SC1541 1.0A Low Dropout Voltage Regulator with Enable POWER MANAGEMENT Description Features The SC1541 is a high performance low dropout positive voltage regulator designed for use in applications where power management is critical, such as battery powered systems. Additionally, the SC1541 provides excellent regulation over variations in line, load and temperature. Outstanding features include low dropout performance at rated current, fast transient response, internal current limiting and thermal shutdown protection of the output device. A very low quiescent current of 10µA in shutdown mode reduces power dissipation. Low dropout performance, 1.3V max Full current rating over line and temperature Fast transient response +2% total output regulation over line, load and temperature 10µA max. quiescent current in shutdown Three fixed output voltages Line regulation 0.2% max. Load regulation 0.4% max. SO-8 and TO-263 packages Applications The SC1541 is available with three different voltage options as standard and two package options, SO-8 and 5-lead TO-263. Low voltage microcontrollers Switching power supply post-regulation Instantly available circuits Motherboards Battery operated equipment Typical Application Circuit V IN U1 SC1541 IN OUT EN ENABLE SIGNAL C1 10uF Tantalum V OUT GND C2 10uF min. Tantalum Notes: (1) Input and output capacitors should be located close to the device. (2) Connect all pins to PCB (SO-8 package) for optimal thermal characteristics. (3) Increasing the output capacitor value will improve the overall transient response. (4) The device is enabled when VEN = VIN, and shut down when EN is pulled to ground. EN should not be taken higher than VIN. A CMOS signal referenced to VIN would be ideal for switching the SC1541 on and off. Revision: February 11, 2004 1 www.semtech.com SC1541 POWER MANAGEMENT Absolute Maximum Ratings Exceeding the specifications below may result in permanent damage to the device, or device malfunction. Operation outside of the parameters specified in the Electrical Characteristics section is not implied. Parameter Symbol Maximum Units Maximum Input Pin Voltage VIN, VEN 7 V Power Dissipation PD Internally Limited W Thermal Resistance Junction to Case SO-8 TO-263 θJ C 39 3 °C/W Thermal Resistance Junction to Ambient SO-8(1) TO-263 θJ A 65 60 °C/W Operating Junction Temperature Range TJ 0 to 125 °C Storage Temperature Range TSTG -65 to 150 °C Lead Temperature (Soldering) 10 Sec TLEAD 300 °C Note: (1) 1 inch square of 1/16” FR-4, double sided, 1 oz. minimum copper weight. Electrical Characteristics Unless otherwise specified: IO = 0mA to 1A, VEN = VIN, 1.8V Option: VIN = 3.2V to 7.0V, 2.5 Option: VIN = 3.9V to 7.0V, 3.3V Option: VIN = 4.7V to 7.0V. Values in bold apply over full operating temperature range. Parameter Output Voltage Symbol (1) VOUT VIN = 5V, IOUT = 0mA Min Typ Max Units -1 VOUT +1 % -2 +2 Line Regulation(1) REG(LINE) IOUT = 10mA 0.035 0.2 % Load Regulation(1) REG(LOAD) VIN = 5V 0.2 0.4 % Dropout Voltage(1)(2) VD IOUT = 1A 1.10 1.30 V Current Limit(1) ICL Quiescent Current IQ 1.1 VIN = VEN = 5V A 5 7 mA 10 VIN = 5V, VEN < 0.25V 6 8 µA 10 Enable Pin Control Voltage Enable Pin Current 2004 Semtech Corp. V EN IEN Device OFF 0.25 0.45 V Device ON (VOUT + 0.5) (VOUT + 0.8) VEN = 0V, VIN = 5V (OFF) 0.1 1.0 VEN = VIN = 5V (ON) 15 25 2 µA www.semtech.com SC1541 PRELIMINARY POWER MANAGEMENT Electrical Characteristics (Cont.) Unless otherwise specified: IO = 0mA to 1A, VEN = VIN, 1.8V Option: VIN = 3.2V to 7.0V, 2.5 Option: VIN = 3.9V to 7.0V, 3.3V Option: VIN = 4.7V to 7.0V. Values in bold apply over full operating temperature range. Parameter Symbol Min Typ Max Units Temperature Coefficient TC 0.005 %/C Temperature Stability TS 0.5 % RMS Output Noise(3) VN 0.003 %VOUT Ripple Rejection Ratio(4) RA 72 dB VIN = 5V 60 Notes: (1) Low duty cycle pulse testing with Kelvin connections required. (2) ∆VOUT, ∆VREF = 1%. (3) Bandwidth of 10 Hz to 10kHz. (4) 120Hz input ripple. (5) This device is ESD sensitive. Use of standard ESD handling precautions is required. 2004 Semtech Corp. 3 www.semtech.com SC1541 POWER MANAGEMENT Pin Configurations Ordering Information Device(1)(2) SC1541CM-X.X.TR SC1541CM-X.X.TRT(3) SC1541CS-X.X.TR SC1541CS-X.X.TRT(3) TO-263-5 FUNCTION 1 EN 2 GND 3/TAB OUT 4 IN 5 NC TO-263-5 SO-8 Notes: (1) Where X.X denotes voltage options. Available voltages are: 1.8V, 2.5V and 3.3V. Contact factory for additional voltage options. (2) Only available in tape and reel packaging. A reel contains 800 (TO-263-5) or 2500 (SO-8) devices. (3) Lead free product. SO-8 PIN P ackag e Block Diagram Pin Descriptions Pin Name SO-8 Pin # TO-263-5 Pin # EN 1 1 Active high enable for the regulator output. Connect to VIN if not being used. GND 2 2 Ground pin. Bottom end of the internal feedback resistor chain. NC 4 5 No connection. IN 3 4 This is the input supply pin for the device. OUT 5, 6, 7, 8 3/TAB 2004 Semtech Corp. Pin Function This is the power output of the device. This pin is electrically connected to the tab of the TO-263-5 package. 4 www.semtech.com SC1541 POWER MANAGEMENT Outline Drawing - SO-8 Land Pattern - SO-8(1) Note: (1) More copper area should be used to lower RTH(J-A) as needed. 2004 Semtech Corp. 5 www.semtech.com SC1541 POWER MANAGEMENT Outline Drawing - TO-263-5L Land Pattern - TO-263-5L(1) Note: (1) More copper area should be used to lower RTH(J-A) as needed. Contact Information Semtech Corporation Power Management Products Division 200 Flynn Road, Camarillo, CA 93012 Phone: (805)498-2111 FAX (805)498-3804 2004 Semtech Corp. 6 www.semtech.com