AS1361/AS1362
150mA/300mA, Ultra-Low-Noise, High-PSRR
Low Dropout Regulators, with POK
www.austriamicrosystems.com Revision 1.03 1 - 15
Datasheet
1 General Description
The AS1361/AS1362 are ultr a-low-noise, low-dropout
linear regulators specifically designed to deliver up to
150/300mA continuous output current, an d 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 prod ucts
listed in Table 1.
An integrated P-channel MOSFET pass transistor allows
the devices to maintain extremely low quiescent current
(40µA).
The AS1361/AS1362 uses an advanced architectu re to
achieve ultra-low output voltage noise of 9µV
RMS and a
power-supply rejecti on-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.
Figure 1. Typical Application Circuit
2 Key Features
! Preset Output Voltages: 1.5 to 4.5V (in 50mV steps)
! Output Noise: 9µVRMS @ 100Hz to 100kHz
! Power-Supply Rejection Ratio: 92dB @ 1kHz
! Low Dropout: 140mV @ 300 mA 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
3 Applications
The devices are ideal for mobile phones, wireless
phones, PDAs, handheld computers, mobile ph one
base stations, Bluetooth portable radios and accesso-
ries, wireless LANs, digital cameras, personal audio
devices, and any other portable, battery-powered ap pli-
cation.
Table 1. Standard Products
Model Load Current Output Voltage
AS1361 150mA Preset – 1.5 to 4.5V
AS1362 300mA Preset – 1.5 to 4.5V
AS1361/
AS1362
5
BYPASS
2
GND
1
IN
6
OUT
3
SHDNN
CIN
1µF
On
Off
Input
2 to 5.5V
COUT
1µF
Output
1.5 to 4.5V
C
BYPASS
10nF
4
POK
100kΩ
3SHDNN
2
GND
1IN
4POK
6OUT
AS1361/
AS1362
5
BYPASS