AS1367-BTDT-33

AS1367-BTDT-33 Datasheet


AS1367

Part Datasheet
AS1367-BTDT-33 AS1367-BTDT-33 AS1367-BTDT-33 (pdf)
Related Parts Information
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AS1367-BTDT-30 AS1367-BTDT-30 AS1367-BTDT-30
AS1367-BTDT-18 AS1367-BTDT-18 AS1367-BTDT-18
AS1367-BTDT-45 AS1367-BTDT-45 AS1367-BTDT-45
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Datasheet

AS1367
150mA, Adaptive Low Drop-Out Linear Regulator
1 General Description

The AS1367 is a precise, low noise, high speed, low dropout regulator with adaptive operation. Features included are high ripple rejection and low dropout voltage, a reference voltage source, an error amplifier and a current limiter.

The AS1367 provides high speed operation, low power consumption and high efficiency by automatically switching between a light load and a heavy load mode depending upon the output current level.

The EN function enables the output to be turned off, while the electric charge at the output capacitor is discharged via the internal auto-discharge resistance, and as a result the VOUT pin quickly returns to the GND level.

Furthermore a Bypass Pin is included to reduce noise. The device features integrate short-circuit and over current protection. Under-Voltage lockout prevents erratic operation when the input voltage is slowly decaying. Thermal Protection shuts down the device when die temperature reaches 160°C. This is a useful protection when the device is under sustained short circuit conditions.

The device is available in a 8-pin TDFN 2x2 package.
2 Key Features
! Low Dropout Voltage 110mV 150mA load ! Operating Input Voltage Range 2.0V to 5.5V ! Output Voltage Range 1.2V to 5.0V 50mV steps ! Max. Output Current 150mA ! Low Shutdown Current 100nA ! High PSRR 60dB 10kHz ! Integrated Overtemperature/Overcurrent Protection ! Under-Voltage Lockout Feature ! Chip Enable Input ! Power-OK ! Low Quiescent Current 10µA ! Low Output Noise 15µV 100kHz Bandwidth ! Operating Temperature Range -40°C to +85°C ! 8-pin TDFN 2x2 Package
3 Applications

The AS1367 is ideal for cellular phones, cordless phones, wireless communication equipment, portable games, cameras, video recorders, portable audio-video equipment and personal digital assistants.

Figure AS1367 - Typical Application Diagram

Input 2V to 5.5V CIN
1µF

ON / OFF

AS1367

RPU 100kΩ

Output 1.2V to 5.0V

COUT 3.3µF

CBYP 10nF
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AS1367

Datasheet - Pin Assignments
4 Pin Assignments

Figure Pin Assignments Top View

OUT 1 BYP 2 SET 3

AS1367

Exposed Pad
7 IN 6 POK 5 GND

Pin Descriptions

Table Pin Descriptions

Pin Name OUT BYP SET EN GND POK IN GND

Pin Number

Regulated Output Voltage. The current flowing out of this pin is equivalent
to a DC load current. Fixed and 4.5V output, as well as
versions from 1.2V up to 5.0V can be ordered.

Bypass this pin with 3.3µF to GND.

Bypass. This pin should be connected via a 10nF capacitor to pin OUT.

Set Input. Connect to GND for preset output. Connect to a resistive voltage-
The AS1367 is low-dropout, low-quiescent-current linear regulator intended for LDO regulator applications where output current load requirements range from no load to 150mA. All devices come standard with adjustable output voltages of 1.2V to 5.0V and fixed output voltages see Ordering Information on page

The AS1367 also features a Power-OK output to indicate when the output is within 6% of final value, and also an Enable pin. Shutdown current for the whole regulator is typically 10nA. The device features integrated short-circuit and over current protection. Under-Voltage lockout prevents erratic operation when the input voltage is slowly decaying e.g. in a battery powered application . Thermal Protection shuts down the device when die temperature reaches 160°C. This is a useful protection when the device is under sustained short circuit conditions.

The bandgap reference is connected to the inverting input of the error amplifier. The error amplifier compares this reference with the feedback voltage and amplifies the difference. If the feedback voltage is lower than the reference voltage, the P-channel MOSFET gate is pulled lower, allowing more current to pass to the output, and increases the output voltage. If the feedback voltage is too high, the pass-transistor gate is pulled up, allowing less current to pass to the output. The output voltage feeds back through an internal resistor voltage divider connected to pin OUT.

Figure AS1367 - Block Diagram

Battery Protection

Thermal Overload Protection

Shutdown/ Power-On Control Logic

Bandgap Voltage &

Current Reference

Trimmable Reference

Voltage

Error

Amplifier

AS1367

Power-OK Compare

Logic

NMOS

Output Voltages
Standard products are factory-set with output voltages from 1.2V to 5.0V. A two-digit suffix of the part number identifies the nominal output see Ordering Information on page Non-standard devices are available. For more information contact:
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AS1367

Datasheet - Detailed Description

Power-OK

The AS1367’s power-ok is built around an N-channel MOSFET. The circuitry monitors the voltage on pin SET and if the voltage goes out of regulation e.g. during dropout, current limit, or thermal shutdown the pin POK goes low. If the pin SET is connected to GND an internal resistive-divider is activated and connected to the output. Therefore, the PowerOK functionality can be realised with no additional external components.

