AS1361/AS1362
150mA/300mA, Ultra-Low-Noise, High-PSRR
Low Dropout Regulators, with POK
D a ta S he e t
1 General Description
The AS1361/AS1362 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. Standard Products
Model
AS1361
AS1362
Load Current
150mA
300mA
Output Voltage
Preset – 1.5 to 4.5V
Preset – 1.5 to 4.5V
2 Key Features
!
!
!
!
!
!
!
!
!
!
!
!
Preset Output Voltages: 1.5 to 4.5V (in 50mV steps)
Output Noise: 9µV
RMS
@ 100Hz to 100kHz
Power-Supply Rejection Ratio: 92dB @ 1kHz
Low Dropout: 140mV @ 300mA Load
Power-OK Output
Stable with 1µF Ceramic Capacitor for any Load
Guaranteed 150/300mA Output
1.25V Internal Reference
Extremely-Low Quiescent Current: 40µA
Excellent Load/Line Transient
Overcurrent and Thermal Protection
TSOT23 6-pin Package
An integrated P-channel MOSFET pass transistor allows
the devices to maintain extremely low quiescent current
(40µA).
The AS1361/AS1362 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).
An active-Low, open-drain power-ok output indicates if
the output voltage is within regulation.
The AS1361/AS1362 requires only 1µF output capacitor
for stability at any load. When the LDO is disabled, cur-
rent consumption drops below 500nA.
The devices are available in a TSOT23 6-pin package.
3 Applications
The devices are ideal for mobile phones, wireless
phones, PDAs, handheld computers, mobile phone
base stations, Bluetooth portable radios and accesso-
ries, wireless LANs, digital cameras, personal audio
devices, and any other portable, battery-powered appli-
cation.
Figure 1. Typical Application Circuit
Input
2 to 5.5V
C
IN
1µF
1
IN
6
OUT
Output
1.5 to 4.5V
IN 1
100kΩ
6 OUT
On
Off
3
SHDNN
AS1361/
AS1362
4
POK
GND 2
AS1361/
AS1362
5 BYPASS
2
GND
5
BYPASS
C
BYPASS
10nF
C
OUT
1µF
SHDNN 3
4 POK
www.austriamicrosystems.com
Revision 1.00
1 - 13
AMSCO [ AUSTRIAMICROSYSTEMS AG ]
