MIC5325 Low VIN/VOUT 400mA ULDO™ with Ultra-Low IQ General Description Features The MIC5325 is a high-performance, µCap, low-dropout regulator, offering ultra-low operating current while maintaining very fast transient response. The MIC5325 can source up to 400mA of output current and allows a low input supply voltage source to increase system efficiency. Ideal for battery operated applications; the MIC5325 offers high accuracy, extremely low dropout voltage, and low ground current at all load conditions. The MIC5325 can also be put into a zero-off-mode current state, drawing virtually no current when disabled. The MIC5325 is available in fixed-output voltages in the 6-pin 2mm x 2mm Thin MLF® leadless package. Data sheets and support documentation can be found on Micrel’s web site at www.micrel.com. • • • • • • • • • • • Wide-input voltage range: 1.7V to 5.5V Stable with 1µF ceramic output capacitor Ultra-low-dropout voltage ULDO™ 110mV @ 400mA ±2% voltage accuracy over temperature Bias supply voltage range: 2.5V to 5.5V Adjustable output voltage range: 0.8V to 2.0V Ultra-low ground current 35µA typical 400mA maximum output current per LDO Very fast transient response Thermal-shutdown and current-limit protection Tiny 6-pin 2mm x 2mm Thin MLF® package Applications • • • • Low-power handheld devices Portable electronics GPS receivers Post regulator ___________________________________________________________________________________________________________ Typical Application ULDO is a trademark of Micrel, Inc 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 August 2010 M9999-080510-B Micrel, Inc. MIC5325 Ordering Information Part Number Marking Code Output Voltage Temperature Range Package MIC5325-1.2YMT QG4 1.2V –40°C to +125°C 6-Pin 2mm x 2mm Thin MLF® Pb-Free ® Pb-Free Lead Finish MIC5325-1.5YMT QGF 1.5V –40°C to +125°C 6-Pin 2mm x 2mm Thin MLF MIC5325-1.8YMT QGG 1.8V –40°C to +125°C 6-Pin 2mm x 2mm Thin MLF® Pb-Free –40°C to +125°C ® Pb-Free MIC5325-3.6YMT QGV 3.6V 6-Pin 2mm x 2mm Thin MLF Notes: 1. Other voltages available. Contact Micrel for details. 2. Contact Marketing for ADJ version availability. 3. ▲ = Pin 1 identifier. Pin Configuration VBIAS 1 6 EN GND 2 5 BYP/ADJ IN 3 4 OUT 6-Pin 2mm x 2mm Thin MLF® (MT) Pin Description Pin Number Pin Name 1 VBIAS 2 GND 3 IN 4 OUT 5 BYP/ADJ 6 EN August 2010 Pin Function Bias Input Voltage. Ground Power Input for LDO. Output of regulator. Bypass: Connect a capacitor to ground to reduce noise and reduce ripple rejection. Adjust: Feedback input from external resistor divider. Enable Input: Active High Input. Logic High = On; Logic Low = Off. Do not leave floating. 2 M9999-080510-B Micrel, Inc. MIC5325 Absolute Maximum Ratings(1) Operating Ratings(2) Supply Voltage (VIN) ............................................ 0V to VBIAS Bias Voltage (VBIAS) ................................................ 0V to 6V Enable Voltage (VEN)........................................... 0V to VBIAS Power Dissipation (PD) ........................... Internally Limited(3) Lead Temperature (soldering, 10 µsec.).................... 260°C Junction Temperature (TJ) ........................–40°C to +125°C Storage Temperature (Ts) .........................