AS1358-BTTT-285

Datasheet AS1358/AS1359 150mA/300mA, Ultra-Low-Noise, High-PSRR Low Dropout Regulators 1 General Description 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 1. Table 1. Standard Products Model AS1358 AS1359 Load Current 150mA 300mA Output Voltage Preset – 1.5 to 4.5V Preset – 1.5 to 4.5V 2 Key Features ! ! ! ! ! ! ! ! ! ! ! Preset Output Voltages: 1.5 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 Overcurrent and Thermal Protection TSOT23 5-pin Package 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. 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 1. Typical Application Circuit Input 2V to 5.5V CIN 1µF 1 IN 5 OUT Output 1.5V to 4.5V 2 GND AS1358/ AS1359 On Off 3 SHDNN 4 CBYPASS 10nF COUT 1µF BYPASS www.austriamicrosystems.com Revision 1.04 1 - 14 AS1358/AS1359 Datasheet - P i n o u t 4 Pinout Pin Assignments Figure 2. Pin Assignments (Top View) IN 1 5 OUT GND 2 AS1358/ AS1359 SHDNN 3 4 BYPASS TSOT23 5-pin Pin Descriptions Table 2. Pin Descriptions Pin Number 1 2 3 4 Pin Name IN GND SHDNN BYPASS Unregulated Input Supply. Ground Shutdown. Pull this pin low to disable the LDO. Noise Bypass for Low-Noise Operation. Connect a 10nF capacitor from this pin to OUT. Note: This pin is shorted to GND in shutdown mode. Regulated Output Voltage. Bypass this pin with a capacitor to GND. See Capacitor Selection and Regulator Stability on page 11 for more details. Description 5 OUT www.austriamicrosystems.com Revision 1.04 2 - 14 AS1358/AS1359 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 IN to GND OUT, SHDNN to GND BYPASS to GND Output Short-Circuit Duration Thermal Resistance ΘJA Operating Temperature Range Junction Temperature Storage Temperature Range -65 -40 Min -0.3 -0.3 -0.3 Max +7 IN + 0.3 OUT + 0.3 Infinite 201.7 +85 +150 +150 ºC/W ºC ºC ºC The reflow peak soldering temperature (body temperature) specified is in accordance with IPC/JEDEC J-STD-020D “Moisture/Reflow Sensitivity Classification for Non-Hermetic Solid State Surface Mount Devices”. The lead finish for Pb-free leaded packages is matte tin (100% Sn). on PCB Units V V V Comments Package Body Temperature +260 ºC www.austriamicrosystems.com Revision 1.04 3 - 14 AS1358/AS1359 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 VIN = VOUT +0.5V, CIN = 1µF, COUT = 1µF, CBYPASS = 10nF, TAMB = -40 to +85ºC (unless otherwise specified). Typ values are at TAMB = +25ºC. Table 4. Electrical Characteristics Symbol VIN Parameter Input Voltage Range IOUT = 1mA, TAMB = +25ºC IOUT = 100µA to 150mA, TAMB = +25ºC (AS1358) Output Voltage Accuracy IOUT = 100µA to 300mA, TAMB = +25ºC (AS1359) IOUT = 100µA to 150mA, (AS1358) IOUT = 100µA to 300mA, (AS1359) IOUT ILIMIT Maximum Output Current Current Limit AS1358 AS1359 AS1358, OUT = 90% of nom., TAMB = +25ºC AS1359, OUT = 90% of nom., TAMB = +25ºC VOUT ≥ 3V, IOUT = 150mA VOUT ≥ 3V, IOUT = 300mA, (AS1359 only) 2.5V ≤ VOUT < 3V, IOUT = 150mA Dropout Voltage 1 Condition Min 2 -0.5 -0.75 -1.0 -1.5 -2.0 150 300 Typ Max 5.5 +0.5 +0.75 +1.0 +1.5 +2.0 Unit V % mA 270 510 70 140 90 170 140 270 40 150 0.02 0.0005 9 92 80 62 9 µV dB 500 95 200 120 230 190 350 90 250 µA %/V %/mA nA mV mA 2.5V ≤ VOUT < 3V, IOUT = 300mA, (AS1359 only) 2.0V ≤ VOUT < 2.5V, IOUT = 150mA 2.0V ≤ VOUT < 2.5V, IOUT = 300mA, (AS1359 only) IQ VLNR VLDR ISHDNN PSRR Quiescent Current Line Regulation Load Regulation Shutdown Supply Current Ripple Rejection IOUT = 0.05mA VIN = VOUTNOM - 0.1V, IOUT = 0mA VIN = (VOUT +0.5V) to 5.5V, IOUT = 0.1mA IOUT = 1 to 150/300mA SHDNN = 0V f = 1kHz, IOUT = 10mA f = 10kHz, IOUT = 10mA f = 100kHz, IOUT = 10mA f = 100Hz to 100kHz, ILOAD = 0 to 150/300mA RLOAD = 50Ω VIN = 2 to 5.5V VIN = 2 to 5.5V 1.5 Output Noise Voltage (RMS) Shutdown Shutdown Exit Delay 2 300 0.4 µs V V SHDNN Logic Low Level SHDNN Logic High Level www.austriamicrosystems.com Revision 1.04 4 - 14 AS1358/AS1359 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 Thermal Shutdown Temperature Thermal Shutdown Hysteresis Condition Min Typ Max Unit Thermal Protection TSHDNM ΔTSHDN M 160 15 ºC ºC 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. Note: All limits are guaranteed. The parameters with min and max values are guaranteed with production tests or SQC (Statistical Quality Control) methods. www.austriamicrosystems.com Revision 1.04 5 - 14 AS1358/AS1359 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 + 0.5V, CIN = COUT = 1µF, CBYPASS = 10nF, TAMB = 25°C (unless otherwise specified). Figure 3. Output Voltage vs. Input Voltage 3.5 Figure 4. Output Voltage Accuracy vs. Load Current 0.5 . Output Voltage Deviation (%) 3 0.4 IOUT = 150mA Output Voltage (V) . 