compatible shutdown control
  • Thermal shutdown and overcurrent protection
  • Stable with 10µF low-ESR output capacitor
  • 2% output voltage tolerance over line, load, and temperature

应用

  • DSP and FPGA core power
  • Battery-powered portable devices
  • USB-powered peripherals
  • Post-regulation for switching supplies
  • Power management for telecom

The TPS77633DR is a 500mA low-dropout linear regulator from Texas Instruments with a fixed 3.3V output. Using a PMOS pass element, the device achieves 169mV typical dropout voltage at 500mA while maintaining an ultralow 85µA quiescent current that is independent of load current. The fast transient response makes it suitable for powering digital ICs with rapidly varying current demands. An active-high power-good (PG) output indicates when the output voltage is within regulation, enabling power sequencing and reset generation. The enable (EN) pin provides shutdown control, reducing quiescent current to 1µA. The device is stable with a 10µF low-ESR output capacitor and features thermal shutdown and overcurrent protection.

The TPS77633DR uses a PMOS transistor as the pass element, which behaves as a voltage-driven device. Unlike PNP-based LDOs where the base current is proportional to load current (IB = IC/β), the PMOS gate draws negligible DC current, resulting in the 85µA quiescent current that remains constant across the entire 0-500mA output range. The dropout voltage is determined by the RDS(ON) of the PMOS transistor: VDO = IOUT × RDS(ON) = 169mV at 500mA. The error amplifier compares a fraction of the output voltage (via the internal resistor divider for fixed-output versions) with a precision bandgap reference, and drives the PMOS gate to maintain regulation. The fast transient response results from the high bandwidth of the error amplifier and the low gate capacitance of the PMOS. The power-good comparator monitors the output voltage and drives the PG pin (open drain, active high) high when VOUT exceeds approximately 90% of the nominal value. In dropout mode, the PMOS gate is driven fully on (100% duty cycle), and unlike PNP LDOs, the quiescent current does not increase, preventing battery drain when the input voltage drops below the regulation threshold.

针脚 名称 类型 说明
1 EN 输入 Enable (TTL high = shutdown, low = normal)
2 IN 电源 Input supply (2.7V-10V)
3 IN 电源 Input supply (2.7V-10V)
4 接地 电源 地面
5 接地 电源 地面
6 出局 电源 3.3V regulated output
7 出局 电源 3.3V regulated output
8 PG 输出 Power good (open drain, active high)
  • DSP/FPGA Power: Fast transient response maintains regulation during rapid load steps from digital core switching
  • Battery Devices: 85µA Iq independent of load extends battery life; 1µA shutdown current in sleep mode
  • USB Peripherals: 169mV dropout at 500mA allows 5V USB input to produce stable 3.3V output
  • Post-Regulation: 60dB PSRR at 100Hz cleans switching supply ripple for noise-sensitive analog circuits
  • Power Sequencing: PG output enables downstream regulators or provides power-on reset to processors
模型 制造商 主要区别 包装 Specs
TPS77601DR TI Adjustable version (1.2V-5.5V), same package - -
TPS77618DR TI 1.8V fixed output version - -
TLV1117LV33DCYR TI 1A LDO, 3.3V, SOT-223, lower cost - -
AMS1117-3.3 Advanced Monolithic 1A LDO, 3.3V, SOT-223, very low cost - -
mic5219-3.3ym5-tr 微型芯片 500mA LDO, 3.3V, SOT-23-5, PG output - -
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Email: info@materialparts.com
Tel / WhatsApp: +86 13760382860
Address: Room 2919, Guoli Building, Huaqiang North, Futian District, Shenzhen, Guangdong, China

 

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Materialparts is a professional global supplier of electronic components with over 20 years of industry experience. We provide one-stop supply of passive components, integrated circuits, as well as parts for industrial control, automotive electronics, consumer electronics and medical devices. Below are the unified shipping and payment policies applicable to all orders, samples and bulk purchases worldwide.

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Contact Information

Email: info@materialparts.com

Tel / WhatsApp: +86 13760382860

服务与包装

Materialparts is a professional electronic component supplier based in Shenzhen, China, with over 20 years of global trading experience. We integrate component procurement, quality inspection, technical support, customized packaging, and global delivery services to provide one-stop supply chain solutions. Our business covers industrial control, automotive electronics, consumer electronics, medical devices and other industries. We always adhere to genuine sources, stable supply and considerate after-sales service.

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Contact Information

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Tel / WhatsApp: +86 13760382860
Address: Room 2919, Guoli Building, Huaqiang North, Futian District, Shenzhen, Guangdong, China
 

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