600mA CMOS Low Power Low Noise LDO Voltage Regulator Description SE5121 Features The SE5121 series of fixed output low dropout linear regulators are designed for portable battery powered applications, which require low power consumption, low noise environment, and low dropout voltage. Each device contains a bandgap voltage reference, an error amplifier, a PMOS power transistor, and resistors for setting output ¾ Typical 175mV Dropout Voltage at 150mA. ¾ Excellent Line and Load Regulation. ¾ High Accuracy Output Voltage of 2%. ¾ Ultra-Low Ground Current at 35μA (Typ.) ¾ Over Current and thermal Protection. ¾ Standard SOT-89-3L Package. ¾ 100% Lead (Pb)-Free voltage, and current limit and temperature limit protection circuits. Application The SE5121 has been designed to be used with low cost capacitors and requires a minimum output capacitor of 1.0μF. Standard voltage versions are 1.5, 1.8, 2.5, 2.8, 3.0, 3.3, 3.5and 3.6V. Pin Configuration ¾ USB removable devices ¾ MPEG4 devices ¾ Wireless LAN’s ¾ Hand-Held Instrumentation. ¾ Portable DVD players ¾ Digital camera Ordering Information SE5121 _ _ _ PIN (1=>3): 1. G: OUT/GND/IN 2. N: GND/IN/OUT Package Type: 1. K: SOT-89-3L Block Diagram Output Voltage: 1. A: VOUT = 3.3V 2. B: VOUT = 2.8V 3. C: VOUT = 2.5V 4. D: VOUT = 1.8V 5. E: VOUT = 1.5V 6. F: VOUT = 3.0V 7. Y: VOUT = 3.5V 8. Q: VOUT = 3.6V Revision 12/4/2008 Preliminary and all contents are subject to change without prior notice © Seaward Electronics Inc., 2005. • www.seawardinc.com.cn • Page 1 600mA CMOS Low Power Low Noise LDO Voltage Regulator SE5121 Absolute Maximum Rating (1) Parameter Symbol Value Units Input Voltage VIN 6 V Output Voltage VOUT -0.3 to VIN V Power Dissipation PD Output Short Circuit Duration Internally Limited (3) Infinite Thermal Resistance, ΘJA Junction-to-Ambient Lead Temperature (Soldering, 5 sec.) 180 °C/W 260 °C Junction Temperature TJ 0 to +150 °C Storage Temperature TS -40 to +150 °C Parameter Symbol Value Units Supply Input Voltage VIN 5.5 V Junction Temperature TJ 0 to +125 °C Operating Rating (2) Electrical Characteristics VIN = 5V; CIN = 2.2μF; COUT = 2.2μF（Electrolytic Symbol VOUT Parameter capacitor）; IOUT = 10mA; TJ = 25°C; unless otherwise noted Conditions Min Typ Max SE5121 – 1.5(VIN=3.3V) 1.470 1.5 1.530 SE5121 – 1.8(VIN=3.3V) 1.764 1.8 1.836 SE5121 – 2.5 2.450 2.5 2.550 Output Voltage SE5121 – 2.8 2.744 2.8 2.856 Accuracy SE5121 – 3.0 2.940 3.0 3.060 SE5121 – 3.3 3.234 3.3 3.366 SE5121 – 3.5 3.430 3.5 3.570 SE5121 – 3.6 3.528 3.6 3.672 VIN = (VOUT + 0.8)V to 5.5V -- 0.2 -- %/V -- 2.0 -- % -- 0.1 -- mV/°C ΔVOUT Line Regulation ΔVOUT Load Regulation (5) VIN = (VOUT + 0.8)V to 2.5V IOUT = 10mA to 600mA Unit V Output Voltage ΔVOUT/ΔT Temperature Note 4 Coefficient Revision 12/4/2008 Preliminary and all contents are subject to change without prior notice © Seaward Electronics Inc., 2005. • www.seawardinc.com.cn • Page 2 600mA CMOS Low Power Low Noise LDO Voltage Regulator SE5121 Electrical Characteristics (Continued) VIN = 5V; CIN = 2.2μF; COUT = 2.2μF（Electrolytic Symbol VIN – VOUT capacitor）; IOUT = 10mA; TJ = 25°C; unless otherwise noted Parameter Conditions Min Typ Max IOUT = 10mA -- 5 -- IOUT = 150mA -- 175 -- IOUT = 250mA -- 300 -- IOUT = 600mA -- 800 -- Thermal Protection Temperature -- 150 -- Protection Hysterisys -- 20 -- Dropout Voltage (6) Unit mV TPROTECTION Thermal Protection °C PSRR Ripple Rejection f = 120 Hz -- 60 -- dB IQ Quiescent Current IOUT = 10mA -- 35 -- μA ILIMIT Current Limit 600 -- -- mA Note 1: Exceeding the absolute maximum rating may damage the device. Note 2: The device is not guaranteed to function outside its operating rating. Note 3: The maximum allowable power dissipation at any TA (ambient temperature) is calculated using: PD(MAX) = (TJ(MAX) – TA)/ΘJA. Exceeding the maximum allowable power dissipation will result in excessive die temperature, and the regulator will go into thermal shutdown. See “Thermal Consideration” section for details Note 4: Output voltage temperature coefficient is the worst case voltage change divided by the total temperature range. Note 5: Regulation is measured at constant junction temperature using low duty cycle pulse testing. Parts are tested for load regulation in the load range from 0.1mA to 600mA. Changes in output voltage due to heating effects are covered by the thermal regulation specification. Note 6: Dropout voltage is defined as the input to output differential at which the output voltage drops 2% below its nominal value measured at 1V differential. Note 7: The Cin or Cout should be chosen carefully. Please refer to the Application Hints Application Diagram Revision 12/4/2008 Preliminary and all contents are subject to change without prior notice © Seaward Electronics Inc., 2005. • www.seawardinc.com.cn • Page 3 600mA CMOS Low Power Low Noise LDO Voltage Regulator SE5121 Application Hints Thermal Considerations Like any low dropout regulator, SE5121 requires It is important that the thermal limit of the package is external capacitors to ensure stability. not exceeded. The The SE5121 has built-in thermal external capacitors must be carefully selected to protection. ensure performance. the IC will enter protection, and VOUT will be pulled Input Capacitor An input capacitor of at least 1μF is required. The inexpensive Electrolytic capacitor is preferred. The value can be increased without upper limit. to ground. When the thermal limit is exceeded, The power dissipation for a given application can be calculated as following: The power dissipation (PD) is PD = IOUT * [VIN – VOUT] Output Capacitor An output capacitor is required for stability. It must The thermal limit of the package is then limited to be placed no more than 1 cm away from the VOUT PD(MAX) = [TJ – TA]/ΘJA where TJ is the junction pin, and connected directly between VOUT and GND temperature, TA is the ambient temperature, and pins. ΘJA is around 180°C/W for SE5121. The inexpensive Electrolytic capacitor is SE5121 is recommended. The minimum value is 1μF but may designed to enter thermal protection at 150°C. For be increased without limit. example, if TA is 25°C then the maximum PD is limited to about 0.7W. In other words, if IOUT(MAX) = 600mA, then [VIN – VOUT] cannot exceed 1.7V. Revision 12/4/2008 Preliminary and all contents are subject to change without prior notice © Seaward Electronics Inc., 2005. • www.seawardinc.com.cn • Page 4 600mA CMOS Low Power Low Noise LDO Voltage Regulator SE5121 OUTLINE DRAWING SOT-89-3L DIM SOT-89 A C D J M K E F B L H G I A B C D E F G H I J K L M N DIMENSIONS INCHES MM MIN MAX MIN MAX 0.173 0.181 0.159 0.167 0.067 0.075 0.051 0.059 0.094 0.102 0.035 0.047 0.118REF 0.059REF 4.400 4.600 4.050 4.250 1.700 1.900 1.300 1.500 2.400 2.600 0.890 1.200 3.00REF 1.50REF 0.016 0.020 0.055 0.063 0.014 0.016 10°TYP 0.028REF 0.400 0.520 1.400 1.600 0.350 0.410 10°TYP 0.70REF Customer Support Seaward Electronics Incorporated – China Section B, 2nd Floor, ShangDi Scientific Office Complex, #22 XinXi Road Haidian District, Beijing 100085, China Tel: 86-10-8289-5700/01/05 Fax: 86-10-8289-5706 Seaward Electronics Corporation – Taiwan 2F, #181, Sec. 3, Minquan East Rd, Taipei, Taiwan R.O.C Tel: 886-2-2712-0307 Fax: 886-2-2712-0191 Seaward Electronics Incorporated – North America 1512 Centre Pointe Dr. Milpitas, CA95035, USA Tel: 1-408-821-6600 Last Updated - 12/4/2008 Revision 12/4/2008 Preliminary and all contents are subject to change without prior notice © Seaward Electronics Inc., 2005. • www.seawardinc.com.cn • Page 5