Data Sheet
AS1361/AS1362
150mA/300mA, Ultra-Low-Noise, High-PSRR
Low Dropout Regulators, with POK
1 General Description
2 Key Features
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Preset Output Voltages: 1.5 to 4.5V (in 50mV steps)
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.
Output Noise: 9µVRMS @ 100Hz to 100kHz
Power-Supply Rejection Ratio: 92dB @ 1kHz
Low Dropout: 140mV @ 300mA Load
Power-OK Output
The devices are available as the standard products
listed in Table 1.
Stable with 1µF Ceramic Capacitor for any Load
Guaranteed 150/300mA Output
1.25V Internal Reference
Table 1. Standard Products
Model
AS1361
AS1362
Load Current
150mA
Output Voltage
Preset – 1.5 to 4.5V
Preset – 1.5 to 4.5V
300mA
Extremely-Low Quiescent Current: 40µA
Excellent Load/Line Transient
An integrated P-channel MOSFET pass transistor allows
the devices to maintain extremely low quiescent current
(40µA).
Overcurrent and Thermal Protection
TSOT23 6-pin Package
The AS1361/AS1362 uses an advanced architecture to
achieve ultra-low output voltage noise of 9µVRMS and a
power-supply rejection-ratio of better than 80dB (up to
10kHz).
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.
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
Input
2 to 5.5V
Output
1.5 to 4.5V
1
6
IN
OUT
IN
GND
1
2
3
6
5
4
OUT
CIN
1µF
100kΩ
3
AS1361/
AS1362
4
On
Off
AS1361/
AS1362
BYPASS
POK
SHDNN
POK
CBYPASS
10nF
SHDNN
5
2
BYPASS
COUT
1µF
GND
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