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MAX1735
(Rev.:2000)

200mA, Negative-Output, Low-Dropout Linear Regulator in SOT23

Maxim Integrated 

200mA, Negative-Output, Low-Dropout

Linear Regulator in SOT23

Noise, PSRR, and Transient Response

MAX1735 output noise is typically 160µVRMS. This is

suitably low for most applications. See the Output

Noise vs. Frequency plot in the Typical Operating

Characteristics.

The MAX1735 is optimized for battery-powered equip-

ment, with low dropout voltage and low quiescent cur-

rent. It maintains good transient response, AC rejection,

and noise characteristics even near dropout. See

Power-Supply Rejection Ratio vs. Frequency in the

Typical Operating Characteristics. When operating

from very noisy sources, supply noise rejection and

transient response can be improved by increasing the

input and output capacitance, and by employing pas-

sive postfiltering.

Dropout Voltage

A regulator’s minimum input-to-output voltage differen-

tial dropout voltage determines the lowest usable sup-

ply voltage for an application. In battery-powered

systems, this determines the useful end-of-life battery

voltage. Since the MAX1735’s pass element is an

N-channel MOSFET, dropout voltage is the product of

RDS(ON) and the load current; see Electrical

Characteristics and Dropout Voltage vs. Load Current

in the Typical Operating Characteristics for details. The

MAX1735 operating (ground pin) current typically

remains below 125µA at full load in dropout.

___________________Chip Information

TRANSISTOR COUNT: 293

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