AS1358/AS1359

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

Low Dropout Regulators

Produ ct Brief

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Revision 1.00

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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

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

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.

Figure 1. Typical Application Circuit

2 Key Features

!

Preset Output Voltages: 1.5 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 150/300mA 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 accesso-

ries, wireless LANs, digital cameras, personal audio

devices, and any other portable, battery-powered appli-

cation.

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

AS1358/

AS1359

4

BYPASS

2

GND

1

IN

5

OUT

3

SHDNN

1µF

On

Off

Input

2 to 5.5V

1µF

Output

1.5 to 4.5V

10nF

3

SHDNN

2

GND

1

IN

4 BYPASS

5OUT

AS1358/

AS1359