MIC5232 10mA Ultra-Low Quiescent Current µCap LDO Features General Description The MIC5232 is an ultra-low quiescent current, lowdropout linear regulator that is capable of operating from a single-cell lithium ion battery. Consuming only 1.8µA of quiescent current while operating, the MIC5232 is ideal for stand-by applications like powering real-time clocks or memory in battery operated electronics. Input voltage range: 2.7V to 7.0V Ultra-low Iq: Only 1.8µA operating current Stable with 0.47µF ceramic output capacitor Low dropout voltage of 100mV @ 10mA Reverse Battery Protection High output accuracy: – +2.0% initial accuracy – +3.0% over temperature Logic-Level Enable Input Miniature 6-pin 2mm x 2mm MLF package Lead-Free Thin SOT-23-5 Package Tight Load and Line Regulation The MIC5232 is capable of providing 10mA of output current and has low output noise, providing a small, efficient solution ideal for any keep-alive application. This includes reverse current protection, keeping reverse leakage (VOUT > VIN) down to 20nA. The MIC5232 is a µCap design, operating with very small ceramic output capacitors for stability, reduction of required board space and component cost. Applications The MIC5232 is available in fixed output voltages in the miniature 6-pin 2mm x 2mm MLF® package and thin SOT-23-5 package with an operating junction temperature range of -40°C to 125°C. Real-Time Clock Power Supply Stand-by Power Supply SRAM Memory Back-up Supply Cellular Telephones and Notebook Computers Typical Application MIC5232-1.2YD5 VIN 3.6V VIN 1µF VOUT 1.2V VOUT 0.47µF ceramic EN GND 3.0 2.7 Ground Pin Current vs. Input Voltage 2.4 2.1 1.8 1.5 1.2 0.9 1.5 Real-Time Clock Back-up Supply 0.6 0.3 VOUT = 1.2V IOUT = 100µA COUT = 0.47µF 0 2.5 3 3.5 4 4.5 5 5.5 6 6.5 7 INPUT VOLTAGE (V) MLF and MicroLeadFrame are registered trademarks of Amkor Technology, Inc. Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com June 2012 M9999-061812-C Micrel, Inc. MIC5232 Ordering Information Marking Code(1) Voltage(2) Junction Temperature Range Package Lead Finish MIC5232-1.2YD5 ZA12 1.2V –40°C to +125°C TSOT-23-5 Pb-Free MIC5232-1.8YD5 ZA18 1.8V –40°C to +125°C TSOT-23-5 Pb-Free MIC5232-2.5YD5 ZA25 2.5V –40°C to +125°C TSOT-23-5 Pb-Free MIC5232-2.8YD5 ZA28 2.8V –40°C to +125°C TSOT-23-5 Pb-Free MIC5232-3.3YD5 ZA33 3.3V –40°C to +125°C TSOT-23-5 Pb-Free MIC5232-1.2YML 12Z 1.2V –40°C to +125°C 6-Pin 2mm x 2mm MLF(3) Pb-Free MIC5232-1.8YML 18Z 1.8V –40°C to +125°C 6-Pin 2mm x 2mm MLF(3) Pb-Free –40°C to +125°C 6-Pin 2mm x 2mm MLF (3) Pb-Free (3) Pb-Free Pb-Free Part Number MIC5232-2.5YML 25Z 2.5V MIC5232-2.8YML 28Z 2.8V –40°C to +125°C 6-Pin 2mm x 2mm MLF MIC5232-3.3YML 33Z 3.3V –40°C to +125°C 6-Pin 2mm x 2mm MLF(3) Notes: 1. Overbar/Underbar symbol ( / __ ) may not be to scale. 2. Other voltages available. Contact Micrel Inc. for more details. 3. MLF is a GREEN RoHS compliant package. Lead finish is NiPdAu. Mold compound is Halogen Free. . June 2012 2 M9999-061812-C Micrel, Inc. MIC5232 Pin Configuration Pin Description Pin Number TSOT-23-5 Pin Number MLF Pin Name Pin Name 1 3 VIN Supply Input. 2 2 GND Ground. 3 1 EN Enable Input. Active High. High = on, Low = off. Do not leave floating. 4 5 NC Not Internally Connected. 