MIC5239 Low Quiescent Current 500mA µCap LDO Regulator General Description Features The MIC5239 is a low quiescent current, µCap low-dropout • Ultra-low quiescent current (IQ = 23µA @IO = 100µA) regulator. With a maximum operating input voltage of 30V • Continuous 500mA output current and a quiescent current of 23µA, it is ideal for supplying • Wide input range: 2.3V to 30V keep-alive power in systems with high voltage batteries. • Low dropout voltage: 350mV @500mA Capable of 500mA output, the MIC5239 has a dropout • ±1.0% initial output accuracy voltage of only 350mV. It can provide high output current for applications such as USB. • Stable with ceramic or tantalum output capacitor As a µCap LDO, the MIC5239 is stable with either a • Logic compatible enable input ceramic or a tantalum output capacitor. It only requires a • Low output voltage error flag indicator 3.3µF output capacitor for stability. • Overcurrent protection The MIC5239 includes a logic compatible enable input and • Thermal shutdown an undervoltage error flag indicator. Other features of the • Reverse-leakage protection MIC5239 include thermal shutdown, current limit, overvolt- age shutdown, reverse-leakage protection, and reverse- • Reverse-battery protection battery protection. • High-power SOIC-8, MSOP-8 and SOT-223 packages Available in the thermally enhanced SOIC-8, MSOP-8 and Applications SOT-223, the MIC5239 comes in fixed 1.5V, 1.8V, 2.5V, 3.0V, 3.3V and 5.0V, and adjustable voltages. For other • USB power supply output voltages, contact Micrel. • Keep-alive supply in notebook and portable personal All support documentation can be found on Micrel’s web computers site at: www.micrel.com. • Logic supply from high voltage batteries • Automotive electronics • Battery-powered systems ___________________________________________________________________________________________________________ Typical Application 40 35 MIC5239 IOUT = 1mA V V 30 IOUT = 100µA IN IN OUT OUT 30V 3.0V/100µA 25 EN FLG IGND= 23µA 20 GND 15 IOUT = 10µA 10 Regulator with Low I and Low I 4 9 14 19 24 29 O Q Ground Current vs. Input Voltage MLF and MicroLeadFrame is a registered trademark of Amkor Technologies Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com December 2007 M9999-121007

Micrel MIC5239 Ordering Information Part Number Voltage(1) Junction Temp. Range Package Standard Pb-Free MIC5239-1.5BM MIC5239-1.5YM 1.5V –40°C to +125°C 8-pin SOIC MIC5239-1.5BMM MIC5239-1.5YMM 1.5V –40°C to +125°C 8-pin MSOP MIC5239-1.5BS MIC5239-1.5YS 1.5V –40°C to +125°C SOT-223 MIC5239-1.8BM MIC5239-1.8YM 1.8V –40°C to +125°C 8-pin SOIC MIC5239-1.8BMM MIC5239-1.8YMM 1.8V –40°C to +125°C 8-pin MSOP MIC5239-1.8BS MIC5239-1.8YS 1.8V –40°C to +125°C SOT-223 MIC5239-2.5BM MIC5239-2.5YM 2.5V –40°C to +125°C 8-pin SOIC MIC5239-2.5BMM MIC5239-2.5YMM 2.5V –40°C to +125°C 8-pin MSOP MIC5239-2.5BS MIC5239-2.5YS 2.5V –40°C to +125°C SOT-223 MIC5239-3.0BM MIC5239-3.0YM 3.0V –40°C to +125°C 8-pin SOIC MIC5239-3.0BMM MIC5239-3.0YMM 3.0V –40°C to +125°C 8-pin MSOP MIC5239-3.0BS MIC5239-3.0YS 3.0V –40°C to +125°C SOT-223 MIC5239-3.3BM MIC5239-3.3YM 3.3V –40°C to +125°C 8-pin SOIC MIC5239-3.3BMM MIC5239-3.3YMM 3.3V –40°C to +125°C 8-pin MSOP MIC5239-3.3BS MIC5239-3.3YS 3.3V –40°C to +125°C SOT-223 MIC5239-5.0BM MIC5239-5.0YM 5.0V –40°C to +125°C 8-pin SOIC MIC5239-5.0BMM MIC5239-5.0YMM 5.0V –40°C to +125°C 8-pin MSOP MIC5239-5.0BS MIC5239-5.0YS 5.0V –40°C to +125°C SOT-223 MIC5239BM MIC5239YM ADJ –40°C to +125°C 8-pin SOIC MIC5239BMM MIC5239YMM ADJ –40°C to +125°C 8-pin MSOP Note: 1. Other Voltages available. Contact Micrel for details. December 2007 2 M9999-121007

