Datasheet
AS1358 / AS1359
1 5 0 m A / 3 0 0 m A , U l t r a -L o w - N o i s e , H i g h - P S R R L o w D r o p o u t R e g u l a t o r s
1 General Description
The AS1358 / AS1359 are ultra-low-noise, low-dropout linear
regulators specifically designed to deliver up to 150/300mA
continuous output current, and can achieve a low 140mV dropout for
300mA load current. The LDOs are designed and optimized to work
with low-cost, small-capacitance ceramic capacitors.
The devices are available as the standard products listed in
Table 1.
Table 1. Standard Products
Model
AS1358
AS1359
Load Current
150mA
300mA
Output Voltage
Preset – 1.5V to 4.5V
Preset – 1.5V to 4.5V
2 Key Features
Preset Output Voltages: 1.5V to 4.5V (in 50mV steps)
Output Noise:
9µV
RMS
@ 100Hz to 100kHz
Power-Supply Rejection Ratio: 92dB @ 1kHz
Low Dropout: 140mV @ 300mA Load
Guaranteed 150mA / 300mA Output
1.25V Internal Reference
An integrated P-channel MOSFET pass transistor allows the devices
to maintain extremely low quiescent current (40µA).
The AS1358 / AS1359 uses an advanced architecture to achieve
ultra-low output voltage noise of 9µV
RMS
and a power-supply
rejection-ratio of better than 80dB (up to 10kHz).
The AS1358 / AS1359 requires only 1µF output capacitor for stability
at any load. When the LDO is disabled, current consumption drops
below 500nA.
The devices are available in a TSOT23 5-pin package.
Figure 1. Typical Application Circuit
Te
c
www.austriamicrosystems.com
hn
ic a
al m
co s
A
nt G
en
ts
til
Extremely-Low Quiescent Current: 40µA
Excellent Load/Line Transient
Overcurrent and Thermal Protection
TSOT23 5-pin Package
3 Applications
The devices are ideal for mobile phones, wireless phones, PDAs,
handheld computers, mobile phone base stations, Bluetooth portable
radios and accessories, wireless LANs, digital cameras, personal
audio devices, and any other portable, battery-powered application.
Input
2V to 5.5V
1
5
Output
1.5V to 4.5V
C
IN
1µF
IN
OUT
2
AS1358 / AS1359
GND
On
Off
3
SHDNN
4
C
BYPASS
10nF
C
OUT
1µF
BYPASS
Revision 1.5
lv
1 - 16
Stable with 1µF Ceramic Capacitor for any Load
al
id
AMSCO [ AUSTRIAMICROSYSTEMS AG ]
