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| 150mA CMOS Low Noise LDO Voltage Regulator (Preliminary) Description The SE5508 series of fixed output low dropout linear regulators are designed for portable battery powered applications, which require low noise environment, fast enable response time, and low dropout voltage. An optional bypass capacitor can be added for better low-noise performance. Each device contains a voltage reference unit, an error amplifier, a PMOS power transistor, and resistors for setting output voltage, and current limit and temperature limit protection circuits. The SE5508 has been designed to be used with low cost capacitors and requires a minimum output capacitor of 1.0F. Standard voltage versions are 1.5, 1.8, 2.5, 2.8, 3.0, and 3.3V. SE5508 Features Excellent Noise Rejection at 62 dB. Typical Low Dropout Voltage of 200mV at 75mA. Fast Enable Turn-On Time of 20s (Typ.) Excellent Line and Load Regulation. High Accuracy Output Voltage of 2%. Typical Low Ground Current at 50A Typical Disable Current Less than 0.1A Thermal Protection. Standard SOT23-5L and SC70 (SOT353) Package. Available in Lead-Free Packages. Applications Cellphones. Wireless LAN's. Hand-Held Instrumentation. Portable Video Game Devices. Digital Cameras. Pin Configuration Ordering Information SE5508 _ __ Pin (1=>5): G: VIN/GND/EN/BYPASS/VOUT Package: L: SOT-23-5L P: SC70 (SOT353) Output Voltage: A: VOUT = 3.3V B: VOUT = 2.8V C: VOUT = 2.5V D: VOUT = 1.8V E: VOUT = 1.5V F: VOUT = 3.0V Preliminary and all contents are subject to change without prior notice. (c) Seaward Electronics, Inc., 2005. * www.seawardinc.com.cn * Page 1 150mA CMOS Low Noise LDO Voltage Regulator (Preliminary) Absolute Maximum Rating (1) Parameter Input Voltage Enable Voltage Output Voltage Power Dissipation Output Short Circuit Duration Thermal Resistance, Junction-to-Ambient Lead Temperature (Soldering, 5 sec.) Junction Temperature Storage Temperature TJ TS JA Symbol VIN VEN VOUT PD Value 6 -0.3 to VIN -0.3 to VIN Internally Limited (3) Infinite 230 C/W Units V V V SE5508 260 0 to +150 -40 to +150 C C C Operating Rating (2) Parameter Supply Input Voltage Junction Temperature Symbol VIN TJ Value +2.0V to +5.5 0 to +125 Units V C Electrical Characteristics VIN = 5V; CIN = 2.2F; COUT = 2.21F; IOUT = 10mA; TJ = 25C; unless otherwise noted Symbol Parameter Conditions SE5508 - 1.5 SE5508 - 1.8 Min 1.470 1.764 2.450 2.744 2.940 3.234 -- Typ 1.5 1.8 2.5 2.8 3.0 3.3 1 Max 1.530 1.836 2.550 2.856 3.060 3.366 -- Unit V V V V V %/V VOUT Output Voltage Accuracy SE5508 - 2.5 SE5508 - 2.8 SE5508 - 3.0 SE5508 - 3.3 VOUT VOUT Line Regulation Load Regulation (5) Output Voltage VIN = VOUT + 1V to 6V, IOUT = 10mA (VOUT = 3.3V) VIN = 5V; IOUT = 10mA to 150mA (VOUT = 3.3V) Note 4 -- 1 -- % VOUT/T Temperature Coefficient -- 0.033 -- mV/C Preliminary and all contents are subject to change without prior notice. (c) Seaward Electronics, Inc., 2005. * www.seawardinc.com.cn * Page 2 150mA CMOS Low Noise LDO Voltage Regulator (Preliminary) Electrical Characteristics (Continued) VIN = 5V; CIN = 2.2F; COUT = 2.2F; IOUT = 10mA; TJ = 25C; unless otherwise noted SE5508 Symbol Parameter Dropout Voltage (6) Conditions IOUT = 10mA Min -------- Typ 20 200 500 150 20 62 0.1 Max -------- Unit VIN - VOUT IOUT = 75mA IOUT = 150mA mV TPROTECTION PSRR Thermal Protection Ripple Rejection Thermal Protection Temperature Protection Hysterisys f = 120 Hz VEN = 0V C dB IQ Quiescent Current (VOUT = 1.5V) VEN = VTH(EN); IOUT = 10mA (VOUT = 1.5V) A -1.6 -300 50 -----0.4 -- VTH(EN) ILIMIT Enable Input Threshold Voltage Current Limit Voltage Increasing, Output Turns On, Logic High Voltage Decreasing, Output Turns Off, Logic Low V 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)/JA. 