Micrel MIC5239 Pin Configuration SOIC-8 (M) SOT-223 (S) SOIC-8 (M) MSOP-8(MM) MSOP-8(MM) (Fixed) (Adj) Pin Description Pin Number Pin Number Pin Name Pin Function MSOP/SOIC SOT-223 2 (fixed) — FLG Error FLAG (Output): Open-collector output is active low when the output is out of regulation due to insufficient input voltage or excessive load. An external pull-up resistor is required. 2 (adj) — ADJ Adjustable Feedback Input: Connect to voltage divider network. 3 1 IN Power Supply Input. 4 3 OUT Regulated Output. 1 — EN Enable (input): Logic low = shutdown; logic high = enabled. 5–8 2 GND Ground: Pins 5, 6, 7, and 8 are internally connected in common via the leadframe. December 2007 3 M9999-121007

Micrel MIC5239 Absolute Maximum Ratings(1) Operating Ratings(2) Supply Voltage (V ) ......................................–20V to +32V Supply Voltage (V )..........................................2.3V to 30V IN IN Enable Input Voltage (V )............................–0.3V to +32V Enable Input Voltage (V )...................................0V to 30V EN EN Power Dissipation (P )(3)...........................Internally Limited Junction Temperature (T )........................–40°C to +125°C D J Junction Temperature (T )........................–40°C to +125°C Package Thermal Resistance J Storage Temperature (T ).........................–65°C to +150°C MSOP (θ )....................................................... 80°C/W S JA Lead Temperature (soldering, 5 sec.)........................260°C SOT-223 (θ )................................................... 50°C/W JA ESD Rating(4) SOT-23-3L...............................................................2kV MSOP-8L..............................................................1.5kV Electrical Characteristics(5) VIN = VOUT + 1V; VEN ≥ 2.0V; IOUT = 100µA; TJ = 25°C, bold values indicate –40°C ≤ TJ ≤ +125°C; unless noted. Symbol Parameter Condition Min Typ Max Units V Output Voltage Accuracy Variation from nominal V –1 1 % OUT OUT –2 2 % ∆V /V Line Regulation V = V +1V to 30V 0.06 0.5 % OUT OUT IN OUT ∆V /V Load Regulation I = 100µA to 500mA(6) 15 30 mV OUT OUT OUT ∆V Dropout Voltage(7) I = 100µA 50 mV OUT I = 150mA 350 mV OUT 260 400 mV I = 500mA 350 mV OUT I Ground Pin Current V ≥ 2.0V, I = 100µA 40 µA GND EN OUT 23 45 µA V ≥ 2.0V, I = 150mA 1.3 5 mA EN OUT V ≥ 2.0V, I = 500mA 8.5 15 mA EN OUT I Ground Pin Shutdown V ≤ 0.6V, V = 30V 0.1 1 µA GND(SHDN) EN IN I Short Circuit Current V = 0V 850 1200 mA SC OUT e Output Noise 10Hz to 100kHz, V = 3.0V, C = 3.3µF 160 µVrms n OUT L FLAG Output V Low Threshold % of V 94 % FLG OUT High Threshold % of V 95 % OUT V FLAG Output Low Voltage V = V – 0.12V , I = 200µA 150 mV OL IN OUT(nom) OUT OL I FLAG Output Leakage V = 30V 0.1 µA LEAK OH Enable Input V Input Low Voltage regulator off 0.6 V IL V Input High Voltage regulator on 2.0 V IH I Enable Input Current V = 0.6V, regulator off –1.0 1.0 µA IN EN 0.01 –2.0 2.0 µA V = 2.0V, regulator on 1.0 µA EN 0.15 2.0 µA V = 30V, regulator on 2.5 µA EN 0.5 5.0 µA December 2007 4 M9999-121007

