PL0501 500mA Low-Dropout Linear Regulator FEATURES 500mA high accuracy LDO Output voltage accuracy: ±1% Ultra low output noise 150μVRMS Very low dropout: 175mV @ 500mA Zero shutdown supply current TTL-logic-controlled enable input Thermal and current limit protections Ultra low droop load transient response Ultra fast line transient response Very small ( 1.2mm × 1.2mm × 0.6mm ) USP-3L package APPLICATIONS Cellular and cordless phones PDAs Battery powered portable equipment Notebook computers PC peripherals Wireless LAN cards MP3 / MP4 / CD Players Digital camera USB Hubs, USB 2.0 Mini PCI & PCI express cards DESCRIPTION The PL0501 is a CMOS low dropout linear regulator with ultra-low-noise output, very low dropout voltage and very low ground current. The PL0501 operates from a 2.5V to 5.5V input voltage range and delivers up to 500mA, with low dropout of 175mV at 500mA. Other features of the PL0501 include short-circuit protection and thermalshutdown protection. The PL0501 is designed especially for high powered portable devices. Its unique CMOS design offers excellent transient response with very low ground current. Other key application areas for the PL0501 include handheld computers, PCMCIA cards and WLAN cards. The PL0501 is available in USP-3L package. TYPICAL APPLICATION CIRCUIT July 2007 www.picsemi.com © 2007 Power IC. All Rights Reserved. 1 PL0501 PIN CONFIGURATION PIN DESIGNATOR Name IN GND Pin 1 2 Type Supply Ground EN 3 Logic input BYP/ PGD 4 Bypass/PGood OUT 5 Analog output July 2007 Function Supply voltage. 2.5V ~ 5.5V Ground pin Enable/Shutdown. TTL and CMOS compatible input. Logic ‘H’: enable, logic ‘L’: shutdown Reference voltage bypass pin. Connect 0.01µF ≤ CBYP ≤ 0.1µF to GND to reduce output noise. May be left open Regulator output www.picsemi.com © 2007 Power IC. All Rights Reserved. 2 PL0501 BLOCK DIAGRAM July 2007 www.picsemi.com © 2007 Power IC. All Rights Reserved. 3 PL0501 ABSOLUTE MAXIMUM RATINGS Symbol VIN VEN PD TSTG RθJA TJ,MAX TL ESD Parameter DC Supply Voltage at Pin 1 Enable Input Voltage at Pin 3 Continuous Power Dissipation Storage Temperature Range Thermal Resistance, Junction-To-Air Operating Junction Temperature Lead Temperature (Soldering, 5sec) ESD Capability, HBM Model Value -0.3 to +6.0 -0.3 to +6.0 Internally limited -65 to +150 +235 -40 to +125 +260 2.0 Unit V V W °C °C/W °C °C KV ELECTRICAL CHARACTERISTICS ( All specifications are at TA = 25°C. VIN = VOUT ( NOMINAL ) + 1V OR 2.5V whichever is greater, VEN = VIN, CIN = COUT = 1µF, unless otherwise specified.) Symbol Parameter Test Conditions Min Typ Max Unit VIN Supply Voltage 2.5 5.5 V IO = 1mA, TA = +25°C -1.0 +1.0 % Output Voltage Accuracy IO = 1mA to 500mA, -1.25 +1.25 % TA = +25°C VDP Dropout Voltage (Note 1) ILOAD = 500mA 175 mV ILOAD = 100mA 60 mV IMAX Maximum Output Current Continuous 500 mA RMS ILIM Short Circuit Current Limit VOUT < 90% of V NOM 1500 mA IQ Shutdown Quiescent Current VEN < 0.4V 0.01 0.5 µA IG ΔVLINE ΔVLOAD PSRR eNO July 2007 Ground Pin Current ILOAD = 1mA VIN = VOUT + 1V (or 2.5V, Line Regulation dVOUT/dVIN whichever is greater) to 5.5V, IO = 1 mA Load Regulation ILOAD = 1mA to 500mA Ripple Rejection, COUT= 1µF, f = 100 Hz CBYP = 10nF, ILOAD = 10mA f = 10 KHz Output Voltage Noise COUT = 10µF, CBYP = 10nF, www.picsemi.com © 2007 Power IC. All Rights Reserved. 205 75 70 150 300 nA 0.1 %/V 1 % dB µVRMS 4 PL0501 OVER TEMPERATURE PROTECTION Symbol Parameter Thermal Shutdown Temperature Thermal Shutdown Hysteresis Test Conditions Min Typ 165 20 Max Unit °C °C Test Conditions Min 1.2 Typ Max Unit V V µA µS ENABLE INPUT Symbol VIH VIL IEN Parameter Logic Input High Voltage Logic Input Low Voltage Logic Input Current Shutdown Exit Delay 0.4 1 -1 VEN = 0 to 5.5V, CBYP = 10nF, COUT = 1µF 90 Note 1: The Dropout Voltage is defined as VIN - VOUT, when VIN = VOUT ( NOM ) July 2007 www.picsemi.com © 2007 Power IC. All Rights Reserved. 5 PL0501 TYPICAL OPERATING CHARACTERSTICS (All specifications are at TA = 25°C , unless otherwise specified) (Not Available) July 2007 www.picsemi.com © 2007 Power IC. All Rights Reserved. 