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| 1.0A Low Dropout Voltage Regulator with Enable POWER MANAGEMENT Description 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 10A in shutdown mode reduces power dissipation. The SC1541 is available with three different voltage options as standard and two package options, SO-8 and 5-lead TO-263. SC1541 Features 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 10A 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 Low voltage microcontrollers Switching power supply post-regulation Instantly available circuits Motherboards Battery operated equipment Typical Application Circuit U1 V IN ENABLE SIGNAL IN EN SC1541 OUT V OUT GND C1 10uF Tantalum 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 Maximum Input Pin Voltage Power Dissipation Thermal Resistance Junction to Case SO-8 TO-263 Thermal Resistance Junction to Ambient SO-8(1) TO-263 Operating Junction Temperature Range Storage Temperature Range Lead Temperature (Soldering) 10 Sec Symbol VIN, VEN PD J C Maximum 7 Internally Limited 39 3 65 60 0 to 125 -65 to 150 300 Units V W C/W J A TJ TSTG TLEAD C/W C C 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 (1) Symbol VOUT VIN = 5V, IOUT = 0mA Min -1 -2 Typ VOUT Max +1 +2 Units % Line Regulation(1) Load Regulation(1) Dropout Voltage(1)(2) Current Limit(1) Quiescent Current REG(LINE) REG(LOAD) VD ICL IQ IOUT = 10mA VIN = 5V IOUT = 1A 1.1 VIN = VEN = 5V 0.035 0.2 1.10 0.2 0.4 1.30 % % V A 5 7 10 mA VIN = 5V, VEN < 0.25V 6 8 10 A Enable Pin Control Voltage V EN Device OFF Device ON 0.25 0.45 (VOUT + 0.5) 0.1 15 (VOUT + 0.8) 1.0 25 V Enable Pin Current IEN VEN = 0V, VIN = 5V (OFF) VEN = VIN = 5V (ON) A 2004 Semtech Corp. 2 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 Temperature Coefficient Temperature Stability RMS Output Noise(3) Ripple Rejection Ratio(4) Symbol TC TS VN RA VIN = 5V Min Typ 0.005 0.5 0.003 Max Units %/C % %VOUT dB 60 72 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) P ackag e TO-263-5 SO-8 SO-8 TO-263-5 PIN 1 2 3/TAB 4 5 FUNCTION EN GND OUT IN NC 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. Block Diagram Pin Descriptions Pin Name EN GND NC IN OUT SO-8 Pin # 1 2 4 3 5, 6, 7, 8 TO-263-5 Pin # 1 2 5 4 3/TAB Pin Function Active high enable for the regulator output. Connect to VIN if not being used. Ground pin. Bottom end of the internal feedback resistor chain. No connection. This is the input supply pin for the device. This is the power output of the device. This pin is electrically connected to the tab of the TO-263-5 package. 2004 Semtech Corp. 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 |
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