Micrel MIC5239 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, and the regulator will go into thermal shutdown. The θJA of the MIC5239- x.xBMM (all versions) is 80°C/W, the MIC5239-x.xBM (all versions) is 63°C/W, and the MIC5239-x.xBS (all versions) is 50°C/W mounted on a PC board, see “Thermal Characteristics” for further details. 4. Devices are ESD sensitive. Handling precautions recommended. Human body model, 1.5kΩ in series with 100pF. 5. Specification for packaged product only. 6. Regulation is measured at constant junction temperature using pulse testing with a low duty-cycle. Changes in output voltage due to heating effects are covered by the specification for thermal regulation. 7. Dropout voltage is defined as the input to output differential at which the output voltage drops 2% below its nominal value measured at 1.0V differential. December 2007 5 M9999-121007

Micrel MIC5239 Typical Characteristics (V = 3V) OUT December 2007 6 M9999-121007

Micrel MIC5239 Typical Characteristics (continued) (V = 3V) OUT Input Current 120 )A100 m ( T 80 N E R R 60 U C T 40 U P V = 5V NI 20 REN = 30 LOAD 0 -20 -10 0 10 SUPPLY VOLTAGE (V) Functional Characteristics December 2007 7 M9999-121007

Micrel MIC5239 Functional Diagram Block Diagram — Fixed Voltages Block Diagram — Adjustable Voltages December 2007 8 M9999-121007

Micrel MIC5239 Application Information The MIC5239 provides all of the advantages of the MIC2950: wide input voltage range, and reversed- battery protection, with the added advantages of reduced quiescent current and smaller package. Additionally, when disabled, quiescent current is reduced to 0.1µA. Enable A low on the enable pin disables the part, forcing the quiescent current to less than 0.1µA. Thermal shutdown and the error flag are not functional while the device is disabled. The maximum enable bias current is 2µA for a 2.0V input. An open-collector pull-up resistor tied to the Figure 2. Output Capacitor ESR input voltage should be set low enough to maintain 2V on the enable input. Figure 1 shows an open-collector Error Detection Comparator Output output driving the enable pin through a 200kΩ pull-up The FLAG pin is an open-collector output which goes resistor tied to the input voltage. low when the output voltage drops 5% below it’s In order to avoid output oscillations, slow transitions from internally programmed level. It senses conditions such low-to-high should be avoided. as excessive load (current limit), low input voltage, and over temperature conditions. Once the part is disabled 200k V via the enable input, the error flag output is not valid. MIC5239 Overvoltage conditions are not reflected in the error flag V output. The error flag output is also not valid for input IN OUT V 5V voltages less than 2.3V. 200k EN FLG C The error output has a low voltage of 400mV at a current GND of 200µA. In order to minimize the drain on the source used for the pull-up, a value of 200kΩ to 1MΩ is suggested for the error flag pull-up. This will guarantee a maximum low voltage of 0.4V for a 30V pull-up potential. An unused error flag can be left unconnected. Figure 1. Remote Enable 4.75V Input Capacitor Output Voltage An input capacitor may be required when the device is 0V not near the source power supply or when supplied by a VALID ERROR battery. Small, surface mount ceramic capacitors can be Error FLAG NOT NOT used for bypassing. Larger values may be required if the Output VALID VALID source supply has high ripple. Output Capacitor Input 5V The MIC5239 has been designed to minimize the effect Voltage 1.3V 0V of the output capacitor ESR on the closed loop stability. As a result, ceramic or film capacitors can be used at the Figure 3. Error FLAG Output Timing output. Figure 2 displays a range of ESR values for a Thermal Shutdown 10µF capacitor. Virtually any 10µF capacitor with an ESR less than 3.4Ω is sufficient for stability over the The MIC5239 has integrated thermal protection. This entire input voltage range. Stability can also be feature is only for protection purposes. The device maintained throughout the specified load and line should never be intentionally operated near this conditions with 4.7µF film or ceramic capacitors. temperature as this may have detrimental effects on the life of the device. The thermal shutdown may become inactive while the enable input is transitioning from a high to a low. When disabling the device via the enable pin, transition from a high to low quickly. This will insure that the output remains disabled in the event of a thermal shutdown. December 2007 9 M9999-121007

