AS1358 Datasheet, PDF (1/2 Pages) ams AG – 150mA/300mA, Ultra-Low-Noise, High-PSRR Low Dropout Regulators

AS1358/AS1359
150mA/300mA, Ultra-Low-Noise, High-PSRR
Low Dropout Regulators
Product Brief
1 General Description
2 Key Features
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 Load Current
Output Voltage
AS1358
150mA
Preset – 1.5 to 4.5V
AS1359
300mA
Preset – 1.5 to 4.5V
! 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 @ 300mA Load
! 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
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 9µVRMS 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, cur-
rent consumption drops below 500nA.
The devices are available in a TSOT23 5-pin package.
! 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 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
CIN
1µF
1
5
IN
OUT
2 _AS1358/
GND AS1359
Output
1.5 to 4.5V
On
3
Off _SHDNN
CBYPASS
4
10nF
BYPASS
COUT
1µF
IN 1
5 OUT
AS1358/
GND 2 _AS1359
SHDNN 3
4 BYPASS
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Revision 1.00
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