–65°C to +150°C ESD Rating(4) .................................................................. 2kV Supply Voltage (VIN)......................................... 1.7V to VBIAS Bias Voltage (VBIAS).......................................... 2.5V to 5.5V Enable Voltage (VEN)........................................... 0V to VBIAS Junction Temperature (TJ) ........................ –40°C to +125°C Junction Thermal Resistance 2x2 Thin MLF-6 (θJA) .........................................90°C/W Electrical Characteristics(5) VBIAS = 3.6V; VIN = VOUT + 1V; COUT = 1µF; IOUT = 100µA; TJ = 25°C, bold values indicate –40°C to +125°C, unless noted. Parameter Condition Min. Output Voltage Accuracy Variation from nominal VOUT –2.0 Reference Voltage ADJ pin voltage Max. Units +2.0 % 0.775 0.790 5 V VBIAS Line Regulation VBIAS = 3.6V to 5.5V; VIN = VOUT + 1V 0.03 0.6 % VIN Line Regulation VBIAS = 3.6V to 5.5V; VIN = VOUT + 1V to 5.5V 0.02 0.6 % Load Regulation IOUT = 100µA to 400mA 0.3 2 % VIN Dropout Voltage IOUT = 400mA 110 250 mV Ground Pin Current IOUT = 100µA to 400mA; VIN = VEN; VBIAS = 5.5V 35 55 µA Ground Pin Current in Shutdown VEN ≤ 0.2V 0.01 1 µA f = up to 1kHz; COUT = 1µF; no CBYP 60 dB Ripple Rejection f = up to 1kHz; COUT = 1µF; CBYP = 10nF 65 dB 40 dB 0.7595 f = 1kHz – 20kHz; COUT = 1µ F; CBYP = 10nF Current Limit VOUT = 0V Output Voltage Noise COUT = 1µF; CBYP = 10nF; 10Hz to 100kHz 50 450 Typ. 680 mA 30 µVRMS Enable Inputs (EN) Enable Input Voltage Enable Input Current Turn-On Time Logic Low 0.2 Logic High V V 1.2 VIL ≤ 0.2V 0.01 µA VIH ≥ 1V 0.02 µA COUT = 1µF; CBYP = 10nF 150 500 µs 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. 4. Devices are ESD sensitive. Handling precautions recommended. Human body model, 1.5kΩ in series with 100pF. 5. Specification for packaged product only. August 2010 3 M9999-080510-B Micrel, Inc. MIC5325 Typical Characteristics -120 Power Supply Rejection Ratio (V IN ) -100 -100 50mA 100µA (NO BYP) -80 -60 -120 100mA 100µA -80 VIN = VOUT +1V 300mA -20 VOUT = 1.2V COUT = 1µF CBYP = 0.01µF 0 0.1 1 10 100 FREQUENCY (kHz) 1,000 Ground Current (V IN ) vs. Output Current VIN = VOUT +1V -20 VOUT = 1.2V COUT = 1µF 400mA CBYP = 0.01µF 0 0.1 1 10 100 FREQUENCY (kHz) 18 7 6 12 5 4 8 50 100 150 200 250 300 350 400 OUTPUT CURRENT (mA) Output Voltage vs. V IN 2.0 100µA 1.8 VBIAS = 3.6V VIN = 2.8V VOUT = 1.8V COUT = 1µF CBYP = 0.01µF 2 140 50 100 150 200 250 300 350 400 OUTPUT CURRENT (mA) Dropout Voltage vs. Temperature 30 16 14 12 10 0 140 1.2 1.0 100 100 80 80 60 0.8 0.6 60 200mA 40 VBIAS = 5.5V VOUT = 1.8V COUT = 1µF 0 1 1.5 2 2.5 3 3.5 4 4.5 5 5.5 VIN (V) Ground Current (V IN ) vs. Temperature 16 14 12 10 8 100µA 400mA VBIAS = 3.6V VIN = 2.8V VOUT = 1.8V 0 -40 -20 0 20 40 60 80 100 120 TEMPERATURE (°C) August 2010 50 100 150 200 250 300 350 400 OUTPUT CURRENT (mA) Dropout Voltage vs. Output Current 400mA 400mA 0.4 0.2 Ground Current (Total) vs. Output Current 120 120 1.6 1.4 1 0 1.5 2 2.5 3 3.5 4 4.5 5 5.5 VIN (V) 22 20 18 4 0 0 VBIAS = 5.5V VOUT = 1.8V COUT = 1µF CBYP = 0.01µF 28 26 24 6 VIN = 2.8V VOUT = 1.8V COUT = 1µF CBYP = 0.01µF 2 1 4 2 Ground Current (V BIAS ) vs. Output Current 10 3 6 1,000 16 14 20 18 4 3 2 -40 8 0 0 6 5 100µA (NO BYP) 400mA 10 Ground Current (V