MIC5295 Low Quiescent Current, 150mA LDO Regulator General Description Features The MIC5295 is a 150mA highly accurate, low dropout regulator with high input voltage and low ground current. This combination of high voltage and low ground current makes the MIC5295 ideal for USB and portable electronics applications, using 1-cell, 2-cell or 3-cell Li-Ion battery inputs. A µCap LDO design, the MIC5295 is stable with either a ceramic or tantalum output capacitor. It only requires a 2.2µF capacitor for stability. Features of the MIC5295 includes enable input, thermal shutdown, current limit, reverse battery protection, and reverse leakage protection. Available in fixed and adjustable output voltage versions, the MIC5295 is offered in the TO-252-5 (D-Pak) package with a junction temperature range of –40°C to +125°C. • • • • • • • • • • • Wide input voltage range: 2.3V to 24V Ultra low ground current: 18µA Low dropout voltage: 300mV at 150mA High initial output accuracy: ±1.0% Stable with ceramic or tantalum capacitors Excellent line and load regulation specifications Reverse battery protection Reverse leakage protection Thermal shutdown and current limit protection PowerTO-252-5 (D-Pak)package Adjustable output from 1.24V-20V Applications • • • • • • USB power supply Cellular phones Keep-alive supply in notebook and portable computers Logic supply for high-voltage batteries Automotive electronics Battery powered systems Typical Application Ground Current v s. Input Voltage 100 GROUND CURRENT (µA) 90 80 70 60 10mA 50 40 100µA 30 20 10 0 4 Low Current Adjustable Regulator Application 8 12 16 20 INPUT VOLT AGE (V) 24 Ground Current vs. Input Voltage IttyBitty is a registered trademark of Micrel, 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 November 2009 M9999-110209-A Micrel, Inc. MIC5295 Ordering Information Part Number Marking Code Voltage Junction Temp. Range Package MIC5295-3.0YD 5295-30Y 3.0V –40° to +125°C 5-Pin TO-252 MIC5295-3.3YD 5295-33Y 3.3V –40° to +125°C 5-Pin TO-252 MIC5295-5.0YD 5295-50Y 5.0V –40° to +125°C 5-Pin TO-252 5295YD Adj –40° to +125°C 5-Pin TO-252 MIC5295YD Pin Configuration 5-Pin TO-252 Pin Description Pin Number Pin Name Pin Function 1 EN Enable (Input): Logic low = shutdown; logic high = enable. Do not leave floating. 2 VIN Supply Input. 3 GND Ground. 4 VOUT Regulator Output. 5 NC(fixed) No Connect. ADJ(adj) Adjust (Input): Feedback input. Connect to resistive Voltage-divider network. November 2009 2 M9999-110209-A Micrel, Inc. MIC5295 Absolute Maximum Ratings(1) Operating Ratings(2) Input Supply Voltage ........................................ –20V to 38V Enable Input Voltage....................................... –0.3V to 38V Power Dissipation .....................................Internally Limited Junction Temperature ...............................–40°C to +125°C Storage Temperature ................................–65°C to +150°C ESD Rating(3) ................................................. ESD Sensitive Input Supply Voltage ......................................... 2.3V to 24V Enable Input Voltage............................................ 0V to 24V Junction Thermal....................................... –40°C to +125°C Package Thermal Resistance TO-252-5 (θJA) ...................................................50°C/W Electrical Characteristics(4) VIN = VOUT + 1V; IOUT = 100µA; CIN =1.0μF, COUT = 2.2μA; TJ = 25°C, bold values indicate –40°C<TJ<+125°C; unless otherwise specified. Parameter Condition Min Output Voltage Accuracy Variation from nominal VOUT –1.0 –2.0 Typ Max Units +1.0 +2.0 % % Line Regulation VIN = VOUT + 1V to 24V 0.04 Load Regulation Load = 100µA to 150mA 0.25 Dropout Voltage IOUT = 100µA 45 IOUT = 50mA 220 400 mV IOUT = 100mA 260 450 mV 300 500 mV IOUT = 150mA Reference Voltage % 1 mV 1.24 -1.0 % V +1.0 % µA µA mA mA mA IOUT = 100µA 18 IOUT = 50mA IOUT = 100mA IOUT = 150mA 0.35 1 2 30 35 0.7 2 4 VEN = 0V; VIN = 24V 0.1 1 µA Current Limit VOUT = 0V 350 500 mA Ripple Rejection f =1kHz 50 dB Output Voltage Noise 10Hz to 100kHz 47 µVRMS Output Leakage, Reverse Polarity Input Load = 500Ω; VIN = –15V; VEN =0.4V –0.1 µA Ground Current Ground Current in Shutdown Enable Input Enable turn on time 1.2 Input Low Voltage Regulator OFF Input High Voltage Regulator ON 2.0 Enable Input Current VEN = 0.6V; Regulator OFF VEN = 2.0V; Regulator ON VEN = 24V; Regulator ON –1.0 10 ms 0.4 V V 0.01 0.1 0.5 1.0 1.0 2.5 µA µA µA Notes: 1. Exceeding the absolute maximum rating may damage the device. 