The Power-OK feature is not active during shutdown and provides a power-on-reset function that can operate down to VIN = 2.0V. A capacitor to GND may be added to generate a power-on-reset delay. To obtain a logic-level output, connect a pull-up resistor from pin POK to pin OUT. Larger values for this resistor will help to minimize current consumption a 100kΩ resistor is perfect for most applications see Figure 1 on page

Current Limiting

The AS1367 include current limiting circuitry to protect against short-circuit conditions. The circuitry monitors and controls the gate voltage of the P-channel MOSFET, typically limiting the output current to 180mA. The P-channel MOSFET output can be shorted to ground for an indefinite period of time without damaging the device.

Thermal-Overload Protection

The devices are protected against thermal runaway conditions by the integrated thermal sensor circuitry. Thermal shutdown is an effective tool to prevent die overheating since the power transistor is the principle heat source in the device.

If the junction temperature exceeds 160ºC with 20ºC hysteresis, the thermal sensor starts the shutdown logic, at which point the P-channel MOSFET is switched off. After the device temperature has dropped by approximately 20ºC, the thermal sensor will turn the P-channel MOSFET on again. Note that this will be exhibited as a pulsed output under continuous thermal-overload conditions.

Note The absolute maximum junction-temperature of +150ºC should not be exceeding during continual operation.

Operating Region and Power Dissipation

Maximum power dissipation is determined by the thermal resistance of the package and circuit board, the temperature difference between the die junction and the ambient air and the rate of the air flow. The power dissipation of the device is calculated by:

P = IOUT x VIN VOUT

Maximum power dissipation is calculated by:

PMAX

Where TJ - TAMB is the temperature difference between the device die junction and the surrounding air. is the thermal resistance through the circuit board, copper traces, and other materials to the surrounding.

Note Pin GND is a multi-function pin providing a connection to the system ground and acting as a heat sink. This pin should be connected to the system ground using a large pad or a ground plane.
10 - 14

AS1367

Datasheet - Application Information
9 Application Information

Capacitor Selection and Regulator Stability

Ceramic capacitors are highly recommended as they offer distinct advantages over their tantalum and aluminum electrolytic components. For stable operation with load currents up to the maximum over the entire device temperature range, use a 3.3µF min ceramic output capacitor with an ESR Use large output capacitor values 10µF max to reduce noise and improve load transient-response, stability and power-supply rejection.

Note Some ceramic capacitors exhibit large capacitance and ESR variations with variations in temperature. Z5U and Y5V capacitors may be required to ensure stability at temperatures below TAMB = -10ºC. With X7R or X5R capacitors, a 3.3µF capacitor should be sufficient at all operating temperatures.

Power Supply Rejection Ratio

The AS1367 are designed to deliver low dropout voltages and low quiescent currents. Power-supply rejection is typically 60dB at 10kHz. To improve power supply-noise rejection and transient response, increase the values of the input and output bypass capacitors.

The Electrical Characteristics on page 4 show also the device line- and load-transient responses. For further details see the Power-Supply Rejection Ratio vs. Frequency graph in the Figure 9 on page

Dropout Voltage

For standard products with output voltage greater than the minimum VIN 1.2V , the minimum input-output voltage differential dropout voltage determines the lowest usable supply voltage. This determines the useful end-of-life battery voltage in battery-powered systems. The dropout voltage is a function of the P-MOSFET drain-to-source onresistance multiplied by the load current, and it is calculated by:

VDROPOUT = VIN VOUT = RDS ON x IOUT

Where RDS ON is the drain-to-source on-resistance. IOUT is the output current.

Figure Application Diagrams

Input 2V to 5.5V
1µF

External Voltage Level Detection Input Monitoring

AS1367

Output 1.2V to 5.0V

RPU 100kΩ
Datasheet - Ordering Information
11 Ordering Information
The device is available as the standard products listed in Table Ordering Information
Ordering Code AS1367-BTDT-12 AS1367-BTDT-18 AS1367-BTDT-30 AS1367-BTDT-33 AS1367-BTDT-45

Marking AB AC AD AE AF

Output 1.2V 1.8V 3.0V 3.3V 4.5V

Description 150mA, Adaptive LDO 150mA, Adaptive LDO 150mA, Adaptive LDO 150mA, Adaptive LDO 150mA, Adaptive LDO

Delivery Form Tape and Reel Tape and Reel Tape and Reel Tape and Reel Tape and Reel

Package 8-pin TDFN 2x2 8-pin TDFN 2x2 8-pin TDFN 2x2 8-pin TDFN 2x2 8-pin TDFN 2x2

Non-standard devices from 1.2V to 5.0V 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
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AS1367

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: AS1367-BTDT-33 519623