AS1374 Dual 200mA, Low-Noise, High-PSRR, Low Dropout Regulator General Description The AS1374 is a low-noise, low-dropout linear regulator with two separated outputs. Designed to deliver 200mA continuous output current at each output pin, the LDOs can achieve a low 120mV dropout for 200mA load current and are designed and optimized to work with low-cost, small-capacitance ceramic capacitors. An integrated P-channel MOSFET pass transistor allows the devices to maintain extremely low quiescent current (30A). The AS1374 uses an advanced architecture to achieve ultra-low output voltage noise of 20V RMS and a power-supply rejection-ratio of better than 85dB (@ 1kHz). Two active-High enable pins allows to switch on or off each output independently from each other. The AS1374 requires only 1F output capacitor for stability at any load. The device is available in a 6-bump WLCSP package. Ordering Information and Content Guide appear at end of datasheet. Key Benefits & Features The benefits and features of AS1374, Dual 200mA, Low-Noise, High-PSRR, Low Dropout Regulator are listed below: Figure 1: Added Value of Using AS1374 Benefits Features * Ideal for battery-powered applications * Input voltage from 2.0V to 5.5V * Low quiescent current of 30A * Low dropout of 120mV at 200mA load * Supports a variety of end applications * Output voltage from 1.2V to 3.6V * Guaranteed output current of 200mA * Pull-down option in shutdown (factory set) * Overtemperature and overcurrent protection and shutdown * Integrated temperature and output power monitoring * Cost-effective, small PCB area needed * Small external components needed * Small 6-balls WLCSP package ams Datasheet [v2-00] 2016-Jun-22 Page 1 Document Feedback AS1374 - General Description 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 2: A1374 Typical Application Circuit Input 2.0V to 5.5V VDD OUT1 CIN 1uF COUT1 1uF ON OFF EN1 ON OFF EN2 AS1374 OUT2 COUT2 1uF Output1 1.2V to 3.6V Output2 1.2V to 3.6V GND Page 2 Document Feedback ams Datasheet [v2-00] 2016-Jun-22 AS1374 - General Description Block Diagram The functional blocks of this device are shown below: Figure 3: A1374 Block Diagram AS1374 EN1 VDD EN2 ams Datasheet [v2-00] 2016-Jun-22 OUT1 Enable Logic CH1 Thermal Protection Common Logic Enable Logic CH2 Bandgap Trimmable Reference Overcurrent Protection CH1 GND Overcurrent Protection CH2 OUT2 Page 3 Document Feedback AS1374 - Pin Assignment Pin Assignment Figure 4: Pin Diagram Pin A1 indicator A1 OUT2 A2 VDD A3 OUT1 B1 EN2 B2 GND B3 EN1 Figure 5: Pin Descriptions Pin Number Pin Name A1 OUT 2 A2 VDD A3 OUT 1 B1 EN 2 Enable 2. Pull this pin to logic low to disable Regulated Output 2 voltage. B2 GND Ground B3 EN 1 Enable 1. Pull this pin to logic low to disable Regulated Output 1 voltage. Page 4 Document Feedback Description Regulated Output Voltage 2. Bypass this pin with a capacitor to GND. See Application Information for capacitor selection. Input Supply Regulated Output Voltage 1. Bypass this pin with a capacitor to GND. See Application Information for capacitor selection. ams Datasheet [v2-00] 2016-Jun-22 AS1374 - Absolute Maximum Ratings Absolute Maximum Ratings Stresses beyond those listed in Absolute Maximum Ratings 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 is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Figure 6: Absolute Maximum Ratings Parameter Min Max Units Comments Electrical Parameters VDD to GND -0.3 7 V All other pins to GND -0.3 VDD + 0.3 V Output short-circuit duration Input current (latch-up immunity) Infinite -100 100 mA JEDEC 78 Electrostatic Discharge Electrostatic discharge HBM 2 kV MIL 883 E method 3015 Temperature Ranges and Storage Conditions Thermal