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Technical content

Features

 Typical 150mV Dropout Voltage at 500mA.  Output Voltages：0.8V to 3.9V（0.1V Step）  Excellent Line and Load Regulation.  High Accuracy Output Voltage of 2%.  Ultra-Low Ground Current at 150μA (Typ.)  Thermal and Over-Current Protection.  Short Circuit Protection  Standard SOT-223 and TO-252 Package.

Applications

 USB removable devices  MPEG4 devices  Wireless LAN’s  Hand-Held Instrumentation.  Portable DVD players  Digital camera

Preliminary and all contents are subject to change without prior notice. © Seaward Electronics, Inc., • www.seawardinc.com • Page 2 9/4/2012 SE5120 1.5A CMOS Ultra LDO Voltage Regulator Pin Configuration Pin Description Pin Name Pin Function Description GND Groung OUT Output Voltage IN Input Voltage Functional Block Diagram Over- C urrent Short TemperatureProtection Protection ProtectionC ircuit Over- R eference Voltage Vin GND Vout

Preliminary and all contents are subject to change without prior notice. © Seaward Electronics, Inc., • www.seawardinc.com • Page 3 9/4/2012 SE5120 1.5A CMOS Ultra LDO Voltage Regulator

Ordering Information

Device Marking Information Package Remarks SE5120STxx-LF SE5120STXX-YYWW-LF SOT-223 YYWW means Production batch XX denotes voltage options SE5120SGxx-LF SE5120SGXX-YYWW-LF SE5120JTxx-LF SE5120JTXX-YYWW-LF TO-252 SE5120JGxx-LF SE5120JGXX-YYWW-LF SE5120STxx-HF SE5120STXX-YYWW-HF SOT-223 YYWW means Production batch XX denotes voltage options SE5120SGxx-HF SE5120SGXX-YYWW-HF SE5120JTxx-HF SE5120JTXX-YYWW-HF TO-252 SE5120JGxx-HF SE5120JGXX-YYWW-HF Absolute Maximum Ratings Parameter Symbol Value Units Input Voltage VIN 6 V Output Voltage Range VOUT -0.3 to VIN V Power Dissipation PD Internally Limited (3) Output Short Circuit Duration Infinite Thermal Resistance, Junction-to-Ambient ΘJA 155(SOT-223) °C/W 90(TO-252) Lead Temperature (Soldering, 5 sec.) 260 °C Junction Temperature Range TJ 0 to +150 °C Storage Temperature Range TS -40 to +150 °C

Preliminary and all contents are subject to change without prior notice. © Seaward Electronics, Inc., • www.seawardinc.com • Page 4 9/4/2012 SE5120 1.5A CMOS Ultra LDO Voltage Regulator Recommended Operating Conditions Parameter Symbol Value Units Supply Input Voltage Range VIN 5 V Junction Temperature Range TJ 0 to +125 °C

Electrical Characteristics

（VIN = 5V; CIN = 10μF; COUT = 10μF; IOUT = 10mA; TJ = 25°C; unless otherwise noted） Symbol Parameter Test Conditions Min Typ Max Unit VOUT Output Voltage Accuracy SE5120XX12 SE5120XX15 SE5120XX18 SE5120XX25 SE5120XX33 1.176 1.47 1.764 2.45 3.234 1.2 1.5 1.8 2.5 3.3 1.224 1.53 1.836 2.55 3.366 V ΔVOUT/VOUT Line Regulation VIN = (VOUT + 0.7)V to 5.5V -- 0.1 -- %/V ΔVOUT/VOUT Load Regulation (5) VIN = (VOUT + 0.7)V IOUT = 10mA to 1500mA -- 2 -- % ΔVOUT/ΔT Output Voltage Temperature Coefficient Note 4 -- 0.1 -- mV/° C VIN – VOUT Dropout Voltage (6) IOUT = 150mA -- 40 -- mV IOUT = 500mA -- 150 -- IOUT = 1000mA -- 300 -- TPROTECTION Thermal Protection Thermal Protection Temperature -- 150 -- °C Protection Hysterisys -- 30 -- IQ Quiescent Current IOUT = 0mA -- 150 -- μA ILIMIT Current Limit -- 2.5 -- A Ishort Short Circuit Current Vin=Vout+1V; Vout< 0.4V -- 0.55 -- A 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 T A (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.

