AS1363 1 A L o w D r o p o u t L i n e a r Vo l t a g e R e g u l a t o r 1 General Description 2 Key Features The AS1363 is a low-dropout linear regulator that operates from a +2.0V to +5.5V supply and delivers a guaranteed 500mA load current with low 150mV dropout. Guaranteed Output Current: 500mA The device is available in two versions (see Table 1). One version has a high-accuracy output with a preset voltage (1.2V, 1.5V, 1.8V, 3.0V, 3.3V, or 4.5V). This voltage is internally trimmed and also offers a Bypass pin. With a capacitor connected to this Bypass pin, the PSRR and the Noise performance is improved. 2.0V to 5.5V Input Voltage At the other version the output voltage is user-adjustable (1.2V to 5.3V) and offers an SET pin for setting the output voltage. Table 1. Standard Products Low Dropout: 150mV @ 500mA Fixed Output Voltage: 1.2V to 5.0V User-Adjustable Output Voltage: 1.2V to 5.3V Power OK Output Low Quiescent Current: 40µA Low Shutdown Current: 30nA Model Output Type BYP SET AS1363-AD Adjustable No Yes AS1363-_ _ Fixed Yes No Thermal Overload Protection Output Current Limit A low supply current (65µA typ.) at maximum load is making the device ideal for portable battery-operated equipment. Other features are included such as an active-low open-drain reset output that indicates when the output is out of regulation, a lowcurrent (30nA typ.) shutdown mode, an integrated short-circuit and a thermal shutdown protection. When in shutdown, a 5k (typ) discharge path is connected between the output pin and ground. The AS1363 is available in a 6pin SOT23 package. Output discharge path during shutdown 6-pin SOT23 Package 3 Applications The device is ideal for laptops, PDAs, portable audio devices, mobile phones, cordless phones, and any other battery-operated portable device. Figure 1. AS1363 - Typical Application Circuit 6 1 VIN 2.0V to 5.5V CIN 1µF OUT IN VOUT 1.2V to 5.3V COUT2 .2µF R1 On Off 3 AS1363-AD 5 SET EN R2 2 To Controller 4 GND POK VOUT Logic Supply Voltage www.ams.com/LDO RPOK 100k Revision 1.9 1 - 19 AS1363 Datasheet - P i n A s s i g n m e n t s 4 Pin Assignments Figure 2. Pin Assignments (Top View) IN 1 POK 2 EN 3 6 OUT AS1363 5 SET/BYP 4 GND 4.1 Pin Descriptions Table 2. Pin Descriptions Pin Number Pin Name 1 IN 2 POK Open-Drain POK Output. POK remains low while VOUT is below the POK threshold. Connect a 100k pull-up resistor from this pin to OUT to obtain an output voltage (see Figure on page 1). 3 EN Active-High Enable Input. A logic low reduces supply current below 30nA. In shutdown mode, the POK output is low, and OUT is high impedance. Connect this pin to IN for normal operation. 4 GND Ground SET Voltage-Setting Input. Connect to GND for preset output or Connect to a resistive voltagedivider between OUT and GND to set the output voltage between 1.2V and 5.3V (see Figure on page 1). BYP Bypass Pin. Connect a 10nF capacitor from this pin to VOUT to improve PSRR and noise performance (see Figure 16 on page 9). OUT Output. Sources up to 500mA. Bypass this pin with a 2.2µF low-ESR capacitor to GND (see Figure on page 1). Note: For output voltages below 2V a 4.7µF capacitor should be used. 5 6 www.ams.com/LDO Description +2.0V to +5.5V Supply Voltage. Bypass this pin with a 1µF capacitor to GND (see Package Drawings and Markings on page 16). Revision 1.9 2 - 19 AS1363 Datasheet - A b s o l u t e M a x i m u m R a t i n g s 5 Absolute Maximum Ratings Stresses beyond those listed in Table 3 may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in Electrical Characteristics on page 4 is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Table 3. Absolute Maximum Ratings Parameter Min Max Units IN, POK, EN, SET/BYP to GND -0.3 +6 V OUT to GND -0.3 VIN +0.3 V Output Short-Circuit Duration 1 min Continuous Power Dissipation 800 mW Operating Temperature Range -40 +85 ºC