5 4 VOUT - 6 NC - EP ePad Output (10mA output current). Not Internally Connected. Exposed pad connected-to-ground. Block Diagram June 2012 3 M9999-061812-C Micrel, Inc. MIC5232 Absolute Maximum Ratings(1) Operating Ratings(2) Supply Input Voltage (VIN) ................................0V to 8V Enable Input Voltage (VEN)...............................0V to 8V Power Dissipation (PD) .................... Internally Limited(3) Junction Temperature (TJ).................. –40°C to +125°C Storage Temperature (TS) .................. –65°C to +150°C Lead Temperature (soldering, 5 sec.) ................. 260°C ESD Rating(4) ......................................................... ±2kV Supply voltage (VIN) ...................................... 2.7V to 7V Enable Input voltage (VEN) ...............................0V to VIN Thermal Resistance TSOT-23-5 (θJA)......................................... 235°C/W MLF-6 (θJA) .................................................. 90°C/W Electrical Characteristics(5) VIN = VOUT + 1.0V, COUT = 0.47µF, IOUT = 100µA, TJ = 25°C, bold values indicate –40°C to +125°C, unless noted. Parameter Output Voltage Accuracy Conditions Variation from nominal VOUT Variation from nominal VOUT; -40C to +125C Min -2.0 -3.0 Typ Output Voltage Temp. Coefficient Line Regulation VIN = VOUT +1V to7V; 40 0.02 Load Regulation IOUT = 10µA to 10mA 0.2 Dropout Voltage(6) IOUT = 100µA IOUT = 10mA 60 100 IOUT = 10µA VEN < 0.18V VOUT = 0V VOUT = VIN + 1V f = 10Hz f = 1kHz COUT =0.47µF; 10Hz to 100kHz 1.8 0.1 70 0.02 55 35 400 Ground Pin Current Ground Pin Current in Shutdown Current Limit Reverse Current (VOUT > VIN) Ripple Rejection Output Voltage Noise Enable Input Enable Input Voltage Enable Input Current Turn-on Time(7) Logic Low (Regulator Shutdown) Logic High (Regulator Enabled) VIL < 0.18V (Regulator Shutdown) VIH > 1.4V (Regulator Enabled) COUT = 0.47µF Max +2.0 +3.0 0.25 1.0 1.5 300 % % mV mV 3 1.5 120 1 µA µA mA µA dB dB µVrms 0.18 V V nA nA ms 1.4 1 1 0.75 Units % % ppm/C %/V 1.5 Notes: 1. Exceeding the absolute maximum rating may damage the device. 2. The device is not guaranteed to function outside its operating rating. 3. The maximum allowable power dissipation of any TA (ambient temperature) is PD(max) = (TJ(max) – TA) / θJA. Exceeding the maximum allowable power dissipation will result in excessive die temperature. 4. Devices are ESD sensitive. Handling precautions recommended. 5. Specification for packaged product only. 6. Dropout voltage is defined as the input-to-output differential at which the output voltage drops 2% below its nominal VOUT. For outputs below 2.7V, dropout voltage is the input-to-output differential with the minimum input voltage 2.7V. 7. Turn-on time is measured from 10% of the positive edge of the enable signal to 90% of the rising edge of the output voltage of the regulator. June 2012 4 M9999-061812-C Micrel, Inc. MIC5232 Typical Characteristics 80 50 40 30 VOUT=3.3V VIN=VOUT+1V IOUT=100µA COUT=.47µF 20 10 0 0.01 100 80 60 40 20 VOUT = 3.3V COUT = 0.47µF 0.1 1 10 100 1000 10000 0 1 2 3 4 5 6 7 8 9 100 80 60 V OUT = 3.3V V IN = VOUT + 1V COUT = 0.47µF 0 20 40 60 80 100 1 0.8 100µA 0.6 0.4 10mA VOUT =1.2V VIN =VOUT +1V COUT =0.47µF 0.2 120 Ground Pin Current vs. Output Current 1 2 3 4 5 INPUT VOLTAGE (V) 6 6 4 VOUT = 3.3V VIN = VOUT + 1V COUT = 0.47µF 4 5 6 7 8 9 10 2.1 1.8 1.5 1.2 0.9 V OUT = 1.2V IOUT = 100µA COUT = 0.47µF 0.6 3.0 2.9 2.8 3.5 4.5 5.5 2.5 6.5 ENABLE THRESHOLD (V) CURRENT LIMIT (mA) 0.9 70 60 50 40 30 20 VOUT = 3.3 COUT = 0.47µF 10 0 0 20 40 60 80 TEMPERATURE (°C) June 2012 100 120 120 