Micrel MIC5239 Current Limit Figure 4 displays a method for reducing the steady state short-circuit current. The duration that the supply delivers current is set by the time required for the error flag output to discharge the 4.7µF capacitor tied to the enable pin. The off time is set by the 200kΩ resistor as it recharges the 4.7µF capacitor, enabling the regulator. This circuit reduces the short-circuit current from 800mA to 40mA while allowing for regulator restart once the short is removed. 1N4148 200k V ERR MIC5239 Figure 5. Thermal Resistance V 5VIN IN OUT VOUT Using the power MSOP-8 reduces the θJC dramatically 200k and allows the user to reduce θ . The total thermal CA EN FLG COUT resistance, θJA (junction-to-ambient thermal resistance) GND is the limiting factor in calculating the maximum power SHUTDOWN 4.7µF dissipation capability of the device. Typically, the power ENABLE MSOP-8 has a θJC of 80°C/W, this is significantly lower than the standard MSOP-8 which is typically 200°C/W. Figure 4. Remote Enable with Short-Circuit θCA is reduced because pins 5 through 8 can now be Current Foldback soldered directly to a ground plane which significantly reduces the case-to-sink thermal resistance and sink to Thermal Characteristics ambient thermal resistance. The MIC5239 is a high input voltage device, intended to Low-dropout linear regulators from Micrel are rated to a provide 500mA of continuous output current in two very maximum junction temperature of 125°C. It is important small profile packages. The power MSOP-8 allows the not to exceed this maximum junction temperature during device to dissipate about 50% more power than their operation of the device. To prevent this maximum standard equivalents. junction temperature from being exceeded, the appropriate ground plane heatsink must be used. Power MSOP-8 Thermal Characteristics One of the secrets of the MIC5239’s performance is its power MSOP-8 package featuring half the thermal resistance of a standard MSOP-8 package. Lower 2 thermal resistance means more output current or higher input voltage for a given package size. Lower thermal resistance is achieved by joining the four ground leads with the die attach paddle to create a single piece electrical and thermal conductor. This concept has been used by MOSFET manufacturers for years, proving very reliable and cost effective for the user. Thermal resistance consists of two main elements, θJC (junction-to-case thermal resistance) and θCA (case-to- ambient thermal resistance). See Figure 5. θJC is the Figure 6. Copper Area vs. Power-MSOP resistance from the die to the leads of the package. θCA Power Dissipation (∆TJA) is the resistance from the leads to the ambient air and it Figure 6 shows copper area versus power dissipation includes θCS (case-to-sink thermal resistance) and θSA with each trace corresponding to a different temperature (sink-to-ambient thermal resistance). rise above ambient. From these curves, the minimum area of copper necessary for the part to operate safely can be determined. The maximum allowable temperature rise must be calculated to determine operation along which curve. December 2007 10 M9999-121007

