Datasheet AS1367 150mA, Adaptive Low Drop-Out Linear Regulator 1 General Description 2 Key Features Low Dropout Voltage: 110mV 150mA load The AS1367 is a precise, low noise, high speed, low dropout regulator with adaptive operation. Features Operating Input Voltage Range: 2.0V to 5.5V included are high ripple rejection and low dropout volt- Output Voltage Range: 1.2V to 5.0V (50mV steps) age, a reference voltage source, an error amplifier and a Max. Output Current: 150mA current limiter. Low Shutdown Current: 100nA The AS1367 provides high speed operation, low power consumption and high efficiency by automatically High PSRR: 60dB 10kHz switching between a light load and a heavy load mode Integrated Overtemperature/Overcurrent Protection depending upon the output current level. Under-Voltage Lockout Feature The EN function enables the output to be turned off, Chip Enable Input while the electric charge at the output capacitor is discharged via the internal auto-discharge resistance, Power-OK and as a result the VOUT pin quickly returns to the GND Low Quiescent Current: 10A level. Low Output Noise: 15V 100kHz Bandwidth Furthermore a Bypass Pin is included to reduce noise. Operating Temperature Range: -40C to +85C The device features integrate short-circuit and over current protection. Under-Voltage lockout prevents 8-pin TDFN 2x2 Package erratic operation when the input voltage is slowly decaying. Thermal Protection shuts down the device 3 Applications when die temperature reaches 160C. This is a useful protection when the device is under sustained short The AS1367 is ideal for cellular phones, cordless circuit conditions. phones, wireless communication equipment, portable The device is available in a 8-pin TDFN 2x2 package. games, cameras, video recorders, portable audio-video equipment and personal digital assistants. Figure 1. AS1367 - Typical Application Diagram Input Output 2V to 5.5V 1.2V to 5.0V IN OUT C IN C OUT AS1367 1F R 3.3F PU 100k IN POK C BYP 10nF ON / EN BYP OFF GND SET www.austriamicrosystems.com Revision 1.02 1 - 14AS1367 Datasheet - Pin Assignments 4 Pin Assignments Figure 2. Pin Assignments (Top View) OUT 1 8 IN BYP 2 7 IN AS1367 SET 3 6 POK Exposed Pad EN 4 5 GND Pin Descriptions Table 1. Pin Descriptions Pin Name Pin Number Description Regulated Output Voltage. The current flowing out of this pin is equivalent to a DC load current. Fixed 1.2, 1.5, 1.8, 3.0, 3.3 and 4.5V output, as well as OUT 1 versions from 1.2V up to 5.0V can be ordered. Bypass this pin with 3.3F to GND. 2 Bypass. This pin should be connected via a 10nF capacitor to pin OUT. BYP Set Input. Connect to GND for preset output. Connect to a resistive voltage- SET 3 divider between OUT and GND to set the output voltage between 1.2V and 5.0V. Active-High Enable Input. A logic low reduces the supply current to < 1A. EN 4 Connect this pin to pin IN for normal operation. Ground. This pin also functions as a heat sink. Solder it to a large pad or to 5 GND the circuit-board ground plane to maximize power dissipation. Power-OK Output. Active-low, open-drain output indicates an out-of- POK 6 regulation condition. Connect a 100k pull-up resistor to pin OUT for logic levels. Leave this pin unconnected if the Power-OK feature is not used. Input Voltage. These pins should be connected to the positive terminal of IN 7, 8 the input capacitor. Bypass this pin with 1F to GND. Input voltage can range from 2.0V to 5.5V. Exposed Pad. This pin also functions as a heat sink. Solder it to a large pad GND Exposed Pad or to the circuit-board ground plane to maximize power dissipation. Internally it is connected GND. www.austriamicrosystems.com Revision 1.02 2 - 14