Preliminary and all contents are subject to change without prior notice. © Seaward Electronics, Inc., • www.seawardinc.com • Page 5 9/4/2012 SE5120 1.5A CMOS Ultra LDO Voltage Regulator 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 1 200mA. 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 out put voltage drops 2% below its nominal value measured at 1V differential.

Preliminary and all contents are subject to change without prior notice. © Seaward Electronics, Inc., • www.seawardinc.com • Page 6 9/4/2012 SE5120 1.5A CMOS Ultra LDO Voltage Regulator Typical Performance Characteristics Reference Voltage vs. Temperature 0.7 0.72 0.74 0.76 0.78 0.8 0.82 0.84 30 40 50 60 70 80 90 100 110 120 130 140 150 T (℃) Reference Voltage （V） Output Voltage vs. Load Current 3.200 3.220 3.240 3.260 3.280 3.300 3.320 3.340 0 0. 1 1. Load Current (A) Output Voltage (V) Output Voltage vs. Input Voltage 3.1 3.15 3.2 3.25 3.3 3.35 3.4 Input Voltage (V) Output Voltage (V)

Preliminary and all contents are subject to change without prior notice. © Seaward Electronics, Inc., • www.seawardinc.com • Page 7 9/4/2012 SE5120 1.5A CMOS Ultra LDO Voltage Regulator Applications Information Application Hints Like any low dropout regulator, SE51 20 requires external capacitors to ensure stability. The external capacitors must be carefully selected to ensure performance. Input Capacitor An input capacitor of at least 10 μF 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 V OUT and GND pins. The minimum value is 10 μF but may be increase without limit. Thermal Considerations It is important that the thermal limit of the package is not exceeded. The SE5 120 has built -in thermal protection. When the thermal limit is exceeded, the IC will enter protection, and V OUT will be pulled to ground. The power dissipation for a given application can be calculated as following: The power dissipation (P D) is PD = IOUT * [VIN – VOUT] The thermal limit of the package is then limited to P D(MAX) = [T J – TA]/ΘJA where T J is the junction temperature, TA is the ambient temperature, and Θ JA is around 155°C/W（SOT-223） for SE5120. SE5 120 is designed to enter thermal protection at 170°C. For example, if T A is 25°C then the maximum P D is limited to about 0. 94W. In other words, if I OUT(MAX) = 1200mA, then [VIN – VOUT] cannot exceed 780mV.

Preliminary and all contents are subject to change without prior notice. © Seaward Electronics, Inc., • www.seawardinc.com • Page 8 9/4/2012 SE5120 1.5A CMOS Ultra LDO Voltage Regulator Outline Drawing For SOT-223 Outline Drawing For TO-252

Preliminary and all contents are subject to change without prior notice. © Seaward Electronics, Inc., • www.seawardinc.com • Page 9 9/4/2012 SE5120 1.5A CMOS Ultra LDO Voltage Regulator 联系方式： 北京思旺电子技术有限公司–中国总部 地址：中国北京市海淀区信息路 22 号上地科技综合楼 B 座二层 邮编：100085 电话:010-82895700/1/5 传真:010-82895706 Seaward Electronics Corporation – 台湾办事处 2F, #181, Sec. 3, Minquan East Rd, Taipei, Taiwan R.O.C 电话: 886-2-2712-0307 传真: 886-2-2712-0191 Seaward Electronics Incorporated – 北美办事处 1512 Centre Pointe Dr. Milpitas, CA95035, USA 电话: 1-408-821-6600