Storage Temperature Range -65 +150 ºC +125 ºC Junction Temperature Package Body Temperature Moisture Sensitive Level www.ams.com/LDO +260 ºC 1 Comments TAMB = +70ºC; derate 10mW/ºC above +70ºC The reflow peak soldering temperature (body temperature) specified is in accordance with IPC/JEDEC J-STD-020 “Moisture/Reflow Sensitivity Classification for NonHermetic Solid State Surface Mount Devices”. The lead finish for Pb-free leaded packages is matte tin (100% Sn). Represents an unlimited floor life time Revision 1.9 3 - 19 AS1363 Datasheet - E l e c t r i c a l C h a r a c t e r i s t i c s 6 Electrical Characteristics All limits are guaranteed. The parameters with min and max values are guaranteed with production tests or SQC (Statistical Quality Control) methods. VIN = VOUT(NOM) + 500mV or VIN = +2.0V (whichever is greater), CIN = 1µF, COUT = 2.2µF, EN = IN, TAMB = -40 to +85ºC (unless otherwise specified). Typical values are at TAMB = +25ºC. Table 4. Electrical Characteristics Symbol Parameter VIN Input Voltage VPOR Power On reset Condition Min 2.0 Output Voltage Accuracy (Preset Mode) 1.96 V +0.75 IOUT = 100mA -1.5 +1.5 -2 +2 1.2 5.3 V 1.23 V VSET/BYP SET/BYP Voltage Threshold (Adjustable Mode) IOUT Guaranteed Output Current (RMS) ILIMIT Short-Circuit Current Limit VOUT = 0V In-Regulation Current Limit VOUT > 96% of nominal value VIN = 2.5V, IOUT = 1mA, VOUT set to 2.0V 1.17 1.20 500 SET/BYP Threshold 0.55 SET/BYP Input Bias Current IQ Quiescent Current VIN - VOUT Dropout Voltage VLNR Line Regulation VIN from (VOUT + 100mV) to 5.5V, ILOAD = 5mA VLDR Load Regulation IOUT = 1 to 500mA VSET/BYP = 1.2V % mA 0.8 1.2 0.8 50 ISET Output Voltage Noise V -0.75 Adjustable Output Voltage Range Ripple Rejection 5.5 IOUT = 100µA, TAMB = +25ºC, VOUT 2 Unit 1.78 1 1.87 Max Falling, 100mV hysteresis IOUT = 1 to 500mA, VIN > (VOUT + 0.5V) PSRR Typ 100 -100 A A 150 mV +100 nA IOUT = 100µA 40 150 IOUT = 500mA 65 200 150 320 mV -0.125 +0.125 %/V -0.001 +0.001 %/mA IOUT = 500mA VOUT = 2.5V f = 1kHz, IOUT = 10mA, adjustable Output 65 f = 10kHz, IOUT = 10mA, adjustable Output 70 f = 100kHz, IOUT = 10mA, adjustable Output 60 10Hz to 100kHz, IOUT = 10mA, adjustable Output 80 100Hz to 100kHz, IOUT = 10mA, adjustable Output 65 EN = GND, VIN = 5.5V, TAMB = 25°C 0.03 µA dB µVRMS Shutdown IOFF VIH VIL IEN www.ams.com/LDO Shutdown Supply Current EN Input Threshold EN Input Bias Current EN = GND, VIN = 5.5V 2.0V < VIN < 5.5V 15 1.6 µA V 2.0V < VIN < 5.5V 0.6 EN = IN or GND, TAMB = +25ºC 1 TAMB = +85ºC 5 Revision 1.9 0.5 V nA 4 - 19 AS1363 Datasheet - E l e c t r i c a l C h a r a c t e r i s t i c s Table 4. Electrical Characteristics (Continued) Symbol Parameter Condition POK Output Low Voltage POK sinking 1mA Operating Voltage Range for Valid POK Signal POK sinking 100µA Min Typ Max Unit 0.05 0.25 V 5.5 V POK Output VOL POK Output High leakage Current POK Threshold 1.1 POK = 5.5V, TAMB = +25ºC 1 TAMB = +85ºC 5 Rising edge (referenced to VOUT(NOM)) 90 94 nA 98 % Thermal Protection TSHDNN Thermal Shutdown Temperature 170 ºC TSHDNN Thermal Shutdown Hysteresis 20 ºC COUT Output Capacitor 2.2 µF Load Capacitor Range Load Capacitor ESR 1 500 m 1. Guaranteed by production test of load regulation and line regulation. 2. Dropout voltage is defined as VIN - VOUT, when VOUT is 100mV below the value of VOUT measured for VIN = (VOUT(NOM) + 500mV). Since the minimum input voltage is 2.0V, this specification is only valid when VOUT(NOM) > 2.0V. www.ams.com/LDO Revision 1.9 5 - 19 AS1363 Datasheet - Ty p i c a l O p e r a t i n g C h a r a c t e r i s t i c s 7 Typical Operating Characteristics VIN = VOUT(NOM) + 0.5V, CIN = 1µF, COUT = 2.2µF, TAMB = 25°C (unless otherwise specified). Figure 3. VDROP vs. IOUT; Figure 4. VOUT vs. IOUT; VOUT(NOM) = 2.5V 160 2.503 120 Output Voltage (V) Dropout Voltage (mV) 140 100 80 60 40 2.502 2.501 2.5 