austriamicrosystems AG
is now
ams AG
The technical content of this austriamicrosystems datasheet is still valid.
Contact information:
Headquarters:
ams AG
Tobelbaderstrasse 30
8141 Unterpremstaetten, Austria
Tel: +43 (0) 3136 500 0
e-Mail: ams_sales@ams.com
Please visit our website at www.ams.com
Datasheet
AS1358 / AS1359
150mA/300mA, Ultra-Low-Noise, High-PSRR Low Dropout Regulators
1 General Description 2 Key Features
Preset Output Voltages: 1.5V to 4.5V (in 50mV steps)
The AS1358 / AS1359 are ultra-low-noise, low-dropout linear
regulators specifically designed to deliver up to 150/300mA
Output Noise: 9VRMS @ 100Hz to 100kHz
continuous output current, and can achieve a low 140mV dropout for
300mA load current. The LDOs are designed and optimized to work
Power-Supply Rejection Ratio: 92dB @ 1kHz
with low-cost, small-capacitance ceramic capacitors.
Low Dropout: 140mV @ 300mA Load
The devices are available as the standard products listed in Table 1.
Table 1. Standard Products Stable with 1F Ceramic Capacitor for any Load
Model Load Current Output Voltage
Guaranteed 150mA / 300mA Output
AS1358 150mA Preset 1.5V to 4.5V
1.25V Internal Reference
AS1359 300mA Preset 1.5V to 4.5V
Extremely-Low Quiescent Current: 40A
An integrated P-channel MOSFET pass transistor allows the devices
Excellent Load/Line Transient
to maintain extremely low quiescent current (40A).
Overcurrent and Thermal Protection
The AS1358 / AS1359 uses an advanced architecture to achieve
ultra-low output voltage noise of 9VRMS and a power-supply
TSOT23 5-pin Package
rejection-ratio of better than 80dB (up to 10kHz).
The AS1358 / AS1359 requires only 1F output capacitor for stability
3 Applications
at any load. When the LDO is disabled, current consumption drops
below 500nA.
The devices are ideal for mobile phones, wireless phones, PDAs,
handheld computers, mobile phone base stations, Bluetooth portable
The devices are available in a TSOT23 5-pin package.
radios and accessories, wireless LANs, digital cameras, personal
audio devices, and any other portable, battery-powered application.
Figure 1. Typical Application Circuit
Input
Output
2V to 5.5V
1 5 1.5V to 4.5V
IN OUT
CIN
1F
2
AS1358 / AS1359
GND
CBYPASS
10nF
4
3
On
Off
BYPASS COUT
SHDNN
1F
www.austriamicrosystems.com Revision 1.5 1 - 16
ams AG
Technical content still valid