0.3 0.2 0.1 0 -0.1 -0.2 -0.3 -0.4 -0.5 0 50 100 150 200 250 300 Temp = 85°C Temp = -45°C Temp = 25°C 2.5 IOUT = 300mA 2 1.5 1 0.5 0 0 1 2 3 4 5 6 Input Voltage (V) Load Current (mA) Figure 5. Output Voltage Accuracy vs. Temperature 1 Figure 6. Dropout Voltage vs. Load Current 140 . 0.8 Output Voltage Deviation (%) 0.6 0.4 0.2 0 -0.2 -0.4 -0.6 -0.8 -1 -40 -15 10 35 60 85 Dropout Voltage (mV) . 120 100 80 60 40 20 0 0 50 100 150 200 250 300 Temp = 85°C Temp = 25°C Temp = -45°C Temperature (°C) Load Current (mA) Figure 7. Dropout Voltage vs. Output Voltage 80 Dropout Voltage (mV) . 70 60 50 40 30 20 10 0 2 2.2 2.4 2.6 2.8 3 3.2 Output Voltage (V) www.austriamicrosystems.com Revision 1.04 6 - 14 AS1358/AS1359 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 8. Ground Pin Current vs. Input Voltage 150 Figure 9. Ground Pin Current vs. Load Current 80 75 70 65 60 55 50 45 40 35 . Ground Pin Current (µA) 100 75 50 25 0 0 1 2 3 4 5 6 IOUT= 300mA IOUT = 150mA IOUT = 0mA Ground Pin Current (µA) 125 . 0 50 100 150 200 250 300 Input Voltage (V) Load Current (mA) Figure 10. Ground Pin Current vs. Temperature 50 Figure 11. PSRR vs. Frequency; IOUT = 10mA 100 . 45 Ground Pin Current (µA) 80 40 PSRR (dB) -15 10 35 60 85 60 35 40 30 20 25 -40 0 0.01 1 100 10000 Temperature (°C) Frequency (kHz) Figure 12. Output Noise Spectral Density vs. Freq. . 10000 Figure 13. Output Noise vs. Bypass Capacitance 15 14 13 Output Noise Density (nV/ Hz) . Noise (µVrms) 0.1 1 10 100 1000 12 11 10 9 8 7 6 100 10 0.01 5 1 10 100 Frequency (kHz) Capacitance (nF) www.austriamicrosystems.com Revision 1.04 7 - 14 AS1358/AS1359 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 14. Load Transient Response, VIN = 3.8V, VOUT = 3.3V Figure 15. Load Transient Response near Dropout, VIN = 3.4V, VOUT = 3.3V 20mA/Div 20mV/DIV 200µs/Div 200µs/Div Figure 16. Line Transient Response Figure 17. Enter & Exit Shutdown Delay 500mV/Div VIN SHDNN 200µs/Div 20mV/DIV VOUT VOUT 200µs/Div www.austriamicrosystems.com Revision 1.04 2V/Div 2V/Div 20mV/DIV VOUT VOUT 20mA/Div IOUT IOUT 8 - 14 AS1358/AS1359 Datasheet - D e t a i l e d D e s c r i p t i o n 8 Detailed Description The AS1358/AS1359 are ultra-low-noise, low-dropout, low-quiescent current linear-regulators specifically designed for space-limited applications. The devices are available with preset output voltages from 1.5 to 4.5V in 50mV increments. These devices can supply loads up to 150/300mA. As shown in Figure 18, the AS1358/AS1359 consist of an integrated bandgap core and noise bypass circuitry, error amplifier, P-channel MOSFET pass transistor, and internal feedback voltage-divider. The output voltage is fed back through an internal resistor voltage-divider connected to pin OUT. An external bypass capacitor connected to pin BYPASS reduces noise at the output. Additional blocks include a current limiter, thermal sensor, and shutdown logic. Internal Voltage Reference The 1.25V bandgap reference is connected to the error amplifier’s inverting input. 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 pass-transistor gate is pulled low. This allows 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 high, allowing less current to pass to the output. Internal P-Channel Pass Transistor The AS1358/AS1359 feature a 0.5Ω (typ) P-channel MOSFET pass transistor, which provides several advantages over similar designs using a PNP pass transistor, including prolonged battery life. The P-channel MOSFET does not require a base driver, thus quiescent current is dramatically reduced. The AS1358/AS1359 LDOs do not exhibit problems associated with typical PNP-based LDOs, and consume only 40µA of quiescent current in light load and 220µA in dropout (see Typical Operating Characteristics on page 6). Output Voltage The AS1358/AS1359 deliver preset output voltages from 1.5 to 4.5V, in 50mV increments (see Ordering Information on page 13). Shutdown The AS1358/AS1359 feature a low-power shutdown mode that reduces quiescent current to