2. The device is not guaranteed to function outside its operating rating. 3. Devices are ESD sensitive. Handling precautions recommended. Human body model, 1.5kΩ in series with 100pF. 4. Specification for packaged product only. November 2009 3 M9999-110209-A Micrel, Inc. MIC5295 Typical Characteristics Dropout Voltage v s. Output Current PSRR -80 DRO POUT VOLTAG E (mV) VIN = 10V VOUT = 2.5V COUT = 2.2µF -90 -70 150mA -50 -40 -30 -20 100µA -10 450 300 400 250 200 150 100 50 VOUT = 2.5V COUT = 2.2µF 200 25 50 75 100 125 OUT PUT CURRENT (mA) 150 -40 -20 2.5 10mA 50 40 100µA 30 20 VOUT = 1.36V COUT = 2.2µF 10 0.0 3.3 3.8 4.3 4.8 5.3 INPUT VOLT AGE (V) 5.8 100mA 1.0 50mA 0.5 0.0 2.3 2.8 3.3 3.8 4.3 4.8 5.3 INPUT VO LT AGE (V) 5.8 4 100 2.50 VOUT = 3V COUT = 2.2µF 150mA VIN = 12V GROUND CURRENT (mA) 1.75 1.50 10mA VIN = 4V 1.25 50 1.00 40 100µA 30 0.75 0.50 20 VIN = 24V 0.25 10 0.00 0 4 8 12 16 20 INPUT VOLT AGE (V) 2.5 25 50 75 100 125 OUT PUT CURRENT (mA) Output Voltage v s. Input Voltage 1.0 50mA 0.5 150 -40 -20 0 20 40 60 80 T EM PERAT URE (°C) 100 120 MIC5295 - Output Noise Spectral Density 10 500 COUT = 2.2µF 100mA 1.5 Current limit v s. Input Voltage 3.2 VOUT = 3V COUT = 2.2µF 2.0 0.0 0 24 24 3.0 2.00 70 12 16 20 INPUT VOLT AGE (V) Ground Current v s. Temperature VOUT = 3V COUT = 2.2µF 2.25 80 60 8 Ground Current v s. Output Current Ground Current v s. Input Voltage 90 150mA 1.5 0 2.8 100 120 VOUT = 3V COUT = 2.2µF 2.0 GROUND CURRENT (mA) 50mA 0.5 60 0 20 40 60 80 T EM PERAT URE (°C) Ground Current v s. Input Voltage 70 G RO UND CURRENT (µA) 100mA 1.0 2.3 VOUT = 2.5V COUT = 2.2µF 50 80 2.0 VOUT = 1.36V COUT = 2.2µF 100mA 100 90 150mA 1.5 50mA 150 Ground Current v s. Input Voltage 2.5 GROUND CURRENT (mA) 250 0 0 Ground Current v s. Input Voltage GROUND CURRENT (µA) 300 0 0 10 100 1K 10K 100K 1.E+0 1M 10M 1.E+0 1.E+0 1.E+0 1.E+0 1.E+0 1.E+0 1 2 3 4 5 6 7 FREQ UENCY (Hz) 150mA 350 GROUND CURRENT (mA) dB -60 350 DROPOUT VO LTAGE (mV) -100 Dropout Voltage v s. Temperature 100µA 3.0 75mA 2.9 150mA 2.8 1 400 NOISE µV/√Hz CURRENT LIM IT (mA) O UTPUT VOLTAG E (V) 450 3.1 350 300 0.01 250 200 0 5 10 15 20 INPUT VO LT AG E (V) November 2009 25 0.1 0 5 10 15 20 25 30 INPUT VO LT AGE (V) 4 35 40 VIN = 4.5V VOUT = 3V COUT = 2.2µF 0.001 10 100 1K 10K 100K 1M 1.E+01 1.E+02 1.E+03 1.E+04 1.E+05 1.E+06 FREQUENCY (Hz) M9999-110209-A Micrel, Inc. MIC5295 Typical Characteristics (continued) Rev erse Current (VIN Grounded) 70 60 60 50 50 REVERSE CURRENT (µA) REVERSE CURRENT (µA) Rev erse Current (Open Input) 125°C 40 -40°C 30 20 10 25°C 0 -40°C 125°C 40 30 20 25°C 10 0 0 5 10 15 EXT ERNAL VOLT AGE (V) November 2009 20 0 5 10 15 EXT ERNAL VOLT AGE (V) 5 20 M9999-110209-A Micrel, Inc. MIC5295 Functional Characteristics November 2009 6 M9999-110209-A Micrel, Inc. MIC5295 Functional Diagram Block Diagram – Fixed Output Voltage Block Diagram – Adjustable Output Voltage November 2009 7 M9999-110209-A Micrel, Inc. MIC5295 part. For example, given that the input voltage of 3.3V the output voltage is 2.3V and the output current = 150mA. The actual power dissipation of the regulator circuit can be determined using the equation: PD = (VIN – VOUT)IOUT + VIN × IGND Due to the potential for input voltages up to 24V, ground current must be taken into consideration. PD(MAX) = (3.3 – 2.3V)150mA + 3.3x 1.2mA PD(MAX) = 0.154W The junction-to-ambient