AS1358 / AS1359

150mA/300mA, Ultra-Low-Noise, High-PSRR Low Dropout Regulators

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Revision 1.5

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Datasheet

1 General Description

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.

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

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, current consumption drops

below 500nA.

The devices are available in a TSOT23 5-pin package.

Figure 1. Typical Application Circuit

2 Key Features



Preset Output Voltages: 1.5V to 4.5V (in 50mV steps)





Power-Supply Rejection Ratio: 92dB @ 1kHz



Low Dropout: 140mV @ 300mA Load



Stable with 1µF Ceramic Capacitor for any Load



Guaranteed 150mA / 300mA Output



1.25V Internal Reference



Extremely-Low Quiescent Current: 40µA



Excellent Load/Line Transient



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 accessories, wireless LANs, digital cameras, personal

audio devices, and any other portable, battery-powered application.

Table 1. Standard Products

Model

Load Current

Output Voltage

AS1358

150mA

Preset – 1.5V to 4.5V

AS1359

300mA

Preset – 1.5V to 4.5V

AS1358 / AS1359

4

BYPASS

2

GND

1

IN

5

OUT

3

SHDNN

1µF

On

Off

Input

2V to 5.5V

1µF

Output

1.5V to 4.5V

10nF