20 0 2.499 0 100 200 300 400 500 0 100 Load Current (mA) Figure 5. VOUT vs. Temperature; VOUT(NOM) = 2.5V 300 400 500 Figure 6. VOUT vs. VIN; VOUT(NOM) = 2.5V 2.505 3 2.504 Iout = 0mA 2.5 2.503 Output Voltage (V) Output Voltage (V) 200 Output Current (mA) 2.502 2.501 2.5 2.499 Iout = 500mA 2 1.5 1 2.498 0.5 2.497 2.496 -45 -30 -15 0 0 15 30 45 60 75 90 0 0.5 Temperature (°C) Figure 7. Quiescent Current vs. VIN; no load 1.5 2 2.5 3 Figure 8. Quiescent Current vs. IOUT; VIN = 3.0V; 100 120 100 Quiescent Current (µA) Quiescent Current (µA) 1 Input Voltage (V) 80 60 40 20 0 80 60 40 20 0 0 1 2 3 4 5 0 6 Input Voltage (V) www.ams.com/LDO 100 200 300 400 500 Output Current (mA) Revision 1.9 6 - 19 AS1363 Datasheet - Ty p i c a l O p e r a t i n g C h a r a c t e r i s t i c s Figure 9. Quiescent Current vs. Temperature; VIN = 3.0V Figure 10. PSRR vs. Frequency; IOUT = 10mA, CIN = 68nF, -50 80 -60 PSRR (dB) Quiescent Current (µA) 100 60 40 -70 -80 20 no l oad Iout = 100mA -90 45 60 75 10 90 Temperature (°C) VOUT IOUT 200mV/Div 20mV/DIV VIN VOUT 100000 5µs/Div Figure 14. Startup; VIN = 3.0V, IOUT = 100mA 1V/DIV EN VOUT 1V/Div Figure 13. Startup; VIN = 3.0V, IOUT = 100mA EN 10000 Figure 12. Load Transient Response; VIN = 3.0V, IOUT = 50mA to 250mA 1ms/Div VOUT 1000 Frequency (Hz) Figure 11. Line Transient Response; VIN = 3.0V to 3.5V, IOUT = 100mA 1ms/Div www.ams.com/LDO 100 50mV/Div 30 100mA/DIV 15 1V/Div 0 1V/DIV 0 -45 -30 -15 20µs/Div Revision 1.9 7 - 19 AS1363 Datasheet - D e t a i l e d D e s c r i p t i o n 8 Detailed Description The AS1363 is a low-dropout, low-quiescent-current linear regulator specifically designed for battery-powered devices. The regulator supplies loads of up to 500mA and can deliver a factory-preset output voltage or user-adjustable output voltage. Figure 15. Block Diagram VIN 2.0V to 5.5V 1 IN CIN 1µF Thermal Sensor MOSFET Driver w/ILIM VOUT 1.2V to 5.3V 6 3 On Off EN Shutdown Logic OUT 1.2V Reference + Error Amplifier VOUT Logic Supply Voltage COUT 2.2µF 5k – R1 RPOK 100k To Controller 2 5 POK + – 93%VREF SET + – + – 100mV R2 + – 4 AS1363-AD GND Figure 15 shows the block diagram of the AS1363. It identifies the basics of a series linear regulator employing a P-Channel MOSFET as the control element. A stable voltage reference (1.2VREF in Figure 15) is compared with an attenuated sample of the output voltage. Any difference between the two voltages (reference and sample) creates an output from the error amplifier that drives the series control element to reduce the difference to a minimum. The error amplifier incorporates additional buffering to drive the relatively large gate capacitance of the series pass Pchannel MOSFET, when additional drive current is required under transient conditions.. Input supply variations are absorbed by the series element, and output voltage variations with loading are absorbed by the low output impedance of the regulator. The device features a 1.2V reference, error amplifier, P-channel pass transistor, and internal feedback voltage-divider (see Figure 15). Additional blocks include an output current limiter, thermal sensor, and shutdown logic. 8.1 Shutdown If pin EN is connected to GND the AS1363 is disabled. In shutdown mode all internal circuits are turned off, reducing supply current to 30nA typical. For normal operation pin EN must be connected to IN. During shutdown, POK is low. www.ams.com/LDO Revision 1.9 8 - 19 AS1363 Datasheet - D e t a i l e d D e s c r i p t i o n 8.2 Output Voltage Selection The AS1363 is available in two versions (see Ordering Information on page 18). One version can only operate at one fixed output voltage and the other version can operate with a preset output voltage or with user-adjustable output voltages (1.2V to 5.3V). For the fixed output voltage version connect a capacitor CBYP from pin BYP to VOUT to