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TPS76701QDR

1A adjustable LDO with 230mV dropout, 85µA Iq, and 200-ms RESET delay in 8-SOIC

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Pieza del fabricante：

TPS76701QDR

Paquete：

8-SOIC (5.0 x 3.98 x 1.5 mm)

Marca：
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Descripción

Productos

The TPS76701QDR is a fast-transient-response 1-A low-dropout (LDO) linear regulator from Texas Instruments, available in an adjustable output version programmable from 1.5 V to 5.5 V via an external resistor divider. Housed in an 8-pin SOIC package, it features an ultra-low quiescent current of 85 µA typical and an open-drain RESET output with a 200-ms delay for power-on reset supervision, making it ideal for battery-powered and DSP/FPGA core supply applications.

Especificaciones

Output Type Adjustable (1.5 V to 5.5 V)
Maximum Output Current 1 A
Input Voltage Range 2.7 V to 10 V
Dropout Voltage 230 mV typical @ 1 A
Corriente de reposo 85 µA typical
Accuracy ±2% over line, load, and temperature
PSRR 60 dB @ 1 kHz
Output Noise 55 µVrms
RESET Delay 200 ms typical
Temperatura de funcionamiento -40°C to 125°C
Paquete 8-SOIC

Características

  • Ultra-low 85 µA typical quiescent current independent of output load
  • Fast transient response with 10 µF low-ESR output capacitor stability
  • Open-drain power-on reset (RESET) output with 200-ms delay for microprocessor supervision
  • Sleep mode: TTL high on EN pin reduces quiescent current to 1 µA
  • Thermal shutdown protection and over-current limiting
  • PMOS pass element enables very low dropout and ground-current independence from load

Aplicaciones

  • Battery-powered DSP and microcontroller core supply rails
  • Portable instrumentation and handheld devices requiring long battery life
  • FPGA and CPLD I/O and core voltage regulation
  • Post-regulation for switch-mode power supplies
  • Automotive and industrial systems needing RESET supervision

The TPS76701QDR from Texas Instruments is a member of the TPS767xxQ family of fast-transient-response 1-A low-dropout linear regulators. The adjustable version allows the output voltage to be set from 1.5 V to 5.5 V using an external resistor divider, with a reference voltage of 1.1834 V typical. The device is built with a PMOS pass transistor that provides very low dropout voltage (230 mV typical at 1 A for the 5-V version) and maintains quiescent current at just 85 µA across the entire output current range, significantly extending battery life in portable applications. An integrated undervoltage comparator drives an open-drain RESET output with a 200-ms delay, enabling reliable microprocessor power-on reset supervision.

The TPS76701QDR operates through three functional blocks: (1) PMOS Pass Element — a P-channel MOSFET configured as a voltage-controlled resistor regulates the output, with dropout voltage directly proportional to output current since the PMOS behaves as a low-value resistor; (2) Error Amplifier and Feedback — the adjustable version uses an external resistor divider to set the output voltage, with the error amplifier comparing the divided output against an internal 1.1834 V bandgap reference and driving the PMOS gate to maintain regulation; (3) Supervisory Circuit — an internal comparator monitors the output voltage and asserts the open-drain RESET output low when the output drops below the threshold, releasing it after a 200-ms timeout once the output returns above the valid level. The enable (EN) pin can place the device into sleep mode, reducing quiescent current to 1 µA.

Pin Nombre Función
1 GND Referencia del suelo
2 ES Enable input (active high; TTL high = sleep mode shutdown)
3 EN Input voltage supply
4 EN Input voltage supply
5 OUT Regulated output voltage
6 OUT Regulated output voltage
7 FB Feedback input for adjustable version (connect resistor divider)
8 RESET Open-drain power-on reset output (active low, 200-ms delay)
  • Battery-powered DSP core supply providing 1.8 V at 1 A from a 3.3 V rail with RESET supervision
  • Portable medical instrument requiring ultra-low quiescent current for extended battery life
  • FPGA development board with adjustable core voltage (1.2 V to 3.3 V) and power-on reset
  • Post-regulation of a 5 V switching converter to a clean 3.3 V rail with 60 dB PSRR
  • Industrial control system with thermal shutdown protection and microprocessor watchdog reset
Modelo Fabricante Diferencia clave
TPS76701QD TI Same device, cut-tape packaging
TPS76801QDR TI Same family with Power-Good (PG) instead of RESET
TPS76733QDR TI Fixed 3.3 V output version
TLV1117-ADJ TI Lower cost 800 mA LDO, no RESET
AMS1117-ADJ Advanced Monolithic Systems Budget alternative 1 A LDO without supervisor
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