resistance JA 201.7 C/W Junction temperature 125 C 150 C Storage temperature range -55 Package body temperature Relative humidity non-condensing Moisture sensitivity level ams Datasheet [v2-00] 2016-Jun-22 5 1 260 C 85 % Junction-to-ambient thermal resistance is very dependent on application and board-layout. In situations where high maximum power dissipation exists, special attention must be paid to thermal dissipation during board design. The reflow peak soldering temperature (body temperature) specified is in accordance with IPC/JEDEC J-STD-020"Moisture/Reflow Sensitivity Classification for Non-Hermetic Solid State Surface Mount Devices". Maximum floor life time of Unlimited Page 5 Document Feedback AS1374 - Electrical Characteristics Electrical Characteristics V IN = V OUT + 0.5V, V OUT = 2.85V, CIN = COUT = 1F, Typical values are at TAMB = 25C (unless otherwise specified). All limits are guaranteed. The parameters with min and max values are guaranteed with production tests or SQC (Statistical Quality Control) methods. Figure 7: Electrical Characteristics Symbol TAMB VIN VOUT IOUT IGND ILIMIT IQ Parameter Condition Max Unit -40 85 C 2 5.5 V IOUT = 1mA, TAMB = 25C -1 +1 IOUT = 100A to 200mA, TAMB = 25C -1.5 +1.5 IOUT = 100A to 200mA -2.5 +2.5 Each channel 200 Operating Temperature Range Input Range Output Voltage Accuracy Maximum Output Current Min Typ % mA One channel on, IOUT = 50A 25 50 A One channel on, IOUT = 200mA 30 55 A 300 400 mA mV Ground Current Current Limit OUT = short Dropout Voltage(1) 2V VOUT < 2.5V, IOUT = 100mA 80 150 Both channels on, IOUT = 0.05mA 30 90 Quiescent Current Both channels ON, VIN = VOUTNOM - 0.1V, IOUT = 0mA 210 A 50 VLNR Line Regulation VIN = (VOUT +0.5V) to 5.5V, IOUT = 1mA 0.02 %/V VLDR Load Regulation IOUT = 1 to 200mA 0.00 05 %/mA ISHDN Shutdown Current OUT 1 and OUT 2 disable 0.01 PSRR Ripple Rejection Page 6 Document Feedback f = 1kHz, IOUT = 10mA 85 f = 10kHz, IOUT = 10mA 65 f = 100kHz, IOUT = 10mA 50 2 A dB ams Datasheet [v2-00] 2016-Jun-22 AS1374 - Electrical Characteristics Symbol Parameter Output Noise Voltage (RMS) Condition Min f = 100Hz to 100kHz, ILOAD = 20mA Typ Max Unit 20 V 0.01 A Enable Enable Input Bias Current Both channels initially OFF 150 One channel initially OFF 200 Enable Exit Delay (2) s Enable Logic Low Level 0.4 Enable Logic High Level 1.4 V V Thermal Protection TSHDN Thermal Shutdown Temperature 160 C TSHDN Thermal Shutdown Hysteresis 15 C Load Capacitor Range COUT 0.47 10 F 500 m Output Capacitor Maximum ESR Load Note(s): 1. Dropout is defined as VIN - VOUT when VOUT is 100mV below the value of VOUT for VIN = VOUT + 0.5V. 2. Time needed for VOUT to reach 90% of final value. ams Datasheet [v2-00] 2016-Jun-22 Page 7 Document Feedback AS1374 - Typical Operating Characteristics Typical Operating Characteristics V IN = V OUT + 0.5V, V OUT = 2.85V, C IN = COUT = 1F, TAMB = 25C (unless otherwise specified). Figure 8: Output Voltage vs. Temperature 2.88 Output Voltage (V) 2.87 2.86 2.85 2.84 CH1 2.83 CH2 2.82 -45 -30 -15 0 15 30 45 60 75 90 Temperature (C) Figure 9: Output Voltage vs. Input Voltage 2.88 Output Voltage (V) 2.87 2.86 2.85 2.84 Iload = 1mA Iload = 10mA 2.83 Iload = 100mA Iload = 200mA 2.82 3.35 3.85 4.35 4.85 5.35 Input Voltage (V) Page 8 Document Feedback ams Datasheet [v2-00] 2016-Jun-22 AS1374 - Typical Operating Characteristics Figure 10: Output Voltage vs. Load Current 2.88 -40C 2.87 +25C Output voltage (V) +85C 2.86 2.85 2.84 2.83 2.82 2.81 2.8 0 25 50 75 100 125 150 175 200 Load Current (mA) Figure 11: Output Voltage vs. Input Voltage - Dropout 2.86 Output Voltage (V) 2.84 2.82 2.8 2.78 2.76 Iload = 100mA 2.74 2.72 2.75 Iload = 200mA 2.8 2.85 2.9 2.95 3 3.05 Input Voltage (V) ams Datasheet [v2-00] 2016-Jun-22 Page 9 Document Feedback AS1374 - Typical Operating Characteristics Figure 12: Dropout Voltage vs. Load Current 150 Dropout Voltage (V) 125 100 75 50 -40C 25 +25C +85C 0 25 50 75 100 125 150 175 200 Load Current (mA) Figure 13: PSRR vs. Frequency 100 90 PSRR (dB) 80 70 60 50 40 30 20 100 1000 10000 100000 Frequency (Hz) Page 10 Document Feedback ams Datasheet [v2-00] 2016-Jun-22 AS1374 - Typical Operating Characteristics Figure 14: Ground Pin Current vs. Load Current 33 Ground Pin Current (A) 32 31 30 29 28 27 26 25 -40C +25C 24 +85C 23 0 25 50 75 100 125 150 175 200 75 90 Load Current (mA) Figure 15: Ground Pin Current vs. Temperature Ground Pin Current (A) 30 29 28 27 26 25 -45 -30 -15 0 15 30 45 60 Temperature (C) ams Datasheet [v2-00] 2016-Jun-22 Page 11 Document Feedback AS1374 - Typical Operating Characteristics Figure 16: Ground Pin Current vs. Input Voltage; One Channel On, No Load Ground Pin Current (A) 60 50 40 30 20 -40C 10 +25C +85C 0 0 1 2 3 4 5 Input Voltage (V) Figure 17: Ground Pin Current vs. Input Voltage; One Channel On, ILOAD = 200mA Ground Pin Current (A) 60 50 40 30 20 -40C 10 +25C +85C 0 3.35 3.85 4.35 4.85 5.35 Input Voltage (V) Page 12 Document Feedback ams Datasheet [v2-00] 2016-Jun-22 AS1374 - Typical Operating Characteristics Figure 18: Ground Pin Current vs. Input Voltage; Both Channels on, No Load 100 Ground Pin Current (A) 90 80 70 60 50 40 30 20 -40C +25C 10 +85C 0 0 1 2 3 4 5 Input Voltage (V) Figure 19: Ground Pin Current vs. Input Voltage; Both Channels On, ILOAD = 200mA 100 Ground Pin Current (A) 90 80 70 60 50 40 30 20 -40C +25C 10 0 3.35 +85C 3.85 4.35 4.85 5.35 Input Voltage (V) ams Datasheet [v2-00] 2016-Jun-22 Page 13 Document Feedback AS1374 - Typical Operating Characteristics Figure 20: Shutdown Current vs. Input Voltage 60 Shutdown Current (nA) -40C +25C 50 +85C 40 30 20 10 0 0.5 1.5 2.5 3.5 4.5 5.5 Input Voltage (V) Figure 21: Load Regulation vs. Temperature Load Regulation (% / mA) 0 -0.0002 -0.0004 -0.0006 -0.0008 CH1 -0.001 CH2 -0.0012 -45 -30 -15 0 15 30 45 60 75 90 Temperature (C) Page 14 Document Feedback ams Datasheet [v2-00] 2016-Jun-22 AS1374 - Typical Operating Characteristics Figure 22: Line Regulation vs. Load Current 0.2 Line Regulation (% / V) 0.15 0.1 0.05 0 -0.05 -0.1 -40C +25C -0.15 +85C -0.2 0 25 50 75 100 125 150 175 200 Load Current (mA) Figure 23: Line Regulation vs. Temperature 0.2 Line Regulation (% / V) 0.15 0.1 0.05 0 -0.05 Iload = 1mA -0.1 Iload = 10mA Iload = 100mA -0.15 Iload = 200mA -0.2 -45 -30 -15 0 15 30 45 60 75 90 Temperature (C) ams Datasheet [v2-00] 2016-Jun-22 Page 15 Document Feedback AS1374 - Typical Operating Characteristics Figure 24: Load Transient Response, Crosstalk, Between CH1 and CH2, IOUT = 200mA 10mV/div Vout1 Vout2 10mV/div Iout1 100mA/div 20us/div Figure 25: Load Transient Response Near Dropout, IOUT = 200mA Vout1 20mV/div Iout1 100mA/div 20us/div Page 16 Document Feedback ams Datasheet [v2-00] 2016-Jun-22 AS1374 - Typical Operating Characteristics Figure 26: Line Transient Response Vout1 10mV/div Vin 500mV/div 100us/div Figure 27: Shutdown EN1 2V/div Vout1 1V/div Iout1 50mA/div 100us/div ams Datasheet [v2-00] 2016-Jun-22 Page 17 Document Feedback AS1374 - Typical Operating Characteristics Figure 28: Startup of CH1 When CH2 is Off 2V/div EN1 1V/div Vout1 100mA/div Iin 20us/div Figure 29: Startup of CH1 When CH2 is On 2V/div EN1 1V/div Vout1 100mA/div Iin 20us/div Page 18 Document Feedback ams Datasheet [v2-00] 2016-Jun-22 AS1374 - Detailed Description Detailed Description Figure 3 shows the block diagram of the AS1374. It identifies the basics of a series linear regulator employing a P-Channel MOSFET as the