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AS1353

Linear Low-Dropout 150mA Voltage Regulators

austriamicrosystems AG 

AS1353/AS1356

Data Sheet - Typical Application

9 Typical Application

Figure 13. Typical Application Diagrams

+2.5 to

IN

OUT

Preset Output

1.5 to 3.6V,

+2.5 to

IN

OUT

Preset Output

1.5 to 3.6V,

+5.5V

CIN

1µF

AS1353

lid On

Off

CBP

0.01µF

SHDNM

BP

GND

COUT 150mA

1µF

+5.5V

CIN

1µF

On

Off

AS1356

SHDNM

GND POK

COUT 150mA

1µF

100kΩ

To Micro-

processor

ill va Capacitor Selection and Regulator Stability

Ceramic capacitors are highly recommended as they offer distinct advantages over their tantalum and aluminum elec-

t trolytic components.

For stable operation with load currents up to 150mA over the entire device temperature range, use a 1µF (min)

G s ceramic output capacitor with an ESR <0.2Ω.

Use large output capacitor values (10µF max) to reduce noise and improve load transient-response, stability and

A t power-supply rejection.

s n Note: Some ceramic capacitors exhibit large capacitance and ESR variations with variations in temperature. Z5U

and Y5V capacitors may be required to ensure stability at temperatures below TAMB = -10ºC. With X7R or X5R

e capacitors, a 1µF capacitor should be sufficient at all operating temperatures.

m t Power Supply Rejection Ratio

a n The AS1353/AS1356 are designed to deliver low dropout voltages and low quiescent currents. Power-supply rejection

is 60dB (typ) at low frequencies. To improve power supply-noise rejection and transient response, increase the values

o of the input and output bypass capacitors (see Figure 13).

The Typical Operating Characteristics (page 6) show the device line- and load-transient responses. See the Power-

c Supply Rejection Ratio vs. Frequency graph in the Typical Operating Characteristics section (page 6) for further

details.

al Dropout Voltage

For standard products with output voltage greater than the minimum VIN (2.5V), the minimum input-output voltage dif-

ic ferential (dropout voltage) determines the lowest usable supply voltage. This determines the useful end-of-life battery

voltage in battery-powered systems.

The dropout voltage is a function of the P-MOSFET drain-to-source on-resistance multiplied by the load current, and is

n calculated by:

h VDROPOUT = VIN - VOUT = RDS(ON) x IOUT

c Where:

RDS(ON) is the drain-to-source on-resistance.

e IOUT is the supply current.

TSee Typical Operating Characteristics (page 6) for further information.

(EQ 3)

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