IN ) vs. V IN 9 8 7 100µA -60 -40 10 9 Power Supply Rejection Ratio (V BIAS ) 40 100mA 20 0 -40 -20 0 20 40 60 80 100 120 TEMPERATURE (°C) Current Limit vs. V IN 900 875 850 825 800 775 750 725 700 VBIAS = 5.5V 675 VOUT = 1.8V 650 COUT = 1µF 625 CIN = 1µF 600 1.5 2 2.5 3 3.5 4 4.5 5 5.5 VIN (V) 4 20 0 0 1.8 VBIAS = 3.6V VIN = 2.8V COUT = 1µF CBYP = 0.01µF CBAIS = 1µF CIN = 1µF 50 100 150 200 250 300 350 400 OUTPUT CURRENT (mA) Output Voltage vs. Output Current 1.75 1.7 1.65 1.6 0 VBIAS = 3.6V VIN = 2.8V COUT = 1µF CBYP = 0.01µF CIN = 1µF 50 100 150 200 250 300 350 400 OUTPUT CURRENT (mA) M9999-080510-B Micrel, Inc. MIC5325 Typical Characteristics (Continued) 1.30 Output Voltage vs. Temperature 0.900 Reference Voltage vs. Temperature VIN = 2.2V VBIAS = 3.6V VOUT = 1.2V COUT = 1µF IOUT = 100µA 0.875 0.850 1.25 0.825 0.800 1.20 VIN = 2.2V VBIAS = 3.6V VOUT = 1.2V COUT = 1µF I OUT = 100µA 1.15 1.10 -40 -20 0 20 40 60 80 100 120 TEMPERATURE (°C) 10 20 18 0.775 400mA 16 14 12 10 8 6 0.750 Bias Current vs. Enable Voltage 100µA VBIAS = 3.6V VIN = 2.8V VOUT = 1.8V CIN = 1µF COUT = 1µF CBYP = 0.01µF 0.725 4 2 0.700 -40 -20 0 20 40 60 80 100 120 TEMPERATURE (°C) 0 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 5.5 ENABLE VOLTAGE (V) Output Noise Spectral Density VIN = 4.5V VOUT = 1.8V COUT = 1µF CBYP = 0.01µF 1 0.1 0.01 10 Noise (10Hz to 1MHz) = 59µVRMS 100 1K 10K 100K FREQUENCY (Hz) August 2010 1M 5 M9999-080510-B Micrel, Inc. MIC5325 Functional Characteristics August 2010 6 M9999-080510-B Micrel, Inc. MIC5325 Functional Diagram CURRENT LIMIT VBIAS VIN VOUT LDO EN QUICK START REFERENCE BYP THERMAL LIMIT GND August 2010 7 M9999-080510-B Micrel, Inc. MIC5325 Bypass Capacitor A capacitor can be placed from the noise bypass pin-toground to reduce output voltage noise. The capacitor bypasses the internal reference. A 0.01µF capacitor is recommended for applications that require low-noise outputs. The bypass capacitor can be increased, further reducing noise and improving PSRR. Turn-on time increases slightly with respect to bypass capacitance. A unique, quick-start circuit allows the MIC5325 to drive a large capacitor on the bypass pin without significantly slowing turn-on time. Application Information The MIC5325 is a high performance, low-dropout linear regulator designed for low current applications requiring fast transient response. The MIC5325 utilizes two input supplies, significantly reducing dropout voltage, perfect for low-voltage, DC-to-DC conversion. The MIC5325 requires a minimum of external components. The MIC5325 regulator is fully protected from damage due to fault conditions, offering linear current limiting and thermal shutdown. Bias Supply Voltage VBIAS, requiring relatively light current, provides power to the control portion of the MIC5325. Bypassing on the bias pin is recommended to improve performance of the regulator during line and load transients. 