control element. A stable voltage reference (REF in Figure 3) 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 P-Channel 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. Output Voltage The AS1374 deliver preset output voltages from 1.2V to 3.6V, in 50mV increments (see Ordering Information). Enable The AS1374 feature an active high enable mode to shutdown each output independently. Driving EN 1 low disables Output 1, driving EN 2 low disables Output 2. The disabled Output enters a high-impedance state. Current Limit The AS1374 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 300mA. Note(s): See Figure 7 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 AS1374. When the junction temperature (TJ ) exceeds 160C, 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 15C, resulting in a pulsed output during continuous thermal-overload conditions. Note(s): 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 150C. ams Datasheet [v2-00] 2016-Jun-22 Page 19 Document Feedback AS1374 - Application Information Application Information 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 load currents, but is usually specified at maximum output. As a result, the MOSFET maximum series resistance over temperature is obtained. More generally: (EQ1) V DROPOUT = I LOAD x RSERIES 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 30: Graphical Representation of Dropout Voltage VOUT VIN VIN VOUT + 0.5V Dropout Voltage VOUT 100mV VIN VOUT VIN Figure 30 shows the variation of VOUT as V IN is varied for a certain load current. The practical value of dropout is the differential voltage (VOUT - VIN ) 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. Page 20 Document Feedback ams Datasheet [v2-00] 2016-Jun-22 AS1374 - Application Information 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: (EQ2) V xI V IN ( I Q + I LOAD ) LOAD LOAD - x 100 % Efficiency = ------------------------------------------ Where: IQ = Quiescent current of LDO 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: (EQ3) PD ( MAX ) ( Seriespass ) = I LOAD ( MAX ) (V IN ( MAX ) -V OUT ( MIN ) ) Watts Internal power dissipation as a result of the bias current for the internal voltage reference and the error amplifier is calculated as: (EQ4) PD ( MAX ) ( Bias ) = V I IN ( MAX ) Q Watts Total LDO power dissipation is calculated as: (EQ5) ams Datasheet [v2-00] 2016-Jun-22 PD ( MAX ) ( Total ) = PD ( MAX ) ( Seriespass ) + PD ( MAX ) ( Bias ) Watts Page 21 Document Feedback AS1374 - Application Information Junction Temperature Under all operating conditions, the maximum junction temperature should not be allowed to exceed 125C (unless otherwise specified in the datasheet). Limiting the maximum junction temperature requires knowledge of the heat path from junction to case ( JCC/W fixed by the IC manufacturer), and adjustment of the case to ambient heat path ( CAC/W) by manipulation of the PCB copper area adjacent to the IC position. Figure 31: Steady State Heat Flow Equivalent Circuit Junction TJ Package TC RJC PCB TS RCS Ambient TA RS A RJA Total Thermal Path Resistance: (EQ6) R JA = R JC + R CS + R SA Junction Temperature (TJ C) is determined by: (EQ7) Page 22 Document Feedback TJ = (PD (MAX) x R JA) + TAMB C ams Datasheet [v2-00] 2016-Jun-22 AS1374 - Application Information Explanation of Steady State Specifications 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: (EQ8) 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 % / V OUT. This is particularly useful when the same regulator is available with numerous output voltage trim options. (EQ9) V V IN 100 OUT x -------------- % / V Line Regulation = -----------------V OUT 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: (EQ10) V I OUT OUT Load Regulation = -----------------and is units of Ohms () 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. (EQ11) V I OUT 100 OUT Load Regulation = -----------------x -------------- % / mA V OUT 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: (EQ12) R1 R1 V OUT = ( V SET V SET ) 1 + ---------------------- R2 R2 The reference tolerance is given both at 25C and over the full operating temperature range. ams Datasheet [v2-00] 2016-Jun-22 Page 23 Document Feedback AS1374 - Application Information Total Accuracy Away from dropout, total steady state accuracy is the sum of setting accuracy, load regulation and line regulation. Generally: (EQ13) Total % Accuracy = Setting % Accuracy + Load Regulation % + Line Regulation % Explanation of Dynamic Specifications 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: (EQ14) V V IN OUT - dB using lower case to indicate AC values PSRR = 20Log ----------------- Power supply rejection ratio is fixed by the internal design of the regulator. Additional rejection must be provided externally. The AS1374 is designed to deliver low noise and high PSRR, with low quiescent currents in battery-powered systems. The power-supply rejection is 85dB at 1kHz and 50dB at 100kHz. When operating from sources other than batteries, improved supply-noise rejection and transient response are achieved by increasing the values of the input and output capacitors. Additional passive LC filtering at the input can provide enhanced rejection at high frequencies. 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 maximum value in the datasheet. 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 = -10C. With X7R or X5R capacitors, a 1F capacitor should be sufficient at all operating temperatures. Larger output capacitor values (10F) help to reduce noise and improve load transient-response, stability and power-supply rejection. Page 24 Document Feedback ams Datasheet [v2-00] 2016-Jun-22 AS1374 - Application Information Input Capacitor An input capacitor at V IN is required for stability. It is recommended that a 1.0F capacitor be connected between the AS1369 power supply input pin V IN 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 V IN pin and returned to a clean analog ground. Any good quality ceramic, tantalum, or film capacitor may be used at the input. 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. 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: (EQ15) V TRANSIENT = I OUTPUT x R ESR Units are Volts, Amps, Ohms. Thus an initial +50mA change of output current will produce a -12mV transient when the ESR=240m. Do 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: (EQ16) T V TRANSIENT = I OUTPUT x R ESR + ------------------ C LOAD Units are Volts, Seconds, Farads, Ohms. Where: C LOAD 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. ams Datasheet [v2-00] 2016-Jun-22 Page 25 Document Feedback AS1374 - Application Information For instance 50mA load current step produces 50mV output drop if the LDO response is 1s and the load cap is 1F. 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. 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 (<1A). 