7 Detailed Description

7.1 Overview

The TLV704 low-dropout regulator (LDO) consumes only 3.4 μA of quiescent current across the entire output

current range, and offers a wide input voltage range and low-dropout voltage in a small package. The device,

which operates over an input range of 2.5 V to 24 V, is stable with any output capacitor greater than or equal

to 0.47 μF. The low quiescent current across the complete load current range makes the TLV704 designed

for powering battery-operated applications. The TLV704 has internal soft-start to control inrush current into the

output capacitor. This LDO also has overcurrent protection during a load-short or fault condition on the output.

7.2 Functional Block Diagram

Bandgap

Reference

Current

Sense

Leakage Null

Control Circuit

GND

ILIM

VREF = 1.205 V

GND

GND

V(IN)

V(OUT)

GND

7.3 Feature Description

7.3.1 Wide Supply Range

This device has an operational input supply range of 2.5 V to 24 V, allowing for a wide range of applications. This

wide supply range is designed for applications that have either large transients or high DC voltage supplies.

7.3.2 Low Quiescent Current

This device only requires 3.4 μA (typical) of quiescent current across the complete load current range (0 mA to

150 mA) and has a maximum current consumption of 4.5 μA (for new device only) at –40°C to +125°C.

7.3.3 Dropout Voltage (VDO)

Dropout voltage (VDO) is defined as the input voltage minus the output voltage (VIN – VOUT) at the rated output

current (IRATED), where the pass transistor is fully on. IRATED is the maximum IOUT listed in the Recommended

Operating Conditions table. In dropout operation, the pass transistor is in the ohmic or triode region of operation,

and acts as a switch. The dropout voltage indirectly specifies a minimum input voltage greater than the nominal

programmed output voltage at which the output voltage is expected to stay in regulation. If the input voltage falls

to less than the value required to maintain output regulation, the output voltage falls as well.

For a CMOS regulator, the dropout voltage is determined by the drain-source, on-state resistance (RDS(ON)) of

the pass transistor. Therefore, if the linear regulator operates at less than the rated current, the dropout voltage

for that current scales accordingly. Use Equation 1 to calculate the RDS(ON) of the device.

RDSON =  VDOIRATED

(1)

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TLV704

SBVS148E – SEPTEMBER 2010 – REVISED DECEMBER 2022

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