1µF ceramic capacitor from VBIAS-to-ground helps reduce high frequency noise from being injected into the control circuitry from the bias rail and is good design practice. Minimum Load Current The MIC5325, unlike most other regulators, does not require a minimum load to maintain output voltage regulation. Enable/Shutdown The MIC5325 comes with a single 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. The active-high enable pin uses CMOS technology and the enable pin cannot be left floating; a floating enable pin may cause an indeterminate state on the output. Input Supply Voltage VIN provides the supply to power the LDO. The minimum input voltage is 1.7V, allowing conversion from low voltage supplies. Output Capacitor The MIC5325 requires an output capacitor of 1µF or greater to maintain stability. The design is optimized for use with low-ESR ceramic chip capacitors. High ESR capacitors may cause high frequency oscillation. The output capacitor can be increased, but performance has been optimized for a 1µF ceramic output capacitor and does not improve significantly with larger capacitance. X7R/X5R dielectric-type ceramic capacitors are recommended because of their temperature performance. X7Rtype 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 an X7R ceramic capacitor to ensure the same minimum capacitance over the equivalent operating temperature range. Thermal Considerations The MIC5325 is designed to provide 400mA 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 1.8V, the output voltage is 1.2V and the output current = 400mA. The actual power dissipation of the regulator circuit can be determined using the equation: PD = (VIN – VOUT1) I OUT + VIN IGND Because this device is CMOS and the ground current is typically <100µA over the load range, the power dissipation contributed by the ground current is < 1% and can be ignored for this calculation. PD = (1.8V – 1.2V) × 400mA PD = 0.18W 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: Input Capacitor The MIC5325 is a high-performance, high bandwidth device. Therefore, it requires a well-bypassed input supply for optimal performance. A 1µF capacitor is required from the input-to-ground to provide stability. LowESR ceramic capacitors provide optimal performance at a minimum of space. Additional high-frequency capacitors, such as small-valued NPO dielectric-type capacitors, help filter out high-frequency noise and are good practice in any RF-based circuit. August 2010 ⎛ TJ(max) − TA PD(max) = ⎜⎜ θ JA ⎝ ⎞ ⎟ ⎟ ⎠ TJ(max) = 125°C, the maximum junction temperature of the die θJA thermal resistance = 90°C/W. 8 M9999-080510-B Micrel, Inc. MIC5325 R3 10k J1 VBIAS U1 MIC5325-YMT VBIAS C1 1µF/6.3V J2 GND J3 VIN C3 GND VIN J6 EN EN VBIAS BYP/ADJ C2 1µF/6.3V 0.01µF/6.3V VOUT VIN VOUT C4 1µF/6.3V J4 VO J5 GND Bill of Materials Item Part Number Manufacturer (1) Description Qty. C1, C2, C4 VJ0603G105KXYCW1BC Vishay Capacitor, 1µF, 6.3V, Size 0603 3 C3 VJ0603Y103KXQCW1BC Murata(2) Capacitor, 0.01µF, 10V, Size 0603 1 R3 CRCW060310K0FKEA Resistor, 10k, 1%, 1/16W, Size 0603 1 400mA ULDO™ with Ultra-Low IQ 1 U1 MIC5325-xxYMT Vishay Dale(1) Micrel, Inc. (3) Notes: 1. Vishay: www.vishay.com. 2. Murata: www.murata.com. 3. Micrel, Inc.: www.micrel.com. August 2010 9 M9999-080510-B Micrel, Inc. MIC5325 PCB Layout Recommendations Top Layer Bottom Layer August 2010 10 M9999-080510-B Micrel, Inc. MIC5325 Package Information 6-Pin 2mm x 2mm Thin MLF® (MT) 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. © 2007 Micrel, Incorporated. August 2010 11 M9999-080510-B