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TPS77633DR

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

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Manufacturer Part：

TPS77633DR

Package：

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

Brand：

Product Categories：

Integrated Circuits ICs, Low Dropout Regulators (LDO)

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Description

Product Overview

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.

Key Specifications

Output Voltage	3.3V fixed (±2% accuracy)
Maximum Output Current	500 mA
Dropout Voltage	169 mV typical at 500mA
Input Voltage Range	2.7V to 10V
Quiescent Current	85 µA typical (independent of load)
Shutdown Current	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
Operating Temperature	-40°C to +125°C
Package	SOIC-8 (4.9 x 3.9mm)

Features

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

Applications

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

Product Introduction:TPS77633DR Product Introduction

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.

Working Principle:TPS77633DR Working Principle

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.

Pin Description:TPS77633DR Pin Definition and Functions

Pin	Name	Type	Description
1	EN	Input	Enable (TTL high = shutdown, low = normal)
2	IN	Power	Input supply (2.7V-10V)
3	IN	Power	Input supply (2.7V-10V)
4	GND	Power	Ground
5	GND	Power	Ground
6	OUT	Power	3.3V regulated output
7	OUT	Power	3.3V regulated output
8	PG	Output	Power good (open drain, active high)

Application Scenarios:In which products and applications isTPS77633DR used

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

Alternative Models:What chips are recommended as replacements for TPS77633DR

Model	Manufacturer	Key Difference	Package	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	Microchip	500mA LDO, 3.3V, SOT-23-5, PG output	–	–