improve PSRR and Noise performance (see Figure 16). To use the factory preset output voltage of the user-adjustable output voltage version, connect pin SET to GND (see Figure 17). For configurations using an output voltage other than the factory preset, a voltage-divider from OUT to SET to GND is required, as shown in (see Figure on page 1). A value for R2 in the 25k to 100k range should be sufficient. Calculate the value for R1 as: V OUT R 1 = R 2 --------------------- – 1 V SETBYP (EQ 1) Where: VOUT is in a range from 1.2V to 5.3V. VSET/BYP = 1.2V. Figure 16. Fixed Output Voltage 1 VIN 2.0V to 5.5V 6 IN CIN 1µF VOUT 1.2V to 5.0V OUT COUT 2.2µF RPOK 100k AS1363 3 On Off 2 EN To Controller CBYP 10nF POK 5 4 GND BYP Figure 17. Adjustable Output using preset Output Voltage 1 VIN 2.5V to 5.5V CIN 1µF On Off VOUT 2.5V OUT COUT 2.2µF RPOK 100k 3 EN 4 GND www.ams.com/LDO 6 IN AS1363-AD 2 To Controller POK 5 SET Revision 1.9 9 - 19 AS1363 Datasheet - D e t a i l e d D e s c r i p t i o n 8.3 Power-OK The AS1363 features a power-ok indicator that asserts when the output voltage falls out of regulation. The open-drain POK output goes low when output voltage at OUT falls 6% below its nominal value. A 100k pull-up resistor from POK to a (typically OUT) provides a logic control signal. POK can be used as a power-on-reset (POR) signal to a microcontroller or can drive an external LED to indicate a power failure condition. Note: POK is low during shutdown. 8.4 Current Limit The AS1363 features current limiting circuitry that monitors the pass transistor, limiting short-circuit output current to 0.8A (typ). The circuitry of the AS1363 allows that the output can be shorted to ground for an indefinite period of time without damaging the device. 8.5 Thermal Overload Protection Integrated thermal overload protection limits the total power dissipation in the AS1363. When the junction temperature (TJ) exceeds +170ºC typically, the pass transistor is turned off. Normal operation is continued when TJ drops approximately 20ºC. Note: Regardless of the hysteresis, continuous short-circuit condition will result in a pulsed output. www.ams.com/LDO Revision 1.9 10 - 19 AS1363 Datasheet - A p p l i c a t i o n I n f o r m a t i o n 9 Application Information 9.1 Dropout Voltage Dropout is the input to output voltage difference, below which the linear regulator ceases to regulate. At this point, the output voltage change follows the input voltage change. Dropout voltage may be measured at different currents and, in particular at the regulator maximum one. From this is obtained the MOSFET maximum series resistance over temperature etc. More generally: V DROPOUT = I LOAD R SERIES (EQ 2) Dropout is probably the most important specification when the regulator is used in a battery application. The dropout performance of the regulator defines the useful “end of life” of the battery before replacement or re-charge is required. Figure 18. Graphical Representation of Dropout Voltage VIN VOUT VIN = VOUT(TYP) + 0.5V Dropout Voltage VOUT 100mV VIN VOUT VIN Figure 18 shows the variation of VOUT as VIN is varied for a certain load current. The practical value of dropout is the differential voltage (VOUTVIN) measured at the point where the LDO output voltage has fallen by 100mV below the nominal, fully regulated output value. The nominal regulated output voltage of the LDO is that obtained when there is 500mV (or greater) input-output voltage differential. 