Micrel MIC5239 ∆T = T (max) – T (max) J A T (max) = 125°C J T (max) = maximum ambient operating A temperature For example, the maximum ambient temperature is 50°C, the ∆T is determined as follows: ∆T = 125°C – 50°C ∆T = 75°C Using Figure 6, the minimum amount of required copper can be determined based on the required power dissipation. Power dissipation in a linear regulator is calculated as follows: Figure 8. Copper Area vs. Power-SOIC PD = (VIN – VOUT) IOUT + VIN × IGND Power Dissipation (∆TJA) If we use a 3V output device and a 28V input at moderate output current of 25mA, then our power dissipation is as follows: P = (28V – 3V) × 25mA + 28V 250µA D 2 P = 625mW + 7mW D P = 632mW D From Figure 6, the minimum amount of copper required to operate this application at a ∆T of 75°C is 110mm2. Quick Method Determine the power dissipation requirements for the design along with the maximum ambient temperature at which the device will be operated. Refer to Figure 7, which shows safe operating curves for three different ambient temperatures: 25°C, 50°C and 85°C. From Figure 9. Copper Area vs. Power-SOIC these curves, the minimum amount of copper can be Power Dissipation (T ) A determined by knowing the maximum power dissipation The same method of determining the heatsink area used required. If the maximum ambient temperature is 50°C for the power MSOP-8 can be applied directly to the and the power dissipation is as above, 639mW, the power SOIC-8. The same two curves showing power curve in Figure 7 shows that the required area of copper dissipation versus copper area are reproduced for the is 110mm2. power SOIC-8 and they can be applied identically. The θ of this package is ideally 80°C/W, but it will vary JA Power SOIC-8 Thermal Characteristics depending upon the availability of copper ground plane to which it is attached. The power SOIC-8 package follows the same idea as the power MSOP-8 package, using four ground leads with the die attach paddle to create a single-piece electrical and thermal conductor, reducing thermal 2 resistance and increasing power dissipation capability. Quick Method Determine the power dissipation requirements for the design along with the maximum ambient temperature at which the device will be operated. Refer to Figure 9, which shows safe operating curves for three different ambient temperatures, 25°C, 50°C, and 85°C. From these curves, the minimum amount of copper can be determined by knowing the maximum power dissipation required. If the maximum ambient temperature is 50°C, and the power dissipation is 632mW, the curve in Figure Figure 7. Copper Area vs. Power-MSOP 9 shows that the required area of copper is less than Power Dissipation (T ) A 100mm2, when using the power SOIC-8. December 2007 11 M9999-121007

Micrel MIC5239 Adjustable Regulator Application The MIC5239YM can be adjusted from 1.24V to 20V by using two external resistors (Figure 10). The resistors set the output voltage based on the following equation: ⎛ R1⎞ V = V ⎜1+ ⎟ OUT REF ⎝ R2⎠ Where VREF = 1.23V. Feedback resistor R2 should be no larger than 300kΩ. Figure 10. Adjustable Voltage Application December 2007 12 M9999-121007

Micrel MIC5239 Package Information 8-Pin MSOP (MM) SOT-223 (S) December 2007 13 M9999-121007

Micrel MIC5239 8-Pin SOIC (M) 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. © 2003 Micrel, Incorporated. December 2007 14 M9999-121007

Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: M icrochip: MIC5239-1.8YS MIC5239YMM MIC5239-3.3YS MIC5239-5.0YS MIC5239-5.0YS TR MIC5239-3.3YM MIC5239- 3.3YMM MIC5239-5.0YM MIC5239-5.0YMM MIC5239YM MIC5239-2.5YS MIC5239-1.5YM MIC5239-3.0YS MIC5239-1.5YMM MIC5239-1.8YM MIC5239YM TR MIC5239-2.5YMM MIC5239-3.3YMM TR MIC5239-2.5YMM TR MIC5239-1.5YS TR MIC5239-1.5YM TR MIC5239-1.8YS TR MIC5239-2.5YM MIC5239-3.0YMM MIC5239-1.8YMM MIC5239YMM TR MIC5239-3.3YS TR MIC5239-3.3YM TR MIC5239-5.0YM TR MIC5239-3.0YS TR MIC5239- 2.5YS TR MIC5239-1.5YS MIC5239-3.0YMM TR MIC5239-2.5YM TR MIC5239-1.8YMM TR MIC5239-5.0YMM TR MIC5239-1.8YM TR MIC5239-1.5YMM TR MIC5239-3.0YMM-TR MIC5239-1.5YS-TR MIC5239-3.3YM-TR MIC5239- 5.0YS-TR MIC5239-2.5YM-TR MIC5239-1.8YMM-TR MIC5239-1.8YM-TR MIC5239-1.5YM-TR MIC5239-2.5YMM- TR MIC5239-2.5YS-TR MIC5239-3.3YMM-TR MIC5239-1.8YS-TR MIC5239-5.0YMM-TR MIC5239-3.0YS-TR MIC5239-3.3YS-TR MIC5239YM-TR MIC5239-1.5YMM-TR MIC5239YMM-TR MIC5239-5.0YM-TR