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AS1353 Datasheet(PDF) 11 Page - ams AG

Part # AS1353
Description  Linear Low-Dropout 150mA Voltage Regulators
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Manufacturer  AMSCO [ams AG]
Direct Link  http://www.ams.com
Logo AMSCO - ams AG

AS1353 Datasheet(HTML) 11 Page - ams AG

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www.austriamicrosystems.com
Revision 1.03
10 - 13
AS1353/AS1356
Data Sheet - Ty pi c al Ap p l ic at i on
9 Typical Application
Figure 13. Typical Application Diagrams
Capacitor Selection and Regulator Stability
Ceramic capacitors are highly recommended as they offer distinct advantages over their tantalum and aluminum elec-
trolytic components.
For stable operation with load currents up to 150mA over the entire device temperature range, use a 1µF (min)
ceramic output capacitor with an ESR <0.2
Ω.
Use large output capacitor values (10µF max) to reduce noise and improve load transient-response, stability and
power-supply rejection.
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
capacitors, a 1µF capacitor should be sufficient at all operating temperatures.
Power Supply Rejection Ratio
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
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-
Supply Rejection Ratio vs. Frequency graph in the Typical Operating Characteristics section (page 6) for further
details.
Dropout Voltage
For standard products with output voltage greater than the minimum VIN (2.5V), the minimum input-output voltage dif-
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
calculated by:
VDROPOUT = VIN - VOUT = RDS(ON) x IOUT
(EQ 3)
Where:
RDS(ON) is the drain-to-source on-resistance.
IOUT is the supply current.
See Typical Operating Characteristics (page 6) for further information.
AS1356
SHDNM
IN
OUT
POK
CIN
1µF
+2.5 to
+5.5V
COUT
1µF
100k
Ω
On
Off
Preset Output
1.5 to 3.6V,
150mA
To Micro-
processor
AS1353
BP
CBP
0.01µF
SHDNM
IN
OUT
CIN
1µF
+2.5 to
+5.5V
COUT
1µF
On
Off
Preset Output
1.5 to 3.6V,
150mA
GND
GND


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