3.0 3.5 4.0 4.5 5.0 5.5 6.0 6.5 7.0 Enable-On Threshold vs. Temperature 80 -20 100 INPUT VOLTAGE (V) 16 -40 80 VOUT = 1.2V IOUT = 100uA COUT = 0.47µF 2 1.0 0 60 4 90 2 40 6 100 VOUT = 3.3V VIN = VOUT + 1V COUT =0.47µF IOUT =10mA 20 8 Current Limit 8 0 10 18 4 -20 12 20 6 VOUT = 3.3V VIN = VOUT +1V COUT = 0.47µF 2.7 0 2.5 Ground Pin Current vs. Temperature 10 120 3.1 INPUT VOLTAGE (V) 12 100 Ground Pin Current vs. Input Voltage 2.4 OUTPUT CURRENT (mA) 14 80 TEMPERATURE (°C) 0 3 60 14 0.3 0 40 3.2 -40 GROUND CURRENT (µA) GROUND CURRENT (µA) 8 20 3.3 7 2.7 10 0 Output Voltage vs. Temperature Ground Pin Current vs. Input Voltage 12 2 -20 2.6 3 1 10 2.5 0 14 0 VOUT =3.3V IOUT =100µA COUT =0.47µF 20 3.4 TEMPERATURE (°C) 2 30 3.5 0 0 40 TEMPERATURE (°C) OUTPUT VOLTAGE (V) OUTPUT VOLTAGE (V) 120 -20 50 -40 10 1.2 140 -40 60 Output Voltage vs. Input Voltage 1.4 160 20 70 OUTPUT CURRENT (mA) Dropout Voltage vs. Temperature 40 80 0 0 FREQUENCY (kHz) DROPOUT VOLTAGE (mV) DROPOUT VOLTAGE (mV) DROPOUT VOLTAGE (mV) PSRR (dB) 60 GROUND CURRENT (µA) 90 120 70 GROUND CURRENT (µA) Dropout Voltage vs. Temperature Dropout Voltage vs. Output Current Ripple Rejection 0.8 0.7 0.6 0.5 0.4 0.3 VOUT = 3.3V VIN = VOUT + 1V COUT = 0.47µF 0.2 0.1 0.0 2.5 3 3.5 4 4.5 5 5.5 INPUT VOLTAGE (V) 5 6 6.5 7 -40 -20 0 20 40 60 80 100 120 TEMPERATURE (°C) M9999-061812-C Micrel, Inc. MIC5232 Typical Characteristics (continued) Short Circuit Current vs. Temperature Turn-On Time 1400 (VOUT > VIN ) 100 80 1000 800 600 400 VOUT = 1.2V VIN = 2.7V COUT = 1uF IOUT = 100uA 200 0 90 70 60 50 40 30 20 VOUT = 0V VIN = 4.3V COUT = 0.47µF 10 -20 0 20 40 60 80 100 Temperature (°C) 1E+02 120 80 70 60 50 40 30 20 VIN=2.7V COUT=0.47µF 10 0 0 -40 REVERSE CURRENT (nA) (V OUT CURRENT) SHORT CIRCUIT CURRENT (mA) 1200 Time (µs) Reverse Leakage Current 90 -40 10 60 TEMPERATURE (°C) 110 2.5 3.0 3.5 4.0 4.5 5.0 5.5 OUTPUT VOLTAGE (V) Output Noise Spectral Density 1E+01 1E-00 1E-01 VOUT = 1.2V VIN = 4.3V ROUT COUT = 0.47µF 1E-02 0.1 100 FREQUENCY (kHz) June 2012 6 M9999-061812-C Micrel, Inc. MIC5232 Functional Characteristics June 2012 7 M9999-061812-C Micrel, Inc. MIC5232 Because this device is CMOS and the ground current is typically <15μA over the load range, the power dissipation contributed by the ground current is < 1% and can be ignored for this calculation. PD = (4.3V – 3.3V) • 10mA PD = 0.01W To determine the maximum ambient operating temperature of the package, use the junction-toambient thermal resistance of the device and the following basic equation: Application Information Input Capacitor If there is more than 20cm of wire between IN and the ac filter capacitor or if supplied from a battery, a 1µF (or larger) capacitor should be placed from the IN (supply input) to GND (ground). Output Capacitors The MIC5232 requires an output capacitor for stability. A 0.47µF, or larger capacitor, is recommended between VOUT (output) and GND to improve the regulator’s transient response. A 0.47µF capacitor can be used to reduce overshoot recovery time at the expense of overshoot amplitude. The ESR (effective series resistance) of this capacitor has no effect on regulator stability, but low-ESR capacitors improve the high frequency transient response. The value of this capacitor may be increased without limit, but values larger than 10µF tend to increase the settling time after a step change in input voltage or output current. PD(max) JA