thermal resistance for the MIC5295, D-Pak is 50°C/W.To determine the maximum ambient operating temperature of the package, use the junction-to-ambient thermal resistance of the device and the following basic equation: Application Information Enable/Shutdown The MIC5295 comes with an active-high enable pin that allows the regulator to be disabled. Forcing the enable pin low disables the regulator and sends it into a “zero” off-mode-current state. In this state, current consumed by the regulator goes nearly to zero. Forcing the enable pin high enables the output voltage. Do not leave this pin floating as the output will be in indeterminate state. Input Capacitor The MIC5295 has high input voltage capability up to 24V. The input capacitor must be rated to sustain voltages that may be used on the input. An input capacitor may be required when the device is not near the source power supply or when supplied by a battery. Small, surface mount, ceramic capacitors can be used for bypassing. Larger values may be required if the source supply has high ripple. ⎛ TJ(MAX) − TA PD(MAX) = ⎜⎜ θ JA ⎝ ⎞ ⎟ ⎟ ⎠ TJ(MAX) is the maximum junction temperature of the die, 125°C, the maximum ambient temperature can be calculated to be 117.3°C as shown below: Output Capacitor The MIC5295 requires an output capacitor for stability. The design requires 2.2µF or greater on the output to maintain stability. The design is optimized for use with low-ESR ceramic chip capacitors. High ESR capacitors may cause high frequency oscillation. The maximum recommended ESR is 3Ω. The output capacitor can be increased without limit. Larger valued capacitors help to improve transient response. X7R/X5R dielectric-type ceramic capacitors are recommended because of their temperature performance. X7R-type capacitors change capacitance by 15% over their operating temperature range and are the most stable type of ceramic capacitors. Z5U and Y5V dielectric capacitors change value by as much as 50% and 60% respectively over their operating temperature ranges. To use a ceramic chip capacitor with Y5V dielectric, the value must be much higher than a X7R ceramic capacitor to ensure the same minimum capacitance over the equivalent operating temperature range. ⎛ 125°C − TA ⎞ 0.154W = ⎜ ⎟ ⎝ 50°C/W ⎠ TA = 117.3°C Adjustable Regulator Application The MIC5295YD can be adjusted from 1.24V to 20V by using two external resistors (Figure 1). The resistors set the output voltage based on the following equation: ⎛ ⎛R VOUT = VREF ⎜1 + ⎜⎜ 1 ⎜ ⎝ ⎝ R2 ⎞⎞ ⎟⎟ ⎟ ⎟ ⎠⎠ Where VREF = 1.24V. Feedback resistor R2 should be no larger than 300kΩ. No-Load Stability The MIC5295 will remain stable with no load unlike many other voltage regulators. This is especially important in CMOS RAM keep-alive applications. Figure 1. Adjustable Voltage Application Thermal Considerations The MIC5295 is designed to provide 150mA of continuous current in a small package. Maximum ambient operating temperature can be calculated based on the output current and the voltage drop across the November 2009 8 M9999-110209-A Micrel, Inc. MIC5295 Evaluation Board Schematic Bill of Materials Item Part Number Manufacturer Description C1 UMK325BJ105KM-T Taiyo Yuden(1) Capacitor, 1µF, 50V, X5R, Size 1210 1 C2 TMK212BJ225KG-T Taiyo Yuden Capacitor, 2.2µF, 25V, X5R, Size 0805 1 R1 CRCW06033003FKEYE3 R2 CRCW06031003FKEYE2 U1 MIC5295YD (2) Vishay Dale Vishay Dale Micrel, Inc. (3) Qty. Resistor, 300k, 1%. 1/16W, Size 0603 1 Resistor, 100k, 1%. 1/16W, Size 0603 1 Low Quiescent Current, 150mA LDO Regulator 1 Notes: 1. Murata: www.t-yuden.com 2. Vishay: www.vishay.com. 3. Micrel, Inc.: www.micrel.com. November 2009 9 M9999-110209-A Micrel, Inc. MIC5295 PCB Layout Recommendations Top Layer Bottom Layer November 2009 10 M9999-110209-A Micrel, Inc. MIC5295 Package Information 5-Pin TO-252 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. © 2009 Micrel, Incorporated. November 2009 11 M9999-110209-A