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 160C 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 15C prevents low frequency oscillation between start-up and shutdown around the temperature threshold. Page 26 Document Feedback ams Datasheet [v2-00] 2016-Jun-22 AS1374 - Package Drawings & Markings Package Drawings & Markings The AS1374 is available in a 6-bump WLCSP package. Figure 32: 6-Bump WLCSP Package RoHS Green Note(s): 1. Pin 1 = A1 2. ccc coplanarity 3. All dimensions are in m. ams Datasheet [v2-00] 2016-Jun-22 Page 27 Document Feedback AS1374 - Package Drawings & Mark ings Figure 33: Package Marking YYYY XXXX Figure 34: Packaging Code Page 28 Document Feedback YYYY XXXX Marking Tracecode ams Datasheet [v2-00] 2016-Jun-22 AS1374 - Ordering & Contact Information Ordering & Contact Information The devices are available as the standard products shown in Figure 35. Figure 35: Ordering Information Ordering Code Marking Package Output Voltage 1 Output Voltage 2 Delivery Form Delivery Quantity AS1374-BWLT-285(1) ASSH 6-bump WLCSP 2.85V 2.85V Tape & Reel 10k pcs/reel AS1374-BWLT1833 ASSJ 6-bump WLCSP 1.8V 3.3V Tape & Reel 10k pcs/reel AS1374-BWLT1818 ASSP 6-bump WLCSP 1.8V 1.8V Tape & Reel 10k pcs/reel AS1374-BWLT1218 ASSK 6-bump WLCSP 1.2V 1.8V Tape & Reel 10k pcs/reel AS1374-BWLT1214 ASSY 6-bump WLCSP 1.2V 1.4V Tape & Reel 10k pcs/reel AS1374-BWLT18285 ASSZ 6-bump WLCSP 1.8V 2.85V Tape & Reel 10k pcs/reel AS1374-BWLT1212 ASSW 6-bump WLCSP 1.2V 1.2V Tape & Reel 10k pcs/reel AS1374-BWLT1827 ASTB 6-bump WLCSP 1.8V 2.7V Tape & Reel 10k pcs/reel AS1374-BWLT1533(1) ASTF 6-bump WLCSP 1.5V 3.3V Tape & Reel 10k pcs/reel AS1374-BWLT1820(1) ASTG 6-bump WLCSP 1.8V 2.0V Tape & Reel 10k pcs/reel AS1374-BWLT1821(1) ASTH 6-bump WLCSP 1.8V 2.1V Tape & Reel 10k pcs/reel AS1374-BWLT2533(1) ASTI 6-bump WLCSP 2.5V 3.3V Tape & Reel 10k pcs/reel AS1374-BWLT-1518(1) ASTK 6-bump WLCSP 1.5V 1.8V Tape & Reel 10k pcs/reel AS1374-BWLT-1530(1) ASTX 6-bump WLCSP 1.5V 3.0V Tape & Reel 10k pcs/reel AS1374-BWLT-2525(1) ASV7 6-bump WLCSP 2.5V 2.5V Tape & Reel 10k pcs/reel AS1374-BWLT-1825(1) ASV8 6-bump WLCSP 1.8V 2.5V Tape & Reel 10k pcs/reel AS1374-BWLT(2) ____ 6-bump WLCSP tbd tbd Tape & Reel 10k pcs/reel Note(s): 1. On request 2. Non-standard devices from 1.2V to 3.6V are available in 50mV steps. For more information and inquiries contact www.ams.com/contact ams Datasheet [v2-00] 2016-Jun-22 Page 29 Document Feedback AS1374 - Ordering & Contact Information Buy our products or get free samples online at: www.ams.com/ICdirect Technical Support is available at: www.ams.com/Technical-Support Provide feedback about this document at: www.ams.com/Document-Feedback For further information and requests, e-mail us at: ams_sales@ams.com For sales offices, distributors and representatives, please visit: www.ams.com/contact Headquarters ams AG Tobelbaderstrasse 30 8141 Premstaetten Austria, Europe Tel: +43 (0) 3136 500 0 Website: www.ams.com Page 30 Document Feedback ams Datasheet [v2-00] 2016-Jun-22 AS1374 - RoHS Compliant & ams Green Statement RoHS Compliant & ams Green Statement RoHS: The term RoHS compliant means that ams AG products fully comply with current RoHS directives. Our semiconductor products do not contain any chemicals for all 6 substance categories, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, RoHS compliant products are suitable for use in specified lead-free processes. ams Green (RoHS compliant and no Sb/Br): ams Green defines that in addition to RoHS compliance, our products are free of Bromine (Br) and Antimony (Sb) based flame retardants (Br or Sb do not exceed 0.1% by weight in homogeneous material). Important Information: The information provided in this statement represents ams AG knowledge and belief as of the date that it is provided. ams AG bases its knowledge and belief on information provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties. ams AG has taken and continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals. ams AG and ams AG suppliers consider certain information to be proprietary, and thus CAS numbers and other limited information may not be available for release. ams Datasheet [v2-00] 2016-Jun-22 Page 31 Document Feedback AS1374 - Copyrights & Disclaimer Copyrights & Disclaimer Copyright ams AG, Tobelbader Strasse 30, 8141 Premstaetten, 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. Devices sold by ams AG are covered by the warranty and patent indemnification provisions appearing in its General Terms of Trade. ams AG makes no warranty, express, statutory, implied, or by description regarding the information set forth herein. 