6 PL0501 OPERATION The PL0501 is an ultra-low-noise, low-dropout, lowquiescent current linear regulator designed for spacerestricted applications. It is available with preset output voltages ranging from 1.5V to 5.0V in 100mV increments. It can supply loads of up to 500mA. As shown in the Block Diagram, the PL0501 consists of a highly accurate band gap core, noise bypass circuit, error amplifier, Pchannel pass transistor and an internal feedback voltage divider. The PL0501 allows for an adjustable output with an external feedback network. The 1.0V band gap 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. The output voltage is fed back through an internal resistor voltage-divider connected to the OUT pin. An external bypass capacitor connected to BYP (PL0501-BYP) reduces the noise at the output. Additional blocks include a current limiter, over temperature protection and shutdown logic. Internal P-Channel Pass Transistor The PL0501 features a 1Ω (typical) P-channel MOSFET pass transistor. This provides several advantages over similar designs using a PNP pass transistor, including longer battery life. The P-channel MOSFET requires no base drive, which considerably reduces the quiescent current. PNP-based regulators waste considerable current in dropout when the pass transistor saturates. They also use high base-drive current under heavy loads. The PL0501 does not suffer from these problems and consumes only 90μA of quiescent current. Output Voltage Selection The PL0501 is supplied with factory-set output voltages from 1.5V to 5.0V, in 100mV increments. The PL0501 features a user-adjustable output through an external feedback network (see Typical Application). July 2007 To set the output of the PL0501, use the following equation: VOUT = VREF × [1 + (R1/R2)] Where R2 is chosen to be less than 240KΩ and VREF = 1.0V. Use 1% or better resistors. Current Limit The PL0501 includes a current limiter. It monitors the output current and controls the pass transistor’s gate voltage to limit the output current under 1500mA (typical). The output can be shorted to ground for an indefinite amount of time without damaging the part. The short circuit current limit is increased to approximately 1500mA (typical) when the output voltage is within 10% of the nominal output, thus improving the performance of large pulsating loads. The in-regulation current limit option provides the user to overload the device, maintaining a continuous 500mA (RMS) load. Enable Input The PL0501 features an active-high Enable input (EN) pin that allows on/off control of the regulator. The PL0501 bias current reduces to ZERO (leakage current) when it goes into shutdown. The Enable input is TTL/CMOS compatible for simple logic interfacing. When EN is ‘H,’ the output voltage startup rising time is typically 25µs. Connect EN pin to IN pin for normal operation. Power Good Flag The PL0501 features a Power Good flag (PGD), which monitors the output voltage and signals an error condition when the output voltage drops 10% below its nominal value. Under Voltage Lockout When the input supply goes too low (typically below 2.0V), the PL0501 produces an internal UVLO (Under Voltage Lockout) signal that generates a fault signal and shuts down the chip. This mechanism protects the chip from producing false logic due to low input supply. www.picsemi.com © 2007 Power IC. All Rights Reserved. 7 PL0501 Quick Charging Mode The PL0501 has a quick charge block to get the reference up very quickly by charging the BYP capacitor with very high current when the chip comes out of shut down. This quick charge block stops charging the BYP capacitor when the reference reaches 95% of its nominal value and then the chip switches out of quick charging mode to normal operating mode. Over Temperature Protection Over temperature protection limits the total power dissipation in the PL0501. When the junction temperature exceeds TJ = +165°C, the thermal sensor signals the shutdown logic and turns off the pass transistor. The thermal sensor turns the pass transistor on again after the IC’s junction temperature drops by 20°C, resulting in a pulsed output during continuous thermal-overload conditions. Thermal-overload protection is designed to protect the PL0501 in the event of a fault condition. For continuous operation, do not exceed the absolute maximum junction temperature rating of TJ = +150°C. Operating Region and Power Dissipation The PL0501’s maximum power dissipation depends on (1) the thermal resistance of the case and circuit board, (2) the temperature difference between the die junction and ambient and (3) the rate of airflow. The power dissipation across the device is: P = IOUT × (VIN – VOUT) The maximum power dissipation is: PMAX = (TJ – TA)/(θJC + θCA) Where (TJ – TA) is the temperature difference between the PL0501 die junction and the surrounding air, θJC is the thermal resistance of the package and θCA is the thermal resistance through the PC board, copper traces and other materials to the surrounding air. The GND pin of the PL0501 performs the dual function of providing an electrical connection to ground and channeling heat away. Connect the GND pin to ground using a large pad or ground plane. APPLICATION INFORMATION Capacitor Selection And Regulator Stability Use a 1.0μF capacitor on the PL0501 input and a 1.0μF capacitor on the output. Large input capacitor values and lower ESR provide better noise rejection and linetransient response. Reduce output noise and improve load-transient response, stability and power-supply rejection by using large output capacitors. Note that some ceramic dielectrics exhibit large capacitance and ESR variation with temperature. With dielectrics such as Z5U and Y5V, it may be necessary to use a 2.2μF or larger output capacitor to ensure stability at temperatures below -10°C. With X7R or X5R dielectrics, 1μF is sufficient at all operating temperatures. Use a 0.01μF bypass capacitor at BYP (PL0501-BYP) for low-output voltage noise. The leakage current going into the BYP pin should be less than 10nA. Noise, PSRR and Transient Response The PL0501 is designed to deliver ultra-low noise and high PSRR, as well as low dropout and low quiescent currents in battery-powered systems. The PL0501 PSRR is 75dB at 100Hz and 70dB at 10KHz. When operating from sources other than batteries, improved supply-noise rejection and transient response can be achieved by increasing the values of the input and output bypass capacitors and through passive filtering techniques. Dropout Voltage A regulator’s minimum dropout voltage determines the lowest usable supply voltage. In battery-powered systems, this determines the useful end-of-life battery voltage. Because the PL0501 uses a P-channel MOSFET pass transistor, its dropout voltage is a function of drainto-source on resistance (RDSON) multiplied by the load current. Noise Reduction For the PL0501, an external 0.01μF bypass capacitor between BYP and GND with innovative noise bypass scheme reduces the output noises dramatically, exhibiting 100μV (RMS) of output voltage noise with CBYP = 0.01μF and COUT = 10μF. July 2007 www.picsemi.com © 2007 Power IC. All Rights Reserved. 8 PL0501 PACKAGE INFORMATION 5-PIN SOT-25 OUTLINE DIMENSION D Detail A b 4 E E1 5 1 e c 3 1 R R θ A A2 1 L2 e1 L θ A1 θ L1 1 Detail A Dimension: Symbol A A1 A2 b c D E E1 e e1 L L1 L2 R R1 θ˚ θ1˚ July 2007 Min 0.90 0.30 0.08 0.30 0.10 0.10 0˚ 5˚ Millimeter Typ 1.15 2.90 2.80 1.60 0.95 1.90 0.45 0.60 0.25 4˚ 10˚ Max 1.45 0.15 1.30 0.50 0.22 Min 0.036 0.011 0.003 0.60 0.020 0.25 8˚ 15˚ 0.004 0.004 0˚ 5˚ www.picsemi.com © 2007 Power IC. All Rights Reserved. Inch Typ 0.045 0.114 0.110 0.063 0.037 0.075 0.018 0.024 0.010 4˚ 10˚ Max 0.057 0.006 0.051 0.020 0.009 0.024 0.010 8˚ 15˚ 9 PL0501 DISCLAIMERS LIFE SUPPORT Power IC’s products are NOT designed to be used as components in devices intended to support or sustain human life. The use of Power IC’s products in components intended for surgical implants into the body or other applications, in which failure of Power IC’s products could create a situation where personal death or injury may occur, is NOT authorized without the express written approval of Power IC’s Chief Executive Officer. Power IC will NOT be held liable for any damages or claims resulting from the use of its products in medical applications. MILITARY Power IC’s products are NOT designed for use in military applications. The use of Power IC’s products in military applications is NOT authorized without the express written approval of Power IC’s Chief Executive Officer. Power IC will NOT be held liable for any damages or claims resulting from the use of its products in military applications. RIGHT TO MAKE CHANGES Power IC reserves the right to change this document and/or this product without notice. Customers are advised to consult their Power IC sales representative before ordering. July 2007 www.picsemi.com © 2007 Power IC. All Rights Reserved. 10