TJ(max) = 125C, the max. junction temperature of the die, θJA thermal resistance = 90C/W for the 2mm x 2mm MLF® package. Substituting PD for PD(max), and solving for the ambient operating temperature, will give the maximum operating conditions for the regulator circuit. The junction-to-ambient thermal resistance for the minimum footprint is 90C/W. The maximum power dissipation must not be exceeded for proper operation. For example, when operating the MIC5232-3.3BML at an input voltage of 4.3V and 10mA load with a minimum footprint layout, the maximum ambient operating temperature TA can be determined as follows: Minimum Load Current The MIC5232 does not require a minimum load for proper operation. This allows the device to operate in applications where very light output currents are required for keep-alive purposes. This is important for powering SRAM or Flash memory in low-power modes for handheld devices. Safe Operating Conditions The MIC5232 incorporates current limit in the design. There is also reverse circuit protection circuitry built into the device. The maximum junction temperature for the device is +125C, and it is important that this is not exceeded for any length of time. 0.01W 125C T A 90C / W TA = 124°C Therefore, a 3.3V application at 10mA of output current can accept an ambient operating temperature of 124°C in a 2mm x 2mm MLF®-6 package. For a full discussion of heat sinking and thermal effects on voltage regulators, refer to the “Regulator Thermals” section of Micrel’s “Designing with Low-Dropout Voltage Regulators” handbook. This information can be found on Micrel's website at: http://www.micrel.com/_PDF/other/LDOBk_ds.pdf Thermal Considerations The MIC5232 is designed to provide 10mA of continuous current in a very small package. Maximum ambient operating temperature can be calculated based on the output current and the voltage drop across the part. Given that the input voltage is 4.3V, the output voltage is 3.3V and the output current = 10mA. The actual power dissipation of the regulator circuit can be determined using the equation: PD = (VIN – VOUT) IOUT + VIN IGND June 2012 T J (max) T A 8 M9999-061812-C Micrel, Inc. MIC5232 Package Information 5-Pin TSOT-23 (D5) ® 6-Pin 2mm x 2mm MLF (ML) June 2012 9 M9999-061812-C Micrel, Inc. MIC5232 MICREL, INC. 2180 FORTUNE DRIVE SAN JOSE, CA 95131 USA TEL +1 (408) 944-0800 FAX +1 (408) 474-1000 WEB http:/www.micrel.com The information furnished by Micrel in this data sheet is believed to be accurate and reliable. However, no responsibility is assumed by Micrel for its use. Micrel reserves the right to change circuitry and specifications at any time without notification to the customer. Micrel Products are not designed or authorized for use as components in life support appliances, devices or systems where malfunction of a product can reasonably be expected to result in personal injury. Life support devices or systems are devices or systems that (a) are intended for surgical implant into the body or (b) support or sustain life, and whose failure to perform can be reasonably expected to result in a significant injury to the user. A Purchaser’s use or sale of Micrel Products for use in life support appliances, devices or systems is a Purchaser’s own risk and Purchaser agrees to fully indemnify Micrel for any damages resulting from such use or sale. © 2005 Micrel, Inc. June 2012 10 M9999-061812-C