AS1359-BTTT-28

AS1359-BTTT-28 Datasheet


AS1358/AS1359

Part Datasheet
AS1359-BTTT-28 AS1359-BTTT-28 AS1359-BTTT-28 (pdf)
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Datasheet

AS1358/AS1359
150mA/300mA, Ultra-Low-Noise, High-PSRR Low Dropout Regulators
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, smallcapacitance ceramic capacitors.

The devices are available as the standard products listed in Table

Table Standard Products

Model Load Current

Output Voltage

AS1358
150mA

Preset to 4.5V

AS1359
300mA

Preset to 4.5V
! Preset Output Voltages 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, current 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 accessories, wireless LANs, digital cameras, personal audio devices, and any other portable, battery-powered application.

Figure Typical Application Circuit

Input 2V to 5.5V

CIN 1µF
2 AS1358/ GND AS1359

Output 1.5V to 4.5V

SHDNN

CBYPASS
10nF

BYPASS

COUT 1µF
1 - 14

AS1358/AS1359

Datasheet - Pinout
4 Pinout

Pin Assignments

Figure Pin Assignments Top View
The AS1358/AS1359 deliver preset output voltages from to 4.5V, in 50mV increments see Ordering Information on page

Shutdown

The AS1358/AS1359 feature a low-power shutdown mode that reduces quiescent current to <200nA. Driving SHDNN low disables the internal voltage reference, error amplifier, gate-drive circuitry, and P-channel MOSFET pass transistor see Figure 18 , and the device output enters a high-impedance state.

Note For normal operation connect pin SHDNN to pin IN.

Figure AS1358/AS1359 Block Diagram

AS1358/AS1359

SHDNN

Shutdown and Power-Down

Control

Thermal Sensor

Error Amp

MOS Driver w/

ILIMIT

BYPASS

Reference and Noise Bypass
9 - 14

AS1358/AS1359

Datasheet - Detailed Description

Current Limit

The AS1358/AS1359 include a current limiting circuitry to monitor and control the P-channel MOSFET pass transistor’s gate voltage, thus limiting the device output current to 270mA AS1358 and 510mA AS1359 .

Note See Table 4 on page 4 for the recommended min and max current limits. The output can be shorted to ground indefinitely without causing damage to the device.

Thermal Protection

Integrated thermal protection circuitry limits total power dissipation in the AS1358/AS1359. When the junction temperature TJ exceeds +160ºC, the thermal sensor signals the shutdown logic, turning off the P-channel MOSFET pass transistor and allowing the device to cool down. The thermal sensor turns the pass transistor on again after the device’s junction temperature drops by 10ºC, resulting in a pulsed output during continuous thermal-overload conditions.

Note Thermal protection is designed to protect the devices in the event of fault conditions. For continuous operation, do not exceed the absolute maximum junction temperature rating of +150ºC.

Operating Region and Power Dissipation

The AS1358/AS1359 maximum power dissipation is dependant on the thermal resistance of the case and PCB, the
temperature difference between the die junction and TAMB, and airflow rate.

Power dissipation across the device is calculated as:

PD = IOUT VIN - VOUT

The maximum power dissipation is calculated:

PDMAX = TJ - +

Where TJ - TAMB is the temperature difference between the AS1358/AS1359 die junction and the surrounding air is the thermal resistance of the package;
is the thermal resistance through the PC board/copper traces/other materials to the surrounding air.

Note Pin GND of the AS1358/AS1359 provides the electrical connection to system ground and also serves as a heat sink. Connect pin GND to the system ground using a large pad or ground plane.

Noise Reduction

The AS1358/AS1359 noise bypass circuitry dramatically reduces output noise, exhibiting 9µVRMS of output voltage noise with CBYPASS = 0.01µF and COUT = 1µF. Use an external 0.01µF bypass capacitor between pin BYPASS and pin OUT see Figure 1 on page

Note Startup time is minimized by internal power-on circuitry which pre-charges CBYPASS.
10 - 14

AS1358/AS1359

Datasheet - Application Information
9 Application Information
Datasheet - Ordering Information
11 Ordering Information