9.2 Efficiency Low quiescent current and low input-output voltage differential are important in battery applications amongst others, as the regulator efficiency is directly related to quiescent current and dropout voltage. Efficiency is given by: V I V IN I Q + I LOAD LOAD LOAD Efficiency = --------------------------------------- 100 % (EQ 3) Where: IQ = Quiescent current of LDO measured at VBIAS. www.ams.com/LDO Revision 1.9 11 - 19 AS1363 Datasheet - A p p l i c a t i o n I n f o r m a t i o n 9.3 Power Dissipation Maximum power dissipation (PD) of the LDO is the sum of the power dissipated by the internal series MOSFET and the quiescent current required to bias the internal voltage reference and the internal error amplifier, and is calculated as: PD MAX Seriespass = I LOAD MAX V IN MAX – V OUT MIN Watts (EQ 4) Internal power dissipation as a result of the bias current for the internal voltage reference and the error amplifier is calculated as: PD MAX Bias = V IN MAX I Q Watts (EQ 5) PD MAX Total = PD MAX Seriespass + PD MAX Bias Watts (EQ 6) Total LDO power dissipation is calculated as: 9.4 Junction Temperature Under all operating conditions, the maximum junction temperature should not be allowed to exceed 125ºC (unless the data sheet specifically allows). Limiting the maximum junction temperature requires knowledge of the heat path from junction to case (JCºC/W fixed by the IC manufacturer), and adjustment of the case to ambient heat path (CAºC/W) by manipulation of the PCB copper area adjacent to the IC position. Figure 19. Package Physical Arrangements SOTxx Package Chip Package Bond Wire Lead Frame PCB Figure 20. Steady State Heat Flow Equivalent Circuit Package TC°C Junction TJ°C RJC PCB/Heatsink TS°C RCS Ambient TA°C RSA Chip Power www.ams.com/LDO Revision 1.9 12 - 19 AS1363 Datasheet - A p p l i c a t i o n I n f o r m a t i o n Total Thermal Path Resistance: R JA = R JC + R CS + R SA (EQ 7) T J = PD MAX R JA + T AMB ºC (EQ 8) Junction Temperature (TJºC) is determined by: 9.5 Explanation of Steady State Specifications 9.5.1 Line Regulation Line regulation is defined as the change in output voltage when the input (or line) voltage is changed by a known quantity. It is a measure of the regulator’s ability to maintain a constant output voltage when the input voltage changes. Line regulation is a measure of the DC open loop gain of the error amplifier. More generally: V V IN OUT Line Regulation = ---------------- and is a pure number In practise, line regulation is referred to the regulator output voltage in terms of % / VOUT. This is particularly useful when the same regulator is available with numerous output voltage trim options. V V IN 100 V OUT OUT Line Regulation = ---------------- ------------ % / V 9.5.2 (EQ 9) Load Regulation Load regulation is defined as the change of the output voltage when the load current is changed by a known quantity. It is a measure of the regulator’s ability to maintain a constant output voltage when the load changes. Load regulation is a measure of the DC closed loop output resistance of the regulator. More generally: V I OUT OUT Load Regulation = ---------------- and is units of ohms () (EQ 10) In practise, load regulation is referred to the regulator output voltage in terms of % / mA. This is particularly useful when the same regulator is available with numerous output voltage trim options. V I OUT 100 V OUT OUT Load Regulation = ---------------- ---------------- % / mA 9.5.3 (EQ 11) Setting Accuracy Accuracy of the final output voltage is determined by the accuracy of the ratio of R1 and R2, the reference accuracy and the input offset voltage of the error amplifier. When the regulator is supplied pre-trimmed, the output voltage accuracy is fully defined in the output voltage specification. When the regulator has a SET terminal, the output voltage may be adjusted externally. In this case, the tolerance of the external resistor network must be incorporated into the final accuracy calculation. Generally: R1 R1 V OUT = V SET V SET 1 + --------------------- R2 R2 (EQ 12) The reference tolerance is given both at 25ºC and over the full operating temperature range. 