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 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. This product is provided by ams AG "AS IS" and any express or implied warranties, including, but not limited to the implied warranties of merchantability and fitness for a particular purpose are disclaimed. ams 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 ams AG rendering of technical or other services. Page 32 Document Feedback ams Datasheet [v2-00] 2016-Jun-22 AS1374 - Document Status Document Status Document Status Product Preview Preliminary Datasheet Datasheet Datasheet (discontinued) ams Datasheet [v2-00] 2016-Jun-22 Product Status Definition Pre-Development Information in this datasheet is based on product ideas in the planning phase of development. All specifications are design goals without any warranty and are subject to change without notice Pre-Production Information in this datasheet is based on products in the design, validation or qualification phase of development. The performance and parameters shown in this document are preliminary without any warranty and are subject to change without notice Production Information in this datasheet is based on products in ramp-up to full production or full production which conform to specifications in accordance with the terms of ams AG standard warranty as given in the General Terms of Trade Discontinued Information in this datasheet is based on products which conform to specifications in accordance with the terms of ams AG standard warranty as given in the General Terms of Trade, but these products have been superseded and should not be used for new designs Page 33 Document Feedback AS1374 - Revision Information Revision Information Changes from 1.8 (2011-Dec-12) to current revision 2-00 (2016-Jun-22) Page Content of austriamicrosystems datasheet was converted to latest ams design Added benefits to Key Features Updated all drawings Updated Figure 6 5 Updated Typical Operating Characteristics section 8 Updated Package Drawings & Markings section 27 Updated Figure 35 29 Note(s): 1. Page and figure numbers for the previous version may differ from page and figure numbers in the current revision. 2. Correction of typographical errors is not explicitly mentioned. Page 34 Document Feedback ams Datasheet [v2-00] 2016-Jun-22 AS1374 - Content Guide Content Guide ams Datasheet [v2-00] 2016-Jun-22 1 1 2 3 General Description Key Benefits & Features Applications Block Diagram 4 5 6 8 Pin Assignment Absolute Maximum Ratings Electrical Characteristics Typical Operating Characteristics 19 19 19 19 19 Detailed Description Output Voltage Enable Current Limit Thermal Protection 20 20 21 21 22 23 23 23 23 24 24 24 24 25 25 25 26 26 Application Information Dropout Voltage Efficiency Power Dissipation Junction Temperature Explanation of Steady State Specifications Line Regulation Load Regulation Setting Accuracy Total Accuracy Explanation of Dynamic Specifications Power Supply Rejection Ratio (PSRR) Output Capacitor ESR Input Capacitor Noise Transient Response Turn On Time Thermal Protection 27 29 31 32 33 34 Package Drawings & Markings Ordering & Contact Information RoHS Compliant & ams Green Statement Copyrights & Disclaimer Document Status Revision Information Page 35 Document Feedback