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 150mA. 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. Changes in output voltage due to heating effects are Preliminary and all contents are subject to change without prior notice. (c) Seaward Electronics, Inc., 2005. * www.seawardinc.com.cn * Page 3 150mA CMOS Low Noise LDO Voltage Regulator (Preliminary) Line Regulation (VOUT = 3.3V) (VIN = 4.3V to 5V, IOUT = 10mA) 3.6000 3.5000 VOUT (V) 3.4000 3.3000 3.2000 3.1000 3.0000 4.2 4.7 5.2 VIN (V) 5.7 VOUT (V) 3.6000 3.5000 3.4000 3.3000 3.2000 3.1000 3.0000 0 50 100 IOUT (mA) SE5508 Load Regulation (VOUT = 3.3V) (VIN = 5V, IOUT = 10mA to 150mA) 150 Output Voltage vs Temperature (VIN = 3.3V, IOUT = 10mA) 1.600 100 90 1.550 80 70 IQ vs IOUT (VOUT = 1.5V) (VIN = 3.3V, IOUT = 10mA to 150mA) Output Voltage(V) 1.500 IQ (uA) 60 50 40 30 20 10 1.450 1.400 20 30 40 50 60 70 80 90 100 110 120 0 0 20 40 60 80 100 120 140 160 Temperature(C ) IOUT (mA) P S RR (VOUT = 3.3V) (VIN = 5V, VP P = 1V) 70.0 65.0 60.0 Transient Response (VOUT = 3.3V) (IOUT = 1mA to 40mA) P S R R (dB) 55.0 50.0 45.0 40.0 35.0 30.0 100 1000 10000 100000 Frequency (Hz) C BY = 10uF C BY =22uF C BY = 0.1uF Preliminary and all contents are subject to change without prior notice. (c) Seaward Electronics, Inc., 2005. * www.seawardinc.com.cn * Page 4 150mA CMOS Low Noise LDO Voltage Regulator (Preliminary) Application Hints Like any low dropout regulator, SE5508 requires external capacitors to ensure stability. ensure performance. The external capacitors must be carefully selected to SE5508 Thermal Considerations It is important that the thermal limit of the package is not exceeded. protection. to ground. The SE5508 has built-in thermal When the thermal limit is exceeded, The power dissipation for a given the IC will enter protection, and VOUT will be pulled application can be calculated as following: The power dissipation (PD) is PD = IOUT * [VIN - VOUT] The thermal limit of the package is then limited to PD(MAX) = [TJ - TA]/JA where TJ is the junction temperature, TA is the ambient temperature, and JA is around 230C/W for SE5508. SE5508 is designed to enter thermal protection at 150C. For example, if TA is 25C then the maximum PD is limited to about 0.6W. In other words, if IOUT(MAX) = 150mA, then [VIN - VOUT] cannot exceed 3.6V. Input Capacitor An input capacitor of at least 1F is required. Ceramic or Tantalum can be used. The value can be increase without upper limit. Output Capacitor An output capacitor is required for stability. It must be placed no more than 1 cm away from the VOUT pin, and connected directly between VOUT and GND pins. The minimum value is 1F but may be increase without limit. Application Diagram Block Diagram Preliminary and all contents are subject to change without prior notice. (c) Seaward Electronics, Inc., 2005. * www.seawardinc.com.cn * Page 5 150mA CMOS Low Noise LDO Voltage Regulator (Preliminary) OUTLINE DRAWING SOT-23-5L K B H D SE5508 DIM A B C D E F H J K N A F E DIMENSIONS INCHES MM MIN MAX MIN MAX 0.110 0.059 0.036 0.014 0.0035 0.102 0.120 0.070 0.051 0.020 0.037 0.075 0.006 0.008 0.118 2.80 1.50 0.90 0.35 0.090 2.60 3.05 1.75 1.30 0.50 0.95 1.90 0.15 0.20 3.00 C J OUTLINE DRAWING SC70 (SOT353) Preliminary and all contents are subject to change without prior notice. (c) Seaward Electronics, Inc., 2005. * www.seawardinc.com.cn * Page 6 150mA CMOS Low Noise LDO Voltage Regulator (Preliminary) SE5508 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 - 12/5/2008 Preliminary and all contents are subject to change without prior notice. (c) Seaward Electronics, Inc., 2005. * www.seawardinc.com.cn * Page 7 |
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