9.5.4 Total Accuracy Away from dropout, total steady state accuracy is the sum of setting accuracy, load regulation and line regulation. Generally: Total % Accuracy = Setting % Accuracy + Load Regulation % + Line Regulation % www.ams.com/LDO Revision 1.9 (EQ 13) 13 - 19 AS1363 Datasheet - A p p l i c a t i o n I n f o r m a t i o n 9.6 Explanation of Dynamic Specifications 9.6.1 Power Supply Rejection Ratio (PSRR) Known also as Ripple Rejection, this specification measures the ability of the regulator to reject noise and ripple beyond DC. PSRR is a summation of the individual rejections of the error amplifier, reference and AC leakage through the series pass transistor. The specification, in the form of a typical attenuation plot with respect to frequency, shows up the gain bandwidth compromises forced upon the designer in low quiescent current conditions. Generally: V OUT V IN PSSR = 20Log ---------------- dB using lower case to indicate AC values (EQ 14) Power supply rejection ratio is fixed by the internal design of the regulator. Additional rejection must be provided externally. 9.6.2 Output Capacitor ESR The series regulator is a negative feedback amplifier, and as such is conditionally stable. The ESR of the output capacitor is usually used to cancel one of the open loop poles of the error amplifier in order to produce a single pole response. Excessive ESR values may actually cause instability by excessive changes to the closed loop unity gain frequency crossover point. The range of ESR values for stability is usually shown either by a plot of stable ESR versus load current, or a limit statement in the datasheet. Some ceramic capacitors exhibit large capacitance and ESR variations with temperature. Z5U and Y5V capacitors may be required to ensure stability at temperatures below TAMB = -10ºC. With X7R or X5R capacitors, a 2.2µF capacitor should be sufficient at all operating temperatures. Larger output capacitor values (10µF max) help to reduce noise and improve load transient-response, stability and power-supply rejection. 9.6.3 Input Capacitor An input capacitor at VIN is required for stability. It is recommended that a 1.0µF capacitor be connected between the AS1363 power supply input pin VIN and ground (capacitance value may be increased without limit subject to ESR limits). This capacitor must be located at a distance of not more than 1cm from the VIN pin and returned to a clean analog ground. Any good quality ceramic, tantalum, or film capacitor may be used at the input. 9.6.4 Noise The regulator output is a DC voltage with noise superimposed on the output. The noise comes from three sources; the reference, the error amplifier input stage, and the output voltage setting resistors. Noise is a random fluctuation and if not minimized in some applications, will produce system problems. 9.6.5 Transient Response The series regulator is a negative feedback system, and therefore any change at the output will take a finite time to be corrected by the error loop. This “propagation time” is related to the bandwidth of the error loop. The initial response to an output transient comes from the output capacitance, and during this time, ESR is the dominant mechanism causing voltage transients at the output. More generally: V TRANSIENT = I OUTPUT R ESR Units are Volts, Amps, Ohms. (EQ 15) Thus an initial +50mA change of output current will produce a -12mV transient when the ESR=240m. Remember to keep the ESR within stability recommendations when reducing ESR by adding multiple parallel output capacitors. After the initial ESR transient, there follows a voltage droop during the time that the LDO feedback loop takes to respond to the output change. This drift is approx. linear in time and sums with the ESR contribution to make a total transient variation at the output of: T V TRANSIENT = I OUTPUT R ESR + ---------------- C LOAD Units are Volts, Seconds, Farads, Ohms. (EQ 