The devices are available as the standard products shown in Table
Table Ordering Information Ordering Code Marking AS1358-BTTT-15 ASLI AS1358-BTTT-18 ASLJ AS1358-BTTT-25 ASLK AS1358-BTTT-26 ASLL AS1358-BTTT-27 ASLM AS1358-BTTT-28 ASLN

AS1358-BTTT-285 ASLO AS1358-BTTT-30 ASLP AS1358-BTTT-33 ASLQ AS1358-BTTT-45 ASLR AS1359-BTTT-15 ASLS AS1359-BTTT-18 ASLT AS1359-BTTT-25 ASLU AS1359-BTTT-26 ASLV AS1359-BTTT-27 ASLW AS1359-BTTT-28 ASLX AS1359-BTTT-285 ASLY AS1359-BTTT-30 ASLZ AS1359-BTTT-31 ASSA AS1359-BTTT-33 ASL0 AS1359-BTTT-45 ASL1

Output Current 150mA 300mA

Output Voltage 1.5V 1.8V 2.5V 2.6V 2.7V 2.8V 2.85V 3.0V 3.3V 4.5V 1.5V 1.8V 2.5V 2.6V 2.7V 2.8V 2.85V 3.0V 3.1V 3.3V 4.5V

Delivery Form Package Tape and Reel TSOT23 5-pin Tape and Reel TSOT23 5-pin Tape and Reel TSOT23 5-pin Tape and Reel TSOT23 5-pin Tape and Reel TSOT23 5-pin Tape and Reel TSOT23 5-pin Tape and Reel TSOT23 5-pin Tape and Reel TSOT23 5-pin Tape and Reel TSOT23 5-pin Tape and Reel TSOT23 5-pin Tape and Reel TSOT23 5-pin Tape and Reel TSOT23 5-pin Tape and Reel TSOT23 5-pin Tape and Reel TSOT23 5-pin Tape and Reel TSOT23 5-pin Tape and Reel TSOT23 5-pin Tape and Reel TSOT23 5-pin Tape and Reel TSOT23 5-pin Tape and Reel TSOT23 5-pin Tape and Reel TSOT23 5-pin Tape and Reel TSOT23 5-pin

Non-standard devices from 1.5V to 4.5V are available in 50mV steps. For more information and inquiries contact

Note All products are RoHS compliant and Pb-free. Buy our products or get free samples online at ICdirect:

For further information and requests, please contact us or find your local distributor at
13 - 14

AS1358/AS1359

Datasheet

Copyrights

Copyright 1997-2009, austriamicrosystems AG, Tobelbaderstrasse 30, 8141 Unterpremstaetten, Austria-Europe. Trademarks Registered All rights reserved. The material herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of the copyright owner. All products and companies mentioned are trademarks or registered trademarks of their respective companies.

Disclaimer

Devices sold by austriamicrosystems AG are covered by the warranty and patent indemnification provisions appearing in its Term of Sale. austriamicrosystems AG makes no warranty, express, statutory, implied, or by description regarding the information set forth herein or regarding the freedom of the described devices from patent infringement. austriamicrosystems AG reserves the right to change specifications and prices at any time and without notice. Therefore, prior to designing this product into a system, it is necessary to check with austriamicrosystems AG for current information. This product is intended for use in normal commercial applications. Applications requiring extended temperature range, unusual environmental requirements, or high reliability applications, such as military, medical life-support or life-sustaining equipment are specifically not recommended without additional processing by austriamicrosystems AG for each application. For shipments of less than 100 parts the manufacturing flow might show deviations from the standard production flow, such as test flow or test location. The information furnished here by austriamicrosystems AG is believed to be correct and accurate. However, austriamicrosystems AG shall not be liable to recipient or any third party for any damages, including but not limited to personal injury, property damage, loss of profits, loss of use, interruption of business or indirect, special, incidental or consequential damages, of any kind, in connection with or arising out of the furnishing, performance or use of the technical data herein. No obligation or liability to recipient or any third party shall arise or flow out of austriamicrosystems AG rendering of technical or other services.

Contact Information

Headquarters austriamicrosystems AG Tobelbaderstrasse 30 A-8141 Unterpremstaetten, Austria Tel +43 0 3136 500 0 Fax +43 0 3136 525 01

For Sales Offices, Distributors and Representatives, please visit:
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Datasheet ID: AS1359-BTTT-28 519616