16) Where: CLOAD is output capacitor T = Propagation delay of the LDO This shows why it is convenient to increase the output capacitor value for a better support for fast load changes. Of course the formula holds for t < “propagation time”, so that a faster LDO needs a smaller cap at the load to achieve a similar transient response. For instance 50mA load current step produces 50mV output drop if the LDO response is 1usec and the load cap is 1µF. There is also a steady state error caused by the finite output impedance of the regulator. This is derived from the load regulation specification discussed above. www.ams.com/LDO Revision 1.9 14 - 19 AS1363 Datasheet - A p p l i c a t i o n I n f o r m a t i o n 9.6.6 Turn On Time This specification defines the time taken for the LDO to awake from shutdown. The time is measured from the release of the enable pin to the time that the output voltage is within 5% of the final value. It assumes that the voltage at VIN is stable and within the regulator Min and Max limits. Shutdown reduces the quiescent current to very low, mostly leakage values (<1µA). 9.6.7 Thermal Protection To prevent operation under extreme fault conditions, such as a permanent short circuit at the output, thermal protection is built into the device. Die temperature is measured, and when a 170ºC (AS1363) threshold is reached, the device enters shutdown. When the die cools sufficiently, the device will restart (assuming input voltage exists and the device is enabled). Hysteresis of 20ºC prevents low frequency oscillation between startup and shutdown around the temperature threshold. www.ams.com/LDO Revision 1.9 15 - 19 AS1363 Datasheet - P a c k a g e D r a w i n g s a n d M a r k i n g s 10 Package Drawings and Markings The device is available in an 6-pin SOT23 package. Figure 21. 6-pin SOT23 Package www.ams.com/LDO Revision 1.9 16 - 19 AS1363 Datasheet - P a c k a g e D r a w i n g s a n d M a r k i n g s Figure 22. Package Markings Top Marking Pin1 ZZZZ Bottom Marking XXXX Pin1 Table 5. Package Code www.ams.com/LDO ZZZZ XXXX Marking Encoded Datecode Revision 1.9 17 - 19 AS1363 Datasheet - O r d e r i n g I n f o r m a t i o n 11 Ordering Information The device is available as the standard products shown in Table 6. Table 6. Ordering Information Ordering Code Marking Output SET/BYP Delivery Form Package AS1363-BSTT-AD ASQ9 adjustable (preset to 2.5V) SET Tape and Reel 6-pin SOT23 AS1363-BSTT-12* ASRY 1.2V BYP Tape and Reel 6-pin SOT23 AS1363-BSTT-15 ASRA 1.5V BYP Tape and Reel 6-pin SOT23 AS1363-BSTT-18 ASRB 1.8V BYP Tape and Reel 6-pin SOT23 AS1363-BSTT-30 ASRC 3.0V BYP Tape and Reel 6-pin SOT23 AS1363-BSTT-33 ASRD 3.3V BYP Tape and Reel 6-pin SOT23 AS1363-BSTT-45 ASRE 4.5V BYP Tape and Reel 6-pin SOT23 *Future product. Non-standard devices are available between 1.4V and 4.6V in 50mV steps and between 4.6V and 5.0V in 100mV steps. For more information and inquiries contact http://www.ams.com/contact Note: All products are RoHS compliant. Buy our products or get free samples online at ICdirect: http://www.ams.com/ICdirect Technical Support is available at http://www.ams.com/Technical-Support For further information and requests, please contact us mailto:[email protected] or find your local distributor at http://www.ams.com/distributor www.ams.com/LDO Revision 1.9 18 - 19 AS1363 Datasheet - O r d e r i n g I n f o r m a t i o n Copyrights Copyright © 1997-2012, ams 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 ams AG are covered by the warranty and patent indemnification provisions appearing in its Term of Sale. ams 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. ams 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 ams 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 ams AG for each application. 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